Adjust llvm-project main llvmorg-21-init-19288-gface93e724f4, part 3

This adjusts the llvmorg-21-init-19288-gface93e724f4 import: add more
items to the libc/ top-level directory.

PR:		292067
MFC after:	1 month

611 files changed, 170014 insertions, 0 deletions

diff --git a/contrib/llvm-project/libc/hdr/errno_macros.h b/contrib/llvm-project/libc/hdr/errno_macros.h
new file mode 100644
index 000000000000..27ea49977d8c
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/errno_macros.h
@@ -0,0 +1,28 @@
+//===-- Definition of macros from errno.h ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_ERRNO_MACROS_H
+#define LLVM_LIBC_HDR_ERRNO_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#ifdef __linux__
+#include <linux/errno.h>
+
+#include "include/llvm-libc-macros/error-number-macros.h"
+#else // __linux__
+#include "include/llvm-libc-macros/generic-error-number-macros.h"
+#endif
+
+#else // Overlay mode
+
+#include <errno.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_ERRNO_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/fcntl_macros.h b/contrib/llvm-project/libc/hdr/fcntl_macros.h
new file mode 100644
index 000000000000..3a1ddeb0a2da
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/fcntl_macros.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from fcntl/fcntl.h ---------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_FCNTL_MACROS_H
+#define LLVM_LIBC_HDR_FCNTL_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/fcntl-macros.h"
+
+#else // Overlay mode
+
+#include "hdr/fcntl_overlay.h"
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_FCNTL_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/fcntl_overlay.h b/contrib/llvm-project/libc/hdr/fcntl_overlay.h
new file mode 100644
index 000000000000..17ae78b3d0ec
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/fcntl_overlay.h
@@ -0,0 +1,47 @@
+//===-- Including fcntl.h in overlay mode ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_FCNTL_OVERLAY_H
+#define LLVM_LIBC_HDR_FCNTL_OVERLAY_H
+
+#ifdef LIBC_FULL_BUILD
+#error "This header should only be included in overlay mode"
+#endif
+
+// Overlay mode
+
+// glibc <fcntl.h> header might provide extern inline definitions for few
+// functions, causing external alias errors.  They are guarded by
+// `__USE_FORTIFY_LEVEL`, which will be temporarily disabled
+// with `_FORTIFY_SOURCE`.
+
+#ifdef _FORTIFY_SOURCE
+#define LIBC_OLD_FORTIFY_SOURCE _FORTIFY_SOURCE
+#undef _FORTIFY_SOURCE
+#endif
+
+#ifdef __USE_FORTIFY_LEVEL
+#define LIBC_OLD_USE_FORTIFY_LEVEL __USE_FORTIFY_LEVEL
+#undef __USE_FORTIFY_LEVEL
+#define __USE_FORTIFY_LEVEL 0
+#endif
+
+#include <fcntl.h>
+
+#ifdef LIBC_OLD_FORTIFY_SOURCE
+#define _FORTIFY_SOURCE LIBC_OLD_FORTIFY_SOURCE
+#undef LIBC_OLD_FORTIFY_SOURCE
+#endif
+
+#ifdef LIBC_OLD_USE_FORTIFY_LEVEL
+#undef __USE_FORTIFY_LEVEL
+#define __USE_FORTIFY_LEVEL LIBC_OLD_USE_FORTIFY_LEVEL
+#undef LIBC_OLD_USE_FORTIFY_LEVEL
+#endif
+
+#endif // LLVM_LIBC_HDR_FCNTL_OVERLAY_H
diff --git a/contrib/llvm-project/libc/hdr/fenv_macros.h b/contrib/llvm-project/libc/hdr/fenv_macros.h
new file mode 100644
index 000000000000..3f0bd89a6ea3
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/fenv_macros.h
@@ -0,0 +1,61 @@
+//===-- Definition of macros from fenv.h ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_FENV_MACROS_H
+#define LLVM_LIBC_HDR_FENV_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/fenv-macros.h"
+
+#else // Overlay mode
+
+#include <fenv.h>
+
+// In some environment, FE_ALL_EXCEPT is set to 0 and the remaining exceptions
+// FE_* are missing.
+#ifndef FE_DIVBYZERO
+#define FE_DIVBYZERO 0
+#endif // FE_DIVBYZERO
+
+#ifndef FE_INEXACT
+#define FE_INEXACT 0
+#endif // FE_INEXACT
+
+#ifndef FE_INVALID
+#define FE_INVALID 0
+#endif // FE_INVALID
+
+#ifndef FE_OVERFLOW
+#define FE_OVERFLOW 0
+#endif // FE_OVERFLOW
+
+#ifndef FE_UNDERFLOW
+#define FE_UNDERFLOW 0
+#endif // FE_UNDERFLOW
+
+// Rounding mode macros might be missing.
+#ifndef FE_DOWNWARD
+#define FE_DOWNWARD 0x400
+#endif // FE_DOWNWARD
+
+#ifndef FE_TONEAREST
+#define FE_TONEAREST 0
+#endif // FE_TONEAREST
+
+#ifndef FE_TOWARDZERO
+#define FE_TOWARDZERO 0xC00
+#endif // FE_TOWARDZERO
+
+#ifndef FE_UPWARD
+#define FE_UPWARD 0x800
+#endif // FE_UPWARD
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_FENV_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/float_macros.h b/contrib/llvm-project/libc/hdr/float_macros.h
new file mode 100644
index 000000000000..a0ef5e29b986
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/float_macros.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from math.h ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_FLOAT_MACROS_H
+#define LLVM_LIBC_HDR_FLOAT_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/float-macros.h"
+
+#else // Overlay mode
+
+#include <float.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_FLOAT_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/func/aligned_alloc.h b/contrib/llvm-project/libc/hdr/func/aligned_alloc.h
new file mode 100644
index 000000000000..b3436dfee1f2
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/func/aligned_alloc.h
@@ -0,0 +1,22 @@
+//===-- Definition of the aligned_alloc.h proxy ---------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_FUNC_ALIGNED_ALLOC_H
+#define LLVM_LIBC_HDR_FUNC_ALIGNED_ALLOC_H
+
+#ifdef LIBC_FULL_BUILD
+#include "hdr/types/size_t.h"
+extern "C" void *aligned_alloc(size_t, size_t);
+
+#else // Overlay mode
+
+#include "hdr/stdlib_overlay.h"
+
+#endif
+
+#endif
diff --git a/contrib/llvm-project/libc/hdr/func/free.h b/contrib/llvm-project/libc/hdr/func/free.h
new file mode 100644
index 000000000000..316556b21e3b
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/func/free.h
@@ -0,0 +1,22 @@
+//===-- Definition of the free.h proxy ------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_FUNC_FREE_H
+#define LLVM_LIBC_HDR_FUNC_FREE_H
+
+#ifdef LIBC_FULL_BUILD
+
+extern "C" void free(void *) noexcept;
+
+#else // Overlay mode
+
+#include "hdr/stdlib_overlay.h"
+
+#endif
+
+#endif
diff --git a/contrib/llvm-project/libc/hdr/func/malloc.h b/contrib/llvm-project/libc/hdr/func/malloc.h
new file mode 100644
index 000000000000..8281021f7996
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/func/malloc.h
@@ -0,0 +1,24 @@
+//===-- Definition of the malloc.h proxy ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_FUNC_MALLOC_H
+#define LLVM_LIBC_HDR_FUNC_MALLOC_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "hdr/types/size_t.h"
+
+extern "C" void *malloc(size_t) noexcept;
+
+#else // Overlay mode
+
+#include "hdr/stdlib_overlay.h"
+
+#endif
+
+#endif
diff --git a/contrib/llvm-project/libc/hdr/func/realloc.h b/contrib/llvm-project/libc/hdr/func/realloc.h
new file mode 100644
index 000000000000..ecb29541fe34
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/func/realloc.h
@@ -0,0 +1,24 @@
+//===-- Definition of the realloc.h proxy ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_FUNC_REALLOC_H
+#define LLVM_LIBC_HDR_FUNC_REALLOC_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "hdr/types/size_t.h"
+
+extern "C" void *realloc(void *ptr, size_t new_size) noexcept;
+
+#else // Overlay mode
+
+#include "hdr/stdlib_overlay.h"
+
+#endif
+
+#endif
diff --git a/contrib/llvm-project/libc/hdr/limits_macros.h b/contrib/llvm-project/libc/hdr/limits_macros.h
new file mode 100644
index 000000000000..2dc13b0cca60
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/limits_macros.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from limits.h --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_LIMITS_MACROS_H
+#define LLVM_LIBC_HDR_LIMITS_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/limits-macros.h"
+
+#else // Overlay mode
+
+#include <limits.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_LIMITS_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/link_macros.h b/contrib/llvm-project/libc/hdr/link_macros.h
new file mode 100644
index 000000000000..8a78a864e6ce
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/link_macros.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from link.h ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_LINK_MACROS_H
+#define LLVM_LIBC_HDR_LINK_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/link-macros.h"
+
+#else // Overlay mode
+
+#include <link.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_LINK_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/locale_macros.h b/contrib/llvm-project/libc/hdr/locale_macros.h
new file mode 100644
index 000000000000..7d94f6ddabe4
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/locale_macros.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from locale.h --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_LOCALE_MACROS_H
+#define LLVM_LIBC_HDR_LOCALE_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/locale-macros.h"
+
+#else // Overlay mode
+
+#error "macros not available in overlay mode"
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_LOCALE_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/math_function_macros.h b/contrib/llvm-project/libc/hdr/math_function_macros.h
new file mode 100644
index 000000000000..48dec8260ef8
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/math_function_macros.h
@@ -0,0 +1,27 @@
+//===-- Definition of macros from math.h ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_MATH_FUNCTION_MACROS_H
+#define LLVM_LIBC_HDR_MATH_FUNCTION_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/math-function-macros.h"
+
+#else // Overlay mode
+
+// GCC will include CXX headers when __cplusplus is defined. This behavior
+// can be suppressed by defining _GLIBCXX_INCLUDE_NEXT_C_HEADERS.
+#if defined(__GNUC__) && !defined(__clang__)
+#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+#endif
+#include <math.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_MATH_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/math_macros.h b/contrib/llvm-project/libc/hdr/math_macros.h
new file mode 100644
index 000000000000..863451123f3f
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/math_macros.h
@@ -0,0 +1,48 @@
+//===-- Definition of macros from math.h ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_MATH_MACROS_H
+#define LLVM_LIBC_HDR_MATH_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/math-macros.h"
+
+#else // Overlay mode
+
+// GCC will include CXX headers when __cplusplus is defined. This behavior
+// can be suppressed by defining _GLIBCXX_INCLUDE_NEXT_C_HEADERS.
+#if defined(__GNUC__) && !defined(__clang__)
+#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+#endif
+#include <math.h>
+
+// Some older math.h header does not have FP_INT_* constants yet.
+#ifndef FP_INT_UPWARD
+#define FP_INT_UPWARD 0
+#endif // FP_INT_UPWARD
+
+#ifndef FP_INT_DOWNWARD
+#define FP_INT_DOWNWARD 1
+#endif // FP_INT_DOWNWARD
+
+#ifndef FP_INT_TOWARDZERO
+#define FP_INT_TOWARDZERO 2
+#endif // FP_INT_TOWARDZERO
+
+#ifndef FP_INT_TONEARESTFROMZERO
+#define FP_INT_TONEARESTFROMZERO 3
+#endif // FP_INT_TONEARESTFROMZERO
+
+#ifndef FP_INT_TONEAREST
+#define FP_INT_TONEAREST 4
+#endif // FP_INT_TONEAREST
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_MATH_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/offsetof_macros.h b/contrib/llvm-project/libc/hdr/offsetof_macros.h
new file mode 100644
index 000000000000..42e853ffa92e
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/offsetof_macros.h
@@ -0,0 +1,23 @@
+//===-- Definition of macros for offsetof ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_OFFSETOF_MACROS_H
+#define LLVM_LIBC_HDR_OFFSETOF_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/offsetof-macro.h"
+
+#else // Overlay mode
+
+#define __need_offsetof
+#include <stddef.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_OFFSETOF_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/sched_macros.h b/contrib/llvm-project/libc/hdr/sched_macros.h
new file mode 100644
index 000000000000..cfeaa9979678
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/sched_macros.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from sched.h ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_SCHED_MACROS_H
+#define LLVM_LIBC_HDR_SCHED_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/sched-macros.h"
+
+#else // Overlay mode
+
+#include <sched.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_SCHED_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/signal_macros.h b/contrib/llvm-project/libc/hdr/signal_macros.h
new file mode 100644
index 000000000000..867d17a4ca8c
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/signal_macros.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from signal.h --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_SIGNAL_MACROS_H
+#define LLVM_LIBC_HDR_SIGNAL_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/signal-macros.h"
+
+#else // Overlay mode
+
+#include <signal.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_SIGNAL_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/stdio_macros.h b/contrib/llvm-project/libc/hdr/stdio_macros.h
new file mode 100644
index 000000000000..a4d6a972ec9a
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/stdio_macros.h
@@ -0,0 +1,23 @@
+//===-- Definition of macros from stdio.h --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_STDIO_MACROS_H
+#define LLVM_LIBC_HDR_STDIO_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/file-seek-macros.h"
+#include "include/llvm-libc-macros/stdio-macros.h"
+
+#else // Overlay mode
+
+#include "stdio_overlay.h"
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_STDIO_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/stdio_overlay.h b/contrib/llvm-project/libc/hdr/stdio_overlay.h
new file mode 100644
index 000000000000..aef8c448fe49
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/stdio_overlay.h
@@ -0,0 +1,69 @@
+//===-- Including stdio.h in overlay mode ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_STDIO_OVERLAY_H
+#define LLVM_LIBC_HDR_STDIO_OVERLAY_H
+
+#ifdef LIBC_FULL_BUILD
+#error "This header should only be included in overlay mode"
+#endif
+
+// Overlay mode
+
+// glibc <stdio.h> header might provide extern inline definitions for few
+// functions, causing external alias errors.  They are guarded by
+// `__USE_EXTERN_INLINES` macro.  We temporarily disable `__USE_EXTERN_INLINES`
+// macro by defining `__NO_INLINE__` before including <stdio.h>.
+// And the same with `__USE_FORTIFY_LEVEL`, which will be temporarily disabled
+// with `_FORTIFY_SOURCE`.
+
+#ifdef _FORTIFY_SOURCE
+#define LIBC_OLD_FORTIFY_SOURCE _FORTIFY_SOURCE
+#undef _FORTIFY_SOURCE
+#endif
+
+#ifdef __USE_EXTERN_INLINES
+#define LIBC_OLD_USE_EXTERN_INLINES
+#undef __USE_EXTERN_INLINES
+#endif
+
+#ifdef __USE_FORTIFY_LEVEL
+#define LIBC_OLD_USE_FORTIFY_LEVEL __USE_FORTIFY_LEVEL
+#undef __USE_FORTIFY_LEVEL
+#define __USE_FORTIFY_LEVEL 0
+#endif
+
+#ifndef __NO_INLINE__
+#define __NO_INLINE__ 1
+#define LIBC_SET_NO_INLINE
+#endif
+
+#include <stdio.h>
+
+#ifdef LIBC_OLD_FORTIFY_SOURCE
+#define _FORTIFY_SOURCE LIBC_OLD_FORTIFY_SOURCE
+#undef LIBC_OLD_FORTIFY_SOURCE
+#endif
+
+#ifdef LIBC_SET_NO_INLINE
+#undef __NO_INLINE__
+#undef LIBC_SET_NO_INLINE
+#endif
+
+#ifdef LIBC_OLD_USE_FORTIFY_LEVEL
+#undef __USE_FORTIFY_LEVEL
+#define __USE_FORTIFY_LEVEL LIBC_OLD_USE_FORTIFY_LEVEL
+#undef LIBC_OLD_USE_FORTIFY_LEVEL
+#endif
+
+#ifdef LIBC_OLD_USE_EXTERN_INLINES
+#define __USE_EXTERN_INLINES
+#undef LIBC_OLD_USE_EXTERN_INLINES
+#endif
+
+#endif // LLVM_LIBC_HDR_STDIO_OVERLAY_H
diff --git a/contrib/llvm-project/libc/hdr/stdlib_macros.h b/contrib/llvm-project/libc/hdr/stdlib_macros.h
new file mode 100644
index 000000000000..3faeb3a8fe36
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/stdlib_macros.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from stdlib.h --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_STDLIB_MACROS_H
+#define LLVM_LIBC_HDR_STDLIB_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/stdlib-macros.h"
+
+#else // Overlay mode
+
+#include "stdlib_overlay.h"
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_STDLIB_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/stdlib_overlay.h b/contrib/llvm-project/libc/hdr/stdlib_overlay.h
new file mode 100644
index 000000000000..53c32ec0ae33
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/stdlib_overlay.h
@@ -0,0 +1,46 @@
+//===-- Including stdlib.h in overlay mode --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_STDLIB_OVERLAY_H
+#define LLVM_LIBC_HDR_STDLIB_OVERLAY_H
+
+#ifdef LIBC_FULL_BUILD
+#error "This header should only be included in overlay mode"
+#endif
+
+// Overlay mode
+
+// glibc <stdlib.h> header might provide extern inline definitions for few
+// functions, causing external alias errors.  They are guarded by
+// `__USE_FORTIFY_LEVEL`, which will be temporarily disabled.
+
+#ifdef _FORTIFY_SOURCE
+#define LIBC_OLD_FORTIFY_SOURCE _FORTIFY_SOURCE
+#undef _FORTIFY_SOURCE
+#endif
+
+#ifdef __USE_FORTIFY_LEVEL
+#define LIBC_OLD_USE_FORTIFY_LEVEL __USE_FORTIFY_LEVEL
+#undef __USE_FORTIFY_LEVEL
+#define __USE_FORTIFY_LEVEL 0
+#endif
+
+#include <stdlib.h>
+
+#ifdef LIBC_OLD_FORTIFY_SOURCE
+#define _FORTIFY_SOURCE LIBC_OLD_FORTIFY_SOURCE
+#undef LIBC_OLD_FORTIFY_SOURCE
+#endif
+
+#ifdef LIBC_OLD_USE_FORTIFY_LEVEL
+#undef __USE_FORTIFY_LEVEL
+#define __USE_FORTIFY_LEVEL LIBC_OLD_USE_FORTIFY_LEVEL
+#undef LIBC_OLD_USE_FORTIFY_LEVEL
+#endif
+
+#endif
diff --git a/contrib/llvm-project/libc/hdr/sys_auxv_macros.h b/contrib/llvm-project/libc/hdr/sys_auxv_macros.h
new file mode 100644
index 000000000000..c04011baedb8
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/sys_auxv_macros.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from sys/auxv.h ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_SYS_AUXV_MACROS_H
+#define LLVM_LIBC_HDR_SYS_AUXV_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/sys-auxv-macros.h"
+
+#else // Overlay mode
+
+#include <sys/auxv.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_SYS_AUXV_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/sys_epoll_macros.h b/contrib/llvm-project/libc/hdr/sys_epoll_macros.h
new file mode 100644
index 000000000000..db047f161634
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/sys_epoll_macros.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from sys/epoll.h -----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_SYS_EPOLL_MACROS_H
+#define LLVM_LIBC_HDR_SYS_EPOLL_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/sys-epoll-macros.h"
+
+#else // Overlay mode
+
+#include <sys/epoll.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_SYS/EPOLL_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/sys_ioctl_macros.h b/contrib/llvm-project/libc/hdr/sys_ioctl_macros.h
new file mode 100644
index 000000000000..935d43627346
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/sys_ioctl_macros.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from sys/ioctl.h -----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_SYS_IOCTL_MACROS_H
+#define LLVM_LIBC_HDR_SYS_IOCTL_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/sys-ioctl-macros.h"
+
+#else // Overlay mode
+
+#include <sys/ioctl.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_SYS_IOCTL_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/sys_stat_macros.h b/contrib/llvm-project/libc/hdr/sys_stat_macros.h
new file mode 100644
index 000000000000..cb58d62e1ffb
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/sys_stat_macros.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from sys/stat.h ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_SYS_STAT_MACROS_H
+#define LLVM_LIBC_HDR_SYS_STAT_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/sys-stat-macros.h"
+
+#else // Overlay mode
+
+#include <sys/stat.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_SYS_STAT_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/time_macros.h b/contrib/llvm-project/libc/hdr/time_macros.h
new file mode 100644
index 000000000000..4488a24848c3
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/time_macros.h
@@ -0,0 +1,28 @@
+//===-- Definition of macros from time.h ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TIME_MACROS_H
+#define LLVM_LIBC_HDR_TIME_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/time-macros.h"
+
+#else // Overlay mode
+
+#include <time.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+// TODO: For now, on windows, let's always include the extension header.
+// We will need to decide how to export this header.
+#ifdef _WIN32
+#include "include/llvm-libc-macros/windows/time-macros-ext.h"
+#endif // _WIN32
+
+#endif // LLVM_LIBC_HDR_TIME_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/types/ACTION.h b/contrib/llvm-project/libc/hdr/types/ACTION.h
new file mode 100644
index 000000000000..0b63521dff64
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/ACTION.h
@@ -0,0 +1,22 @@
+//===-- Proxy header for ACTION -------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_ACTION_H
+#define LLVM_LIBC_HDR_TYPES_ACTION_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/ACTION.h"
+
+#else // Overlay mode
+
+#include <search.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_ACTION_H
diff --git a/contrib/llvm-project/libc/hdr/types/ENTRY.h b/contrib/llvm-project/libc/hdr/types/ENTRY.h
new file mode 100644
index 000000000000..5f4aee4b30fe
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/ENTRY.h
@@ -0,0 +1,22 @@
+//===-- Proxy header for ENTRY --------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_ENTRY_H
+#define LLVM_LIBC_HDR_TYPES_ENTRY_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/ENTRY.h"
+
+#else // Overlay mode
+
+#include <search.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_ENTRY_H
diff --git a/contrib/llvm-project/libc/hdr/types/FILE.h b/contrib/llvm-project/libc/hdr/types/FILE.h
new file mode 100644
index 000000000000..ecb52b7102cb
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/FILE.h
@@ -0,0 +1,22 @@
+//===-- Proxy for FILE ----------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_FILE_H
+#define LLVM_LIBC_HDR_TYPES_FILE_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/FILE.h"
+
+#else // Overlay mode
+
+#include "hdr/stdio_overlay.h"
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_FILE_H
diff --git a/contrib/llvm-project/libc/hdr/types/atexithandler_t.h b/contrib/llvm-project/libc/hdr/types/atexithandler_t.h
new file mode 100644
index 000000000000..6d829fe60d27
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/atexithandler_t.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from atexithandler_t.h -----------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_ATEXITHANDLER_T_H
+#define LLVM_LIBC_HDR_TYPES_ATEXITHANDLER_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/__atexithandler_t.h"
+
+#else // overlay mode
+
+#error // type not available in overlay mode
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_ATEXITHANDLER_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/char32_t.h b/contrib/llvm-project/libc/hdr/types/char32_t.h
new file mode 100644
index 000000000000..94fe5747d341
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/char32_t.h
@@ -0,0 +1,22 @@
+//===-- Definition of char32_t.h ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_CHAR32_T_H
+#define LLVM_LIBC_HDR_TYPES_CHAR32_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/char32_t.h"
+
+#else // overlay mode
+
+#include "hdr/uchar_overlay.h"
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_CHAR32_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/char8_t.h b/contrib/llvm-project/libc/hdr/types/char8_t.h
new file mode 100644
index 000000000000..4d71e3dd8909
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/char8_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of char8_t.h -------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_CHAR8_T_H
+#define LLVM_LIBC_HDR_TYPES_CHAR8_T_H
+
+#include "include/llvm-libc-types/char8_t.h"
+
+#endif // LLVM_LIBC_HDR_TYPES_CHAR8_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/clock_t.h b/contrib/llvm-project/libc/hdr/types/clock_t.h
new file mode 100644
index 000000000000..b0b658e96c3d
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/clock_t.h
@@ -0,0 +1,22 @@
+//===-- Proxy for clock_t -------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_CLOCK_T_H
+#define LLVM_LIBC_HDR_TYPES_CLOCK_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/clock_t.h"
+
+#else // Overlay mode
+
+#include <sys/types.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_CLOCK_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/clockid_t.h b/contrib/llvm-project/libc/hdr/types/clockid_t.h
new file mode 100644
index 000000000000..729e580aba43
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/clockid_t.h
@@ -0,0 +1,23 @@
+//===-- Proxy for clockid_t -----------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_CLOCKID_T_H
+#define LLVM_LIBC_HDR_TYPES_CLOCKID_T_H
+
+// TODO: we will need to decide how to export extension to windows.
+#if defined(LIBC_FULL_BUILD) || defined(_WIN32)
+
+#include "include/llvm-libc-types/clockid_t.h"
+
+#else // Overlay mode
+
+#include <sys/types.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_CLOCKID_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/cookie_io_functions_t.h b/contrib/llvm-project/libc/hdr/types/cookie_io_functions_t.h
new file mode 100644
index 000000000000..7323a05001c4
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/cookie_io_functions_t.h
@@ -0,0 +1,22 @@
+//===-- Proxy for cookie_io_functions_t -----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_COOKIE_IO_FUNCTIONS_T_H
+#define LLVM_LIBC_HDR_TYPES_COOKIE_IO_FUNCTIONS_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/cookie_io_functions_t.h"
+
+#else // Overlay mode
+
+#include "hdr/stdio_overlay.h"
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_COOKIE_IO_FUNCTIONS_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/cpu_set_t.h b/contrib/llvm-project/libc/hdr/types/cpu_set_t.h
new file mode 100644
index 000000000000..26aed7592fa2
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/cpu_set_t.h
@@ -0,0 +1,22 @@
+//===-- Proxy for cpu_set_t -----------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_CPU_SET_T_H
+#define LLVM_LIBC_HDR_TYPES_CPU_SET_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/cpu_set_t.h"
+
+#else // Overlay mode
+
+#include <sched.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_CPU_SET_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/div_t.h b/contrib/llvm-project/libc/hdr/types/div_t.h
new file mode 100644
index 000000000000..29c355f079e1
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/div_t.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from div_t.h ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_DIV_T_H
+#define LLVM_LIBC_HDR_TYPES_DIV_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/div_t.h"
+
+#else // Overlay mode
+
+#include "hdr/stdlib_overlay.h"
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_DIV_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/fenv_t.h b/contrib/llvm-project/libc/hdr/types/fenv_t.h
new file mode 100644
index 000000000000..ddfb08c027bf
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/fenv_t.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from fenv_t.h --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_FENV_T_H
+#define LLVM_LIBC_HDR_TYPES_FENV_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/fenv_t.h"
+
+#else // Overlay mode
+
+#include <fenv.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_FENV_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/fexcept_t.h b/contrib/llvm-project/libc/hdr/types/fexcept_t.h
new file mode 100644
index 000000000000..761f125ae8cf
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/fexcept_t.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from fexcept_t.h -----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_FEXCEPT_T_H
+#define LLVM_LIBC_HDR_TYPES_FEXCEPT_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/fexcept_t.h"
+
+#else // Overlay mode
+
+#include <fenv.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_FEXCEPT_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/jmp_buf.h b/contrib/llvm-project/libc/hdr/types/jmp_buf.h
new file mode 100644
index 000000000000..3fa1de816d70
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/jmp_buf.h
@@ -0,0 +1,22 @@
+//===-- Definition of jmp_buf.h ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apahce License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_JMP_BUF_H
+#define LLVM_LIBC_HDR_TYPES_JMP_BUF_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/jmp_buf.h"
+
+#else // overlay mode
+
+#include <setjmp.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_JMP_BUF_H
diff --git a/contrib/llvm-project/libc/hdr/types/ldiv_t.h b/contrib/llvm-project/libc/hdr/types/ldiv_t.h
new file mode 100644
index 000000000000..c7023f5077bd
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/ldiv_t.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from ldiv_t.h --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_LDIV_T_H
+#define LLVM_LIBC_HDR_TYPES_LDIV_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/ldiv_t.h"
+
+#else // Overlay mode
+
+#include "hdr/stdlib_overlay.h"
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_LDIV_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/lldiv_t.h b/contrib/llvm-project/libc/hdr/types/lldiv_t.h
new file mode 100644
index 000000000000..cd41886674a1
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/lldiv_t.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from lldiv_t.h -------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_LLDIV_T_H
+#define LLVM_LIBC_HDR_TYPES_LLDIV_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/lldiv_t.h"
+
+#else // Overlay mode
+
+#include "hdr/stdlib_overlay.h"
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_LLDIV_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/locale_t.h b/contrib/llvm-project/libc/hdr/types/locale_t.h
new file mode 100644
index 000000000000..be12d12b4070
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/locale_t.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from locale_t.h ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_LOCALE_T_H
+#define LLVM_LIBC_HDR_TYPES_LOCALE_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/locale_t.h"
+
+#else // overlay mode
+
+#error "type not available in overlay mode"
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_LOCALE_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/mbstate_t.h b/contrib/llvm-project/libc/hdr/types/mbstate_t.h
new file mode 100644
index 000000000000..d8fadceaaac8
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/mbstate_t.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from mbstate_t.h -----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_MBSTATE_T_H
+#define LLVM_LIBC_HDR_TYPES_MBSTATE_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/mbstate_t.h"
+
+#else // Overlay mode
+
+#error "Cannot overlay mbstate_t"
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_MBSTATE_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/mode_t.h b/contrib/llvm-project/libc/hdr/types/mode_t.h
new file mode 100644
index 000000000000..3f36a1961e62
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/mode_t.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from mode_t.h --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_MODE_T_H
+#define LLVM_LIBC_HDR_TYPES_MODE_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/mode_t.h"
+
+#else // Overlay mode
+
+#include "hdr/fcntl_overlay.h"
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_MODE_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/nfds_t.h b/contrib/llvm-project/libc/hdr/types/nfds_t.h
new file mode 100644
index 000000000000..9143564c2333
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/nfds_t.h
@@ -0,0 +1,23 @@
+//===-- Definition of nfds_t ----------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_NFDS_T_H
+#define LLVM_LIBC_HDR_TYPES_NFDS_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/nfds_t.h"
+
+#else // overlay mode
+
+#include <poll.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_NFDS_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/off_t.h b/contrib/llvm-project/libc/hdr/types/off_t.h
new file mode 100644
index 000000000000..52337e5b63e2
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/off_t.h
@@ -0,0 +1,22 @@
+//===-- Proxy for off_t ---------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_OFF_T_H
+#define LLVM_LIBC_HDR_TYPES_OFF_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/off_t.h"
+
+#else // Overlay mode
+
+#include "hdr/stdio_overlay.h"
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_OFF_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/pid_t.h b/contrib/llvm-project/libc/hdr/types/pid_t.h
new file mode 100644
index 000000000000..34306fc4118c
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/pid_t.h
@@ -0,0 +1,22 @@
+//===-- Proxy for pid_t ---------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_PID_T_H
+#define LLVM_LIBC_HDR_TYPES_PID_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/pid_t.h"
+
+#else // Overlay mode
+
+#include <sys/types.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_PID_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/sigset_t.h b/contrib/llvm-project/libc/hdr/types/sigset_t.h
new file mode 100644
index 000000000000..695ec3029f68
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/sigset_t.h
@@ -0,0 +1,21 @@
+//===-- Proxy for sigset_t ------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_HDR_TYPES_SIGSET_T_H
+#define LLVM_LIBC_HDR_TYPES_SIGSET_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/sigset_t.h"
+
+#else
+
+#include <signal.h>
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_SIGSET_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/size_t.h b/contrib/llvm-project/libc/hdr/types/size_t.h
new file mode 100644
index 000000000000..1d9f26db3bbb
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/size_t.h
@@ -0,0 +1,23 @@
+//===-- Proxy for size_t --------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_HDR_TYPES_SIZE_T_H
+#define LLVM_LIBC_HDR_TYPES_SIZE_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/size_t.h"
+
+#else
+
+#define __need_size_t
+#include <stddef.h>
+#undef __need_size_t
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_SIZE_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/socklen_t.h b/contrib/llvm-project/libc/hdr/types/socklen_t.h
new file mode 100644
index 000000000000..79a6b9c7dead
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/socklen_t.h
@@ -0,0 +1,21 @@
+//===-- Proxy for socklen_t -----------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_HDR_TYPES_SOCKLEN_T_H
+#define LLVM_LIBC_HDR_TYPES_SOCKLEN_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/socklen_t.h"
+
+#else
+
+#include <signal.h>
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_SOCKLEN_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/ssize_t.h b/contrib/llvm-project/libc/hdr/types/ssize_t.h
new file mode 100644
index 000000000000..7eff98f33c2b
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/ssize_t.h
@@ -0,0 +1,21 @@
+//===-- Proxy for ssize_t -------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_HDR_TYPES_SSIZE_T_H
+#define LLVM_LIBC_HDR_TYPES_SSIZE_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/ssize_t.h"
+
+#else
+
+#include <sys/types.h>
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_SSIZE_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/stack_t.h b/contrib/llvm-project/libc/hdr/types/stack_t.h
new file mode 100644
index 000000000000..42dad3aa80c1
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/stack_t.h
@@ -0,0 +1,23 @@
+//===-- Definition of stack_t.h -------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_STACK_T_H
+#define LLVM_LIBC_HDR_TYPES_STACK_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/stack_t.h"
+
+#else // overlay mode
+
+#include <signal.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_STACK_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/struct_dl_phdr_info.h b/contrib/llvm-project/libc/hdr/types/struct_dl_phdr_info.h
new file mode 100644
index 000000000000..0cfb3c1309bd
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/struct_dl_phdr_info.h
@@ -0,0 +1,21 @@
+//===-- Proxy for struct dl_phdr_info  -----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_HDR_TYPES_STRUCT_DL_PHDR_INFO_H
+#define LLVM_LIBC_HDR_TYPES_STRUCT_DL_PHDR_INFO_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/struct_dl_phdr_info.h"
+
+#else
+
+#include <link.h>
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_STRUCT_DL_PHDR_INFO_H
diff --git a/contrib/llvm-project/libc/hdr/types/struct_epoll_event.h b/contrib/llvm-project/libc/hdr/types/struct_epoll_event.h
new file mode 100644
index 000000000000..5bb98ce05bb2
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/struct_epoll_event.h
@@ -0,0 +1,21 @@
+//===-- Proxy for struct epoll_event --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_HDR_TYPES_STRUCT_EPOLL_EVENT_H
+#define LLVM_LIBC_HDR_TYPES_STRUCT_EPOLL_EVENT_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/struct_epoll_event.h"
+
+#else
+
+#include <sys/epoll.h>
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_STRUCT_EPOLL_EVENT_H
diff --git a/contrib/llvm-project/libc/hdr/types/struct_f_owner_ex.h b/contrib/llvm-project/libc/hdr/types/struct_f_owner_ex.h
new file mode 100644
index 000000000000..6e37cea6df84
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/struct_f_owner_ex.h
@@ -0,0 +1,21 @@
+//===-- Proxy for struct f_owner_ex  --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_HDR_TYPES_STRUCT_F_OWNER_EX_H
+#define LLVM_LIBC_HDR_TYPES_STRUCT_F_OWNER_EX_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/struct_f_owner_ex.h"
+
+#else
+
+#include "hdr/fcntl_overlay.h"
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_STRUCT_F_OWNER_EX_H
diff --git a/contrib/llvm-project/libc/hdr/types/struct_flock.h b/contrib/llvm-project/libc/hdr/types/struct_flock.h
new file mode 100644
index 000000000000..6a6c928e6fa6
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/struct_flock.h
@@ -0,0 +1,21 @@
+//===-- Proxy for struct flock  -------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_HDR_TYPES_STRUCT_FLOCK_H
+#define LLVM_LIBC_HDR_TYPES_STRUCT_FLOCK_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/struct_flock.h"
+
+#else
+
+#include "hdr/fcntl_overlay.h"
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_STRUCT_FLOCK_H
diff --git a/contrib/llvm-project/libc/hdr/types/struct_flock64.h b/contrib/llvm-project/libc/hdr/types/struct_flock64.h
new file mode 100644
index 000000000000..fcfda59479a2
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/struct_flock64.h
@@ -0,0 +1,21 @@
+//===-- Proxy for struct flock64  -----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_HDR_TYPES_STRUCT_FLOCK64_H
+#define LLVM_LIBC_HDR_TYPES_STRUCT_FLOCK64_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/struct_flock64.h"
+
+#else
+
+#include "hdr/fcntl_overlay.h"
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_STRUCT_FLOCK64_H
diff --git a/contrib/llvm-project/libc/hdr/types/struct_iovec.h b/contrib/llvm-project/libc/hdr/types/struct_iovec.h
new file mode 100644
index 000000000000..fc6174c6d487
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/struct_iovec.h
@@ -0,0 +1,21 @@
+//===-- Proxy for struct iovec  -------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_HDR_TYPES_STRUCT_IOVEC_H
+#define LLVM_LIBC_HDR_TYPES_STRUCT_IOVEC_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/struct_iovec.h"
+
+#else
+
+#include <sys/uio.h>
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_STRUCT_IOVEC_H
diff --git a/contrib/llvm-project/libc/hdr/types/struct_itimerval.h b/contrib/llvm-project/libc/hdr/types/struct_itimerval.h
new file mode 100644
index 000000000000..b2281675b802
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/struct_itimerval.h
@@ -0,0 +1,21 @@
+//===-- Proxy for struct itimerval ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_HDR_TYPES_STRUCT_ITIMERVAL_H
+#define LLVM_LIBC_HDR_TYPES_STRUCT_ITIMERVAL_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/struct_itimerval.h"
+
+#else
+
+#include <sys/time.h>
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_STRUCT_ITIMERVAL_H
diff --git a/contrib/llvm-project/libc/hdr/types/struct_msghdr.h b/contrib/llvm-project/libc/hdr/types/struct_msghdr.h
new file mode 100644
index 000000000000..6a36af791e21
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/struct_msghdr.h
@@ -0,0 +1,21 @@
+//===-- Proxy for struct msghdr  ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_HDR_TYPES_STRUCT_MSGHDR_H
+#define LLVM_LIBC_HDR_TYPES_STRUCT_MSGHDR_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/struct_msghdr.h"
+
+#else
+
+#include <sys/socket.h>
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_STRUCT_MSGHDR_H
diff --git a/contrib/llvm-project/libc/hdr/types/struct_pollfd.h b/contrib/llvm-project/libc/hdr/types/struct_pollfd.h
new file mode 100644
index 000000000000..efec6fc80ac1
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/struct_pollfd.h
@@ -0,0 +1,23 @@
+//===-- Definition of struct pollfd ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_STRUCT_POLLFD_H
+#define LLVM_LIBC_HDR_TYPES_STRUCT_POLLFD_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/struct_pollfd.h"
+
+#else // overlay mode
+
+#include <poll.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_STRUCT_POLLFD_H
diff --git a/contrib/llvm-project/libc/hdr/types/struct_sigaction.h b/contrib/llvm-project/libc/hdr/types/struct_sigaction.h
new file mode 100644
index 000000000000..60f6caeb4af1
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/struct_sigaction.h
@@ -0,0 +1,21 @@
+//===-- Proxy for struct sigaction  ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_HDR_TYPES_STRUCT_SIGACTION_H
+#define LLVM_LIBC_HDR_TYPES_STRUCT_SIGACTION_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/struct_sigaction.h"
+
+#else
+
+#include <signal.h>
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_STRUCT_SIGACTION_H
diff --git a/contrib/llvm-project/libc/hdr/types/struct_sockaddr.h b/contrib/llvm-project/libc/hdr/types/struct_sockaddr.h
new file mode 100644
index 000000000000..0fc31d537485
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/struct_sockaddr.h
@@ -0,0 +1,21 @@
+//===-- Proxy for struct sockaddr  ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_HDR_TYPES_STRUCT_SOCKADDR_H
+#define LLVM_LIBC_HDR_TYPES_STRUCT_SOCKADDR_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/struct_sockaddr.h"
+
+#else
+
+#include <sys/socket.h>
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_STRUCT_SOCKADDR_H
diff --git a/contrib/llvm-project/libc/hdr/types/struct_timespec.h b/contrib/llvm-project/libc/hdr/types/struct_timespec.h
new file mode 100644
index 000000000000..1f121f3d24d8
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/struct_timespec.h
@@ -0,0 +1,21 @@
+//===-- Proxy for struct timespec  ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_HDR_TYPES_STRUCT_TIMESPEC_H
+#define LLVM_LIBC_HDR_TYPES_STRUCT_TIMESPEC_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/struct_timespec.h"
+
+#else
+
+#include <time.h>
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_STRUCT_TIMESPEC_H
diff --git a/contrib/llvm-project/libc/hdr/types/struct_timeval.h b/contrib/llvm-project/libc/hdr/types/struct_timeval.h
new file mode 100644
index 000000000000..8fc321a52d71
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/struct_timeval.h
@@ -0,0 +1,21 @@
+//===-- Proxy for struct timeval  ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_HDR_TYPES_STRUCT_TIMEVAL_H
+#define LLVM_LIBC_HDR_TYPES_STRUCT_TIMEVAL_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/struct_timeval.h"
+
+#else
+
+#include <sys/time.h>
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_STRUCT_TIMEVAL_H
diff --git a/contrib/llvm-project/libc/hdr/types/struct_tm.h b/contrib/llvm-project/libc/hdr/types/struct_tm.h
new file mode 100644
index 000000000000..96c23e2ce054
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/struct_tm.h
@@ -0,0 +1,21 @@
+//===-- Proxy for struct tm  ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_HDR_TYPES_STRUCT_TM_H
+#define LLVM_LIBC_HDR_TYPES_STRUCT_TM_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/struct_tm.h"
+
+#else
+
+#include <time.h>
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_STRUCT_TM_H
diff --git a/contrib/llvm-project/libc/hdr/types/suseconds_t.h b/contrib/llvm-project/libc/hdr/types/suseconds_t.h
new file mode 100644
index 000000000000..f60168c59fb8
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/suseconds_t.h
@@ -0,0 +1,22 @@
+//===-- Proxy for suseconds_t ---------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_SUSECONDS_T_H
+#define LLVM_LIBC_HDR_TYPES_SUSECONDS_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/suseconds_t.h"
+
+#else // Overlay mode
+
+#include <sys/types.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // #ifndef LLVM_LIBC_HDR_TYPES_SUSECONDS_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/time_t.h b/contrib/llvm-project/libc/hdr/types/time_t.h
new file mode 100644
index 000000000000..fc9a1506a2cd
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/time_t.h
@@ -0,0 +1,22 @@
+//===-- Proxy for time_t --------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_TIME_T_H
+#define LLVM_LIBC_HDR_TYPES_TIME_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/time_t.h"
+
+#else // Overlay mode
+
+#include <time.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_TIME_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/uid_t.h b/contrib/llvm-project/libc/hdr/types/uid_t.h
new file mode 100644
index 000000000000..a1eefb03228c
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/uid_t.h
@@ -0,0 +1,22 @@
+//===-- Proxy for uid_t ---------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_UID_T_H
+#define LLVM_LIBC_HDR_TYPES_UID_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/uid_t.h"
+
+#else // Overlay mode
+
+#include <sys/types.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_UID_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/wchar_t.h b/contrib/llvm-project/libc/hdr/types/wchar_t.h
new file mode 100644
index 000000000000..75e945239119
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/wchar_t.h
@@ -0,0 +1,23 @@
+//===-- Definition of wchar_t.h -------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_WCHAR_T_H
+#define LLVM_LIBC_HDR_TYPES_WCHAR_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/wchar_t.h"
+
+#else // overlay mode
+
+#include "hdr/wchar_overlay.h"
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_WCHAR_T_H
diff --git a/contrib/llvm-project/libc/hdr/types/wint_t.h b/contrib/llvm-project/libc/hdr/types/wint_t.h
new file mode 100644
index 000000000000..6b91859d35be
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/types/wint_t.h
@@ -0,0 +1,23 @@
+//===-- Definition of wint_t.h --------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_WINT_T_H
+#define LLVM_LIBC_HDR_TYPES_WINT_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/wint_t.h"
+
+#else // overlay mode
+
+#include "hdr/wchar_overlay.h"
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_WINT_T_H
diff --git a/contrib/llvm-project/libc/hdr/uchar_overlay.h b/contrib/llvm-project/libc/hdr/uchar_overlay.h
new file mode 100644
index 000000000000..44ed3d48c6c1
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/uchar_overlay.h
@@ -0,0 +1,69 @@
+//===-- Including uchar.h in overlay mode ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_UCHAR_OVERLAY_H
+#define LLVM_LIBC_HDR_UCHAR_OVERLAY_H
+
+#ifdef LIBC_FULL_BUILD
+#error "This header should only be included in overlay mode"
+#endif
+
+// Overlay mode
+
+// glibc <uchar.h> header might provide extern inline definitions for few
+// functions, causing external alias errors.  They are guarded by
+// `__USE_EXTERN_INLINES` macro.  We temporarily disable `__USE_EXTERN_INLINES`
+// macro by defining `__NO_INLINE__` before including <uchar.h>.
+// And the same with `__USE_FORTIFY_LEVEL`, which will be temporarily disabled
+// with `_FORTIFY_SOURCE`.
+
+#ifdef _FORTIFY_SOURCE
+#define LIBC_OLD_FORTIFY_SOURCE _FORTIFY_SOURCE
+#undef _FORTIFY_SOURCE
+#endif
+
+#ifndef __NO_INLINE__
+#define __NO_INLINE__ 1
+#define LIBC_SET_NO_INLINE
+#endif
+
+#ifdef __USE_EXTERN_INLINES
+#define LIBC_OLD_USE_EXTERN_INLINES
+#undef __USE_EXTERN_INLINES
+#endif
+
+#ifdef __USE_FORTIFY_LEVEL
+#define LIBC_OLD_USE_FORTIFY_LEVEL __USE_FORTIFY_LEVEL
+#undef __USE_FORTIFY_LEVEL
+#define __USE_FORTIFY_LEVEL 0
+#endif
+
+#include <uchar.h>
+
+#ifdef LIBC_OLD_FORTIFY_SOURCE
+#define _FORTIFY_SOURCE LIBC_OLD_FORTIFY_SOURCE
+#undef LIBC_OLD_FORTIFY_SOURCE
+#endif
+
+#ifdef LIBC_SET_NO_INLINE
+#undef __NO_INLINE__
+#undef LIBC_SET_NO_INLINE
+#endif
+
+#ifdef LIBC_OLD_USE_FORTIFY_LEVEL
+#undef __USE_FORTIFY_LEVEL
+#define __USE_FORTIFY_LEVEL LIBC_OLD_USE_FORTIFY_LEVEL
+#undef LIBC_OLD_USE_FORTIFY_LEVEL
+#endif
+
+#ifdef LIBC_OLD_USE_EXTERN_INLINES
+#define __USE_EXTERN_INLINES
+#undef LIBC_OLD_USE_EXTERN_INLINES
+#endif
+
+#endif // LLVM_LIBC_HDR_UCHAR_OVERLAY_H
diff --git a/contrib/llvm-project/libc/hdr/unistd_macros.h b/contrib/llvm-project/libc/hdr/unistd_macros.h
new file mode 100644
index 000000000000..5c2b24354dd3
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/unistd_macros.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from unistd.h --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_UNISTD_MACROS_H
+#define LLVM_LIBC_HDR_UNISTD_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/unistd-macros.h"
+
+#else // Overlay mode
+
+#include "unistd_overlay.h"
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_UNISTD_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/unistd_overlay.h b/contrib/llvm-project/libc/hdr/unistd_overlay.h
new file mode 100644
index 000000000000..e3001e0cda08
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/unistd_overlay.h
@@ -0,0 +1,69 @@
+//===-- Including unistd.h in overlay mode -------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_UNISTD_OVERLAY_H
+#define LLVM_LIBC_HDR_UNISTD_OVERLAY_H
+
+#ifdef LIBC_FULL_BUILD
+#error "This header should only be included in overlay mode"
+#endif
+
+// Overlay mode
+
+// glibc <unistd.h> header might provide extern inline definitions for few
+// functions, causing external alias errors.  They are guarded by
+// `__USE_EXTERN_INLINES` macro.  We temporarily disable `__USE_EXTERN_INLINES`
+// macro by defining `__NO_INLINE__` before including <stdio.h>.
+// And the same with `__USE_FORTIFY_LEVEL`, which will be temporarily disabled
+// with `_FORTIFY_SOURCE`.
+
+#ifdef _FORTIFY_SOURCE
+#define LIBC_OLD_FORTIFY_SOURCE _FORTIFY_SOURCE
+#undef _FORTIFY_SOURCE
+#endif
+
+#ifdef __USE_EXTERN_INLINES
+#define LIBC_OLD_USE_EXTERN_INLINES
+#undef __USE_EXTERN_INLINES
+#endif
+
+#ifdef __USE_FORTIFY_LEVEL
+#define LIBC_OLD_USE_FORTIFY_LEVEL __USE_FORTIFY_LEVEL
+#undef __USE_FORTIFY_LEVEL
+#define __USE_FORTIFY_LEVEL 0
+#endif
+
+#ifndef __NO_INLINE__
+#define __NO_INLINE__ 1
+#define LIBC_SET_NO_INLINE
+#endif
+
+#include <unistd.h>
+
+#ifdef LIBC_OLD_FORTIFY_SOURCE
+#define _FORTIFY_SOURCE LIBC_OLD_FORTIFY_SOURCE
+#undef LIBC_OLD_FORTIFY_SOURCE
+#endif
+
+#ifdef LIBC_SET_NO_INLINE
+#undef __NO_INLINE__
+#undef LIBC_SET_NO_INLINE
+#endif
+
+#ifdef LIBC_OLD_USE_FORTIFY_LEVEL
+#undef __USE_FORTIFY_LEVEL
+#define __USE_FORTIFY_LEVEL LIBC_OLD_USE_FORTIFY_LEVEL
+#undef LIBC_OLD_USE_FORTIFY_LEVEL
+#endif
+
+#ifdef LIBC_OLD_USE_EXTERN_INLINES
+#define __USE_EXTERN_INLINES
+#undef LIBC_OLD_USE_EXTERN_INLINES
+#endif
+
+#endif // LLVM_LIBC_HDR_UNISTD_OVERLAY_H
diff --git a/contrib/llvm-project/libc/hdr/wchar_macros.h b/contrib/llvm-project/libc/hdr/wchar_macros.h
new file mode 100644
index 000000000000..8b90768fc3ad
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/wchar_macros.h
@@ -0,0 +1,22 @@
+//===-- Definition of macros from wchar.h ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_WCHAR_MACROS_H
+#define LLVM_LIBC_HDR_WCHAR_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/wchar-macros.h"
+
+#else // Overlay mode
+
+#include "hdr/wchar_overlay.h"
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_WCHAR_MACROS_H
diff --git a/contrib/llvm-project/libc/hdr/wchar_overlay.h b/contrib/llvm-project/libc/hdr/wchar_overlay.h
new file mode 100644
index 000000000000..52d3a0cc6596
--- /dev/null
+++ b/contrib/llvm-project/libc/hdr/wchar_overlay.h
@@ -0,0 +1,69 @@
+//===-- Including wchar.h in overlay mode ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_WCHAR_OVERLAY_H
+#define LLVM_LIBC_HDR_WCHAR_OVERLAY_H
+
+#ifdef LIBC_FULL_BUILD
+#error "This header should only be included in overlay mode"
+#endif
+
+// Overlay mode
+
+// glibc <wchar.h> header might provide extern inline definitions for few
+// functions, causing external alias errors.  They are guarded by
+// `__USE_EXTERN_INLINES` macro.  We temporarily disable `__USE_EXTERN_INLINES`
+// macro by defining `__NO_INLINE__` before including <wchar.h>.
+// And the same with `__USE_FORTIFY_LEVEL`, which will be temporarily disabled
+// with `_FORTIFY_SOURCE`.
+
+#ifdef _FORTIFY_SOURCE
+#define LIBC_OLD_FORTIFY_SOURCE _FORTIFY_SOURCE
+#undef _FORTIFY_SOURCE
+#endif
+
+#ifndef __NO_INLINE__
+#define __NO_INLINE__ 1
+#define LIBC_SET_NO_INLINE
+#endif
+
+#ifdef __USE_EXTERN_INLINES
+#define LIBC_OLD_USE_EXTERN_INLINES
+#undef __USE_EXTERN_INLINES
+#endif
+
+#ifdef __USE_FORTIFY_LEVEL
+#define LIBC_OLD_USE_FORTIFY_LEVEL __USE_FORTIFY_LEVEL
+#undef __USE_FORTIFY_LEVEL
+#define __USE_FORTIFY_LEVEL 0
+#endif
+
+#include <wchar.h>
+
+#ifdef LIBC_OLD_FORTIFY_SOURCE
+#define _FORTIFY_SOURCE LIBC_OLD_FORTIFY_SOURCE
+#undef LIBC_OLD_FORTIFY_SOURCE
+#endif
+
+#ifdef LIBC_SET_NO_INLINE
+#undef __NO_INLINE__
+#undef LIBC_SET_NO_INLINE
+#endif
+
+#ifdef LIBC_OLD_USE_FORTIFY_LEVEL
+#undef __USE_FORTIFY_LEVEL
+#define __USE_FORTIFY_LEVEL LIBC_OLD_USE_FORTIFY_LEVEL
+#undef LIBC_OLD_USE_FORTIFY_LEVEL
+#endif
+
+#ifdef LIBC_OLD_USE_EXTERN_INLINES
+#define __USE_EXTERN_INLINES
+#undef LIBC_OLD_USE_EXTERN_INLINES
+#endif
+
+#endif // LLVM_LIBC_HDR_WCHAR_OVERLAY_H
diff --git a/contrib/llvm-project/libc/include/__llvm-libc-common.h b/contrib/llvm-project/libc/include/__llvm-libc-common.h
new file mode 100644
index 000000000000..c6fd33a55532
--- /dev/null
+++ b/contrib/llvm-project/libc/include/__llvm-libc-common.h
@@ -0,0 +1,98 @@
+//===-- Common definitions for LLVM-libc public header files --------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LLVM_LIBC_COMMON_H
+#define _LLVM_LIBC_COMMON_H
+
+#define __LLVM_LIBC__ 1
+
+#ifdef __cplusplus
+
+#undef __BEGIN_C_DECLS
+#define __BEGIN_C_DECLS extern "C" {
+
+#undef __END_C_DECLS
+#define __END_C_DECLS }
+
+// Standard C++ doesn't have C99 restrict but GNU C++ has it with __ spelling.
+#undef __restrict
+#ifndef __GNUC__
+#define __restrict
+#endif
+
+#undef _Noreturn
+#define _Noreturn [[noreturn]]
+
+#undef _Alignas
+#define _Alignas alignas
+
+#undef _Static_assert
+#define _Static_assert static_assert
+
+#undef _Alignof
+#define _Alignof alignof
+
+#undef _Thread_local
+#define _Thread_local thread_local
+
+#undef __NOEXCEPT
+#if __cplusplus >= 201103L
+#define __NOEXCEPT noexcept
+#else
+#define __NOEXCEPT throw()
+#endif
+
+// This macro serves as a generic cast implementation for use in both C and C++,
+// similar to `__BIONIC_CAST` in Android.
+#undef __LLVM_LIBC_CAST
+#define __LLVM_LIBC_CAST(cast, type, value) (cast<type>(value))
+
+#else // not __cplusplus
+
+#undef __BEGIN_C_DECLS
+#define __BEGIN_C_DECLS
+
+#undef __END_C_DECLS
+#define __END_C_DECLS
+
+#undef __restrict
+#if __STDC_VERSION__ >= 199901L
+// C99 and above support the restrict keyword.
+#define __restrict restrict
+#elif !defined(__GNUC__)
+// GNU-compatible compilers accept the __ spelling in all modes.
+// Otherwise, omit the qualifier for pure C89 compatibility.
+#define __restrict
+#endif
+
+#undef _Noreturn
+#if __STDC_VERSION__ >= 201112L
+// In C11 and later, _Noreturn is a keyword.
+#elif defined(__GNUC__)
+// GNU-compatible compilers have an equivalent attribute.
+#define _Noreturn __attribute__((__noreturn__))
+#else
+#define _Noreturn
+#endif
+
+#undef __NOEXCEPT
+#ifdef __GNUC__
+#define __NOEXCEPT __attribute__((__nothrow__))
+#else
+#define __NOEXCEPT
+#endif
+
+#undef _Returns_twice
+#define _Returns_twice __attribute__((returns_twice))
+
+#undef __LLVM_LIBC_CAST
+#define __LLVM_LIBC_CAST(cast, type, value) ((type)(value))
+
+#endif // __cplusplus
+
+#endif // _LLVM_LIBC_COMMON_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/EFIAPI-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/EFIAPI-macros.h
new file mode 100644
index 000000000000..cb854928d0ab
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/EFIAPI-macros.h
@@ -0,0 +1,18 @@
+//===-- Definition of EFIAPI macro ------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_EFIAPI_MACROS_H
+#define LLVM_LIBC_MACROS_EFIAPI_MACROS_H
+
+#if defined(__x86_64__) && !defined(__ILP32__)
+#define EFIAPI __attribute__((ms_abi))
+#else
+#define EFIAPI
+#endif
+
+#endif // LLVM_LIBC_MACROS_EFIAPI_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/assert-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/assert-macros.h
new file mode 100644
index 000000000000..44e14543d856
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/assert-macros.h
@@ -0,0 +1,14 @@
+//===-- Definition of macros to be used with assert functions -------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_LIBC_MACROS_ASSERT_MACROS_H
+#define __LLVM_LIBC_MACROS_ASSERT_MACROS_H
+
+#define __STDC_VERSION_ASSERT_H__ 202311L
+
+#endif // __LLVM_LIBC_MACROS_ASSERT_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/baremetal/time-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/baremetal/time-macros.h
new file mode 100644
index 000000000000..3537376c4bca
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/baremetal/time-macros.h
@@ -0,0 +1,26 @@
+//===-- Definition of macros from time.h ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_BAREMETAL_TIME_MACROS_H
+#define LLVM_LIBC_MACROS_BAREMETAL_TIME_MACROS_H
+
+#ifdef __CLK_TCK
+#define CLOCKS_PER_SEC __CLK_TCK
+#else
+#if defined(__arm__) || defined(_M_ARM) || defined(__aarch64__) ||             \
+    defined(__arm64__) || defined(_M_ARM64)
+// This default implementation of this function shall use semihosting
+// Semihosting measures time in centiseconds
+// https://github.com/ARM-software/abi-aa/blob/main/semihosting/semihosting.rst#sys-clock-0x10
+#define CLOCKS_PER_SEC 100
+#else
+#define CLOCKS_PER_SEC 1000000
+#endif
+#endif
+
+#endif // LLVM_LIBC_MACROS_BAREMETAL_TIME_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/complex-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/complex-macros.h
new file mode 100644
index 000000000000..427c68d289e0
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/complex-macros.h
@@ -0,0 +1,24 @@
+//===-- Definition of macros to be used with complex functions ------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_LIBC_MACROS_COMPLEX_MACROS_H
+#define __LLVM_LIBC_MACROS_COMPLEX_MACROS_H
+
+#ifndef __STDC_NO_COMPLEX__
+
+#define __STDC_VERSION_COMPLEX_H__ 202311L
+
+#define complex _Complex
+#define _Complex_I ((_Complex float)1.0fi)
+#define I _Complex_I
+
+// TODO: Add imaginary macros once GCC or Clang support _Imaginary builtin-type.
+
+#endif
+
+#endif // __LLVM_LIBC_MACROS_COMPLEX_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/containerof-macro.h b/contrib/llvm-project/libc/include/llvm-libc-macros/containerof-macro.h
new file mode 100644
index 000000000000..debf441bf845
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/containerof-macro.h
@@ -0,0 +1,20 @@
+//===-- Definition of the containerof macro -------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_CONTAINEROF_MACRO_H
+#define LLVM_LIBC_MACROS_CONTAINEROF_MACRO_H
+
+#include "offsetof-macro.h"
+
+#define __containerof(ptr, type, member)                                       \
+  ({                                                                           \
+    const __typeof(((type *)0)->member) *__ptr = (ptr);                        \
+    (type *)(void *)((const char *)__ptr - offsetof(type, member));            \
+  })
+
+#endif // LLVM_LIBC_MACROS_CONTAINEROF_MACRO_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/dlfcn-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/dlfcn-macros.h
new file mode 100644
index 000000000000..dcd202b9ab43
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/dlfcn-macros.h
@@ -0,0 +1,23 @@
+//===-- Definition of macros from dlfcn.h ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_DLFCN_MACROS_H
+#define LLVM_LIBC_MACROS_DLFCN_MACROS_H
+
+#define RTLD_LAZY 0x00001
+#define RTLD_NOW 0x00002
+#define RTLD_GLOBAL 0x00100
+#define RTLD_LOCAL 0
+
+// Non-standard stuff here
+#define RTLD_BINDING_MASK 0x3
+#define RTLD_NOLOAD 0x00004
+#define RTLD_DEEPBIND 0x00008
+#define RTLD_NODELETE 0x01000
+
+#endif // LLVM_LIBC_MACROS_DLFCN_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/elf-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/elf-macros.h
new file mode 100644
index 000000000000..fa4442abf0f5
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/elf-macros.h
@@ -0,0 +1,18 @@
+//===-- Definition of macros from elf.h -----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_ELF_MACROS_H
+#define LLVM_LIBC_MACROS_ELF_MACROS_H
+
+#if __has_include(<linux/elf.h>)
+#include <linux/elf.h>
+#else
+#error "cannot use <sys/elf.h> without proper system headers."
+#endif
+
+#endif // LLVM_LIBC_MACROS_ELF_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/endian-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/endian-macros.h
new file mode 100644
index 000000000000..52d95dc01cd8
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/endian-macros.h
@@ -0,0 +1,50 @@
+//===-- Definition of macros from endian.h --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_ENDIAN_MACROS_H
+#define LLVM_LIBC_MACROS_ENDIAN_MACROS_H
+
+#include "stdint-macros.h"
+
+#define LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__
+#define BIG_ENDIAN __ORDER_BIG_ENDIAN__
+#define BYTE_ORDER __BYTE_ORDER__
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+
+#define htobe16(x) __builtin_bswap16((x))
+#define htobe32(x) __builtin_bswap32((x))
+#define htobe64(x) __builtin_bswap64((x))
+#define htole16(x) __LLVM_LIBC_CAST(static_cast, uint16_t, x)
+#define htole32(x) __LLVM_LIBC_CAST(static_cast, uint32_t, x)
+#define htole64(x) __LLVM_LIBC_CAST(static_cast, uint64_t, x)
+#define be16toh(x) __builtin_bswap16((x))
+#define be32toh(x) __builtin_bswap32((x))
+#define be64toh(x) __builtin_bswap64((x))
+#define le16toh(x) __LLVM_LIBC_CAST(static_cast, uint16_t, x)
+#define le32toh(x) __LLVM_LIBC_CAST(static_cast, uint32_t, x)
+#define le64toh(x) __LLVM_LIBC_CAST(static_cast, uint64_t, x)
+
+#else
+
+#define htobe16(x) __LLVM_LIBC_CAST(static_cast, uint16_t, x)
+#define htobe32(x) __LLVM_LIBC_CAST(static_cast, uint32_t, x)
+#define htobe64(x) __LLVM_LIBC_CAST(static_cast, uint64_t, x)
+#define htole16(x) __builtin_bswap16((x))
+#define htole32(x) __builtin_bswap32((x))
+#define htole64(x) __builtin_bswap64((x))
+#define be16toh(x) __LLVM_LIBC_CAST(static_cast, uint16_t, x)
+#define be32toh(x) __LLVM_LIBC_CAST(static_cast, uint32_t, x)
+#define be64toh(x) __LLVM_LIBC_CAST(static_cast, uint64_t, x)
+#define le16toh(x) __builtin_bswap16((x))
+#define le32toh(x) __builtin_bswap32((x))
+#define le64toh(x) __builtin_bswap64((x))
+
+#endif
+
+#endif // LLVM_LIBC_MACROS_ENDIAN_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/error-number-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/error-number-macros.h
new file mode 100644
index 000000000000..29bd54d07f2e
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/error-number-macros.h
@@ -0,0 +1,8 @@
+#ifndef LLVM_LIBC_MACROS_ERROR_NUMBER_MACROS_H
+#define LLVM_LIBC_MACROS_ERROR_NUMBER_MACROS_H
+
+#ifdef __linux__
+#include "linux/error-number-macros.h"
+#endif
+
+#endif // LLVM_LIBC_MACROS_ERROR_NUMBER_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/fcntl-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/fcntl-macros.h
new file mode 100644
index 000000000000..4bd03a7e3e2b
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/fcntl-macros.h
@@ -0,0 +1,8 @@
+#ifndef LLVM_LIBC_MACROS_FCNTL_MACROS_H
+#define LLVM_LIBC_MACROS_FCNTL_MACROS_H
+
+#ifdef __linux__
+#include "linux/fcntl-macros.h"
+#endif
+
+#endif // LLVM_LIBC_MACROS_FCNTL_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/features-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/features-macros.h
new file mode 100644
index 000000000000..f87ae4ad1240
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/features-macros.h
@@ -0,0 +1,12 @@
+//===-- Definition of macros from features.h ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_FEATURES_MACROS_H
+#define LLVM_LIBC_MACROS_FEATURES_MACROS_H
+
+#endif // LLVM_LIBC_MACROS_FEATURES_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/fenv-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/fenv-macros.h
new file mode 100644
index 000000000000..1826723f9349
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/fenv-macros.h
@@ -0,0 +1,28 @@
+//===-- Definition of macros from fenv.h ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_FENV_MACROS_H
+#define LLVM_LIBC_MACROS_FENV_MACROS_H
+
+#define FE_DIVBYZERO 0x1
+#define FE_INEXACT 0x2
+#define FE_INVALID 0x4
+#define FE_OVERFLOW 0x8
+#define FE_UNDERFLOW 0x10
+#define __FE_DENORM 0x20
+#define FE_ALL_EXCEPT                                                          \
+  (FE_DIVBYZERO | FE_INEXACT | FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
+
+#define FE_DOWNWARD 0x400
+#define FE_TONEAREST 0
+#define FE_TOWARDZERO 0xC00
+#define FE_UPWARD 0x800
+
+#define FE_DFL_ENV ((fenv_t *)-1)
+
+#endif // LLVM_LIBC_MACROS_FENV_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/file-seek-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/file-seek-macros.h
new file mode 100644
index 000000000000..676cb7511407
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/file-seek-macros.h
@@ -0,0 +1,16 @@
+//===-- Definition of macros to be used with file seek functions ----------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_FILE_SEEK_MACROS_H
+#define LLVM_LIBC_MACROS_FILE_SEEK_MACROS_H
+
+#define SEEK_SET 0
+#define SEEK_CUR 1
+#define SEEK_END 2
+
+#endif // LLVM_LIBC_MACROS_FILE_SEEK_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/float-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/float-macros.h
new file mode 100644
index 000000000000..a25ef60a293d
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/float-macros.h
@@ -0,0 +1,178 @@
+//===-- Definition of macros from float.h ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_FLOAT_MACROS_H
+#define LLVM_LIBC_MACROS_FLOAT_MACROS_H
+
+#ifndef FLT_RADIX
+#define FLT_RADIX __FLT_RADIX__
+#endif // FLT_RADIX
+
+#ifndef FLT_EVAL_METHOD
+#define FLT_EVAL_METHOD __FLT_EVAL_METHOD__
+#endif // FLT_EVAL_METHOD
+
+#ifndef FLT_ROUNDS
+#if __has_builtin(__builtin_flt_rounds)
+#define FLT_ROUNDS __builtin_flt_rounds()
+#else
+#define FLT_ROUNDS 1
+#endif
+#endif // FLT_ROUNDS
+
+#ifndef FLT_DECIMAL_DIG
+#define FLT_DECIMAL_DIG __FLT_DECIMAL_DIG__
+#endif // FLT_DECIMAL_DIG
+
+#ifndef DBL_DECIMAL_DIG
+#define DBL_DECIMAL_DIG __DBL_DECIMAL_DIG__
+#endif // DBL_DECIMAL_DIG
+
+#ifndef LDBL_DECIMAL_DIG
+#define LDBL_DECIMAL_DIG __LDBL_DECIMAL_DIG__
+#endif // LDBL_DECIMAL_DIG
+
+#ifndef DECIMAL_DIG
+#define DECIMAL_DIG __DECIMAL_DIG__
+#endif // DECIMAL_DIG
+
+#ifndef FLT_DIG
+#define FLT_DIG __FLT_DIG__
+#endif // FLT_DIG
+
+#ifndef DBL_DIG
+#define DBL_DIG __DBL_DIG__
+#endif // DBL_DIG
+
+#ifndef LDBL_DIG
+#define LDBL_DIG __LDBL_DIG__
+#endif // LDBL_DIG
+
+#ifndef FLT_MANT_DIG
+#define FLT_MANT_DIG __FLT_MANT_DIG__
+#endif // FLT_MANT_DIG
+
+#ifndef DBL_MANT_DIG
+#define DBL_MANT_DIG __DBL_MANT_DIG__
+#endif // DBL_MANT_DIG
+
+#ifndef LDBL_MANT_DIG
+#define LDBL_MANT_DIG __LDBL_MANT_DIG__
+#endif // LDBL_MANT_DIG
+
+#ifndef FLT_MIN
+#define FLT_MIN __FLT_MIN__
+#endif // FLT_MIN
+
+#ifndef DBL_MIN
+#define DBL_MIN __DBL_MIN__
+#endif // DBL_MIN
+
+#ifndef LDBL_MIN
+#define LDBL_MIN __LDBL_MIN__
+#endif // LDBL_MIN
+
+#ifndef FLT_MAX
+#define FLT_MAX __FLT_MAX__
+#endif // FLT_MAX
+
+#ifndef DBL_MAX
+#define DBL_MAX __DBL_MAX__
+#endif // DBL_MAX
+
+#ifndef LDBL_MAX
+#define LDBL_MAX __LDBL_MAX__
+#endif // LDBL_MAX
+
+#ifndef FLT_TRUE_MIN
+#define FLT_TRUE_MIN __FLT_DENORM_MIN__
+#endif // FLT_TRUE_MIN
+
+#ifndef DBL_TRUE_MIN
+#define DBL_TRUE_MIN __DBL_DENORM_MIN__
+#endif // DBL_TRUE_MIN
+
+#ifndef LDBL_TRUE_MIN
+#define LDBL_TRUE_MIN __LDBL_DENORM_MIN__
+#endif // LDBL_TRUE_MIN
+
+#ifndef FLT_EPSILON
+#define FLT_EPSILON __FLT_EPSILON__
+#endif // FLT_EPSILON
+
+#ifndef DBL_EPSILON
+#define DBL_EPSILON __DBL_EPSILON__
+#endif // DBL_EPSILON
+
+#ifndef LDBL_EPSILON
+#define LDBL_EPSILON __LDBL_EPSILON__
+#endif // LDBL_EPSILON
+
+#ifndef FLT_MIN_EXP
+#define FLT_MIN_EXP __FLT_MIN_EXP__
+#endif // FLT_MIN_EXP
+
+#ifndef DBL_MIN_EXP
+#define DBL_MIN_EXP __DBL_MIN_EXP__
+#endif // DBL_MIN_EXP
+
+#ifndef LDBL_MIN_EXP
+#define LDBL_MIN_EXP __LDBL_MIN_EXP__
+#endif // LDBL_MIN_EXP
+
+#ifndef FLT_MIN_10_EXP
+#define FLT_MIN_10_EXP __FLT_MIN_10_EXP__
+#endif // FLT_MIN_10_EXP
+
+#ifndef DBL_MIN_10_EXP
+#define DBL_MIN_10_EXP __DBL_MIN_10_EXP__
+#endif // DBL_MIN_10_EXP
+
+#ifndef LDBL_MIN_10_EXP
+#define LDBL_MIN_10_EXP __LDBL_MIN_10_EXP__
+#endif // LDBL_MIN_10_EXP
+
+#ifndef FLT_MAX_EXP
+#define FLT_MAX_EXP __FLT_MAX_EXP__
+#endif // FLT_MAX_EXP
+
+#ifndef DBL_MAX_EXP
+#define DBL_MAX_EXP __DBL_MAX_EXP__
+#endif // DBL_MAX_EXP
+
+#ifndef LDBL_MAX_EXP
+#define LDBL_MAX_EXP __LDBL_MAX_EXP__
+#endif // LDBL_MAX_EXP
+
+#ifndef FLT_MAX_10_EXP
+#define FLT_MAX_10_EXP __FLT_MAX_10_EXP__
+#endif // FLT_MAX_10_EXP
+
+#ifndef DBL_MAX_10_EXP
+#define DBL_MAX_10_EXP __DBL_MAX_10_EXP__
+#endif // DBL_MAX_10_EXP
+
+#ifndef LDBL_MAX_10_EXP
+#define LDBL_MAX_10_EXP __LDBL_MAX_10_EXP__
+#endif // LDBL_MAX_10_EXP
+
+#ifndef FLT_HAS_SUBNORM
+#define FLT_HAS_SUBNORM __FLT_HAS_DENORM__
+#endif // FLT_HAS_SUBNORM
+
+#ifndef DBL_HAS_SUBNORM
+#define DBL_HAS_SUBNORM __DBL_HAS_DENORM__
+#endif // DBL_HAS_SUBNORM
+
+#ifndef LDBL_HAS_SUBNORM
+#define LDBL_HAS_SUBNORM __LDBL_HAS_DENORM__
+#endif // LDBL_HAS_SUBNORM
+
+// TODO: Add FLT16 and FLT128 constants.
+
+#endif // LLVM_LIBC_MACROS_FLOAT_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/float16-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/float16-macros.h
new file mode 100644
index 000000000000..229e3e62f2ae
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/float16-macros.h
@@ -0,0 +1,27 @@
+//===-- Detection of _Float16 compiler builtin type -----------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_FLOAT16_MACROS_H
+#define LLVM_LIBC_MACROS_FLOAT16_MACROS_H
+
+#include "../llvm-libc-types/float128.h"
+
+#if defined(__FLT16_MANT_DIG__) &&                                             \
+    (!defined(__GNUC__) || __GNUC__ >= 13 || defined(__clang__)) &&            \
+    !defined(__arm__) && !defined(_M_ARM) && !defined(__riscv) &&              \
+    !defined(_WIN32)
+#define LIBC_TYPES_HAS_FLOAT16
+
+// TODO: This would no longer be required if HdrGen let us guard function
+// declarations with multiple macros.
+#ifdef LIBC_TYPES_HAS_FLOAT128
+#define LIBC_TYPES_HAS_FLOAT16_AND_FLOAT128
+#endif // LIBC_TYPES_HAS_FLOAT128
+#endif
+
+#endif // LLVM_LIBC_MACROS_FLOAT16_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/generic-error-number-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/generic-error-number-macros.h
new file mode 100644
index 000000000000..199a86217b34
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/generic-error-number-macros.h
@@ -0,0 +1,48 @@
+//===-- Definition of generic error number macros -------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_GENERIC_ERROR_NUMBER_MACROS_H
+#define LLVM_LIBC_MACROS_GENERIC_ERROR_NUMBER_MACROS_H
+
+#define EPERM 1
+#define ENOENT 2
+#define ESRCH 3
+#define EINTR 4
+#define EIO 5
+#define ENXIO 6
+#define E2BIG 7
+#define ENOEXEC 8
+#define EBADF 9
+#define ECHILD 10
+#define EAGAIN 11
+#define ENOMEM 12
+#define EACCES 13
+#define EFAULT 14
+#define ENOTBLK 15
+#define EBUSY 16
+#define EEXIST 17
+#define EXDEV 18
+#define ENODEV 19
+#define ENOTDIR 20
+#define EISDIR 21
+#define EINVAL 22
+#define ENFILE 23
+#define EMFILE 24
+#define ENOTTY 25
+#define ETXTBSY 26
+#define EFBIG 27
+#define ENOSPC 28
+#define ESPIPE 29
+#define EROFS 30
+#define EMLINK 31
+#define EPIPE 32
+#define EDOM 33
+#define ERANGE 34
+#define EILSEQ 84
+
+#endif // LLVM_LIBC_MACROS_GENERIC_ERROR_NUMBER_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/gpu/signal-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/gpu/signal-macros.h
new file mode 100644
index 000000000000..f0d49ea34fe0
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/gpu/signal-macros.h
@@ -0,0 +1,28 @@
+//===-- Definition of GPU signal number macros ----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_GPU_SIGNAL_MACROS_H
+#define LLVM_LIBC_MACROS_GPU_SIGNAL_MACROS_H
+
+#define SIGINT 2
+#define SIGILL 4
+#define SIGABRT 6
+#define SIGFPE 8
+#define SIGSEGV 11
+#define SIGTERM 15
+
+#define SIG_DFL ((void (*)(int))(0))
+#define SIG_IGN ((void (*)(int))(1))
+#define SIG_ERR ((void (*)(int))(-1))
+
+// Max signal number
+#define NSIG 64
+
+#define __NSIGSET_WORDS NSIG
+
+#endif // LLVM_LIBC_MACROS_GPU_SIGNAL_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/gpu/time-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/gpu/time-macros.h
new file mode 100644
index 000000000000..7142a3e1b276
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/gpu/time-macros.h
@@ -0,0 +1,17 @@
+//===-- Definition of macros from time.h ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_GPU_TIME_MACROS_H
+#define LLVM_LIBC_MACROS_GPU_TIME_MACROS_H
+
+#define CLOCK_REALTIME 0
+#define CLOCK_MONOTONIC 1
+
+#define CLOCKS_PER_SEC 1000000
+
+#endif // LLVM_LIBC_MACROS_GPU_TIME_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/inttypes-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/inttypes-macros.h
new file mode 100644
index 000000000000..9b554670271e
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/inttypes-macros.h
@@ -0,0 +1,420 @@
+//===-- Definition of macros from inttypes.h ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_MACROS_INTTYPES_MACROS_H
+#define LLVM_LIBC_MACROS_INTTYPES_MACROS_H
+
+// fprintf/scanf format macros.
+#define __STDC_VERSION_INTTYPES_H__ 202311L
+
+// clang provides these macros, so we don't need to define them.
+#ifndef __clang__
+#if __UINTPTR_MAX__ == __UINT64_MAX__
+#define __PRI64 "l"
+#define __PRIPTR "l"
+#elif __UINTPTR_MAX__ == __UINT32_MAX__
+#define __PRI64 "ll"
+#define __PRIPTR ""
+#else
+// CHERI achitecture for example, has 128-bit pointers that use special "P"
+// format.
+#error "Unsupported pointer format"
+#endif
+#define __INT8_FMTd__ "hhd"
+#define __INT16_FMTd__ "hd"
+#define __INT32_FMTd__ "d"
+#define __INT64_FMTd__ __PRI64 "d"
+#define __INT_LEAST8_FMTd__ "hhd"
+#define __INT_LEAST16_FMTd__ "hd"
+#define __INT_LEAST32_FMTd__ "d"
+#define __INT_LEAST64_FMTd__ __PRI64 "d"
+#define __INT_FAST8_FMTd__ "hhd"
+#define __INT_FAST16_FMTd__ "hd"
+#define __INT_FAST32_FMTd__ "d"
+#define __INT_FAST64_FMTd__ __PRI64 "d"
+#define __INTMAX_FMTd__ __PRI64 "d"
+#define __INTPTR_FMTd__ __PRIPTR "d"
+
+#define __INT8_FMTi__ "hhi"
+#define __INT16_FMTi__ "hi"
+#define __INT32_FMTi__ "i"
+#define __INT64_FMTi__ __PRI64 "i"
+#define __INT_LEAST8_FMTi__ "hhi"
+#define __INT_LEAST16_FMTi__ "hi"
+#define __INT_LEAST32_FMTi__ "i"
+#define __INT_LEAST64_FMTi__ __PRI64 "i"
+#define __INT_FAST8_FMTi__ "hhi"
+#define __INT_FAST16_FMTi__ "hi"
+#define __INT_FAST32_FMTi__ "i"
+#define __INT_FAST64_FMTi__ __PRI64 "i"
+#define __INTMAX_FMTi__ __PRI64 "i"
+#define __INTPTR_FMTi__ __PRIPTR "i"
+
+#define __UINT8_FMTo__ "hho"
+#define __UINT16_FMTo__ "ho"
+#define __UINT32_FMTo__ "o"
+#define __UINT64_FMTo__ __PRI64 "o"
+#define __UINT_LEAST8_FMTo__ "hho"
+#define __UINT_LEAST16_FMTo__ "ho"
+#define __UINT_LEAST32_FMTo__ "o"
+#define __UINT_LEAST64_FMTo__ __PRI64 "o"
+#define __UINT_FAST8_FMTo__ "hho"
+#define __UINT_FAST16_FMTo__ "ho"
+#define __UINT_FAST32_FMTo__ "o"
+#define __UINT_FAST64_FMTo__ __PRI64 "o"
+#define __UINTMAX_FMTo__ __PRI64 "o"
+#define __UINTPTR_FMTo__ __PRIPTR "o"
+
+#define __UINT8_FMTu__ "hhu"
+#define __UINT16_FMTu__ "hu"
+#define __UINT32_FMTu__ "u"
+#define __UINT64_FMTu__ __PRI64 "u"
+#define __UINT_LEAST8_FMTu__ "hhu"
+#define __UINT_LEAST16_FMTu__ "hu"
+#define __UINT_LEAST32_FMTu__ "u"
+#define __UINT_LEAST64_FMTu__ __PRI64 "u"
+#define __UINT_FAST8_FMTu__ "hhu"
+#define __UINT_FAST16_FMTu__ "hu"
+#define __UINT_FAST32_FMTu__ "u"
+#define __UINT_FAST64_FMTu__ __PRI64 "u"
+#define __UINTMAX_FMTu__ __PRI64 "u"
+#define __UINTPTR_FMTu__ __PRIPTR "u"
+
+#define __UINT8_FMTx__ "hhx"
+#define __UINT16_FMTx__ "hx"
+#define __UINT32_FMTx__ "x"
+#define __UINT64_FMTx__ __PRI64 "x"
+#define __UINT_LEAST8_FMTx__ "hhx"
+#define __UINT_LEAST16_FMTx__ "hx"
+#define __UINT_LEAST32_FMTx__ "x"
+#define __UINT_LEAST64_FMTx__ __PRI64 "x"
+#define __UINT_FAST8_FMTx__ "hhx"
+#define __UINT_FAST16_FMTx__ "hx"
+#define __UINT_FAST32_FMTx__ "x"
+#define __UINT_FAST64_FMTx__ __PRI64 "x"
+#define __UINTMAX_FMTx__ __PRI64 "x"
+#define __UINTPTR_FMTx__ __PRIPTR "x"
+
+#define __UINT8_FMTX__ "hhX"
+#define __UINT16_FMTX__ "hX"
+#define __UINT32_FMTX__ "X"
+#define __UINT64_FMTX__ __PRI64 "X"
+#define __UINT_LEAST8_FMTX__ "hhX"
+#define __UINT_LEAST16_FMTX__ "hX"
+#define __UINT_LEAST32_FMTX__ "X"
+#define __UINT_LEAST64_FMTX__ __PRI64 "X"
+#define __UINT_FAST8_FMTX__ "hhX"
+#define __UINT_FAST16_FMTX__ "hX"
+#define __UINT_FAST32_FMTX__ "X"
+#define __UINT_FAST64_FMTX__ __PRI64 "X"
+#define __UINTMAX_FMTX__ __PRI64 "X"
+#define __UINTPTR_FMTX__ __PRIPTR "X"
+#endif
+
+// only recent clang provides these macros, so we need to check if they are
+// available.
+#ifndef __UINT8_FMTb__
+#define __UINT8_FMTb__ "hhb"
+#endif
+#ifndef __UINT16_FMTb__
+#define __UINT16_FMTb__ "hb"
+#endif
+#ifndef __UINT32_FMTb__
+#define __UINT32_FMTb__ "b"
+#endif
+#ifndef __UINT64_FMTb__
+#define __UINT64_FMTb__ __PRI64 "b"
+#endif
+#ifndef __UINT_LEAST8_FMTb__
+#define __UINT_LEAST8_FMTb__ "hhb"
+#endif
+#ifndef __UINT_LEAST16_FMTb__
+#define __UINT_LEAST16_FMTb__ "hb"
+#endif
+#ifndef __UINT_LEAST32_FMTb__
+#define __UINT_LEAST32_FMTb__ "b"
+#endif
+#ifndef __UINT_LEAST64_FMTb__
+#define __UINT_LEAST64_FMTb__ __PRI64 "b"
+#endif
+#ifndef __UINT_FAST8_FMTb__
+#define __UINT_FAST8_FMTb__ "hhb"
+#endif
+#ifndef __UINT_FAST16_FMTb__
+#define __UINT_FAST16_FMTb__ "hb"
+#endif
+#ifndef __UINT_FAST32_FMTb__
+#define __UINT_FAST32_FMTb__ "b"
+#endif
+#ifndef __UINT_FAST64_FMTb__
+#define __UINT_FAST64_FMTb__ __PRI64 "b"
+#endif
+#ifndef __UINTMAX_FMTb__
+#define __UINTMAX_FMTb__ __PRI64 "b"
+#endif
+#ifndef __UINTPTR_FMTb__
+#define __UINTPTR_FMTb__ __PRIPTR "b"
+#endif
+
+#ifndef __UINT8_FMTB__
+#define __UINT8_FMTB__ "hhB"
+#endif
+#ifndef __UINT16_FMTB__
+#define __UINT16_FMTB__ "hB"
+#endif
+#ifndef __UINT32_FMTB__
+#define __UINT32_FMTB__ "B"
+#endif
+#ifndef __UINT64_FMTB__
+#define __UINT64_FMTB__ __PRI64 "B"
+#endif
+#ifndef __UINT_LEAST8_FMTB__
+#define __UINT_LEAST8_FMTB__ "hhB"
+#endif
+#ifndef __UINT_LEAST16_FMTB__
+#define __UINT_LEAST16_FMTB__ "hB"
+#endif
+#ifndef __UINT_LEAST32_FMTB__
+#define __UINT_LEAST32_FMTB__ "B"
+#endif
+#ifndef __UINT_LEAST64_FMTB__
+#define __UINT_LEAST64_FMTB__ __PRI64 "B"
+#endif
+#ifndef __UINT_FAST8_FMTB__
+#define __UINT_FAST8_FMTB__ "hhB"
+#endif
+#ifndef __UINT_FAST16_FMTB__
+#define __UINT_FAST16_FMTB__ "hB"
+#endif
+#ifndef __UINT_FAST32_FMTB__
+#define __UINT_FAST32_FMTB__ "B"
+#endif
+#ifndef __UINT_FAST64_FMTB__
+#define __UINT_FAST64_FMTB__ __PRI64 "B"
+#endif
+#ifndef __UINTMAX_FMTB__
+#define __UINTMAX_FMTB__ __PRI64 "B"
+#endif
+#ifndef __UINTPTR_FMTB__
+#define __UINTPTR_FMTB__ __PRIPTR "B"
+#endif
+
+// The fprintf() macros for signed integers.
+#define PRId8 __INT8_FMTd__
+#define PRId16 __INT16_FMTd__
+#define PRId32 __INT32_FMTd__
+#define PRId64 __INT64_FMTd__
+#define PRIdLEAST8 __INT_LEAST8_FMTd__
+#define PRIdLEAST16 __INT_LEAST16_FMTd__
+#define PRIdLEAST32 __INT_LEAST32_FMTd__
+#define PRIdLEAST64 __INT_LEAST64_FMTd__
+#define PRIdFAST8 __INT_FAST8_FMTd__
+#define PRIdFAST16 __INT_FAST16_FMTd__
+#define PRIdFAST32 __INT_FAST32_FMTd__
+#define PRIdFAST64 __INT_FAST64_FMTd__
+#define PRIdMAX __INTMAX_FMTd__
+#define PRIdPTR __INTPTR_FMTd__
+
+#define PRIi8 __INT8_FMTi__
+#define PRIi16 __INT16_FMTi__
+#define PRIi32 __INT32_FMTi__
+#define PRIi64 __INT64_FMTi__
+#define PRIiLEAST8 __INT_LEAST8_FMTi__
+#define PRIiLEAST16 __INT_LEAST16_FMTi__
+#define PRIiLEAST32 __INT_LEAST32_FMTi__
+#define PRIiLEAST64 __INT_LEAST64_FMTi__
+#define PRIiFAST8 __INT_FAST8_FMTi__
+#define PRIiFAST16 __INT_FAST16_FMTi__
+#define PRIiFAST32 __INT_FAST32_FMTi__
+#define PRIiFAST64 __INT_FAST64_FMTi__
+#define PRIiMAX __INTMAX_FMTi__
+#define PRIiPTR __INTPTR_FMTi__
+
+// The fprintf() macros for unsigned integers.
+#define PRIo8 __UINT8_FMTo__
+#define PRIo16 __UINT16_FMTo__
+#define PRIo32 __UINT32_FMTo__
+#define PRIo64 __UINT64_FMTo__
+#define PRIoLEAST8 __UINT_LEAST8_FMTo__
+#define PRIoLEAST16 __UINT_LEAST16_FMTo__
+#define PRIoLEAST32 __UINT_LEAST32_FMTo__
+#define PRIoLEAST64 __UINT_LEAST64_FMTo__
+#define PRIoFAST8 __UINT_FAST8_FMTo__
+#define PRIoFAST16 __UINT_FAST16_FMTo__
+#define PRIoFAST32 __UINT_FAST32_FMTo__
+#define PRIoFAST64 __UINT_FAST64_FMTo__
+#define PRIoMAX __UINTMAX_FMTo__
+#define PRIoPTR __UINTPTR_FMTo__
+
+#define PRIu8 __UINT8_FMTu__
+#define PRIu16 __UINT16_FMTu__
+#define PRIu32 __UINT32_FMTu__
+#define PRIu64 __UINT64_FMTu__
+#define PRIuLEAST8 __UINT_LEAST8_FMTu__
+#define PRIuLEAST16 __UINT_LEAST16_FMTu__
+#define PRIuLEAST32 __UINT_LEAST32_FMTu__
+#define PRIuLEAST64 __UINT_LEAST64_FMTu__
+#define PRIuFAST8 __UINT_FAST8_FMTu__
+#define PRIuFAST16 __UINT_FAST16_FMTu__
+#define PRIuFAST32 __UINT_FAST32_FMTu__
+#define PRIuFAST64 __UINT_FAST64_FMTu__
+#define PRIuMAX __UINTMAX_FMTu__
+#define PRIuPTR __UINTPTR_FMTu__
+
+#define PRIx8 __UINT8_FMTx__
+#define PRIx16 __UINT16_FMTx__
+#define PRIx32 __UINT32_FMTx__
+#define PRIx64 __UINT64_FMTx__
+#define PRIxLEAST8 __UINT_LEAST8_FMTx__
+#define PRIxLEAST16 __UINT_LEAST16_FMTx__
+#define PRIxLEAST32 __UINT_LEAST32_FMTx__
+#define PRIxLEAST64 __UINT_LEAST64_FMTx__
+#define PRIxFAST8 __UINT_FAST8_FMTx__
+#define PRIxFAST16 __UINT_FAST16_FMTx__
+#define PRIxFAST32 __UINT_FAST32_FMTx__
+#define PRIxFAST64 __UINT_FAST64_FMTx__
+#define PRIxMAX __UINTMAX_FMTx__
+#define PRIxPTR __UINTPTR_FMTx__
+
+#define PRIX8 __UINT8_FMTX__
+#define PRIX16 __UINT16_FMTX__
+#define PRIX32 __UINT32_FMTX__
+#define PRIX64 __UINT64_FMTX__
+#define PRIXLEAST8 __UINT_LEAST8_FMTX__
+#define PRIXLEAST16 __UINT_LEAST16_FMTX__
+#define PRIXLEAST32 __UINT_LEAST32_FMTX__
+#define PRIXLEAST64 __UINT_LEAST64_FMTX__
+#define PRIXFAST8 __UINT_FAST8_FMTX__
+#define PRIXFAST16 __UINT_FAST16_FMTX__
+#define PRIXFAST32 __UINT_FAST32_FMTX__
+#define PRIXFAST64 __UINT_FAST64_FMTX__
+#define PRIXMAX __UINTMAX_FMTX__
+#define PRIXPTR __UINTPTR_FMTX__
+
+#define PRIb8 __UINT8_FMTb__
+#define PRIb16 __UINT16_FMTb__
+#define PRIb32 __UINT32_FMTb__
+#define PRIb64 __UINT64_FMTb__
+#define PRIbLEAST8 __UINT_LEAST8_FMTb__
+#define PRIbLEAST16 __UINT_LEAST16_FMTb__
+#define PRIbLEAST32 __UINT_LEAST32_FMTb__
+#define PRIbLEAST64 __UINT_LEAST64_FMTb__
+#define PRIbFAST8 __UINT_FAST8_FMTb__
+#define PRIbFAST16 __UINT_FAST16_FMTb__
+#define PRIbFAST32 __UINT_FAST32_FMTb__
+#define PRIbFAST64 __UINT_FAST64_FMTb__
+#define PRIbMAX __UINTMAX_FMTb__
+#define PRIbPTR __UINTPTR_FMTb__
+
+#define PRIB8 __UINT8_FMTB__
+#define PRIB16 __UINT16_FMTB__
+#define PRIB32 __UINT32_FMTB__
+#define PRIB64 __UINT64_FMTB__
+#define PRIBLEAST8 __UINT_LEAST8_FMTB__
+#define PRIBLEAST16 __UINT_LEAST16_FMTB__
+#define PRIBLEAST32 __UINT_LEAST32_FMTB__
+#define PRIBLEAST64 __UINT_LEAST64_FMTB__
+#define PRIBFAST8 __UINT_FAST8_FMTB__
+#define PRIBFAST16 __UINT_FAST16_FMTB__
+#define PRIBFAST32 __UINT_FAST32_FMTB__
+#define PRIBFAST64 __UINT_FAST64_FMTB__
+#define PRIBMAX __UINTMAX_FMTB__
+#define PRIBPTR __UINTPTR_FMTB__
+
+// The fscanf() macros for signed integers.
+#define SCNd8 __INT8_FMTd__
+#define SCNd16 __INT16_FMTd__
+#define SCNd32 __INT32_FMTd__
+#define SCNd64 __INT64_FMTd__
+#define SCNdLEAST8 __INT_LEAST8_FMTd__
+#define SCNdLEAST16 __INT_LEAST16_FMTd__
+#define SCNdLEAST32 __INT_LEAST32_FMTd__
+#define SCNdLEAST64 __INT_LEAST64_FMTd__
+#define SCNdFAST8 __INT_FAST8_FMTd__
+#define SCNdFAST16 __INT_FAST16_FMTd__
+#define SCNdFAST32 __INT_FAST32_FMTd__
+#define SCNdFAST64 __INT_FAST64_FMTd__
+#define SCNdMAX __INTMAX_FMTd__
+#define SCNdPTR __INTPTR_FMTd__
+
+#define SCNi8 __INT8_FMTi__
+#define SCNi16 __INT16_FMTi__
+#define SCNi32 __INT32_FMTi__
+#define SCNi64 __INT64_FMTi__
+#define SCNiLEAST8 __INT_LEAST8_FMTi__
+#define SCNiLEAST16 __INT_LEAST16_FMTi__
+#define SCNiLEAST32 __INT_LEAST32_FMTi__
+#define SCNiLEAST64 __INT_LEAST64_FMTi__
+#define SCNiFAST8 __INT_FAST8_FMTi__
+#define SCNiFAST16 __INT_FAST16_FMTi__
+#define SCNiFAST32 __INT_FAST32_FMTi__
+#define SCNiFAST64 __INT_FAST64_FMTi__
+#define SCNiMAX __INTMAX_FMTi__
+#define SCNiPTR __INTPTR_FMTi__
+
+// The fscanf() macros for unsigned integers.
+#define SCNo8 __UINT8_FMTo__
+#define SCNo16 __UINT16_FMTo__
+#define SCNo32 __UINT32_FMTo__
+#define SCNo64 __UINT64_FMTo__
+#define SCNoLEAST8 __UINT_LEAST8_FMTo__
+#define SCNoLEAST16 __UINT_LEAST16_FMTo__
+#define SCNoLEAST32 __UINT_LEAST32_FMTo__
+#define SCNoLEAST64 __UINT_LEAST64_FMTo__
+#define SCNoFAST8 __UINT_FAST8_FMTo__
+#define SCNoFAST16 __UINT_FAST16_FMTo__
+#define SCNoFAST32 __UINT_FAST32_FMTo__
+#define SCNoFAST64 __UINT_FAST64_FMTo__
+#define SCNoMAX __UINTMAX_FMTo__
+#define SCNoPTR __UINTPTR_FMTo__
+
+#define SCNu8 __UINT8_FMTu__
+#define SCNu16 __UINT16_FMTu__
+#define SCNu32 __UINT32_FMTu__
+#define SCNu64 __UINT64_FMTu__
+#define SCNuLEAST8 __UINT_LEAST8_FMTu__
+#define SCNuLEAST16 __UINT_LEAST16_FMTu__
+#define SCNuLEAST32 __UINT_LEAST32_FMTu__
+#define SCNuLEAST64 __UINT_LEAST64_FMTu__
+#define SCNuFAST8 __UINT_FAST8_FMTu__
+#define SCNuFAST16 __UINT_FAST16_FMTu__
+#define SCNuFAST32 __UINT_FAST32_FMTu__
+#define SCNuFAST64 __UINT_FAST64_FMTu__
+#define SCNuMAX __UINTMAX_FMTu__
+#define SCNuPTR __UINTPTR_FMTu__
+
+#define SCNx8 __UINT8_FMTx__
+#define SCNx16 __UINT16_FMTx__
+#define SCNx32 __UINT32_FMTx__
+#define SCNx64 __UINT64_FMTx__
+#define SCNxLEAST8 __UINT_LEAST8_FMTx__
+#define SCNxLEAST16 __UINT_LEAST16_FMTx__
+#define SCNxLEAST32 __UINT_LEAST32_FMTx__
+#define SCNxLEAST64 __UINT_LEAST64_FMTx__
+#define SCNxFAST8 __UINT_FAST8_FMTx__
+#define SCNxFAST16 __UINT_FAST16_FMTx__
+#define SCNxFAST32 __UINT_FAST32_FMTx__
+#define SCNxFAST64 __UINT_FAST64_FMTx__
+#define SCNxMAX __UINTMAX_FMTx__
+#define SCNxPTR __UINTPTR_FMTx__
+
+#define SCNb8 __UINT8_FMTb__
+#define SCNb16 __UINT16_FMTb__
+#define SCNb32 __UINT32_FMTb__
+#define SCNb64 __UINT64_FMTb__
+#define SCNbLEAST8 __UINT_LEAST8_FMTb__
+#define SCNbLEAST16 __UINT_LEAST16_FMTb__
+#define SCNbLEAST32 __UINT_LEAST32_FMTb__
+#define SCNbLEAST64 __UINT_LEAST64_FMTb__
+#define SCNbFAST8 __UINT_FAST8_FMTb__
+#define SCNbFAST16 __UINT_FAST16_FMTb__
+#define SCNbFAST32 __UINT_FAST32_FMTb__
+#define SCNbFAST64 __UINT_FAST64_FMTb__
+#define SCNbMAX __UINTMAX_FMTb__
+#define SCNbPTR __UINTPTR_FMTb__
+
+#endif // LLVM_LIBC_MACROS_INTTYPES_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/limits-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/limits-macros.h
new file mode 100644
index 000000000000..79bbbe401eb0
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/limits-macros.h
@@ -0,0 +1,246 @@
+//===-- Definition of macros from limits.h --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LIMITS_MACROS_H
+#define LLVM_LIBC_MACROS_LIMITS_MACROS_H
+
+// Define all C23 macro constants of limits.h
+
+#ifndef CHAR_BIT
+#ifdef __CHAR_BIT__
+#define CHAR_BIT __CHAR_BIT__
+#else
+#define CHAR_BIT 8
+#endif // __CHAR_BIT__
+#endif // CHAR_BIT
+
+#ifndef MB_LEN_MAX
+// Represents a single UTF-32 wide character in the default locale.
+#define MB_LEN_MAX 4
+#endif // MB_LEN_MAX
+
+// *_WIDTH macros
+
+#ifndef CHAR_WIDTH
+#define CHAR_WIDTH CHAR_BIT
+#endif // CHAR_WIDTH
+
+#ifndef SCHAR_WIDTH
+#define SCHAR_WIDTH CHAR_BIT
+#endif // SCHAR_WIDTH
+
+#ifndef UCHAR_WIDTH
+#define UCHAR_WIDTH CHAR_BIT
+#endif // UCHAR_WIDTH
+
+#ifndef SHRT_WIDTH
+#ifdef __SHRT_WIDTH__
+#define SHRT_WIDTH __SHRT_WIDTH__
+#else
+#define SHRT_WIDTH 16
+#endif // __SHRT_WIDTH__
+#endif // SHRT_WIDTH
+
+#ifndef USHRT_WIDTH
+#define USHRT_WIDTH SHRT_WIDTH
+#endif // USHRT_WIDTH
+
+#ifndef INT_WIDTH
+#ifdef __INT_WIDTH__
+#define INT_WIDTH __INT_WIDTH__
+#else
+#define INT_WIDTH 32
+#endif // __INT_WIDTH__
+#endif // INT_WIDTH
+
+#ifndef UINT_WIDTH
+#define UINT_WIDTH INT_WIDTH
+#endif // UINT_WIDTH
+
+#ifndef LONG_WIDTH
+#ifdef __LONG_WIDTH__
+#define LONG_WIDTH __LONG_WIDTH__
+#elif defined(__WORDSIZE)
+#define LONG_WIDTH __WORDSIZE
+#else
+// Use __SIZEOF_LONG__ * CHAR_BIT as backup.  This is needed for clang-13 or
+// before.
+#define LONG_WIDTH (__SIZEOF_LONG__ * CHAR_BIT)
+#endif // __LONG_WIDTH__
+#endif // LONG_WIDTH
+
+#ifndef ULONG_WIDTH
+#define ULONG_WIDTH LONG_WIDTH
+#endif // ULONG_WIDTH
+
+#ifndef LLONG_WIDTH
+#ifdef __LLONG_WIDTH__
+#define LLONG_WIDTH __LLONG_WIDTH__
+#else
+#define LLONG_WIDTH 64
+#endif // __LLONG_WIDTH__
+#endif // LLONG_WIDTH
+
+#ifndef ULLONG_WIDTH
+#define ULLONG_WIDTH LLONG_WIDTH
+#endif // ULLONG_WIDTH
+
+#ifndef BOOL_WIDTH
+#ifdef __BOOL_WIDTH__
+#define BOOL_WIDTH __BOOL_WIDTH__
+#else
+#define BOOL_WIDTH 1
+#endif // __BOOL_WIDTH__
+#endif // BOOL_WIDTH
+
+// *_MAX macros
+
+#ifndef SCHAR_MAX
+#ifdef __SCHAR_MAX__
+#define SCHAR_MAX __SCHAR_MAX__
+#else
+#define SCHAR_MAX 0x7f
+#endif // __SCHAR_MAX__
+#endif // SCHAR_MAX
+
+#ifndef UCHAR_MAX
+#define UCHAR_MAX (SCHAR_MAX * 2 + 1)
+#endif // UCHAR_MAX
+
+// Check if char is unsigned.
+#if !defined(__CHAR_UNSIGNED__) && ('\xff' > 0)
+#define __CHAR_UNSIGNED__
+#endif
+
+#ifndef CHAR_MAX
+#ifdef __CHAR_UNSIGNED__
+#define CHAR_MAX UCHAR_MAX
+#else
+#define CHAR_MAX SCHAR_MAX
+#endif // __CHAR_UNSIGNED__
+#endif // CHAR_MAX
+
+#ifndef SHRT_MAX
+#ifdef __SHRT_MAX__
+#define SHRT_MAX __SHRT_MAX__
+#else
+#define SHRT_MAX 0x7fff
+#endif // __SHRT_MAX__
+#endif // SHRT_MAX
+
+#ifndef USHRT_MAX
+#define USHRT_MAX (SHRT_MAX * 2U + 1U)
+#endif // USHRT_MAX
+
+#ifndef INT_MAX
+#ifdef __INT_MAX__
+#define INT_MAX __INT_MAX__
+#else
+#define INT_MAX (0 ^ (1 << (INT_WIDTH - 1)))
+#endif // __INT_MAX__
+#endif // INT_MAX
+
+#ifndef UINT_MAX
+#define UINT_MAX (INT_MAX * 2U + 1U)
+#endif // UINT_MAX
+
+#ifndef LONG_MAX
+#ifdef __LONG_MAX__
+#define LONG_MAX __LONG_MAX__
+#else
+#define LONG_MAX (0L ^ (1L << (LONG_WIDTH - 1)))
+#endif // __LONG_MAX__
+#endif // LONG_MAX
+
+#ifndef ULONG_MAX
+#define ULONG_MAX (LONG_MAX * 2UL + 1UL)
+#endif // ULONG_MAX
+
+#ifndef LLONG_MAX
+#ifdef __LONG_LONG_MAX__
+#define LLONG_MAX __LONG_LONG_MAX__
+#else
+#define LLONG_MAX (0LL ^ (1LL << (LLONG_WIDTH - 1)))
+#endif // __LONG_LONG_MAX__
+#endif // LLONG_MAX
+
+#ifndef ULLONG_MAX
+#define ULLONG_MAX (LLONG_MAX * 2ULL + 1ULL)
+#endif // ULLONG_MAX
+
+// *_MIN macros
+
+#ifndef SCHAR_MIN
+#define SCHAR_MIN (-SCHAR_MAX - 1)
+#endif // SCHAR_MIN
+
+#ifndef UCHAR_MIN
+#define UCHAR_MIN 0
+#endif // UCHAR_MIN
+
+#ifndef CHAR_MIN
+#ifdef __CHAR_UNSIGNED__
+#define CHAR_MIN UCHAR_MIN
+#else
+#define CHAR_MIN SCHAR_MIN
+#endif // __CHAR_UNSIGNED__
+#endif // CHAR_MIN
+
+#ifndef SHRT_MIN
+#define SHRT_MIN (-SHRT_MAX - 1)
+#endif // SHRT_MIN
+
+#ifndef USHRT_MIN
+#define USHRT_MIN 0U
+#endif // USHRT_MIN
+
+#ifndef INT_MIN
+#define INT_MIN (-INT_MAX - 1)
+#endif // INT_MIN
+
+#ifndef UINT_MIN
+#define UINT_MIN 0U
+#endif // UINT_MIN
+
+#ifndef LONG_MIN
+#define LONG_MIN (-LONG_MAX - 1L)
+#endif // LONG_MIN
+
+#ifndef ULONG_MIN
+#define ULONG_MIN 0UL
+#endif // ULONG_MIN
+
+#ifndef LLONG_MIN
+#define LLONG_MIN (-LLONG_MAX - 1LL)
+#endif // LLONG_MIN
+
+#ifndef ULLONG_MIN
+#define ULLONG_MIN 0ULL
+#endif // ULLONG_MIN
+
+#ifndef _POSIX_MAX_CANON
+#define _POSIX_MAX_CANON 255
+#endif
+
+#ifndef _POSIX_MAX_INPUT
+#define _POSIX_MAX_INPUT 255
+#endif
+
+#ifndef _POSIX_NAME_MAX
+#define _POSIX_PATH_MAX 256
+#endif
+
+#ifndef _POSIX_ARG_MAX
+#define _POSIX_ARG_MAX 4096
+#endif
+
+#ifndef IOV_MAX
+#define IOV_MAX 1024
+#endif // IOV_MAX
+
+#endif // LLVM_LIBC_MACROS_LIMITS_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/link-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/link-macros.h
new file mode 100644
index 000000000000..89e7bb50aa55
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/link-macros.h
@@ -0,0 +1,20 @@
+//===-- Definition of macros to for extra dynamic linker functionality ----===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LINK_MACROS_H
+#define LLVM_LIBC_MACROS_LINK_MACROS_H
+
+#include "elf-macros.h"
+
+#ifdef __LP64__
+#define ElfW(type) Elf64_##type
+#else
+#define ElfW(type) Elf32_##type
+#endif
+
+#endif
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/linux/error-number-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/error-number-macros.h
new file mode 100644
index 000000000000..9a7304fa161a
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/error-number-macros.h
@@ -0,0 +1,32 @@
+#ifndef LLVM_LIBC_MACROS_LINUX_ERROR_NUMBER_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_ERROR_NUMBER_MACROS_H
+
+#ifndef ECANCELED
+#define ECANCELED 125
+#endif // ECANCELED
+
+#ifndef EOWNERDEAD
+#define EOWNERDEAD 130
+#endif // EOWNERDEAD
+
+#ifndef ENOTRECOVERABLE
+#define ENOTRECOVERABLE 131
+#endif // ENOTRECOVERABLE
+
+#ifndef ERFKILL
+#define ERFKILL 132
+#endif // ERFKILL
+
+#ifndef EHWPOISON
+#define EHWPOISON 133
+#endif // EHWPOISON
+
+#ifndef EOPNOTSUPP
+#define EOPNOTSUPP 95
+#endif
+
+#ifndef ENOTSUP
+#define ENOTSUP EOPNOTSUPP
+#endif
+
+#endif // LLVM_LIBC_MACROS_LINUX_ERROR_NUMBER_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/linux/fcntl-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/fcntl-macros.h
new file mode 100644
index 000000000000..aec8a0d2da0b
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/fcntl-macros.h
@@ -0,0 +1,105 @@
+//===-- Definition of macros from fcntl.h ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LINUX_FCNTL_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_FCNTL_MACROS_H
+
+// File creation flags
+#define O_CLOEXEC 02000000
+#define O_CREAT 00000100
+#define O_PATH 010000000
+
+#ifdef __aarch64__
+#define O_DIRECTORY 040000
+#else
+#define O_DIRECTORY 00200000
+#endif
+
+#define O_EXCL 00000200
+#define O_NOCTTY 00000400
+
+#ifdef __aarch64__
+#define O_NOFOLLOW 0100000
+#else
+#define O_NOFOLLOW 00400000
+#endif
+
+#define O_TRUNC 00001000
+#define O_TMPFILE (020000000 | O_DIRECTORY)
+
+// File status flags
+#define O_APPEND 00002000
+#define O_DSYNC 00010000
+#define O_NONBLOCK 00004000
+#define O_SYNC 04000000 | O_DSYNC
+
+// File access mode mask
+#define O_ACCMODE 00000003
+
+// File access mode flags
+#define O_RDONLY 00000000
+#define O_RDWR 00000002
+#define O_WRONLY 00000001
+
+// Special directory FD to indicate that the path argument to
+// openat is relative to the current directory.
+#define AT_FDCWD -100
+
+// Special flag to the function unlinkat to indicate that it
+// has to perform the equivalent of "rmdir" on the path argument.
+#define AT_REMOVEDIR 0x200
+
+// Special flag for functions like lstat to convey that symlinks
+// should not be followed.
+#define AT_SYMLINK_NOFOLLOW 0x100
+
+// Allow empty relative pathname.
+#define AT_EMPTY_PATH 0x1000
+
+// Values of SYS_fcntl commands.
+#define F_DUPFD 0
+#define F_GETFD 1
+#define F_SETFD 2
+#define F_GETFL 3
+#define F_SETFL 4
+#define F_GETLK 5
+#define F_SETLK 6
+#define F_SETLKW 7
+#define F_SETOWN 8
+#define F_GETOWN 9
+#define F_SETSIG 10
+#define F_GETSIG 11
+#define F_GETLK64 12
+#define F_SETLK64 13
+#define F_SETLKW64 14
+#define F_SETOWN_EX 15
+#define F_GETOWN_EX 16
+
+// Open File Description Locks.
+#define F_OFD_GETLK 36
+#define F_OFD_SETLK 37
+#define F_OFD_SETLKW 38
+
+// Close on succesful
+#define F_CLOEXEC 1
+
+// Close on execute for fcntl.
+#define FD_CLOEXEC 1
+
+#define F_RDLCK 0
+#define F_WRLCK 1
+#define F_UNLCK 2
+
+// For Large File Support
+#if defined(_LARGEFILE64_SOURCE)
+#define F_GETLK F_GETLK64
+#define F_SETLK F_SETLK64
+#define F_SETLKW F_SETLKW64
+#endif
+
+#endif // LLVM_LIBC_MACROS_LINUX_FCNTL_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/linux/poll-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/poll-macros.h
new file mode 100644
index 000000000000..d6724c5ee321
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/poll-macros.h
@@ -0,0 +1,65 @@
+//===-- Macros defined in poll.h header file ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LINUX_POLL_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_POLL_MACROS_H
+
+// From asm-generic/poll.h, redefined here to avoid redeclaring struct pollfd.
+#ifndef POLLIN
+#define POLLIN 0x0001
+#endif
+
+#ifndef POLLPRI
+#define POLLPRI 0x0002
+#endif
+
+#ifndef POLLOUT
+#define POLLOUT 0x0004
+#endif
+
+#ifndef POLLERR
+#define POLLERR 0x0008
+#endif
+
+#ifndef POLLHUP
+#define POLLHUP 0x0010
+#endif
+
+#ifndef POLLNVAL
+#define POLLNVAL 0x0020
+#endif
+
+#ifndef POLLRDNORM
+#define POLLRDNORM 0x0040
+#endif
+
+#ifndef POLLRDBAND
+#define POLLRDBAND 0x0080
+#endif
+
+#ifndef POLLWRNORM
+#define POLLWRNORM 0x0100
+#endif
+
+#ifndef POLLWRBAND
+#define POLLWRBAND 0x0200
+#endif
+
+#ifndef POLLMSG
+#define POLLMSG 0x0400
+#endif
+
+#ifndef POLLREMOVE
+#define POLLREMOVE 0x1000
+#endif
+
+#ifndef POLLRDHUP
+#define POLLRDHUP 0x2000
+#endif
+
+#endif // LLVM_LIBC_MACROS_LINUX_POLL_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sched-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sched-macros.h
new file mode 100644
index 000000000000..597789bb4ce2
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sched-macros.h
@@ -0,0 +1,37 @@
+//===-- Definition of macros from sched.h ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LINUX_SCHED_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_SCHED_MACROS_H
+
+// Definitions of SCHED_* macros must match was linux as at:
+// https://elixir.bootlin.com/linux/latest/source/include/uapi/linux/sched.h
+
+// Posix required
+#define SCHED_OTHER 0
+#define SCHED_FIFO 1
+#define SCHED_RR 2
+
+// Linux extentions
+#define SCHED_BATCH 3
+#define SCHED_ISO 4 // Not yet implemented, reserved.
+#define SCHED_IDLE 5
+#define SCHED_DEADLINE 6
+
+#define CPU_SETSIZE __CPU_SETSIZE
+#define NCPUBITS __NCPUBITS
+#define CPU_COUNT_S(setsize, set) __sched_getcpucount(setsize, set)
+#define CPU_COUNT(set) CPU_COUNT_S(sizeof(cpu_set_t), set)
+#define CPU_ZERO_S(setsize, set) __sched_setcpuzero(setsize, set)
+#define CPU_ZERO(set) CPU_ZERO_S(sizeof(cpu_set_t), set)
+#define CPU_SET_S(cpu, setsize, set) __sched_setcpuset(cpu, setsize, set)
+#define CPU_SET(cpu, setsize, set) CPU_SET_S(cpu, sizeof(cpt_set_t), set)
+#define CPU_ISSET_S(cpu, setsize, set) __sched_getcpuisset(cpu, setsize, set)
+#define CPU_ISSET(cpu, setsize, set) CPU_ISSET_S(cpu, sizeof(cpt_set_t), set)
+
+#endif // LLVM_LIBC_MACROS_LINUX_SCHED_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/linux/signal-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/signal-macros.h
new file mode 100644
index 000000000000..d220241a3820
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/signal-macros.h
@@ -0,0 +1,101 @@
+//===-- Definition of Linux signal number macros --------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LINUX_SIGNAL_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_SIGNAL_MACROS_H
+
+#define SIGHUP 1
+#define SIGINT 2
+#define SIGQUIT 3
+#define SIGILL 4
+#define SIGTRAP 5
+#define SIGABRT 6
+#define SIGIOT 6
+#define SIGBUS 7
+#define SIGFPE 8
+#define SIGKILL 9
+#define SIGUSR1 10
+#define SIGSEGV 11
+#define SIGUSR2 12
+#define SIGPIPE 13
+#define SIGALRM 14
+#define SIGTERM 15
+#define SIGSTKFLT 16
+#define SIGCHLD 17
+#define SIGCONT 18
+#define SIGSTOP 19
+#define SIGTSTP 20
+#define SIGTTIN 21
+#define SIGTTOU 22
+#define SIGURG 23
+#define SIGXCPU 24
+#define SIGXFSZ 25
+#define SIGVTALRM 26
+#define SIGPROF 27
+#define SIGWINCH 28
+#define SIGIO 29
+#define SIGPOLL SIGIO
+#define SIGPWR 30
+#define SIGSYS 31
+
+// Max signal number
+#define NSIG 64
+
+// SIGRTMIN is current set to the minimum usable from user mode programs. If
+// the libc itself uses some of these signal numbers for private operations,
+// then it has to be adjusted in future to reflect that.
+#define SIGRTMIN 32
+
+#define SIGRTMAX NSIG
+
+// The kernel sigset is stored as an array of long values. Each bit of this
+// array corresponds to a signal, adjusted by 1. That is, bit 0 corresponds
+// to signal number 1, bit 1 corresponds to signal number 2 and so on. The
+// below macro denotes the size of that array (in number of long words and
+// not bytes).
+#define __NSIGSET_WORDS (NSIG / (sizeof(unsigned long) * 8))
+
+#define SIG_BLOCK 0   // For blocking signals
+#define SIG_UNBLOCK 1 // For unblocking signals
+#define SIG_SETMASK 2 // For setting signal mask
+
+// Flag values to be used for setting sigaction.sa_flags.
+#define SA_NOCLDSTOP 0x00000001
+#define SA_NOCLDWAIT 0x00000002
+#define SA_SIGINFO 0x00000004
+#define SA_RESTART 0x10000000
+#define SA_RESTORER 0x04000000
+#define SA_ONSTACK 0x08000000
+
+// Signal stack flags
+#define SS_ONSTACK 0x1
+#define SS_DISABLE 0x2
+
+#if defined(__x86_64__) || defined(__i386__) || defined(__riscv)
+#define MINSIGSTKSZ 2048
+#define SIGSTKSZ 8192
+#elif defined(__aarch64__)
+#define MINSIGSTKSZ 5120
+#define SIGSTKSZ 16384
+#else
+#error "Signal stack sizes not defined for your platform."
+#endif
+
+#define SIG_DFL ((void (*)(int))0)
+#define SIG_IGN ((void (*)(int))1)
+#define SIG_ERR ((void (*)(int))(-1))
+
+// SIGCHLD si_codes
+#define CLD_EXITED 1    // child has exited
+#define CLD_KILLED 2    // child was killed
+#define CLD_DUMPED 3    // child terminated abnormally
+#define CLD_TRAPPED 4   // traced child has trapped
+#define CLD_STOPPED 5   // child has stopped
+#define CLD_CONTINUED 6 // stopped child has continued
+
+#endif // LLVM_LIBC_MACROS_LINUX_SIGNAL_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-epoll-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-epoll-macros.h
new file mode 100644
index 000000000000..f73d690908fd
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-epoll-macros.h
@@ -0,0 +1,40 @@
+//===-- Macros defined in sys/epoll.h header file -------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LINUX_SYS_EPOLL_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_SYS_EPOLL_MACROS_H
+
+#include "fcntl-macros.h"
+
+// These are also defined in <linux/eventpoll.h> but that also contains a
+// different definition of the epoll_event struct that is different from the
+// userspace version.
+
+#define EPOLL_CLOEXEC O_CLOEXEC
+
+#define EPOLL_CTL_ADD 1
+#define EPOLL_CTL_DEL 2
+#define EPOLL_CTL_MOD 3
+
+#define EPOLLIN 0x1
+#define EPOLLPRI 0x2
+#define EPOLLOUT 0x4
+#define EPOLLERR 0x8
+#define EPOLLHUP 0x10
+#define EPOLLRDNORM 0x40
+#define EPOLLRDBAND 0x80
+#define EPOLLWRNORM 0x100
+#define EPOLLWRBAND 0x200
+#define EPOLLMSG 0x400
+#define EPOLLRDHUP 0x2000
+#define EPOLLEXCLUSIVE 0x10000000
+#define EPOLLWAKEUP 0x20000000
+#define EPOLLONESHOT 0x40000000
+#define EPOLLET 0x80000000
+
+#endif // LLVM_LIBC_MACROS_LINUX_SYS_EPOLL_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-ioctl-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-ioctl-macros.h
new file mode 100644
index 000000000000..41226080084c
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-ioctl-macros.h
@@ -0,0 +1,20 @@
+//===-- Definition of macros from sys/ioctl.h -----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LINUX_SYS_IOCTL_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_SYS_IOCTL_MACROS_H
+
+// TODO (michaelrj): Finish defining these macros.
+// Just defining this macro for the moment since it's all that we need right
+// now. The other macros are mostly just constants, but there's some complexity
+// around the definitions of macros like _IO, _IOR, _IOW, and _IOWR that I don't
+// think is worth digging into right now.
+#define TIOCGETD 0x5424
+#define FIONREAD 0x541B
+
+#endif // LLVM_LIBC_MACROS_LINUX_SYS_IOCTL_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-random-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-random-macros.h
new file mode 100644
index 000000000000..9261e87bdbf6
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-random-macros.h
@@ -0,0 +1,17 @@
+//===-- Definition of macros from sys/random.h ----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LINUX_SYS_RANDOM_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_SYS_RANDOM_MACROS_H
+
+// Getrandom flags
+#define GRND_RANDOM 0x0001
+#define GRND_NONBLOCK 0x0002
+#define GRND_INSECURE 0x0004
+
+#endif // LLVM_LIBC_MACROS_LINUX_SYS_RANDOM_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-resource-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-resource-macros.h
new file mode 100644
index 000000000000..c9d93c30c35a
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-resource-macros.h
@@ -0,0 +1,31 @@
+//===-- Macros defined in sys/resource.h header file ----------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LINUX_SYS_RESOURCE_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_SYS_RESOURCE_MACROS_H
+
+#define RLIMIT_CPU 0
+#define RLIMIT_FSIZE 1
+#define RLIMIT_DATA 2
+#define RLIMIT_STACK 3
+#define RLIMIT_CORE 4
+#define RLIMIT_RSS 5
+#define RLIMIT_NPROC 6
+#define RLIMIT_NOFILE 7
+#define RLIMIT_MEMLOCK 8
+#define RLIMIT_AS 9
+#define RLIMIT_LOCKS 10
+#define RLIMIT_SIGPENDING 11
+#define RLIMIT_MSGQUEUE 12
+#define RLIMIT_NICE 13
+#define RLIMIT_RTPRIO 14
+#define RLIMIT_RTTIME 15
+
+#define RLIM_INFINITY (~0UL)
+
+#endif // LLVM_LIBC_MACROS_LINUX_SYS_RESOURCE_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-socket-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-socket-macros.h
new file mode 100644
index 000000000000..f335200a103b
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-socket-macros.h
@@ -0,0 +1,28 @@
+//===-- Definition of macros from sys/socket.h ----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LINUX_SYS_SOCKET_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_SYS_SOCKET_MACROS_H
+
+// IEEE Std 1003.1-2017 - basedefs/sys_socket.h.html
+// Macro values come from the Linux syscall interface.
+
+#define AF_UNSPEC 0 // Unspecified
+#define AF_UNIX 1   // Unix domain sockets
+#define AF_LOCAL 1  // POSIX name for AF_UNIX
+#define AF_INET 2   // Internet IPv4 Protocol
+#define AF_INET6 10 // IP version 6
+
+#define SOCK_STREAM 1
+#define SOCK_DGRAM 2
+#define SOCK_RAW 3
+#define SOCK_RDM 4
+#define SOCK_SEQPACKET 5
+#define SOCK_PACKET 10
+
+#endif // LLVM_LIBC_MACROS_LINUX_SYS_SOCKET_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-stat-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-stat-macros.h
new file mode 100644
index 000000000000..3013121d0f3c
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-stat-macros.h
@@ -0,0 +1,48 @@
+//===-- Definition of macros from sys/stat.h ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LINUX_SYS_STAT_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_SYS_STAT_MACROS_H
+
+// Definitions from linux/stat.h
+#define S_IFMT 0170000
+#define S_IFSOCK 0140000
+#define S_IFLNK  0120000
+#define S_IFREG  0100000
+#define S_IFBLK  0060000
+#define S_IFDIR  0040000
+#define S_IFCHR  0020000
+#define S_IFIFO  0010000
+#define S_ISUID  0004000
+#define S_ISGID  0002000
+#define S_ISVTX  0001000
+
+#define S_ISLNK(m)      (((m) & S_IFMT) == S_IFLNK)
+#define S_ISREG(m)      (((m) & S_IFMT) == S_IFREG)
+#define S_ISDIR(m)      (((m) & S_IFMT) == S_IFDIR)
+#define S_ISCHR(m)      (((m) & S_IFMT) == S_IFCHR)
+#define S_ISBLK(m)      (((m) & S_IFMT) == S_IFBLK)
+#define S_ISFIFO(m)     (((m) & S_IFMT) == S_IFIFO)
+#define S_ISSOCK(m)     (((m) & S_IFMT) == S_IFSOCK)
+
+#define S_IRWXU 00700
+#define S_IRUSR 00400
+#define S_IWUSR 00200
+#define S_IXUSR 00100
+
+#define S_IRWXG 00070
+#define S_IRGRP 00040
+#define S_IWGRP 00020
+#define S_IXGRP 00010
+
+#define S_IRWXO 00007
+#define S_IROTH 00004
+#define S_IWOTH 00002
+#define S_IXOTH 00001
+
+#endif // LLVM_LIBC_MACROS_LINUX_SYS_STAT_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-time-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-time-macros.h
new file mode 100644
index 000000000000..e97819594adc
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-time-macros.h
@@ -0,0 +1,53 @@
+//===-- Definition of macros from sys/time.h ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LINUX_SYS_TIME_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_SYS_TIME_MACROS_H
+
+// Add two timevals and put the result in timeval_ptr_result. If the resulting
+// usec value is greater than 999,999 then the microseconds are turned into full
+// seconds (1,000,000 is subtracted from usec and 1 is added to sec).
+#define timeradd(timeval_ptr_a, timeval_ptr_b, timeval_ptr_result)             \
+  (timeval_ptr_result)->tv_sec =                                               \
+      (timeval_ptr_a)->tv_sec + (timeval_ptr_b)->tv_sec +                      \
+      (((timeval_ptr_a)->tv_usec + (timeval_ptr_b)->tv_usec) >= 1000000 ? 1    \
+                                                                        : 0);  \
+  (timeval_ptr_result)->tv_usec =                                              \
+      (timeval_ptr_a)->tv_usec + (timeval_ptr_b)->tv_usec -                    \
+      (((timeval_ptr_a)->tv_usec + (timeval_ptr_b)->tv_usec) >= 1000000        \
+           ? 1000000                                                           \
+           : 0);
+
+// Subtract two timevals and put the result in timeval_ptr_result. If the
+// resulting usec value is less than 0 then 1,000,000 is added to usec and 1 is
+// subtracted from sec.
+#define timersub(timeval_ptr_a, timeval_ptr_b, timeval_ptr_result)             \
+  (timeval_ptr_result)->tv_sec =                                               \
+      (timeval_ptr_a)->tv_sec - (timeval_ptr_b)->tv_sec -                      \
+      (((timeval_ptr_a)->tv_usec - (timeval_ptr_b)->tv_usec) < 0 ? 1 : 0);     \
+  (timeval_ptr_result)->tv_usec =                                              \
+      (timeval_ptr_a)->tv_usec - (timeval_ptr_b)->tv_usec +                    \
+      (((timeval_ptr_a)->tv_usec - (timeval_ptr_b)->tv_usec) < 0 ? 1000000     \
+                                                                 : 0);
+
+// Reset a timeval to the epoch.
+#define timerclear(timeval_ptr)                                                \
+  (timeval_ptr)->tv_sec = 0;                                                   \
+  (timeval_ptr)->tv_usec = 0;
+
+// Determine if a timeval is set to the epoch.
+#define timerisset(timeval_ptr)                                                \
+  (timeval_ptr)->tv_sec != 0 || (timeval_ptr)->tv_usec != 0;
+
+// Compare two timevals using CMP.
+#define timercmp(timeval_ptr_a, timeval_ptr_b, CMP)                            \
+  (((timeval_ptr_a)->tv_sec == (timeval_ptr_b)->tv_sec)                        \
+       ? ((timeval_ptr_a)->tv_usec CMP(timeval_ptr_b)->tv_usec)                \
+       : ((timeval_ptr_a)->tv_sec CMP(timeval_ptr_b)->tv_sec))
+
+#endif // LLVM_LIBC_MACROS_LINUX_SYS_TIME_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-wait-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-wait-macros.h
new file mode 100644
index 000000000000..d01cfa71ba39
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/sys-wait-macros.h
@@ -0,0 +1,27 @@
+//===-- Definition of macros from sys/wait.h ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LINUX_SYS_WAIT_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_SYS_WAIT_MACROS_H
+
+#include <linux/wait.h>
+
+#define WCOREDUMP(status) ((status) & WCOREFLAG)
+#define WEXITSTATUS(status) (((status) & 0xff00) >> 8)
+#define WIFCONTINUED(status) ((status) == 0xffff)
+#define WIFEXITED(status) (WTERMSIG(status) == 0)
+#define WIFSIGNALED(status) ((WTERMSIG(status) + 1) >= 2)
+#define WIFSTOPPED(status) (WTERMSIG(status) == 0x7f)
+#define WSTOPSIG(status) WEXITSTATUS(status)
+#define WTERMSIG(status) ((status) & 0x7f)
+
+#define WCOREFLAG 0x80
+#define W_EXITCODE(ret, sig) ((ret) << 8 | (sig))
+#define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
+
+#endif // LLVM_LIBC_MACROS_LINUX_SYS_WAIT_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/linux/termios-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/termios-macros.h
new file mode 100644
index 000000000000..668cfe27abaa
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/termios-macros.h
@@ -0,0 +1,167 @@
+//===-- Definition of macros from termios.h -------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LINUX_TERMIOS_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_TERMIOS_MACROS_H
+
+// Below are generic definitions of symbolic bit-masks, modes etc. They serve
+// most architectures including x86_64, aarch64 but have to be adjusted for few
+// architectures MIPS.
+
+#define NCCS 32
+
+// Bit-masks for the c_iflag field of struct termios.
+#define IGNBRK 0000001  // Ignore break condition
+#define BRKINT 0000002  // Signal interrupt on break
+#define IGNPAR 0000004  // Ignore characters with parity errors
+#define PARMRK 0000010  // Mark parity and framing errors
+#define INPCK 0000020   // Enable input parity check
+#define ISTRIP 0000040  // Strip 8th bit off characters
+#define INLCR 0000100   // Map NL to CR on input
+#define IGNCR 0000200   // Ignore CR
+#define ICRNL 0000400   // Map CR to NL on input
+#define IUCLC 0001000   // Map uppercase characters to lowercase on input
+#define IXON 0002000    // Enable start/stop output control
+#define IXANY 0004000   // Enable any character to restart output
+#define IXOFF 0010000   // Enable start/stop input control
+#define IMAXBEL 0020000 // Ring bell when input queue is full
+#define IUTF8 0040000   // Input is UTF8 (not in POSIX)
+
+// Bit-masks for the c_oflag field of struct termios.
+#define OPOST 0000001  // Post-process output
+#define OLCUC 0000002  // Map lowercase characters to uppercase on output
+#define ONLCR 0000004  // Map NL to CR-NL on output
+#define OCRNL 0000010  // Map CR to NL on output
+#define ONOCR 0000020  // No CR output at column 0
+#define ONLRET 0000040 // NL performs CR function
+#define OFILL 0000100  // Use fill characters for delay
+#define OFDEL 0000200  // Fill is DEL
+#define NLDLY 0000400  // Select newline delays
+#define NL0 0000000    // Newline type 0
+#define NL1 0000400    // Newline type 1
+#define CRDLY 0003000  // Select carriage-return delays
+#define CR0 0000000    // Carriage-return delay type 0
+#define CR1 0001000    // Carriage-return delay type 1
+#define CR2 0002000    // Carriage-return delay type 2
+#define CR3 0003000    // Carriage-return delay type 3
+#define TABDLY 0014000 // Select horizontal-tab delays
+#define TAB0 0000000   // Horizontal-tab delay type 0
+#define TAB1 0004000   // Horizontal-tab delay type 1
+#define TAB2 0010000   // Horizontal-tab delay type 2
+#define TAB3 0014000   // Expand tabs to spaces
+#define BSDLY 0020000  // Select backspace delays
+#define BS0 0000000    // Backspace-delay type 0
+#define BS1 0020000    // Backspace-delay type 1
+#define FFDLY 0100000  // Select form-feed delays
+#define FF0 0000000    // Form-feed delay type 0
+#define FF1 0100000    // Form-feed delay type 1
+#define VTDLY 0040000  // Select vertical-tab delays
+#define VT0 0000000    // Vertical-tab delay type 0
+#define VT1 0040000    // Vertical-tab delay type 1
+#define XTABS 0014000
+
+// Symbolic subscripts for the c_cc array.
+#define VINTR 0
+#define VQUIT 1
+#define VERASE 2
+#define VKILL 3
+#define VEOF 4
+#define VTIME 5
+#define VMIN 6
+#define VSWTC 7
+#define VSTART 8
+#define VSTOP 9
+#define VSUSP 10
+#define VEOL 11
+#define VREPRINT 12
+#define VDISCARD 13
+#define VWERASE 14
+#define VLNEXT 15
+#define VEOL2 16
+
+// Baud rate related definitions
+#define CBAUD 000000010017  // Baud speed mask
+#define CBAUDX 000000010000 // Extra baud speed mask
+#define CIBAUD 002003600000
+#define CMSPAR 010000000000
+#define CRTSCTS 020000000000
+// Baud rates with values representable by the speed_t type.
+#define B0 0000000 // Implies hang-up
+// A symbol B<NN+> below indicates a baud rate of <NN+>.
+#define B50 0000001
+#define B75 0000002
+#define B110 0000003
+#define B134 0000004
+#define B150 0000005
+#define B200 0000006
+#define B300 0000007
+#define B600 0000010
+#define B1200 0000011
+#define B1800 0000012
+#define B2400 0000013
+#define B4800 0000014
+#define B9600 0000015
+#define B19200 0000016
+#define B38400 0000017
+// Extra baud rates
+#define B57600 0010001
+#define B115200 0010002
+#define B230400 0010003
+#define B460800 0010004
+#define B500000 0010005
+#define B576000 0010006
+#define B921600 0010007
+#define B1000000 0010010
+#define B1152000 0010011
+#define B1500000 0010012
+#define B2000000 0010013
+#define B2500000 0010014
+#define B3000000 0010015
+#define B3500000 0010016
+#define B4000000 0010017
+
+// Control mode bits for use in the c_cflag field of struct termios.
+#define CSIZE 0000060 // Mask for character size bits
+#define CS5 0000000
+#define CS6 0000020
+#define CS7 0000040
+#define CS8 0000060
+#define CSTOPB 0000100 // Send two bits, else one
+#define CREAD 0000200  // Enable receiver
+#define PARENB 0000400 // Parity enable
+#define PARODD 0001000 // Odd parity, else even
+#define HUPCL 0002000  // Hang up on last close
+#define CLOCAL 0004000 // Ignore modem status lines
+
+// Local mode bits for use in the c_lflag field of struct termios.
+#define ISIG 0000001   // Enable signals
+#define ICANON 0000002 // Canonical input (erase and kill processing)
+#define ECHO 0000010   // Enable echo
+#define ECHOE 0000020  // Echo erase character as error-correcting backspace
+#define ECHOK 0000040  // Echo KILL
+#define ECHONL 0000100 // Echo NL
+#define NOFLSH 0000200 // Disable flush after interrupt or quit
+#define TOSTOP 0000400 // Send SIGTTOU for background output
+
+// Attribute selection
+#define TCSANOW 0   // Change attributes immediately
+#define TCSADRAIN 1 // Change attributes when output has drained
+#define TCSAFLUSH 2 // Same as TCSADRAIN and flush pending Output
+
+// Symbolic constants for use with tcflush function.
+#define TCIFLUSH 0  // Flush pending input
+#define TCIOFLUSH 1 // Flush pending input and unstransmitted output
+#define TCOFLUSH 2  // Flush unstransmitted output
+
+// Symbolic constantf for use with tcflow function.
+#define TCOOFF 0 // Transmit a STOP character, intended to suspend input data
+#define TCOON 1  // Transmit a START character, intended to restart input data
+#define TCIOFF 2 // Suspend output
+#define TCION 3  // Restart output
+
+#endif // LLVM_LIBC_MACROS_LINUX_TERMIOS_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/linux/time-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/time-macros.h
new file mode 100644
index 000000000000..407a1eb30eea
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/time-macros.h
@@ -0,0 +1,26 @@
+//===-- Definition of macros from time.h ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LINUX_TIME_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_TIME_MACROS_H
+
+// clock type macros
+#define CLOCK_REALTIME 0
+#define CLOCK_MONOTONIC 1
+#define CLOCK_PROCESS_CPUTIME_ID 2
+#define CLOCK_THREAD_CPUTIME_ID 3
+#define CLOCK_MONOTONIC_RAW 4
+#define CLOCK_REALTIME_COARSE 5
+#define CLOCK_MONOTONIC_COARSE 6
+#define CLOCK_BOOTTIME 7
+#define CLOCK_REALTIME_ALARM 8
+#define CLOCK_BOOTTIME_ALARM 9
+
+#define CLOCKS_PER_SEC 1000000
+
+#endif // LLVM_LIBC_MACROS_LINUX_TIME_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/linux/unistd-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/unistd-macros.h
new file mode 100644
index 000000000000..a4c8e3cd91f7
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/linux/unistd-macros.h
@@ -0,0 +1,57 @@
+//===-- Definition of macros from unistd.h --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LINUX_UNISTD_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_UNISTD_MACROS_H
+
+// Values for mode argument to the access(...) function.
+#define F_OK 0
+#define X_OK 1
+#define W_OK 2
+#define R_OK 4
+
+#define _SC_PAGESIZE 1
+#define _SC_PAGE_SIZE _SC_PAGESIZE
+
+#define _PC_FILESIZEBITS 0
+#define _PC_LINK_MAX 1
+#define _PC_MAX_CANON 2
+#define _PC_MAX_INPUT 3
+#define _PC_NAME_MAX 4
+#define _PC_PATH_MAX 5
+#define _PC_PIPE_BUF 6
+#define _PC_2_SYMLINKS 7
+#define _PC_ALLOC_SIZE_MIN 8
+#define _PC_REC_INCR_XFER_SIZE 9
+#define _PC_REC_MAX_XFER_SIZE 10
+#define _PC_REC_MIN_XFER_SIZE 11
+#define _PC_REC_XFER_ALIGN 12
+#define _PC_SYMLINK_MAX 13
+#define _PC_CHOWN_RESTRICTED 14
+#define _PC_NO_TRUNC 15
+#define _PC_VDISABLE 16
+#define _PC_ASYNC_IO 17
+#define _PC_PRIO_IO 18
+#define _PC_SYNC_IO 19
+
+// TODO: Move these limit macros to a separate file
+#define _POSIX_CHOWN_RESTRICTED 1
+#define _POSIX_PIPE_BUF 512
+#define _POSIX_NO_TRUNC 1
+#define _POSIX_VDISABLE '\0'
+
+// Macro to set up the call to the __llvm_libc_syscall function
+// This is to prevent the call from having fewer than 6 arguments, since six
+// arguments are always passed to the syscall. Unnecessary arguments are
+// ignored.
+#define __syscall_helper(sysno, arg1, arg2, arg3, arg4, arg5, arg6, ...)       \
+  __llvm_libc_syscall((long)(sysno), (long)(arg1), (long)(arg2), (long)(arg3), \
+                      (long)(arg4), (long)(arg5), (long)(arg6))
+#define syscall(...) __syscall_helper(__VA_ARGS__, 0, 1, 2, 3, 4, 5, 6)
+
+#endif // LLVM_LIBC_MACROS_LINUX_UNISTD_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/locale-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/locale-macros.h
new file mode 100644
index 000000000000..892f8b69f3a7
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/locale-macros.h
@@ -0,0 +1,32 @@
+//===-- Definition of macros from locale.h --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LOCALE_MACROS_H
+#define LLVM_LIBC_MACROS_LOCALE_MACROS_H
+
+#include "../llvm-libc-types/locale_t.h"
+
+#define LC_CTYPE 0
+#define LC_NUMERIC 1
+#define LC_TIME 2
+#define LC_COLLATE 3
+#define LC_MONETARY 4
+#define LC_MESSAGES 5
+#define LC_ALL 6
+
+#define LC_GLOBAL_LOCALE ((locale_t)(-1))
+
+#define LC_CTYPE_MASK (1 << LC_CTYPE)
+#define LC_NUMERIC_MASK (1 << LC_NUMERIC)
+#define LC_TIME_MASK (1 << LC_TIME)
+#define LC_COLLATE_MASK (1 << LC_COLLATE)
+#define LC_MONETARY_MASK (1 << LC_MONETARY)
+#define LC_MESSAGES_MASK (1 << LC_MESSAGES)
+#define LC_ALL_MASK 0x7fffffff
+
+#endif // LLVM_LIBC_MACROS_LOCALE_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/malloc-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/malloc-macros.h
new file mode 100644
index 000000000000..65eddfc5e86d
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/malloc-macros.h
@@ -0,0 +1,17 @@
+//===-- Definition of macros to be used with malloc functions -------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_MALLOC_MACROS_H
+#define LLVM_LIBC_MACROS_MALLOC_MACROS_H
+
+// Note: these values only make sense when Scudo is used as the memory
+// allocator.
+#define M_PURGE (-101)
+#define M_PURGE_ALL (-104)
+
+#endif // LLVM_LIBC_MACROS_MALLOC_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/math-function-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/math-function-macros.h
new file mode 100644
index 000000000000..21d09f1f5e1a
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/math-function-macros.h
@@ -0,0 +1,37 @@
+//===-- Definition of function macros from math.h -------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_MATH_FUNCTION_MACROS_H
+#define LLVM_LIBC_MACROS_MATH_FUNCTION_MACROS_H
+
+#include "math-macros.h"
+
+#ifndef __cplusplus
+#define issignaling(x)                                                         \
+  _Generic((x),                                                                \
+      float: issignalingf,                                                     \
+      double: issignaling,                                                     \
+      long double: issignalingl)(x)
+#define iscanonical(x)                                                         \
+  _Generic((x),                                                                \
+      float: iscanonicalf,                                                     \
+      double: iscanonical,                                                     \
+      long double: iscanonicall)(x)
+#endif
+
+#define isfinite(x) __builtin_isfinite(x)
+#define isinf(x) __builtin_isinf(x)
+#define isnan(x) __builtin_isnan(x)
+#define signbit(x) __builtin_signbit(x)
+#define iszero(x) (x == 0)
+#define fpclassify(x)                                                          \
+  __builtin_fpclassify(FP_NAN, FP_INFINITE, FP_NORMAL, FP_SUBNORMAL, FP_ZERO, x)
+#define isnormal(x) __builtin_isnormal(x)
+#define issubnormal(x) (fpclassify(x) == FP_SUBNORMAL)
+
+#endif // LLVM_LIBC_MACROS_MATH_FUNCTION_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/math-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/math-macros.h
new file mode 100644
index 000000000000..2f05d7544666
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/math-macros.h
@@ -0,0 +1,53 @@
+//===-- Definition of macros from math.h ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_MATH_MACROS_H
+#define LLVM_LIBC_MACROS_MATH_MACROS_H
+
+#include "limits-macros.h"
+
+#define FP_NAN 0
+#define FP_INFINITE 1
+#define FP_ZERO 2
+#define FP_SUBNORMAL 3
+#define FP_NORMAL 4
+
+#define FP_INT_UPWARD 0
+#define FP_INT_DOWNWARD 1
+#define FP_INT_TOWARDZERO 2
+#define FP_INT_TONEARESTFROMZERO 3
+#define FP_INT_TONEAREST 4
+
+#define MATH_ERRNO 1
+#define MATH_ERREXCEPT 2
+
+#define HUGE_VAL __builtin_huge_val()
+#define HUGE_VALF __builtin_huge_valf()
+#define INFINITY __builtin_inff()
+#define NAN __builtin_nanf("")
+
+#define FP_ILOGB0 (-INT_MAX - 1)
+#define FP_LLOGB0 (-LONG_MAX - 1)
+
+#ifdef __FP_LOGBNAN_MIN
+#define FP_ILOGBNAN (-INT_MAX - 1)
+#define FP_LLOGBNAN (-LONG_MAX - 1)
+#else
+#define FP_ILOGBNAN INT_MAX
+#define FP_LLOGBNAN LONG_MAX
+#endif
+
+#if defined(__NVPTX__) || defined(__AMDGPU__) || defined(__FAST_MATH__)
+#define math_errhandling 0
+#elif defined(__NO_MATH_ERRNO__)
+#define math_errhandling (MATH_ERREXCEPT)
+#else
+#define math_errhandling (MATH_ERRNO | MATH_ERREXCEPT)
+#endif
+
+#endif // LLVM_LIBC_MACROS_MATH_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/null-macro.h b/contrib/llvm-project/libc/include/llvm-libc-macros/null-macro.h
new file mode 100644
index 000000000000..416d4e865fc5
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/null-macro.h
@@ -0,0 +1,15 @@
+//===-- Definition of the NULL macro --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_NULL_MACRO_H
+#define LLVM_LIBC_MACROS_NULL_MACRO_H
+
+#define __need_NULL
+#include <stddef.h>
+
+#endif // LLVM_LIBC_MACROS_NULL_MACRO_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/offsetof-macro.h b/contrib/llvm-project/libc/include/llvm-libc-macros/offsetof-macro.h
new file mode 100644
index 000000000000..208c06b29cb6
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/offsetof-macro.h
@@ -0,0 +1,15 @@
+//===-- Definition of the offsetof macro ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_OFFSETOF_MACRO_H
+#define LLVM_LIBC_MACROS_OFFSETOF_MACRO_H
+
+#define __need_offsetof
+#include <stddef.h>
+
+#endif // LLVM_LIBC_MACROS_OFFSETOF_MACRO_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/poll-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/poll-macros.h
new file mode 100644
index 000000000000..52b59a978a21
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/poll-macros.h
@@ -0,0 +1,16 @@
+//===-- Macros defined in poll.h header file ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_POLL_MACROS_H
+#define LLVM_LIBC_MACROS_POLL_MACROS_H
+
+#ifdef __linux__
+#include "linux/poll-macros.h"
+#endif
+
+#endif // LLVM_LIBC_MACROS_POLL_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/pthread-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/pthread-macros.h
new file mode 100644
index 000000000000..fcc6ef925e3f
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/pthread-macros.h
@@ -0,0 +1,65 @@
+//===-- Definition of pthread macros --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_PTHREAD_MACRO_H
+#define LLVM_LIBC_MACROS_PTHREAD_MACRO_H
+
+#include "null-macro.h"
+
+#define PTHREAD_CREATE_JOINABLE 0
+#define PTHREAD_CREATE_DETACHED 1
+
+#define PTHREAD_MUTEX_NORMAL 0
+#define PTHREAD_MUTEX_ERRORCHECK 1
+#define PTHREAD_MUTEX_RECURSIVE 2
+#define PTHREAD_MUTEX_DEFAULT PTHREAD_MUTEX_NORMAL
+
+#define PTHREAD_MUTEX_STALLED 0
+#define PTHREAD_MUTEX_ROBUST 1
+
+#define PTHREAD_ONCE_INIT {0}
+
+#define PTHREAD_PROCESS_PRIVATE 0
+#define PTHREAD_PROCESS_SHARED 1
+
+#ifdef __linux__
+#define PTHREAD_MUTEX_INITIALIZER                                              \
+  {                                                                            \
+      /* .__timed = */ 0,      /* .__recursive = */ 0,                         \
+      /* .__robust = */ 0,     /* .__owner = */ NULL,                          \
+      /* .__lock_count = */ 0, /* .__futex_word = */ {0},                      \
+  }
+#else
+#define PTHREAD_MUTEX_INITIALIZER                                              \
+  {                                                                            \
+      /* .__timed = */ 0,      /* .__recursive = */ 0,                         \
+      /* .__robust = */ 0,     /* .__owner = */ NULL,                          \
+      /* .__lock_count = */ 0,                                                 \
+  }
+#endif
+
+#define PTHREAD_RWLOCK_INITIALIZER                                             \
+  {                                                                            \
+      /* .__is_pshared = */ 0,                                                 \
+      /* .__preference = */ 0,                                                 \
+      /* .__state = */ 0,                                                      \
+      /* .__write_tid = */ 0,                                                  \
+      /* .__wait_queue_mutex = */ {0},                                         \
+      /* .__pending_readers = */ {0},                                          \
+      /* .__pending_writers = */ {0},                                          \
+      /* .__reader_serialization = */ {0},                                     \
+      /* .__writer_serialization = */ {0},                                     \
+  }
+
+// glibc extensions
+#define PTHREAD_STACK_MIN (1 << 14) // 16KB
+#define PTHREAD_RWLOCK_PREFER_READER_NP 0
+#define PTHREAD_RWLOCK_PREFER_WRITER_NP 1
+#define PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP 2
+
+#endif // LLVM_LIBC_MACROS_PTHREAD_MACRO_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/sched-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/sched-macros.h
new file mode 100644
index 000000000000..0f643029816c
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/sched-macros.h
@@ -0,0 +1,16 @@
+//===-- Macros defined in sched.h header file -----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_SCHED_MACROS_H
+#define LLVM_LIBC_MACROS_SCHED_MACROS_H
+
+#ifdef __linux__
+#include "linux/sched-macros.h"
+#endif
+
+#endif // LLVM_LIBC_MACROS_SCHED_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/signal-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/signal-macros.h
new file mode 100644
index 000000000000..fbe929a0fea2
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/signal-macros.h
@@ -0,0 +1,18 @@
+//===-- Definition of signal number macros --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_SIGNAL_MACROS_H
+#define LLVM_LIBC_MACROS_SIGNAL_MACROS_H
+
+#if defined(__linux__)
+#include "linux/signal-macros.h"
+#elif defined(__NVPTX__) || defined(__AMDGPU__)
+#include "gpu/signal-macros.h"
+#endif
+
+#endif // LLVM_LIBC_MACROS_SIGNAL_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/stdbit-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/stdbit-macros.h
new file mode 100644
index 000000000000..c5b2f0977834
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/stdbit-macros.h
@@ -0,0 +1,316 @@
+//===-- Definition of macros to be used with stdbit functions ----------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_LIBC_MACROS_STDBIT_MACROS_H
+#define __LLVM_LIBC_MACROS_STDBIT_MACROS_H
+
+#define __STDC_VERSION_STDBIT_H__ 202311L
+#define __STDC_ENDIAN_LITTLE__ __ORDER_LITTLE_ENDIAN__
+#define __STDC_ENDIAN_BIG__ __ORDER_BIG_ENDIAN__
+#define __STDC_ENDIAN_NATIVE__ __BYTE_ORDER__
+
+// TODO(https://github.com/llvm/llvm-project/issues/80509): support _BitInt().
+#ifdef __cplusplus
+inline unsigned stdc_leading_zeros(unsigned char x) {
+  return stdc_leading_zeros_uc(x);
+}
+inline unsigned stdc_leading_zeros(unsigned short x) {
+  return stdc_leading_zeros_us(x);
+}
+inline unsigned stdc_leading_zeros(unsigned x) {
+  return stdc_leading_zeros_ui(x);
+}
+inline unsigned stdc_leading_zeros(unsigned long x) {
+  return stdc_leading_zeros_ul(x);
+}
+inline unsigned stdc_leading_zeros(unsigned long long x) {
+  return stdc_leading_zeros_ull(x);
+}
+inline unsigned stdc_leading_ones(unsigned char x) {
+  return stdc_leading_ones_uc(x);
+}
+inline unsigned stdc_leading_ones(unsigned short x) {
+  return stdc_leading_ones_us(x);
+}
+inline unsigned stdc_leading_ones(unsigned x) {
+  return stdc_leading_ones_ui(x);
+}
+inline unsigned stdc_leading_ones(unsigned long x) {
+  return stdc_leading_ones_ul(x);
+}
+inline unsigned stdc_leading_ones(unsigned long long x) {
+  return stdc_leading_ones_ull(x);
+}
+inline unsigned stdc_trailing_zeros(unsigned char x) {
+  return stdc_trailing_zeros_uc(x);
+}
+inline unsigned stdc_trailing_zeros(unsigned short x) {
+  return stdc_trailing_zeros_us(x);
+}
+inline unsigned stdc_trailing_zeros(unsigned x) {
+  return stdc_trailing_zeros_ui(x);
+}
+inline unsigned stdc_trailing_zeros(unsigned long x) {
+  return stdc_trailing_zeros_ul(x);
+}
+inline unsigned stdc_trailing_zeros(unsigned long long x) {
+  return stdc_trailing_zeros_ull(x);
+}
+inline unsigned stdc_trailing_ones(unsigned char x) {
+  return stdc_trailing_ones_uc(x);
+}
+inline unsigned stdc_trailing_ones(unsigned short x) {
+  return stdc_trailing_ones_us(x);
+}
+inline unsigned stdc_trailing_ones(unsigned x) {
+  return stdc_trailing_ones_ui(x);
+}
+inline unsigned stdc_trailing_ones(unsigned long x) {
+  return stdc_trailing_ones_ul(x);
+}
+inline unsigned stdc_trailing_ones(unsigned long long x) {
+  return stdc_trailing_ones_ull(x);
+}
+inline unsigned stdc_first_leading_zero(unsigned char x) {
+  return stdc_first_leading_zero_uc(x);
+}
+inline unsigned stdc_first_leading_zero(unsigned short x) {
+  return stdc_first_leading_zero_us(x);
+}
+inline unsigned stdc_first_leading_zero(unsigned x) {
+  return stdc_first_leading_zero_ui(x);
+}
+inline unsigned stdc_first_leading_zero(unsigned long x) {
+  return stdc_first_leading_zero_ul(x);
+}
+inline unsigned stdc_first_leading_zero(unsigned long long x) {
+  return stdc_first_leading_zero_ull(x);
+}
+inline unsigned stdc_first_leading_one(unsigned char x) {
+  return stdc_first_leading_one_uc(x);
+}
+inline unsigned stdc_first_leading_one(unsigned short x) {
+  return stdc_first_leading_one_us(x);
+}
+inline unsigned stdc_first_leading_one(unsigned x) {
+  return stdc_first_leading_one_ui(x);
+}
+inline unsigned stdc_first_leading_one(unsigned long x) {
+  return stdc_first_leading_one_ul(x);
+}
+inline unsigned stdc_first_leading_one(unsigned long long x) {
+  return stdc_first_leading_one_ull(x);
+}
+inline unsigned stdc_first_trailing_zero(unsigned char x) {
+  return stdc_first_trailing_zero_uc(x);
+}
+inline unsigned stdc_first_trailing_zero(unsigned short x) {
+  return stdc_first_trailing_zero_us(x);
+}
+inline unsigned stdc_first_trailing_zero(unsigned x) {
+  return stdc_first_trailing_zero_ui(x);
+}
+inline unsigned stdc_first_trailing_zero(unsigned long x) {
+  return stdc_first_trailing_zero_ul(x);
+}
+inline unsigned stdc_first_trailing_zero(unsigned long long x) {
+  return stdc_first_trailing_zero_ull(x);
+}
+inline unsigned stdc_first_trailing_one(unsigned char x) {
+  return stdc_first_trailing_one_uc(x);
+}
+inline unsigned stdc_first_trailing_one(unsigned short x) {
+  return stdc_first_trailing_one_us(x);
+}
+inline unsigned stdc_first_trailing_one(unsigned x) {
+  return stdc_first_trailing_one_ui(x);
+}
+inline unsigned stdc_first_trailing_one(unsigned long x) {
+  return stdc_first_trailing_one_ul(x);
+}
+inline unsigned stdc_first_trailing_one(unsigned long long x) {
+  return stdc_first_trailing_one_ull(x);
+}
+inline unsigned stdc_count_zeros(unsigned char x) {
+  return stdc_count_zeros_uc(x);
+}
+inline unsigned stdc_count_zeros(unsigned short x) {
+  return stdc_count_zeros_us(x);
+}
+inline unsigned stdc_count_zeros(unsigned x) { return stdc_count_zeros_ui(x); }
+inline unsigned stdc_count_zeros(unsigned long x) {
+  return stdc_count_zeros_ul(x);
+}
+inline unsigned stdc_count_zeros(unsigned long long x) {
+  return stdc_count_zeros_ull(x);
+}
+inline unsigned stdc_count_ones(unsigned char x) {
+  return stdc_count_ones_uc(x);
+}
+inline unsigned stdc_count_ones(unsigned short x) {
+  return stdc_count_ones_us(x);
+}
+inline unsigned stdc_count_ones(unsigned x) { return stdc_count_ones_ui(x); }
+inline unsigned stdc_count_ones(unsigned long x) {
+  return stdc_count_ones_ul(x);
+}
+inline unsigned stdc_count_ones(unsigned long long x) {
+  return stdc_count_ones_ull(x);
+}
+inline bool stdc_has_single_bit(unsigned char x) {
+  return stdc_has_single_bit_uc(x);
+}
+inline bool stdc_has_single_bit(unsigned short x) {
+  return stdc_has_single_bit_us(x);
+}
+inline bool stdc_has_single_bit(unsigned x) {
+  return stdc_has_single_bit_ui(x);
+}
+inline bool stdc_has_single_bit(unsigned long x) {
+  return stdc_has_single_bit_ul(x);
+}
+inline bool stdc_has_single_bit(unsigned long long x) {
+  return stdc_has_single_bit_ull(x);
+}
+inline unsigned stdc_bit_width(unsigned char x) { return stdc_bit_width_uc(x); }
+inline unsigned stdc_bit_width(unsigned short x) {
+  return stdc_bit_width_us(x);
+}
+inline unsigned stdc_bit_width(unsigned x) { return stdc_bit_width_ui(x); }
+inline unsigned stdc_bit_width(unsigned long x) { return stdc_bit_width_ul(x); }
+inline unsigned stdc_bit_width(unsigned long long x) {
+  return stdc_bit_width_ull(x);
+}
+inline unsigned char stdc_bit_floor(unsigned char x) {
+  return stdc_bit_floor_uc(x);
+}
+inline unsigned short stdc_bit_floor(unsigned short x) {
+  return stdc_bit_floor_us(x);
+}
+inline unsigned stdc_bit_floor(unsigned x) { return stdc_bit_floor_ui(x); }
+inline unsigned long stdc_bit_floor(unsigned long x) {
+  return stdc_bit_floor_ul(x);
+}
+inline unsigned long long stdc_bit_floor(unsigned long long x) {
+  return stdc_bit_floor_ull(x);
+}
+inline unsigned char stdc_bit_ceil(unsigned char x) {
+  return stdc_bit_ceil_uc(x);
+}
+inline unsigned short stdc_bit_ceil(unsigned short x) {
+  return stdc_bit_ceil_us(x);
+}
+inline unsigned stdc_bit_ceil(unsigned x) { return stdc_bit_ceil_ui(x); }
+inline unsigned long stdc_bit_ceil(unsigned long x) {
+  return stdc_bit_ceil_ul(x);
+}
+inline unsigned long long stdc_bit_ceil(unsigned long long x) {
+  return stdc_bit_ceil_ull(x);
+}
+#else
+#define stdc_leading_zeros(x)                                                  \
+  _Generic((x),                                                                \
+      unsigned char: stdc_leading_zeros_uc,                                    \
+      unsigned short: stdc_leading_zeros_us,                                   \
+      unsigned: stdc_leading_zeros_ui,                                         \
+      unsigned long: stdc_leading_zeros_ul,                                    \
+      unsigned long long: stdc_leading_zeros_ull)(x)
+#define stdc_leading_ones(x)                                                   \
+  _Generic((x),                                                                \
+      unsigned char: stdc_leading_ones_uc,                                     \
+      unsigned short: stdc_leading_ones_us,                                    \
+      unsigned: stdc_leading_ones_ui,                                          \
+      unsigned long: stdc_leading_ones_ul,                                     \
+      unsigned long long: stdc_leading_ones_ull)(x)
+#define stdc_trailing_zeros(x)                                                 \
+  _Generic((x),                                                                \
+      unsigned char: stdc_trailing_zeros_uc,                                   \
+      unsigned short: stdc_trailing_zeros_us,                                  \
+      unsigned: stdc_trailing_zeros_ui,                                        \
+      unsigned long: stdc_trailing_zeros_ul,                                   \
+      unsigned long long: stdc_trailing_zeros_ull)(x)
+#define stdc_trailing_ones(x)                                                  \
+  _Generic((x),                                                                \
+      unsigned char: stdc_trailing_ones_uc,                                    \
+      unsigned short: stdc_trailing_ones_us,                                   \
+      unsigned: stdc_trailing_ones_ui,                                         \
+      unsigned long: stdc_trailing_ones_ul,                                    \
+      unsigned long long: stdc_trailing_ones_ull)(x)
+#define stdc_first_leading_zero(x)                                             \
+  _Generic((x),                                                                \
+      unsigned char: stdc_first_leading_zero_uc,                               \
+      unsigned short: stdc_first_leading_zero_us,                              \
+      unsigned: stdc_first_leading_zero_ui,                                    \
+      unsigned long: stdc_first_leading_zero_ul,                               \
+      unsigned long long: stdc_first_leading_zero_ull)(x)
+#define stdc_first_leading_one(x)                                              \
+  _Generic((x),                                                                \
+      unsigned char: stdc_first_leading_one_uc,                                \
+      unsigned short: stdc_first_leading_one_us,                               \
+      unsigned: stdc_first_leading_one_ui,                                     \
+      unsigned long: stdc_first_leading_one_ul,                                \
+      unsigned long long: stdc_first_leading_one_ull)(x)
+#define stdc_first_trailing_zero(x)                                            \
+  _Generic((x),                                                                \
+      unsigned char: stdc_first_trailing_zero_uc,                              \
+      unsigned short: stdc_first_trailing_zero_us,                             \
+      unsigned: stdc_first_trailing_zero_ui,                                   \
+      unsigned long: stdc_first_trailing_zero_ul,                              \
+      unsigned long long: stdc_first_trailing_zero_ull)(x)
+#define stdc_first_trailing_one(x)                                             \
+  _Generic((x),                                                                \
+      unsigned char: stdc_first_trailing_one_uc,                               \
+      unsigned short: stdc_first_trailing_one_us,                              \
+      unsigned: stdc_first_trailing_one_ui,                                    \
+      unsigned long: stdc_first_trailing_one_ul,                               \
+      unsigned long long: stdc_first_trailing_one_ull)(x)
+#define stdc_count_zeros(x)                                                    \
+  _Generic((x),                                                                \
+      unsigned char: stdc_count_zeros_uc,                                      \
+      unsigned short: stdc_count_zeros_us,                                     \
+      unsigned: stdc_count_zeros_ui,                                           \
+      unsigned long: stdc_count_zeros_ul,                                      \
+      unsigned long long: stdc_count_zeros_ull)(x)
+#define stdc_count_ones(x)                                                     \
+  _Generic((x),                                                                \
+      unsigned char: stdc_count_ones_uc,                                       \
+      unsigned short: stdc_count_ones_us,                                      \
+      unsigned: stdc_count_ones_ui,                                            \
+      unsigned long: stdc_count_ones_ul,                                       \
+      unsigned long long: stdc_count_ones_ull)(x)
+#define stdc_has_single_bit(x)                                                 \
+  _Generic((x),                                                                \
+      unsigned char: stdc_has_single_bit_uc,                                   \
+      unsigned short: stdc_has_single_bit_us,                                  \
+      unsigned: stdc_has_single_bit_ui,                                        \
+      unsigned long: stdc_has_single_bit_ul,                                   \
+      unsigned long long: stdc_has_single_bit_ull)(x)
+#define stdc_bit_width(x)                                                      \
+  _Generic((x),                                                                \
+      unsigned char: stdc_bit_width_uc,                                        \
+      unsigned short: stdc_bit_width_us,                                       \
+      unsigned: stdc_bit_width_ui,                                             \
+      unsigned long: stdc_bit_width_ul,                                        \
+      unsigned long long: stdc_bit_width_ull)(x)
+#define stdc_bit_floor(x)                                                      \
+  _Generic((x),                                                                \
+      unsigned char: stdc_bit_floor_uc,                                        \
+      unsigned short: stdc_bit_floor_us,                                       \
+      unsigned: stdc_bit_floor_ui,                                             \
+      unsigned long: stdc_bit_floor_ul,                                        \
+      unsigned long long: stdc_bit_floor_ull)(x)
+#define stdc_bit_ceil(x)                                                       \
+  _Generic((x),                                                                \
+      unsigned char: stdc_bit_ceil_uc,                                         \
+      unsigned short: stdc_bit_ceil_us,                                        \
+      unsigned: stdc_bit_ceil_ui,                                              \
+      unsigned long: stdc_bit_ceil_ul,                                         \
+      unsigned long long: stdc_bit_ceil_ull)(x)
+#endif // __cplusplus
+
+#endif // __LLVM_LIBC_MACROS_STDBIT_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/stdckdint-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/stdckdint-macros.h
new file mode 100644
index 000000000000..17e4ccdc2d5f
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/stdckdint-macros.h
@@ -0,0 +1,27 @@
+//===-- Definition of macros for stdckdint.h ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_STDCKDINT_MACROS_H
+#define LLVM_LIBC_MACROS_STDCKDINT_MACROS_H
+
+// We need to use __builtin_*_overflow from GCC/Clang to implement the overflow
+// macros. Check __GNUC__ or __clang__ for availability of such builtins.
+// Note that clang-cl defines __clang__ only and does not define __GNUC__ so we
+// have to check for both.
+#if defined(__GNUC__) || defined(__clang__)
+// clang/gcc overlay may provides similar macros, we need to avoid redefining
+// them.
+#ifndef __STDC_VERSION_STDCKDINT_H__
+#define __STDC_VERSION_STDCKDINT_H__ 202311L
+
+#define ckd_add(R, A, B) __builtin_add_overflow((A), (B), (R))
+#define ckd_sub(R, A, B) __builtin_sub_overflow((A), (B), (R))
+#define ckd_mul(R, A, B) __builtin_mul_overflow((A), (B), (R))
+#endif // __STDC_VERSION_STDCKDINT_H__
+#endif // __GNUC__
+#endif // LLVM_LIBC_MACROS_STDCKDINT_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/stdfix-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/stdfix-macros.h
new file mode 100644
index 000000000000..04097e14e974
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/stdfix-macros.h
@@ -0,0 +1,367 @@
+//===-- Definitions from stdfix.h -----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_STDFIX_MACROS_H
+#define LLVM_LIBC_MACROS_STDFIX_MACROS_H
+
+#ifdef __FRACT_FBIT__
+// _Fract and _Accum types are available
+#define LIBC_COMPILER_HAS_FIXED_POINT
+#endif // __FRACT_FBIT__
+
+#ifdef LIBC_COMPILER_HAS_FIXED_POINT
+
+#define fract _Fract
+#define accum _Accum
+#define sat _Sat
+
+// Default values: from ISO/IEC TR 18037:2008 standard - Annex A.3 - Typical
+// desktop processor.
+
+#ifdef __SFRACT_FBIT__
+#define SFRACT_FBIT __SFRACT_FBIT__
+#else
+#define SFRACT_FBIT 7
+#endif // SFRACT_FBIT
+
+#ifdef __SFRACT_MIN__
+#define SFRACT_MIN __SFRACT_MIN__
+#else
+#define SFRACT_MIN (-0.5HR - 0.5HR)
+#endif // SFRACT_MIN
+
+#ifdef __SFRACT_MAX__
+#define SFRACT_MAX __SFRACT_MAX__
+#else
+#define SFRACT_MAX 0x1.FCp-1HR
+#endif // SFRACT_MAX
+
+#ifdef __SFRACT_EPSILON__
+#define SFRACT_EPSILON __SFRACT_EPSILON__
+#else
+#define SFRACT_EPSILON 0x1.0p-7HR
+#endif // SFRACT_EPSILON
+
+#ifdef __USFRACT_FBIT__
+#define USFRACT_FBIT __USFRACT_FBIT__
+#else
+#define USFRACT_FBIT 8
+#endif // USFRACT_FBIT
+
+#define USFRACT_MIN 0.0UHR
+
+#ifdef __USFRACT_MAX__
+#define USFRACT_MAX __USFRACT_MAX__
+#else
+#define USFRACT_MAX 0x1.FEp-1UHR
+#endif // USFRACT_MAX
+
+#ifdef __USFRACT_EPSILON__
+#define USFRACT_EPSILON __USFRACT_EPSILON__
+#else
+#define USFRACT_EPSILON 0x1.0p-8UHR
+#endif // USFRACT_EPSILON
+
+#ifdef __FRACT_FBIT__
+#define FRACT_FBIT __FRACT_FBIT__
+#else
+#define FRACT_FBIT 15
+#endif // FRACT_FBIT
+
+#ifdef __FRACT_MIN__
+#define FRACT_MIN __FRACT_MIN__
+#else
+#define FRACT_MIN (-0.5R - 0.5R)
+#endif // FRACT_MIN
+
+#ifdef __FRACT_MAX__
+#define FRACT_MAX __FRACT_MAX__
+#else
+#define FRACT_MAX 0x1.FFFCp-1R
+#endif // FRACT_MAX
+
+#ifdef __FRACT_EPSILON__
+#define FRACT_EPSILON __FRACT_EPSILON__
+#else
+#define FRACT_EPSILON 0x1.0p-15R
+#endif // FRACT_EPSILON
+
+#ifdef __UFRACT_FBIT__
+#define UFRACT_FBIT __UFRACT_FBIT__
+#else
+#define UFRACT_FBIT 16
+#endif // UFRACT_FBIT
+
+#define UFRACT_MIN 0.0UR
+
+#ifdef __UFRACT_MAX__
+#define UFRACT_MAX __UFRACT_MAX__
+#else
+#define UFRACT_MAX 0x1.FFFEp-1UR
+#endif // UFRACT_MAX
+
+#ifdef __UFRACT_EPSILON__
+#define UFRACT_EPSILON __UFRACT_EPSILON__
+#else
+#define UFRACT_EPSILON 0x1.0p-16UR
+#endif // UFRACT_EPSILON
+
+#ifdef __LFRACT_FBIT__
+#define LFRACT_FBIT __LFRACT_FBIT__
+#else
+#define LFRACT_FBIT 31
+#endif // LFRACT_FBIT
+
+#ifdef __LFRACT_MIN__
+#define LFRACT_MIN __LFRACT_MIN__
+#else
+#define LFRACT_MIN (-0.5LR - 0.5LR)
+#endif // LFRACT_MIN
+
+#ifdef __LFRACT_MAX__
+#define LFRACT_MAX __LFRACT_MAX__
+#else
+#define LFRACT_MAX 0x1.FFFFFFFCp-1LR
+#endif // LFRACT_MAX
+
+#ifdef __LFRACT_EPSILON__
+#define LFRACT_EPSILON __LFRACT_EPSILON__
+#else
+#define LFRACT_EPSILON 0x1.0p-31LR
+#endif // LFRACT_EPSILON
+
+#ifdef __ULFRACT_FBIT__
+#define ULFRACT_FBIT __ULFRACT_FBIT__
+#else
+#define ULFRACT_FBIT 32
+#endif // ULFRACT_FBIT
+
+#define ULFRACT_MIN 0.0ULR
+
+#ifdef __ULFRACT_MAX__
+#define ULFRACT_MAX __ULFRACT_MAX__
+#else
+#define ULFRACT_MAX 0x1.FFFFFFFEp-1ULR
+#endif // ULFRACT_MAX
+
+#ifdef __ULFRACT_EPSILON__
+#define ULFRACT_EPSILON __ULFRACT_EPSILON__
+#else
+#define ULFRACT_EPSILON 0x1.0p-32ULR
+#endif // ULFRACT_EPSILON
+
+#ifdef __SACCUM_FBIT__
+#define SACCUM_FBIT __SACCUM_FBIT__
+#else
+#define SACCUM_FBIT 7
+#endif // SACCUM_FBIT
+
+#ifdef __SACCUM_IBIT__
+#define SACCUM_IBIT __SACCUM_IBIT__
+#else
+#define SACCUM_IBIT 8
+#endif // SACCUM_IBIT
+
+#ifdef __SACCUM_MIN__
+#define SACCUM_MIN __SACCUM_MIN__
+#else
+#define SACCUM_MIN (-0x1.0p+7HK - 0x1.0p+7HK)
+#endif // SACCUM_MIN
+
+#ifdef __SACCUM_MAX__
+#define SACCUM_MAX __SACCUM_MAX__
+#else
+#define SACCUM_MAX 0x1.FFFCp+7HK
+#endif // SACCUM_MAX
+
+#ifdef __SACCUM_EPSILON__
+#define SACCUM_EPSILON __SACCUM_EPSILON__
+#else
+#define SACCUM_EPSILON 0x1.0p-7HK
+#endif // SACCUM_EPSILON
+
+#ifdef __USACCUM_FBIT__
+#define USACCUM_FBIT __USACCUM_FBIT__
+#else
+#define USACCUM_FBIT 8
+#endif // USACCUM_FBIT
+
+#ifdef __USACCUM_IBIT__
+#define USACCUM_IBIT __USACCUM_IBIT__
+#else
+#define USACCUM_IBIT 8
+#endif // USACCUM_IBIT
+
+#define USACCUM_MIN 0.0UHK
+
+#ifdef __USACCUM_MAX__
+#define USACCUM_MAX __USACCUM_MAX__
+#else
+#define USACCUM_MAX 0x1.FFFEp+7UHK
+#endif // USACCUM_MAX
+
+#ifdef __USACCUM_EPSILON__
+#define USACCUM_EPSILON __USACCUM_EPSILON__
+#else
+#define USACCUM_EPSILON 0x1.0p-8UHK
+#endif // USACCUM_EPSILON
+
+#ifdef __ACCUM_FBIT__
+#define ACCUM_FBIT __ACCUM_FBIT__
+#else
+#define ACCUM_FBIT 15
+#endif // ACCUM_FBIT
+
+#ifdef __ACCUM_IBIT__
+#define ACCUM_IBIT __ACCUM_IBIT__
+#else
+#define ACCUM_IBIT 16
+#endif // ACCUM_IBIT
+
+#ifdef __ACCUM_MIN__
+#define ACCUM_MIN __ACCUM_MIN__
+#else
+#define ACCUM_MIN (-0x1.0p+15K - 0x1.0p+15K)
+#endif // ACCUM_MIN
+
+#ifdef __ACCUM_MAX__
+#define ACCUM_MAX __ACCUM_MAX__
+#else
+#define ACCUM_MAX 0x1.FFFFFFFCp+15K
+#endif // ACCUM_MAX
+
+#ifdef __ACCUM_EPSILON__
+#define ACCUM_EPSILON __ACCUM_EPSILON__
+#else
+#define ACCUM_EPSILON 0x1.0p-15K
+#endif // ACCUM_EPSILON
+
+#ifdef __UACCUM_FBIT__
+#define UACCUM_FBIT __UACCUM_FBIT__
+#else
+#define UACCUM_FBIT 16
+#endif // UACCUM_FBIT
+
+#ifdef __UACCUM_IBIT__
+#define UACCUM_IBIT __UACCUM_IBIT__
+#else
+#define UACCUM_IBIT 16
+#endif // UACCUM_IBIT
+
+#define UACCUM_MIN 0.0UK
+
+#ifdef __UACCUM_MAX__
+#define UACCUM_MAX __UACCUM_MAX__
+#else
+#define UACCUM_MAX 0x1.FFFFFFFEp+15UK
+#endif // UACCUM_MAX
+
+#ifdef __UACCUM_EPSILON__
+#define UACCUM_EPSILON __UACCUM_EPSILON__
+#else
+#define UACCUM_EPSILON 0x1.0p-16UK
+#endif // UACCUM_EPSILON
+
+#ifdef __LACCUM_FBIT__
+#define LACCUM_FBIT __LACCUM_FBIT__
+#else
+#define LACCUM_FBIT 31
+#endif // LACCUM_FBIT
+
+#ifdef __LACCUM_IBIT__
+#define LACCUM_IBIT __LACCUM_IBIT__
+#else
+#define LACCUM_IBIT 32
+#endif // LACCUM_IBIT
+
+#ifdef __LACCUM_MIN__
+#define LACCUM_MIN __LACCUM_MIN__
+#else
+#define LACCUM_MIN (-0x1.0p+31LK - 0x1.0p+31LK)
+#endif // LACCUM_MIN
+
+#ifdef __LACCUM_MAX__
+#define LACCUM_MAX __LACCUM_MAX__
+#else
+#define LACCUM_MAX 0x1.FFFFFFFFFFFFFFFCp+31LK
+#endif // LACCUM_MAX
+
+#ifdef __LACCUM_EPSILON__
+#define LACCUM_EPSILON __LACCUM_EPSILON__
+#else
+#define LACCUM_EPSILON 0x1.0p-31LK
+#endif // LACCUM_EPSILON
+
+#ifdef __ULACCUM_FBIT__
+#define ULACCUM_FBIT __ULACCUM_FBIT__
+#else
+#define ULACCUM_FBIT 32
+#endif // ULACCUM_FBIT
+
+#ifdef __ULACCUM_IBIT__
+#define ULACCUM_IBIT __ULACCUM_IBIT__
+#else
+#define ULACCUM_IBIT 32
+#endif // ULACCUM_IBIT
+
+#define ULACCUM_MIN 0.0ULK
+
+#ifdef __ULACCUM_MAX__
+#define ULACCUM_MAX __ULACCUM_MAX__
+#else
+#define ULACCUM_MAX 0x1.FFFFFFFFFFFFFFFEp+31ULK
+#endif // ULACCUM_MAX
+
+#ifdef __ULACCUM_EPSILON__
+#define ULACCUM_EPSILON __ULACCUM_EPSILON__
+#else
+#define ULACCUM_EPSILON 0x1.0p-32ULK
+#endif // ULACCUM_EPSILON
+
+#define absfx(x)                                                               \
+  _Generic((x),                                                                \
+      fract: absr,                                                             \
+      short fract: abshr,                                                      \
+      long fract: abslr,                                                       \
+      accum: absk,                                                             \
+      short accum: abshk,                                                      \
+      long accum: abslk)(x)
+
+#define countlsfx(x)                                                           \
+  _Generic((x),                                                                \
+      fract: countlsr,                                                         \
+      short fract: countlshr,                                                  \
+      long fract: countlslr,                                                   \
+      accum: countlsk,                                                         \
+      short accum: countlshk,                                                  \
+      long accum: countlslk,                                                   \
+      unsigned fract: countlsur,                                               \
+      unsigned short fract: countlsuhr,                                        \
+      unsigned long fract: countlsulr,                                         \
+      unsigned accum: countlsuk,                                               \
+      unsigned short accum: countlsuhk,                                        \
+      unsigned long accum: countlsulk)(x)
+
+#define roundfx(x, y)                                                          \
+  _Generic((x),                                                                \
+      fract: roundr,                                                           \
+      short fract: roundhr,                                                    \
+      long fract: roundlr,                                                     \
+      accum: roundk,                                                           \
+      short accum: roundhk,                                                    \
+      long accum: roundlk,                                                     \
+      unsigned fract: roundur,                                                 \
+      unsigned short fract: rounduhr,                                          \
+      unsigned long fract: roundulr,                                           \
+      unsigned accum: rounduk,                                                 \
+      unsigned short accum: rounduhk,                                          \
+      unsigned long accum: roundulk)(x, y)
+
+#endif // LIBC_COMPILER_HAS_FIXED_POINT
+
+#endif // LLVM_LIBC_MACROS_STDFIX_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/stdint-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/stdint-macros.h
new file mode 100644
index 000000000000..1d5da2b783b6
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/stdint-macros.h
@@ -0,0 +1,878 @@
+//===-- Definition of macros from stdint.h --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_STDINT_MACROS_H
+#define LLVM_LIBC_MACROS_STDINT_MACROS_H
+
+// These definitions are copied directly from the clang implementation located
+// at 'clang/lib/Headers/stdint.h'. We provide it here again for compatibility.
+
+/* C99 7.18.1.1 Exact-width integer types.
+ * C99 7.18.1.2 Minimum-width integer types.
+ * C99 7.18.1.3 Fastest minimum-width integer types.
+ *
+ * The standard requires that exact-width type be defined for 8-, 16-, 32-, and
+ * 64-bit types if they are implemented. Other exact width types are optional.
+ * This implementation defines an exact-width types for every integer width
+ * that is represented in the standard integer types.
+ *
+ * The standard also requires minimum-width types be defined for 8-, 16-, 32-,
+ * and 64-bit widths regardless of whether there are corresponding exact-width
+ * types.
+ *
+ * To accommodate targets that are missing types that are exactly 8, 16, 32, or
+ * 64 bits wide, this implementation takes an approach of cascading
+ * redefinitions, redefining __int_leastN_t to successively smaller exact-width
+ * types. It is therefore important that the types are defined in order of
+ * descending widths.
+ *
+ * We currently assume that the minimum-width types and the fastest
+ * minimum-width types are the same. This is allowed by the standard, but is
+ * suboptimal.
+ *
+ * In violation of the standard, some targets do not implement a type that is
+ * wide enough to represent all of the required widths (8-, 16-, 32-, 64-bit).
+ * To accommodate these targets, a required minimum-width type is only
+ * defined if there exists an exact-width type of equal or greater width.
+ */
+
+#ifdef __INT64_TYPE__
+#ifndef __int8_t_defined /* glibc sys/types.h also defines int64_t*/
+typedef __INT64_TYPE__ int64_t;
+#endif /* __int8_t_defined */
+typedef __UINT64_TYPE__ uint64_t;
+#undef __int_least64_t
+#define __int_least64_t int64_t
+#undef __uint_least64_t
+#define __uint_least64_t uint64_t
+#undef __int_least32_t
+#define __int_least32_t int64_t
+#undef __uint_least32_t
+#define __uint_least32_t uint64_t
+#undef __int_least16_t
+#define __int_least16_t int64_t
+#undef __uint_least16_t
+#define __uint_least16_t uint64_t
+#undef __int_least8_t
+#define __int_least8_t int64_t
+#undef __uint_least8_t
+#define __uint_least8_t uint64_t
+#endif /* __INT64_TYPE__ */
+
+#ifdef __int_least64_t
+typedef __int_least64_t int_least64_t;
+typedef __uint_least64_t uint_least64_t;
+typedef __int_least64_t int_fast64_t;
+typedef __uint_least64_t uint_fast64_t;
+#endif /* __int_least64_t */
+
+#ifdef __INT56_TYPE__
+typedef __INT56_TYPE__ int56_t;
+typedef __UINT56_TYPE__ uint56_t;
+typedef int56_t int_least56_t;
+typedef uint56_t uint_least56_t;
+typedef int56_t int_fast56_t;
+typedef uint56_t uint_fast56_t;
+#undef __int_least32_t
+#define __int_least32_t int56_t
+#undef __uint_least32_t
+#define __uint_least32_t uint56_t
+#undef __int_least16_t
+#define __int_least16_t int56_t
+#undef __uint_least16_t
+#define __uint_least16_t uint56_t
+#undef __int_least8_t
+#define __int_least8_t int56_t
+#undef __uint_least8_t
+#define __uint_least8_t uint56_t
+#endif /* __INT56_TYPE__ */
+
+#ifdef __INT48_TYPE__
+typedef __INT48_TYPE__ int48_t;
+typedef __UINT48_TYPE__ uint48_t;
+typedef int48_t int_least48_t;
+typedef uint48_t uint_least48_t;
+typedef int48_t int_fast48_t;
+typedef uint48_t uint_fast48_t;
+#undef __int_least32_t
+#define __int_least32_t int48_t
+#undef __uint_least32_t
+#define __uint_least32_t uint48_t
+#undef __int_least16_t
+#define __int_least16_t int48_t
+#undef __uint_least16_t
+#define __uint_least16_t uint48_t
+#undef __int_least8_t
+#define __int_least8_t int48_t
+#undef __uint_least8_t
+#define __uint_least8_t uint48_t
+#endif /* __INT48_TYPE__ */
+
+#ifdef __INT40_TYPE__
+typedef __INT40_TYPE__ int40_t;
+typedef __UINT40_TYPE__ uint40_t;
+typedef int40_t int_least40_t;
+typedef uint40_t uint_least40_t;
+typedef int40_t int_fast40_t;
+typedef uint40_t uint_fast40_t;
+#undef __int_least32_t
+#define __int_least32_t int40_t
+#undef __uint_least32_t
+#define __uint_least32_t uint40_t
+#undef __int_least16_t
+#define __int_least16_t int40_t
+#undef __uint_least16_t
+#define __uint_least16_t uint40_t
+#undef __int_least8_t
+#define __int_least8_t int40_t
+#undef __uint_least8_t
+#define __uint_least8_t uint40_t
+#endif /* __INT40_TYPE__ */
+
+#ifdef __INT32_TYPE__
+
+#ifndef __int8_t_defined /* glibc sys/types.h also defines int32_t*/
+typedef __INT32_TYPE__ int32_t;
+#endif /* __int8_t_defined */
+
+#ifndef __uint32_t_defined /* more glibc compatibility */
+#define __uint32_t_defined
+typedef __UINT32_TYPE__ uint32_t;
+#endif /* __uint32_t_defined */
+
+#undef __int_least32_t
+#define __int_least32_t int32_t
+#undef __uint_least32_t
+#define __uint_least32_t uint32_t
+#undef __int_least16_t
+#define __int_least16_t int32_t
+#undef __uint_least16_t
+#define __uint_least16_t uint32_t
+#undef __int_least8_t
+#define __int_least8_t int32_t
+#undef __uint_least8_t
+#define __uint_least8_t uint32_t
+#endif /* __INT32_TYPE__ */
+
+#ifdef __int_least32_t
+typedef __int_least32_t int_least32_t;
+typedef __uint_least32_t uint_least32_t;
+typedef __int_least32_t int_fast32_t;
+typedef __uint_least32_t uint_fast32_t;
+#endif /* __int_least32_t */
+
+#ifdef __INT24_TYPE__
+typedef __INT24_TYPE__ int24_t;
+typedef __UINT24_TYPE__ uint24_t;
+typedef int24_t int_least24_t;
+typedef uint24_t uint_least24_t;
+typedef int24_t int_fast24_t;
+typedef uint24_t uint_fast24_t;
+#undef __int_least16_t
+#define __int_least16_t int24_t
+#undef __uint_least16_t
+#define __uint_least16_t uint24_t
+#undef __int_least8_t
+#define __int_least8_t int24_t
+#undef __uint_least8_t
+#define __uint_least8_t uint24_t
+#endif /* __INT24_TYPE__ */
+
+#ifdef __INT16_TYPE__
+#ifndef __int8_t_defined /* glibc sys/types.h also defines int16_t*/
+typedef __INT16_TYPE__ int16_t;
+#endif /* __int8_t_defined */
+typedef __UINT16_TYPE__ uint16_t;
+#undef __int_least16_t
+#define __int_least16_t int16_t
+#undef __uint_least16_t
+#define __uint_least16_t uint16_t
+#undef __int_least8_t
+#define __int_least8_t int16_t
+#undef __uint_least8_t
+#define __uint_least8_t uint16_t
+#endif /* __INT16_TYPE__ */
+
+#ifdef __int_least16_t
+typedef __int_least16_t int_least16_t;
+typedef __uint_least16_t uint_least16_t;
+typedef __int_least16_t int_fast16_t;
+typedef __uint_least16_t uint_fast16_t;
+#endif /* __int_least16_t */
+
+#ifdef __INT8_TYPE__
+#ifndef __int8_t_defined /* glibc sys/types.h also defines int8_t*/
+typedef __INT8_TYPE__ int8_t;
+#endif /* __int8_t_defined */
+typedef __UINT8_TYPE__ uint8_t;
+#undef __int_least8_t
+#define __int_least8_t int8_t
+#undef __uint_least8_t
+#define __uint_least8_t uint8_t
+#endif /* __INT8_TYPE__ */
+
+#ifdef __int_least8_t
+typedef __int_least8_t int_least8_t;
+typedef __uint_least8_t uint_least8_t;
+typedef __int_least8_t int_fast8_t;
+typedef __uint_least8_t uint_fast8_t;
+#endif /* __int_least8_t */
+
+/* prevent glibc sys/types.h from defining conflicting types */
+#ifndef __int8_t_defined
+#define __int8_t_defined
+#endif /* __int8_t_defined */
+
+/* C99 7.18.1.4 Integer types capable of holding object pointers.
+ */
+#define __stdint_join3(a, b, c) a##b##c
+
+#ifndef _INTPTR_T
+#ifndef __intptr_t_defined
+typedef __INTPTR_TYPE__ intptr_t;
+#define __intptr_t_defined
+#define _INTPTR_T
+#endif
+#endif
+
+#ifndef _UINTPTR_T
+typedef __UINTPTR_TYPE__ uintptr_t;
+#define _UINTPTR_T
+#endif
+
+/* C99 7.18.1.5 Greatest-width integer types.
+ */
+typedef __INTMAX_TYPE__ intmax_t;
+typedef __UINTMAX_TYPE__ uintmax_t;
+
+/* C99 7.18.4 Macros for minimum-width integer constants.
+ *
+ * The standard requires that integer constant macros be defined for all the
+ * minimum-width types defined above. As 8-, 16-, 32-, and 64-bit minimum-width
+ * types are required, the corresponding integer constant macros are defined
+ * here. This implementation also defines minimum-width types for every other
+ * integer width that the target implements, so corresponding macros are
+ * defined below, too.
+ *
+ * These macros are defined using the same successive-shrinking approach as
+ * the type definitions above. It is likewise important that macros are defined
+ * in order of decending width.
+ *
+ * Note that C++ should not check __STDC_CONSTANT_MACROS here, contrary to the
+ * claims of the C standard (see C++ 18.3.1p2, [cstdint.syn]).
+ */
+
+#define __int_c_join(a, b) a##b
+#define __int_c(v, suffix) __int_c_join(v, suffix)
+#define __uint_c(v, suffix) __int_c_join(v##U, suffix)
+
+#ifdef __INT64_TYPE__
+#undef __int64_c_suffix
+#undef __int32_c_suffix
+#undef __int16_c_suffix
+#undef __int8_c_suffix
+#ifdef __INT64_C_SUFFIX__
+#define __int64_c_suffix __INT64_C_SUFFIX__
+#define __int32_c_suffix __INT64_C_SUFFIX__
+#define __int16_c_suffix __INT64_C_SUFFIX__
+#define __int8_c_suffix __INT64_C_SUFFIX__
+#endif /* __INT64_C_SUFFIX__ */
+#endif /* __INT64_TYPE__ */
+
+#ifdef __int_least64_t
+#ifdef __int64_c_suffix
+#define INT64_C(v) __int_c(v, __int64_c_suffix)
+#define UINT64_C(v) __uint_c(v, __int64_c_suffix)
+#else
+#define INT64_C(v) v
+#define UINT64_C(v) v##U
+#endif /* __int64_c_suffix */
+#endif /* __int_least64_t */
+
+#ifdef __INT56_TYPE__
+#undef __int32_c_suffix
+#undef __int16_c_suffix
+#undef __int8_c_suffix
+#ifdef __INT56_C_SUFFIX__
+#define INT56_C(v) __int_c(v, __INT56_C_SUFFIX__)
+#define UINT56_C(v) __uint_c(v, __INT56_C_SUFFIX__)
+#define __int32_c_suffix __INT56_C_SUFFIX__
+#define __int16_c_suffix __INT56_C_SUFFIX__
+#define __int8_c_suffix __INT56_C_SUFFIX__
+#else
+#define INT56_C(v) v
+#define UINT56_C(v) v##U
+#endif /* __INT56_C_SUFFIX__ */
+#endif /* __INT56_TYPE__ */
+
+#ifdef __INT48_TYPE__
+#undef __int32_c_suffix
+#undef __int16_c_suffix
+#undef __int8_c_suffix
+#ifdef __INT48_C_SUFFIX__
+#define INT48_C(v) __int_c(v, __INT48_C_SUFFIX__)
+#define UINT48_C(v) __uint_c(v, __INT48_C_SUFFIX__)
+#define __int32_c_suffix __INT48_C_SUFFIX__
+#define __int16_c_suffix __INT48_C_SUFFIX__
+#define __int8_c_suffix __INT48_C_SUFFIX__
+#else
+#define INT48_C(v) v
+#define UINT48_C(v) v##U
+#endif /* __INT48_C_SUFFIX__ */
+#endif /* __INT48_TYPE__ */
+
+#ifdef __INT40_TYPE__
+#undef __int32_c_suffix
+#undef __int16_c_suffix
+#undef __int8_c_suffix
+#ifdef __INT40_C_SUFFIX__
+#define INT40_C(v) __int_c(v, __INT40_C_SUFFIX__)
+#define UINT40_C(v) __uint_c(v, __INT40_C_SUFFIX__)
+#define __int32_c_suffix __INT40_C_SUFFIX__
+#define __int16_c_suffix __INT40_C_SUFFIX__
+#define __int8_c_suffix __INT40_C_SUFFIX__
+#else
+#define INT40_C(v) v
+#define UINT40_C(v) v##U
+#endif /* __INT40_C_SUFFIX__ */
+#endif /* __INT40_TYPE__ */
+
+#ifdef __INT32_TYPE__
+#undef __int32_c_suffix
+#undef __int16_c_suffix
+#undef __int8_c_suffix
+#ifdef __INT32_C_SUFFIX__
+#define __int32_c_suffix __INT32_C_SUFFIX__
+#define __int16_c_suffix __INT32_C_SUFFIX__
+#define __int8_c_suffix __INT32_C_SUFFIX__
+#endif /* __INT32_C_SUFFIX__ */
+#endif /* __INT32_TYPE__ */
+
+#ifdef __int_least32_t
+#ifdef __int32_c_suffix
+#define INT32_C(v) __int_c(v, __int32_c_suffix)
+#define UINT32_C(v) __uint_c(v, __int32_c_suffix)
+#else
+#define INT32_C(v) v
+#define UINT32_C(v) v##U
+#endif /* __int32_c_suffix */
+#endif /* __int_least32_t */
+
+#ifdef __INT24_TYPE__
+#undef __int16_c_suffix
+#undef __int8_c_suffix
+#ifdef __INT24_C_SUFFIX__
+#define INT24_C(v) __int_c(v, __INT24_C_SUFFIX__)
+#define UINT24_C(v) __uint_c(v, __INT24_C_SUFFIX__)
+#define __int16_c_suffix __INT24_C_SUFFIX__
+#define __int8_c_suffix __INT24_C_SUFFIX__
+#else
+#define INT24_C(v) v
+#define UINT24_C(v) v##U
+#endif /* __INT24_C_SUFFIX__ */
+#endif /* __INT24_TYPE__ */
+
+#ifdef __INT16_TYPE__
+#undef __int16_c_suffix
+#undef __int8_c_suffix
+#ifdef __INT16_C_SUFFIX__
+#define __int16_c_suffix __INT16_C_SUFFIX__
+#define __int8_c_suffix __INT16_C_SUFFIX__
+#endif /* __INT16_C_SUFFIX__ */
+#endif /* __INT16_TYPE__ */
+
+#ifdef __int_least16_t
+#ifdef __int16_c_suffix
+#define INT16_C(v) __int_c(v, __int16_c_suffix)
+#define UINT16_C(v) __uint_c(v, __int16_c_suffix)
+#else
+#define INT16_C(v) v
+#define UINT16_C(v) v##U
+#endif /* __int16_c_suffix */
+#endif /* __int_least16_t */
+
+#ifdef __INT8_TYPE__
+#undef __int8_c_suffix
+#ifdef __INT8_C_SUFFIX__
+#define __int8_c_suffix __INT8_C_SUFFIX__
+#endif /* __INT8_C_SUFFIX__ */
+#endif /* __INT8_TYPE__ */
+
+#ifdef __int_least8_t
+#ifdef __int8_c_suffix
+#define INT8_C(v) __int_c(v, __int8_c_suffix)
+#define UINT8_C(v) __uint_c(v, __int8_c_suffix)
+#else
+#define INT8_C(v) v
+#define UINT8_C(v) v##U
+#endif /* __int8_c_suffix */
+#endif /* __int_least8_t */
+
+/* C99 7.18.2.1 Limits of exact-width integer types.
+ * C99 7.18.2.2 Limits of minimum-width integer types.
+ * C99 7.18.2.3 Limits of fastest minimum-width integer types.
+ *
+ * The presence of limit macros are completely optional in C99.  This
+ * implementation defines limits for all of the types (exact- and
+ * minimum-width) that it defines above, using the limits of the minimum-width
+ * type for any types that do not have exact-width representations.
+ *
+ * As in the type definitions, this section takes an approach of
+ * successive-shrinking to determine which limits to use for the standard (8,
+ * 16, 32, 64) bit widths when they don't have exact representations. It is
+ * therefore important that the definitions be kept in order of decending
+ * widths.
+ *
+ * Note that C++ should not check __STDC_LIMIT_MACROS here, contrary to the
+ * claims of the C standard (see C++ 18.3.1p2, [cstdint.syn]).
+ */
+
+#ifdef __INT64_TYPE__
+#define INT64_MAX INT64_C(9223372036854775807)
+#define INT64_MIN (-INT64_C(9223372036854775807) - 1)
+#define UINT64_MAX UINT64_C(18446744073709551615)
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
+#define UINT64_WIDTH 64
+#define INT64_WIDTH UINT64_WIDTH
+
+#define __UINT_LEAST64_WIDTH UINT64_WIDTH
+#undef __UINT_LEAST32_WIDTH
+#define __UINT_LEAST32_WIDTH UINT64_WIDTH
+#undef __UINT_LEAST16_WIDTH
+#define __UINT_LEAST16_WIDTH UINT64_WIDTH
+#undef __UINT_LEAST8_MAX
+#define __UINT_LEAST8_MAX UINT64_MAX
+#endif /* __STDC_VERSION__ */
+
+#define __INT_LEAST64_MIN INT64_MIN
+#define __INT_LEAST64_MAX INT64_MAX
+#define __UINT_LEAST64_MAX UINT64_MAX
+#undef __INT_LEAST32_MIN
+#define __INT_LEAST32_MIN INT64_MIN
+#undef __INT_LEAST32_MAX
+#define __INT_LEAST32_MAX INT64_MAX
+#undef __UINT_LEAST32_MAX
+#define __UINT_LEAST32_MAX UINT64_MAX
+#undef __INT_LEAST16_MIN
+#define __INT_LEAST16_MIN INT64_MIN
+#undef __INT_LEAST16_MAX
+#define __INT_LEAST16_MAX INT64_MAX
+#undef __UINT_LEAST16_MAX
+#define __UINT_LEAST16_MAX UINT64_MAX
+#undef __INT_LEAST8_MIN
+#define __INT_LEAST8_MIN INT64_MIN
+#undef __INT_LEAST8_MAX
+#define __INT_LEAST8_MAX INT64_MAX
+#undef __UINT_LEAST8_MAX
+#define __UINT_LEAST8_MAX UINT64_MAX
+#endif /* __INT64_TYPE__ */
+
+#ifdef __INT_LEAST64_MIN
+#define INT_LEAST64_MIN __INT_LEAST64_MIN
+#define INT_LEAST64_MAX __INT_LEAST64_MAX
+#define UINT_LEAST64_MAX __UINT_LEAST64_MAX
+#define INT_FAST64_MIN __INT_LEAST64_MIN
+#define INT_FAST64_MAX __INT_LEAST64_MAX
+#define UINT_FAST64_MAX __UINT_LEAST64_MAX
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
+#define UINT_LEAST64_WIDTH __UINT_LEAST64_WIDTH
+#define INT_LEAST64_WIDTH UINT_LEAST64_WIDTH
+#define UINT_FAST64_WIDTH __UINT_LEAST64_WIDTH
+#define INT_FAST64_WIDTH UINT_FAST64_WIDTH
+#endif /* __STDC_VERSION__ */
+#endif /* __INT_LEAST64_MIN */
+
+#ifdef __INT56_TYPE__
+#define INT56_MAX INT56_C(36028797018963967)
+#define INT56_MIN (-INT56_C(36028797018963967) - 1)
+#define UINT56_MAX UINT56_C(72057594037927935)
+#define INT_LEAST56_MIN INT56_MIN
+#define INT_LEAST56_MAX INT56_MAX
+#define UINT_LEAST56_MAX UINT56_MAX
+#define INT_FAST56_MIN INT56_MIN
+#define INT_FAST56_MAX INT56_MAX
+#define UINT_FAST56_MAX UINT56_MAX
+
+#undef __INT_LEAST32_MIN
+#define __INT_LEAST32_MIN INT56_MIN
+#undef __INT_LEAST32_MAX
+#define __INT_LEAST32_MAX INT56_MAX
+#undef __UINT_LEAST32_MAX
+#define __UINT_LEAST32_MAX UINT56_MAX
+#undef __INT_LEAST16_MIN
+#define __INT_LEAST16_MIN INT56_MIN
+#undef __INT_LEAST16_MAX
+#define __INT_LEAST16_MAX INT56_MAX
+#undef __UINT_LEAST16_MAX
+#define __UINT_LEAST16_MAX UINT56_MAX
+#undef __INT_LEAST8_MIN
+#define __INT_LEAST8_MIN INT56_MIN
+#undef __INT_LEAST8_MAX
+#define __INT_LEAST8_MAX INT56_MAX
+#undef __UINT_LEAST8_MAX
+#define __UINT_LEAST8_MAX UINT56_MAX
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
+#define UINT56_WIDTH 56
+#define INT56_WIDTH UINT56_WIDTH
+#define UINT_LEAST56_WIDTH UINT56_WIDTH
+#define INT_LEAST56_WIDTH UINT_LEAST56_WIDTH
+#define UINT_FAST56_WIDTH UINT56_WIDTH
+#define INT_FAST56_WIDTH UINT_FAST56_WIDTH
+#undef __UINT_LEAST32_WIDTH
+#define __UINT_LEAST32_WIDTH UINT56_WIDTH
+#undef __UINT_LEAST16_WIDTH
+#define __UINT_LEAST16_WIDTH UINT56_WIDTH
+#undef __UINT_LEAST8_WIDTH
+#define __UINT_LEAST8_WIDTH UINT56_WIDTH
+#endif /* __STDC_VERSION__ */
+#endif /* __INT56_TYPE__ */
+
+#ifdef __INT48_TYPE__
+#define INT48_MAX INT48_C(140737488355327)
+#define INT48_MIN (-INT48_C(140737488355327) - 1)
+#define UINT48_MAX UINT48_C(281474976710655)
+#define INT_LEAST48_MIN INT48_MIN
+#define INT_LEAST48_MAX INT48_MAX
+#define UINT_LEAST48_MAX UINT48_MAX
+#define INT_FAST48_MIN INT48_MIN
+#define INT_FAST48_MAX INT48_MAX
+#define UINT_FAST48_MAX UINT48_MAX
+
+#undef __INT_LEAST32_MIN
+#define __INT_LEAST32_MIN INT48_MIN
+#undef __INT_LEAST32_MAX
+#define __INT_LEAST32_MAX INT48_MAX
+#undef __UINT_LEAST32_MAX
+#define __UINT_LEAST32_MAX UINT48_MAX
+#undef __INT_LEAST16_MIN
+#define __INT_LEAST16_MIN INT48_MIN
+#undef __INT_LEAST16_MAX
+#define __INT_LEAST16_MAX INT48_MAX
+#undef __UINT_LEAST16_MAX
+#define __UINT_LEAST16_MAX UINT48_MAX
+#undef __INT_LEAST8_MIN
+#define __INT_LEAST8_MIN INT48_MIN
+#undef __INT_LEAST8_MAX
+#define __INT_LEAST8_MAX INT48_MAX
+#undef __UINT_LEAST8_MAX
+#define __UINT_LEAST8_MAX UINT48_MAX
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
+#define UINT48_WIDTH 48
+#define INT48_WIDTH UINT48_WIDTH
+#define UINT_LEAST48_WIDTH UINT48_WIDTH
+#define INT_LEAST48_WIDTH UINT_LEAST48_WIDTH
+#define UINT_FAST48_WIDTH UINT48_WIDTH
+#define INT_FAST48_WIDTH UINT_FAST48_WIDTH
+#undef __UINT_LEAST32_WIDTH
+#define __UINT_LEAST32_WIDTH UINT48_WIDTH
+#undef __UINT_LEAST16_WIDTH
+#define __UINT_LEAST16_WIDTH UINT48_WIDTH
+#undef __UINT_LEAST8_WIDTH
+#define __UINT_LEAST8_WIDTH UINT48_WIDTH
+#endif /* __STDC_VERSION__ */
+#endif /* __INT48_TYPE__ */
+
+#ifdef __INT40_TYPE__
+#define INT40_MAX INT40_C(549755813887)
+#define INT40_MIN (-INT40_C(549755813887) - 1)
+#define UINT40_MAX UINT40_C(1099511627775)
+#define INT_LEAST40_MIN INT40_MIN
+#define INT_LEAST40_MAX INT40_MAX
+#define UINT_LEAST40_MAX UINT40_MAX
+#define INT_FAST40_MIN INT40_MIN
+#define INT_FAST40_MAX INT40_MAX
+#define UINT_FAST40_MAX UINT40_MAX
+
+#undef __INT_LEAST32_MIN
+#define __INT_LEAST32_MIN INT40_MIN
+#undef __INT_LEAST32_MAX
+#define __INT_LEAST32_MAX INT40_MAX
+#undef __UINT_LEAST32_MAX
+#define __UINT_LEAST32_MAX UINT40_MAX
+#undef __INT_LEAST16_MIN
+#define __INT_LEAST16_MIN INT40_MIN
+#undef __INT_LEAST16_MAX
+#define __INT_LEAST16_MAX INT40_MAX
+#undef __UINT_LEAST16_MAX
+#define __UINT_LEAST16_MAX UINT40_MAX
+#undef __INT_LEAST8_MIN
+#define __INT_LEAST8_MIN INT40_MIN
+#undef __INT_LEAST8_MAX
+#define __INT_LEAST8_MAX INT40_MAX
+#undef __UINT_LEAST8_MAX
+#define __UINT_LEAST8_MAX UINT40_MAX
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
+#define UINT40_WIDTH 40
+#define INT40_WIDTH UINT40_WIDTH
+#define UINT_LEAST40_WIDTH UINT40_WIDTH
+#define INT_LEAST40_WIDTH UINT_LEAST40_WIDTH
+#define UINT_FAST40_WIDTH UINT40_WIDTH
+#define INT_FAST40_WIDTH UINT_FAST40_WIDTH
+#undef __UINT_LEAST32_WIDTH
+#define __UINT_LEAST32_WIDTH UINT40_WIDTH
+#undef __UINT_LEAST16_WIDTH
+#define __UINT_LEAST16_WIDTH UINT40_WIDTH
+#undef __UINT_LEAST8_WIDTH
+#define __UINT_LEAST8_WIDTH UINT40_WIDTH
+#endif /* __STDC_VERSION__ */
+#endif /* __INT40_TYPE__ */
+
+#ifdef __INT32_TYPE__
+#define INT32_MAX INT32_C(2147483647)
+#define INT32_MIN (-INT32_C(2147483647) - 1)
+#define UINT32_MAX UINT32_C(4294967295)
+
+#undef __INT_LEAST32_MIN
+#define __INT_LEAST32_MIN INT32_MIN
+#undef __INT_LEAST32_MAX
+#define __INT_LEAST32_MAX INT32_MAX
+#undef __UINT_LEAST32_MAX
+#define __UINT_LEAST32_MAX UINT32_MAX
+#undef __INT_LEAST16_MIN
+#define __INT_LEAST16_MIN INT32_MIN
+#undef __INT_LEAST16_MAX
+#define __INT_LEAST16_MAX INT32_MAX
+#undef __UINT_LEAST16_MAX
+#define __UINT_LEAST16_MAX UINT32_MAX
+#undef __INT_LEAST8_MIN
+#define __INT_LEAST8_MIN INT32_MIN
+#undef __INT_LEAST8_MAX
+#define __INT_LEAST8_MAX INT32_MAX
+#undef __UINT_LEAST8_MAX
+#define __UINT_LEAST8_MAX UINT32_MAX
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
+#define UINT32_WIDTH 32
+#define INT32_WIDTH UINT32_WIDTH
+#undef __UINT_LEAST32_WIDTH
+#define __UINT_LEAST32_WIDTH UINT32_WIDTH
+#undef __UINT_LEAST16_WIDTH
+#define __UINT_LEAST16_WIDTH UINT32_WIDTH
+#undef __UINT_LEAST8_WIDTH
+#define __UINT_LEAST8_WIDTH UINT32_WIDTH
+#endif /* __STDC_VERSION__ */
+#endif /* __INT32_TYPE__ */
+
+#ifdef __INT_LEAST32_MIN
+#define INT_LEAST32_MIN __INT_LEAST32_MIN
+#define INT_LEAST32_MAX __INT_LEAST32_MAX
+#define UINT_LEAST32_MAX __UINT_LEAST32_MAX
+#define INT_FAST32_MIN __INT_LEAST32_MIN
+#define INT_FAST32_MAX __INT_LEAST32_MAX
+#define UINT_FAST32_MAX __UINT_LEAST32_MAX
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
+#define UINT_LEAST32_WIDTH __UINT_LEAST32_WIDTH
+#define INT_LEAST32_WIDTH UINT_LEAST32_WIDTH
+#define UINT_FAST32_WIDTH __UINT_LEAST32_WIDTH
+#define INT_FAST32_WIDTH UINT_FAST32_WIDTH
+#endif /* __STDC_VERSION__ */
+#endif /* __INT_LEAST32_MIN */
+
+#ifdef __INT24_TYPE__
+#define INT24_MAX INT24_C(8388607)
+#define INT24_MIN (-INT24_C(8388607) - 1)
+#define UINT24_MAX UINT24_C(16777215)
+#define INT_LEAST24_MIN INT24_MIN
+#define INT_LEAST24_MAX INT24_MAX
+#define UINT_LEAST24_MAX UINT24_MAX
+#define INT_FAST24_MIN INT24_MIN
+#define INT_FAST24_MAX INT24_MAX
+#define UINT_FAST24_MAX UINT24_MAX
+
+#undef __INT_LEAST16_MIN
+#define __INT_LEAST16_MIN INT24_MIN
+#undef __INT_LEAST16_MAX
+#define __INT_LEAST16_MAX INT24_MAX
+#undef __UINT_LEAST16_MAX
+#define __UINT_LEAST16_MAX UINT24_MAX
+#undef __INT_LEAST8_MIN
+#define __INT_LEAST8_MIN INT24_MIN
+#undef __INT_LEAST8_MAX
+#define __INT_LEAST8_MAX INT24_MAX
+#undef __UINT_LEAST8_MAX
+#define __UINT_LEAST8_MAX UINT24_MAX
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
+#define UINT24_WIDTH 24
+#define INT24_WIDTH UINT24_WIDTH
+#define UINT_LEAST24_WIDTH UINT24_WIDTH
+#define INT_LEAST24_WIDTH UINT_LEAST24_WIDTH
+#define UINT_FAST24_WIDTH UINT24_WIDTH
+#define INT_FAST24_WIDTH UINT_FAST24_WIDTH
+#undef __UINT_LEAST16_WIDTH
+#define __UINT_LEAST16_WIDTH UINT24_WIDTH
+#undef __UINT_LEAST8_WIDTH
+#define __UINT_LEAST8_WIDTH UINT24_WIDTH
+#endif /* __STDC_VERSION__ */
+#endif /* __INT24_TYPE__ */
+
+#ifdef __INT16_TYPE__
+#define INT16_MAX INT16_C(32767)
+#define INT16_MIN (-INT16_C(32767) - 1)
+#define UINT16_MAX UINT16_C(65535)
+
+#undef __INT_LEAST16_MIN
+#define __INT_LEAST16_MIN INT16_MIN
+#undef __INT_LEAST16_MAX
+#define __INT_LEAST16_MAX INT16_MAX
+#undef __UINT_LEAST16_MAX
+#define __UINT_LEAST16_MAX UINT16_MAX
+#undef __INT_LEAST8_MIN
+#define __INT_LEAST8_MIN INT16_MIN
+#undef __INT_LEAST8_MAX
+#define __INT_LEAST8_MAX INT16_MAX
+#undef __UINT_LEAST8_MAX
+#define __UINT_LEAST8_MAX UINT16_MAX
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
+#define UINT16_WIDTH 16
+#define INT16_WIDTH UINT16_WIDTH
+#undef __UINT_LEAST16_WIDTH
+#define __UINT_LEAST16_WIDTH UINT16_WIDTH
+#undef __UINT_LEAST8_WIDTH
+#define __UINT_LEAST8_WIDTH UINT16_WIDTH
+#endif /* __STDC_VERSION__ */
+#endif /* __INT16_TYPE__ */
+
+#ifdef __INT_LEAST16_MIN
+#define INT_LEAST16_MIN __INT_LEAST16_MIN
+#define INT_LEAST16_MAX __INT_LEAST16_MAX
+#define UINT_LEAST16_MAX __UINT_LEAST16_MAX
+#define INT_FAST16_MIN __INT_LEAST16_MIN
+#define INT_FAST16_MAX __INT_LEAST16_MAX
+#define UINT_FAST16_MAX __UINT_LEAST16_MAX
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
+#define UINT_LEAST16_WIDTH __UINT_LEAST16_WIDTH
+#define INT_LEAST16_WIDTH UINT_LEAST16_WIDTH
+#define UINT_FAST16_WIDTH __UINT_LEAST16_WIDTH
+#define INT_FAST16_WIDTH UINT_FAST16_WIDTH
+#endif /* __STDC_VERSION__ */
+#endif /* __INT_LEAST16_MIN */
+
+#ifdef __INT8_TYPE__
+#define INT8_MAX INT8_C(127)
+#define INT8_MIN (-INT8_C(127) - 1)
+#define UINT8_MAX UINT8_C(255)
+
+#undef __INT_LEAST8_MIN
+#define __INT_LEAST8_MIN INT8_MIN
+#undef __INT_LEAST8_MAX
+#define __INT_LEAST8_MAX INT8_MAX
+#undef __UINT_LEAST8_MAX
+#define __UINT_LEAST8_MAX UINT8_MAX
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
+#define UINT8_WIDTH 8
+#define INT8_WIDTH UINT8_WIDTH
+#undef __UINT_LEAST8_WIDTH
+#define __UINT_LEAST8_WIDTH UINT8_WIDTH
+#endif /* __STDC_VERSION__ */
+#endif /* __INT8_TYPE__ */
+
+#ifdef __INT_LEAST8_MIN
+#define INT_LEAST8_MIN __INT_LEAST8_MIN
+#define INT_LEAST8_MAX __INT_LEAST8_MAX
+#define UINT_LEAST8_MAX __UINT_LEAST8_MAX
+#define INT_FAST8_MIN __INT_LEAST8_MIN
+#define INT_FAST8_MAX __INT_LEAST8_MAX
+#define UINT_FAST8_MAX __UINT_LEAST8_MAX
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
+#define UINT_LEAST8_WIDTH __UINT_LEAST8_WIDTH
+#define INT_LEAST8_WIDTH UINT_LEAST8_WIDTH
+#define UINT_FAST8_WIDTH __UINT_LEAST8_WIDTH
+#define INT_FAST8_WIDTH UINT_FAST8_WIDTH
+#endif /* __STDC_VERSION__ */
+#endif /* __INT_LEAST8_MIN */
+
+/* Some utility macros */
+#define __INTN_MIN(n) __stdint_join3(INT, n, _MIN)
+#define __INTN_MAX(n) __stdint_join3(INT, n, _MAX)
+#define __UINTN_MAX(n) __stdint_join3(UINT, n, _MAX)
+#define __INTN_C(n, v) __stdint_join3(INT, n, _C(v))
+#define __UINTN_C(n, v) __stdint_join3(UINT, n, _C(v))
+
+/* C99 7.18.2.4 Limits of integer types capable of holding object pointers. */
+/* C99 7.18.3 Limits of other integer types. */
+
+#define INTPTR_MIN (-__INTPTR_MAX__ - 1)
+#define INTPTR_MAX __INTPTR_MAX__
+#define UINTPTR_MAX __UINTPTR_MAX__
+#define PTRDIFF_MIN (-__PTRDIFF_MAX__ - 1)
+#define PTRDIFF_MAX __PTRDIFF_MAX__
+#define SIZE_MAX __SIZE_MAX__
+
+/* C23 7.22.2.4 Width of integer types capable of holding object pointers. */
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
+/* NB: The C standard requires that these be the same value, but the compiler
+   exposes separate internal width macros. */
+#define INTPTR_WIDTH __INTPTR_WIDTH__
+#define UINTPTR_WIDTH __UINTPTR_WIDTH__
+#endif
+
+/* ISO9899:2011 7.20 (C11 Annex K): Define RSIZE_MAX if __STDC_WANT_LIB_EXT1__
+ * is enabled. */
+#if defined(__STDC_WANT_LIB_EXT1__) && __STDC_WANT_LIB_EXT1__ >= 1
+#define RSIZE_MAX (SIZE_MAX >> 1)
+#endif
+
+/* C99 7.18.2.5 Limits of greatest-width integer types. */
+#define INTMAX_MIN (-__INTMAX_MAX__ - 1)
+#define INTMAX_MAX __INTMAX_MAX__
+#define UINTMAX_MAX __UINTMAX_MAX__
+
+/* C23 7.22.2.5 Width of greatest-width integer types. */
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
+/* NB: The C standard requires that these be the same value, but the compiler
+   exposes separate internal width macros. */
+#define INTMAX_WIDTH __INTMAX_WIDTH__
+#define UINTMAX_WIDTH __UINTMAX_WIDTH__
+#endif
+
+/* C99 7.18.3 Limits of other integer types. */
+#define SIG_ATOMIC_MIN __INTN_MIN(__SIG_ATOMIC_WIDTH__)
+#define SIG_ATOMIC_MAX __INTN_MAX(__SIG_ATOMIC_WIDTH__)
+#ifdef __WINT_UNSIGNED__
+#define WINT_MIN __UINTN_C(__WINT_WIDTH__, 0)
+#define WINT_MAX __UINTN_MAX(__WINT_WIDTH__)
+#else
+#define WINT_MIN __INTN_MIN(__WINT_WIDTH__)
+#define WINT_MAX __INTN_MAX(__WINT_WIDTH__)
+#endif
+
+#ifndef WCHAR_MAX
+#define WCHAR_MAX __WCHAR_MAX__
+#endif
+#ifndef WCHAR_MIN
+#if __WCHAR_MAX__ == __INTN_MAX(__WCHAR_WIDTH__)
+#define WCHAR_MIN __INTN_MIN(__WCHAR_WIDTH__)
+#else
+#define WCHAR_MIN __UINTN_C(__WCHAR_WIDTH__, 0)
+#endif
+#endif
+
+/* 7.18.4.2 Macros for greatest-width integer constants. */
+#define INTMAX_C(v) __int_c(v, __INTMAX_C_SUFFIX__)
+#define UINTMAX_C(v) __int_c(v, __UINTMAX_C_SUFFIX__)
+
+/* C23 7.22.3.x Width of other integer types. */
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
+#define PTRDIFF_WIDTH __PTRDIFF_WIDTH__
+#define SIG_ATOMIC_WIDTH __SIG_ATOMIC_WIDTH__
+#define SIZE_WIDTH __SIZE_WIDTH__
+#define WCHAR_WIDTH __WCHAR_WIDTH__
+#define WINT_WIDTH __WINT_WIDTH__
+#endif
+#endif // LLVM_LIBC_MACROS_STDINT_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/stdio-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/stdio-macros.h
new file mode 100644
index 000000000000..96f0e6933ade
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/stdio-macros.h
@@ -0,0 +1,58 @@
+//===-- Macros defined in stdio.h header file -----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_STDIO_MACROS_H
+#define LLVM_LIBC_MACROS_STDIO_MACROS_H
+
+#include "../llvm-libc-types/FILE.h"
+
+#ifdef __cplusplus
+extern "C" FILE *stdin;
+extern "C" FILE *stdout;
+extern "C" FILE *stderr;
+#else
+extern FILE *stdin;
+extern FILE *stdout;
+extern FILE *stderr;
+#endif
+
+#ifndef stdin
+#define stdin stdin
+#endif
+
+#ifndef stdout
+#define stdout stdout
+#endif
+
+#ifndef stderr
+#define stderr stderr
+#endif
+
+#ifndef EOF
+#define EOF (-1)
+#endif
+
+#define BUFSIZ 1024
+
+#define _IONBF 2
+#define _IOLBF 1
+#define _IOFBF 0
+
+#ifndef SEEK_SET
+#define SEEK_SET 0
+#endif
+
+#ifndef SEEK_CUR
+#define SEEK_CUR 1
+#endif
+
+#ifndef SEEK_END
+#define SEEK_END 2
+#endif
+
+#endif // LLVM_LIBC_MACROS_STDIO_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/stdlib-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/stdlib-macros.h
new file mode 100644
index 000000000000..2565c76be3c5
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/stdlib-macros.h
@@ -0,0 +1,27 @@
+//===-- Definition of macros to be used with stdlib functions ----------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_STDLIB_MACROS_H
+#define LLVM_LIBC_MACROS_STDLIB_MACROS_H
+
+#ifndef NULL
+#define __need_NULL
+#include <stddef.h>
+#endif // NULL
+
+#define EXIT_SUCCESS 0
+#define EXIT_FAILURE 1
+
+#ifndef MB_CUR_MAX
+// We only support the "C" locale right now, so this is a constant byte.
+#define MB_CUR_MAX 1
+#endif // MB_CUR_MAX
+
+#define RAND_MAX 2147483647
+
+#endif // LLVM_LIBC_MACROS_STDLIB_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/sys-auxv-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-auxv-macros.h
new file mode 100644
index 000000000000..2dcaa2f1a8ee
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-auxv-macros.h
@@ -0,0 +1,43 @@
+//===-- Macros defined in sys/auxv.h header file --------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_SYS_AUXV_MACROS_H
+#define LLVM_LIBC_MACROS_SYS_AUXV_MACROS_H
+
+// Macros defining the aux vector indexes.
+#define AT_NULL 0
+#define AT_IGNORE 1
+#define AT_EXECFD 2
+#define AT_PHDR 3
+#define AT_PHENT 4
+#define AT_PHNUM 5
+#define AT_PAGESZ 6
+#define AT_BASE 7
+#define AT_FLAGS 8
+#define AT_ENTRY 9
+#define AT_NOTELF 10
+#define AT_UID 11
+#define AT_EUID 12
+#define AT_GID 13
+#define AT_EGID 14
+#define AT_PLATFORM 15
+#define AT_HWCAP 16
+#define AT_CLKTCK 17
+
+#define AT_SECURE 23
+#define AT_BASE_PLATFORM 24
+#define AT_RANDOM 25
+#define AT_HWCAP2 26
+
+#define AT_EXECFN 31
+
+#ifndef AT_MINSIGSTKSZ
+#define AT_MINSIGSTKSZ 51
+#endif
+
+#endif // LLVM_LIBC_MACROS_SYS_AUXV_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/sys-epoll-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-epoll-macros.h
new file mode 100644
index 000000000000..8212df252b8e
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-epoll-macros.h
@@ -0,0 +1,16 @@
+//===-- Macros defined in sys/epoll.h header file -------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_SYS_EPOLL_MACROS_H
+#define LLVM_LIBC_MACROS_SYS_EPOLL_MACROS_H
+
+#ifdef __linux__
+#include "linux/sys-epoll-macros.h"
+#endif
+
+#endif // LLVM_LIBC_MACROS_SYS_EPOLL_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/sys-ioctl-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-ioctl-macros.h
new file mode 100644
index 000000000000..4a5f9651231f
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-ioctl-macros.h
@@ -0,0 +1,16 @@
+//===-- Macros defined in sys/ioctl.h header file -------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_SYS_IOCTL_MACROS_H
+#define LLVM_LIBC_MACROS_SYS_IOCTL_MACROS_H
+
+#ifdef __linux__
+#include "linux/sys-ioctl-macros.h"
+#endif
+
+#endif // LLVM_LIBC_MACROS_SYS_IOCTL_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/sys-mman-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-mman-macros.h
new file mode 100644
index 000000000000..a6dc6d96b5b7
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-mman-macros.h
@@ -0,0 +1,48 @@
+//===-- Macros defined in sys/mman.h header file --------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_SYS_MMAN_MACROS_H
+#define LLVM_LIBC_MACROS_SYS_MMAN_MACROS_H
+
+// Use definitions from <linux/mman.h> to dispatch arch-specific flag values.
+// For example, MCL_CURRENT/MCL_FUTURE/MCL_ONFAULT are different on different
+// architectures.
+#if __has_include(<linux/mman.h>)
+#include <linux/mman.h>
+#else
+#error "cannot use <sys/mman.h> without proper system headers."
+#endif
+
+// Some posix standard flags may not be defined in system headers.
+// Posix mmap flags.
+#ifndef MAP_FAILED
+#define MAP_FAILED ((void *)-1)
+#endif
+
+// Posix memory advise flags. (posix_madvise)
+#ifndef POSIX_MADV_NORMAL
+#define POSIX_MADV_NORMAL MADV_NORMAL
+#endif
+
+#ifndef POSIX_MADV_SEQUENTIAL
+#define POSIX_MADV_SEQUENTIAL MADV_SEQUENTIAL
+#endif
+
+#ifndef POSIX_MADV_RANDOM
+#define POSIX_MADV_RANDOM MADV_RANDOM
+#endif
+
+#ifndef POSIX_MADV_WILLNEED
+#define POSIX_MADV_WILLNEED MADV_WILLNEED
+#endif
+
+#ifndef POSIX_MADV_DONTNEED
+#define POSIX_MADV_DONTNEED MADV_DONTNEED
+#endif
+
+#endif // LLVM_LIBC_MACROS_SYS_MMAN_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/sys-queue-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-queue-macros.h
new file mode 100644
index 000000000000..21e80f42a91d
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-queue-macros.h
@@ -0,0 +1,262 @@
+//===-- Macros defined in sys/queue.h header file -------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_SYS_QUEUE_MACROS_H
+#define LLVM_LIBC_MACROS_SYS_QUEUE_MACROS_H
+
+#include "containerof-macro.h"
+#include "null-macro.h"
+
+#ifdef __cplusplus
+#define QUEUE_TYPEOF(type) type
+#else
+#define QUEUE_TYPEOF(type) struct type
+#endif
+
+// Singly-linked list definitions.
+
+#define SLIST_HEAD(name, type)                                                 \
+  struct name {                                                                \
+    struct type *slh_first;                                                    \
+  }
+
+#define SLIST_CLASS_HEAD(name, type)                                           \
+  struct name {                                                                \
+    class type *slh_first;                                                     \
+  }
+
+#define SLIST_HEAD_INITIALIZER(head)                                           \
+  { NULL }
+
+#define SLIST_ENTRY(type)                                                      \
+  struct {                                                                     \
+    struct type *next;                                                         \
+  }
+
+#define SLIST_CLASS_ENTRY(type)                                                \
+  struct {                                                                     \
+    class type *next;                                                          \
+  }
+
+// Singly-linked list access methods.
+
+#define SLIST_EMPTY(head) ((head)->slh_first == NULL)
+#define SLIST_FIRST(head) ((head)->slh_first)
+#define SLIST_NEXT(elem, field) ((elem)->field.next)
+
+#define SLIST_FOREACH(var, head, field)                                        \
+  for ((var) = SLIST_FIRST(head); (var); (var) = SLIST_NEXT(var, field))
+
+#define SLIST_FOREACH_FROM(var, head, field)                                   \
+  if (!(var))                                                                  \
+    (var) = SLIST_FIRST(head);                                                 \
+  for (; (var); (var) = SLIST_NEXT(var, field))
+
+#define SLIST_FOREACH_SAFE(var, head, field, tvar)                             \
+  for ((var) = SLIST_FIRST(head);                                              \
+       (var) && ((tvar) = SLIST_NEXT(var, field), 1); (var) = (tvar))
+
+#define SLIST_FOREACH_FROM_SAFE(var, head, field, tvar)                        \
+  if (!(var))                                                                  \
+    (var) = SLIST_FIRST(head);                                                 \
+  for (; (var) && ((tvar) = SLIST_NEXT(var, field), 1); (var) = (tvar))
+
+// Singly-linked list functions.
+
+#define SLIST_CONCAT(head1, head2, type, field)                                \
+  do {                                                                         \
+    if (SLIST_EMPTY(head1)) {                                                  \
+      if ((SLIST_FIRST(head1) = SLIST_FIRST(head2)) != NULL)                   \
+        SLIST_INIT(head2);                                                     \
+    } else if (!SLIST_EMPTY(head2)) {                                          \
+      QUEUE_TYPEOF(type) *cur = SLIST_FIRST(head1);                            \
+      while (SLIST_NEXT(cur, field) != NULL)                                   \
+        cur = SLIST_NEXT(cur, field);                                          \
+      SLIST_NEXT(cur, field) = SLIST_FIRST(head2);                             \
+      SLIST_INIT(head2);                                                       \
+    }                                                                          \
+  } while (0)
+
+#define SLIST_INIT(head)                                                       \
+  do {                                                                         \
+    SLIST_FIRST(head) = NULL;                                                  \
+  } while (0)
+
+#define SLIST_INSERT_AFTER(slistelem, elem, field)                             \
+  do {                                                                         \
+    SLIST_NEXT(elem, field) = SLIST_NEXT(slistelem, field);                    \
+    SLIST_NEXT(slistelem, field) = (elem);                                     \
+  } while (0)
+
+#define SLIST_INSERT_HEAD(head, elem, field)                                   \
+  do {                                                                         \
+    SLIST_NEXT(elem, field) = SLIST_FIRST(head);                               \
+    SLIST_FIRST(head) = (elem);                                                \
+  } while (0)
+
+#define SLIST_REMOVE(head, elem, type, field)                                  \
+  do {                                                                         \
+    if (SLIST_FIRST(head) == (elem)) {                                         \
+      SLIST_REMOVE_HEAD(head, field);                                          \
+    } else {                                                                   \
+      QUEUE_TYPEOF(type) *cur = SLIST_FIRST(head);                             \
+      while (SLIST_NEXT(cur, field) != (elem))                                 \
+        cur = SLIST_NEXT(cur, field);                                          \
+      SLIST_REMOVE_AFTER(cur, field);                                          \
+    }                                                                          \
+  } while (0)
+
+#define SLIST_REMOVE_AFTER(elem, field)                                        \
+  do {                                                                         \
+    SLIST_NEXT(elem, field) = SLIST_NEXT(SLIST_NEXT(elem, field), field);      \
+  } while (0)
+
+#define SLIST_REMOVE_HEAD(head, field)                                         \
+  do {                                                                         \
+    SLIST_FIRST(head) = SLIST_NEXT(SLIST_FIRST(head), field);                  \
+  } while (0)
+
+#define SLIST_SWAP(head1, head2, type)                                         \
+  do {                                                                         \
+    QUEUE_TYPEOF(type) *first = SLIST_FIRST(head1);                            \
+    SLIST_FIRST(head1) = SLIST_FIRST(head2);                                   \
+    SLIST_FIRST(head2) = first;                                                \
+  } while (0)
+
+// Singly-linked tail queue definitions.
+
+#define STAILQ_HEAD(name, type)                                                \
+  struct name {                                                                \
+    struct type *stqh_first;                                                   \
+    struct type **stqh_last;                                                   \
+  }
+
+#define STAILQ_CLASS_HEAD(name, type)                                          \
+  struct name {                                                                \
+    class type *stqh_first;                                                    \
+    class type **stqh_last;                                                    \
+  }
+
+#define STAILQ_HEAD_INITIALIZER(head)                                          \
+  { NULL, &(head).stqh_first }
+
+#define STAILQ_ENTRY(type)                                                     \
+  struct {                                                                     \
+    struct type *next;                                                         \
+  }
+
+#define STAILQ_CLASS_ENTRY(type)                                               \
+  struct {                                                                     \
+    class type *next;                                                          \
+  }
+
+// Singly-linked tail queue access methods.
+
+#define STAILQ_EMPTY(head) ((head)->stqh_first == NULL)
+#define STAILQ_FIRST(head) ((head)->stqh_first)
+#define STAILQ_LAST(head, type, field)                                         \
+  (STAILQ_EMPTY(head)                                                          \
+       ? NULL                                                                  \
+       : __containerof((head)->stqh_last, QUEUE_TYPEOF(type), field.next))
+#define STAILQ_NEXT(elem, field) ((elem)->field.next)
+
+#define STAILQ_FOREACH(var, head, field)                                       \
+  for ((var) = STAILQ_FIRST(head); (var); (var) = STAILQ_NEXT(var, field))
+
+#define STAILQ_FOREACH_FROM(var, head, field)                                  \
+  if (!(var))                                                                  \
+    (var) = STAILQ_FIRST(head);                                                \
+  for (; (var); (var) = STAILQ_NEXT(var, field))
+
+#define STAILQ_FOREACH_SAFE(var, head, field, tvar)                            \
+  for ((var) = STAILQ_FIRST(head);                                             \
+       (var) && ((tvar) = STAILQ_NEXT(var, field), 1); (var) = (tvar))
+
+#define STAILQ_FOREACH_FROM_SAFE(var, head, field, tvar)                       \
+  if (!(var))                                                                  \
+    (var) = STAILQ_FIRST(head);                                                \
+  for (; (var) && ((tvar) = STAILQ_NEXT(var, field), 1); (var) = (tvar))
+
+// Singly-linked tail queue functions.
+
+#define STAILQ_CONCAT(head1, head2, type, field)                               \
+  do {                                                                         \
+    if (!STAILQ_EMPTY(head2)) {                                                \
+      *(head1)->stqh_last = (head2)->stqh_first;                               \
+      (head1)->stqh_last = (head2)->stqh_last;                                 \
+      STAILQ_INIT(head2);                                                      \
+    }                                                                          \
+  } while (0)
+
+#define STAILQ_INIT(head)                                                      \
+  do {                                                                         \
+    STAILQ_FIRST(head) = NULL;                                                 \
+    (head)->stqh_last = &STAILQ_FIRST(head);                                   \
+  } while (0)
+
+#define STAILQ_INSERT_AFTER(head, listelem, elem, field)                       \
+  do {                                                                         \
+    if ((STAILQ_NEXT(elem, field) = STAILQ_NEXT(listelem, field)) == NULL)     \
+      (head)->stqh_last = &STAILQ_NEXT(elem, field);                           \
+    STAILQ_NEXT(listelem, field) = (elem);                                     \
+  } while (0)
+
+#define STAILQ_INSERT_HEAD(head, elem, field)                                  \
+  do {                                                                         \
+    if ((STAILQ_NEXT(elem, field) = STAILQ_FIRST(head)) == NULL)               \
+      (head)->stqh_last = &STAILQ_NEXT(elem, field);                           \
+    STAILQ_FIRST(head) = (elem);                                               \
+  } while (0)
+
+#define STAILQ_INSERT_TAIL(head, elem, field)                                  \
+  do {                                                                         \
+    STAILQ_NEXT(elem, field) = NULL;                                           \
+    *(head)->stqh_last = (elem);                                               \
+    (head)->stqh_last = &STAILQ_NEXT(elem, field);                             \
+  } while (0)
+
+#define STAILQ_REMOVE(head, elem, type, field)                                 \
+  do {                                                                         \
+    if (STAILQ_FIRST(head) == (elem)) {                                        \
+      STAILQ_REMOVE_HEAD(head, field);                                         \
+    } else {                                                                   \
+      QUEUE_TYPEOF(type) *cur = STAILQ_FIRST(head);                            \
+      while (STAILQ_NEXT(cur, field) != (elem))                                \
+        cur = STAILQ_NEXT(cur, field);                                         \
+      STAILQ_REMOVE_AFTER(head, cur, field);                                   \
+    }                                                                          \
+  } while (0)
+
+#define STAILQ_REMOVE_AFTER(head, elem, field)                                 \
+  do {                                                                         \
+    if ((STAILQ_NEXT(elem, field) =                                            \
+             STAILQ_NEXT(STAILQ_NEXT(elem, field), field)) == NULL)            \
+      (head)->stqh_last = &STAILQ_NEXT(elem, field);                           \
+  } while (0)
+
+#define STAILQ_REMOVE_HEAD(head, field)                                        \
+  do {                                                                         \
+    if ((STAILQ_FIRST(head) = STAILQ_NEXT(STAILQ_FIRST(head), field)) == NULL) \
+      (head)->stqh_last = &STAILQ_FIRST(head);                                 \
+  } while (0)
+
+#define STAILQ_SWAP(head1, head2, type)                                        \
+  do {                                                                         \
+    QUEUE_TYPEOF(type) *first = STAILQ_FIRST(head1);                           \
+    QUEUE_TYPEOF(type) **last = (head1)->stqh_last;                            \
+    STAILQ_FIRST(head1) = STAILQ_FIRST(head2);                                 \
+    (head1)->stqh_last = (head2)->stqh_last;                                   \
+    STAILQ_FIRST(head2) = first;                                               \
+    (head2)->stqh_last = last;                                                 \
+    if (STAILQ_EMPTY(head1))                                                   \
+      (head1)->stqh_last = &STAILQ_FIRST(head1);                               \
+    if (STAILQ_EMPTY(head2))                                                   \
+      (head2)->stqh_last = &STAILQ_FIRST(head2);                               \
+  } while (0)
+
+#endif // LLVM_LIBC_MACROS_SYS_QUEUE_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/sys-random-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-random-macros.h
new file mode 100644
index 000000000000..9b1a8edb4f79
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-random-macros.h
@@ -0,0 +1,16 @@
+//===-- Macros defined in sys/random.h header file ------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_SYS_RANDOM_MACROS_H
+#define LLVM_LIBC_MACROS_SYS_RANDOM_MACROS_H
+
+#ifdef __linux__
+#include "linux/sys-random-macros.h"
+#endif
+
+#endif // LLVM_LIBC_MACROS_SYS_RANDOM_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/sys-resource-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-resource-macros.h
new file mode 100644
index 000000000000..1ce01cdd1e83
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-resource-macros.h
@@ -0,0 +1,16 @@
+//===-- Macros defined in sys/resource.h header file ----------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_SYS_RESOURCE_MACROS_H
+#define LLVM_LIBC_MACROS_SYS_RESOURCE_MACROS_H
+
+#ifdef __linux__
+#include "linux/sys-resource-macros.h"
+#endif
+
+#endif // LLVM_LIBC_MACROS_SYS_RESOURCE_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/sys-select-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-select-macros.h
new file mode 100644
index 000000000000..d54e5300d12e
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-select-macros.h
@@ -0,0 +1,35 @@
+//===-- Macros defined in sys/select.h header file ------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_SYS_SELECT_MACROS_H
+#define LLVM_LIBC_MACROS_SYS_SELECT_MACROS_H
+
+#define FD_SETSIZE 1024
+#define __FD_SET_WORD_TYPE unsigned long
+#define __FD_SET_WORD_SIZE (sizeof(__FD_SET_WORD_TYPE) * 8)
+#define __FD_SET_ARRAYSIZE (FD_SETSIZE / __FD_SET_WORD_SIZE)
+
+#define FD_ZERO(set)                                                           \
+  do {                                                                         \
+    unsigned i;                                                                \
+    for (i = 0; i < __FD_SET_ARRAYSIZE; ++i)                                   \
+      (set)->__set[i] = 0;                                                     \
+  } while (0)
+
+#define __FD_WORD(fd) ((fd) / __FD_SET_WORD_SIZE)
+#define __FD_MASK(fd)                                                          \
+  ((__FD_SET_WORD_TYPE)1) << ((__FD_SET_WORD_TYPE)((fd) % __FD_SET_WORD_SIZE))
+
+#define FD_CLR(fd, set) (void)((set)->__set[__FD_WORD(fd)] &= ~__FD_MASK(fd))
+
+#define FD_SET(fd, set) (void)((set)->__set[__FD_WORD(fd)] |= __FD_MASK(fd))
+
+#define FD_ISSET(fd, set)                                                      \
+  (int)(((set)->__set[__FD_WORD(fd)] & __FD_MASK(fd)) != 0)
+
+#endif // LLVM_LIBC_MACROS_SYS_SELECT_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/sys-socket-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-socket-macros.h
new file mode 100644
index 000000000000..6b1d28070b43
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-socket-macros.h
@@ -0,0 +1,16 @@
+//===-- Macros defined in sys/socket.h header file ------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_SYS_SOCKET_MACROS_H
+#define LLVM_LIBC_MACROS_SYS_SOCKET_MACROS_H
+
+#ifdef __linux__
+#include "linux/sys-socket-macros.h"
+#endif
+
+#endif // LLVM_LIBC_MACROS_SYS_SOCKET_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/sys-stat-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-stat-macros.h
new file mode 100644
index 000000000000..c47c9612705e
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-stat-macros.h
@@ -0,0 +1,16 @@
+//===-- Macros defined in sys/stat.h header file --------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_SYS_STAT_MACROS_H
+#define LLVM_LIBC_MACROS_SYS_STAT_MACROS_H
+
+#ifdef __linux__
+#include "linux/sys-stat-macros.h"
+#endif
+
+#endif // LLVM_LIBC_MACROS_SYS_STAT_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/sys-time-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-time-macros.h
new file mode 100644
index 000000000000..36d7d5adafc9
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-time-macros.h
@@ -0,0 +1,16 @@
+//===-- Macros defined in sys/time.h header file --------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_SYS_TIME_MACROS_H
+#define LLVM_LIBC_MACROS_SYS_TIME_MACROS_H
+
+#ifdef __linux__
+#include "linux/sys-time-macros.h"
+#endif
+
+#endif // LLVM_LIBC_MACROS_SYS_TIME_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/sys-wait-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-wait-macros.h
new file mode 100644
index 000000000000..c418a7930b69
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/sys-wait-macros.h
@@ -0,0 +1,16 @@
+//===-- Macros defined in sys/wait.h header file --------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_SYS_WAIT_MACROS_H
+#define LLVM_LIBC_MACROS_SYS_WAIT_MACROS_H
+
+#ifdef __linux__
+#include "linux/sys-wait-macros.h"
+#endif
+
+#endif // LLVM_LIBC_MACROS_SYS_WAIT_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/sysexits-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/sysexits-macros.h
new file mode 100644
index 000000000000..52f838788632
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/sysexits-macros.h
@@ -0,0 +1,29 @@
+//===-- Macros defined in sysexits.h header file --------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SYSEXITS_MACROS_H
+#define SYSEXITS_MACROS_H
+
+#define EX_OK 0           // Successful termination
+#define EX_USAGE 64       // Command line usage error
+#define EX_DATAERR 65     // Data format error
+#define EX_NOINPUT 66     // Cannot open input
+#define EX_NOUSER 67      // Addressee unknown
+#define EX_NOHOST 68      // Host name unknown
+#define EX_UNAVAILABLE 69 // Service unavailable
+#define EX_SOFTWARE 70    // Internal software error
+#define EX_OSERR 71       // Operating system error
+#define EX_OSFILE 72      // System file error
+#define EX_CANTCREAT 73   // Cannot create (user) output file
+#define EX_IOERR 74       // Input/output error
+#define EX_TEMPFAIL 75    // Temporary failure, try again
+#define EX_PROTOCOL 76    // Remote protocol error
+#define EX_NOPERM 77      // Permission denied
+#define EX_CONFIG 78      // Configuration error
+
+#endif // SYSEXITS_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/termios-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/termios-macros.h
new file mode 100644
index 000000000000..1067e8a57474
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/termios-macros.h
@@ -0,0 +1,16 @@
+//===-- Macros defined in termios.h header file ---------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_TERMIOS_MACROS_H
+#define LLVM_LIBC_MACROS_TERMIOS_MACROS_H
+
+#ifdef __linux__
+#include "linux/termios-macros.h"
+#endif
+
+#endif // LLVM_LIBC_MACROS_TERMIOS_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/time-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/time-macros.h
new file mode 100644
index 000000000000..30e0a310a548
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/time-macros.h
@@ -0,0 +1,21 @@
+#ifndef LLVM_LIBC_MACROS_TIME_MACROS_H
+#define LLVM_LIBC_MACROS_TIME_MACROS_H
+
+#if defined(__AMDGPU__) || defined(__NVPTX__)
+#include "gpu/time-macros.h"
+#elif defined(__linux__)
+#include "linux/time-macros.h"
+#elif defined(__ELF__)
+#include "baremetal/time-macros.h"
+#else
+#define CLOCKS_PER_SEC 1000000
+#endif
+
+#define CLK_TCK CLOCKS_PER_SEC
+
+#define TIME_UTC 1
+#define TIME_MONOTONIC 2
+#define TIME_ACTIVE 3
+#define TIME_THREAD_ACTIVE 4
+
+#endif // LLVM_LIBC_MACROS_TIME_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/unistd-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/unistd-macros.h
new file mode 100644
index 000000000000..e09dada04a19
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/unistd-macros.h
@@ -0,0 +1,12 @@
+#ifndef LLVM_LIBC_MACROS_UNISTD_MACROS_H
+#define LLVM_LIBC_MACROS_UNISTD_MACROS_H
+
+#ifdef __linux__
+#include "linux/unistd-macros.h"
+#endif
+
+#define STDIN_FILENO 0
+#define STDOUT_FILENO 1
+#define STDERR_FILENO 2
+
+#endif // LLVM_LIBC_MACROS_UNISTD_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/wchar-macros.h b/contrib/llvm-project/libc/include/llvm-libc-macros/wchar-macros.h
new file mode 100644
index 000000000000..2a0cabd6133a
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/wchar-macros.h
@@ -0,0 +1,18 @@
+//===-- Macros defined in wchar.h header file -----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_WCHAR_MACROS_H
+#define LLVM_LIBC_MACROS_WCHAR_MACROS_H
+
+#include "../llvm-libc-types/wint_t.h"
+
+#ifndef WEOF
+#define WEOF ((wint_t)(0xffffffffu))
+#endif
+
+#endif // LLVM_LIBC_MACROS_WCHAR_MACROS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-macros/windows/time-macros-ext.h b/contrib/llvm-project/libc/include/llvm-libc-macros/windows/time-macros-ext.h
new file mode 100644
index 000000000000..71d914b45187
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-macros/windows/time-macros-ext.h
@@ -0,0 +1,17 @@
+//===-- Windows Time Macros Extension -------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_WINDOWS_TIME_MACROS_EXT_H
+#define LLVM_LIBC_MACROS_WINDOWS_TIME_MACROS_EXT_H
+
+#define CLOCK_MONOTONIC 0
+#define CLOCK_REALTIME 1
+#define CLOCK_PROCESS_CPUTIME_ID 2
+#define CLOCK_THREAD_CPUTIME_ID 3
+
+#endif // LLVM_LIBC_MACROS_WINDOWS_TIME_MACROS_EXT_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/ACTION.h b/contrib/llvm-project/libc/include/llvm-libc-types/ACTION.h
new file mode 100644
index 000000000000..1ddce208df1c
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/ACTION.h
@@ -0,0 +1,14 @@
+//===-- Definition of ACTION type -----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_ACTION_H
+#define LLVM_LIBC_TYPES_ACTION_H
+
+typedef enum { FIND, ENTER } ACTION;
+
+#endif // LLVM_LIBC_TYPES_ACTION_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/DIR.h b/contrib/llvm-project/libc/include/llvm-libc-types/DIR.h
new file mode 100644
index 000000000000..855446db6f53
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/DIR.h
@@ -0,0 +1,14 @@
+//===-- Definition of the type DIR ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_DIR_H
+#define LLVM_LIBC_TYPES_DIR_H
+
+typedef struct DIR DIR;
+
+#endif // LLVM_LIBC_TYPES_DIR_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_ALLOCATE_TYPE.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_ALLOCATE_TYPE.h
new file mode 100644
index 000000000000..90f23969678f
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_ALLOCATE_TYPE.h
@@ -0,0 +1,19 @@
+//===-- Definition of EFI_ALLOCATE_TYPE type ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_ALLOCATE_TYPE_H
+#define LLVM_LIBC_TYPES_EFI_ALLOCATE_TYPE_H
+
+typedef enum {
+  AllocateAnyPages,
+  AllocateMaxAddress,
+  AllocateAddress,
+  MaxAllocateType
+} EFI_ALLOCATE_TYPE;
+
+#endif // LLVM_LIBC_TYPES_EFI_ALLOCATE_TYPE_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_BOOT_SERVICES.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_BOOT_SERVICES.h
new file mode 100644
index 000000000000..8b7a6aadd7a2
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_BOOT_SERVICES.h
@@ -0,0 +1,250 @@
+//===-- Definition of EFI_BOOT_SERVICES type ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_BOOT_SERVICES_H
+#define LLVM_LIBC_TYPES_EFI_BOOT_SERVICES_H
+
+#include "../llvm-libc-macros/EFIAPI-macros.h"
+#include "EFI_ALLOCATE_TYPE.h"
+#include "EFI_DEVICE_PATH_PROTOCOL.h"
+#include "EFI_EVENT.h"
+#include "EFI_GUID.h"
+#include "EFI_INTERFACE_TYPE.h"
+#include "EFI_LOCATE_SEARCH_TYPE.h"
+#include "EFI_MEMORY_DESCRIPTOR.h"
+#include "EFI_MEMORY_TYPE.h"
+#include "EFI_OPEN_PROTOCOL_INFORMATION_ENTRY.h"
+#include "EFI_PHYSICAL_ADDRESS.h"
+#include "EFI_STATUS.h"
+#include "EFI_TABLE_HEADER.h"
+#include "EFI_TIMER_DELAY.h"
+#include "EFI_TPL.h"
+#include "char16_t.h"
+#include "size_t.h"
+
+#define EFI_BOOT_SERVICES_SIGNATURE 0x56524553544f4f42
+#define EFI_BOOT_SERVICES_REVISION EFI_SPECIFICATION_VERSION
+
+typedef EFI_TPL(EFIAPI *EFI_RAISE_TPL)(EFI_TPL NewTpl);
+typedef void(EFIAPI *EFI_RESTORE_TPL)(EFI_TPL OldTpl);
+
+typedef EFI_STATUS(EFIAPI *EFI_ALLOCATE_PAGES)(EFI_ALLOCATE_TYPE Type,
+                                               EFI_MEMORY_TYPE MemoryType,
+                                               size_t Pages,
+                                               EFI_PHYSICAL_ADDRESS *Memory);
+typedef EFI_STATUS(EFIAPI *EFI_FREE_PAGES)(EFI_PHYSICAL_ADDRESS Memory,
+                                           size_t Pages);
+typedef EFI_STATUS(EFIAPI *EFI_GET_MEMORY_MAP)(size_t *MemoryMapSize,
+                                               EFI_MEMORY_DESCRIPTOR *MemoryMap,
+                                               size_t *MapKey,
+                                               size_t *DescriptorSize,
+                                               uint32_t *DescriptorVersion);
+
+typedef EFI_STATUS(EFIAPI *EFI_ALLOCATE_POOL)(EFI_MEMORY_TYPE PoolType,
+                                              size_t Size, void **Buffer);
+typedef EFI_STATUS(EFIAPI *EFI_FREE_POOL)(void *Buffer);
+
+typedef void(EFIAPI *EFI_EVENT_NOTIFY)(EFI_EVENT Event, void *Context);
+
+typedef EFI_STATUS(EFIAPI *EFI_CREATE_EVENT)(uint32_t Type, EFI_TPL NotifyTpl,
+                                             EFI_EVENT_NOTIFY NotifyFunction,
+                                             void *NotifyContext,
+                                             EFI_EVENT *Event);
+typedef EFI_STATUS(EFIAPI *EFI_SET_TIMER)(EFI_EVENT Event, EFI_TIMER_DELAY Type,
+                                          uint64_t TriggerTime);
+typedef EFI_STATUS(EFIAPI *EFI_WAIT_FOR_EVENT)(size_t NumberOfEvents,
+                                               EFI_EVENT *Event, size_t *Index);
+typedef EFI_STATUS(EFIAPI *EFI_SIGNAL_EVENT)(EFI_EVENT Event);
+typedef EFI_STATUS(EFIAPI *EFI_CLOSE_EVENT)(EFI_EVENT Event);
+typedef EFI_STATUS(EFIAPI *EFI_CHECK_EVENT)(EFI_EVENT Event);
+
+typedef EFI_STATUS(EFIAPI *EFI_INSTALL_PROTOCOL_INTERFACE)(
+    EFI_HANDLE *Handle, EFI_GUID *Protocol, EFI_INTERFACE_TYPE InterfaceType,
+    void *Interface);
+typedef EFI_STATUS(EFIAPI *EFI_REINSTALL_PROTOCOL_INTERFACE)(
+    EFI_HANDLE Handle, EFI_GUID *Protocol, void *OldInterface,
+    void *NewInterface);
+typedef EFI_STATUS(EFIAPI *EFI_UNINSTALL_PROTOCOL_INTERFACE)(EFI_HANDLE Handle,
+                                                             EFI_GUID *Protocol,
+                                                             void *Interface);
+
+typedef EFI_STATUS(EFIAPI *EFI_HANDLE_PROTOCOL)(EFI_HANDLE Handle,
+                                                EFI_GUID *Protocol,
+                                                void **Interface);
+typedef EFI_STATUS(EFIAPI *EFI_REGISTER_PROTOCOL_NOTIFY)(EFI_GUID *Protocol,
+                                                         EFI_EVENT Event,
+                                                         void **Registration);
+
+typedef EFI_STATUS(EFIAPI *EFI_LOCATE_HANDLE)(EFI_LOCATE_SEARCH_TYPE SearchType,
+                                              EFI_GUID *Protocol,
+                                              void *SearchKey,
+                                              size_t *BufferSize,
+                                              EFI_HANDLE *Buffer);
+typedef EFI_STATUS(EFIAPI *EFI_LOCATE_DEVICE_PATH)(
+    EFI_GUID *Protocol, EFI_DEVICE_PATH_PROTOCOL **DevicePath,
+    EFI_HANDLE *Device);
+
+typedef EFI_STATUS(EFIAPI *EFI_INSTALL_CONFIGURATION_TABLE)(EFI_GUID *Guid,
+                                                            void *Table);
+typedef EFI_STATUS(EFIAPI *EFI_IMAGE_UNLOAD)(EFI_HANDLE ImageHandle);
+typedef EFI_STATUS(EFIAPI *EFI_IMAGE_START)(EFI_HANDLE ImageHandle,
+                                            size_t *ExitDataSize,
+                                            char16_t **ExitData);
+
+typedef EFI_STATUS(EFIAPI *EFI_EXIT)(EFI_HANDLE ImageHandle,
+                                     EFI_STATUS ExitStatus, size_t ExitDataSize,
+                                     char16_t *ExitData);
+typedef EFI_STATUS(EFIAPI *EFI_EXIT_BOOT_SERVICES)(EFI_HANDLE ImageHandle,
+                                                   size_t MapKey);
+typedef EFI_STATUS(EFIAPI *EFI_GET_NEXT_MONOTONIC_COUNT)(uint64_t *Count);
+typedef EFI_STATUS(EFIAPI *EFI_STALL)(size_t Microseconds);
+typedef EFI_STATUS(EFIAPI *EFI_SET_WATCHDOG_TIMER)(size_t Timeout,
+                                                   uint64_t WatchdogCode,
+                                                   size_t DataSize,
+                                                   char16_t *WatchdogData);
+
+typedef EFI_STATUS(EFIAPI *EFI_CONNECT_CONTROLLER)(
+    EFI_HANDLE ControllerHandle, EFI_HANDLE *DriverImageHandle,
+    EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath, bool Recursive);
+
+typedef EFI_STATUS(EFIAPI *EFI_DISCONNECT_CONTROLLER)(
+    EFI_HANDLE ControllerHandle, EFI_HANDLE DriverImageHandle,
+    EFI_HANDLE ChildHandle);
+
+typedef EFI_STATUS(EFIAPI *EFI_OPEN_PROTOCOL)(
+    EFI_HANDLE Handle, EFI_GUID *Protocol, void **Interface,
+    EFI_HANDLE AgentHandle, EFI_HANDLE ControllerHandle, uint32_t Attributes);
+
+typedef EFI_STATUS(EFIAPI *EFI_CLOSE_PROTOCOL)(EFI_HANDLE Handle,
+                                               EFI_GUID *Protocol,
+                                               EFI_HANDLE AgentHandle,
+                                               EFI_HANDLE ControllerHandle);
+
+typedef EFI_STATUS(EFIAPI *EFI_OPEN_PROTOCOL_INFORMATION)(
+    EFI_HANDLE Handle, EFI_GUID *Protocol,
+    EFI_OPEN_PROTOCOL_INFORMATION_ENTRY **EntryBuffer, size_t *EntryCount);
+
+typedef EFI_STATUS(EFIAPI *EFI_PROTOCOLS_PER_HANDLE)(
+    EFI_HANDLE Handle, EFI_GUID ***ProtocolBuffer, size_t *ProtocolBufferCount);
+
+typedef EFI_STATUS(EFIAPI *EFI_LOCATE_HANDLE_BUFFER)(
+    EFI_LOCATE_SEARCH_TYPE SearchType, EFI_GUID *Protocol, void *SearchKey,
+    size_t *NoHandles, EFI_HANDLE **Buffer);
+
+typedef EFI_STATUS(EFIAPI *EFI_LOCATE_PROTOCOL)(EFI_GUID *Protocol,
+                                                void *Registration,
+                                                void **Interface);
+
+typedef EFI_STATUS(EFIAPI *EFI_UNINSTALL_MULTIPLE_PROTOCOL_INTERFACES)(
+    EFI_HANDLE Handle, ...);
+typedef EFI_STATUS(EFIAPI *EFI_CALCULATE_CRC32)(void *Data, size_t DataSize,
+                                                uint32_t *Crc32);
+
+typedef void(EFIAPI *EFI_COPY_MEM)(void *Destination, void *Source,
+                                   size_t Length);
+typedef void(EFIAPI *EFI_SET_MEM)(void *Buffer, size_t Size, uint8_t Value);
+
+typedef EFI_STATUS(EFIAPI *EFI_CREATE_EVENT_EX)(
+    uint32_t Type, EFI_TPL NotifyTpl, EFI_EVENT_NOTIFY NotifyFunction,
+    const void *NotifyContext, const EFI_GUID *EventGroup, EFI_EVENT *Event);
+
+typedef struct {
+  EFI_TABLE_HEADER Hdr;
+
+  //
+  // Task Priority Services
+  //
+  EFI_RAISE_TPL RaiseTPL;     // EFI 1.0+
+  EFI_RESTORE_TPL RestoreTPL; // EFI 1.0+
+
+  //
+  // Memory Services
+  //
+  EFI_ALLOCATE_PAGES AllocatePages; // EFI 1.0+
+  EFI_FREE_PAGES FreePages;         // EFI 1.0+
+  EFI_GET_MEMORY_MAP GetMemoryMap;  // EFI 1.0+
+  EFI_ALLOCATE_POOL AllocatePool;   // EFI 1.0+
+  EFI_FREE_POOL FreePool;           // EFI 1.0+
+
+  //
+  // Event & Timer Services
+  //
+  EFI_CREATE_EVENT CreateEvent;    // EFI 1.0+
+  EFI_SET_TIMER SetTimer;          // EFI 1.0+
+  EFI_WAIT_FOR_EVENT WaitForEvent; // EFI 1.0+
+  EFI_SIGNAL_EVENT SignalEvent;    // EFI 1.0+
+  EFI_CLOSE_EVENT CloseEvent;      // EFI 1.0+
+  EFI_CHECK_EVENT CheckEvent;      // EFI 1.0+
+
+  //
+  // Protocol Handler Services
+  //
+  EFI_INSTALL_PROTOCOL_INTERFACE InstallProtocolInterface;     // EFI 1.0+
+  EFI_REINSTALL_PROTOCOL_INTERFACE ReinstallProtocolInterface; // EFI 1.0+
+  EFI_UNINSTALL_PROTOCOL_INTERFACE UninstallProtocolInterface; // EFI 1.0+
+  EFI_HANDLE_PROTOCOL HandleProtocol;                          // EFI 1.0+
+  void *Reserved;                                              // EFI 1.0+
+  EFI_REGISTER_PROTOCOL_NOTIFY RegisterProtocolNotify;         // EFI 1.0+
+  EFI_LOCATE_HANDLE LocateHandle;                              // EFI 1.+
+  EFI_LOCATE_DEVICE_PATH LocateDevicePath;                     // EFI 1.0+
+  EFI_INSTALL_CONFIGURATION_TABLE InstallConfigurationTable;   // EFI 1.0+
+
+  //
+  // Image Services
+  //
+  EFI_IMAGE_UNLOAD LoadImage;              // EFI 1.0+
+  EFI_IMAGE_START StartImage;              // EFI 1.0+
+  EFI_EXIT Exit;                           // EFI 1.0+
+  EFI_IMAGE_UNLOAD UnloadImage;            // EFI 1.0+
+  EFI_EXIT_BOOT_SERVICES ExitBootServices; // EFI 1.0+
+
+  //
+  // Miscellaneous Services
+  //
+  EFI_GET_NEXT_MONOTONIC_COUNT GetNextMonotonicCount; // EFI 1.0+
+  EFI_STALL Stall;                                    // EFI 1.0+
+  EFI_SET_WATCHDOG_TIMER SetWatchdogTimer;            // EFI 1.0+
+
+  //
+  // DriverSupport Services
+  //
+  EFI_CONNECT_CONTROLLER ConnectController;       // EFI 1.1
+  EFI_DISCONNECT_CONTROLLER DisconnectController; // EFI 1.1+
+
+  //
+  // Open and Close Protocol Services
+  //
+  EFI_OPEN_PROTOCOL OpenProtocol;                        // EFI 1.1+
+  EFI_CLOSE_PROTOCOL CloseProtocol;                      // EFI 1.1+
+  EFI_OPEN_PROTOCOL_INFORMATION OpenProtocolInformation; // EFI 1.1+
+
+  //
+  // Library Services
+  //
+  EFI_PROTOCOLS_PER_HANDLE ProtocolsPerHandle; // EFI 1.1+
+  EFI_LOCATE_HANDLE_BUFFER LocateHandleBuffer; // EFI 1.1+
+  EFI_LOCATE_PROTOCOL LocateProtocol;          // EFI 1.1+
+  EFI_UNINSTALL_MULTIPLE_PROTOCOL_INTERFACES
+  InstallMultipleProtocolInterfaces; // EFI 1.1+
+  EFI_UNINSTALL_MULTIPLE_PROTOCOL_INTERFACES
+  UninstallMultipleProtocolInterfaces; // EFI 1.1+*
+
+  //
+  // 32-bit CRC Services
+  //
+  EFI_CALCULATE_CRC32 CalculateCrc32; // EFI 1.1+
+
+  //
+  // Miscellaneous Services
+  //
+  EFI_COPY_MEM CopyMem;              // EFI 1.1+
+  EFI_SET_MEM SetMem;                // EFI 1.1+
+  EFI_CREATE_EVENT_EX CreateEventEx; // UEFI 2.0+
+} EFI_BOOT_SERVICES;
+
+#endif // LLVM_LIBC_TYPES_EFI_BOOT_SERVICES_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_CAPSULE.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_CAPSULE.h
new file mode 100644
index 000000000000..c7440c9b03b7
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_CAPSULE.h
@@ -0,0 +1,26 @@
+//===-- Definition of EFI_CAPSULE type ------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_CAPSULE_H
+#define LLVM_LIBC_TYPES_EFI_CAPSULE_H
+
+#include "../llvm-libc-macros/stdint-macros.h"
+#include "EFI_GUID.h"
+
+typedef struct {
+  EFI_GUID CapsuleGuid;
+  uint32_t HeaderSize;
+  uint32_t Flags;
+  uint32_t CapsuleImageSize;
+} EFI_CAPSULE_HEADER;
+
+#define CAPSULE_FLAGS_PERSIST_ACROSS_RESET 0x00010000
+#define CAPSULE_FLAGS_POPULATE_SYSTEM_TABLE 0x00020000
+#define CAPSULE_FLAGS_INITIATE_RESET 0x00040000
+
+#endif // LLVM_LIBC_TYPES_EFI_CAPSULE_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_CONFIGURATION_TABLE.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_CONFIGURATION_TABLE.h
new file mode 100644
index 000000000000..56cd3e4fbb58
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_CONFIGURATION_TABLE.h
@@ -0,0 +1,19 @@
+//===-- Definition of EFI_CONFIGURATION_TABLE type ------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_CONFIGURATION_TABLE_H
+#define LLVM_LIBC_TYPES_EFI_CONFIGURATION_TABLE_H
+
+#include "EFI_GUID.h"
+
+typedef struct {
+  EFI_GUID VendorGuid;
+  void *VendorTable;
+} EFI_CONFIGURATION_TABLE;
+
+#endif // LLVM_LIBC_TYPES_EFI_CONFIGURATION_TABLE_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_DEVICE_PATH_PROTOCOL.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_DEVICE_PATH_PROTOCOL.h
new file mode 100644
index 000000000000..f6a0b2e1f45c
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_DEVICE_PATH_PROTOCOL.h
@@ -0,0 +1,23 @@
+//===-- Definition of EFI_DEVICE_PATH_PROTOCOL type -----------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_DEVICE_PATH_PROTOCOL_H
+#define LLVM_LIBC_TYPES_EFI_DEVICE_PATH_PROTOCOL_H
+
+#include "../llvm-libc-macros/stdint-macros.h"
+
+#define EFI_DEVICE_PATH_PROTOCOL_GUID                                          \
+  {0x09576e91, 0x6d3f, 0x11d2, {0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b}}
+
+typedef struct _EFI_DEVICE_PATH_PROTOCOL {
+  uint8_t Type;
+  uint8_t SubType;
+  uint8_t Length[2];
+} EFI_DEVICE_PATH_PROTOCOL;
+
+#endif // LLVM_LIBC_TYPES_EFI_DEVICE_PATH_PROTOCOL_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_EVENT.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_EVENT.h
new file mode 100644
index 000000000000..938856b8e791
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_EVENT.h
@@ -0,0 +1,21 @@
+//===-- Definition of EFI_EVENT type --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_EVENT_H
+#define LLVM_LIBC_TYPES_EFI_EVENT_H
+
+typedef void *EFI_EVENT;
+
+#define EVT_TIMER 0x80000000
+#define EVT_RUNTIME 0x40000000
+#define EVT_NOTIFY_WAIT 0x00000100
+#define EVT_NOTIFY_SIGNAL 0x00000200
+#define EVT_SIGNAL_EXIT_BOOT_SERVICES 0x00000201
+#define EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE 0x60000202
+
+#endif // LLVM_LIBC_TYPES_EFI_EVENT_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_GUID.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_GUID.h
new file mode 100644
index 000000000000..b3530008384d
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_GUID.h
@@ -0,0 +1,21 @@
+//===-- Definition of EFI_GUID type -----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_GUID_H
+#define LLVM_LIBC_TYPES_EFI_GUID_H
+
+#include "../llvm-libc-macros/stdint-macros.h"
+
+typedef struct {
+  uint32_t Data1;
+  uint16_t Data2;
+  uint16_t Data3;
+  uint8_t Data4[8];
+} EFI_GUID;
+
+#endif // LLVM_LIBC_TYPES_EFI_GUID_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_HANDLE.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_HANDLE.h
new file mode 100644
index 000000000000..d4376dd24753
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_HANDLE.h
@@ -0,0 +1,14 @@
+//===-- Definition of EFI_HANDLE type ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_HANDLE_H
+#define LLVM_LIBC_TYPES_EFI_HANDLE_H
+
+typedef void *EFI_HANDLE;
+
+#endif // LLVM_LIBC_TYPES_EFI_HANDLE_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_INTERFACE_TYPE.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_INTERFACE_TYPE.h
new file mode 100644
index 000000000000..d463c5381b3f
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_INTERFACE_TYPE.h
@@ -0,0 +1,16 @@
+//===-- Definition of EFI_INTERFACE_TYPE type -----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_INTERFACE_TYPE_H
+#define LLVM_LIBC_TYPES_EFI_INTERFACE_TYPE_H
+
+typedef enum {
+  EFI_NATIVE_INTERFACE,
+} EFI_INTERFACE_TYPE;
+
+#endif // LLVM_LIBC_TYPES_EFI_INTERFACE_TYPE_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_LOCATE_SEARCH_TYPE.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_LOCATE_SEARCH_TYPE.h
new file mode 100644
index 000000000000..3a8fd7bc3e77
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_LOCATE_SEARCH_TYPE.h
@@ -0,0 +1,18 @@
+//===-- Definition of EFI_LOCATE_SEARCH_TYPE type -------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_LOCATE_SEARCH_TYPE_H
+#define LLVM_LIBC_TYPES_EFI_LOCATE_SEARCH_TYPE_H
+
+typedef enum {
+  AllHandles,
+  ByRegisterNotify,
+  ByProtocol,
+} EFI_LOCATE_SEARCH_TYPE;
+
+#endif // LLVM_LIBC_TYPES_EFI_LOCATE_SEARCH_TYPE_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_MEMORY_DESCRIPTOR.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_MEMORY_DESCRIPTOR.h
new file mode 100644
index 000000000000..72d0579aef76
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_MEMORY_DESCRIPTOR.h
@@ -0,0 +1,43 @@
+//===-- Definition of EFI_MEMORY_DESCRIPTOR type --------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_MEMORY_DESCRIPTOR_H
+#define LLVM_LIBC_TYPES_EFI_MEMORY_DESCRIPTOR_H
+
+#include "../llvm-libc-macros/stdint-macros.h"
+#include "EFI_PHYSICAL_ADDRESS.h"
+#include "EFI_VIRTUAL_ADDRESS.h"
+
+#define EFI_MEMORY_DESCRIPTOR_VERSION 1
+
+#define EFI_MEMORY_UC 0x0000000000000001
+#define EFI_MEMORY_WC 0x0000000000000002
+#define EFI_MEMORY_WT 0x0000000000000004
+#define EFI_MEMORY_WB 0x0000000000000008
+#define EFI_MEMORY_UCE 0x0000000000000010
+#define EFI_MEMORY_WP 0x0000000000001000
+#define EFI_MEMORY_RP 0x0000000000002000
+#define EFI_MEMORY_XP 0x0000000000004000
+#define EFI_MEMORY_NV 0x0000000000008000
+#define EFI_MEMORY_MORE_RELIABLE 0x0000000000010000
+#define EFI_MEMORY_RO 0x0000000000020000
+#define EFI_MEMORY_SP 0x0000000000040000
+#define EFI_MEMORY_CPU_CRYPTO 0x0000000000080000
+#define EFI_MEMORY_RUNTIME 0x8000000000000000
+#define EFI_MEMORY_ISA_VALID 0x4000000000000000
+#define EFI_MEMORY_ISA_MASK 0x0FFFF00000000000
+
+typedef struct {
+  uint32_t Type;
+  EFI_PHYSICAL_ADDRESS PhysicalStart;
+  EFI_VIRTUAL_ADDRESS VirtualStart;
+  uint64_t NumberOfPages;
+  uint64_t Attribute;
+} EFI_MEMORY_DESCRIPTOR;
+
+#endif // LLVM_LIBC_TYPES_EFI_MEMORY_DESCRIPTOR_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_MEMORY_TYPE.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_MEMORY_TYPE.h
new file mode 100644
index 000000000000..c8921cda2c38
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_MEMORY_TYPE.h
@@ -0,0 +1,32 @@
+//===-- Definition of EFI_MEMORY_TYPE type --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_MEMORY_TYPE_H
+#define LLVM_LIBC_TYPES_EFI_MEMORY_TYPE_H
+
+typedef enum {
+  EfiReservedMemoryType,
+  EfiLoaderCode,
+  EfiLoaderData,
+  EfiBootServicesCode,
+  EfiBootServicesData,
+  EfiRuntimeServicesCode,
+  EfiRuntimeServicesData,
+  EfiConventionalMemory,
+  EfiUnusableMemory,
+  EfiACPIReclaimMemory,
+  EfiACPIMemoryNVS,
+  EfiMemoryMappedIO,
+  EfiMemoryMappedIOPortSpace,
+  EfiPalCode,
+  EfiPersistentMemory,
+  EfiUnacceptedMemoryType,
+  EfiMaxMemoryType
+} EFI_MEMORY_TYPE;
+
+#endif // LLVM_LIBC_TYPES_EFI_MEMORY_TYPE_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_OPEN_PROTOCOL_INFORMATION_ENTRY.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_OPEN_PROTOCOL_INFORMATION_ENTRY.h
new file mode 100644
index 000000000000..de0c59c139ef
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_OPEN_PROTOCOL_INFORMATION_ENTRY.h
@@ -0,0 +1,22 @@
+//===-- Definition of EFI_OPEN_PROTOCOL_INFORMATION_ENTRY type ------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_OPEN_PROTOCOL_INFORMATION_ENTRY_H
+#define LLVM_LIBC_TYPES_EFI_OPEN_PROTOCOL_INFORMATION_ENTRY_H
+
+#include "../llvm-libc-macros/stdint-macros.h"
+#include "EFI_HANDLE.h"
+
+typedef struct {
+  EFI_HANDLE AgentHandle;
+  EFI_HANDLE ControllerHandle;
+  uint32_t Attributes;
+  uint32_t OpenCount;
+} EFI_OPEN_PROTOCOL_INFORMATION_ENTRY;
+
+#endif // LLVM_LIBC_TYPES_EFI_OPEN_PROTOCOL_INFORMATION_ENTRY_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_PHYSICAL_ADDRESS.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_PHYSICAL_ADDRESS.h
new file mode 100644
index 000000000000..8880ee66c0f8
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_PHYSICAL_ADDRESS.h
@@ -0,0 +1,16 @@
+//===-- Definition of EFI_PHYSICAL_ADDRESS type ---------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_PHYSICAL_ADDRESS_H
+#define LLVM_LIBC_TYPES_EFI_PHYSICAL_ADDRESS_H
+
+#include "../llvm-libc-macros/stdint-macros.h"
+
+typedef uint64_t EFI_PHYSICAL_ADDRESS;
+
+#endif // LLVM_LIBC_TYPES_EFI_PHYSICAL_ADDRESS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_RUNTIME_SERVICES.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_RUNTIME_SERVICES.h
new file mode 100644
index 000000000000..8913118b0844
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_RUNTIME_SERVICES.h
@@ -0,0 +1,137 @@
+//===-- Definition of EFI_RUNTIME_SERVICES type ---------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_RUNTIME_SERVICES_H
+#define LLVM_LIBC_TYPES_EFI_RUNTIME_SERVICES_H
+
+#include "../llvm-libc-macros/EFIAPI-macros.h"
+#include "../llvm-libc-macros/stdint-macros.h"
+#include "EFI_CAPSULE.h"
+#include "EFI_MEMORY_DESCRIPTOR.h"
+#include "EFI_PHYSICAL_ADDRESS.h"
+#include "EFI_STATUS.h"
+#include "EFI_TABLE_HEADER.h"
+#include "EFI_TIME.h"
+#include "char16_t.h"
+#include "size_t.h"
+
+#define EFI_RUNTIME_SERVICES_SIGNATURE 0x56524553544e5552
+#define EFI_RUNTIME_SERVICES_REVISION EFI_SPECIFICATION_VERSION
+
+#define EFI_VARIABLE_NON_VOLATILE 0x00000001
+#define EFI_VARIABLE_BOOTSERVICE_ACCESS 0x00000002
+#define EFI_VARIABLE_RUNTIME_ACCESS 0x00000004
+#define EFI_VARIABLE_HARDWARE_ERROR_RECORD 0x00000008
+// This attribute is identified by the mnemonic 'HR' elsewhere
+// in this specification.
+#define EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS 0x00000010
+// NOTE: EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS is deprecated
+// and should be considered reserved.
+#define EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS 0x00000020
+#define EFI_VARIABLE_APPEND_WRITE 0x00000040
+#define EFI_VARIABLE_ENHANCED_AUTHENTICATED_ACCESS 0x00000080
+
+typedef enum {
+  EfiResetCold,
+  EfiResetWarm,
+  EfiResetShutdown,
+  EfiResetPlatformSpecific,
+} EFI_RESET_TYPE;
+
+#define EFI_VARIABLE_AUTHENTICATION_3_CERT_ID_SHA256 1
+
+typedef struct {
+  uint8_t Type;
+  uint32_t IdSize;
+  // Value is defined as:
+  // uint8_t Id[IdSize];
+} EFI_VARIABLE_AUTHENTICATION_3_CERT_ID;
+
+typedef EFI_STATUS(EFIAPI *EFI_GET_TIME)(EFI_TIME *Time,
+                                         EFI_TIME_CAPABILITIES *Capabilities);
+typedef EFI_STATUS(EFIAPI *EFI_SET_TIME)(EFI_TIME *Time);
+typedef EFI_STATUS(EFIAPI *EFI_GET_WAKEUP_TIME)(bool *Enabled, bool *Pending,
+                                                EFI_TIME *Time);
+typedef EFI_STATUS(EFIAPI *EFI_SET_WAKEUP_TIME)(bool *Enabled, EFI_TIME *Time);
+
+typedef EFI_STATUS(EFIAPI *EFI_SET_VIRTUAL_ADDRESS_MAP)(
+    size_t MemoryMapSize, size_t DescriptorSize, uint32_t DescriptorVersion,
+    EFI_MEMORY_DESCRIPTOR *VirtualMap);
+typedef EFI_STATUS(EFIAPI *EFI_CONVERT_POINTER)(size_t DebugDisposition,
+                                                void **Address);
+
+typedef EFI_STATUS(EFIAPI *EFI_GET_VARIABLE)(char16_t *VariableName,
+                                             EFI_GUID *VendorGuid,
+                                             uint32_t *Attributes,
+                                             size_t *DataSize, void *Data);
+typedef EFI_STATUS(EFIAPI *EFI_GET_NEXT_VARIABLE_NAME)(size_t *VariableNameSize,
+                                                       char16_t *VariableName,
+                                                       EFI_GUID *VendorGuid);
+typedef EFI_STATUS(EFIAPI *EFI_SET_VARIABLE)(char16_t *VariableName,
+                                             EFI_GUID *VendorGuid,
+                                             uint32_t Attributes,
+                                             size_t DataSize, void *Data);
+
+typedef EFI_STATUS(EFIAPI *EFI_GET_NEXT_HIGH_MONO_COUNT)(uint32_t *HighCount);
+typedef void(EFIAPI *EFI_RESET_SYSTEM)(EFI_RESET_TYPE ResetType,
+                                       EFI_STATUS ResetStatus, size_t DataSize,
+                                       void *ResetData);
+
+typedef EFI_STATUS(EFIAPI *EFI_UPDATE_CAPSULE)(
+    EFI_CAPSULE_HEADER **CapsuleHeaderArray, size_t CapsuleCount,
+    EFI_PHYSICAL_ADDRESS ScatterGatherList);
+typedef EFI_STATUS(EFIAPI *EFI_QUERY_CAPSULE_CAPABILITIES)(
+    EFI_CAPSULE_HEADER **CapsuleHeaderArray, size_t CapsuleCount,
+    uint64_t *MaximumCapsuleSize, EFI_RESET_TYPE ResetType);
+
+typedef EFI_STATUS(EFIAPI *EFI_QUERY_VARIABLE_INFO)(
+    uint32_t Attributes, uint64_t *MaximumVariableStorageSize,
+    uint64_t *RemainingVariableStorageSize, uint64_t *MaximumVariableSize);
+
+typedef struct {
+  EFI_TABLE_HEADER Hdr;
+
+  ///
+  /// Time Services
+  EFI_GET_TIME GetTime;
+  EFI_SET_TIME SetTime;
+  EFI_GET_WAKEUP_TIME GetWakeupTime;
+  EFI_SET_WAKEUP_TIME SetWakeupTime;
+
+  //
+  // Virtual Memory Services
+  //
+  EFI_SET_VIRTUAL_ADDRESS_MAP SetVirtualAddressMap;
+  EFI_CONVERT_POINTER ConvertPointer;
+
+  //
+  // Variable Services
+  //
+  EFI_GET_VARIABLE GetVariable;
+  EFI_GET_NEXT_VARIABLE_NAME GetNextVariableName;
+  EFI_SET_VARIABLE SetVariable;
+
+  //
+  // Miscellaneous Services
+  //
+  EFI_GET_NEXT_HIGH_MONO_COUNT GetNextHighMonotonicCount;
+  EFI_RESET_SYSTEM ResetSystem;
+
+  //
+  // UEFI 2.0 Capsule Services
+  //
+  EFI_UPDATE_CAPSULE UpdateCapsule;
+  EFI_QUERY_CAPSULE_CAPABILITIES QueryCapsuleCapabilities;
+
+  //
+  // Miscellaneous UEFI 2.0 Service
+  //
+  EFI_QUERY_VARIABLE_INFO QueryVariableInfo;
+} EFI_RUNTIME_SERVICES;
+
+#endif // LLVM_LIBC_TYPES_EFI_RUNTIME_SERVICES_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_SIMPLE_TEXT_INPUT_PROTOCOL.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_SIMPLE_TEXT_INPUT_PROTOCOL.h
new file mode 100644
index 000000000000..a6dc0952b631
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_SIMPLE_TEXT_INPUT_PROTOCOL.h
@@ -0,0 +1,39 @@
+//===-- Definition of EFI_SIMPLE_TEXT_INPUT_PROTOCOL type -----------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_SIMPLE_TEXT_INPUT_PROTOCOL_H
+#define LLVM_LIBC_TYPES_EFI_SIMPLE_TEXT_INPUT_PROTOCOL_H
+
+#include "../llvm-libc-macros/EFIAPI-macros.h"
+#include "../llvm-libc-macros/stdint-macros.h"
+#include "EFI_EVENT.h"
+#include "EFI_STATUS.h"
+#include "char16_t.h"
+
+#define EFI_SIMPLE_TEXT_INPUT_PROTOCOL_GUID                                    \
+  {0x387477c1, 0x69c7, 0x11d2, {0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b}}
+
+typedef struct {
+  uint16_t ScanCode;
+  char16_t UnicodeChar;
+} EFI_INPUT_KEY;
+
+struct _EFI_SIMPLE_TEXT_INPUT_PROTOCOL;
+
+typedef EFI_STATUS(EFIAPI *EFI_INPUT_RESET)(
+    struct _EFI_SIMPLE_TEXT_INPUT_PROTOCOL *This, bool ExtendedVerification);
+typedef EFI_STATUS(EFIAPI *EFI_INPUT_READ_KEY)(
+    struct _EFI_SIMPLE_TEXT_INPUT_PROTOCOL *This, EFI_INPUT_KEY *Key);
+
+typedef struct _EFI_SIMPLE_TEXT_INPUT_PROTOCOL {
+  EFI_INPUT_RESET Reset;
+  EFI_INPUT_READ_KEY ReadKeyStroke;
+  EFI_EVENT WaitForKey;
+} EFI_SIMPLE_TEXT_INPUT_PROTOCOL;
+
+#endif // LLVM_LIBC_TYPES_EFI_SIMPLE_TEXT_INPUT_PROTOCOL_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.h
new file mode 100644
index 000000000000..b5014c46a072
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.h
@@ -0,0 +1,64 @@
+//===-- Definition of EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL type ----------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL_H
+#define LLVM_LIBC_TYPES_EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL_H
+
+#include "../llvm-libc-macros/stdint-macros.h"
+#include "EFI_STATUS.h"
+#include "size_t.h"
+
+#define EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL_GUID                                   \
+  {0x387477c2, 0x69c7, 0x11d2, {0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b}}
+
+struct _EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL;
+
+typedef EFI_STATUS(EFIAPI *EFI_TEXT_RESET)(
+    struct _EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This, bool ExtendedVerification);
+typedef EFI_STATUS(EFIAPI *EFI_TEXT_STRING)(
+    struct _EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This, const char16_t *String);
+typedef EFI_STATUS(EFIAPI *EFI_TEXT_TEST_STRING)(
+    struct _EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This, const char16_t *String);
+typedef EFI_STATUS(EFIAPI *EFI_TEXT_QUERY_MODE)(
+    struct _EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This, size_t ModeNumber,
+    size_t *Columns, size_t *Rows);
+
+typedef EFI_STATUS(EFIAPI *EFI_TEXT_SET_MODE)(
+    struct _EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This, size_t ModeNumber);
+typedef EFI_STATUS(EFIAPI *EFI_TEXT_SET_ATTRIBUTE)(
+    struct _EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This, size_t Attribute);
+typedef EFI_STATUS(EFIAPI *EFI_TEXT_CLEAR_SCREEN)(
+    struct _EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This);
+typedef EFI_STATUS(EFIAPI *EFI_TEXT_SET_CURSOR_POSITION)(
+    struct _EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This, size_t Column, size_t Row);
+typedef EFI_STATUS(EFIAPI *EFI_TEXT_ENABLE_CURSOR)(
+    struct _EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This, bool Visible);
+
+typedef struct {
+  int32_t MaxMode;
+  int32_t Mode;
+  int32_t Attribute;
+  int32_t CursorColumn;
+  int32_t CursorRow;
+  bool CursorVisible;
+} SIMPLE_TEXT_OUTPUT_MODE;
+
+typedef struct _EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL {
+  EFI_TEXT_RESET Reset;
+  EFI_TEXT_STRING OutputString;
+  EFI_TEXT_TEST_STRING TestString;
+  EFI_TEXT_QUERY_MODE QueryMode;
+  EFI_TEXT_SET_MODE SetMode;
+  EFI_TEXT_SET_ATTRIBUTE SetAttribute;
+  EFI_TEXT_CLEAR_SCREEN ClearScreen;
+  EFI_TEXT_SET_CURSOR_POSITION SetCursorPosition;
+  EFI_TEXT_ENABLE_CURSOR EnableCursor;
+  SIMPLE_TEXT_OUTPUT_MODE *Mode;
+} EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL;
+
+#endif // LLVM_LIBC_TYPES_EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_STATUS.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_STATUS.h
new file mode 100644
index 000000000000..bb9542bed8ef
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_STATUS.h
@@ -0,0 +1,60 @@
+//===-- Definition of EFI_STATUS type ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_STATUS_H
+#define LLVM_LIBC_TYPES_EFI_STATUS_H
+
+#include "../llvm-libc-macros/stdint-macros.h"
+
+typedef uintptr_t EFI_STATUS;
+
+#define EFI_SUCCESS 0
+
+#define EFI_LOAD_ERROR 1
+#define EFI_INVALID_PARAMETER 2
+#define EFI_UNSUPPORTED 3
+#define EFI_BAD_BUFFER_SIZE 4
+#define EFI_BUFFER_TOO_SMALL 5
+#define EFI_NOT_READY 6
+#define EFI_DEVICE_ERROR 7
+#define EFI_WRITE_PROTECTED 8
+#define EFI_OUT_OF_RESOURCES 9
+#define EFI_VOLUME_CORRUPTED 10
+#define EFI_VOLUME_FULL 11
+#define EFI_NO_MEDIA 12
+#define EFI_MEDIA_CHANGED 13
+#define EFI_NOT_FOUND 14
+#define EFI_ACCESS_DENIED 15
+#define EFI_NO_RESPONSE 16
+#define EFI_NO_MAPPING 17
+#define EFI_TIMEOUT 18
+#define EFI_NOT_STARTED 19
+#define EFI_ALREADY_STARTED 20
+#define EFI_ABORTED 21
+#define EFI_ICMP_ERROR 22
+#define EFI_TFTP_ERROR 23
+#define EFI_PROTOCOL_ERROR 24
+#define EFI_INCOMPATIBLE_VERSION 25
+#define EFI_SECURITY_VIOLATION 26
+#define EFI_CRC_ERROR 27
+#define EFI_END_OF_MEDIA 28
+#define EFI_END_OF_FILE 31
+#define EFI_INVALID_LANGUAGE 32
+#define EFI_COMPROMISED_DATA 33
+#define EFI_IP_ADDRESS_CONFLICT 34
+#define EFI_HTTP_ERROR 35
+
+#define EFI_WARN_UNKNOWN_GLYPH 1
+#define EFI_WARN_DELETE_FAILURE 2
+#define EFI_WARN_WRITE_FAILURE 3
+#define EFI_WARN_BUFFER_TOO_SMALL 4
+#define EFI_WARN_STALE_DATA 5
+#define EFI_WARN_FILE_SYSTEM 6
+#define EFI_WARN_RESET_REQUIRED 7
+
+#endif // LLVM_LIBC_TYPES_EFI_STATUS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_SYSTEM_TABLE.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_SYSTEM_TABLE.h
new file mode 100644
index 000000000000..290067ad862e
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_SYSTEM_TABLE.h
@@ -0,0 +1,65 @@
+//===-- Definition of EFI_SYSTEM_TABLE type -------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_SYSTEM_TABLE_H
+#define LLVM_LIBC_TYPES_EFI_SYSTEM_TABLE_H
+
+#include "../llvm-libc-macros/stdint-macros.h"
+#include "EFI_BOOT_SERVICES.h"
+#include "EFI_CONFIGURATION_TABLE.h"
+#include "EFI_HANDLE.h"
+#include "EFI_RUNTIME_SERVICES.h"
+#include "EFI_SIMPLE_TEXT_INPUT_PROTOCOL.h"
+#include "EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.h"
+#include "EFI_STATUS.h"
+#include "EFI_TABLE_HEADER.h"
+
+#include "char16_t.h"
+#include "size_t.h"
+
+#define EFI_SYSTEM_TABLE_SIGNATURE 0x5453595320494249
+#define EFI_2_100_SYSTEM_TABLE_REVISION ((2 << 16) | (100))
+#define EFI_2_90_SYSTEM_TABLE_REVISION ((2 << 16) | (90))
+#define EFI_2_80_SYSTEM_TABLE_REVISION ((2 << 16) | (80))
+#define EFI_2_70_SYSTEM_TABLE_REVISION ((2 << 16) | (70))
+#define EFI_2_60_SYSTEM_TABLE_REVISION ((2 << 16) | (60))
+#define EFI_2_50_SYSTEM_TABLE_REVISION ((2 << 16) | (50))
+#define EFI_2_40_SYSTEM_TABLE_REVISION ((2 << 16) | (40))
+#define EFI_2_31_SYSTEM_TABLE_REVISION ((2 << 16) | (31))
+#define EFI_2_30_SYSTEM_TABLE_REVISION ((2 << 16) | (30))
+#define EFI_2_20_SYSTEM_TABLE_REVISION ((2 << 16) | (20))
+#define EFI_2_10_SYSTEM_TABLE_REVISION ((2 << 16) | (10))
+#define EFI_2_00_SYSTEM_TABLE_REVISION ((2 << 16) | (00))
+#define EFI_1_10_SYSTEM_TABLE_REVISION ((1 << 16) | (10))
+#define EFI_1_02_SYSTEM_TABLE_REVISION ((1 << 16) | (02))
+#define EFI_SPECIFICATION_VERSION EFI_SYSTEM_TABLE_REVISION
+#define EFI_SYSTEM_TABLE_REVISION EFI_2_100_SYSTEM_TABLE_REVISION
+
+typedef struct {
+  EFI_TABLE_HEADER Hdr;
+
+  char16_t *FirmwareVendor;
+  uint32_t FirmwareRevision;
+
+  EFI_HANDLE ConsoleInHandle;
+  EFI_SIMPLE_TEXT_INPUT_PROTOCOL *ConIn;
+
+  EFI_HANDLE ConsoleOutHandle;
+  EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *ConOut;
+
+  EFI_HANDLE StandardErrorHandle;
+  EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *StdErr;
+
+  EFI_RUNTIME_SERVICES *RuntimeServices;
+  EFI_BOOT_SERVICES *BootServices;
+
+  size_t NumberOfTableEntries;
+  EFI_CONFIGURATION_TABLE *ConfigurationTable;
+} EFI_SYSTEM_TABLE;
+
+#endif // LLVM_LIBC_TYPES_EFI_SYSTEM_TABLE_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_TABLE_HEADER.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_TABLE_HEADER.h
new file mode 100644
index 000000000000..293968ecc4d1
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_TABLE_HEADER.h
@@ -0,0 +1,22 @@
+//===-- Definition of EFI_TABLE_HEADER type -------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_TABLE_HEADER_H
+#define LLVM_LIBC_TYPES_EFI_TABLE_HEADER_H
+
+#include "../llvm-libc-macros/stdint-macros.h"
+
+typedef struct {
+  uint64_t Signature;
+  uint32_t Revision;
+  uint32_t HeaderSize;
+  uint32_t CRC32;
+  uint32_t Reserved;
+} EFI_TABLE_HEADER;
+
+#endif // LLVM_LIBC_TYPES_EFI_TABLE_HEADER_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_TIME.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_TIME.h
new file mode 100644
index 000000000000..b0e38b987d44
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_TIME.h
@@ -0,0 +1,37 @@
+//===-- Definition of EFI_TIME type ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_TIME_H
+#define LLVM_LIBC_TYPES_EFI_TIME_H
+
+#include "../llvm-libc-macros/stdint-macros.h"
+
+typedef struct {
+  uint16_t Year;  // 1900 - 9999
+  uint8_t Month;  // 1 - 12
+  uint8_t Day;    // 1 - 31
+  uint8_t Hour;   // 0 - 23
+  uint8_t Minute; // 0 - 59
+  uint8_t Second; // 0 - 59
+  uint8_t Pad1;
+  uint32_t Nanosecond; // 0 - 999,999,999
+  int16_t TimeZone;    // --1440 to 1440 or 2047
+} EFI_TIME;
+
+#define EFI_TIME_ADJUST_DAYLIGHT 0x01
+#define EFI_TIME_IN_DAYLIGHT 0x02
+
+#define EFI_UNSPECIFIED_TIMEZONE 0x07FF
+
+typedef struct {
+  uint32_t Resolution;
+  uint32_t Accuracy;
+  bool SetsToZero;
+} EFI_TIME_CAPABILITIES;
+
+#endif // LLVM_LIBC_TYPES_EFI_TIME_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_TIMER_DELAY.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_TIMER_DELAY.h
new file mode 100644
index 000000000000..2a6872c69c8b
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_TIMER_DELAY.h
@@ -0,0 +1,18 @@
+//===-- Definition of EFI_TIMER_DELAY type --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_TIMER_DELAY_H
+#define LLVM_LIBC_TYPES_EFI_TIMER_DELAY_H
+
+typedef enum {
+  TimerCancel,
+  TimerPeriodic,
+  TimerRelative,
+} EFI_TIMER_DELAY;
+
+#endif // LLVM_LIBC_TYPES_EFI_TIMER_DELAY_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_TPL.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_TPL.h
new file mode 100644
index 000000000000..8361ccfacd6f
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_TPL.h
@@ -0,0 +1,21 @@
+//===-- Definition of EFI_TPL type ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_TPL_H
+#define LLVM_LIBC_TYPES_EFI_TPL_H
+
+#include "size_t.h"
+
+typedef size_t EFI_TPL;
+
+#define TPL_APPLICATION 4
+#define TPL_CALLBACK 8
+#define TPL_NOTIFY 16
+#define TPL_HIGH_LEVEL 31
+
+#endif // LLVM_LIBC_TYPES_EFI_TPL_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/EFI_VIRTUAL_ADDRESS.h b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_VIRTUAL_ADDRESS.h
new file mode 100644
index 000000000000..46cbec734dad
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/EFI_VIRTUAL_ADDRESS.h
@@ -0,0 +1,16 @@
+//===-- Definition of EFI_VIRTUAL_ADDRESS type ----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_EFI_VIRTUAL_ADDRESS_H
+#define LLVM_LIBC_TYPES_EFI_VIRTUAL_ADDRESS_H
+
+#include "../llvm-libc-macros/stdint-macros.h"
+
+typedef uint64_t EFI_VIRTUAL_ADDRESS;
+
+#endif // LLVM_LIBC_TYPES_EFI_VIRTUAL_ADDRESS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/ENTRY.h b/contrib/llvm-project/libc/include/llvm-libc-types/ENTRY.h
new file mode 100644
index 000000000000..b007c8edba2f
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/ENTRY.h
@@ -0,0 +1,17 @@
+//===-- Definition of ENTRY type ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_ENTRY_H
+#define LLVM_LIBC_TYPES_ENTRY_H
+
+typedef struct entry {
+  char *key;
+  void *data;
+} ENTRY;
+
+#endif // LLVM_LIBC_TYPES_ENTRY_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/FILE.h b/contrib/llvm-project/libc/include/llvm-libc-types/FILE.h
new file mode 100644
index 000000000000..f1d2e4f726c7
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/FILE.h
@@ -0,0 +1,14 @@
+//===-- Definition of the type FILE ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_FILE_H
+#define LLVM_LIBC_TYPES_FILE_H
+
+typedef struct FILE FILE;
+
+#endif // LLVM_LIBC_TYPES_FILE_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/VISIT.h b/contrib/llvm-project/libc/include/llvm-libc-types/VISIT.h
new file mode 100644
index 000000000000..0a7ff6e50d46
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/VISIT.h
@@ -0,0 +1,14 @@
+//===-- Definition of VISIT type ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_VISIT_H
+#define LLVM_LIBC_TYPES_VISIT_H
+
+typedef enum { preorder, postorder, endorder, leaf } VISIT;
+
+#endif // LLVM_LIBC_TYPES_VISIT_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/__atexithandler_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/__atexithandler_t.h
new file mode 100644
index 000000000000..01aed676c2a7
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/__atexithandler_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of type __atexithandler_t ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES___ATEXITHANDLER_T_H
+#define LLVM_LIBC_TYPES___ATEXITHANDLER_T_H
+
+typedef void (*__atexithandler_t)(void);
+
+#endif // LLVM_LIBC_TYPES___ATEXITHANDLER_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/__atfork_callback_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/__atfork_callback_t.h
new file mode 100644
index 000000000000..ae2d0ca39d53
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/__atfork_callback_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of type __atfork_callback_t ----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES___ATFORK_CALLBACK_T_H
+#define LLVM_LIBC_TYPES___ATFORK_CALLBACK_T_H
+
+typedef void (*__atfork_callback_t)(void);
+
+#endif // LLVM_LIBC_TYPES___ATFORK_CALLBACK_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/__call_once_func_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/__call_once_func_t.h
new file mode 100644
index 000000000000..6d278da4f1d3
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/__call_once_func_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of __call_once_func_t type -----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES___CALL_ONCE_FUNC_T_H
+#define LLVM_LIBC_TYPES___CALL_ONCE_FUNC_T_H
+
+typedef void (*__call_once_func_t)(void);
+
+#endif // LLVM_LIBC_TYPES___CALL_ONCE_FUNC_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/__dl_iterate_phdr_callback_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/__dl_iterate_phdr_callback_t.h
new file mode 100644
index 000000000000..52078daf7d3c
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/__dl_iterate_phdr_callback_t.h
@@ -0,0 +1,19 @@
+//===-- Definition of type __dl_iterate_phdr_callback_t ------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES___DL_ITERATE_PHDR_CALLBACK_T_H
+#define LLVM_LIBC_TYPES___DL_ITERATE_PHDR_CALLBACK_T_H
+
+#include "size_t.h"
+
+struct dl_phdr_info;
+
+typedef int (*__dl_iterate_phdr_callback_t)(struct dl_phdr_info *, size_t,
+                                            void *);
+
+#endif // LLVM_LIBC_TYPES___DL_ITERATE_PHDR_CALLBACK_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/__exec_argv_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/__exec_argv_t.h
new file mode 100644
index 000000000000..4eff583768af
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/__exec_argv_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of type __exec_argv_t ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES___EXEC_ARGV_T_H
+#define LLVM_LIBC_TYPES___EXEC_ARGV_T_H
+
+typedef char *const __exec_argv_t[];
+
+#endif // LLVM_LIBC_TYPES___EXEC_ARGV_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/__exec_envp_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/__exec_envp_t.h
new file mode 100644
index 000000000000..89e02754c4e4
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/__exec_envp_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of type __exec_envp_t ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES___EXEC_ENVP_T_H
+#define LLVM_LIBC_TYPES___EXEC_ENVP_T_H
+
+typedef char *const __exec_envp_t[];
+
+#endif // LLVM_LIBC_TYPES___EXEC_ENVP_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/__futex_word.h b/contrib/llvm-project/libc/include/llvm-libc-types/__futex_word.h
new file mode 100644
index 000000000000..04023c7e2d5f
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/__futex_word.h
@@ -0,0 +1,20 @@
+//===-- Definition of type which can represent a futex word ---------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES___FUTEX_WORD_H
+#define LLVM_LIBC_TYPES___FUTEX_WORD_H
+
+typedef struct {
+  // Futex word should be aligned appropriately to allow target atomic
+  // instructions. This declaration mimics the internal setup.
+  _Alignas(sizeof(__UINT32_TYPE__) > _Alignof(__UINT32_TYPE__)
+               ? sizeof(__UINT32_TYPE__)
+               : _Alignof(__UINT32_TYPE__)) __UINT32_TYPE__ __word;
+} __futex_word;
+
+#endif // LLVM_LIBC_TYPES___FUTEX_WORD_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/__getoptargv_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/__getoptargv_t.h
new file mode 100644
index 000000000000..c26b9e9fa619
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/__getoptargv_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of type __getoptargv_t ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES___GETOPTARGV_T_H
+#define LLVM_LIBC_TYPES___GETOPTARGV_T_H
+
+typedef char *const __getoptargv_t[];
+
+#endif // LLVM_LIBC_TYPES___GETOPTARGV_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/__mutex_type.h b/contrib/llvm-project/libc/include/llvm-libc-types/__mutex_type.h
new file mode 100644
index 000000000000..835561626149
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/__mutex_type.h
@@ -0,0 +1,29 @@
+//===-- Definition of a common mutex type ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES___MUTEX_TYPE_H
+#define LLVM_LIBC_TYPES___MUTEX_TYPE_H
+
+#include "__futex_word.h"
+
+typedef struct {
+  unsigned char __timed;
+  unsigned char __recursive;
+  unsigned char __robust;
+
+  void *__owner;
+  unsigned long long __lock_count;
+
+#ifdef __linux__
+  __futex_word __ftxw;
+#else
+#error "Mutex type not defined for the target platform."
+#endif
+} __mutex_type;
+
+#endif // LLVM_LIBC_TYPES___MUTEX_TYPE_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/__pthread_once_func_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/__pthread_once_func_t.h
new file mode 100644
index 000000000000..7575029f08c2
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/__pthread_once_func_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of __pthread_once_func_t type --------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES___PTHREAD_ONCE_FUNC_T_H
+#define LLVM_LIBC_TYPES___PTHREAD_ONCE_FUNC_T_H
+
+typedef void (*__pthread_once_func_t)(void);
+
+#endif // LLVM_LIBC_TYPES___PTHREAD_ONCE_FUNC_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/__pthread_start_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/__pthread_start_t.h
new file mode 100644
index 000000000000..6b7ae40b1b77
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/__pthread_start_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of __pthread_start_t type ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES___PTHREAD_START_T_H
+#define LLVM_LIBC_TYPES___PTHREAD_START_T_H
+
+typedef void *(*__pthread_start_t)(void *);
+
+#endif // LLVM_LIBC_TYPES___PTHREAD_START_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/__pthread_tss_dtor_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/__pthread_tss_dtor_t.h
new file mode 100644
index 000000000000..c67b6045936d
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/__pthread_tss_dtor_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of the type __pthread_tss_dtor_t -----------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES___PTHREAD_TSS_DTOR_T_H
+#define LLVM_LIBC_TYPES___PTHREAD_TSS_DTOR_T_H
+
+typedef void (*__pthread_tss_dtor_t)(void *);
+
+#endif // LLVM_LIBC_TYPES___PTHREAD_TSS_DTOR_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/__qsortcompare_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/__qsortcompare_t.h
new file mode 100644
index 000000000000..48fc9ccb4409
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/__qsortcompare_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of type __qsortcompare_t -------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES___QSORTCOMPARE_T_H
+#define LLVM_LIBC_TYPES___QSORTCOMPARE_T_H
+
+typedef int (*__qsortcompare_t)(const void *, const void *);
+
+#endif // LLVM_LIBC_TYPES___QSORTCOMPARE_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/__qsortrcompare_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/__qsortrcompare_t.h
new file mode 100644
index 000000000000..f6b058864359
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/__qsortrcompare_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of type __qsortrcompare_t ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES___QSORTRCOMPARE_T_H
+#define LLVM_LIBC_TYPES___QSORTRCOMPARE_T_H
+
+typedef int (*__qsortrcompare_t)(const void *, const void *, void *);
+
+#endif // LLVM_LIBC_TYPES___QSORTRCOMPARE_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/__search_compare_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/__search_compare_t.h
new file mode 100644
index 000000000000..7033fef49b49
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/__search_compare_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of type __search_compare_t -----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES___SEARCH_COMPARE_T_H
+#define LLVM_LIBC_TYPES___SEARCH_COMPARE_T_H
+
+typedef int (*__search_compare_t)(const void *, const void *);
+
+#endif // LLVM_LIBC_TYPES___SEARCH_COMPARE_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/__thread_type.h b/contrib/llvm-project/libc/include/llvm-libc-types/__thread_type.h
new file mode 100644
index 000000000000..645573f544a9
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/__thread_type.h
@@ -0,0 +1,16 @@
+//===-- Definition of thrd_t type -----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES___THREAD_TYPE_H
+#define LLVM_LIBC_TYPES___THREAD_TYPE_H
+
+typedef struct {
+  void *__attrib;
+} __thread_type;
+
+#endif // LLVM_LIBC_TYPES___THREAD_TYPE_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/blkcnt_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/blkcnt_t.h
new file mode 100644
index 000000000000..9dea8f033d6d
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/blkcnt_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of blkcnt_t type ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_BLKCNT_T_H
+#define LLVM_LIBC_TYPES_BLKCNT_T_H
+
+typedef __INTPTR_TYPE__ blkcnt_t;
+
+#endif // LLVM_LIBC_TYPES_BLKCNT_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/blksize_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/blksize_t.h
new file mode 100644
index 000000000000..7caa9705cca3
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/blksize_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of blksize_t type --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_BLKSIZE_T_H
+#define LLVM_LIBC_TYPES_BLKSIZE_T_H
+
+typedef __INTPTR_TYPE__ blksize_t;
+
+#endif // LLVM_LIBC_TYPES_BLKSIZE_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/cc_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/cc_t.h
new file mode 100644
index 000000000000..40d99ad22da2
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/cc_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of cc_t type -------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_CC_T_H
+#define LLVM_LIBC_TYPES_CC_T_H
+
+typedef unsigned char cc_t;
+
+#endif // LLVM_LIBC_TYPES_CC_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/cfloat128.h b/contrib/llvm-project/libc/include/llvm-libc-types/cfloat128.h
new file mode 100644
index 000000000000..83fad8791013
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/cfloat128.h
@@ -0,0 +1,44 @@
+//===-- Definition of cfloat128 type --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_CFLOAT128_H
+#define LLVM_LIBC_TYPES_CFLOAT128_H
+
+#include "../llvm-libc-macros/float-macros.h" // LDBL_MANT_DIG
+
+// Currently, the complex variant of C23 `_Float128` type is only defined as a
+// built-in type in GCC 7 or later, for C and in GCC 13 or later, for C++. For
+// clang, the complex variant of `__float128` is defined instead, and only on
+// x86-64 targets for clang 11 or later.
+//
+// TODO: Update the complex variant of C23 `_Float128` type detection again when
+// clang supports it.
+#ifdef __clang__
+#if (__clang_major__ >= 11) &&                                                 \
+    (defined(__FLOAT128__) || defined(__SIZEOF_FLOAT128__))
+// Use _Complex __float128 type. clang uses __SIZEOF_FLOAT128__ or __FLOAT128__
+// macro to notify the availability of __float128 type:
+// https://reviews.llvm.org/D15120
+#define LIBC_TYPES_HAS_CFLOAT128
+typedef _Complex __float128 cfloat128;
+#endif
+#elif defined(__GNUC__)
+#if (defined(__STDC_IEC_60559_COMPLEX__) || defined(__SIZEOF_FLOAT128__)) &&   \
+    (__GNUC__ >= 13 || (!defined(__cplusplus)))
+#define LIBC_TYPES_HAS_CFLOAT128
+typedef _Complex _Float128 cfloat128;
+#endif
+#endif
+
+#if !defined(LIBC_TYPES_HAS_CFLOAT128) && (LDBL_MANT_DIG == 113)
+#define LIBC_TYPES_HAS_CFLOAT128
+#define LIBC_TYPES_CFLOAT128_IS_COMPLEX_LONG_DOUBLE
+typedef _Complex long double cfloat128;
+#endif
+
+#endif // LLVM_LIBC_TYPES_CFLOAT128_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/cfloat16.h b/contrib/llvm-project/libc/include/llvm-libc-types/cfloat16.h
new file mode 100644
index 000000000000..2d4cef756272
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/cfloat16.h
@@ -0,0 +1,21 @@
+//===-- Definition of cfloat16 type ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_CFLOAT16_H
+#define LLVM_LIBC_TYPES_CFLOAT16_H
+
+#if defined(__FLT16_MANT_DIG__) &&                                             \
+    (!defined(__GNUC__) || __GNUC__ >= 13 ||                                   \
+     (defined(__clang__) && __clang_major__ >= 14)) &&                         \
+    !defined(__arm__) && !defined(_M_ARM) && !defined(__riscv) &&              \
+    !defined(_WIN32)
+#define LIBC_TYPES_HAS_CFLOAT16
+typedef _Complex _Float16 cfloat16;
+#endif
+
+#endif // LLVM_LIBC_TYPES_CFLOAT16_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/char16_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/char16_t.h
new file mode 100644
index 000000000000..1f5847ae771b
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/char16_t.h
@@ -0,0 +1,17 @@
+//===-- Definition of char16_t type ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_CHAR16_T_H
+#define LLVM_LIBC_TYPES_CHAR16_T_H
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
+#include "../llvm-libc-macros/stdint-macros.h"
+typedef uint_least16_t char16_t;
+#endif
+
+#endif // LLVM_LIBC_TYPES_CHAR16_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/char32_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/char32_t.h
new file mode 100644
index 000000000000..20b72dc5d67e
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/char32_t.h
@@ -0,0 +1,17 @@
+//===-- Definition of char32_t type ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_CHAR32_T_H
+#define LLVM_LIBC_TYPES_CHAR32_T_H
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
+#include "../llvm-libc-macros/stdint-macros.h"
+typedef uint_least32_t char32_t;
+#endif
+
+#endif // LLVM_LIBC_TYPES_CHAR32_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/char8_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/char8_t.h
new file mode 100644
index 000000000000..a343be77d810
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/char8_t.h
@@ -0,0 +1,16 @@
+//===-- Definition of char8_t type ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_CHAR8_T_H
+#define LLVM_LIBC_TYPES_CHAR8_T_H
+
+#if !(defined(__cplusplus) && defined(__cpp_char8_t))
+typedef unsigned char char8_t;
+#endif
+
+#endif // LLVM_LIBC_TYPES_CHAR8_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/clock_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/clock_t.h
new file mode 100644
index 000000000000..8759ee999fb5
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/clock_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of clock_t type ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_CLOCK_T_H
+#define LLVM_LIBC_TYPES_CLOCK_T_H
+
+typedef long clock_t;
+
+#endif // LLVM_LIBC_TYPES_CLOCK_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/clockid_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/clockid_t.h
new file mode 100644
index 000000000000..4b059599502c
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/clockid_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of the type clockid_t ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_CLOCKID_T_H
+#define LLVM_LIBC_TYPES_CLOCKID_T_H
+
+typedef int clockid_t;
+
+#endif // LLVM_LIBC_TYPES_CLOCKID_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/cnd_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/cnd_t.h
new file mode 100644
index 000000000000..77ec58352f07
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/cnd_t.h
@@ -0,0 +1,20 @@
+//===-- Definition of cnd_t type ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_CND_T_H
+#define LLVM_LIBC_TYPES_CND_T_H
+
+#include "__futex_word.h"
+
+typedef struct {
+  void *__qfront;
+  void *__qback;
+  __futex_word __qmtx;
+} cnd_t;
+
+#endif // LLVM_LIBC_TYPES_CND_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/cookie_io_functions_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/cookie_io_functions_t.h
new file mode 100644
index 000000000000..d1eea8ff3b5d
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/cookie_io_functions_t.h
@@ -0,0 +1,28 @@
+//===-- Definition of type cookie_io_functions_t --------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_COOKIE_IO_FUNCTIONS_T_H
+#define LLVM_LIBC_TYPES_COOKIE_IO_FUNCTIONS_T_H
+
+#include "off64_t.h"
+#include "size_t.h"
+#include "ssize_t.h"
+
+typedef ssize_t cookie_read_function_t(void *, char *, size_t);
+typedef ssize_t cookie_write_function_t(void *, const char *, size_t);
+typedef int cookie_seek_function_t(void *, off64_t *, int);
+typedef int cookie_close_function_t(void *);
+
+typedef struct {
+  cookie_read_function_t *read;
+  cookie_write_function_t *write;
+  cookie_seek_function_t *seek;
+  cookie_close_function_t *close;
+} cookie_io_functions_t;
+
+#endif // LLVM_LIBC_TYPES_COOKIE_IO_FUNCTIONS_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/cpu_set_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/cpu_set_t.h
new file mode 100644
index 000000000000..8c6859de5f1d
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/cpu_set_t.h
@@ -0,0 +1,21 @@
+//===-- Definition of a cpu_set_t type ------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_CPU_SET_T_H
+#define LLVM_LIBC_TYPES_CPU_SET_T_H
+
+#define __CPU_SETSIZE 1024
+#define __NCPUBITS (8 * sizeof(unsigned long))
+
+typedef struct {
+  // If a processor with more than 1024 CPUs is to be supported in future,
+  // we need to adjust the size of this array.
+  unsigned long __mask[128 / sizeof(unsigned long)];
+} cpu_set_t;
+
+#endif // LLVM_LIBC_TYPES_CPU_SET_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/dev_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/dev_t.h
new file mode 100644
index 000000000000..3181e3415f2e
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/dev_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of dev_t type ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_DEV_T_H
+#define LLVM_LIBC_TYPES_DEV_T_H
+
+typedef __UINT64_TYPE__ dev_t;
+
+#endif // LLVM_LIBC_TYPES_DEV_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/div_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/div_t.h
new file mode 100644
index 000000000000..450603d69f35
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/div_t.h
@@ -0,0 +1,17 @@
+//===-- Definition of type div_t ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_DIV_T_H
+#define LLVM_LIBC_TYPES_DIV_T_H
+
+typedef struct {
+  int quot;
+  int rem;
+} div_t;
+
+#endif // LLVM_LIBC_TYPES_DIV_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/double_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/double_t.h
new file mode 100644
index 000000000000..c4ad08afddfa
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/double_t.h
@@ -0,0 +1,24 @@
+//===-- Definition of double_t type ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_DOUBLE_T_H
+#define LLVM_LIBC_TYPES_DOUBLE_T_H
+
+#if !defined(__FLT_EVAL_METHOD__) || __FLT_EVAL_METHOD__ == 0
+#define __LLVM_LIBC_DOUBLE_T double
+#elif __FLT_EVAL_METHOD__ == 1
+#define __LLVM_LIBC_DOUBLE_T double
+#elif __FLT_EVAL_METHOD__ == 2
+#define __LLVM_LIBC_DOUBLE_T long double
+#else
+#error "Unsupported __FLT_EVAL_METHOD__ value."
+#endif
+
+typedef __LLVM_LIBC_DOUBLE_T double_t;
+
+#endif // LLVM_LIBC_TYPES_DOUBLE_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/fd_set.h b/contrib/llvm-project/libc/include/llvm-libc-types/fd_set.h
new file mode 100644
index 000000000000..52b716185566
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/fd_set.h
@@ -0,0 +1,18 @@
+//===-- Definition of fd_set type -----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_FD_SET_H
+#define LLVM_LIBC_TYPES_FD_SET_H
+
+#include "../llvm-libc-macros/sys-select-macros.h" // __FD_SET_WORD_TYPE, __FD_SET_ARRAYSIZE
+
+typedef struct {
+  __FD_SET_WORD_TYPE __set[__FD_SET_ARRAYSIZE];
+} fd_set;
+
+#endif // LLVM_LIBC_TYPES_FD_SET_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/fenv_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/fenv_t.h
new file mode 100644
index 000000000000..c83f23894c0c
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/fenv_t.h
@@ -0,0 +1,36 @@
+//===-- Definition of type fenv_t -----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_FENV_T_H
+#define LLVM_LIBC_TYPES_FENV_T_H
+
+#ifdef __aarch64__
+typedef struct {
+  unsigned char __control_word[4];
+  unsigned char __status_word[4];
+} fenv_t;
+#elif defined(__x86_64__)
+typedef struct {
+  unsigned char __x86_status[28];
+  unsigned char __mxcsr[4];
+} fenv_t;
+#elif defined(__arm__) || defined(_M_ARM)
+typedef struct {
+  unsigned int __fpscr;
+} fenv_t;
+#elif defined(__riscv)
+typedef unsigned int fenv_t;
+#elif defined(__AMDGPU__) || defined(__NVPTX__)
+typedef struct {
+  unsigned int __fpc;
+} fenv_t;
+#else
+#error "fenv_t not defined for your platform"
+#endif
+
+#endif // LLVM_LIBC_TYPES_FENV_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/fexcept_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/fexcept_t.h
new file mode 100644
index 000000000000..5aa09fbbaffc
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/fexcept_t.h
@@ -0,0 +1,18 @@
+//===-- Definition of fexcept_t type --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_FEXCEPT_T_H
+#define LLVM_LIBC_TYPES_FEXCEPT_T_H
+
+#if defined(__x86_64__) || defined(__i386__)
+typedef unsigned short int fexcept_t;
+#else
+typedef unsigned int fexcept_t;
+#endif
+
+#endif // LLVM_LIBC_TYPES_FEXCEPT_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/float128.h b/contrib/llvm-project/libc/include/llvm-libc-types/float128.h
new file mode 100644
index 000000000000..82ebb79f1f58
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/float128.h
@@ -0,0 +1,36 @@
+//===-- Definition of float128 type ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_FLOAT128_H
+#define LLVM_LIBC_TYPES_FLOAT128_H
+
+#include "../llvm-libc-macros/float-macros.h" // LDBL_MANT_DIG
+
+// Currently, C23 `_Float128` type is only defined as a built-in type in GCC 7
+// or later, and only for C.  For C++, or for clang, `__float128` is defined
+// instead, and only on x86-64 targets.
+//
+// TODO: Update C23 `_Float128` type detection again when clang supports it.
+//   https://github.com/llvm/llvm-project/issues/80195
+#if defined(__STDC_IEC_60559_BFP__) && !defined(__clang__) &&                  \
+    !defined(__cplusplus)
+#define LIBC_TYPES_HAS_FLOAT128
+typedef _Float128 float128;
+#elif defined(__FLOAT128__) || defined(__SIZEOF_FLOAT128__)
+// Use __float128 type.  gcc and clang sometime use __SIZEOF_FLOAT128__ to
+// notify the availability of __float128.
+// clang also uses __FLOAT128__ macro to notify the availability of __float128
+// type: https://reviews.llvm.org/D15120
+#define LIBC_TYPES_HAS_FLOAT128
+typedef __float128 float128;
+#elif (LDBL_MANT_DIG == 113)
+#define LIBC_TYPES_HAS_FLOAT128
+typedef long double float128;
+#endif
+
+#endif // LLVM_LIBC_TYPES_FLOAT128_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/float_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/float_t.h
new file mode 100644
index 000000000000..5027249c30d3
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/float_t.h
@@ -0,0 +1,24 @@
+//===-- Definition of float_t type ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_FLOAT_T_H
+#define LLVM_LIBC_TYPES_FLOAT_T_H
+
+#if !defined(__FLT_EVAL_METHOD__) || __FLT_EVAL_METHOD__ == 0
+#define __LLVM_LIBC_FLOAT_T float
+#elif __FLT_EVAL_METHOD__ == 1
+#define __LLVM_LIBC_FLOAT_T double
+#elif __FLT_EVAL_METHOD__ == 2
+#define __LLVM_LIBC_FLOAT_T long double
+#else
+#error "Unsupported __FLT_EVAL_METHOD__ value."
+#endif
+
+typedef __LLVM_LIBC_FLOAT_T float_t;
+
+#endif // LLVM_LIBC_TYPES_FLOAT_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/fsblkcnt_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/fsblkcnt_t.h
new file mode 100644
index 000000000000..8c7d3307278c
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/fsblkcnt_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of fsblkcnt_t type -------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_FSBLKCNT_T_H
+#define LLVM_LIBC_TYPES_FSBLKCNT_T_H
+
+typedef __UINT64_TYPE__ fsblkcnt_t;
+
+#endif // LLVM_LIBC_TYPES_FSBLKCNT_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/fsfilcnt_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/fsfilcnt_t.h
new file mode 100644
index 000000000000..12697830e92e
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/fsfilcnt_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of fsfilcnt_t type -------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_FSFILCNT_T_H
+#define LLVM_LIBC_TYPES_FSFILCNT_T_H
+
+typedef __UINT64_TYPE__ fsfilcnt_t;
+
+#endif // LLVM_LIBC_TYPES_FSFILCNT_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/gid_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/gid_t.h
new file mode 100644
index 000000000000..cfe36ce9906b
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/gid_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of gid_t type ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_GID_T_H
+#define LLVM_LIBC_TYPES_GID_T_H
+
+typedef __UINT32_TYPE__ gid_t;
+
+#endif // LLVM_LIBC_TYPES_GID_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/imaxdiv_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/imaxdiv_t.h
new file mode 100644
index 000000000000..5062b643065a
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/imaxdiv_t.h
@@ -0,0 +1,17 @@
+//===-- Definition of type imaxdiv_t --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_LIBC_TYPES_IMAXDIV_T_H__
+#define __LLVM_LIBC_TYPES_IMAXDIV_T_H__
+
+typedef struct {
+  intmax_t quot;
+  intmax_t rem;
+} imaxdiv_t;
+
+#endif // __LLVM_LIBC_TYPES_IMAXDIV_T_H__
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/ino_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/ino_t.h
new file mode 100644
index 000000000000..148bd67f98fe
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/ino_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of ino_t type ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_INO_T_H
+#define LLVM_LIBC_TYPES_INO_T_H
+
+typedef __UINTPTR_TYPE__ ino_t;
+
+#endif // LLVM_LIBC_TYPES_INO_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/jmp_buf.h b/contrib/llvm-project/libc/include/llvm-libc-types/jmp_buf.h
new file mode 100644
index 000000000000..8a7d2839e21d
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/jmp_buf.h
@@ -0,0 +1,84 @@
+//===-- Definition of type jmp_buf ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_JMP_BUF_H
+#define LLVM_LIBC_TYPES_JMP_BUF_H
+
+// TODO: implement sigjmp_buf related functions for other architectures
+// Issue: https://github.com/llvm/llvm-project/issues/136358
+#if defined(__linux__)
+#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) ||        \
+    defined(__arm__) || defined(__riscv)
+#define __LIBC_HAS_SIGJMP_BUF
+#endif
+#endif
+
+#if defined(__LIBC_HAS_SIGJMP_BUF)
+#include "sigset_t.h"
+#endif
+
+typedef struct {
+#ifdef __x86_64__
+  __UINT64_TYPE__ rbx;
+  __UINT64_TYPE__ rbp;
+  __UINT64_TYPE__ r12;
+  __UINT64_TYPE__ r13;
+  __UINT64_TYPE__ r14;
+  __UINT64_TYPE__ r15;
+  __UINTPTR_TYPE__ rsp;
+  __UINTPTR_TYPE__ rip;
+#elif defined(__i386__)
+  long ebx;
+  long esi;
+  long edi;
+  long ebp;
+  long esp;
+  long eip;
+#elif defined(__riscv)
+  /* Program counter.  */
+  long int __pc;
+  /* Callee-saved registers.  */
+  long int __regs[12];
+  /* Stack pointer.  */
+  long int __sp;
+  /* Callee-saved floating point registers.  */
+#if __riscv_float_abi_double
+  double __fpregs[12];
+#elif defined(__riscv_float_abi_single)
+#error "__jmp_buf not available for your target architecture."
+#endif
+#elif defined(__arm__)
+  // r4, r5, r6, r7, r8, r9, r10, r11, r12, lr
+  long opaque[10];
+#elif defined(__aarch64__)
+  long opaque[14]; // x19-x29, lr, sp, optional x18
+#if __ARM_FP
+  long fopaque[8]; // d8-d15
+#endif
+#else
+#error "__jmp_buf not available for your target architecture."
+#endif
+#if defined(__LIBC_HAS_SIGJMP_BUF)
+  // return address
+  void *sig_retaddr;
+  // extra register buffer to avoid indefinite stack growth in sigsetjmp
+  void *sig_extra;
+  // signal masks
+  sigset_t sigmask;
+#endif
+} __jmp_buf;
+
+typedef __jmp_buf jmp_buf[1];
+
+#if defined(__LIBC_HAS_SIGJMP_BUF)
+typedef __jmp_buf sigjmp_buf[1];
+#endif
+
+#undef __LIBC_HAS_SIGJMP_BUF
+
+#endif // LLVM_LIBC_TYPES_JMP_BUF_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/ldiv_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/ldiv_t.h
new file mode 100644
index 000000000000..5c64ec10d918
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/ldiv_t.h
@@ -0,0 +1,17 @@
+//===-- Definition of type ldiv_t -----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_LDIV_T_H
+#define LLVM_LIBC_TYPES_LDIV_T_H
+
+typedef struct {
+  long quot;
+  long rem;
+} ldiv_t;
+
+#endif // LLVM_LIBC_TYPES_LDIV_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/lldiv_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/lldiv_t.h
new file mode 100644
index 000000000000..5b8dcbef9470
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/lldiv_t.h
@@ -0,0 +1,17 @@
+//===-- Definition of type lldiv_t ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_LLDIV_T_H
+#define LLVM_LIBC_TYPES_LLDIV_T_H
+
+typedef struct {
+  long long quot;
+  long long rem;
+} lldiv_t;
+
+#endif // LLVM_LIBC_TYPES_LLDIV_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/locale_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/locale_t.h
new file mode 100644
index 000000000000..6d783001acf9
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/locale_t.h
@@ -0,0 +1,22 @@
+//===-- Definition of type locale_t ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_LOCALE_T_H
+#define LLVM_LIBC_TYPES_LOCALE_T_H
+
+#define NUM_LOCALE_CATEGORIES 6
+
+struct __locale_data;
+
+struct __locale_t {
+  struct __locale_data *data[NUM_LOCALE_CATEGORIES];
+};
+
+typedef struct __locale_t *locale_t;
+
+#endif // LLVM_LIBC_TYPES_LOCALE_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/mbstate_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/mbstate_t.h
new file mode 100644
index 000000000000..009fe57da50e
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/mbstate_t.h
@@ -0,0 +1,20 @@
+//===-- Definition of mbstate_t type --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_MBSTATE_T_H
+#define LLVM_LIBC_TYPES_MBSTATE_T_H
+
+#include "../llvm-libc-macros/stdint-macros.h"
+
+typedef struct {
+  uint32_t __field1;
+  uint8_t __field2;
+  uint8_t __field3;
+} mbstate_t;
+
+#endif // LLVM_LIBC_TYPES_MBSTATE_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/mode_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/mode_t.h
new file mode 100644
index 000000000000..fe09060d9a6e
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/mode_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of mode_t type -----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_MODE_T_H
+#define LLVM_LIBC_TYPES_MODE_T_H
+
+typedef unsigned mode_t;
+
+#endif // LLVM_LIBC_TYPES_MODE_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/mtx_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/mtx_t.h
new file mode 100644
index 000000000000..56e41bdf89bc
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/mtx_t.h
@@ -0,0 +1,16 @@
+//===-- Definition of mtx_t type ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_MTX_T_H
+#define LLVM_LIBC_TYPES_MTX_T_H
+
+#include "__mutex_type.h"
+
+typedef __mutex_type mtx_t;
+
+#endif // LLVM_LIBC_TYPES_MTX_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/nfds_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/nfds_t.h
new file mode 100644
index 000000000000..c0abccee8a7d
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/nfds_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of type nfds_t -----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_NFDS_T_H
+#define LLVM_LIBC_TYPES_NFDS_T_H
+
+typedef unsigned int nfds_t;
+
+#endif // LLVM_LIBC_TYPES_NFDS_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/nlink_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/nlink_t.h
new file mode 100644
index 000000000000..7e0016a9af95
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/nlink_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of nlink_t type ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_NLINK_T_H
+#define LLVM_LIBC_TYPES_NLINK_T_H
+
+typedef __UINTPTR_TYPE__ nlink_t;
+
+#endif // LLVM_LIBC_TYPES_NLINK_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/off64_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/off64_t.h
new file mode 100644
index 000000000000..669698a8c05f
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/off64_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of off64_t type ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_OFF64_T_H
+#define LLVM_LIBC_TYPES_OFF64_T_H
+
+typedef __INT64_TYPE__ off64_t;
+
+#endif // LLVM_LIBC_TYPES_OFF64_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/off_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/off_t.h
new file mode 100644
index 000000000000..63224b6831d5
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/off_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of off_t type ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_OFF_T_H
+#define LLVM_LIBC_TYPES_OFF_T_H
+
+typedef __INT64_TYPE__ off_t;
+
+#endif // LLVM_LIBC_TYPES_OFF_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/once_flag.h b/contrib/llvm-project/libc/include/llvm-libc-types/once_flag.h
new file mode 100644
index 000000000000..b3b7e0de988c
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/once_flag.h
@@ -0,0 +1,20 @@
+//===-- Definition of once_flag type --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_ONCE_FLAG_H
+#define LLVM_LIBC_TYPES_ONCE_FLAG_H
+
+#include "__futex_word.h"
+
+#ifdef __linux__
+typedef __futex_word once_flag;
+#else
+#error "Once flag type not defined for the target platform."
+#endif
+
+#endif // LLVM_LIBC_TYPES_ONCE_FLAG_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/pid_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/pid_t.h
new file mode 100644
index 000000000000..0397bd249032
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/pid_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of pid_t type ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_PID_T_H
+#define LLVM_LIBC_TYPES_PID_T_H
+
+typedef __INT32_TYPE__ pid_t;
+
+#endif // LLVM_LIBC_TYPES_PID_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/posix_spawn_file_actions_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/posix_spawn_file_actions_t.h
new file mode 100644
index 000000000000..3062da3a54b5
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/posix_spawn_file_actions_t.h
@@ -0,0 +1,17 @@
+//===-- Definition of type posix_spawn_file_actions_t ---------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_POSIX_SPAWN_FILE_ACTIONS_T_H
+#define LLVM_LIBC_TYPES_POSIX_SPAWN_FILE_ACTIONS_T_H
+
+typedef struct {
+  void *__front;
+  void *__back;
+} posix_spawn_file_actions_t;
+
+#endif // LLVM_LIBC_TYPES_POSIX_SPAWN_FILE_ACTIONS_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/posix_spawnattr_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/posix_spawnattr_t.h
new file mode 100644
index 000000000000..47cadc7cdda1
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/posix_spawnattr_t.h
@@ -0,0 +1,16 @@
+//===-- Definition of type posix_spawn_file_actions_t ---------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_POSIX_SPAWNATTR_T_H
+#define LLVM_LIBC_TYPES_POSIX_SPAWNATTR_T_H
+
+typedef struct {
+  // This data structure will be populated as required.
+} posix_spawnattr_t;
+
+#endif // LLVM_LIBC_TYPES_POSIX_SPAWNATTR_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/pthread_attr_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_attr_t.h
new file mode 100644
index 000000000000..e686ac91a6fe
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_attr_t.h
@@ -0,0 +1,21 @@
+//===-- Definition of pthread_attr_t type ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_PTHREAD_ATTR_T_H
+#define LLVM_LIBC_TYPES_PTHREAD_ATTR_T_H
+
+#include "size_t.h"
+
+typedef struct {
+  int __detachstate;
+  void *__stack;
+  size_t __stacksize;
+  size_t __guardsize;
+} pthread_attr_t;
+
+#endif // LLVM_LIBC_TYPES_PTHREAD_ATTR_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/pthread_condattr_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_condattr_t.h
new file mode 100644
index 000000000000..b91fc2950aa3
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_condattr_t.h
@@ -0,0 +1,18 @@
+//===-- Definition of pthread_condattr_t type -----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_TYPES_PTHREAD_CONDATTR_T_H
+#define LLVM_LIBC_TYPES_PTHREAD_CONDATTR_T_H
+
+#include "clockid_t.h"
+
+typedef struct {
+  clockid_t clock;
+  int pshared;
+} pthread_condattr_t;
+
+#endif // LLVM_LIBC_TYPES_PTHREAD_CONDATTR_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/pthread_key_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_key_t.h
new file mode 100644
index 000000000000..e73c7e26c17c
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_key_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of the type pthread_key_t ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_PTHREAD_KEY_T_H
+#define LLVM_LIBC_TYPES_PTHREAD_KEY_T_H
+
+typedef unsigned int pthread_key_t;
+
+#endif // LLVM_LIBC_TYPES_PTHREAD_KEY_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/pthread_mutex_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_mutex_t.h
new file mode 100644
index 000000000000..1535cba65835
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_mutex_t.h
@@ -0,0 +1,16 @@
+//===-- Definition of pthread_mutex_t type --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_PTHREAD_MUTEX_T_H
+#define LLVM_LIBC_TYPES_PTHREAD_MUTEX_T_H
+
+#include "__mutex_type.h"
+
+typedef __mutex_type pthread_mutex_t;
+
+#endif // LLVM_LIBC_TYPES_PTHREAD_MUTEX_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/pthread_mutexattr_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_mutexattr_t.h
new file mode 100644
index 000000000000..8f159a61420c
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_mutexattr_t.h
@@ -0,0 +1,16 @@
+//===-- Definition of pthread_mutexattr_t type ----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_PTHREAD_MUTEXATTR_T_H
+#define LLVM_LIBC_TYPES_PTHREAD_MUTEXATTR_T_H
+
+// pthread_mutexattr_t is a collection bit mapped flags. The mapping is internal
+// detail of the libc implementation.
+typedef unsigned int pthread_mutexattr_t;
+
+#endif // LLVM_LIBC_TYPES_PTHREAD_MUTEXATTR_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/pthread_once_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_once_t.h
new file mode 100644
index 000000000000..12a81502baaf
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_once_t.h
@@ -0,0 +1,20 @@
+//===-- Definition of pthread_once_t type ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_PTHREAD_ONCE_T_H
+#define LLVM_LIBC_TYPES_PTHREAD_ONCE_T_H
+
+#include "__futex_word.h"
+
+#ifdef __linux__
+typedef __futex_word pthread_once_t;
+#else
+#error "Once flag type not defined for the target platform."
+#endif
+
+#endif // LLVM_LIBC_TYPES_PTHREAD_ONCE_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/pthread_rwlock_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_rwlock_t.h
new file mode 100644
index 000000000000..4a7c6c75250a
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_rwlock_t.h
@@ -0,0 +1,26 @@
+//===-- Definition of pthread_mutex_t type --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_PTHREAD_RWLOCK_T_H
+#define LLVM_LIBC_TYPES_PTHREAD_RWLOCK_T_H
+
+#include "__futex_word.h"
+#include "pid_t.h"
+typedef struct {
+  unsigned __is_pshared : 1;
+  unsigned __preference : 1;
+  int __state;
+  pid_t __writer_tid;
+  __futex_word __wait_queue_mutex;
+  __futex_word __pending_readers;
+  __futex_word __pending_writers;
+  __futex_word __reader_serialization;
+  __futex_word __writer_serialization;
+} pthread_rwlock_t;
+
+#endif // LLVM_LIBC_TYPES_PTHREAD_RWLOCK_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/pthread_rwlockattr_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_rwlockattr_t.h
new file mode 100644
index 000000000000..397c8440402a
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_rwlockattr_t.h
@@ -0,0 +1,16 @@
+//===-- Definition of pthread_rwlockattr_t type ---------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_TYPES_PTHREAD_RWLOCKATTR_T_H
+#define LLVM_LIBC_TYPES_PTHREAD_RWLOCKATTR_T_H
+
+typedef struct {
+  int pshared;
+  int pref;
+} pthread_rwlockattr_t;
+
+#endif // LLVM_LIBC_TYPES_PTHREAD_RWLOCKATTR_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/pthread_spinlock_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_spinlock_t.h
new file mode 100644
index 000000000000..afb4fe91edd2
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_spinlock_t.h
@@ -0,0 +1,17 @@
+//===-- Definition of pthread_spinlock_t type -----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_PTHREAD_SPINLOCK_T_H
+#define LLVM_LIBC_TYPES_PTHREAD_SPINLOCK_T_H
+#include "pid_t.h"
+typedef struct {
+  unsigned char __lockword;
+  pid_t __owner;
+} pthread_spinlock_t;
+
+#endif // LLVM_LIBC_TYPES_PTHREAD_SPINLOCK_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/pthread_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_t.h
new file mode 100644
index 000000000000..f64887b25225
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/pthread_t.h
@@ -0,0 +1,16 @@
+//===-- Definition of pthread_t type --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_PTHREAD_T_H
+#define LLVM_LIBC_TYPES_PTHREAD_T_H
+
+#include "__thread_type.h"
+
+typedef __thread_type pthread_t;
+
+#endif // LLVM_LIBC_TYPES_PTHREAD_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/rlim_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/rlim_t.h
new file mode 100644
index 000000000000..016ec7bdc5b1
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/rlim_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of type rlim_t -----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_RLIM_T_H
+#define LLVM_LIBC_TYPES_RLIM_T_H
+
+typedef __UINT64_TYPE__ rlim_t;
+
+#endif // LLVM_LIBC_TYPES_RLIM_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/sa_family_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/sa_family_t.h
new file mode 100644
index 000000000000..0a010b678ddb
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/sa_family_t.h
@@ -0,0 +1,19 @@
+//===-- Definition of sa_family_t type ------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_SA_FAMILY_T_H
+#define LLVM_LIBC_TYPES_SA_FAMILY_T_H
+
+// The posix standard only says of sa_family_t that it must be unsigned. The
+// linux man page for "address_families" lists approximately 32 different
+// address families, meaning that a short 16 bit number will have plenty of
+// space for all of them.
+
+typedef unsigned short sa_family_t;
+
+#endif // LLVM_LIBC_TYPES_SA_FAMILY_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/sig_atomic_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/sig_atomic_t.h
new file mode 100644
index 000000000000..2ef375806791
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/sig_atomic_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of sig_atomic_t type -----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_SIG_ATOMIC_T_H
+#define LLVM_LIBC_TYPES_SIG_ATOMIC_T_H
+
+typedef int sig_atomic_t;
+
+#endif // LLVM_LIBC_TYPES_SIG_ATOMIC_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/sighandler_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/sighandler_t.h
new file mode 100644
index 000000000000..f39ab0468520
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/sighandler_t.h
@@ -0,0 +1,17 @@
+//===-- Definition of sighandler_t ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_SIGHANDLER_T_H
+#define LLVM_LIBC_TYPES_SIGHANDLER_T_H
+
+#ifdef __linux__
+// For compatibility with glibc.
+typedef void (*sighandler_t)(int);
+#endif
+
+#endif // LLVM_LIBC_TYPES_SIGHANDLER_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/siginfo_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/siginfo_t.h
new file mode 100644
index 000000000000..20fdd461bb6d
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/siginfo_t.h
@@ -0,0 +1,109 @@
+//===-- Definition of siginfo_t type --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_SIGINFO_T_H
+#define LLVM_LIBC_TYPES_SIGINFO_T_H
+
+#include "clock_t.h"
+#include "pid_t.h"
+#include "uid_t.h"
+#include "union_sigval.h"
+
+#define SI_MAX_SIZE 128
+
+typedef struct {
+  int si_signo; /* Signal number.  */
+  int si_errno; /* If non-zero, an errno value associated with
+                   this signal, as defined in <errno.h>.  */
+  int si_code;  /* Signal code.  */
+  union {
+    int _si_pad[SI_MAX_SIZE / sizeof(int)];
+
+    /* kill() */
+    struct {
+      pid_t si_pid; /* sender's pid */
+      uid_t si_uid; /* sender's uid */
+    } _kill;
+
+    /* POSIX.1b timers */
+    struct {
+      int si_tid;             /* timer id */
+      int _overrun;           /* overrun count */
+      union sigval si_sigval; /* same as below */
+    } _timer;
+
+    /* POSIX.1b signals */
+    struct {
+      pid_t si_pid; /* sender's pid */
+      uid_t si_uid; /* sender's uid */
+      union sigval si_sigval;
+    } _rt;
+
+    /* SIGCHLD */
+    struct {
+      pid_t si_pid;  /* which child */
+      uid_t si_uid;  /* sender's uid */
+      int si_status; /* exit code */
+      clock_t si_utime;
+      clock_t si_stime;
+    } _sigchld;
+
+    /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
+    struct {
+      void *si_addr;         /* faulting insn/memory ref. */
+      short int si_addr_lsb; /* Valid LSB of the reported address.  */
+      union {
+        /* used when si_code=SEGV_BNDERR */
+        struct {
+          void *_lower;
+          void *_upper;
+        } _addr_bnd;
+        /* used when si_code=SEGV_PKUERR */
+        __UINT32_TYPE__ _pkey;
+      } _bounds;
+    } _sigfault;
+
+    /* SIGPOLL */
+    struct {
+      long int si_band; /* POLL_IN, POLL_OUT, POLL_MSG */
+      int si_fd;
+    } _sigpoll;
+
+    /* SIGSYS */
+    struct {
+      void *_call_addr;   /* calling user insn */
+      int _syscall;       /* triggering system call number */
+      unsigned int _arch; /* AUDIT_ARCH_* of syscall */
+    } _sigsys;
+  } _sifields;
+} siginfo_t;
+
+#undef SI_MAX_SIZE
+
+#define si_pid _sifields._kill.si_pid
+#define si_uid _sifields._kill.si_uid
+#define si_timerid _sifields._timer.si_tid
+#define si_overrun _sifields._timer.si_overrun
+#define si_status _sifields._sigchld.si_status
+#define si_utime _sifields._sigchld.si_utime
+#define si_stime _sifields._sigchld.si_stime
+#define si_value _sifields._rt.si_sigval
+#define si_int _sifields._rt.si_sigval.sival_int
+#define si_ptr _sifields._rt.si_sigval.sival_ptr
+#define si_addr _sifields._sigfault.si_addr
+#define si_addr_lsb _sifields._sigfault.si_addr_lsb
+#define si_lower _sifields._sigfault._bounds._addr_bnd._lower
+#define si_upper _sifields._sigfault._bounds._addr_bnd._upper
+#define si_pkey _sifields._sigfault._bounds._pkey
+#define si_band _sifields._sigpoll.si_band
+#define si_fd _sifields._sigpoll.si_fd
+#define si_call_addr _sifields._sigsys._call_addr
+#define si_syscall _sifields._sigsys._syscall
+#define si_arch _sifields._sigsys._arch
+
+#endif // LLVM_LIBC_TYPES_SIGINFO_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/sigset_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/sigset_t.h
new file mode 100644
index 000000000000..8c4d3b49533d
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/sigset_t.h
@@ -0,0 +1,20 @@
+//===-- Definition of sigset_t type ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_SIGSET_T_H
+#define LLVM_LIBC_TYPES_SIGSET_T_H
+
+#include "../llvm-libc-macros/signal-macros.h" // __NSIGSET_WORDS
+
+// This definition can be adjusted/specialized for different targets and
+// platforms as necessary. This definition works for Linux on most targets.
+typedef struct {
+  unsigned long __signals[__NSIGSET_WORDS];
+} sigset_t;
+
+#endif // LLVM_LIBC_TYPES_SIGSET_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/size_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/size_t.h
new file mode 100644
index 000000000000..26ae68abe0ee
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/size_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of size_t types ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_SIZE_T_H
+#define LLVM_LIBC_TYPES_SIZE_T_H
+
+typedef __SIZE_TYPE__ size_t;
+
+#endif // LLVM_LIBC_TYPES_SIZE_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/socklen_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/socklen_t.h
new file mode 100644
index 000000000000..5357747f5b83
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/socklen_t.h
@@ -0,0 +1,18 @@
+//===-- Definition of socklen_t type ------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_SOCKLEN_T_H
+#define LLVM_LIBC_TYPES_SOCKLEN_T_H
+
+// The posix standard only says of socklen_t that it must be an integer type of
+// width of at least 32 bits. The long type is defined as being at least 32
+// bits, so an unsigned long should be fine.
+
+typedef unsigned long socklen_t;
+
+#endif // LLVM_LIBC_TYPES_SOCKLEN_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/speed_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/speed_t.h
new file mode 100644
index 000000000000..9875d3b82a69
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/speed_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of speed_t type ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_SPEED_T_H
+#define LLVM_LIBC_TYPES_SPEED_T_H
+
+typedef unsigned int speed_t;
+
+#endif // LLVM_LIBC_TYPES_SPEED_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/ssize_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/ssize_t.h
new file mode 100644
index 000000000000..8f579e2749ba
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/ssize_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of ssize_t type ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_SSIZE_T_H
+#define LLVM_LIBC_TYPES_SSIZE_T_H
+
+typedef __PTRDIFF_TYPE__ ssize_t;
+
+#endif // LLVM_LIBC_TYPES_SSIZE_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/stack_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/stack_t.h
new file mode 100644
index 000000000000..92d030587168
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/stack_t.h
@@ -0,0 +1,22 @@
+//===-- Definition of stack_t type ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STACK_T_H
+#define LLVM_LIBC_TYPES_STACK_T_H
+
+#include "size_t.h"
+
+typedef struct {
+  // The order of the fields declared here should match the kernel definition
+  // of stack_t in order for the SYS_sigaltstack syscall to work correctly.
+  void *ss_sp;
+  int ss_flags;
+  size_t ss_size;
+} stack_t;
+
+#endif // LLVM_LIBC_TYPES_STACK_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/stdfix-types.h b/contrib/llvm-project/libc/include/llvm-libc-types/stdfix-types.h
new file mode 100644
index 000000000000..542d45ea97e9
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/stdfix-types.h
@@ -0,0 +1,25 @@
+//===-- Definition of stdfix integer types --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STDFIX_TYPES_H
+#define LLVM_LIBC_TYPES_STDFIX_TYPES_H
+
+typedef signed char int_hr_t;
+typedef signed short int int_r_t;
+typedef signed int int_lr_t;
+typedef signed short int_hk_t;
+typedef signed int int_k_t;
+typedef signed long long int_lk_t;
+typedef unsigned char uint_uhr_t;
+typedef unsigned short int uint_ur_t;
+typedef unsigned int uint_ulr_t;
+typedef unsigned short int uint_uhk_t;
+typedef unsigned int uint_uk_t;
+typedef unsigned long long uint_ulk_t;
+
+#endif // LLVM_LIBC_TYPES_STDFIX_TYPES_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_dirent.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_dirent.h
new file mode 100644
index 000000000000..f950869fc77d
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_dirent.h
@@ -0,0 +1,29 @@
+//===-- Definition of type struct dirent ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_DIRENT_H
+#define LLVM_LIBC_TYPES_STRUCT_DIRENT_H
+
+#include "ino_t.h"
+#include "off_t.h"
+
+struct dirent {
+  ino_t d_ino;
+#ifdef __linux__
+  off_t d_off;
+  unsigned short d_reclen;
+#endif
+  unsigned char d_type;
+  // The user code should use strlen to determine actual the size of d_name.
+  // Likewise, it is incorrect and prohibited by the POSIX standard to detemine
+  // the size of struct dirent type using sizeof. The size should be got using
+  // a different method, for example, from the d_reclen field on Linux.
+  char d_name[1];
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_DIRENT_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_dl_phdr_info.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_dl_phdr_info.h
new file mode 100644
index 000000000000..2b9a5d21b4a1
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_dl_phdr_info.h
@@ -0,0 +1,30 @@
+//===-- Definition of type struct dl_phdr_info ---------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_DL_PHDR_INFO_H
+#define LLVM_LIBC_TYPES_STRUCT_DL_PHDR_INFO_H
+
+#include "../llvm-libc-macros/link-macros.h"
+#include "size_t.h"
+#include <elf.h>
+#include <stdint.h>
+
+struct dl_phdr_info {
+  ElfW(Addr) dlpi_addr;
+  const char *dlpi_name;
+  const ElfW(Phdr) * dlpi_phdr;
+  ElfW(Half) dlpi_phnum;
+
+  uint64_t dlpi_adds;
+  uint64_t dlpi_subs;
+
+  size_t dlpi_tls_modid;
+  void *dlpi_tls_data;
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_DL_PHDR_INFO_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_epoll_data.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_epoll_data.h
new file mode 100644
index 000000000000..7200276a141e
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_epoll_data.h
@@ -0,0 +1,21 @@
+//===-- Definition of epoll_data type -------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_EPOLL_DATA_H
+#define LLVM_LIBC_TYPES_STRUCT_EPOLL_DATA_H
+
+union epoll_data {
+  void *ptr;
+  int fd;
+  __UINT32_TYPE__ u32;
+  __UINT64_TYPE__ u64;
+};
+
+typedef union epoll_data epoll_data_t;
+
+#endif // LLVM_LIBC_TYPES_STRUCT_EPOLL_DATA_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_epoll_event.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_epoll_event.h
new file mode 100644
index 000000000000..f95fd1a92bc8
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_epoll_event.h
@@ -0,0 +1,23 @@
+//===-- Definition of epoll_event type ------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_EPOLL_EVENT_H
+#define LLVM_LIBC_TYPES_STRUCT_EPOLL_EVENT_H
+
+#include "struct_epoll_data.h"
+
+typedef struct
+#ifdef __x86_64__
+    [[gnu::packed]] // Necessary for compatibility.
+#endif
+    epoll_event {
+  __UINT32_TYPE__ events;
+  epoll_data_t data;
+} epoll_event;
+
+#endif // LLVM_LIBC_TYPES_STRUCT_EPOLL_EVENT_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_f_owner_ex.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_f_owner_ex.h
new file mode 100644
index 000000000000..87d4b8988178
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_f_owner_ex.h
@@ -0,0 +1,25 @@
+//===-- Definition of type struct f_owner_ex ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_F_OWNER_EX_H
+#define LLVM_LIBC_TYPES_STRUCT_F_OWNER_EX_H
+
+#include "pid_t.h"
+
+enum pid_type {
+  F_OWNER_TID = 0,
+  F_OWNER_PID,
+  F_OWNER_PGRP,
+};
+
+struct f_owner_ex {
+  enum pid_type type;
+  pid_t pid;
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_F_OWNER_EX_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_flock.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_flock.h
new file mode 100644
index 000000000000..d4bde09045e8
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_flock.h
@@ -0,0 +1,25 @@
+//===-- Definition of type struct flock64 ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_FLOCK_H
+#define LLVM_LIBC_TYPES_STRUCT_FLOCK_H
+
+#include "off_t.h"
+#include "pid_t.h"
+
+#include <stdint.h>
+
+struct flock {
+  int16_t l_type;
+  int16_t l_whence;
+  off_t l_start;
+  off_t l_len;
+  pid_t l_pid;
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_FLOCK_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_flock64.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_flock64.h
new file mode 100644
index 000000000000..8e485d737738
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_flock64.h
@@ -0,0 +1,25 @@
+//===-- Definition of type struct flock64 ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_FLOCK64_H
+#define LLVM_LIBC_TYPES_STRUCT_FLOCK64_H
+
+#include "off64_t.h"
+#include "pid_t.h"
+
+#include <stdint.h>
+
+struct flock64 {
+  int16_t l_type;
+  int16_t l_whence;
+  off64_t l_start;
+  off64_t l_len;
+  pid_t l_pid;
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_FLOCK64_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_hsearch_data.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_hsearch_data.h
new file mode 100644
index 000000000000..cdb1d0c5da14
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_hsearch_data.h
@@ -0,0 +1,17 @@
+//===-- Definition of type struct hsearch_data ----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_HSEARCH_DATA_H
+#define LLVM_LIBC_TYPES_STRUCT_HSEARCH_DATA_H
+
+struct hsearch_data {
+  void *__opaque;
+  unsigned int __unused[2];
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_HSEARCH_DATA_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_iovec.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_iovec.h
new file mode 100644
index 000000000000..db2ca64cc1a1
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_iovec.h
@@ -0,0 +1,19 @@
+//===-- Definition of struct iovec ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_IOVEC_H
+#define LLVM_LIBC_TYPES_STRUCT_IOVEC_H
+
+#include "size_t.h"
+
+struct iovec {
+  void *iov_base;
+  size_t iov_len;
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_IOVEC_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_itimerval.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_itimerval.h
new file mode 100644
index 000000000000..e23f1e6076df
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_itimerval.h
@@ -0,0 +1,19 @@
+//===-- Definition of struct itimerval ------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_ITIMERVAL_H
+#define LLVM_LIBC_TYPES_STRUCT_ITIMERVAL_H
+
+#include "struct_timeval.h"
+
+struct itimerval {
+  struct timeval it_interval; /* Interval for periodic timer */
+  struct timeval it_value;    /* Time until next expiration */
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_ITIMERVAL_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_lconv.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_lconv.h
new file mode 100644
index 000000000000..9d69f055484d
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_lconv.h
@@ -0,0 +1,39 @@
+//===-- Definition of type lconv ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_LCONV_H
+#define LLVM_LIBC_TYPES_LCONV_H
+
+struct lconv {
+  char *decimal_point;
+  char *thousands_sep;
+  char *grouping;
+  char *mon_decimal_point;
+  char *mon_thousands_sep;
+  char *mon_grouping;
+  char *positive_sign;
+  char *negative_sign;
+  char *currency_symbol;
+  char frac_digits;
+  char p_cs_precedes;
+  char n_cs_precedes;
+  char p_sep_by_space;
+  char n_sep_by_space;
+  char p_sign_posn;
+  char n_sign_posn;
+  char *int_curr_symbol;
+  char int_frac_digits;
+  char int_p_cs_precedes;
+  char int_n_cs_precedes;
+  char int_p_sep_by_space;
+  char int_n_sep_by_space;
+  char int_p_sign_posn;
+  char int_n_sign_posn;
+};
+
+#endif // LLVM_LIBC_TYPES_LCONV_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_msghdr.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_msghdr.h
new file mode 100644
index 000000000000..7933de190f34
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_msghdr.h
@@ -0,0 +1,26 @@
+//===-- Definition of struct msghdr ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_MSGHDR_H
+#define LLVM_LIBC_TYPES_STRUCT_MSGHDR_H
+
+#include "size_t.h"
+#include "socklen_t.h"
+#include "struct_iovec.h"
+
+struct msghdr {
+  void *msg_name;        /* Optional address */
+  socklen_t msg_namelen; /* Size of address */
+  struct iovec *msg_iov; /* Scatter/gather array */
+  size_t msg_iovlen;     /* # elements in msg_iov */
+  void *msg_control;     /* Ancillary data, see below */
+  size_t msg_controllen; /* Ancillary data buffer len */
+  int msg_flags;         /* Flags (unused) */
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_MSGHDR_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_pollfd.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_pollfd.h
new file mode 100644
index 000000000000..80abc8e76efc
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_pollfd.h
@@ -0,0 +1,18 @@
+//===-- Definition of type struct pollfd ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_POLLFD_H
+#define LLVM_LIBC_TYPES_STRUCT_POLLFD_H
+
+struct pollfd {
+  int fd;
+  short events;
+  short revents;
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_POLLFD_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_rlimit.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_rlimit.h
new file mode 100644
index 000000000000..15d8c0e16a64
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_rlimit.h
@@ -0,0 +1,19 @@
+//===-- Definition of type struct rlimit ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_RLIMIT_H
+#define LLVM_LIBC_TYPES_STRUCT_RLIMIT_H
+
+#include "rlim_t.h"
+
+struct rlimit {
+  rlim_t rlim_cur;
+  rlim_t rlim_max;
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_RLIMIT_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_rusage.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_rusage.h
new file mode 100644
index 000000000000..59fe9f7c1d2b
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_rusage.h
@@ -0,0 +1,37 @@
+//===-- Definition of type struct rusage ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_RUSAGE_H
+#define LLVM_LIBC_TYPES_STRUCT_RUSAGE_H
+
+#include "struct_timeval.h"
+
+struct rusage {
+  struct timeval ru_utime;
+  struct timeval ru_stime;
+#ifdef __linux__
+  // Following fields are linux extensions as expected by the
+  // linux syscalls.
+  long ru_maxrss;   // Maximum resident set size
+  long ru_ixrss;    // Integral shared memory size
+  long ru_idrss;    // Integral unshared data size
+  long ru_isrss;    // Integral unshared stack size
+  long ru_minflt;   // Page reclaims
+  long ru_majflt;   // Page faults
+  long ru_nswap;    // Swaps
+  long ru_inblock;  // Block input operations
+  long ru_oublock;  // Block output operations
+  long ru_msgsnd;   // Messages sent
+  long ru_msgrcv;   // Messages received
+  long ru_nsignals; // Signals received
+  long ru_nvcsw;    // Voluntary context switches
+  long ru_nivcsw;   // Involuntary context switches
+#endif
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_RUSAGE_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_sched_param.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_sched_param.h
new file mode 100644
index 000000000000..e44a00bc0e87
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_sched_param.h
@@ -0,0 +1,21 @@
+//===-- Definition of type struct sched_param -----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_SCHED_PARAM_H
+#define LLVM_LIBC_TYPES_STRUCT_SCHED_PARAM_H
+
+#include "pid_t.h"
+#include "struct_timespec.h"
+#include "time_t.h"
+
+struct sched_param {
+  // Process or thread execution scheduling priority.
+  int sched_priority;
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_SCHED_PARAM_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_sigaction.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_sigaction.h
new file mode 100644
index 000000000000..907418b5e0f9
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_sigaction.h
@@ -0,0 +1,28 @@
+//===-- Definition of struct __sigaction ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_SIGACTION_H
+#define LLVM_LIBC_TYPES_STRUCT_SIGACTION_H
+
+#include "siginfo_t.h"
+#include "sigset_t.h"
+
+struct sigaction {
+  union {
+    void (*sa_handler)(int);
+    void (*sa_sigaction)(int, siginfo_t *, void *);
+  };
+  sigset_t sa_mask;
+  int sa_flags;
+#ifdef __linux__
+  // This field is present on linux for most targets.
+  void (*sa_restorer)(void);
+#endif
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_SIGACTION_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_sockaddr.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_sockaddr.h
new file mode 100644
index 000000000000..b7579e9c6ba7
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_sockaddr.h
@@ -0,0 +1,21 @@
+//===-- Definition of struct sockaddr -------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_SOCKADDR_H
+#define LLVM_LIBC_TYPES_STRUCT_SOCKADDR_H
+
+#include "sa_family_t.h"
+
+struct sockaddr {
+  sa_family_t sa_family;
+  // sa_data is a variable length array. It is provided with a length of one
+  // here as a placeholder.
+  char sa_data[1];
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_SOCKADDR_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_sockaddr_un.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_sockaddr_un.h
new file mode 100644
index 000000000000..5ed31a49ebb5
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_sockaddr_un.h
@@ -0,0 +1,22 @@
+//===-- Definition of struct sockaddr_un ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_SOCKADDR_UN_H
+#define LLVM_LIBC_TYPES_STRUCT_SOCKADDR_UN_H
+
+#include "sa_family_t.h"
+
+// This is the sockaddr specialization for AF_UNIX or AF_LOCAL sockets, as
+// defined by posix.
+
+struct sockaddr_un {
+  sa_family_t sun_family; /* AF_UNIX */
+  char sun_path[108];     /* Pathname */
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_SOCKADDR_UN_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_stat.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_stat.h
new file mode 100644
index 000000000000..4026679f8d67
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_stat.h
@@ -0,0 +1,39 @@
+//===-- Definition of struct stat -----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_STAT_H
+#define LLVM_LIBC_TYPES_STRUCT_STAT_H
+
+#include "blkcnt_t.h"
+#include "blksize_t.h"
+#include "dev_t.h"
+#include "gid_t.h"
+#include "ino_t.h"
+#include "mode_t.h"
+#include "nlink_t.h"
+#include "off_t.h"
+#include "struct_timespec.h"
+#include "uid_t.h"
+
+struct stat {
+  dev_t st_dev;
+  ino_t st_ino;
+  mode_t st_mode;
+  nlink_t st_nlink;
+  uid_t st_uid;
+  gid_t st_gid;
+  dev_t st_rdev;
+  off_t st_size;
+  struct timespec st_atim;
+  struct timespec st_mtim;
+  struct timespec st_ctim;
+  blksize_t st_blksize;
+  blkcnt_t st_blocks;
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_STAT_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_statvfs.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_statvfs.h
new file mode 100644
index 000000000000..9c649af151ff
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_statvfs.h
@@ -0,0 +1,29 @@
+//===-- Definition of type struct statvfs ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_STATVFS_H
+#define LLVM_LIBC_TYPES_STRUCT_STATVFS_H
+
+#include "fsblkcnt_t.h"
+#include "fsfilcnt_t.h"
+
+struct statvfs {
+  unsigned long f_bsize;   /* Filesystem block size */
+  unsigned long f_frsize;  /* Fragment size */
+  fsblkcnt_t f_blocks;     /* Size of fs in f_frsize units */
+  fsblkcnt_t f_bfree;      /* Number of free blocks */
+  fsblkcnt_t f_bavail;     /* Number of free blocks for unprivileged users */
+  fsfilcnt_t f_files;      /* Number of inodes */
+  fsfilcnt_t f_ffree;      /* Number of free inodes */
+  fsfilcnt_t f_favail;     /* Number of free inodes for unprivileged users */
+  unsigned long f_fsid;    /* Filesystem ID */
+  unsigned long f_flag;    /* Mount flags */
+  unsigned long f_namemax; /* Maximum filename length */
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_STATVFS_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_termios.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_termios.h
new file mode 100644
index 000000000000..e3c5f2809e43
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_termios.h
@@ -0,0 +1,32 @@
+//===-- Definition of struct termios --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_LIBC_TYPES_STRUCT_TERMIOS_H__
+#define __LLVM_LIBC_TYPES_STRUCT_TERMIOS_H__
+
+#include "cc_t.h"
+#include "speed_t.h"
+#include "tcflag_t.h"
+
+struct termios {
+  tcflag_t c_iflag; // Input mode flags
+  tcflag_t c_oflag; // Output mode flags
+  tcflag_t c_cflag; // Control mode flags
+  tcflag_t c_lflag; // Local mode flags
+#ifdef __linux__
+  cc_t c_line; // Line discipline
+#endif         // __linux__
+  // NCCS is defined in llvm-libc-macros/termios-macros.h.
+  cc_t c_cc[NCCS]; // Control characters
+#ifdef __linux__
+  speed_t c_ispeed; // Input speed
+  speed_t c_ospeed; // output speed
+#endif              // __linux__
+};
+
+#endif // __LLVM_LIBC_TYPES_STRUCT_TERMIOS_H__
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_timespec.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_timespec.h
new file mode 100644
index 000000000000..28b5a571f679
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_timespec.h
@@ -0,0 +1,20 @@
+//===-- Definition of struct timespec -------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_TIMESPEC_H
+#define LLVM_LIBC_TYPES_STRUCT_TIMESPEC_H
+
+#include "time_t.h"
+
+struct timespec {
+  time_t tv_sec; /* Seconds.  */
+  /* TODO: BIG_ENDIAN may require padding. */
+  long tv_nsec; /* Nanoseconds.  */
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_TIMESPEC_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_timeval.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_timeval.h
new file mode 100644
index 000000000000..9595d85a46c8
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_timeval.h
@@ -0,0 +1,20 @@
+//===-- Definition of struct timeval -------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_TIMEVAL_H
+#define LLVM_LIBC_TYPES_STRUCT_TIMEVAL_H
+
+#include "suseconds_t.h"
+#include "time_t.h"
+
+struct timeval {
+  time_t tv_sec;       // Seconds
+  suseconds_t tv_usec; // Micro seconds
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_TIMEVAL_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_tm.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_tm.h
new file mode 100644
index 000000000000..2ec74ecac029
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_tm.h
@@ -0,0 +1,25 @@
+//===-- Definition of struct tm -------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_TM_H
+#define LLVM_LIBC_TYPES_STRUCT_TM_H
+
+struct tm {
+  int tm_sec;   // seconds after the minute
+  int tm_min;   // minutes after the hour
+  int tm_hour;  // hours since midnight
+  int tm_mday;  // day of the month
+  int tm_mon;   // months since January
+  int tm_year;  // years since 1900
+  int tm_wday;  // days since Sunday
+  int tm_yday;  // days since January
+  int tm_isdst; // Daylight Saving Time flag
+  // TODO: add tm_gmtoff and tm_zone? (posix extensions)
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_TM_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/struct_utsname.h b/contrib/llvm-project/libc/include/llvm-libc-types/struct_utsname.h
new file mode 100644
index 000000000000..e474171c7285
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/struct_utsname.h
@@ -0,0 +1,34 @@
+//===-- Definition of struct utsname --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_UTSNAME_H
+#define LLVM_LIBC_TYPES_STRUCT_UTSNAME_H
+
+#if defined(__linux__)
+#define __UTS_NAME_LENGTH 65
+#elif defined(__APPLE__)
+#define __UTS_NAME_LENGTH 256
+#else
+// Arbitray default. Should be specialized for each platform.
+#define __UTS_NAME_LENGTH 1024
+#endif
+
+struct utsname {
+  char sysname[__UTS_NAME_LENGTH];
+  char nodename[__UTS_NAME_LENGTH];
+  char release[__UTS_NAME_LENGTH];
+  char version[__UTS_NAME_LENGTH];
+  char machine[__UTS_NAME_LENGTH];
+#ifdef __linux__
+  char domainname[__UTS_NAME_LENGTH];
+#endif
+};
+
+#undef __UTS_NAME_LENGTH
+
+#endif // LLVM_LIBC_TYPES_STRUCT_UTSNAME_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/suseconds_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/suseconds_t.h
new file mode 100644
index 000000000000..8e926e8401f5
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/suseconds_t.h
@@ -0,0 +1,19 @@
+//===-- Definition of suseconds_t type ------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_SUSECONDS_T_H
+#define LLVM_LIBC_TYPES_SUSECONDS_T_H
+
+// Per posix: suseconds_t shall be a signed integer type capable of storing
+// values at least in the range [-1, 1000000]. [...] the widths of [other
+// types...] and suseconds_t are no greater than the width of type long.
+
+// The kernel expects 64 bit suseconds_t at least on x86_64.
+typedef long suseconds_t;
+
+#endif // LLVM_LIBC_TYPES_SUSECONDS_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/tcflag_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/tcflag_t.h
new file mode 100644
index 000000000000..2978487df434
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/tcflag_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of tcflag_t type ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_TCFLAG_T_H
+#define LLVM_LIBC_TYPES_TCFLAG_T_H
+
+typedef unsigned int tcflag_t;
+
+#endif // LLVM_LIBC_TYPES_TCFLAG_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/test_rpc_opcodes_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/test_rpc_opcodes_t.h
new file mode 100644
index 000000000000..7129768dc8b9
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/test_rpc_opcodes_t.h
@@ -0,0 +1,21 @@
+//===-- Definition of RPC opcodes used for internal tests -----------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_TEST_RPC_OPCODES_T_H
+#define LLVM_LIBC_TYPES_TEST_RPC_OPCODES_T_H
+
+// We consider the first 32768 opcodes as reserved for libc purposes. We allow
+// extensions to use any other number without conflicting with anything else.
+typedef enum : unsigned short {
+  RPC_TEST_NOOP = 1 << 15,
+  RPC_TEST_INCREMENT,
+  RPC_TEST_INTERFACE,
+  RPC_TEST_STREAM,
+} rpc_test_opcode_t;
+
+#endif // LLVM_LIBC_TYPES_TEST_RPC_OPCODES_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/thrd_start_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/thrd_start_t.h
new file mode 100644
index 000000000000..1fb21bccc036
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/thrd_start_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of thrd_start_t type -----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_THRD_START_T_H
+#define LLVM_LIBC_TYPES_THRD_START_T_H
+
+typedef int (*thrd_start_t)(void *);
+
+#endif // LLVM_LIBC_TYPES_THRD_START_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/thrd_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/thrd_t.h
new file mode 100644
index 000000000000..d5f31064f2fe
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/thrd_t.h
@@ -0,0 +1,16 @@
+//===-- Definition of thrd_t type -----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_THRD_T_H
+#define LLVM_LIBC_TYPES_THRD_T_H
+
+#include "__thread_type.h"
+
+typedef __thread_type thrd_t;
+
+#endif // LLVM_LIBC_TYPES_THRD_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/time_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/time_t.h
new file mode 100644
index 000000000000..76920dc07ec6
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/time_t.h
@@ -0,0 +1,18 @@
+//===-- Definition of the type time_t, for use during the libc build ------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_TIME_T_H
+#define LLVM_LIBC_TYPES_TIME_T_H
+
+#ifdef LIBC_TYPES_TIME_T_IS_32_BIT
+#include "time_t_32.h"
+#else
+#include "time_t_64.h"
+#endif
+
+#endif // LLVM_LIBC_TYPES_TIME_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/time_t_32.h b/contrib/llvm-project/libc/include/llvm-libc-types/time_t_32.h
new file mode 100644
index 000000000000..2c415f6fa9dc
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/time_t_32.h
@@ -0,0 +1,14 @@
+//===-- Definition of the type time_t -------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_TIME_T_32_H
+#define LLVM_LIBC_TYPES_TIME_T_32_H
+
+typedef __INT32_TYPE__ time_t;
+
+#endif // LLVM_LIBC_TYPES_TIME_T_32_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/time_t_64.h b/contrib/llvm-project/libc/include/llvm-libc-types/time_t_64.h
new file mode 100644
index 000000000000..8f7fd3233646
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/time_t_64.h
@@ -0,0 +1,14 @@
+//===-- Definition of the type time_t -------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_TIME_T_64_H
+#define LLVM_LIBC_TYPES_TIME_T_64_H
+
+typedef __INT64_TYPE__ time_t;
+
+#endif // LLVM_LIBC_TYPES_TIME_T_64_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/tss_dtor_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/tss_dtor_t.h
new file mode 100644
index 000000000000..c54b34e7d8b7
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/tss_dtor_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of the type tss_dtor_t ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_TSS_DTOR_T_H
+#define LLVM_LIBC_TYPES_TSS_DTOR_T_H
+
+typedef void (*tss_dtor_t)(void *);
+
+#endif // LLVM_LIBC_TYPES_TSS_DTOR_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/tss_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/tss_t.h
new file mode 100644
index 000000000000..92bc7ef451ca
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/tss_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of the type tss_t --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_TSS_T_H
+#define LLVM_LIBC_TYPES_TSS_T_H
+
+typedef unsigned int tss_t;
+
+#endif // LLVM_LIBC_TYPES_TSS_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/uid_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/uid_t.h
new file mode 100644
index 000000000000..4f6c6479186b
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/uid_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of uid_t type ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_UID_T_H
+#define LLVM_LIBC_TYPES_UID_T_H
+
+typedef __UINT32_TYPE__ uid_t;
+
+#endif // LLVM_LIBC_TYPES_UID_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/union_sigval.h b/contrib/llvm-project/libc/include/llvm-libc-types/union_sigval.h
new file mode 100644
index 000000000000..5f83cd220308
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/union_sigval.h
@@ -0,0 +1,17 @@
+//===-- Definition of type union sigval -----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_UNION_SIGVAL_H
+#define LLVM_LIBC_TYPES_UNION_SIGVAL_H
+
+union sigval {
+  int sival_int;
+  void *sival_ptr;
+};
+
+#endif // LLVM_LIBC_TYPES_UNION_SIGVAL_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/wchar_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/wchar_t.h
new file mode 100644
index 000000000000..bf2633a1c244
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/wchar_t.h
@@ -0,0 +1,19 @@
+//===-- Definition of wchar_t types ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_WCHAR_T_H
+#define LLVM_LIBC_TYPES_WCHAR_T_H
+
+// wchar_t is a fundamental type in C++.
+#ifndef __cplusplus
+
+typedef __WCHAR_TYPE__ wchar_t;
+
+#endif
+
+#endif // LLVM_LIBC_TYPES_WCHAR_T_H
diff --git a/contrib/llvm-project/libc/include/llvm-libc-types/wint_t.h b/contrib/llvm-project/libc/include/llvm-libc-types/wint_t.h
new file mode 100644
index 000000000000..a53c6e3cb622
--- /dev/null
+++ b/contrib/llvm-project/libc/include/llvm-libc-types/wint_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of wint_t types ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_WINT_T_H
+#define LLVM_LIBC_TYPES_WINT_T_H
+
+typedef __WINT_TYPE__ wint_t;
+
+#endif // LLVM_LIBC_TYPES_WINT_T_H
diff --git a/contrib/llvm-project/libc/include/sys/queue.h b/contrib/llvm-project/libc/include/sys/queue.h
new file mode 100644
index 000000000000..fc739b4a253b
--- /dev/null
+++ b/contrib/llvm-project/libc/include/sys/queue.h
@@ -0,0 +1,14 @@
+//===-- BSD sys/queue.h ---------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SYS_QUEUE_H
+#define SYS_QUEUE_H
+
+#include "../llvm-libc-macros/sys-queue-macros.h"
+
+#endif // SYS_QUEUE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/README.md b/contrib/llvm-project/libc/src/__support/CPP/README.md
new file mode 100644
index 000000000000..b470c3f1dc34
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/README.md
@@ -0,0 +1,13 @@
+This directory contains partial re-implementations of some C++ standard library
+utilities. They are for use with internal LLVM libc code and tests.
+
+More utilities can be added on an as needed basis. There are certain rules to
+be followed for future changes and additions:
+
+1. Only two kind of headers can be included: Other headers from this directory,
+and free standing C headers.
+2. Free standing C headers are to be included as C headers and not as C++
+headers. That is, use `#include <stddef.h>` and not `#include <cstddef>`.
+3. The utilities should be defined in the namespace `LIBC_NAMESPACE::cpp`. The
+higher level namespace should have a `__` prefix to avoid symbol name pollution
+when the utilities are used in implementation of public functions.
diff --git a/contrib/llvm-project/libc/src/__support/CPP/algorithm.h b/contrib/llvm-project/libc/src/__support/CPP/algorithm.h
new file mode 100644
index 000000000000..7704b3fa81f0
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/algorithm.h
@@ -0,0 +1,49 @@
+//===-- A self contained equivalent of <algorithm> --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// This file is minimalist on purpose but can receive a few more function if
+// they prove useful.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_ALGORITHM_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_ALGORITHM_H
+
+#include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+template <class T> LIBC_INLINE constexpr const T &max(const T &a, const T &b) {
+  return (a < b) ? b : a;
+}
+
+template <class T> LIBC_INLINE constexpr const T &min(const T &a, const T &b) {
+  return (a < b) ? a : b;
+}
+
+template <class T> LIBC_INLINE constexpr T abs(T a) { return a < 0 ? -a : a; }
+
+template <class InputIt, class UnaryPred>
+LIBC_INLINE constexpr InputIt find_if_not(InputIt first, InputIt last,
+                                          UnaryPred q) {
+  for (; first != last; ++first)
+    if (!q(*first))
+      return first;
+
+  return last;
+}
+
+template <class InputIt, class UnaryPred>
+LIBC_INLINE constexpr bool all_of(InputIt first, InputIt last, UnaryPred p) {
+  return find_if_not(first, last, p) == last;
+}
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_ALGORITHM_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/array.h b/contrib/llvm-project/libc/src/__support/CPP/array.h
new file mode 100644
index 000000000000..db0a986b7120
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/array.h
@@ -0,0 +1,80 @@
+//===-- A self contained equivalent of std::array ---------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_ARRAY_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_ARRAY_H
+
+#include "src/__support/CPP/iterator.h" // reverse_iterator
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#include <stddef.h> // For size_t.
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+template <class T, size_t N> struct array {
+  static_assert(N != 0,
+                "Cannot create a LIBC_NAMESPACE::cpp::array of size 0.");
+
+  T Data[N];
+  using value_type = T;
+  using iterator = T *;
+  using const_iterator = const T *;
+  using reverse_iterator = cpp::reverse_iterator<iterator>;
+  using const_reverse_iterator = cpp::reverse_iterator<const_iterator>;
+
+  LIBC_INLINE constexpr T *data() { return Data; }
+  LIBC_INLINE constexpr const T *data() const { return Data; }
+
+  LIBC_INLINE constexpr T &front() { return Data[0]; }
+  LIBC_INLINE constexpr const T &front() const { return Data[0]; }
+
+  LIBC_INLINE constexpr T &back() { return Data[N - 1]; }
+  LIBC_INLINE constexpr const T &back() const { return Data[N - 1]; }
+
+  LIBC_INLINE constexpr T &operator[](size_t Index) { return Data[Index]; }
+
+  LIBC_INLINE constexpr const T &operator[](size_t Index) const {
+    return Data[Index];
+  }
+
+  LIBC_INLINE constexpr size_t size() const { return N; }
+
+  LIBC_INLINE constexpr bool empty() const { return N == 0; }
+
+  LIBC_INLINE constexpr iterator begin() { return Data; }
+  LIBC_INLINE constexpr const_iterator begin() const { return Data; }
+  LIBC_INLINE constexpr const_iterator cbegin() const { return begin(); }
+
+  LIBC_INLINE constexpr iterator end() { return Data + N; }
+  LIBC_INLINE constexpr const_iterator end() const { return Data + N; }
+  LIBC_INLINE constexpr const_iterator cend() const { return end(); }
+
+  LIBC_INLINE constexpr reverse_iterator rbegin() {
+    return reverse_iterator{end()};
+  }
+  LIBC_INLINE constexpr const_reverse_iterator rbegin() const {
+    return const_reverse_iterator{end()};
+  }
+  LIBC_INLINE constexpr const_reverse_iterator crbegin() const {
+    return rbegin();
+  }
+
+  LIBC_INLINE constexpr reverse_iterator rend() {
+    return reverse_iterator{begin()};
+  }
+  LIBC_INLINE constexpr const_reverse_iterator rend() const {
+    return const_reverse_iterator{begin()};
+  }
+  LIBC_INLINE constexpr const_reverse_iterator crend() const { return rend(); }
+};
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_ARRAY_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/atomic.h b/contrib/llvm-project/libc/src/__support/CPP/atomic.h
new file mode 100644
index 000000000000..53b583c04ba1
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/atomic.h
@@ -0,0 +1,430 @@
+//===-- A simple equivalent of std::atomic ----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_ATOMIC_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_ATOMIC_H
+
+#include "src/__support/CPP/type_traits/has_unique_object_representations.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+
+#include "type_traits.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+enum class MemoryOrder : int {
+  RELAXED = __ATOMIC_RELAXED,
+  CONSUME = __ATOMIC_CONSUME,
+  ACQUIRE = __ATOMIC_ACQUIRE,
+  RELEASE = __ATOMIC_RELEASE,
+  ACQ_REL = __ATOMIC_ACQ_REL,
+  SEQ_CST = __ATOMIC_SEQ_CST
+};
+
+// These are a clang extension, see the clang documentation for more
+// information:
+// https://clang.llvm.org/docs/LanguageExtensions.html#scoped-atomic-builtins.
+enum class MemoryScope : int {
+#if defined(__MEMORY_SCOPE_SYSTEM) && defined(__MEMORY_SCOPE_DEVICE)
+  SYSTEM = __MEMORY_SCOPE_SYSTEM,
+  DEVICE = __MEMORY_SCOPE_DEVICE,
+#else
+  SYSTEM = 0,
+  DEVICE = 0,
+#endif
+};
+
+namespace impl {
+LIBC_INLINE constexpr int order(MemoryOrder mem_ord) {
+  return static_cast<int>(mem_ord);
+}
+
+LIBC_INLINE constexpr int scope(MemoryScope mem_scope) {
+  return static_cast<int>(mem_scope);
+}
+
+template <class T> LIBC_INLINE T *addressof(T &ref) {
+  return __builtin_addressof(ref);
+}
+
+LIBC_INLINE constexpr int infer_failure_order(MemoryOrder mem_ord) {
+  if (mem_ord == MemoryOrder::RELEASE)
+    return order(MemoryOrder::RELAXED);
+  if (mem_ord == MemoryOrder::ACQ_REL)
+    return order(MemoryOrder::ACQUIRE);
+  return order(mem_ord);
+}
+} // namespace impl
+
+template <typename T> struct Atomic {
+  static_assert(is_trivially_copyable_v<T> && is_copy_constructible_v<T> &&
+                    is_move_constructible_v<T> && is_copy_assignable_v<T> &&
+                    is_move_assignable_v<T>,
+                "atomic<T> requires T to be trivially copyable, copy "
+                "constructible, move constructible, copy assignable, "
+                "and move assignable.");
+
+  static_assert(cpp::has_unique_object_representations_v<T>,
+                "atomic<T> in libc only support types whose values has unique "
+                "object representations.");
+
+private:
+  // type conversion helper to avoid long c++ style casts
+
+  // Require types that are 1, 2, 4, 8, or 16 bytes in length to be aligned to
+  // at least their size to be potentially used lock-free.
+  LIBC_INLINE_VAR static constexpr size_t MIN_ALIGNMENT =
+      (sizeof(T) & (sizeof(T) - 1)) || (sizeof(T) > 16) ? 0 : sizeof(T);
+
+  LIBC_INLINE_VAR static constexpr size_t ALIGNMENT = alignof(T) > MIN_ALIGNMENT
+                                                          ? alignof(T)
+                                                          : MIN_ALIGNMENT;
+
+public:
+  using value_type = T;
+
+  // We keep the internal value public so that it can be addressable.
+  // This is useful in places like the Linux futex operations where
+  // we need pointers to the memory of the atomic values. Load and store
+  // operations should be performed using the atomic methods however.
+  alignas(ALIGNMENT) value_type val;
+
+  LIBC_INLINE constexpr Atomic() = default;
+
+  // Initializes the value without using atomic operations.
+  LIBC_INLINE constexpr Atomic(value_type v) : val(v) {}
+
+  LIBC_INLINE Atomic(const Atomic &) = delete;
+  LIBC_INLINE Atomic &operator=(const Atomic &) = delete;
+
+  // Atomic load.
+  LIBC_INLINE operator T() { return load(); }
+
+  LIBC_INLINE T
+  load(MemoryOrder mem_ord = MemoryOrder::SEQ_CST,
+       [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) {
+    T res;
+#if __has_builtin(__scoped_atomic_load)
+    __scoped_atomic_load(impl::addressof(val), impl::addressof(res),
+                         impl::order(mem_ord), impl::scope(mem_scope));
+#else
+    __atomic_load(impl::addressof(val), impl::addressof(res),
+                  impl::order(mem_ord));
+#endif
+    return res;
+  }
+
+  // Atomic store.
+  LIBC_INLINE T operator=(T rhs) {
+    store(rhs);
+    return rhs;
+  }
+
+  LIBC_INLINE void
+  store(T rhs, MemoryOrder mem_ord = MemoryOrder::SEQ_CST,
+        [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) {
+#if __has_builtin(__scoped_atomic_store)
+    __scoped_atomic_store(impl::addressof(val), impl::addressof(rhs),
+                          impl::order(mem_ord), impl::scope(mem_scope));
+#else
+    __atomic_store(impl::addressof(val), impl::addressof(rhs),
+                   impl::order(mem_ord));
+#endif
+  }
+
+  // Atomic compare exchange
+  LIBC_INLINE bool compare_exchange_strong(
+      T &expected, T desired, MemoryOrder mem_ord = MemoryOrder::SEQ_CST,
+      [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) {
+    return __atomic_compare_exchange(
+        impl::addressof(val), impl::addressof(expected),
+        impl::addressof(desired), false, impl::order(mem_ord),
+        impl::infer_failure_order(mem_ord));
+  }
+
+  // Atomic compare exchange (separate success and failure memory orders)
+  LIBC_INLINE bool compare_exchange_strong(
+      T &expected, T desired, MemoryOrder success_order,
+      MemoryOrder failure_order,
+      [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) {
+    return __atomic_compare_exchange(
+        impl::addressof(val), impl::addressof(expected),
+        impl::addressof(desired), false, impl::order(success_order),
+        impl::order(failure_order));
+  }
+
+  // Atomic compare exchange (weak version)
+  LIBC_INLINE bool compare_exchange_weak(
+      T &expected, T desired, MemoryOrder mem_ord = MemoryOrder::SEQ_CST,
+      [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) {
+    return __atomic_compare_exchange(
+        impl::addressof(val), impl::addressof(expected),
+        impl::addressof(desired), true, impl::order(mem_ord),
+        impl::infer_failure_order(mem_ord));
+  }
+
+  // Atomic compare exchange (weak version with separate success and failure
+  // memory orders)
+  LIBC_INLINE bool compare_exchange_weak(
+      T &expected, T desired, MemoryOrder success_order,
+      MemoryOrder failure_order,
+      [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) {
+    return __atomic_compare_exchange(
+        impl::addressof(val), impl::addressof(expected),
+        impl::addressof(desired), true, impl::order(success_order),
+        impl::order(failure_order));
+  }
+
+  LIBC_INLINE T
+  exchange(T desired, MemoryOrder mem_ord = MemoryOrder::SEQ_CST,
+           [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) {
+    T ret;
+#if __has_builtin(__scoped_atomic_exchange)
+    __scoped_atomic_exchange(impl::addressof(val), impl::addressof(desired),
+                             impl::addressof(ret), impl::order(mem_ord),
+                             impl::scope(mem_scope));
+#else
+    __atomic_exchange(impl::addressof(val), impl::addressof(desired),
+                      impl::addressof(ret), impl::order(mem_ord));
+#endif
+    return ret;
+  }
+
+  LIBC_INLINE T
+  fetch_add(T increment, MemoryOrder mem_ord = MemoryOrder::SEQ_CST,
+            [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) {
+    static_assert(cpp::is_integral_v<T>, "T must be an integral type.");
+#if __has_builtin(__scoped_atomic_fetch_add)
+    return __scoped_atomic_fetch_add(impl::addressof(val), increment,
+                                     impl::order(mem_ord),
+                                     impl::scope(mem_scope));
+#else
+    return __atomic_fetch_add(impl::addressof(val), increment,
+                              impl::order(mem_ord));
+#endif
+  }
+
+  LIBC_INLINE T
+  fetch_or(T mask, MemoryOrder mem_ord = MemoryOrder::SEQ_CST,
+           [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) {
+    static_assert(cpp::is_integral_v<T>, "T must be an integral type.");
+#if __has_builtin(__scoped_atomic_fetch_or)
+    return __scoped_atomic_fetch_or(impl::addressof(val), mask,
+                                    impl::order(mem_ord),
+                                    impl::scope(mem_scope));
+#else
+    return __atomic_fetch_or(impl::addressof(val), mask, impl::order(mem_ord));
+#endif
+  }
+
+  LIBC_INLINE T
+  fetch_and(T mask, MemoryOrder mem_ord = MemoryOrder::SEQ_CST,
+            [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) {
+    static_assert(cpp::is_integral_v<T>, "T must be an integral type.");
+#if __has_builtin(__scoped_atomic_fetch_and)
+    return __scoped_atomic_fetch_and(impl::addressof(val), mask,
+                                     impl::order(mem_ord),
+                                     impl::scope(mem_scope));
+#else
+    return __atomic_fetch_and(impl::addressof(val), mask, impl::order(mem_ord));
+#endif
+  }
+
+  LIBC_INLINE T
+  fetch_sub(T decrement, MemoryOrder mem_ord = MemoryOrder::SEQ_CST,
+            [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) {
+    static_assert(cpp::is_integral_v<T>, "T must be an integral type.");
+#if __has_builtin(__scoped_atomic_fetch_sub)
+    return __scoped_atomic_fetch_sub(impl::addressof(val), decrement,
+                                     impl::order(mem_ord),
+                                     impl::scope(mem_scope));
+#else
+    return __atomic_fetch_sub(impl::addressof(val), decrement,
+                              impl::order(mem_ord));
+#endif
+  }
+
+  // Set the value without using an atomic operation. This is useful
+  // in initializing atomic values without a constructor.
+  LIBC_INLINE void set(T rhs) { val = rhs; }
+};
+
+template <typename T> struct AtomicRef {
+  static_assert(is_trivially_copyable_v<T> && is_copy_constructible_v<T> &&
+                    is_move_constructible_v<T> && is_copy_assignable_v<T> &&
+                    is_move_assignable_v<T>,
+                "AtomicRef<T> requires T to be trivially copyable, copy "
+                "constructible, move constructible, copy assignable, "
+                "and move assignable.");
+
+  static_assert(cpp::has_unique_object_representations_v<T>,
+                "AtomicRef<T> only supports types with unique object "
+                "representations.");
+
+private:
+  T *ptr;
+
+public:
+  // Constructor from T reference
+  LIBC_INLINE explicit constexpr AtomicRef(T &obj) : ptr(&obj) {}
+
+  // Non-standard Implicit conversion from T*
+  LIBC_INLINE constexpr AtomicRef(T *obj) : ptr(obj) {}
+
+  LIBC_INLINE AtomicRef(const AtomicRef &) = default;
+  LIBC_INLINE AtomicRef &operator=(const AtomicRef &) = default;
+
+  // Atomic load
+  LIBC_INLINE operator T() const { return load(); }
+
+  LIBC_INLINE T
+  load(MemoryOrder mem_ord = MemoryOrder::SEQ_CST,
+       [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) const {
+    T res;
+#if __has_builtin(__scoped_atomic_load)
+    __scoped_atomic_load(ptr, &res, impl::order(mem_ord),
+                         impl::scope(mem_scope));
+#else
+    __atomic_load(ptr, &res, impl::order(mem_ord));
+#endif
+    return res;
+  }
+
+  // Atomic store
+  LIBC_INLINE T operator=(T rhs) const {
+    store(rhs);
+    return rhs;
+  }
+
+  LIBC_INLINE void
+  store(T rhs, MemoryOrder mem_ord = MemoryOrder::SEQ_CST,
+        [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) const {
+#if __has_builtin(__scoped_atomic_store)
+    __scoped_atomic_store(ptr, &rhs, impl::order(mem_ord),
+                          impl::scope(mem_scope));
+#else
+    __atomic_store(ptr, &rhs, impl::order(mem_ord));
+#endif
+  }
+
+  // Atomic compare exchange (strong)
+  LIBC_INLINE bool compare_exchange_strong(
+      T &expected, T desired, MemoryOrder mem_ord = MemoryOrder::SEQ_CST,
+      [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) const {
+    return __atomic_compare_exchange(ptr, &expected, &desired, false,
+                                     impl::order(mem_ord),
+                                     impl::infer_failure_order(mem_ord));
+  }
+
+  // Atomic compare exchange (strong, separate success/failure memory orders)
+  LIBC_INLINE bool compare_exchange_strong(
+      T &expected, T desired, MemoryOrder success_order,
+      MemoryOrder failure_order,
+      [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) const {
+    return __atomic_compare_exchange(ptr, &expected, &desired, false,
+                                     impl::order(success_order),
+                                     impl::order(failure_order));
+  }
+
+  // Atomic exchange
+  LIBC_INLINE T
+  exchange(T desired, MemoryOrder mem_ord = MemoryOrder::SEQ_CST,
+           [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) const {
+    T ret;
+#if __has_builtin(__scoped_atomic_exchange)
+    __scoped_atomic_exchange(ptr, &desired, &ret, impl::order(mem_ord),
+                             impl::scope(mem_scope));
+#else
+    __atomic_exchange(ptr, &desired, &ret, impl::order(mem_ord));
+#endif
+    return ret;
+  }
+
+  LIBC_INLINE T fetch_add(
+      T increment, MemoryOrder mem_ord = MemoryOrder::SEQ_CST,
+      [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) const {
+    static_assert(cpp::is_integral_v<T>, "T must be an integral type.");
+#if __has_builtin(__scoped_atomic_fetch_add)
+    return __scoped_atomic_fetch_add(ptr, increment, impl::order(mem_ord),
+                                     impl::scope(mem_scope));
+#else
+    return __atomic_fetch_add(ptr, increment, impl::order(mem_ord));
+#endif
+  }
+
+  LIBC_INLINE T
+  fetch_or(T mask, MemoryOrder mem_ord = MemoryOrder::SEQ_CST,
+           [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) const {
+    static_assert(cpp::is_integral_v<T>, "T must be an integral type.");
+#if __has_builtin(__scoped_atomic_fetch_or)
+    return __scoped_atomic_fetch_or(ptr, mask, impl::order(mem_ord),
+                                    impl::scope(mem_scope));
+#else
+    return __atomic_fetch_or(ptr, mask, impl::order(mem_ord));
+#endif
+  }
+
+  LIBC_INLINE T fetch_and(
+      T mask, MemoryOrder mem_ord = MemoryOrder::SEQ_CST,
+      [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) const {
+    static_assert(cpp::is_integral_v<T>, "T must be an integral type.");
+#if __has_builtin(__scoped_atomic_fetch_and)
+    return __scoped_atomic_fetch_and(ptr, mask, impl::order(mem_ord),
+                                     impl::scope(mem_scope));
+#else
+    return __atomic_fetch_and(ptr, mask, impl::order(mem_ord));
+#endif
+  }
+
+  LIBC_INLINE T fetch_sub(
+      T decrement, MemoryOrder mem_ord = MemoryOrder::SEQ_CST,
+      [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) const {
+    static_assert(cpp::is_integral_v<T>, "T must be an integral type.");
+#if __has_builtin(__scoped_atomic_fetch_sub)
+    return __scoped_atomic_fetch_sub(ptr, decrement, impl::order(mem_ord),
+                                     impl::scope(mem_scope));
+#else
+    return __atomic_fetch_sub(ptr, decrement, impl::order(mem_ord));
+#endif
+  }
+};
+
+// Permit CTAD when generating an atomic reference.
+template <typename T> AtomicRef(T &) -> AtomicRef<T>;
+
+// Issue a thread fence with the given memory ordering.
+LIBC_INLINE void atomic_thread_fence(
+    MemoryOrder mem_ord,
+    [[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) {
+#if __has_builtin(__scoped_atomic_thread_fence)
+  __scoped_atomic_thread_fence(static_cast<int>(mem_ord),
+                               static_cast<int>(mem_scope));
+#else
+  __atomic_thread_fence(static_cast<int>(mem_ord));
+#endif
+}
+
+// Establishes memory synchronization ordering of non-atomic and relaxed atomic
+// accesses, as instructed by order, between a thread and a signal handler
+// executed on the same thread. This is equivalent to atomic_thread_fence,
+// except no instructions for memory ordering are issued. Only reordering of
+// the instructions by the compiler is suppressed as order instructs.
+LIBC_INLINE void atomic_signal_fence([[maybe_unused]] MemoryOrder mem_ord) {
+#if __has_builtin(__atomic_signal_fence)
+  __atomic_signal_fence(static_cast<int>(mem_ord));
+#else
+  // if the builtin is not ready, use asm as a full compiler barrier.
+  asm volatile("" ::: "memory");
+#endif
+}
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_ATOMIC_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/bit.h b/contrib/llvm-project/libc/src/__support/CPP/bit.h
new file mode 100644
index 000000000000..e491f3e03266
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/bit.h
@@ -0,0 +1,298 @@
+//===-- Implementation of the C++20 bit header  -----------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// This is inspired by LLVM ADT/bit.h header.
+// Some functions are missing, we can add them as needed (popcount, byteswap).
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_BIT_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_BIT_H
+
+#include "src/__support/CPP/limits.h" // numeric_limits
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/sanitizer.h"
+
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+#if __has_builtin(__builtin_memcpy_inline)
+#define LLVM_LIBC_HAS_BUILTIN_MEMCPY_INLINE
+#endif
+
+// This implementation of bit_cast requires trivially-constructible To, to avoid
+// UB in the implementation.
+template <typename To, typename From>
+LIBC_INLINE constexpr cpp::enable_if_t<
+    (sizeof(To) == sizeof(From)) &&
+        cpp::is_trivially_constructible<To>::value &&
+        cpp::is_trivially_copyable<To>::value &&
+        cpp::is_trivially_copyable<From>::value,
+    To>
+bit_cast(const From &from) {
+  MSAN_UNPOISON(&from, sizeof(From));
+#if __has_builtin(__builtin_bit_cast)
+  return __builtin_bit_cast(To, from);
+#else
+  To to;
+  char *dst = reinterpret_cast<char *>(&to);
+  const char *src = reinterpret_cast<const char *>(&from);
+#if __has_builtin(__builtin_memcpy_inline)
+  __builtin_memcpy_inline(dst, src, sizeof(To));
+#else
+  for (unsigned i = 0; i < sizeof(To); ++i)
+    dst[i] = src[i];
+#endif // __has_builtin(__builtin_memcpy_inline)
+  return to;
+#endif // __has_builtin(__builtin_bit_cast)
+}
+
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>,
+                                                     bool>
+has_single_bit(T value) {
+  return (value != 0) && ((value & (value - 1)) == 0);
+}
+
+// A temporary macro to add template function specialization when compiler
+// builtin is available.
+#define ADD_SPECIALIZATION(NAME, TYPE, BUILTIN)                                \
+  template <> [[nodiscard]] LIBC_INLINE constexpr int NAME<TYPE>(TYPE value) { \
+    static_assert(cpp::is_unsigned_v<TYPE>);                                   \
+    return value == 0 ? cpp::numeric_limits<TYPE>::digits : BUILTIN(value);    \
+  }
+
+/// Count number of 0's from the least significant bit to the most
+///   stopping at the first 1.
+///
+/// Only unsigned integral types are allowed.
+///
+/// Returns cpp::numeric_limits<T>::digits on an input of 0.
+// clang-19+, gcc-14+
+#if __has_builtin(__builtin_ctzg)
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, int>
+countr_zero(T value) {
+  return __builtin_ctzg(value, cpp::numeric_limits<T>::digits);
+}
+#else
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, int>
+countr_zero(T value) {
+  if (!value)
+    return cpp::numeric_limits<T>::digits;
+  if (value & 0x1)
+    return 0;
+  // Bisection method.
+  unsigned zero_bits = 0;
+  unsigned shift = cpp::numeric_limits<T>::digits >> 1;
+  T mask = cpp::numeric_limits<T>::max() >> shift;
+  while (shift) {
+    if ((value & mask) == 0) {
+      value >>= shift;
+      zero_bits |= shift;
+    }
+    shift >>= 1;
+    mask >>= shift;
+  }
+  return static_cast<int>(zero_bits);
+}
+#if __has_builtin(__builtin_ctzs)
+ADD_SPECIALIZATION(countr_zero, unsigned short, __builtin_ctzs)
+#endif
+ADD_SPECIALIZATION(countr_zero, unsigned int, __builtin_ctz)
+ADD_SPECIALIZATION(countr_zero, unsigned long, __builtin_ctzl)
+ADD_SPECIALIZATION(countr_zero, unsigned long long, __builtin_ctzll)
+#endif // __has_builtin(__builtin_ctzg)
+
+/// Count number of 0's from the most significant bit to the least
+///   stopping at the first 1.
+///
+/// Only unsigned integral types are allowed.
+///
+/// Returns cpp::numeric_limits<T>::digits on an input of 0.
+// clang-19+, gcc-14+
+#if __has_builtin(__builtin_clzg)
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, int>
+countl_zero(T value) {
+  return __builtin_clzg(value, cpp::numeric_limits<T>::digits);
+}
+#else
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, int>
+countl_zero(T value) {
+  if (!value)
+    return cpp::numeric_limits<T>::digits;
+  // Bisection method.
+  unsigned zero_bits = 0;
+  for (unsigned shift = cpp::numeric_limits<T>::digits >> 1; shift;
+       shift >>= 1) {
+    T tmp = value >> shift;
+    if (tmp)
+      value = tmp;
+    else
+      zero_bits |= shift;
+  }
+  return static_cast<int>(zero_bits);
+}
+#if __has_builtin(__builtin_clzs)
+ADD_SPECIALIZATION(countl_zero, unsigned short, __builtin_clzs)
+#endif
+ADD_SPECIALIZATION(countl_zero, unsigned int, __builtin_clz)
+ADD_SPECIALIZATION(countl_zero, unsigned long, __builtin_clzl)
+ADD_SPECIALIZATION(countl_zero, unsigned long long, __builtin_clzll)
+#endif // __has_builtin(__builtin_clzg)
+
+#undef ADD_SPECIALIZATION
+
+/// Count the number of ones from the most significant bit to the first
+/// zero bit.
+///
+/// Ex. countl_one(0xFF0FFF00) == 8.
+/// Only unsigned integral types are allowed.
+///
+/// Returns cpp::numeric_limits<T>::digits on an input of all ones.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, int>
+countl_one(T value) {
+  return cpp::countl_zero<T>(static_cast<T>(~value));
+}
+
+/// Count the number of ones from the least significant bit to the first
+/// zero bit.
+///
+/// Ex. countr_one(0x00FF00FF) == 8.
+/// Only unsigned integral types are allowed.
+///
+/// Returns cpp::numeric_limits<T>::digits on an input of all ones.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, int>
+countr_one(T value) {
+  return cpp::countr_zero<T>(static_cast<T>(~value));
+}
+
+/// Returns the number of bits needed to represent value if value is nonzero.
+/// Returns 0 otherwise.
+///
+/// Ex. bit_width(5) == 3.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, int>
+bit_width(T value) {
+  return cpp::numeric_limits<T>::digits - cpp::countl_zero(value);
+}
+
+/// Returns the largest integral power of two no greater than value if value is
+/// nonzero.  Returns 0 otherwise.
+///
+/// Ex. bit_floor(5) == 4.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, T>
+bit_floor(T value) {
+  if (!value)
+    return 0;
+  return static_cast<T>(T(1) << (cpp::bit_width(value) - 1));
+}
+
+/// Returns the smallest integral power of two no smaller than value if value is
+/// nonzero.  Returns 1 otherwise.
+///
+/// Ex. bit_ceil(5) == 8.
+///
+/// The return value is undefined if the input is larger than the largest power
+/// of two representable in T.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, T>
+bit_ceil(T value) {
+  if (value < 2)
+    return 1;
+  return static_cast<T>(T(1) << cpp::bit_width(value - 1U));
+}
+
+// Rotate algorithms make use of "Safe, Efficient, and Portable Rotate in C/C++"
+// from https://blog.regehr.org/archives/1063.
+
+// Forward-declare rotr so that rotl can use it.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, T>
+rotr(T value, int rotate);
+
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, T>
+rotl(T value, int rotate) {
+  constexpr int N = cpp::numeric_limits<T>::digits;
+  rotate = rotate % N;
+  if (!rotate)
+    return value;
+  if (rotate < 0)
+    return cpp::rotr<T>(value, -rotate);
+  return static_cast<T>((value << rotate) | (value >> (N - rotate)));
+}
+
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, T>
+rotr(T value, int rotate) {
+  constexpr int N = cpp::numeric_limits<T>::digits;
+  rotate = rotate % N;
+  if (!rotate)
+    return value;
+  if (rotate < 0)
+    return cpp::rotl<T>(value, -rotate);
+  return static_cast<T>((value >> rotate) | (value << (N - rotate)));
+}
+
+// TODO: Do we need this function at all? How is it different from
+// 'static_cast'?
+template <class To, class From>
+LIBC_INLINE constexpr To bit_or_static_cast(const From &from) {
+  if constexpr (sizeof(To) == sizeof(From)) {
+    return bit_cast<To>(from);
+  } else {
+    return static_cast<To>(from);
+  }
+}
+
+/// Count number of 1's aka population count or Hamming weight.
+///
+/// Only unsigned integral types are allowed.
+// clang-19+, gcc-14+
+#if __has_builtin(__builtin_popcountg)
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, int>
+popcount(T value) {
+  return __builtin_popcountg(value);
+}
+#else // !__has_builtin(__builtin_popcountg)
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, int>
+popcount(T value) {
+  int count = 0;
+  while (value) {
+    value &= value - 1;
+    ++count;
+  }
+  return count;
+}
+#define ADD_SPECIALIZATION(TYPE, BUILTIN)                                      \
+  template <>                                                                  \
+  [[nodiscard]] LIBC_INLINE constexpr int popcount<TYPE>(TYPE value) {         \
+    return BUILTIN(value);                                                     \
+  }
+ADD_SPECIALIZATION(unsigned char, __builtin_popcount)
+ADD_SPECIALIZATION(unsigned short, __builtin_popcount)
+ADD_SPECIALIZATION(unsigned, __builtin_popcount)
+ADD_SPECIALIZATION(unsigned long, __builtin_popcountl)
+ADD_SPECIALIZATION(unsigned long long, __builtin_popcountll)
+#endif // __builtin_popcountg
+#undef ADD_SPECIALIZATION
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_BIT_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/bitset.h b/contrib/llvm-project/libc/src/__support/CPP/bitset.h
new file mode 100644
index 000000000000..db193f414abd
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/bitset.h
@@ -0,0 +1,94 @@
+//===-- A self contained equivalent of std::bitset --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_BITSET_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_BITSET_H
+
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#include <stddef.h> // For size_t.
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+template <size_t NumberOfBits> struct bitset {
+  static_assert(NumberOfBits != 0,
+                "Cannot create a LIBC_NAMESPACE::cpp::bitset of size 0.");
+
+  LIBC_INLINE constexpr void set(size_t Index) {
+    Data[Index / BITS_PER_UNIT] |= mask(Index);
+  }
+
+  LIBC_INLINE constexpr void reset() {
+    for (size_t i = 0; i < NUMBER_OF_UNITS; ++i)
+      Data[i] = 0;
+  }
+
+  LIBC_INLINE constexpr bool test(size_t Index) const {
+    return Data[Index / BITS_PER_UNIT] & mask(Index);
+  }
+
+  LIBC_INLINE constexpr void flip() {
+    for (size_t i = 0; i < NUMBER_OF_UNITS; ++i)
+      Data[i] = ~Data[i];
+  }
+
+  // This function sets all bits in the range from Start to End (inclusive) to
+  // true. It assumes that Start <= End.
+  LIBC_INLINE constexpr void set_range(size_t Start, size_t End) {
+    size_t start_index = Start / BITS_PER_UNIT;
+    size_t end_index = End / BITS_PER_UNIT;
+
+    if (start_index == end_index) {
+      // The reason the left shift is split into two parts (instead of just left
+      // shifting by End - Start + 1) is because when a number is shifted left
+      // by 64 then it wraps around to doing nothing, but shifting by 63 and the
+      // shifting by 1 correctly shifts away all of the bits.
+      size_t bit_mask = (((size_t(1) << (End - Start)) << 1) - 1)
+                        << (Start - (start_index * BITS_PER_UNIT));
+      Data[start_index] |= bit_mask;
+    } else {
+      size_t low_bit_mask =
+          ~((size_t(1) << (Start - (start_index * BITS_PER_UNIT))) - 1);
+      Data[start_index] |= low_bit_mask;
+
+      for (size_t i = start_index + 1; i < end_index; ++i)
+        Data[i] = ~size_t(0);
+
+      // Same as above, by splitting the shift the behavior is more consistent.
+      size_t high_bit_mask =
+          ((size_t(1) << (End - (end_index * BITS_PER_UNIT))) << 1) - 1;
+      Data[end_index] |= high_bit_mask;
+    }
+  }
+
+  LIBC_INLINE constexpr bool
+  operator==(const bitset<NumberOfBits> &other) const {
+    for (size_t i = 0; i < NUMBER_OF_UNITS; ++i) {
+      if (Data[i] != other.Data[i])
+        return false;
+    }
+    return true;
+  }
+
+private:
+  static constexpr size_t BITS_PER_BYTE = 8;
+  static constexpr size_t BITS_PER_UNIT = BITS_PER_BYTE * sizeof(size_t);
+  static constexpr size_t NUMBER_OF_UNITS =
+      (NumberOfBits + BITS_PER_UNIT - 1) / BITS_PER_UNIT;
+
+  LIBC_INLINE static constexpr size_t mask(size_t Index) {
+    return size_t{1} << (Index % BITS_PER_UNIT);
+  }
+  size_t Data[NUMBER_OF_UNITS] = {0};
+};
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_BITSET_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/cstddef.h b/contrib/llvm-project/libc/src/__support/CPP/cstddef.h
new file mode 100644
index 000000000000..ed6c9d03362f
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/cstddef.h
@@ -0,0 +1,74 @@
+//===-- A self contained equivalent of cstddef ------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_CSTDDEF_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_CSTDDEF_H
+
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#include "type_traits.h" // For enable_if_t, is_integral_v.
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+enum class byte : unsigned char {};
+
+template <class IntegerType>
+LIBC_INLINE constexpr enable_if_t<is_integral_v<IntegerType>, byte>
+operator>>(byte b, IntegerType shift) noexcept {
+  return static_cast<byte>(static_cast<unsigned char>(b) >> shift);
+}
+template <class IntegerType>
+LIBC_INLINE constexpr enable_if_t<is_integral_v<IntegerType>, byte &>
+operator>>=(byte &b, IntegerType shift) noexcept {
+  return b = b >> shift;
+}
+template <class IntegerType>
+LIBC_INLINE constexpr enable_if_t<is_integral_v<IntegerType>, byte>
+operator<<(byte b, IntegerType shift) noexcept {
+  return static_cast<byte>(static_cast<unsigned char>(b) << shift);
+}
+template <class IntegerType>
+LIBC_INLINE constexpr enable_if_t<is_integral_v<IntegerType>, byte &>
+operator<<=(byte &b, IntegerType shift) noexcept {
+  return b = b << shift;
+}
+LIBC_INLINE constexpr byte operator|(byte l, byte r) noexcept {
+  return static_cast<byte>(static_cast<unsigned char>(l) |
+                           static_cast<unsigned char>(r));
+}
+LIBC_INLINE constexpr byte &operator|=(byte &l, byte r) noexcept {
+  return l = l | r;
+}
+LIBC_INLINE constexpr byte operator&(byte l, byte r) noexcept {
+  return static_cast<byte>(static_cast<unsigned char>(l) &
+                           static_cast<unsigned char>(r));
+}
+LIBC_INLINE constexpr byte &operator&=(byte &l, byte r) noexcept {
+  return l = l & r;
+}
+LIBC_INLINE constexpr byte operator^(byte l, byte r) noexcept {
+  return static_cast<byte>(static_cast<unsigned char>(l) ^
+                           static_cast<unsigned char>(r));
+}
+LIBC_INLINE constexpr byte &operator^=(byte &l, byte r) noexcept {
+  return l = l ^ r;
+}
+LIBC_INLINE constexpr byte operator~(byte b) noexcept {
+  return static_cast<byte>(~static_cast<unsigned char>(b));
+}
+template <typename IntegerType>
+LIBC_INLINE constexpr enable_if_t<is_integral_v<IntegerType>, IntegerType>
+to_integer(byte b) noexcept {
+  return static_cast<IntegerType>(b);
+}
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_CSTDDEF_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/expected.h b/contrib/llvm-project/libc/src/__support/CPP/expected.h
new file mode 100644
index 000000000000..8a93091f0ebf
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/expected.h
@@ -0,0 +1,60 @@
+//===-- Holds an expected or unexpected value -------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_EXPECTED_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_EXPECTED_H
+
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// This is used to hold an unexpected value so that a different constructor is
+// selected.
+template <class T> class unexpected {
+  T value;
+
+public:
+  LIBC_INLINE constexpr explicit unexpected(T value) : value(value) {}
+  LIBC_INLINE constexpr T error() { return value; }
+};
+
+template <class T> explicit unexpected(T) -> unexpected<T>;
+
+template <class T, class E> class expected {
+  union {
+    T exp;
+    E unexp;
+  };
+  bool is_expected;
+
+public:
+  LIBC_INLINE constexpr expected(T exp) : exp(exp), is_expected(true) {}
+  LIBC_INLINE constexpr expected(unexpected<E> unexp)
+      : unexp(unexp.error()), is_expected(false) {}
+
+  LIBC_INLINE constexpr bool has_value() const { return is_expected; }
+
+  LIBC_INLINE constexpr T &value() { return exp; }
+  LIBC_INLINE constexpr E &error() { return unexp; }
+  LIBC_INLINE constexpr const T &value() const { return exp; }
+  LIBC_INLINE constexpr const E &error() const { return unexp; }
+
+  LIBC_INLINE constexpr operator bool() const { return is_expected; }
+
+  LIBC_INLINE constexpr T &operator*() { return exp; }
+  LIBC_INLINE constexpr const T &operator*() const { return exp; }
+  LIBC_INLINE constexpr T *operator->() { return &exp; }
+  LIBC_INLINE constexpr const T *operator->() const { return &exp; }
+};
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_EXPECTED_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/functional.h b/contrib/llvm-project/libc/src/__support/CPP/functional.h
new file mode 100644
index 000000000000..50cfa256b668
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/functional.h
@@ -0,0 +1,71 @@
+//===-- Self contained functional header ------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_FUNCTIONAL_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_FUNCTIONAL_H
+
+#include "src/__support/CPP/type_traits/enable_if.h"
+#include "src/__support/CPP/type_traits/is_convertible.h"
+#include "src/__support/CPP/type_traits/is_same.h"
+#include "src/__support/CPP/type_traits/is_void.h"
+#include "src/__support/CPP/type_traits/remove_cvref.h"
+#include "src/__support/CPP/type_traits/remove_reference.h"
+#include "src/__support/CPP/utility/forward.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+/// A function type adapted from LLVM's function_ref.
+/// This class does not own the callable, so it is not in general safe to
+/// store a function.
+template <typename Fn> class function;
+
+template <typename Ret, typename... Params> class function<Ret(Params...)> {
+  Ret (*callback)(intptr_t callable, Params... params) = nullptr;
+  intptr_t callable;
+
+  template <typename Callable>
+  LIBC_INLINE static Ret callback_fn(intptr_t callable, Params... params) {
+    return (*reinterpret_cast<Callable *>(callable))(
+        cpp::forward<Params>(params)...);
+  }
+
+public:
+  LIBC_INLINE function() = default;
+  LIBC_INLINE function(decltype(nullptr)) {}
+  LIBC_INLINE ~function() = default;
+
+  template <typename Callable>
+  LIBC_INLINE function(
+      Callable &&callable,
+      // This is not the copy-constructor.
+      enable_if_t<!cpp::is_same_v<remove_cvref_t<Callable>, function>> * =
+          nullptr,
+      // Functor must be callable and return a suitable type.
+      enable_if_t<cpp::is_void_v<Ret> ||
+                  cpp::is_convertible_v<
+                      decltype(declval<Callable>()(declval<Params>()...)), Ret>>
+          * = nullptr)
+      : callback(callback_fn<cpp::remove_reference_t<Callable>>),
+        callable(reinterpret_cast<intptr_t>(&callable)) {}
+
+  LIBC_INLINE Ret operator()(Params... params) const {
+    return callback(callable, cpp::forward<Params>(params)...);
+  }
+
+  LIBC_INLINE explicit operator bool() const { return callback; }
+};
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_FUNCTIONAL_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/iterator.h b/contrib/llvm-project/libc/src/__support/CPP/iterator.h
new file mode 100644
index 000000000000..168a26973182
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/iterator.h
@@ -0,0 +1,99 @@
+//===-- Standalone implementation of iterator -------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_ITERATOR_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_ITERATOR_H
+
+#include "src/__support/CPP/type_traits/enable_if.h"
+#include "src/__support/CPP/type_traits/is_convertible.h"
+#include "src/__support/CPP/type_traits/is_same.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+template <typename T> struct iterator_traits;
+template <typename T> struct iterator_traits<T *> {
+  using reference = T &;
+  using value_type = T;
+};
+
+template <typename Iter> class reverse_iterator {
+  Iter current;
+
+public:
+  using reference = typename iterator_traits<Iter>::reference;
+  using value_type = typename iterator_traits<Iter>::value_type;
+  using iterator_type = Iter;
+
+  LIBC_INLINE reverse_iterator() : current() {}
+  LIBC_INLINE constexpr explicit reverse_iterator(Iter it) : current(it) {}
+
+  template <typename Other,
+            cpp::enable_if_t<!cpp::is_same_v<Iter, Other> &&
+                                 cpp::is_convertible_v<const Other &, Iter>,
+                             int> = 0>
+  LIBC_INLINE constexpr explicit reverse_iterator(const Other &it)
+      : current(it) {}
+
+  LIBC_INLINE friend constexpr bool operator==(const reverse_iterator &lhs,
+                                               const reverse_iterator &rhs) {
+    return lhs.base() == rhs.base();
+  }
+
+  LIBC_INLINE friend constexpr bool operator!=(const reverse_iterator &lhs,
+                                               const reverse_iterator &rhs) {
+    return lhs.base() != rhs.base();
+  }
+
+  LIBC_INLINE friend constexpr bool operator<(const reverse_iterator &lhs,
+                                              const reverse_iterator &rhs) {
+    return lhs.base() > rhs.base();
+  }
+
+  LIBC_INLINE friend constexpr bool operator<=(const reverse_iterator &lhs,
+                                               const reverse_iterator &rhs) {
+    return lhs.base() >= rhs.base();
+  }
+
+  LIBC_INLINE friend constexpr bool operator>(const reverse_iterator &lhs,
+                                              const reverse_iterator &rhs) {
+    return lhs.base() < rhs.base();
+  }
+
+  LIBC_INLINE friend constexpr bool operator>=(const reverse_iterator &lhs,
+                                               const reverse_iterator &rhs) {
+    return lhs.base() <= rhs.base();
+  }
+
+  LIBC_INLINE constexpr iterator_type base() const { return current; }
+
+  LIBC_INLINE constexpr reference operator*() const {
+    Iter tmp = current;
+    return *--tmp;
+  }
+  LIBC_INLINE constexpr reverse_iterator operator--() {
+    ++current;
+    return *this;
+  }
+  LIBC_INLINE constexpr reverse_iterator &operator++() {
+    --current;
+    return *this;
+  }
+  LIBC_INLINE constexpr reverse_iterator operator++(int) {
+    reverse_iterator tmp(*this);
+    --current;
+    return tmp;
+  }
+};
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_ITERATOR_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/limits.h b/contrib/llvm-project/libc/src/__support/CPP/limits.h
new file mode 100644
index 000000000000..cf4beb9cc859
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/limits.h
@@ -0,0 +1,92 @@
+//===-- A self contained equivalent of std::limits --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_LIMITS_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_LIMITS_H
+
+#include "hdr/limits_macros.h" // CHAR_BIT
+#include "src/__support/CPP/type_traits/is_integral.h"
+#include "src/__support/CPP/type_traits/is_signed.h"
+#include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+namespace internal {
+
+template <typename T, T min_value, T max_value> struct integer_impl {
+  static_assert(cpp::is_integral_v<T>);
+  LIBC_INLINE static constexpr T max() { return max_value; }
+  LIBC_INLINE static constexpr T min() { return min_value; }
+  LIBC_INLINE_VAR static constexpr int digits =
+      CHAR_BIT * sizeof(T) - cpp::is_signed_v<T>;
+};
+
+} // namespace internal
+
+template <class T> struct numeric_limits {};
+
+// TODO: Add numeric_limits specializations as needed for new types.
+template <>
+struct numeric_limits<short>
+    : public internal::integer_impl<short, SHRT_MIN, SHRT_MAX> {};
+
+template <>
+struct numeric_limits<unsigned short>
+    : public internal::integer_impl<unsigned short, 0, USHRT_MAX> {};
+
+template <>
+struct numeric_limits<int>
+    : public internal::integer_impl<int, INT_MIN, INT_MAX> {};
+
+template <>
+struct numeric_limits<unsigned int>
+    : public internal::integer_impl<unsigned int, 0, UINT_MAX> {};
+
+template <>
+struct numeric_limits<long>
+    : public internal::integer_impl<long, LONG_MIN, LONG_MAX> {};
+
+template <>
+struct numeric_limits<unsigned long>
+    : public internal::integer_impl<unsigned long, 0, ULONG_MAX> {};
+
+template <>
+struct numeric_limits<long long>
+    : public internal::integer_impl<long long, LLONG_MIN, LLONG_MAX> {};
+
+template <>
+struct numeric_limits<unsigned long long>
+    : public internal::integer_impl<unsigned long long, 0, ULLONG_MAX> {};
+
+template <>
+struct numeric_limits<char>
+    : public internal::integer_impl<char, CHAR_MIN, CHAR_MAX> {};
+
+template <>
+struct numeric_limits<signed char>
+    : public internal::integer_impl<signed char, SCHAR_MIN, SCHAR_MAX> {};
+
+template <>
+struct numeric_limits<unsigned char>
+    : public internal::integer_impl<unsigned char, 0, UCHAR_MAX> {};
+
+#ifdef LIBC_TYPES_HAS_INT128
+// On platform where UInt128 resolves to __uint128_t, this specialization
+// provides the limits of UInt128.
+template <>
+struct numeric_limits<__uint128_t>
+    : public internal::integer_impl<__uint128_t, 0, ~__uint128_t(0)> {};
+#endif
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_LIMITS_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/mutex.h b/contrib/llvm-project/libc/src/__support/CPP/mutex.h
new file mode 100644
index 000000000000..8a3102426e2d
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/mutex.h
@@ -0,0 +1,51 @@
+//===--- A self contained equivalent of std::mutex --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_MUTEX_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_MUTEX_H
+
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// Assume the calling thread has already obtained mutex ownership.
+struct adopt_lock_t {
+  explicit adopt_lock_t() = default;
+};
+
+// Tag used to make a scoped lock take ownership of a locked mutex.
+constexpr adopt_lock_t adopt_lock{};
+
+// An RAII class for easy locking and unlocking of mutexes.
+template <typename MutexType> class lock_guard {
+  MutexType &mutex;
+
+public:
+  // Calls `m.lock()` upon resource acquisition.
+  explicit lock_guard(MutexType &m) : mutex(m) { mutex.lock(); }
+
+  // Acquires ownership of the mutex object `m` without attempting to lock
+  // it. The behavior is undefined if the current thread does not hold the
+  // lock on `m`. Does not call `m.lock()` upon resource acquisition.
+  lock_guard(MutexType &m, adopt_lock_t /* t */) : mutex(m) {}
+
+  ~lock_guard() { mutex.unlock(); }
+
+  // non-copyable
+  lock_guard &operator=(const lock_guard &) = delete;
+  lock_guard(const lock_guard &) = delete;
+};
+
+// Deduction guide for lock_guard to suppress CTAD warnings.
+template <typename T> lock_guard(T &) -> lock_guard<T>;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_MUTEX_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/new.cpp b/contrib/llvm-project/libc/src/__support/CPP/new.cpp
new file mode 100644
index 000000000000..65f80de37348
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/new.cpp
@@ -0,0 +1,44 @@
+//===-- Implementation of custom operator delete --------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "new.h"
+#include "hdr/func/free.h"
+
+void operator delete(void *mem) noexcept { ::free(mem); }
+
+void operator delete(void *mem, std::align_val_t) noexcept { ::free(mem); }
+
+void operator delete(void *mem, size_t) noexcept { ::free(mem); }
+
+void operator delete(void *mem, size_t, std::align_val_t) noexcept {
+#ifdef LIBC_TARGET_OS_IS_WINDOWS
+  ::_aligned_free(mem);
+#else
+  ::free(mem);
+#endif
+}
+
+void operator delete[](void *mem) noexcept { ::free(mem); }
+
+void operator delete[](void *mem, std::align_val_t) noexcept {
+#ifdef LIBC_TARGET_OS_IS_WINDOWS
+  ::_aligned_free(mem);
+#else
+  ::free(mem);
+#endif
+}
+
+void operator delete[](void *mem, size_t) noexcept { ::free(mem); }
+
+void operator delete[](void *mem, size_t, std::align_val_t) noexcept {
+#ifdef LIBC_TARGET_OS_IS_WINDOWS
+  ::_aligned_free(mem);
+#else
+  ::free(mem);
+#endif
+}
diff --git a/contrib/llvm-project/libc/src/__support/CPP/new.h b/contrib/llvm-project/libc/src/__support/CPP/new.h
new file mode 100644
index 000000000000..fe36de29468a
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/new.h
@@ -0,0 +1,130 @@
+//===-- Libc specific custom operator new and delete ------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_NEW_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_NEW_H
+
+#include "hdr/func/aligned_alloc.h"
+#include "hdr/func/free.h"
+#include "hdr/func/malloc.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/os.h"
+
+#include <stddef.h> // For size_t
+
+// Defining members in the std namespace is not preferred. But, we do it here
+// so that we can use it to define the operator new which takes std::align_val_t
+// argument.
+namespace std {
+
+enum class align_val_t : size_t {};
+
+} // namespace std
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace cpp {
+template <class T> [[nodiscard]] constexpr T *launder(T *p) {
+  static_assert(__has_builtin(__builtin_launder),
+                "cpp::launder requires __builtin_launder");
+  return __builtin_launder(p);
+}
+} // namespace cpp
+
+class AllocChecker {
+  bool success = false;
+
+  LIBC_INLINE AllocChecker &operator=(bool status) {
+    success = status;
+    return *this;
+  }
+
+public:
+  LIBC_INLINE AllocChecker() = default;
+
+  LIBC_INLINE operator bool() const { return success; }
+
+  LIBC_INLINE static void *alloc(size_t s, AllocChecker &ac) {
+    void *mem = ::malloc(s);
+    ac = (mem != nullptr);
+    return mem;
+  }
+
+  LIBC_INLINE static void *aligned_alloc(size_t s, std::align_val_t align,
+                                         AllocChecker &ac) {
+#ifdef LIBC_TARGET_OS_IS_WINDOWS
+    // std::aligned_alloc is not available on Windows because std::free on
+    // Windows cannot deallocate any over-aligned memory. Microsoft provides an
+    // alternative for std::aligned_alloc named _aligned_malloc, but it must be
+    // paired with _aligned_free instead of std::free.
+    void *mem = ::_aligned_malloc(static_cast<size_t>(align), s);
+#else
+    void *mem = ::aligned_alloc(static_cast<size_t>(align), s);
+#endif
+    ac = (mem != nullptr);
+    return mem;
+  }
+};
+
+} // namespace LIBC_NAMESPACE_DECL
+
+LIBC_INLINE void *operator new(size_t size,
+                               LIBC_NAMESPACE::AllocChecker &ac) noexcept {
+  return LIBC_NAMESPACE::AllocChecker::alloc(size, ac);
+}
+
+LIBC_INLINE void *operator new(size_t size, std::align_val_t align,
+                               LIBC_NAMESPACE::AllocChecker &ac) noexcept {
+  return LIBC_NAMESPACE::AllocChecker::aligned_alloc(size, align, ac);
+}
+
+LIBC_INLINE void *operator new[](size_t size,
+                                 LIBC_NAMESPACE::AllocChecker &ac) noexcept {
+  return LIBC_NAMESPACE::AllocChecker::alloc(size, ac);
+}
+
+LIBC_INLINE void *operator new[](size_t size, std::align_val_t align,
+                                 LIBC_NAMESPACE::AllocChecker &ac) noexcept {
+  return LIBC_NAMESPACE::AllocChecker::aligned_alloc(size, align, ac);
+}
+
+LIBC_INLINE void *operator new(size_t, void *p) { return p; }
+
+LIBC_INLINE void *operator new[](size_t, void *p) { return p; }
+
+// The ideal situation would be to define the various flavors of operator delete
+// inlinelike we do with operator new above. However, since we need operator
+// delete prototypes to match those specified by the C++ standard, we cannot
+// define them inline as the C++ standard does not allow inline definitions of
+// replacement operator delete implementations. Note also that we assign a
+// special linkage name to each of these replacement operator delete functions.
+// This is because, if we do not give them a special libc internal linkage name,
+// they will replace operator delete for the entire application. Including this
+// header file in all libc source files where operator delete is called ensures
+// that only libc call sites use these replacement operator delete functions.
+
+#define DELETE_NAME(name)                                                      \
+  __asm__(LIBC_MACRO_TO_STRING(LIBC_NAMESPACE) "_" LIBC_MACRO_TO_STRING(name))
+
+void operator delete(void *) noexcept DELETE_NAME(delete);
+void operator delete(void *, std::align_val_t) noexcept
+    DELETE_NAME(delete_aligned);
+void operator delete(void *, size_t) noexcept DELETE_NAME(delete_sized);
+void operator delete(void *, size_t, std::align_val_t) noexcept
+    DELETE_NAME(delete_sized_aligned);
+void operator delete[](void *) noexcept DELETE_NAME(delete_array);
+void operator delete[](void *, std::align_val_t) noexcept
+    DELETE_NAME(delete_array_aligned);
+void operator delete[](void *, size_t) noexcept DELETE_NAME(delete_array_sized);
+void operator delete[](void *, size_t, std::align_val_t) noexcept
+    DELETE_NAME(delete_array_sized_aligned);
+
+#undef DELETE_NAME
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_NEW_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/optional.h b/contrib/llvm-project/libc/src/__support/CPP/optional.h
new file mode 100644
index 000000000000..aed2269db1b1
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/optional.h
@@ -0,0 +1,139 @@
+//===-- Standalone implementation of std::optional --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_OPTIONAL_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_OPTIONAL_H
+
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/CPP/utility.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// Trivial nullopt_t struct.
+struct nullopt_t {
+  LIBC_INLINE constexpr explicit nullopt_t() = default;
+};
+
+// nullopt that can be used and returned.
+LIBC_INLINE_VAR constexpr nullopt_t nullopt{};
+
+// This is very simple implementation of the std::optional class. It makes
+// several assumptions that the underlying type is trivially constructible,
+// copyable, or movable.
+template <typename T> class optional {
+  template <typename U, bool = !is_trivially_destructible<U>::value>
+  struct OptionalStorage {
+    union {
+      char empty;
+      U stored_value;
+    };
+
+    bool in_use = false;
+
+    LIBC_INLINE ~OptionalStorage() { reset(); }
+
+    LIBC_INLINE constexpr OptionalStorage() : empty() {}
+
+    template <typename... Args>
+    LIBC_INLINE constexpr explicit OptionalStorage(in_place_t, Args &&...args)
+        : stored_value(forward<Args>(args)...) {}
+
+    LIBC_INLINE constexpr void reset() {
+      if (in_use)
+        stored_value.~U();
+      in_use = false;
+    }
+  };
+
+  // The only difference is that this type U doesn't have a nontrivial
+  // destructor.
+  template <typename U> struct OptionalStorage<U, false> {
+    union {
+      char empty;
+      U stored_value;
+    };
+
+    bool in_use = false;
+
+    LIBC_INLINE constexpr OptionalStorage() : empty() {}
+
+    template <typename... Args>
+    LIBC_INLINE constexpr explicit OptionalStorage(in_place_t, Args &&...args)
+        : stored_value(forward<Args>(args)...) {}
+
+    LIBC_INLINE constexpr void reset() { in_use = false; }
+  };
+
+  OptionalStorage<T> storage;
+
+public:
+  LIBC_INLINE constexpr optional() = default;
+  LIBC_INLINE constexpr optional(nullopt_t) {}
+
+  LIBC_INLINE constexpr optional(const T &t) : storage(in_place, t) {
+    storage.in_use = true;
+  }
+  LIBC_INLINE constexpr optional(const optional &) = default;
+
+  LIBC_INLINE constexpr optional(T &&t) : storage(in_place, move(t)) {
+    storage.in_use = true;
+  }
+  LIBC_INLINE constexpr optional(optional &&O) = default;
+
+  template <typename... ArgTypes>
+  LIBC_INLINE constexpr optional(in_place_t, ArgTypes &&...Args)
+      : storage(in_place, forward<ArgTypes>(Args)...) {
+    storage.in_use = true;
+  }
+
+  LIBC_INLINE constexpr optional &operator=(T &&t) {
+    storage = move(t);
+    return *this;
+  }
+  LIBC_INLINE constexpr optional &operator=(optional &&) = default;
+
+  LIBC_INLINE constexpr optional &operator=(const T &t) {
+    storage = t;
+    return *this;
+  }
+  LIBC_INLINE constexpr optional &operator=(const optional &) = default;
+
+  LIBC_INLINE constexpr void reset() { storage.reset(); }
+
+  LIBC_INLINE constexpr const T &value() const & {
+    return storage.stored_value;
+  }
+
+  LIBC_INLINE constexpr T &value() & { return storage.stored_value; }
+
+  LIBC_INLINE constexpr explicit operator bool() const {
+    return storage.in_use;
+  }
+  LIBC_INLINE constexpr bool has_value() const { return storage.in_use; }
+  LIBC_INLINE constexpr const T *operator->() const {
+    return &storage.stored_value;
+  }
+  LIBC_INLINE constexpr T *operator->() { return &storage.stored_value; }
+  LIBC_INLINE constexpr const T &operator*() const & {
+    return storage.stored_value;
+  }
+  LIBC_INLINE constexpr T &operator*() & { return storage.stored_value; }
+
+  LIBC_INLINE constexpr T &&value() && { return move(storage.stored_value); }
+  LIBC_INLINE constexpr T &&operator*() && {
+    return move(storage.stored_value);
+  }
+};
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_OPTIONAL_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/span.h b/contrib/llvm-project/libc/src/__support/CPP/span.h
new file mode 100644
index 000000000000..9234a26d201c
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/span.h
@@ -0,0 +1,131 @@
+//===-- Standalone implementation std::span ---------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_SPAN_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_SPAN_H
+
+#include <stddef.h> // For size_t
+
+#include "array.h" // For array
+#include "limits.h"
+#include "src/__support/macros/config.h"
+#include "type_traits.h" // For remove_cv_t, enable_if_t, is_same_v, is_const_v
+
+#include "src/__support/macros/attributes.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// A trimmed down implementation of std::span.
+// Missing features:
+// - No constant size spans (e.g. Span<int, 4>),
+// - Only handle pointer like types, no fancy interators nor object overriding
+//   the & operator,
+// - No implicit type conversion (e.g. Span<B>, initialized with As where A
+//   inherits from B),
+// - No reverse iterators
+template <typename T> class span {
+  template <typename U>
+  LIBC_INLINE_VAR static constexpr bool is_const_view_v =
+      !cpp::is_const_v<U> && cpp::is_const_v<T> &&
+      cpp::is_same_v<U, remove_cv_t<T>>;
+
+  template <typename U>
+  LIBC_INLINE_VAR static constexpr bool is_compatible_v =
+      cpp::is_same_v<U, T> || is_const_view_v<U>;
+
+public:
+  using element_type = T;
+  using value_type = remove_cv_t<T>;
+  using size_type = size_t;
+  using difference_type = ptrdiff_t;
+  using pointer = T *;
+  using const_pointer = const T *;
+  using reference = T &;
+  using const_reference = const T &;
+  using iterator = T *;
+
+  LIBC_INLINE_VAR static constexpr size_type dynamic_extent =
+      cpp::numeric_limits<size_type>::max();
+
+  LIBC_INLINE constexpr span() : span_data(nullptr), span_size(0) {}
+
+  LIBC_INLINE constexpr span(const span &) = default;
+
+  LIBC_INLINE constexpr span(pointer first, size_type count)
+      : span_data(first), span_size(count) {}
+
+  LIBC_INLINE constexpr span(pointer first, pointer end)
+      : span_data(first), span_size(static_cast<size_t>(end - first)) {}
+
+  template <typename U, size_t N,
+            cpp::enable_if_t<is_compatible_v<U>, bool> = true>
+  LIBC_INLINE constexpr span(U (&arr)[N]) : span_data(arr), span_size(N) {}
+
+  template <typename U, size_t N,
+            cpp::enable_if_t<is_compatible_v<U>, bool> = true>
+  LIBC_INLINE constexpr span(array<U, N> &arr)
+      : span_data(arr.data()), span_size(arr.size()) {}
+
+  template <typename U, cpp::enable_if_t<is_compatible_v<U>, bool> = true>
+  LIBC_INLINE constexpr span(span<U> &s)
+      : span_data(s.data()), span_size(s.size()) {}
+
+  template <typename U, cpp::enable_if_t<is_compatible_v<U>, bool> = true>
+  LIBC_INLINE constexpr span &operator=(span<U> &s) {
+    span_data = s.data();
+    span_size = s.size();
+    return *this;
+  }
+
+  LIBC_INLINE ~span() = default;
+
+  LIBC_INLINE constexpr reference operator[](size_type index) const {
+    return data()[index];
+  }
+
+  LIBC_INLINE constexpr iterator begin() const { return data(); }
+  LIBC_INLINE constexpr iterator end() const { return data() + size(); }
+  LIBC_INLINE constexpr reference front() const { return (*this)[0]; }
+  LIBC_INLINE constexpr reference back() const { return (*this)[size() - 1]; }
+  LIBC_INLINE constexpr pointer data() const { return span_data; }
+  LIBC_INLINE constexpr size_type size() const { return span_size; }
+  LIBC_INLINE constexpr size_type size_bytes() const {
+    return sizeof(T) * size();
+  }
+  LIBC_INLINE constexpr bool empty() const { return size() == 0; }
+
+  LIBC_INLINE constexpr span<element_type>
+  subspan(size_type offset, size_type count = dynamic_extent) const {
+    return span<element_type>(data() + offset, count_to_size(offset, count));
+  }
+
+  LIBC_INLINE constexpr span<element_type> first(size_type count) const {
+    return subspan(0, count);
+  }
+
+  LIBC_INLINE constexpr span<element_type> last(size_type count) const {
+    return span<element_type>(data() + (size() - count), count);
+  }
+
+private:
+  LIBC_INLINE constexpr size_type count_to_size(size_type offset,
+                                                size_type count) const {
+    if (count == dynamic_extent) {
+      return size() - offset;
+    }
+    return count;
+  }
+
+  T *span_data;
+  size_t span_size;
+};
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_SPAN_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/string.h b/contrib/llvm-project/libc/src/__support/CPP/string.h
new file mode 100644
index 000000000000..1ac04c7f1f9d
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/string.h
@@ -0,0 +1,234 @@
+//===-- A simple implementation of the string class -------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_STRING_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_STRING_H
+
+#include "hdr/func/free.h"
+#include "hdr/func/malloc.h"
+#include "hdr/func/realloc.h"
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/integer_to_string.h" // IntegerToString
+#include "src/__support/macros/config.h"
+#include "src/string/memory_utils/inline_memcpy.h"
+#include "src/string/memory_utils/inline_memset.h"
+#include "src/string/string_utils.h" // string_length
+
+#include <stddef.h> // size_t
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// This class mimics std::string but does not intend to be a full fledged
+// implementation. Most notably it does not provide support for character traits
+// nor custom allocator.
+class string {
+private:
+  static constexpr char NULL_CHARACTER = '\0';
+  static constexpr char *get_empty_string() {
+    return const_cast<char *>(&NULL_CHARACTER);
+  }
+
+  char *buffer_ = get_empty_string();
+  size_t size_ = 0;
+  size_t capacity_ = 0;
+
+  constexpr void reset_no_deallocate() {
+    buffer_ = get_empty_string();
+    size_ = 0;
+    capacity_ = 0;
+  }
+
+  void set_size_and_add_null_character(size_t size) {
+    size_ = size;
+    if (buffer_ != get_empty_string())
+      buffer_[size_] = NULL_CHARACTER;
+  }
+
+public:
+  LIBC_INLINE constexpr string() {}
+  LIBC_INLINE string(const string &other) { this->operator+=(other); }
+  LIBC_INLINE constexpr string(string &&other)
+      : buffer_(other.buffer_), size_(other.size_), capacity_(other.capacity_) {
+    other.reset_no_deallocate();
+  }
+  LIBC_INLINE string(const char *cstr, size_t count) {
+    resize(count);
+    inline_memcpy(buffer_, cstr, count);
+  }
+  LIBC_INLINE string(const string_view &view)
+      : string(view.data(), view.size()) {}
+  LIBC_INLINE string(const char *cstr)
+      : string(cstr, ::LIBC_NAMESPACE::internal::string_length(cstr)) {}
+  LIBC_INLINE string(size_t size_, char value) {
+    resize(size_);
+    static_assert(sizeof(char) == sizeof(uint8_t));
+    inline_memset((void *)buffer_, static_cast<uint8_t>(value), size_);
+  }
+
+  LIBC_INLINE string &operator=(const string &other) {
+    resize(0);
+    return (*this) += other;
+  }
+
+  LIBC_INLINE string &operator=(string &&other) {
+    buffer_ = other.buffer_;
+    size_ = other.size_;
+    capacity_ = other.capacity_;
+    other.reset_no_deallocate();
+    return *this;
+  }
+
+  LIBC_INLINE string &operator=(const string_view &view) {
+    return *this = string(view);
+  }
+
+  LIBC_INLINE ~string() {
+    if (buffer_ != get_empty_string())
+      ::free(buffer_);
+  }
+
+  LIBC_INLINE constexpr size_t capacity() const { return capacity_; }
+  LIBC_INLINE constexpr size_t size() const { return size_; }
+  LIBC_INLINE constexpr bool empty() const { return size_ == 0; }
+
+  LIBC_INLINE constexpr const char *data() const { return buffer_; }
+  LIBC_INLINE char *data() { return buffer_; }
+
+  LIBC_INLINE constexpr const char *begin() const { return data(); }
+  LIBC_INLINE char *begin() { return data(); }
+
+  LIBC_INLINE constexpr const char *end() const { return data() + size_; }
+  LIBC_INLINE char *end() { return data() + size_; }
+
+  LIBC_INLINE constexpr const char &front() const { return data()[0]; }
+  LIBC_INLINE char &front() { return data()[0]; }
+
+  LIBC_INLINE constexpr const char &back() const { return data()[size_ - 1]; }
+  LIBC_INLINE char &back() { return data()[size_ - 1]; }
+
+  LIBC_INLINE constexpr const char &operator[](size_t index) const {
+    return data()[index];
+  }
+  LIBC_INLINE char &operator[](size_t index) { return data()[index]; }
+
+  LIBC_INLINE const char *c_str() const { return data(); }
+
+  LIBC_INLINE operator string_view() const {
+    return string_view(buffer_, size_);
+  }
+
+  LIBC_INLINE void reserve(size_t new_capacity) {
+    ++new_capacity; // Accounting for the terminating '\0'
+    if (new_capacity <= capacity_)
+      return;
+    // We extend the capacity to amortize buffer_ reallocations.
+    // We choose to augment the value by 11 / 8, this is about +40% and division
+    // by 8 is cheap. We guard the extension so the operation doesn't overflow.
+    if (new_capacity < SIZE_MAX / 11)
+      new_capacity = new_capacity * 11 / 8;
+    if (void *Ptr = ::realloc(buffer_ == get_empty_string() ? nullptr : buffer_,
+                              new_capacity)) {
+      buffer_ = static_cast<char *>(Ptr);
+      capacity_ = new_capacity;
+    } else {
+      __builtin_unreachable(); // out of memory
+    }
+  }
+
+  LIBC_INLINE void resize(size_t size) {
+    if (size > capacity_) {
+      reserve(size);
+      const size_t size_extension = size - size_;
+      inline_memset(data() + size_, '\0', size_extension);
+    }
+    set_size_and_add_null_character(size);
+  }
+
+  LIBC_INLINE string &operator+=(const string &rhs) {
+    const size_t new_size = size_ + rhs.size();
+    reserve(new_size);
+    inline_memcpy(buffer_ + size_, rhs.data(), rhs.size());
+    set_size_and_add_null_character(new_size);
+    return *this;
+  }
+
+  LIBC_INLINE string &operator+=(const char c) {
+    const size_t new_size = size_ + 1;
+    reserve(new_size);
+    buffer_[size_] = c;
+    set_size_and_add_null_character(new_size);
+    return *this;
+  }
+};
+
+LIBC_INLINE bool operator==(const string &lhs, const string &rhs) {
+  return string_view(lhs) == string_view(rhs);
+}
+LIBC_INLINE bool operator!=(const string &lhs, const string &rhs) {
+  return string_view(lhs) != string_view(rhs);
+}
+LIBC_INLINE bool operator<(const string &lhs, const string &rhs) {
+  return string_view(lhs) < string_view(rhs);
+}
+LIBC_INLINE bool operator<=(const string &lhs, const string &rhs) {
+  return string_view(lhs) <= string_view(rhs);
+}
+LIBC_INLINE bool operator>(const string &lhs, const string &rhs) {
+  return string_view(lhs) > string_view(rhs);
+}
+LIBC_INLINE bool operator>=(const string &lhs, const string &rhs) {
+  return string_view(lhs) >= string_view(rhs);
+}
+
+LIBC_INLINE string operator+(const string &lhs, const string &rhs) {
+  string Tmp(lhs);
+  return Tmp += rhs;
+}
+LIBC_INLINE string operator+(const string &lhs, const char *rhs) {
+  return lhs + string(rhs);
+}
+LIBC_INLINE string operator+(const char *lhs, const string &rhs) {
+  return string(lhs) + rhs;
+}
+
+namespace internal {
+template <typename T> string to_dec_string(T value) {
+  const IntegerToString<T> buffer(value);
+  return buffer.view();
+}
+} // namespace internal
+
+LIBC_INLINE string to_string(int value) {
+  return internal::to_dec_string<int>(value);
+}
+LIBC_INLINE string to_string(long value) {
+  return internal::to_dec_string<long>(value);
+}
+LIBC_INLINE string to_string(long long value) {
+  return internal::to_dec_string<long long>(value);
+}
+LIBC_INLINE string to_string(unsigned value) {
+  return internal::to_dec_string<unsigned>(value);
+}
+LIBC_INLINE string to_string(unsigned long value) {
+  return internal::to_dec_string<unsigned long>(value);
+}
+LIBC_INLINE string to_string(unsigned long long value) {
+  return internal::to_dec_string<unsigned long long>(value);
+}
+
+// TODO: Support floating point
+// LIBC_INLINE string to_string(float value);
+// LIBC_INLINE string to_string(double value);
+// LIBC_INLINE string to_string(long double value);
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_STRING_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/string_view.h b/contrib/llvm-project/libc/src/__support/CPP/string_view.h
new file mode 100644
index 000000000000..aa15814b2e14
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/string_view.h
@@ -0,0 +1,222 @@
+//===-- Standalone implementation std::string_view --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_STRING_VIEW_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_STRING_VIEW_H
+
+#include "limits.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+#include <stddef.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// This is very simple alternate of the std::string_view class. There is no
+// bounds check performed in any of the methods. The callers are expected to
+// do the checks before invoking the methods.
+//
+// This class will be extended as needed in future.
+class string_view {
+private:
+  const char *Data;
+  size_t Len;
+
+  LIBC_INLINE static size_t min(size_t A, size_t B) { return A <= B ? A : B; }
+
+  LIBC_INLINE static int compareMemory(const char *Lhs, const char *Rhs,
+                                       size_t Length) {
+    for (size_t i = 0; i < Length; ++i)
+      if (int Diff = (int)Lhs[i] - (int)Rhs[i])
+        return Diff;
+    return 0;
+  }
+
+  LIBC_INLINE static constexpr size_t length(const char *Str) {
+    for (const char *End = Str;; ++End)
+      if (*End == '\0')
+        return static_cast<size_t>(End - Str);
+  }
+
+  LIBC_INLINE bool equals(string_view Other) const {
+    return (Len == Other.Len &&
+            compareMemory(Data, Other.Data, Other.Len) == 0);
+  }
+
+public:
+  using value_type = char;
+  using size_type = size_t;
+  using difference_type = ptrdiff_t;
+  using pointer = char *;
+  using const_pointer = const char *;
+  using reference = char &;
+  using const_reference = const char &;
+  using const_iterator = char *;
+  using iterator = const_iterator;
+
+  // special value equal to the maximum value representable by the type
+  // size_type.
+  LIBC_INLINE_VAR static constexpr size_t npos =
+      cpp::numeric_limits<size_t>::max();
+
+  LIBC_INLINE constexpr string_view() : Data(nullptr), Len(0) {}
+
+  // Assumes Str is a null-terminated string. The length of the string does
+  // not include the terminating null character.
+  // Preconditions: [Str, Str + ​length(Str)) is a valid range.
+  LIBC_INLINE constexpr string_view(const char *Str)
+      : Data(Str), Len(length(Str)) {}
+
+  // Preconditions: [Str, Str + N) is a valid range.
+  LIBC_INLINE constexpr string_view(const char *Str, size_t N)
+      : Data(Str), Len(N) {}
+
+  LIBC_INLINE constexpr const char *data() const { return Data; }
+
+  // Returns the size of the string_view.
+  LIBC_INLINE constexpr size_t size() const { return Len; }
+
+  // Returns whether the string_view is empty.
+  LIBC_INLINE constexpr bool empty() const { return Len == 0; }
+
+  // Returns an iterator to the first character of the view.
+  LIBC_INLINE const char *begin() const { return Data; }
+
+  // Returns an iterator to the character following the last character of the
+  // view.
+  LIBC_INLINE const char *end() const { return Data + Len; }
+
+  // Returns a const reference to the character at specified location pos.
+  // No bounds checking is performed: the behavior is undefined if pos >=
+  // size().
+  LIBC_INLINE constexpr const char &operator[](size_t Index) const {
+    return Data[Index];
+  }
+
+  /// compare - Compare two strings; the result is -1, 0, or 1 if this string
+  /// is lexicographically less than, equal to, or greater than the \p Other.
+  LIBC_INLINE int compare(string_view Other) const {
+    // Check the prefix for a mismatch.
+    if (int Res = compareMemory(Data, Other.Data, min(Len, Other.Len)))
+      return Res < 0 ? -1 : 1;
+    // Otherwise the prefixes match, so we only need to check the lengths.
+    if (Len == Other.Len)
+      return 0;
+    return Len < Other.Len ? -1 : 1;
+  }
+
+  LIBC_INLINE bool operator==(string_view Other) const { return equals(Other); }
+  LIBC_INLINE bool operator!=(string_view Other) const {
+    return !(*this == Other);
+  }
+  LIBC_INLINE bool operator<(string_view Other) const {
+    return compare(Other) == -1;
+  }
+  LIBC_INLINE bool operator<=(string_view Other) const {
+    return compare(Other) != 1;
+  }
+  LIBC_INLINE bool operator>(string_view Other) const {
+    return compare(Other) == 1;
+  }
+  LIBC_INLINE bool operator>=(string_view Other) const {
+    return compare(Other) != -1;
+  }
+
+  // Moves the start of the view forward by n characters.
+  // The behavior is undefined if n > size().
+  LIBC_INLINE void remove_prefix(size_t N) {
+    Len -= N;
+    Data += N;
+  }
+
+  // Moves the end of the view back by n characters.
+  // The behavior is undefined if n > size().
+  LIBC_INLINE void remove_suffix(size_t N) { Len -= N; }
+
+  // Check if this string starts with the given Prefix.
+  LIBC_INLINE bool starts_with(string_view Prefix) const {
+    return Len >= Prefix.Len &&
+           compareMemory(Data, Prefix.Data, Prefix.Len) == 0;
+  }
+
+  // Check if this string starts with the given Prefix.
+  LIBC_INLINE bool starts_with(const char Prefix) const {
+    return !empty() && front() == Prefix;
+  }
+
+  // Check if this string ends with the given Prefix.
+  LIBC_INLINE bool ends_with(const char Suffix) const {
+    return !empty() && back() == Suffix;
+  }
+
+  // Check if this string ends with the given Suffix.
+  LIBC_INLINE bool ends_with(string_view Suffix) const {
+    return Len >= Suffix.Len &&
+           compareMemory(end() - Suffix.Len, Suffix.Data, Suffix.Len) == 0;
+  }
+
+  // Return a reference to the substring from [Start, Start + N).
+  //
+  // Start The index of the starting character in the substring; if the index is
+  // npos or greater than the length of the string then the empty substring will
+  // be returned.
+  //
+  // N The number of characters to included in the substring. If N exceeds the
+  // number of characters remaining in the string, the string suffix (starting
+  // with Start) will be returned.
+  LIBC_INLINE string_view substr(size_t Start, size_t N = npos) const {
+    Start = min(Start, Len);
+    return string_view(Data + Start, min(N, Len - Start));
+  }
+
+  // front - Get the first character in the string.
+  LIBC_INLINE char front() const { return Data[0]; }
+
+  // back - Get the last character in the string.
+  LIBC_INLINE char back() const { return Data[Len - 1]; }
+
+  // Finds the first occurence of c in this view, starting at position From.
+  LIBC_INLINE constexpr size_t find_first_of(const char c,
+                                             size_t From = 0) const {
+    for (size_t Pos = From; Pos < size(); ++Pos)
+      if ((*this)[Pos] == c)
+        return Pos;
+    return npos;
+  }
+
+  // Finds the last occurence of c in this view, ending at position End.
+  LIBC_INLINE constexpr size_t find_last_of(const char c,
+                                            size_t End = npos) const {
+    End = End >= size() ? size() : End + 1;
+    for (; End > 0; --End)
+      if ((*this)[End - 1] == c)
+        return End - 1;
+    return npos;
+  }
+
+  // Finds the first character not equal to c in this view, starting at position
+  // From.
+  LIBC_INLINE constexpr size_t find_first_not_of(const char c,
+                                                 size_t From = 0) const {
+    for (size_t Pos = From; Pos < size(); ++Pos)
+      if ((*this)[Pos] != c)
+        return Pos;
+    return npos;
+  }
+
+  // Check if this view contains the given character.
+  LIBC_INLINE constexpr bool contains(char c) const {
+    return find_first_of(c) != npos;
+  }
+};
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_STRING_VIEW_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/stringstream.h b/contrib/llvm-project/libc/src/__support/CPP/stringstream.h
new file mode 100644
index 000000000000..a16084c84868
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/stringstream.h
@@ -0,0 +1,96 @@
+//===-- A simple implementation of string stream class ----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_STRINGSTREAM_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_STRINGSTREAM_H
+
+#include "span.h"
+#include "src/__support/macros/config.h"
+#include "string_view.h"
+#include "type_traits.h"
+
+#include "src/__support/integer_to_string.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// This class is to be used to write simple strings into a user provided buffer
+// without any dynamic memory allocation. There is no requirement to mimic the
+// C++ standard library class std::stringstream.
+class StringStream {
+  span<char> data;
+  size_t write_ptr = 0; // The current write pointer
+  bool err = false;     // If an error occurs while writing
+
+  void write(const char *bytes, size_t size) {
+    size_t i = 0;
+    const size_t data_size = data.size();
+    for (; write_ptr < data_size && i < size; ++i, ++write_ptr)
+      data[write_ptr] = bytes[i];
+    if (i < size) {
+      // If some of the characters couldn't be written, set error.
+      err = true;
+    }
+  }
+
+public:
+  static constexpr char ENDS = '\0';
+
+  // Create a string stream which will write into |buf|.
+  constexpr StringStream(const span<char> &buf) : data(buf) {}
+
+  // Return a string_view to the current characters in the stream. If a
+  // null terminator was not explicitly written, then the return value
+  // will not include one. In order to produce a string_view to a null
+  // terminated string, write ENDS explicitly.
+  string_view str() const { return string_view(data.data(), write_ptr); }
+
+  // Write the characters from |str| to the stream.
+  StringStream &operator<<(string_view str) {
+    write(str.data(), str.size());
+    return *this;
+  }
+
+  // Write the |val| as string.
+  template <typename T, enable_if_t<is_integral_v<T>, int> = 0>
+  StringStream &operator<<(T val) {
+    const IntegerToString<T> buffer(val);
+    return *this << buffer.view();
+  }
+
+  template <typename T, enable_if_t<is_floating_point_v<T>, int> = 0>
+  StringStream &operator<<(T) {
+    // If this specialization gets activated, then the static_assert will
+    // trigger a compile error about missing floating point number support.
+    static_assert(!is_floating_point_v<T>,
+                  "Writing floating point numbers is not yet supported");
+    return *this;
+  }
+
+  // Write a null-terminated string. The terminating null character is not
+  // written to allow stremaing to continue.
+  StringStream &operator<<(const char *str) {
+    return operator<<(string_view(str));
+  }
+
+  // Write a single character.
+  StringStream &operator<<(char a) {
+    write(&a, 1);
+    return *this;
+  }
+
+  // Return true if any write operation(s) failed due to insufficient size.
+  bool overflow() const { return err; }
+
+  size_t bufsize() const { return data.size(); }
+};
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_STRINGSTREAM_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits.h
new file mode 100644
index 000000000000..d48ee23aeae0
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits.h
@@ -0,0 +1,70 @@
+//===-- Self contained C++ type_traits --------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_H
+
+#include "src/__support/CPP/type_traits/add_lvalue_reference.h"
+#include "src/__support/CPP/type_traits/add_pointer.h"
+#include "src/__support/CPP/type_traits/add_rvalue_reference.h"
+#include "src/__support/CPP/type_traits/aligned_storage.h"
+#include "src/__support/CPP/type_traits/bool_constant.h"
+#include "src/__support/CPP/type_traits/conditional.h"
+#include "src/__support/CPP/type_traits/decay.h"
+#include "src/__support/CPP/type_traits/enable_if.h"
+#include "src/__support/CPP/type_traits/false_type.h"
+#include "src/__support/CPP/type_traits/has_unique_object_representations.h"
+#include "src/__support/CPP/type_traits/integral_constant.h"
+#include "src/__support/CPP/type_traits/invoke.h"
+#include "src/__support/CPP/type_traits/invoke_result.h"
+#include "src/__support/CPP/type_traits/is_arithmetic.h"
+#include "src/__support/CPP/type_traits/is_array.h"
+#include "src/__support/CPP/type_traits/is_base_of.h"
+#include "src/__support/CPP/type_traits/is_class.h"
+#include "src/__support/CPP/type_traits/is_complex.h"
+#include "src/__support/CPP/type_traits/is_const.h"
+#include "src/__support/CPP/type_traits/is_constant_evaluated.h"
+#include "src/__support/CPP/type_traits/is_convertible.h"
+#include "src/__support/CPP/type_traits/is_copy_assignable.h"
+#include "src/__support/CPP/type_traits/is_copy_constructible.h"
+#include "src/__support/CPP/type_traits/is_destructible.h"
+#include "src/__support/CPP/type_traits/is_enum.h"
+#include "src/__support/CPP/type_traits/is_fixed_point.h"
+#include "src/__support/CPP/type_traits/is_floating_point.h"
+#include "src/__support/CPP/type_traits/is_function.h"
+#include "src/__support/CPP/type_traits/is_integral.h"
+#include "src/__support/CPP/type_traits/is_lvalue_reference.h"
+#include "src/__support/CPP/type_traits/is_member_pointer.h"
+#include "src/__support/CPP/type_traits/is_move_assignable.h"
+#include "src/__support/CPP/type_traits/is_move_constructible.h"
+#include "src/__support/CPP/type_traits/is_null_pointer.h"
+#include "src/__support/CPP/type_traits/is_object.h"
+#include "src/__support/CPP/type_traits/is_pointer.h"
+#include "src/__support/CPP/type_traits/is_reference.h"
+#include "src/__support/CPP/type_traits/is_rvalue_reference.h"
+#include "src/__support/CPP/type_traits/is_same.h"
+#include "src/__support/CPP/type_traits/is_scalar.h"
+#include "src/__support/CPP/type_traits/is_signed.h"
+#include "src/__support/CPP/type_traits/is_trivially_constructible.h"
+#include "src/__support/CPP/type_traits/is_trivially_copyable.h"
+#include "src/__support/CPP/type_traits/is_trivially_destructible.h"
+#include "src/__support/CPP/type_traits/is_union.h"
+#include "src/__support/CPP/type_traits/is_unsigned.h"
+#include "src/__support/CPP/type_traits/is_void.h"
+#include "src/__support/CPP/type_traits/make_signed.h"
+#include "src/__support/CPP/type_traits/make_unsigned.h"
+#include "src/__support/CPP/type_traits/remove_all_extents.h"
+#include "src/__support/CPP/type_traits/remove_cv.h"
+#include "src/__support/CPP/type_traits/remove_cvref.h"
+#include "src/__support/CPP/type_traits/remove_extent.h"
+#include "src/__support/CPP/type_traits/remove_reference.h"
+#include "src/__support/CPP/type_traits/true_type.h"
+#include "src/__support/CPP/type_traits/type_identity.h"
+#include "src/__support/CPP/type_traits/void_t.h"
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/add_lvalue_reference.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/add_lvalue_reference.h
new file mode 100644
index 000000000000..6f5fc6b0a4be
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/add_lvalue_reference.h
@@ -0,0 +1,33 @@
+//===-- add_lvalue_reference type_traits ------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_ADD_LVALUE_REFERENCE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_ADD_LVALUE_REFERENCE_H
+
+#include "src/__support/CPP/type_traits/type_identity.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// add_lvalue_reference
+namespace detail {
+template <class T> // Note that `cv void&` is a substitution failure
+auto try_add_lvalue_reference(int) -> cpp::type_identity<T &>;
+template <class T> // Handle T = cv void case
+auto try_add_lvalue_reference(...) -> cpp::type_identity<T>;
+} // namespace detail
+template <class T>
+struct add_lvalue_reference : decltype(detail::try_add_lvalue_reference<T>(0)) {
+};
+template <class T>
+using add_lvalue_reference_t = typename add_lvalue_reference<T>::type;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_ADD_LVALUE_REFERENCE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/add_pointer.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/add_pointer.h
new file mode 100644
index 000000000000..2568a35653ed
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/add_pointer.h
@@ -0,0 +1,30 @@
+//===-- add_pointer type_traits ---------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_ADD_POINTER_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_ADD_POINTER_H
+
+#include "src/__support/CPP/type_traits/remove_reference.h"
+#include "src/__support/CPP/type_traits/type_identity.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// add_pointer
+namespace detail {
+template <class T>
+auto try_add_pointer(int) -> cpp::type_identity<cpp::remove_reference_t<T> *>;
+template <class T> auto try_add_pointer(...) -> cpp::type_identity<T>;
+} // namespace detail
+template <class T>
+struct add_pointer : decltype(detail::try_add_pointer<T>(0)) {};
+template <class T> using add_pointer_t = typename add_pointer<T>::type;
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_ADD_POINTER_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/add_rvalue_reference.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/add_rvalue_reference.h
new file mode 100644
index 000000000000..f51ebf46d7c8
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/add_rvalue_reference.h
@@ -0,0 +1,32 @@
+//===-- add_rvalue_reference type_traits ------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_ADD_RVALUE_REFERENCE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_ADD_RVALUE_REFERENCE_H
+
+#include "src/__support/CPP/type_traits/type_identity.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// add_rvalue_reference
+namespace detail {
+template <class T>
+auto try_add_rvalue_reference(int) -> cpp::type_identity<T &&>;
+template <class T> auto try_add_rvalue_reference(...) -> cpp::type_identity<T>;
+} // namespace detail
+template <class T>
+struct add_rvalue_reference : decltype(detail::try_add_rvalue_reference<T>(0)) {
+};
+template <class T>
+using add_rvalue_reference_t = typename add_rvalue_reference<T>::type;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_ADD_RVALUE_REFERENCE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/aligned_storage.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/aligned_storage.h
new file mode 100644
index 000000000000..69ad4cc8478e
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/aligned_storage.h
@@ -0,0 +1,30 @@
+//===-- aligned_storage type_traits    --------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_ALIGNED_STORAGE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_ALIGNED_STORAGE_H
+
+#include "src/__support/macros/config.h"
+#include <stddef.h> // size_t
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+template <size_t Len, size_t Align> struct aligned_storage {
+  struct type {
+    alignas(Align) unsigned char data[Len];
+  };
+};
+
+template <size_t Len, size_t Align>
+using aligned_storage_t = typename aligned_storage<Len, Align>::type;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_ALIGNED_STORAGE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/always_false.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/always_false.h
new file mode 100644
index 000000000000..218eb9d577ec
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/always_false.h
@@ -0,0 +1,32 @@
+//===-- convenient static_assert(false) helper ------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_ALWAYS_FALSE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_ALWAYS_FALSE_H
+
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// This is technically not part of the standard but it come often enough that
+// it's convenient to have around.
+//
+// https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2593r0.html#valid-workaround
+//
+// This will be fixed in C++23 according to [CWG
+// 2518](https://cplusplus.github.io/CWG/issues/2518.html).
+
+// Usage `static_assert(cpp::always_false<T>, "error message");`
+template <typename...> LIBC_INLINE_VAR constexpr bool always_false = false;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_ALWAYS_FALSE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/bool_constant.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/bool_constant.h
new file mode 100644
index 000000000000..e61a81a84b0f
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/bool_constant.h
@@ -0,0 +1,23 @@
+//===-- bool_constant type_traits -------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_BOOL_CONSTANT_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_BOOL_CONSTANT_H
+
+#include "src/__support/CPP/type_traits/integral_constant.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// bool_constant
+template <bool V> using bool_constant = cpp::integral_constant<bool, V>;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_BOOL_CONSTANT_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/conditional.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/conditional.h
new file mode 100644
index 000000000000..effcda02da1a
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/conditional.h
@@ -0,0 +1,28 @@
+//===-- conditional type_traits ---------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_CONDITIONAL_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_CONDITIONAL_H
+
+#include "src/__support/CPP/type_traits/type_identity.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// conditional
+template <bool B, typename T, typename F>
+struct conditional : type_identity<T> {};
+template <typename T, typename F>
+struct conditional<false, T, F> : type_identity<F> {};
+template <bool B, typename T, typename F>
+using conditional_t = typename conditional<B, T, F>::type;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_CONDITIONAL_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/decay.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/decay.h
new file mode 100644
index 000000000000..c07e9e855778
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/decay.h
@@ -0,0 +1,40 @@
+//===-- decay type_traits ---------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_DECAY_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_DECAY_H
+
+#include "src/__support/macros/attributes.h"
+
+#include "src/__support/CPP/type_traits/add_pointer.h"
+#include "src/__support/CPP/type_traits/conditional.h"
+#include "src/__support/CPP/type_traits/is_array.h"
+#include "src/__support/CPP/type_traits/is_function.h"
+#include "src/__support/CPP/type_traits/remove_cv.h"
+#include "src/__support/CPP/type_traits/remove_extent.h"
+#include "src/__support/CPP/type_traits/remove_reference.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// decay
+template <class T> class decay {
+  using U = cpp::remove_reference_t<T>;
+
+public:
+  using type = conditional_t<
+      cpp::is_array_v<U>, cpp::add_pointer_t<cpp::remove_extent_t<U>>,
+      cpp::conditional_t<cpp::is_function_v<U>, cpp::add_pointer_t<U>,
+                         cpp::remove_cv_t<U>>>;
+};
+template <class T> using decay_t = typename decay<T>::type;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_DECAY_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/enable_if.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/enable_if.h
new file mode 100644
index 000000000000..a2ce2037eb96
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/enable_if.h
@@ -0,0 +1,26 @@
+//===-- enable_if type_traits -----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_ENABLE_IF_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_ENABLE_IF_H
+
+#include "src/__support/CPP/type_traits/type_identity.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// enable_if
+template <bool B, typename T = void> struct enable_if;
+template <typename T> struct enable_if<true, T> : type_identity<T> {};
+template <bool B, typename T = void>
+using enable_if_t = typename enable_if<B, T>::type;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_ENABLE_IF_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/false_type.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/false_type.h
new file mode 100644
index 000000000000..65934b96bab0
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/false_type.h
@@ -0,0 +1,23 @@
+//===-- false_type type_traits ----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_FALSE_TYPE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_FALSE_TYPE_H
+
+#include "src/__support/CPP/type_traits/bool_constant.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// false_type
+using false_type = cpp::bool_constant<false>;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_FALSE_TYPE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/has_unique_object_representations.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/has_unique_object_representations.h
new file mode 100644
index 000000000000..639fb69d2720
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/has_unique_object_representations.h
@@ -0,0 +1,30 @@
+//===-- has_unique_object_representations type_traits ------------*- C++-*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_HAS_UNIQUE_OBJECT_REPRESENTATIONS_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_HAS_UNIQUE_OBJECT_REPRESENTATIONS_H
+
+#include "src/__support/CPP/type_traits/integral_constant.h"
+#include "src/__support/CPP/type_traits/remove_all_extents.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+template <class T>
+struct has_unique_object_representations
+    : public integral_constant<bool, __has_unique_object_representations(
+                                         remove_all_extents_t<T>)> {};
+
+template <class T>
+LIBC_INLINE_VAR constexpr bool has_unique_object_representations_v =
+    has_unique_object_representations<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_HAS_UNIQUE_OBJECT_REPRESENTATIONS_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/integral_constant.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/integral_constant.h
new file mode 100644
index 000000000000..931a9b98a64c
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/integral_constant.h
@@ -0,0 +1,26 @@
+//===-- integral_constant type_traits ---------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_INTEGRAL_CONSTANT_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_INTEGRAL_CONSTANT_H
+
+#include "src/__support/macros/attributes.h" // LIBC_INLINE_VAR
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// integral_constant
+template <typename T, T v> struct integral_constant {
+  using value_type = T;
+  LIBC_INLINE_VAR static constexpr T value = v;
+};
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_INTEGRAL_CONSTANT_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/invoke.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/invoke.h
new file mode 100644
index 000000000000..e4d9be74d12d
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/invoke.h
@@ -0,0 +1,67 @@
+//===-- invoke type_traits --------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_INVOKE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_INVOKE_H
+
+#include "src/__support/CPP/type_traits/always_false.h"
+#include "src/__support/CPP/type_traits/decay.h"
+#include "src/__support/CPP/type_traits/enable_if.h"
+#include "src/__support/CPP/type_traits/is_base_of.h"
+#include "src/__support/CPP/type_traits/is_pointer.h"
+#include "src/__support/CPP/type_traits/is_same.h"
+#include "src/__support/CPP/utility/forward.h"
+#include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+namespace detail {
+
+// Catch all function and functor types.
+template <class FunctionPtrType> struct invoke_dispatcher {
+  template <class T, class... Args,
+            typename = cpp::enable_if_t<
+                cpp::is_same_v<cpp::decay_t<T>, FunctionPtrType>>>
+  LIBC_INLINE static decltype(auto) call(T &&fun, Args &&...args) {
+    return cpp::forward<T>(fun)(cpp::forward<Args>(args)...);
+  }
+};
+
+// Catch pointer to member function types.
+template <class Class, class FunctionReturnType>
+struct invoke_dispatcher<FunctionReturnType Class::*> {
+  using FunctionPtrType = FunctionReturnType Class::*;
+
+  template <class T, class... Args, class DecayT = cpp::decay_t<T>>
+  LIBC_INLINE static decltype(auto) call(FunctionPtrType fun, T &&t1,
+                                         Args &&...args) {
+    if constexpr (cpp::is_base_of_v<Class, DecayT>) {
+      // T is a (possibly cv ref) type.
+      return (cpp::forward<T>(t1).*fun)(cpp::forward<Args>(args)...);
+    } else if constexpr (cpp::is_pointer_v<T>) {
+      // T is a pointer type.
+      return (*cpp::forward<T>(t1).*fun)(cpp::forward<Args>(args)...);
+    } else {
+      static_assert(cpp::always_false<T>);
+    }
+  }
+};
+
+} // namespace detail
+template <class Function, class... Args>
+decltype(auto) invoke(Function &&fun, Args &&...args) {
+  return detail::invoke_dispatcher<cpp::decay_t<Function>>::call(
+      cpp::forward<Function>(fun), cpp::forward<Args>(args)...);
+}
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_INVOKE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/invoke_result.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/invoke_result.h
new file mode 100644
index 000000000000..71d848b77fd2
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/invoke_result.h
@@ -0,0 +1,29 @@
+//===-- invoke_result type_traits -------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_INVOKE_RESULT_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_INVOKE_RESULT_H
+
+#include "src/__support/CPP/type_traits/invoke.h"
+#include "src/__support/CPP/type_traits/type_identity.h"
+#include "src/__support/CPP/utility/declval.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+template <class F, class... Args>
+struct invoke_result : cpp::type_identity<decltype(cpp::invoke(
+                           cpp::declval<F>(), cpp::declval<Args>()...))> {};
+
+template <class F, class... Args>
+using invoke_result_t = typename invoke_result<F, Args...>::type;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_INVOKE_RESULT_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_arithmetic.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_arithmetic.h
new file mode 100644
index 000000000000..33671b0def43
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_arithmetic.h
@@ -0,0 +1,30 @@
+//===-- is_arithmetic type_traits -------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_ARITHMETIC_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_ARITHMETIC_H
+
+#include "src/__support/CPP/type_traits/bool_constant.h"
+#include "src/__support/CPP/type_traits/is_floating_point.h"
+#include "src/__support/CPP/type_traits/is_integral.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_arithmetic
+template <typename T>
+struct is_arithmetic : cpp::bool_constant<(cpp::is_integral_v<T> ||
+                                           cpp::is_floating_point_v<T>)> {};
+template <typename T>
+LIBC_INLINE_VAR constexpr bool is_arithmetic_v = is_arithmetic<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_ARITHMETIC_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_array.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_array.h
new file mode 100644
index 000000000000..f0ab100fd5c7
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_array.h
@@ -0,0 +1,31 @@
+//===-- is_array type_traits ------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_ARRAY_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_ARRAY_H
+
+#include "src/__support/CPP/type_traits/false_type.h"
+#include "src/__support/CPP/type_traits/true_type.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+#include <stddef.h> // For size_t
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_array
+template <class T> struct is_array : false_type {};
+template <class T> struct is_array<T[]> : true_type {};
+template <class T, size_t N> struct is_array<T[N]> : true_type {};
+template <class T>
+LIBC_INLINE_VAR constexpr bool is_array_v = is_array<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_ARRAY_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_base_of.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_base_of.h
new file mode 100644
index 000000000000..2efd1bf3f1af
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_base_of.h
@@ -0,0 +1,47 @@
+//===-- is_base_of type_traits ----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_BASE_OF_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_BASE_OF_H
+
+#include "src/__support/CPP/type_traits/add_rvalue_reference.h"
+#include "src/__support/CPP/type_traits/false_type.h"
+#include "src/__support/CPP/type_traits/is_class.h"
+#include "src/__support/CPP/type_traits/remove_all_extents.h"
+#include "src/__support/CPP/type_traits/true_type.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_base_of
+namespace detail {
+template <typename B> cpp::true_type __test_ptr_conv(const volatile B *);
+template <typename> cpp::false_type __test_ptr_conv(const volatile void *);
+
+template <typename B, typename D>
+auto is_base_of(int) -> decltype(__test_ptr_conv<B>(static_cast<D *>(nullptr)));
+
+template <typename, typename>
+auto is_base_of(...) -> cpp::true_type; // private or ambiguous base
+
+} // namespace detail
+
+template <typename Base, typename Derived>
+struct is_base_of
+    : cpp::bool_constant<
+          cpp::is_class_v<Base> &&
+          cpp::is_class_v<Derived> &&decltype(detail::is_base_of<Base, Derived>(
+              0))::value> {};
+template <typename Base, typename Derived>
+LIBC_INLINE_VAR constexpr bool is_base_of_v = is_base_of<Base, Derived>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_BASE_OF_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_class.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_class.h
new file mode 100644
index 000000000000..fe12f7d2763c
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_class.h
@@ -0,0 +1,32 @@
+//===-- is_class type_traits ------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_CLASS_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_CLASS_H
+
+#include "src/__support/CPP/type_traits/bool_constant.h"
+#include "src/__support/CPP/type_traits/false_type.h"
+#include "src/__support/CPP/type_traits/is_union.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_class
+namespace detail {
+template <class T> cpp::bool_constant<!cpp::is_union_v<T>> test(int T::*);
+template <class> cpp::false_type test(...);
+} // namespace detail
+template <class T> struct is_class : decltype(detail::test<T>(nullptr)) {};
+template <typename T>
+LIBC_INLINE_VAR constexpr bool is_class_v = is_class<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_CLASS_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_complex.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_complex.h
new file mode 100644
index 000000000000..23f05c08ccab
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_complex.h
@@ -0,0 +1,53 @@
+//===-- is_complex type_traits ----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_COMPLEX_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_COMPLEX_H
+
+#include "src/__support/CPP/type_traits/is_same.h"
+#include "src/__support/CPP/type_traits/remove_cv.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+// LIBC_TYPES_HAS_CFLOAT16 && LIBC_TYPES_HAS_CFLOAT128
+#include "src/__support/macros/properties/complex_types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_complex
+template <typename T> struct is_complex {
+private:
+  template <typename Head, typename... Args>
+  LIBC_INLINE_VAR static constexpr bool __is_unqualified_any_of() {
+    return (... || is_same_v<remove_cv_t<Head>, Args>);
+  }
+
+public:
+  LIBC_INLINE_VAR static constexpr bool value =
+      __is_unqualified_any_of<T, _Complex float, _Complex double,
+                              _Complex long double
+#ifdef LIBC_TYPES_HAS_CFLOAT16
+                              ,
+                              cfloat16
+#endif
+#ifdef LIBC_TYPES_HAS_CFLOAT128
+                              ,
+                              cfloat128
+#endif
+                              >();
+};
+template <typename T>
+LIBC_INLINE_VAR constexpr bool is_complex_v = is_complex<T>::value;
+template <typename T1, typename T2>
+LIBC_INLINE_VAR constexpr bool is_complex_type_same() {
+  return is_same_v<remove_cv_t<T1>, T2>;
+}
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_COMPLEX_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_const.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_const.h
new file mode 100644
index 000000000000..b8e60f79a668
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_const.h
@@ -0,0 +1,28 @@
+//===-- is_const type_traits ------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_CONST_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_CONST_H
+
+#include "src/__support/CPP/type_traits/false_type.h"
+#include "src/__support/CPP/type_traits/true_type.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_const
+template <class T> struct is_const : cpp::false_type {};
+template <class T> struct is_const<const T> : cpp::true_type {};
+template <class T>
+LIBC_INLINE_VAR constexpr bool is_const_v = is_const<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_CONST_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_constant_evaluated.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_constant_evaluated.h
new file mode 100644
index 000000000000..0bb2d0806cb0
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_constant_evaluated.h
@@ -0,0 +1,24 @@
+//===-- is_constant_evaluated type_traits -----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_CONSTANT_EVALUATED_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_CONSTANT_EVALUATED_H
+
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+LIBC_INLINE constexpr bool is_constant_evaluated() {
+  return __builtin_is_constant_evaluated();
+}
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_CONSTANT_EVALUATED_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_convertible.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_convertible.h
new file mode 100644
index 000000000000..a9f94cbb95a2
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_convertible.h
@@ -0,0 +1,48 @@
+//===-- is_convertible type_traits ------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_CONVERTIBLE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_CONVERTIBLE_H
+
+#include "src/__support/CPP/type_traits/is_void.h"
+#include "src/__support/CPP/utility/declval.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_convertible
+namespace detail {
+template <class T>
+auto test_returnable(int)
+    -> decltype(void(static_cast<T (*)()>(nullptr)), cpp::true_type{});
+template <class> auto test_returnable(...) -> cpp::false_type;
+
+template <class From, class To>
+auto test_implicitly_convertible(int)
+    -> decltype(void(cpp::declval<void (&)(To)>()(cpp::declval<From>())),
+                cpp::true_type{});
+template <class, class>
+auto test_implicitly_convertible(...) -> cpp::false_type;
+} // namespace detail
+
+template <class From, class To>
+struct is_convertible
+    : cpp::bool_constant<
+          (decltype(detail::test_returnable<To>(0))::value &&
+           decltype(detail::test_implicitly_convertible<From, To>(0))::value) ||
+          (cpp::is_void_v<From> && cpp::is_void_v<To>)> {};
+
+template <class From, class To>
+LIBC_INLINE_VAR constexpr bool is_convertible_v =
+    is_convertible<From, To>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_CONVERTIBLE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_copy_assignable.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_copy_assignable.h
new file mode 100644
index 000000000000..9beb93d14668
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_copy_assignable.h
@@ -0,0 +1,32 @@
+//===-- is_copy_assignable type_traits --------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_COPY_ASSIGNABLE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_COPY_ASSIGNABLE_H
+
+#include "src/__support/CPP/type_traits/add_lvalue_reference.h"
+#include "src/__support/CPP/type_traits/integral_constant.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is copy assignable
+template <class T>
+struct is_copy_assignable
+    : public integral_constant<
+          bool, __is_assignable(cpp::add_lvalue_reference_t<T>,
+                                cpp::add_lvalue_reference_t<const T>)> {};
+
+template <class T>
+LIBC_INLINE_VAR constexpr bool is_copy_assignable_v =
+    is_copy_assignable<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_COPY_ASSIGNABLE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_copy_constructible.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_copy_constructible.h
new file mode 100644
index 000000000000..d8eb9ad3507e
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_copy_constructible.h
@@ -0,0 +1,31 @@
+//===-- is_copy_constructible type_traits -----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_COPY_CONSTRUCTIBLE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_COPY_CONSTRUCTIBLE_H
+
+#include "src/__support/CPP/type_traits/add_lvalue_reference.h"
+#include "src/__support/CPP/type_traits/integral_constant.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is copy constructible
+template <class T>
+struct is_copy_constructible
+    : public integral_constant<
+          bool, __is_constructible(T, cpp::add_lvalue_reference_t<const T>)> {};
+
+template <class T>
+LIBC_INLINE_VAR constexpr bool is_copy_constructible_v =
+    is_copy_constructible<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_COPY_CONSTRUCTIBLE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_destructible.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_destructible.h
new file mode 100644
index 000000000000..830f22efafa5
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_destructible.h
@@ -0,0 +1,68 @@
+//===-- is_destructible type_traits -----------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_DESTRUCTIBLE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_DESTRUCTIBLE_H
+
+#include "src/__support/CPP/type_traits/bool_constant.h"
+#include "src/__support/CPP/type_traits/false_type.h"
+#include "src/__support/CPP/type_traits/is_function.h"
+#include "src/__support/CPP/type_traits/is_reference.h"
+#include "src/__support/CPP/type_traits/remove_all_extents.h"
+#include "src/__support/CPP/type_traits/true_type.h"
+#include "src/__support/CPP/type_traits/type_identity.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_destructible
+#if __has_builtin(__is_destructible)
+template <typename T>
+struct is_destructible : bool_constant<__is_destructible(T)> {};
+#else
+//  if it's a   reference,              return true
+//  if it's a   function,               return false
+//  if it's     void,                   return false
+//  if it's an  array of unknown bound, return false
+//  Otherwise, return "declval<T&>().~T()" is well-formed
+//    where T is remove_all_extents<T>::type
+template <typename> struct __is_destructible_apply : cpp::type_identity<int> {};
+template <typename T> struct __is_destructor_wellformed {
+  template <typename T1>
+  static cpp::true_type __test(
+      typename __is_destructible_apply<decltype(declval<T1 &>().~T1())>::type);
+  template <typename T1> static cpp::false_type __test(...);
+  static const bool value = decltype(__test<T>(12))::value;
+};
+template <typename T, bool> struct __destructible_imp;
+template <typename T>
+struct __destructible_imp<T, false>
+    : public bool_constant<
+          __is_destructor_wellformed<cpp::remove_all_extents_t<T>>::value> {};
+template <typename T>
+struct __destructible_imp<T, true> : public cpp::true_type {};
+template <typename T, bool> struct __destructible_false;
+template <typename T>
+struct __destructible_false<T, false>
+    : public __destructible_imp<T, is_reference<T>::value> {};
+template <typename T>
+struct __destructible_false<T, true> : public cpp::false_type {};
+template <typename T>
+struct is_destructible : public __destructible_false<T, is_function<T>::value> {
+};
+template <typename T> struct is_destructible<T[]> : public false_type {};
+template <> struct is_destructible<void> : public false_type {};
+#endif
+template <class T>
+LIBC_INLINE_VAR constexpr bool is_destructible_v = is_destructible<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_DESTRUCTIBLE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_enum.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_enum.h
new file mode 100644
index 000000000000..623ae072aff6
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_enum.h
@@ -0,0 +1,26 @@
+//===-- is_enum type_traits -------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_ENUM_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_ENUM_H
+
+#include "src/__support/CPP/type_traits/bool_constant.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_enum
+template <typename T> struct is_enum : bool_constant<__is_enum(T)> {};
+template <typename T>
+LIBC_INLINE_VAR constexpr bool is_enum_v = is_enum<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_ENUM_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_fixed_point.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_fixed_point.h
new file mode 100644
index 000000000000..9df2a7727c96
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_fixed_point.h
@@ -0,0 +1,49 @@
+//===-- is_fixed_point type_traits ------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_FIXED_POINT_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_FIXED_POINT_H
+
+#include "src/__support/CPP/type_traits/is_same.h"
+#include "src/__support/CPP/type_traits/remove_cv.h"
+#include "src/__support/macros/attributes.h"
+
+#include "include/llvm-libc-macros/stdfix-macros.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_fixed_point
+#ifdef LIBC_COMPILER_HAS_FIXED_POINT
+template <typename T> struct is_fixed_point {
+private:
+  template <typename Head, typename... Args>
+  LIBC_INLINE static constexpr bool __is_unqualified_any_of() {
+    return (... || is_same_v<remove_cv_t<Head>, Args>);
+  }
+
+public:
+  LIBC_INLINE_VAR static constexpr bool value = __is_unqualified_any_of<
+      T, short fract, fract, long fract, unsigned short fract, unsigned fract,
+      unsigned long fract, short accum, accum, long accum, unsigned short accum,
+      unsigned accum, unsigned long accum, short sat fract, sat fract,
+      long sat fract, unsigned short sat fract, unsigned sat fract,
+      unsigned long sat fract, short sat accum, sat accum, long sat accum,
+      unsigned short sat accum, unsigned sat accum, unsigned long sat accum>();
+};
+#else
+template <typename T> struct is_fixed_point : false_type {};
+#endif // LIBC_COMPILER_HAS_FIXED_POINT
+
+template <typename T>
+LIBC_INLINE_VAR constexpr bool is_fixed_point_v = is_fixed_point<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_FIXED_POINT_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_floating_point.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_floating_point.h
new file mode 100644
index 000000000000..9dc77ad7ee0e
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_floating_point.h
@@ -0,0 +1,49 @@
+//===-- is_floating_point type_traits ---------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_FLOATING_POINT_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_FLOATING_POINT_H
+
+#include "src/__support/CPP/type_traits/is_same.h"
+#include "src/__support/CPP/type_traits/remove_cv.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_FLOAT128
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_floating_point
+template <typename T> struct is_floating_point {
+private:
+  template <typename Head, typename... Args>
+  LIBC_INLINE_VAR static constexpr bool __is_unqualified_any_of() {
+    return (... || is_same_v<remove_cv_t<Head>, Args>);
+  }
+
+public:
+  LIBC_INLINE_VAR static constexpr bool value =
+      __is_unqualified_any_of<T, float, double, long double
+#ifdef LIBC_TYPES_HAS_FLOAT16
+                              ,
+                              float16
+#endif
+#ifdef LIBC_TYPES_HAS_FLOAT128
+                              ,
+                              float128
+#endif
+                              ,
+                              bfloat16>();
+};
+template <typename T>
+LIBC_INLINE_VAR constexpr bool is_floating_point_v =
+    is_floating_point<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_FLOATING_POINT_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_function.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_function.h
new file mode 100644
index 000000000000..f7717f0a4dcd
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_function.h
@@ -0,0 +1,35 @@
+//===-- is_function type_traits ---------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_FUNCTION_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_FUNCTION_H
+
+#include "src/__support/CPP/type_traits/bool_constant.h"
+#include "src/__support/CPP/type_traits/is_const.h"
+#include "src/__support/CPP/type_traits/is_reference.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_function
+#if __has_builtin(__is_function)
+template <typename T>
+struct is_function : integral_constant<bool, __is_function(T)> {};
+#else
+template <typename T>
+struct is_function
+    : public bool_constant<!(is_reference_v<T> || is_const_v<const T>)> {};
+#endif
+template <class T>
+LIBC_INLINE_VAR constexpr bool is_function_v = is_function<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_FUNCTION_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_integral.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_integral.h
new file mode 100644
index 000000000000..96ba09a07ddc
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_integral.h
@@ -0,0 +1,43 @@
+//===-- is_integral type_traits ---------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_INTEGRAL_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_INTEGRAL_H
+
+#include "src/__support/CPP/type_traits/is_same.h"
+#include "src/__support/CPP/type_traits/remove_cv.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_integral
+template <typename T> struct is_integral {
+private:
+  template <typename Head, typename... Args>
+  LIBC_INLINE_VAR static constexpr bool __is_unqualified_any_of() {
+    return (... || is_same_v<remove_cv_t<Head>, Args>);
+  }
+
+public:
+  LIBC_INLINE_VAR static constexpr bool value = __is_unqualified_any_of<
+      T,
+#ifdef LIBC_TYPES_HAS_INT128
+      __int128_t, __uint128_t,
+#endif
+      char, signed char, unsigned char, short, unsigned short, int,
+      unsigned int, long, unsigned long, long long, unsigned long long, bool>();
+};
+template <typename T>
+LIBC_INLINE_VAR constexpr bool is_integral_v = is_integral<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_INTEGRAL_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_lvalue_reference.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_lvalue_reference.h
new file mode 100644
index 000000000000..e0bfbebdaa29
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_lvalue_reference.h
@@ -0,0 +1,35 @@
+//===-- is_lvalue_reference type_traits -------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_LVALUE_REFERENCE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_LVALUE_REFERENCE_H
+
+#include "src/__support/CPP/type_traits/bool_constant.h"
+#include "src/__support/CPP/type_traits/false_type.h"
+#include "src/__support/CPP/type_traits/true_type.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_lvalue_reference
+#if __has_builtin(__is_lvalue_reference)
+template <typename T>
+struct is_lvalue_reference : bool_constant<__is_lvalue_reference(T)> {};
+#else
+template <typename T> struct is_lvalue_reference : public false_type {};
+template <typename T> struct is_lvalue_reference<T &> : public true_type {};
+#endif
+template <class T>
+LIBC_INLINE_VAR constexpr bool is_lvalue_reference_v =
+    is_lvalue_reference<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_LVALUE_REFERENCE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_member_pointer.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_member_pointer.h
new file mode 100644
index 000000000000..f44567003959
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_member_pointer.h
@@ -0,0 +1,33 @@
+//===-- is_member_pointer type_traits ---------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_MEMBER_POINTER_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_MEMBER_POINTER_H
+
+#include "src/__support/CPP/type_traits/false_type.h"
+#include "src/__support/CPP/type_traits/remove_cv.h"
+#include "src/__support/CPP/type_traits/true_type.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_member_pointer
+template <class T> struct is_member_pointer_helper : cpp::false_type {};
+template <class T, class U>
+struct is_member_pointer_helper<T U::*> : cpp::true_type {};
+template <class T>
+struct is_member_pointer : is_member_pointer_helper<cpp::remove_cv_t<T>> {};
+template <class T>
+LIBC_INLINE_VAR constexpr bool is_member_pointer_v =
+    is_member_pointer<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_MEMBER_POINTER_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_move_assignable.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_move_assignable.h
new file mode 100644
index 000000000000..a788bd9074e3
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_move_assignable.h
@@ -0,0 +1,33 @@
+//===-- is_move_assignable type_traits --------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_MOVE_ASSIGNABLE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_MOVE_ASSIGNABLE_H
+
+#include "src/__support/CPP/type_traits/add_lvalue_reference.h"
+#include "src/__support/CPP/type_traits/add_rvalue_reference.h"
+#include "src/__support/CPP/type_traits/integral_constant.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is move assignable
+template <class T>
+struct is_move_assignable
+    : public integral_constant<bool, __is_assignable(
+                                         cpp::add_lvalue_reference_t<T>,
+                                         cpp::add_rvalue_reference_t<T>)> {};
+
+template <class T>
+LIBC_INLINE_VAR constexpr bool is_move_assignable_v =
+    is_move_assignable<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_MOVE_ASSIGNABLE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_move_constructible.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_move_constructible.h
new file mode 100644
index 000000000000..c89896054625
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_move_constructible.h
@@ -0,0 +1,31 @@
+//===-- is_move_constructible type_traits ------------------------*- C++-*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_MOVE_CONSTRUCTIBLE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_MOVE_CONSTRUCTIBLE_H
+
+#include "src/__support/CPP/type_traits/add_rvalue_reference.h"
+#include "src/__support/CPP/type_traits/integral_constant.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is move constructible
+template <class T>
+struct is_move_constructible
+    : public integral_constant<bool, __is_constructible(
+                                         T, cpp::add_rvalue_reference_t<T>)> {};
+
+template <class T>
+LIBC_INLINE_VAR constexpr bool is_move_constructible_v =
+    is_move_constructible<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_MOVE_CONSTRUCTIBLE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_null_pointer.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_null_pointer.h
new file mode 100644
index 000000000000..acf341311be0
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_null_pointer.h
@@ -0,0 +1,29 @@
+//===-- is_null_pointer type_traits -----------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_NULL_POINTER_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_NULL_POINTER_H
+
+#include "src/__support/CPP/type_traits/is_same.h"
+#include "src/__support/CPP/type_traits/remove_cv.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_null_pointer
+using nullptr_t = decltype(nullptr);
+template <class T>
+struct is_null_pointer : cpp::is_same<cpp::nullptr_t, cpp::remove_cv_t<T>> {};
+template <class T>
+LIBC_INLINE_VAR constexpr bool is_null_pointer_v = is_null_pointer<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_NULL_POINTER_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_object.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_object.h
new file mode 100644
index 000000000000..16799fb8f25f
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_object.h
@@ -0,0 +1,33 @@
+//===-- is_object type_traits -----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_OBJECT_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_OBJECT_H
+
+#include "src/__support/CPP/type_traits/bool_constant.h"
+#include "src/__support/CPP/type_traits/is_array.h"
+#include "src/__support/CPP/type_traits/is_class.h"
+#include "src/__support/CPP/type_traits/is_scalar.h"
+#include "src/__support/CPP/type_traits/is_union.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_object
+template <class T>
+struct is_object
+    : cpp::bool_constant<cpp::is_scalar_v<T> || cpp::is_array_v<T> ||
+                         cpp::is_union_v<T> || cpp::is_class_v<T>> {};
+template <class T>
+LIBC_INLINE_VAR constexpr bool is_object_v = is_object<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_OBJECT_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_pointer.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_pointer.h
new file mode 100644
index 000000000000..606c8e9e8c0f
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_pointer.h
@@ -0,0 +1,31 @@
+//===-- is_pointer type_traits ----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_POINTER_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_POINTER_H
+
+#include "src/__support/CPP/type_traits/false_type.h"
+#include "src/__support/CPP/type_traits/true_type.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_pointer
+template <typename T> struct is_pointer : cpp::false_type {};
+template <typename T> struct is_pointer<T *> : cpp::true_type {};
+template <typename T> struct is_pointer<T *const> : cpp::true_type {};
+template <typename T> struct is_pointer<T *volatile> : cpp::true_type {};
+template <typename T> struct is_pointer<T *const volatile> : cpp::true_type {};
+template <typename T>
+LIBC_INLINE_VAR constexpr bool is_pointer_v = is_pointer<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_POINTER_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_reference.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_reference.h
new file mode 100644
index 000000000000..12da81778fd5
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_reference.h
@@ -0,0 +1,34 @@
+//===-- is_reference type_traits --------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_REFERENCE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_REFERENCE_H
+
+#include "src/__support/CPP/type_traits/bool_constant.h"
+#include "src/__support/CPP/type_traits/false_type.h"
+#include "src/__support/CPP/type_traits/true_type.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_reference
+#if __has_builtin(__is_reference)
+template <typename T> struct is_reference : bool_constant<__is_reference(T)> {};
+#else
+template <typename T> struct is_reference : public false_type {};
+template <typename T> struct is_reference<T &> : public true_type {};
+template <typename T> struct is_reference<T &&> : public true_type {};
+#endif
+template <class T>
+LIBC_INLINE_VAR constexpr bool is_reference_v = is_reference<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_REFERENCE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_rvalue_reference.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_rvalue_reference.h
new file mode 100644
index 000000000000..998b6353afb1
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_rvalue_reference.h
@@ -0,0 +1,35 @@
+//===-- is_rvalue_reference type_traits -------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_RVALUE_REFERENCE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_RVALUE_REFERENCE_H
+
+#include "src/__support/CPP/type_traits/bool_constant.h"
+#include "src/__support/CPP/type_traits/false_type.h"
+#include "src/__support/CPP/type_traits/true_type.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_rvalue_reference
+#if __has_builtin(__is_rvalue_reference)
+template <typename T>
+struct is_rvalue_reference : bool_constant<__is_rvalue_reference(T)> {};
+#else
+template <typename T> struct is_rvalue_reference : public false_type {};
+template <typename T> struct is_rvalue_reference<T &&> : public true_type {};
+#endif
+template <class T>
+LIBC_INLINE_VAR constexpr bool is_rvalue_reference_v =
+    is_rvalue_reference<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_RVALUE_REFERENCE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_same.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_same.h
new file mode 100644
index 000000000000..306d16b86f88
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_same.h
@@ -0,0 +1,28 @@
+//===-- is_same type_traits -------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_SAME_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_SAME_H
+
+#include "src/__support/CPP/type_traits/false_type.h"
+#include "src/__support/CPP/type_traits/true_type.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_same
+template <typename T, typename U> struct is_same : cpp::false_type {};
+template <typename T> struct is_same<T, T> : cpp::true_type {};
+template <typename T, typename U>
+LIBC_INLINE_VAR constexpr bool is_same_v = is_same<T, U>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_SAME_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_scalar.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_scalar.h
new file mode 100644
index 000000000000..7f8a750cd7ed
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_scalar.h
@@ -0,0 +1,35 @@
+//===-- is_scalar type_traits -----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_SCALAR_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_SCALAR_H
+
+#include "src/__support/CPP/type_traits/bool_constant.h"
+#include "src/__support/CPP/type_traits/is_arithmetic.h"
+#include "src/__support/CPP/type_traits/is_enum.h"
+#include "src/__support/CPP/type_traits/is_member_pointer.h"
+#include "src/__support/CPP/type_traits/is_null_pointer.h"
+#include "src/__support/CPP/type_traits/is_pointer.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_scalar
+template <class T>
+struct is_scalar
+    : cpp::bool_constant<cpp::is_arithmetic_v<T> || cpp::is_enum_v<T> ||
+                         cpp::is_pointer_v<T> || cpp::is_member_pointer_v<T> ||
+                         cpp::is_null_pointer_v<T>> {};
+template <class T>
+LIBC_INLINE_VAR constexpr bool is_scalar_v = is_scalar<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_SCALAR_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_signed.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_signed.h
new file mode 100644
index 000000000000..2ddb43ac4ee3
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_signed.h
@@ -0,0 +1,54 @@
+//===-- is_signed type_traits -----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_SIGNED_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_SIGNED_H
+
+#include "include/llvm-libc-macros/stdfix-macros.h"
+#include "src/__support/CPP/type_traits/bool_constant.h"
+#include "src/__support/CPP/type_traits/is_arithmetic.h"
+#include "src/__support/CPP/type_traits/is_same.h"
+#include "src/__support/CPP/type_traits/remove_cv.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+#ifndef LIBC_COMPILER_HAS_FIXED_POINT
+template <typename T>
+struct is_signed : bool_constant<(is_arithmetic_v<T> && (T(-1) < T(0)))> {
+  LIBC_INLINE constexpr operator bool() const { return is_signed::value; }
+  LIBC_INLINE constexpr bool operator()() const { return is_signed::value; }
+};
+#else
+template <typename T> struct is_signed {
+private:
+  template <typename Head, typename... Args>
+  LIBC_INLINE static constexpr bool __is_unqualified_any_of() {
+    return (... || is_same_v<remove_cv_t<Head>, Args>);
+  }
+
+public:
+  LIBC_INLINE_VAR static constexpr bool value =
+      (is_arithmetic_v<T> && (T(-1) < T(0))) ||
+      __is_unqualified_any_of<T, short fract, fract, long fract, short accum,
+                              accum, long accum, short sat fract, sat fract,
+                              long sat fract, short sat accum, sat accum,
+                              long sat accum>();
+  LIBC_INLINE constexpr operator bool() const { return is_signed::value; }
+  LIBC_INLINE constexpr bool operator()() const { return is_signed::value; }
+};
+#endif // LIBC_COMPILER_HAS_FIXED_POINT
+
+template <typename T>
+LIBC_INLINE_VAR constexpr bool is_signed_v = is_signed<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_SIGNED_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_trivially_constructible.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_trivially_constructible.h
new file mode 100644
index 000000000000..b801911038a9
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_trivially_constructible.h
@@ -0,0 +1,25 @@
+//===-- is_trivially_constructible type_traits ------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_TRIVIALLY_CONSTRUCTIBLE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_TRIVIALLY_CONSTRUCTIBLE_H
+
+#include "src/__support/CPP/type_traits/integral_constant.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_trivially_constructible
+template <class T, class... Args>
+struct is_trivially_constructible
+    : integral_constant<bool, __is_trivially_constructible(T, Args...)> {};
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_TRIVIALLY_CONSTRUCTIBLE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_trivially_copyable.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_trivially_copyable.h
new file mode 100644
index 000000000000..a3e786fe1d14
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_trivially_copyable.h
@@ -0,0 +1,29 @@
+//===-- is_trivially_copyable type_traits -----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_TRIVIALLY_COPYABLE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_TRIVIALLY_COPYABLE_H
+
+#include "src/__support/CPP/type_traits/integral_constant.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_trivially_copyable
+template <class T>
+struct is_trivially_copyable
+    : public integral_constant<bool, __is_trivially_copyable(T)> {};
+
+template <class T>
+LIBC_INLINE_VAR constexpr bool is_trivially_copyable_v =
+    is_trivially_copyable<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_TRIVIALLY_COPYABLE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_trivially_destructible.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_trivially_destructible.h
new file mode 100644
index 000000000000..d727a0ec3a82
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_trivially_destructible.h
@@ -0,0 +1,37 @@
+//===-- is_trivially_destructible type_traits -------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_TRIVIALLY_DESTRUCTIBLE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_TRIVIALLY_DESTRUCTIBLE_H
+
+#include "src/__support/CPP/type_traits/bool_constant.h"
+#include "src/__support/CPP/type_traits/is_destructible.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_trivially_destructible
+#if __has_builtin(__is_trivially_destructible)
+template <typename T>
+struct is_trivially_destructible
+    : public bool_constant<__is_trivially_destructible(T)> {};
+#else
+template <typename T>
+struct is_trivially_destructible
+    : public bool_constant<cpp::is_destructible_v<T> &&__has_trivial_destructor(
+          T)> {};
+#endif // __has_builtin(__is_trivially_destructible)
+template <typename T>
+LIBC_INLINE_VAR constexpr bool is_trivially_destructible_v =
+    is_trivially_destructible<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_TRIVIALLY_DESTRUCTIBLE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_union.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_union.h
new file mode 100644
index 000000000000..00ca11a351bd
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_union.h
@@ -0,0 +1,26 @@
+//===-- is_union type_traits ------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_UNION_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_UNION_H
+
+#include "src/__support/CPP/type_traits/bool_constant.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_union
+template <class T> struct is_union : bool_constant<__is_union(T)> {};
+template <typename T>
+LIBC_INLINE_VAR constexpr bool is_union_v = is_union<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_UNION_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_unsigned.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_unsigned.h
new file mode 100644
index 000000000000..3ae6337ceb50
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_unsigned.h
@@ -0,0 +1,56 @@
+//===-- is_unsigned type_traits ---------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_UNSIGNED_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_UNSIGNED_H
+
+#include "include/llvm-libc-macros/stdfix-macros.h"
+#include "src/__support/CPP/type_traits/bool_constant.h"
+#include "src/__support/CPP/type_traits/is_arithmetic.h"
+#include "src/__support/CPP/type_traits/is_same.h"
+#include "src/__support/CPP/type_traits/remove_cv.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+#ifndef LIBC_COMPILER_HAS_FIXED_POINT
+template <typename T>
+struct is_unsigned : bool_constant<(is_arithmetic_v<T> && (T(-1) > T(0)))> {
+  LIBC_INLINE constexpr operator bool() const { return is_unsigned::value; }
+  LIBC_INLINE constexpr bool operator()() const { return is_unsigned::value; }
+};
+#else
+template <typename T> struct is_unsigned {
+private:
+  template <typename Head, typename... Args>
+  LIBC_INLINE static constexpr bool __is_unqualified_any_of() {
+    return (... || is_same_v<remove_cv_t<Head>, Args>);
+  }
+
+public:
+  LIBC_INLINE_VAR static constexpr bool value =
+      (is_arithmetic_v<T> && (T(-1) > T(0))) ||
+      __is_unqualified_any_of<T, unsigned short fract, unsigned fract,
+                              unsigned long fract, unsigned short accum,
+                              unsigned accum, unsigned long accum,
+                              unsigned short sat fract, unsigned sat fract,
+                              unsigned long sat fract, unsigned short sat accum,
+                              unsigned sat accum, unsigned long sat accum>();
+  LIBC_INLINE constexpr operator bool() const { return is_unsigned::value; }
+  LIBC_INLINE constexpr bool operator()() const { return is_unsigned::value; }
+};
+#endif // LIBC_COMPILER_HAS_FIXED_POINT
+
+template <typename T>
+LIBC_INLINE_VAR constexpr bool is_unsigned_v = is_unsigned<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_UNSIGNED_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_void.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_void.h
new file mode 100644
index 000000000000..30459dcf91a7
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/is_void.h
@@ -0,0 +1,27 @@
+//===-- is_void type_traits -------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_VOID_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_VOID_H
+
+#include "src/__support/CPP/type_traits/is_same.h"
+#include "src/__support/CPP/type_traits/remove_cv.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// is_void
+template <typename T> struct is_void : is_same<void, remove_cv_t<T>> {};
+template <typename T>
+LIBC_INLINE_VAR constexpr bool is_void_v = is_void<T>::value;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_IS_VOID_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/make_signed.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/make_signed.h
new file mode 100644
index 000000000000..00bc6be8fcc1
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/make_signed.h
@@ -0,0 +1,41 @@
+//===-- make_signed type_traits ---------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_MAKE_SIGNED_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_MAKE_SIGNED_H
+
+#include "src/__support/CPP/type_traits/type_identity.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// make_signed
+template <typename T> struct make_signed;
+template <> struct make_signed<char> : type_identity<char> {};
+template <> struct make_signed<signed char> : type_identity<char> {};
+template <> struct make_signed<short> : type_identity<short> {};
+template <> struct make_signed<int> : type_identity<int> {};
+template <> struct make_signed<long> : type_identity<long> {};
+template <> struct make_signed<long long> : type_identity<long long> {};
+template <> struct make_signed<unsigned char> : type_identity<char> {};
+template <> struct make_signed<unsigned short> : type_identity<short> {};
+template <> struct make_signed<unsigned int> : type_identity<int> {};
+template <> struct make_signed<unsigned long> : type_identity<long> {};
+template <>
+struct make_signed<unsigned long long> : type_identity<long long> {};
+#ifdef LIBC_TYPES_HAS_INT128
+template <> struct make_signed<__int128_t> : type_identity<__int128_t> {};
+template <> struct make_signed<__uint128_t> : type_identity<__int128_t> {};
+#endif
+template <typename T> using make_signed_t = typename make_signed<T>::type;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_MAKE_SIGNED_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/make_unsigned.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/make_unsigned.h
new file mode 100644
index 000000000000..e5f60ae66521
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/make_unsigned.h
@@ -0,0 +1,46 @@
+//===-- make_unsigned type_traits -------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_MAKE_UNSIGNED_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_MAKE_UNSIGNED_H
+
+#include "src/__support/CPP/type_traits/type_identity.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// make_unsigned
+
+template <typename T> struct make_unsigned;
+template <> struct make_unsigned<char> : type_identity<unsigned char> {};
+template <> struct make_unsigned<signed char> : type_identity<unsigned char> {};
+template <> struct make_unsigned<short> : type_identity<unsigned short> {};
+template <> struct make_unsigned<int> : type_identity<unsigned int> {};
+template <> struct make_unsigned<long> : type_identity<unsigned long> {};
+template <>
+struct make_unsigned<long long> : type_identity<unsigned long long> {};
+template <>
+struct make_unsigned<unsigned char> : type_identity<unsigned char> {};
+template <>
+struct make_unsigned<unsigned short> : type_identity<unsigned short> {};
+template <> struct make_unsigned<unsigned int> : type_identity<unsigned int> {};
+template <>
+struct make_unsigned<unsigned long> : type_identity<unsigned long> {};
+template <>
+struct make_unsigned<unsigned long long> : type_identity<unsigned long long> {};
+#ifdef LIBC_TYPES_HAS_INT128
+template <> struct make_unsigned<__int128_t> : type_identity<__uint128_t> {};
+template <> struct make_unsigned<__uint128_t> : type_identity<__uint128_t> {};
+#endif
+template <typename T> using make_unsigned_t = typename make_unsigned<T>::type;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_MAKE_UNSIGNED_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/remove_all_extents.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/remove_all_extents.h
new file mode 100644
index 000000000000..bc577ca6f4df
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/remove_all_extents.h
@@ -0,0 +1,41 @@
+//===-- remove_all_extents type_traits --------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_REMOVE_ALL_EXTENTS_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_REMOVE_ALL_EXTENTS_H
+
+#include "src/__support/CPP/type_traits/type_identity.h"
+#include "src/__support/macros/config.h"
+
+#include <stddef.h> // size_t
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// remove_all_extents
+#if __has_builtin(__remove_all_extents)
+template <typename T> using remove_all_extents_t = __remove_all_extents(T);
+template <typename T>
+struct remove_all_extents : cpp::type_identity<remove_all_extents_t<T>> {};
+#else
+template <typename T> struct remove_all_extents {
+  using type = T;
+};
+template <typename T> struct remove_all_extents<T[]> {
+  using type = typename remove_all_extents<T>::type;
+};
+template <typename T, size_t _Np> struct remove_all_extents<T[_Np]> {
+  using type = typename remove_all_extents<T>::type;
+};
+template <typename T>
+using remove_all_extents_t = typename remove_all_extents<T>::type;
+#endif
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_REMOVE_ALL_EXTENTS_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/remove_cv.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/remove_cv.h
new file mode 100644
index 000000000000..2e843e0b4363
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/remove_cv.h
@@ -0,0 +1,28 @@
+//===-- remove_cv type_traits -----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_REMOVE_CV_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_REMOVE_CV_H
+
+#include "src/__support/CPP/type_traits/type_identity.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// remove_cv
+template <class T> struct remove_cv : cpp::type_identity<T> {};
+template <class T> struct remove_cv<const T> : cpp::type_identity<T> {};
+template <class T> struct remove_cv<volatile T> : cpp::type_identity<T> {};
+template <class T>
+struct remove_cv<const volatile T> : cpp::type_identity<T> {};
+template <class T> using remove_cv_t = typename remove_cv<T>::type;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_REMOVE_CV_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/remove_cvref.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/remove_cvref.h
new file mode 100644
index 000000000000..27591783fd7a
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/remove_cvref.h
@@ -0,0 +1,27 @@
+//===-- remove_cvref type_traits --------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_REMOVE_CVREF_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_REMOVE_CVREF_H
+
+#include "src/__support/CPP/type_traits/remove_cv.h"
+#include "src/__support/CPP/type_traits/remove_reference.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// remove_cvref
+template <typename T> struct remove_cvref {
+  using type = remove_cv_t<remove_reference_t<T>>;
+};
+template <typename T> using remove_cvref_t = typename remove_cvref<T>::type;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_REMOVE_CVREF_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/remove_extent.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/remove_extent.h
new file mode 100644
index 000000000000..4f5ffd34530d
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/remove_extent.h
@@ -0,0 +1,28 @@
+//===-- remove_extent type_traits -------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_REMOVE_EXTENT_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_REMOVE_EXTENT_H
+
+#include "src/__support/CPP/type_traits/type_identity.h"
+#include "src/__support/macros/config.h"
+#include "stddef.h" // size_t
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// remove_extent
+template <class T> struct remove_extent : cpp::type_identity<T> {};
+template <class T> struct remove_extent<T[]> : cpp::type_identity<T> {};
+template <class T, size_t N>
+struct remove_extent<T[N]> : cpp::type_identity<T> {};
+template <class T> using remove_extent_t = typename remove_extent<T>::type;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_REMOVE_EXTENT_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/remove_reference.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/remove_reference.h
new file mode 100644
index 000000000000..26ded0879f19
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/remove_reference.h
@@ -0,0 +1,27 @@
+//===-- remove_reference type_traits ----------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_REMOVE_REFERENCE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_REMOVE_REFERENCE_H
+
+#include "src/__support/CPP/type_traits/type_identity.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// remove_reference
+template <class T> struct remove_reference : cpp::type_identity<T> {};
+template <class T> struct remove_reference<T &> : cpp::type_identity<T> {};
+template <class T> struct remove_reference<T &&> : cpp::type_identity<T> {};
+template <class T>
+using remove_reference_t = typename remove_reference<T>::type;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_REMOVE_REFERENCE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/true_type.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/true_type.h
new file mode 100644
index 000000000000..55f8a535d03f
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/true_type.h
@@ -0,0 +1,23 @@
+//===-- true_type type_traits -----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_TRUE_TYPE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_TRUE_TYPE_H
+
+#include "src/__support/CPP/type_traits/bool_constant.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// true_type
+using true_type = cpp::bool_constant<true>;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_TRUE_TYPE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/type_identity.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/type_identity.h
new file mode 100644
index 000000000000..304a1ed2cea3
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/type_identity.h
@@ -0,0 +1,24 @@
+//===-- type_identity type_traits -------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_TYPE_IDENTITY_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_TYPE_IDENTITY_H
+
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// type_identity
+template <typename T> struct type_identity {
+  using type = T;
+};
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_TYPE_IDENTITY_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/type_traits/void_t.h b/contrib/llvm-project/libc/src/__support/CPP/type_traits/void_t.h
new file mode 100644
index 000000000000..9018860a83a2
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/type_traits/void_t.h
@@ -0,0 +1,29 @@
+//===-- void_t type_traits --------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_VOID_T_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_VOID_T_H
+
+#include "src/__support/CPP/type_traits/type_identity.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// void_t
+
+namespace detail {
+template <typename... Ts> struct make_void : cpp::type_identity<void> {};
+} // namespace detail
+
+template <typename... Ts>
+using void_t = typename detail::make_void<Ts...>::type;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_TYPE_TRAITS_VOID_T_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/utility.h b/contrib/llvm-project/libc/src/__support/CPP/utility.h
new file mode 100644
index 000000000000..083b4877c392
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/utility.h
@@ -0,0 +1,18 @@
+//===-- Analogous to <utility> ----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_H
+
+#include "src/__support/CPP/utility/declval.h"
+#include "src/__support/CPP/utility/forward.h"
+#include "src/__support/CPP/utility/in_place.h"
+#include "src/__support/CPP/utility/integer_sequence.h"
+#include "src/__support/CPP/utility/move.h"
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/utility/declval.h b/contrib/llvm-project/libc/src/__support/CPP/utility/declval.h
new file mode 100644
index 000000000000..9b963b92204f
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/utility/declval.h
@@ -0,0 +1,27 @@
+//===-- declval utility -----------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_DECLVAL_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_DECLVAL_H
+
+#include "src/__support/CPP/type_traits/add_rvalue_reference.h"
+#include "src/__support/CPP/type_traits/always_false.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// declval
+template <typename T> cpp::add_rvalue_reference_t<T> declval() {
+  static_assert(cpp::always_false<T>,
+                "declval not allowed in an evaluated context");
+}
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_DECLVAL_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/utility/forward.h b/contrib/llvm-project/libc/src/__support/CPP/utility/forward.h
new file mode 100644
index 000000000000..085b3d16f999
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/utility/forward.h
@@ -0,0 +1,35 @@
+//===-- forward utility -----------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_FORWARD_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_FORWARD_H
+
+#include "src/__support/CPP/type_traits/is_lvalue_reference.h"
+#include "src/__support/CPP/type_traits/remove_reference.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// forward
+template <typename T>
+LIBC_INLINE constexpr T &&forward(remove_reference_t<T> &value) {
+  return static_cast<T &&>(value);
+}
+
+template <typename T>
+LIBC_INLINE constexpr T &&forward(remove_reference_t<T> &&value) {
+  static_assert(!is_lvalue_reference_v<T>,
+                "cannot forward an rvalue as an lvalue");
+  return static_cast<T &&>(value);
+}
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_FORWARD_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/utility/in_place.h b/contrib/llvm-project/libc/src/__support/CPP/utility/in_place.h
new file mode 100644
index 000000000000..3967eb1c535e
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/utility/in_place.h
@@ -0,0 +1,39 @@
+//===-- in_place utility ----------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_IN_PLACE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_IN_PLACE_H
+
+#include "src/__support/macros/attributes.h" // LIBC_INLINE, LIBC_INLINE_VAR
+#include "src/__support/macros/config.h"
+
+#include <stddef.h> // size_t
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// in_place
+struct in_place_t {
+  LIBC_INLINE explicit in_place_t() = default;
+};
+LIBC_INLINE_VAR constexpr in_place_t in_place{};
+
+template <class T> struct in_place_type_t {
+  LIBC_INLINE explicit in_place_type_t() = default;
+};
+template <class T> LIBC_INLINE_VAR constexpr in_place_type_t<T> in_place_type{};
+
+template <size_t IDX> struct in_place_index_t {
+  LIBC_INLINE explicit in_place_index_t() = default;
+};
+template <size_t IDX>
+LIBC_INLINE_VAR constexpr in_place_index_t<IDX> in_place_index{};
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_IN_PLACE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/utility/integer_sequence.h b/contrib/llvm-project/libc/src/__support/CPP/utility/integer_sequence.h
new file mode 100644
index 000000000000..06643d505aca
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/utility/integer_sequence.h
@@ -0,0 +1,40 @@
+//===-- integer_sequence utility --------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_INTEGER_SEQUENCE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_INTEGER_SEQUENCE_H
+
+#include "src/__support/CPP/type_traits/is_integral.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// integer_sequence
+template <typename T, T... Ints> struct integer_sequence {
+  static_assert(cpp::is_integral_v<T>);
+  template <T Next> using append = integer_sequence<T, Ints..., Next>;
+};
+
+namespace detail {
+template <typename T, int N> struct make_integer_sequence {
+  using type =
+      typename make_integer_sequence<T, N - 1>::type::template append<N>;
+};
+template <typename T> struct make_integer_sequence<T, -1> {
+  using type = integer_sequence<T>;
+};
+} // namespace detail
+
+template <typename T, int N>
+using make_integer_sequence =
+    typename detail::make_integer_sequence<T, N - 1>::type;
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_INTEGER_SEQUENCE_H
diff --git a/contrib/llvm-project/libc/src/__support/CPP/utility/move.h b/contrib/llvm-project/libc/src/__support/CPP/utility/move.h
new file mode 100644
index 000000000000..b61f723e8d4c
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/CPP/utility/move.h
@@ -0,0 +1,27 @@
+//===-- move utility --------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_MOVE_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_MOVE_H
+
+#include "src/__support/CPP/type_traits/remove_reference.h"
+#include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+// move
+template <class T>
+LIBC_INLINE constexpr cpp::remove_reference_t<T> &&move(T &&t) {
+  return static_cast<typename cpp::remove_reference_t<T> &&>(t);
+}
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_MOVE_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/BasicOperations.h b/contrib/llvm-project/libc/src/__support/FPUtil/BasicOperations.h
new file mode 100644
index 000000000000..2357b053b60b
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/BasicOperations.h
@@ -0,0 +1,396 @@
+//===-- Basic operations on floating point numbers --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_BASICOPERATIONS_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_BASICOPERATIONS_H
+
+#include "FEnvImpl.h"
+#include "FPBits.h"
+#include "dyadic_float.h"
+
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/big_int.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
+#include "src/__support/macros/properties/architectures.h"
+#include "src/__support/macros/properties/types.h"
+#include "src/__support/uint128.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T abs(T x) {
+  return FPBits<T>(x).abs().get_val();
+}
+
+namespace internal {
+
+template <typename T>
+LIBC_INLINE cpp::enable_if_t<cpp::is_floating_point_v<T>, T> max(T x, T y) {
+  FPBits<T> x_bits(x);
+  FPBits<T> y_bits(y);
+
+  // To make sure that fmax(+0, -0) == +0 == fmax(-0, +0), whenever x and y
+  // have different signs and both are not NaNs, we return the number with
+  // positive sign.
+  if (x_bits.sign() != y_bits.sign())
+    return x_bits.is_pos() ? x : y;
+  return x > y ? x : y;
+}
+
+#ifdef LIBC_TYPES_HAS_FLOAT16
+#if defined(__LIBC_USE_BUILTIN_FMAXF16_FMINF16)
+template <> LIBC_INLINE float16 max(float16 x, float16 y) {
+  return __builtin_fmaxf16(x, y);
+}
+#elif !defined(LIBC_TARGET_ARCH_IS_AARCH64)
+template <> LIBC_INLINE float16 max(float16 x, float16 y) {
+  FPBits<float16> x_bits(x);
+  FPBits<float16> y_bits(y);
+
+  int16_t xi = static_cast<int16_t>(x_bits.uintval());
+  int16_t yi = static_cast<int16_t>(y_bits.uintval());
+  return ((xi > yi) != (xi < 0 && yi < 0)) ? x : y;
+}
+#endif
+#endif // LIBC_TYPES_HAS_FLOAT16
+
+#if defined(__LIBC_USE_BUILTIN_FMAX_FMIN) && !defined(LIBC_TARGET_ARCH_IS_X86)
+template <> LIBC_INLINE float max(float x, float y) {
+  return __builtin_fmaxf(x, y);
+}
+
+template <> LIBC_INLINE double max(double x, double y) {
+  return __builtin_fmax(x, y);
+}
+#endif
+
+template <typename T>
+LIBC_INLINE cpp::enable_if_t<cpp::is_floating_point_v<T>, T> min(T x, T y) {
+  FPBits<T> x_bits(x);
+  FPBits<T> y_bits(y);
+
+  // To make sure that fmin(+0, -0) == -0 == fmin(-0, +0), whenever x and y have
+  // different signs and both are not NaNs, we return the number with negative
+  // sign.
+  if (x_bits.sign() != y_bits.sign())
+    return x_bits.is_neg() ? x : y;
+  return x < y ? x : y;
+}
+
+#ifdef LIBC_TYPES_HAS_FLOAT16
+#if defined(__LIBC_USE_BUILTIN_FMAXF16_FMINF16)
+template <> LIBC_INLINE float16 min(float16 x, float16 y) {
+  return __builtin_fminf16(x, y);
+}
+#elif !defined(LIBC_TARGET_ARCH_IS_AARCH64)
+template <> LIBC_INLINE float16 min(float16 x, float16 y) {
+  FPBits<float16> x_bits(x);
+  FPBits<float16> y_bits(y);
+
+  int16_t xi = static_cast<int16_t>(x_bits.uintval());
+  int16_t yi = static_cast<int16_t>(y_bits.uintval());
+  return ((xi < yi) != (xi < 0 && yi < 0)) ? x : y;
+}
+#endif
+#endif // LIBC_TYPES_HAS_FLOAT16
+
+#if defined(__LIBC_USE_BUILTIN_FMAX_FMIN) && !defined(LIBC_TARGET_ARCH_IS_X86)
+template <> LIBC_INLINE float min(float x, float y) {
+  return __builtin_fminf(x, y);
+}
+
+template <> LIBC_INLINE double min(double x, double y) {
+  return __builtin_fmin(x, y);
+}
+#endif
+
+} // namespace internal
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T fmin(T x, T y) {
+  const FPBits<T> bitx(x), bity(y);
+
+  if (bitx.is_nan())
+    return y;
+  if (bity.is_nan())
+    return x;
+  return internal::min(x, y);
+}
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T fmax(T x, T y) {
+  FPBits<T> bitx(x), bity(y);
+
+  if (bitx.is_nan())
+    return y;
+  if (bity.is_nan())
+    return x;
+  return internal::max(x, y);
+}
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T fmaximum(T x, T y) {
+  FPBits<T> bitx(x), bity(y);
+
+  if (bitx.is_nan())
+    return x;
+  if (bity.is_nan())
+    return y;
+  return internal::max(x, y);
+}
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T fminimum(T x, T y) {
+  const FPBits<T> bitx(x), bity(y);
+
+  if (bitx.is_nan())
+    return x;
+  if (bity.is_nan())
+    return y;
+  return internal::min(x, y);
+}
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T fmaximum_num(T x, T y) {
+  FPBits<T> bitx(x), bity(y);
+  if (bitx.is_signaling_nan() || bity.is_signaling_nan()) {
+    fputil::raise_except_if_required(FE_INVALID);
+    if (bitx.is_nan() && bity.is_nan())
+      return FPBits<T>::quiet_nan().get_val();
+  }
+  if (bitx.is_nan())
+    return y;
+  if (bity.is_nan())
+    return x;
+  return internal::max(x, y);
+}
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T fminimum_num(T x, T y) {
+  FPBits<T> bitx(x), bity(y);
+  if (bitx.is_signaling_nan() || bity.is_signaling_nan()) {
+    fputil::raise_except_if_required(FE_INVALID);
+    if (bitx.is_nan() && bity.is_nan())
+      return FPBits<T>::quiet_nan().get_val();
+  }
+  if (bitx.is_nan())
+    return y;
+  if (bity.is_nan())
+    return x;
+  return internal::min(x, y);
+}
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T fmaximum_mag(T x, T y) {
+  FPBits<T> bitx(x), bity(y);
+
+  if (abs(x) > abs(y))
+    return x;
+  if (abs(y) > abs(x))
+    return y;
+  return fmaximum(x, y);
+}
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T fminimum_mag(T x, T y) {
+  FPBits<T> bitx(x), bity(y);
+
+  if (abs(x) < abs(y))
+    return x;
+  if (abs(y) < abs(x))
+    return y;
+  return fminimum(x, y);
+}
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T fmaximum_mag_num(T x, T y) {
+  FPBits<T> bitx(x), bity(y);
+
+  if (abs(x) > abs(y))
+    return x;
+  if (abs(y) > abs(x))
+    return y;
+  return fmaximum_num(x, y);
+}
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T fminimum_mag_num(T x, T y) {
+  FPBits<T> bitx(x), bity(y);
+
+  if (abs(x) < abs(y))
+    return x;
+  if (abs(y) < abs(x))
+    return y;
+  return fminimum_num(x, y);
+}
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T fdim(T x, T y) {
+  FPBits<T> bitx(x), bity(y);
+
+  if (bitx.is_nan()) {
+    return x;
+  }
+
+  if (bity.is_nan()) {
+    return y;
+  }
+
+  return (x > y ? x - y : 0);
+}
+
+// Avoid reusing `issignaling` macro.
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE int issignaling_impl(const T &x) {
+  FPBits<T> sx(x);
+  return sx.is_signaling_nan();
+}
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE int canonicalize(T &cx, const T &x) {
+  FPBits<T> sx(x);
+  if constexpr (get_fp_type<T>() == FPType::X86_Binary80) {
+    // All the pseudo and unnormal numbers are not canonical.
+    // More precisely :
+    // Exponent   |       Significand      | Meaning
+    //            | Bits 63-62 | Bits 61-0 |
+    // All Ones   |     00     |    Zero   | Pseudo Infinity, Value = SNaN
+    // All Ones   |     00     |  Non-Zero | Pseudo NaN, Value = SNaN
+    // All Ones   |     01     | Anything  | Pseudo NaN, Value = SNaN
+    //            |   Bit 63   | Bits 62-0 |
+    // All zeroes |   One      | Anything  | Pseudo Denormal, Value =
+    //            |            |           | (−1)**s × m × 2**−16382
+    // All Other  |   Zero     | Anything  | Unnormal, Value = SNaN
+    //  Values    |            |           |
+    bool bit63 = sx.get_implicit_bit();
+    UInt128 mantissa = sx.get_explicit_mantissa();
+    bool bit62 = static_cast<bool>((mantissa & (1ULL << 62)) >> 62);
+    int exponent = sx.get_biased_exponent();
+    if (exponent == 0x7FFF) {
+      if (!bit63 && !bit62) {
+        if (mantissa == 0) {
+          cx = FPBits<T>::quiet_nan(sx.sign(), mantissa).get_val();
+          raise_except_if_required(FE_INVALID);
+          return 1;
+        }
+        cx = FPBits<T>::quiet_nan(sx.sign(), mantissa).get_val();
+        raise_except_if_required(FE_INVALID);
+        return 1;
+      } else if (!bit63 && bit62) {
+        cx = FPBits<T>::quiet_nan(sx.sign(), mantissa).get_val();
+        raise_except_if_required(FE_INVALID);
+        return 1;
+      } else if (LIBC_UNLIKELY(sx.is_signaling_nan())) {
+        cx = FPBits<T>::quiet_nan(sx.sign(), sx.get_explicit_mantissa())
+                 .get_val();
+        raise_except_if_required(FE_INVALID);
+        return 1;
+      } else
+        cx = x;
+    } else if (exponent == 0 && bit63)
+      cx = FPBits<T>::make_value(mantissa, 0).get_val();
+    else if (exponent != 0 && !bit63) {
+      cx = FPBits<T>::quiet_nan(sx.sign(), mantissa).get_val();
+      raise_except_if_required(FE_INVALID);
+      return 1;
+    } else if (LIBC_UNLIKELY(sx.is_signaling_nan())) {
+      cx =
+          FPBits<T>::quiet_nan(sx.sign(), sx.get_explicit_mantissa()).get_val();
+      raise_except_if_required(FE_INVALID);
+      return 1;
+    } else
+      cx = x;
+  } else if (LIBC_UNLIKELY(sx.is_signaling_nan())) {
+    cx = FPBits<T>::quiet_nan(sx.sign(), sx.get_explicit_mantissa()).get_val();
+    raise_except_if_required(FE_INVALID);
+    return 1;
+  } else
+    cx = x;
+  return 0;
+}
+
+template <typename T>
+LIBC_INLINE cpp::enable_if_t<cpp::is_floating_point_v<T>, bool>
+totalorder(T x, T y) {
+  using FPBits = FPBits<T>;
+  FPBits x_bits(x);
+  FPBits y_bits(y);
+
+  using StorageType = typename FPBits::StorageType;
+  StorageType x_u = x_bits.uintval();
+  StorageType y_u = y_bits.uintval();
+
+  bool has_neg = ((x_u | y_u) & FPBits::SIGN_MASK) != 0;
+  return x_u == y_u || ((x_u < y_u) != has_neg);
+}
+
+template <typename T>
+LIBC_INLINE cpp::enable_if_t<cpp::is_floating_point_v<T>, bool>
+totalordermag(T x, T y) {
+  return FPBits<T>(x).abs().uintval() <= FPBits<T>(y).abs().uintval();
+}
+
+template <typename T>
+LIBC_INLINE cpp::enable_if_t<cpp::is_floating_point_v<T>, T> getpayload(T x) {
+  using FPBits = FPBits<T>;
+  using StorageType = typename FPBits::StorageType;
+  FPBits x_bits(x);
+
+  if (!x_bits.is_nan())
+    return T(-1.0);
+
+  StorageType payload = x_bits.uintval() & (FPBits::FRACTION_MASK >> 1);
+
+  if constexpr (is_big_int_v<StorageType>) {
+    DyadicFloat<FPBits::STORAGE_LEN> payload_dfloat(Sign::POS, 0, payload);
+
+    return static_cast<T>(payload_dfloat);
+  } else {
+    return static_cast<T>(payload);
+  }
+}
+
+template <bool IsSignaling, typename T>
+LIBC_INLINE cpp::enable_if_t<cpp::is_floating_point_v<T>, bool>
+setpayload(T &res, T pl) {
+  using FPBits = FPBits<T>;
+  FPBits pl_bits(pl);
+
+  // Signaling NaNs don't have the mantissa's MSB set to 1, so they need a
+  // non-zero payload to distinguish them from infinities.
+  if (!IsSignaling && pl_bits.is_zero()) {
+    res = FPBits::quiet_nan(Sign::POS).get_val();
+    return false;
+  }
+
+  int pl_exp = pl_bits.get_exponent();
+
+  if (pl_bits.is_neg() || pl_exp < 0 || pl_exp >= FPBits::FRACTION_LEN - 1 ||
+      ((pl_bits.get_mantissa() << pl_exp) & FPBits::FRACTION_MASK) != 0) {
+    res = T(0.0);
+    return true;
+  }
+
+  using StorageType = typename FPBits::StorageType;
+  StorageType v(pl_bits.get_explicit_mantissa() >>
+                (FPBits::FRACTION_LEN - pl_exp));
+
+  if constexpr (IsSignaling)
+    res = FPBits::signaling_nan(Sign::POS, v).get_val();
+  else
+    res = FPBits::quiet_nan(Sign::POS, v).get_val();
+  return false;
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_BASICOPERATIONS_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/DivisionAndRemainderOperations.h b/contrib/llvm-project/libc/src/__support/FPUtil/DivisionAndRemainderOperations.h
new file mode 100644
index 000000000000..fda33875f25b
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/DivisionAndRemainderOperations.h
@@ -0,0 +1,121 @@
+//===-- Floating point divsion and remainder operations ---------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_DIVISIONANDREMAINDEROPERATIONS_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_DIVISIONANDREMAINDEROPERATIONS_H
+
+#include "FPBits.h"
+#include "ManipulationFunctions.h"
+#include "NormalFloat.h"
+
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+static constexpr int QUOTIENT_LSB_BITS = 3;
+
+// The implementation is a bit-by-bit algorithm which uses integer division
+// to evaluate the quotient and remainder.
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T remquo(T x, T y, int &q) {
+  FPBits<T> xbits(x), ybits(y);
+  if (xbits.is_nan())
+    return x;
+  if (ybits.is_nan())
+    return y;
+  if (xbits.is_inf() || ybits.is_zero())
+    return FPBits<T>::quiet_nan().get_val();
+
+  if (xbits.is_zero()) {
+    q = 0;
+    return LIBC_NAMESPACE::fputil::copysign(T(0.0), x);
+  }
+
+  if (ybits.is_inf()) {
+    q = 0;
+    return x;
+  }
+
+  const Sign result_sign =
+      (xbits.sign() == ybits.sign() ? Sign::POS : Sign::NEG);
+
+  // Once we know the sign of the result, we can just operate on the absolute
+  // values. The correct sign can be applied to the result after the result
+  // is evaluated.
+  xbits.set_sign(Sign::POS);
+  ybits.set_sign(Sign::POS);
+
+  NormalFloat<T> normalx(xbits), normaly(ybits);
+  int exp = normalx.exponent - normaly.exponent;
+  typename NormalFloat<T>::StorageType mx = normalx.mantissa,
+                                       my = normaly.mantissa;
+
+  q = 0;
+  while (exp >= 0) {
+    unsigned shift_count = 0;
+    typename NormalFloat<T>::StorageType n = mx;
+    for (shift_count = 0; n < my; n <<= 1, ++shift_count)
+      ;
+
+    if (static_cast<int>(shift_count) > exp)
+      break;
+
+    exp -= shift_count;
+    if (0 <= exp && exp < QUOTIENT_LSB_BITS)
+      q |= (1 << exp);
+
+    mx = n - my;
+    if (mx == 0) {
+      q = result_sign.is_neg() ? -q : q;
+      return LIBC_NAMESPACE::fputil::copysign(T(0.0), x);
+    }
+  }
+
+  NormalFloat<T> remainder(Sign::POS, exp + normaly.exponent, mx);
+
+  // Since NormalFloat to native type conversion is a truncation operation
+  // currently, the remainder value in the native type is correct as is.
+  // However, if NormalFloat to native type conversion is updated in future,
+  // then the conversion to native remainder value should be updated
+  // appropriately and some directed tests added.
+  T native_remainder(remainder);
+  T absy = ybits.get_val();
+  int cmp = remainder.mul2(1).cmp(normaly);
+  if (cmp > 0) {
+    q = q + 1;
+    if (x >= T(0.0))
+      native_remainder = native_remainder - absy;
+    else
+      native_remainder = absy - native_remainder;
+  } else if (cmp == 0) {
+    if (q & 1) {
+      q += 1;
+      if (x >= T(0.0))
+        native_remainder = -native_remainder;
+    } else {
+      if (x < T(0.0))
+        native_remainder = -native_remainder;
+    }
+  } else {
+    if (x < T(0.0))
+      native_remainder = -native_remainder;
+  }
+
+  q = result_sign.is_neg() ? -q : q;
+  if (native_remainder == T(0.0))
+    return LIBC_NAMESPACE::fputil::copysign(T(0.0), x);
+  return native_remainder;
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_DIVISIONANDREMAINDEROPERATIONS_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/FEnvImpl.h b/contrib/llvm-project/libc/src/__support/FPUtil/FEnvImpl.h
new file mode 100644
index 000000000000..76910880eb81
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/FEnvImpl.h
@@ -0,0 +1,114 @@
+//===-- Floating point environment manipulation functions -------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_FENVIMPL_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_FENVIMPL_H
+
+#include "hdr/fenv_macros.h"
+#include "hdr/math_macros.h"
+#include "hdr/types/fenv_t.h"
+#include "src/__support/libc_errno.h"
+#include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h"
+#include "src/__support/macros/properties/architectures.h"
+
+#if defined(LIBC_TARGET_ARCH_IS_AARCH64) && defined(__ARM_FP)
+#if defined(__APPLE__)
+#include "aarch64/fenv_darwin_impl.h"
+#else
+#include "aarch64/FEnvImpl.h"
+#endif
+
+// The extra !defined(APPLE) condition is to cause x86_64 MacOS builds to use
+// the dummy implementations below. Once a proper x86_64 darwin fenv is set up,
+// the apple condition here should be removed.
+#elif defined(LIBC_TARGET_ARCH_IS_X86) && !defined(__APPLE__)
+#include "x86_64/FEnvImpl.h"
+#elif defined(LIBC_TARGET_ARCH_IS_ARM) && defined(__ARM_FP)
+#include "arm/FEnvImpl.h"
+#elif defined(LIBC_TARGET_ARCH_IS_ANY_RISCV) && defined(__riscv_flen)
+#include "riscv/FEnvImpl.h"
+#else
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+// All dummy functions silently succeed.
+
+LIBC_INLINE int clear_except(int) { return 0; }
+
+LIBC_INLINE int test_except(int) { return 0; }
+
+LIBC_INLINE int get_except() { return 0; }
+
+LIBC_INLINE int set_except(int) { return 0; }
+
+LIBC_INLINE int raise_except(int) { return 0; }
+
+LIBC_INLINE int enable_except(int) { return 0; }
+
+LIBC_INLINE int disable_except(int) { return 0; }
+
+LIBC_INLINE int get_round() { return FE_TONEAREST; }
+
+LIBC_INLINE int set_round(int rounding_mode) {
+  return (rounding_mode == FE_TONEAREST) ? 0 : 1;
+}
+
+LIBC_INLINE int get_env(fenv_t *) { return 0; }
+
+LIBC_INLINE int set_env(const fenv_t *) { return 0; }
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+#endif
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+LIBC_INLINE static int clear_except_if_required([[maybe_unused]] int excepts) {
+#ifndef LIBC_MATH_HAS_NO_EXCEPT
+  if (math_errhandling & MATH_ERREXCEPT)
+    return clear_except(excepts);
+#endif // LIBC_MATH_HAS_NO_EXCEPT
+  return 0;
+}
+
+LIBC_INLINE static int set_except_if_required([[maybe_unused]] int excepts) {
+#ifndef LIBC_MATH_HAS_NO_EXCEPT
+  if (math_errhandling & MATH_ERREXCEPT)
+    return set_except(excepts);
+#endif // LIBC_MATH_HAS_NO_EXCEPT
+  return 0;
+}
+
+LIBC_INLINE static int raise_except_if_required([[maybe_unused]] int excepts) {
+#ifndef LIBC_MATH_HAS_NO_EXCEPT
+  if (math_errhandling & MATH_ERREXCEPT)
+#ifdef LIBC_TARGET_ARCH_IS_X86_64
+    return raise_except</*SKIP_X87_FPU*/ true>(excepts);
+#else  // !LIBC_TARGET_ARCH_IS_X86
+    return raise_except(excepts);
+#endif // LIBC_TARGET_ARCH_IS_X86
+
+#endif // LIBC_MATH_HAS_NO_EXCEPT
+  return 0;
+}
+
+LIBC_INLINE static void set_errno_if_required([[maybe_unused]] int err) {
+#ifndef LIBC_MATH_HAS_NO_ERRNO
+  if (math_errhandling & MATH_ERRNO)
+    libc_errno = err;
+#endif // LIBC_MATH_HAS_NO_ERRNO
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_FENVIMPL_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/FMA.h b/contrib/llvm-project/libc/src/__support/FPUtil/FMA.h
new file mode 100644
index 000000000000..2cafb4c0974e
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/FMA.h
@@ -0,0 +1,52 @@
+//===-- Common header for FMA implementations -------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_FMA_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_FMA_H
+
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/FPUtil/generic/FMA.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+#include "src/__support/macros/properties/cpu_features.h" // LIBC_TARGET_CPU_HAS_FMA
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+template <typename OutType, typename InType>
+LIBC_INLINE OutType fma(InType x, InType y, InType z) {
+  return generic::fma<OutType>(x, y, z);
+}
+
+#ifdef LIBC_TARGET_CPU_HAS_FMA
+
+#ifdef LIBC_TARGET_CPU_HAS_FMA_FLOAT
+template <> LIBC_INLINE float fma(float x, float y, float z) {
+#if __has_builtin(__builtin_elementwise_fma)
+  return __builtin_elementwise_fma(x, y, z);
+#else
+  return __builtin_fmaf(x, y, z);
+#endif
+}
+#endif // LIBC_TARGET_CPU_HAS_FMA_FLOAT
+
+#ifdef LIBC_TARGET_CPU_HAS_FMA_DOUBLE
+template <> LIBC_INLINE double fma(double x, double y, double z) {
+#if __has_builtin(__builtin_elementwise_fma)
+  return __builtin_elementwise_fma(x, y, z);
+#else
+  return __builtin_fma(x, y, z);
+#endif
+}
+#endif // LIBC_TARGET_CPU_HAS_FMA_DOUBLE
+#endif // LIBC_TARGET_CPU_HAS_FMA
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_FMA_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/FPBits.h b/contrib/llvm-project/libc/src/__support/FPUtil/FPBits.h
new file mode 100644
index 000000000000..9e21136558a0
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/FPBits.h
@@ -0,0 +1,857 @@
+//===-- Abstract class for bit manipulation of float numbers. ---*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// -----------------------------------------------------------------------------
+//                               **** WARNING ****
+// This file is shared with libc++. You should also be careful when adding
+// dependencies to this file, since it needs to build for all libc++ targets.
+// -----------------------------------------------------------------------------
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_FPBITS_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_FPBITS_H
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/common.h"
+#include "src/__support/libc_assert.h"       // LIBC_ASSERT
+#include "src/__support/macros/attributes.h" // LIBC_INLINE, LIBC_INLINE_VAR
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_FLOAT128
+#include "src/__support/math_extras.h"             // mask_trailing_ones
+#include "src/__support/sign.h"                    // Sign
+#include "src/__support/uint128.h"
+
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+// The supported floating point types.
+enum class FPType {
+  IEEE754_Binary16,
+  IEEE754_Binary32,
+  IEEE754_Binary64,
+  IEEE754_Binary128,
+  X86_Binary80,
+  BFloat16
+};
+
+// The classes hierarchy is as follows:
+//
+//             ┌───────────────────┐
+//             │ FPLayout<FPType>  │
+//             └─────────▲─────────┘
+//                       │
+//             ┌─────────┴─────────┐
+//             │ FPStorage<FPType> │
+//             └─────────▲─────────┘
+//                       │
+//          ┌────────────┴─────────────┐
+//          │                          │
+// ┌────────┴─────────┐ ┌──────────────┴──────────────────┐
+// │ FPRepSem<FPType> │ │  FPRepSem<FPType::X86_Binary80  │
+// └────────▲─────────┘ └──────────────▲──────────────────┘
+//          │                          │
+//          └────────────┬─────────────┘
+//                       │
+//               ┌───────┴───────┐
+//               │  FPRepImpl<T> │
+//               └───────▲───────┘
+//                       │
+//              ┌────────┴────────┐
+//        ┌─────┴─────┐     ┌─────┴─────┐
+//        │  FPRep<T> │     │ FPBits<T> │
+//        └───────────┘     └───────────┘
+//
+// - 'FPLayout' defines only a few constants, namely the 'StorageType' and
+//   length of the sign, the exponent, fraction and significand parts.
+// - 'FPStorage' builds more constants on top of those from 'FPLayout' like
+//   exponent bias and masks. It also holds the bit representation of the
+//   floating point as a 'StorageType' type and defines tools to assemble or
+//   test these parts.
+// - 'FPRepSem' defines functions to interact semantically with the floating
+//   point representation. The default implementation is the one for 'IEEE754',
+//   a specialization is provided for X86 Extended Precision.
+// - 'FPRepImpl' derives from 'FPRepSem' and adds functions that are common to
+//   all implementations or build on the ones in 'FPRepSem'.
+// - 'FPRep' exposes all functions from 'FPRepImpl' and returns 'FPRep'
+//   instances when using Builders (static functions to create values).
+// - 'FPBits' exposes all the functions from 'FPRepImpl' but operates on the
+//   native C++ floating point type instead of 'FPType'. An additional 'get_val'
+//   function allows getting the C++ floating point type value back. Builders
+//   called from 'FPBits' return 'FPBits' instances.
+
+namespace internal {
+
+// Defines the layout (sign, exponent, significand) of a floating point type in
+// memory. It also defines its associated StorageType, i.e., the unsigned
+// integer type used to manipulate its representation.
+// Additionally we provide the fractional part length, i.e., the number of bits
+// after the decimal dot when the number is in normal form.
+template <FPType> struct FPLayout {};
+
+template <> struct FPLayout<FPType::IEEE754_Binary16> {
+  using StorageType = uint16_t;
+  LIBC_INLINE_VAR static constexpr int SIGN_LEN = 1;
+  LIBC_INLINE_VAR static constexpr int EXP_LEN = 5;
+  LIBC_INLINE_VAR static constexpr int SIG_LEN = 10;
+  LIBC_INLINE_VAR static constexpr int FRACTION_LEN = SIG_LEN;
+};
+
+template <> struct FPLayout<FPType::IEEE754_Binary32> {
+  using StorageType = uint32_t;
+  LIBC_INLINE_VAR static constexpr int SIGN_LEN = 1;
+  LIBC_INLINE_VAR static constexpr int EXP_LEN = 8;
+  LIBC_INLINE_VAR static constexpr int SIG_LEN = 23;
+  LIBC_INLINE_VAR static constexpr int FRACTION_LEN = SIG_LEN;
+};
+
+template <> struct FPLayout<FPType::IEEE754_Binary64> {
+  using StorageType = uint64_t;
+  LIBC_INLINE_VAR static constexpr int SIGN_LEN = 1;
+  LIBC_INLINE_VAR static constexpr int EXP_LEN = 11;
+  LIBC_INLINE_VAR static constexpr int SIG_LEN = 52;
+  LIBC_INLINE_VAR static constexpr int FRACTION_LEN = SIG_LEN;
+};
+
+template <> struct FPLayout<FPType::IEEE754_Binary128> {
+  using StorageType = UInt128;
+  LIBC_INLINE_VAR static constexpr int SIGN_LEN = 1;
+  LIBC_INLINE_VAR static constexpr int EXP_LEN = 15;
+  LIBC_INLINE_VAR static constexpr int SIG_LEN = 112;
+  LIBC_INLINE_VAR static constexpr int FRACTION_LEN = SIG_LEN;
+};
+
+template <> struct FPLayout<FPType::X86_Binary80> {
+#if __SIZEOF_LONG_DOUBLE__ == 12
+  using StorageType = UInt<__SIZEOF_LONG_DOUBLE__ * CHAR_BIT>;
+#else
+  using StorageType = UInt128;
+#endif
+  LIBC_INLINE_VAR static constexpr int SIGN_LEN = 1;
+  LIBC_INLINE_VAR static constexpr int EXP_LEN = 15;
+  LIBC_INLINE_VAR static constexpr int SIG_LEN = 64;
+  LIBC_INLINE_VAR static constexpr int FRACTION_LEN = SIG_LEN - 1;
+};
+
+template <> struct FPLayout<FPType::BFloat16> {
+  using StorageType = uint16_t;
+  LIBC_INLINE_VAR static constexpr int SIGN_LEN = 1;
+  LIBC_INLINE_VAR static constexpr int EXP_LEN = 8;
+  LIBC_INLINE_VAR static constexpr int SIG_LEN = 7;
+  LIBC_INLINE_VAR static constexpr int FRACTION_LEN = SIG_LEN;
+};
+
+// FPStorage derives useful constants from the FPLayout above.
+template <FPType fp_type> struct FPStorage : public FPLayout<fp_type> {
+  using UP = FPLayout<fp_type>;
+
+  using UP::EXP_LEN;  // The number of bits for the *exponent* part
+  using UP::SIG_LEN;  // The number of bits for the *significand* part
+  using UP::SIGN_LEN; // The number of bits for the *sign* part
+  // For convenience, the sum of `SIG_LEN`, `EXP_LEN`, and `SIGN_LEN`.
+  LIBC_INLINE_VAR static constexpr int TOTAL_LEN = SIGN_LEN + EXP_LEN + SIG_LEN;
+
+  // The number of bits after the decimal dot when the number is in normal form.
+  using UP::FRACTION_LEN;
+
+  // An unsigned integer that is wide enough to contain all of the floating
+  // point bits.
+  using StorageType = typename UP::StorageType;
+
+  // The number of bits in StorageType.
+  LIBC_INLINE_VAR static constexpr int STORAGE_LEN =
+      sizeof(StorageType) * CHAR_BIT;
+  static_assert(STORAGE_LEN >= TOTAL_LEN);
+
+  // The exponent bias. Always positive.
+  LIBC_INLINE_VAR static constexpr int32_t EXP_BIAS =
+      (1U << (EXP_LEN - 1U)) - 1U;
+  static_assert(EXP_BIAS > 0);
+
+  // The bit pattern that keeps only the *significand* part.
+  LIBC_INLINE_VAR static constexpr StorageType SIG_MASK =
+      mask_trailing_ones<StorageType, SIG_LEN>();
+  // The bit pattern that keeps only the *exponent* part.
+  LIBC_INLINE_VAR static constexpr StorageType EXP_MASK =
+      mask_trailing_ones<StorageType, EXP_LEN>() << SIG_LEN;
+  // The bit pattern that keeps only the *sign* part.
+  LIBC_INLINE_VAR static constexpr StorageType SIGN_MASK =
+      mask_trailing_ones<StorageType, SIGN_LEN>() << (EXP_LEN + SIG_LEN);
+  // The bit pattern that keeps only the *exponent + significand* part.
+  LIBC_INLINE_VAR static constexpr StorageType EXP_SIG_MASK =
+      mask_trailing_ones<StorageType, EXP_LEN + SIG_LEN>();
+  // The bit pattern that keeps only the *sign + exponent + significand* part.
+  LIBC_INLINE_VAR static constexpr StorageType FP_MASK =
+      mask_trailing_ones<StorageType, TOTAL_LEN>();
+  // The bit pattern that keeps only the *fraction* part.
+  // i.e., the *significand* without the leading one.
+  LIBC_INLINE_VAR static constexpr StorageType FRACTION_MASK =
+      mask_trailing_ones<StorageType, FRACTION_LEN>();
+
+  static_assert((SIG_MASK & EXP_MASK & SIGN_MASK) == 0, "masks disjoint");
+  static_assert((SIG_MASK | EXP_MASK | SIGN_MASK) == FP_MASK, "masks cover");
+
+protected:
+  // Merge bits from 'a' and 'b' values according to 'mask'.
+  // Use 'a' bits when corresponding 'mask' bits are zeroes and 'b' bits when
+  // corresponding bits are ones.
+  LIBC_INLINE static constexpr StorageType merge(StorageType a, StorageType b,
+                                                 StorageType mask) {
+    // https://graphics.stanford.edu/~seander/bithacks.html#MaskedMerge
+    return a ^ ((a ^ b) & mask);
+  }
+
+  // A stongly typed integer that prevents mixing and matching integers with
+  // different semantics.
+  template <typename T> struct TypedInt {
+    using value_type = T;
+    LIBC_INLINE constexpr explicit TypedInt(T value) : value(value) {}
+    LIBC_INLINE constexpr TypedInt(const TypedInt &value) = default;
+    LIBC_INLINE constexpr TypedInt &operator=(const TypedInt &value) = default;
+
+    LIBC_INLINE constexpr explicit operator T() const { return value; }
+
+    LIBC_INLINE constexpr StorageType to_storage_type() const {
+      return StorageType(value);
+    }
+
+    LIBC_INLINE friend constexpr bool operator==(TypedInt a, TypedInt b) {
+      return a.value == b.value;
+    }
+    LIBC_INLINE friend constexpr bool operator!=(TypedInt a, TypedInt b) {
+      return a.value != b.value;
+    }
+
+  protected:
+    T value;
+  };
+
+  // An opaque type to store a floating point exponent.
+  // We define special values but it is valid to create arbitrary values as long
+  // as they are in the range [min, max].
+  struct Exponent : public TypedInt<int32_t> {
+    using UP = TypedInt<int32_t>;
+    using UP::UP;
+    LIBC_INLINE static constexpr auto subnormal() {
+      return Exponent(-EXP_BIAS);
+    }
+    LIBC_INLINE static constexpr auto min() { return Exponent(1 - EXP_BIAS); }
+    LIBC_INLINE static constexpr auto zero() { return Exponent(0); }
+    LIBC_INLINE static constexpr auto max() { return Exponent(EXP_BIAS); }
+    LIBC_INLINE static constexpr auto inf() { return Exponent(EXP_BIAS + 1); }
+  };
+
+  // An opaque type to store a floating point biased exponent.
+  // We define special values but it is valid to create arbitrary values as long
+  // as they are in the range [zero, bits_all_ones].
+  // Values greater than bits_all_ones are truncated.
+  struct BiasedExponent : public TypedInt<uint32_t> {
+    using UP = TypedInt<uint32_t>;
+    using UP::UP;
+
+    LIBC_INLINE constexpr BiasedExponent(Exponent exp)
+        : UP(static_cast<uint32_t>(static_cast<int32_t>(exp) + EXP_BIAS)) {}
+
+    // Cast operator to get convert from BiasedExponent to Exponent.
+    LIBC_INLINE constexpr operator Exponent() const {
+      return Exponent(static_cast<int32_t>(UP::value - EXP_BIAS));
+    }
+
+    LIBC_INLINE constexpr BiasedExponent &operator++() {
+      LIBC_ASSERT(*this != BiasedExponent(Exponent::inf()));
+      ++UP::value;
+      return *this;
+    }
+
+    LIBC_INLINE constexpr BiasedExponent &operator--() {
+      LIBC_ASSERT(*this != BiasedExponent(Exponent::subnormal()));
+      --UP::value;
+      return *this;
+    }
+  };
+
+  // An opaque type to store a floating point significand.
+  // We define special values but it is valid to create arbitrary values as long
+  // as they are in the range [zero, bits_all_ones].
+  // Note that the semantics of the Significand are implementation dependent.
+  // Values greater than bits_all_ones are truncated.
+  struct Significand : public TypedInt<StorageType> {
+    using UP = TypedInt<StorageType>;
+    using UP::UP;
+
+    LIBC_INLINE friend constexpr Significand operator|(const Significand a,
+                                                       const Significand b) {
+      return Significand(
+          StorageType(a.to_storage_type() | b.to_storage_type()));
+    }
+    LIBC_INLINE friend constexpr Significand operator^(const Significand a,
+                                                       const Significand b) {
+      return Significand(
+          StorageType(a.to_storage_type() ^ b.to_storage_type()));
+    }
+    LIBC_INLINE friend constexpr Significand operator>>(const Significand a,
+                                                        int shift) {
+      return Significand(StorageType(a.to_storage_type() >> shift));
+    }
+
+    LIBC_INLINE static constexpr auto zero() {
+      return Significand(StorageType(0));
+    }
+    LIBC_INLINE static constexpr auto lsb() {
+      return Significand(StorageType(1));
+    }
+    LIBC_INLINE static constexpr auto msb() {
+      return Significand(StorageType(1) << (SIG_LEN - 1));
+    }
+    LIBC_INLINE static constexpr auto bits_all_ones() {
+      return Significand(SIG_MASK);
+    }
+  };
+
+  LIBC_INLINE static constexpr StorageType encode(BiasedExponent exp) {
+    return (exp.to_storage_type() << SIG_LEN) & EXP_MASK;
+  }
+
+  LIBC_INLINE static constexpr StorageType encode(Significand value) {
+    return value.to_storage_type() & SIG_MASK;
+  }
+
+  LIBC_INLINE static constexpr StorageType encode(BiasedExponent exp,
+                                                  Significand sig) {
+    return encode(exp) | encode(sig);
+  }
+
+  LIBC_INLINE static constexpr StorageType encode(Sign sign, BiasedExponent exp,
+                                                  Significand sig) {
+    if (sign.is_neg())
+      return SIGN_MASK | encode(exp, sig);
+    return encode(exp, sig);
+  }
+
+  // The floating point number representation as an unsigned integer.
+  StorageType bits{};
+
+  LIBC_INLINE constexpr FPStorage() : bits(0) {}
+  LIBC_INLINE constexpr FPStorage(StorageType value) : bits(value) {}
+
+  // Observers
+  LIBC_INLINE constexpr StorageType exp_bits() const { return bits & EXP_MASK; }
+  LIBC_INLINE constexpr StorageType sig_bits() const { return bits & SIG_MASK; }
+  LIBC_INLINE constexpr StorageType exp_sig_bits() const {
+    return bits & EXP_SIG_MASK;
+  }
+
+  // Parts
+  LIBC_INLINE constexpr BiasedExponent biased_exponent() const {
+    return BiasedExponent(static_cast<uint32_t>(exp_bits() >> SIG_LEN));
+  }
+  LIBC_INLINE constexpr void set_biased_exponent(BiasedExponent biased) {
+    bits = merge(bits, encode(biased), EXP_MASK);
+  }
+
+public:
+  LIBC_INLINE constexpr Sign sign() const {
+    return (bits & SIGN_MASK) ? Sign::NEG : Sign::POS;
+  }
+  LIBC_INLINE constexpr void set_sign(Sign signVal) {
+    if (sign() != signVal)
+      bits ^= SIGN_MASK;
+  }
+};
+
+// This layer defines all functions that are specific to how the the floating
+// point type is encoded. It enables constructions, modification and observation
+// of values manipulated as 'StorageType'.
+template <FPType fp_type, typename RetT>
+struct FPRepSem : public FPStorage<fp_type> {
+  using UP = FPStorage<fp_type>;
+  using typename UP::StorageType;
+  using UP::FRACTION_LEN;
+  using UP::FRACTION_MASK;
+
+protected:
+  using typename UP::Exponent;
+  using typename UP::Significand;
+  using UP::bits;
+  using UP::encode;
+  using UP::exp_bits;
+  using UP::exp_sig_bits;
+  using UP::sig_bits;
+  using UP::UP;
+
+public:
+  // Builders
+  LIBC_INLINE static constexpr RetT zero(Sign sign = Sign::POS) {
+    return RetT(encode(sign, Exponent::subnormal(), Significand::zero()));
+  }
+  LIBC_INLINE static constexpr RetT one(Sign sign = Sign::POS) {
+    return RetT(encode(sign, Exponent::zero(), Significand::zero()));
+  }
+  LIBC_INLINE static constexpr RetT min_subnormal(Sign sign = Sign::POS) {
+    return RetT(encode(sign, Exponent::subnormal(), Significand::lsb()));
+  }
+  LIBC_INLINE static constexpr RetT max_subnormal(Sign sign = Sign::POS) {
+    return RetT(
+        encode(sign, Exponent::subnormal(), Significand::bits_all_ones()));
+  }
+  LIBC_INLINE static constexpr RetT min_normal(Sign sign = Sign::POS) {
+    return RetT(encode(sign, Exponent::min(), Significand::zero()));
+  }
+  LIBC_INLINE static constexpr RetT max_normal(Sign sign = Sign::POS) {
+    return RetT(encode(sign, Exponent::max(), Significand::bits_all_ones()));
+  }
+  LIBC_INLINE static constexpr RetT inf(Sign sign = Sign::POS) {
+    return RetT(encode(sign, Exponent::inf(), Significand::zero()));
+  }
+  LIBC_INLINE static constexpr RetT signaling_nan(Sign sign = Sign::POS,
+                                                  StorageType v = 0) {
+    return RetT(encode(sign, Exponent::inf(),
+                       (v ? Significand(v) : (Significand::msb() >> 1))));
+  }
+  LIBC_INLINE static constexpr RetT quiet_nan(Sign sign = Sign::POS,
+                                              StorageType v = 0) {
+    return RetT(
+        encode(sign, Exponent::inf(), Significand::msb() | Significand(v)));
+  }
+
+  // Observers
+  LIBC_INLINE constexpr bool is_zero() const { return exp_sig_bits() == 0; }
+  LIBC_INLINE constexpr bool is_nan() const {
+    return exp_sig_bits() > encode(Exponent::inf(), Significand::zero());
+  }
+  LIBC_INLINE constexpr bool is_quiet_nan() const {
+    return exp_sig_bits() >= encode(Exponent::inf(), Significand::msb());
+  }
+  LIBC_INLINE constexpr bool is_signaling_nan() const {
+    return is_nan() && !is_quiet_nan();
+  }
+  LIBC_INLINE constexpr bool is_inf() const {
+    return exp_sig_bits() == encode(Exponent::inf(), Significand::zero());
+  }
+  LIBC_INLINE constexpr bool is_finite() const {
+    return exp_bits() != encode(Exponent::inf());
+  }
+  LIBC_INLINE
+  constexpr bool is_subnormal() const {
+    return exp_bits() == encode(Exponent::subnormal());
+  }
+  LIBC_INLINE constexpr bool is_normal() const {
+    return is_finite() && !is_subnormal();
+  }
+  LIBC_INLINE constexpr RetT next_toward_inf() const {
+    if (is_finite())
+      return RetT(bits + StorageType(1));
+    return RetT(bits);
+  }
+
+  // Returns the mantissa with the implicit bit set iff the current
+  // value is a valid normal number.
+  LIBC_INLINE constexpr StorageType get_explicit_mantissa() const {
+    if (is_subnormal())
+      return sig_bits();
+    return (StorageType(1) << UP::SIG_LEN) | sig_bits();
+  }
+};
+
+// Specialization for the X86 Extended Precision type.
+template <typename RetT>
+struct FPRepSem<FPType::X86_Binary80, RetT>
+    : public FPStorage<FPType::X86_Binary80> {
+  using UP = FPStorage<FPType::X86_Binary80>;
+  using typename UP::StorageType;
+  using UP::FRACTION_LEN;
+  using UP::FRACTION_MASK;
+
+  // The x86 80 bit float represents the leading digit of the mantissa
+  // explicitly. This is the mask for that bit.
+  static constexpr StorageType EXPLICIT_BIT_MASK = StorageType(1)
+                                                   << FRACTION_LEN;
+  // The X80 significand is made of an explicit bit and the fractional part.
+  static_assert((EXPLICIT_BIT_MASK & FRACTION_MASK) == 0,
+                "the explicit bit and the fractional part should not overlap");
+  static_assert((EXPLICIT_BIT_MASK | FRACTION_MASK) == SIG_MASK,
+                "the explicit bit and the fractional part should cover the "
+                "whole significand");
+
+protected:
+  using typename UP::Exponent;
+  using typename UP::Significand;
+  using UP::encode;
+  using UP::UP;
+
+public:
+  // Builders
+  LIBC_INLINE static constexpr RetT zero(Sign sign = Sign::POS) {
+    return RetT(encode(sign, Exponent::subnormal(), Significand::zero()));
+  }
+  LIBC_INLINE static constexpr RetT one(Sign sign = Sign::POS) {
+    return RetT(encode(sign, Exponent::zero(), Significand::msb()));
+  }
+  LIBC_INLINE static constexpr RetT min_subnormal(Sign sign = Sign::POS) {
+    return RetT(encode(sign, Exponent::subnormal(), Significand::lsb()));
+  }
+  LIBC_INLINE static constexpr RetT max_subnormal(Sign sign = Sign::POS) {
+    return RetT(encode(sign, Exponent::subnormal(),
+                       Significand::bits_all_ones() ^ Significand::msb()));
+  }
+  LIBC_INLINE static constexpr RetT min_normal(Sign sign = Sign::POS) {
+    return RetT(encode(sign, Exponent::min(), Significand::msb()));
+  }
+  LIBC_INLINE static constexpr RetT max_normal(Sign sign = Sign::POS) {
+    return RetT(encode(sign, Exponent::max(), Significand::bits_all_ones()));
+  }
+  LIBC_INLINE static constexpr RetT inf(Sign sign = Sign::POS) {
+    return RetT(encode(sign, Exponent::inf(), Significand::msb()));
+  }
+  LIBC_INLINE static constexpr RetT signaling_nan(Sign sign = Sign::POS,
+                                                  StorageType v = 0) {
+    return RetT(encode(sign, Exponent::inf(),
+                       Significand::msb() |
+                           (v ? Significand(v) : (Significand::msb() >> 2))));
+  }
+  LIBC_INLINE static constexpr RetT quiet_nan(Sign sign = Sign::POS,
+                                              StorageType v = 0) {
+    return RetT(encode(sign, Exponent::inf(),
+                       Significand::msb() | (Significand::msb() >> 1) |
+                           Significand(v)));
+  }
+
+  // Observers
+  LIBC_INLINE constexpr bool is_zero() const { return exp_sig_bits() == 0; }
+  LIBC_INLINE constexpr bool is_nan() const {
+    // Most encoding forms from the table found in
+    // https://en.wikipedia.org/wiki/Extended_precision#x86_extended_precision_format
+    // are interpreted as NaN.
+    // More precisely :
+    // - Pseudo-Infinity
+    // - Pseudo Not a Number
+    // - Signalling Not a Number
+    // - Floating-point Indefinite
+    // - Quiet Not a Number
+    // - Unnormal
+    // This can be reduced to the following logic:
+    if (exp_bits() == encode(Exponent::inf()))
+      return !is_inf();
+    if (exp_bits() != encode(Exponent::subnormal()))
+      return (sig_bits() & encode(Significand::msb())) == 0;
+    return false;
+  }
+  LIBC_INLINE constexpr bool is_quiet_nan() const {
+    return exp_sig_bits() >=
+           encode(Exponent::inf(),
+                  Significand::msb() | (Significand::msb() >> 1));
+  }
+  LIBC_INLINE constexpr bool is_signaling_nan() const {
+    return is_nan() && !is_quiet_nan();
+  }
+  LIBC_INLINE constexpr bool is_inf() const {
+    return exp_sig_bits() == encode(Exponent::inf(), Significand::msb());
+  }
+  LIBC_INLINE constexpr bool is_finite() const {
+    return !is_inf() && !is_nan();
+  }
+  LIBC_INLINE
+  constexpr bool is_subnormal() const {
+    return exp_bits() == encode(Exponent::subnormal());
+  }
+  LIBC_INLINE constexpr bool is_normal() const {
+    const auto exp = exp_bits();
+    if (exp == encode(Exponent::subnormal()) || exp == encode(Exponent::inf()))
+      return false;
+    return get_implicit_bit();
+  }
+  LIBC_INLINE constexpr RetT next_toward_inf() const {
+    if (is_finite()) {
+      if (exp_sig_bits() == max_normal().uintval()) {
+        return inf(sign());
+      } else if (exp_sig_bits() == max_subnormal().uintval()) {
+        return min_normal(sign());
+      } else if (sig_bits() == SIG_MASK) {
+        return RetT(encode(sign(), ++biased_exponent(), Significand::zero()));
+      } else {
+        return RetT(bits + StorageType(1));
+      }
+    }
+    return RetT(bits);
+  }
+
+  LIBC_INLINE constexpr StorageType get_explicit_mantissa() const {
+    return sig_bits();
+  }
+
+  // This functions is specific to FPRepSem<FPType::X86_Binary80>.
+  // TODO: Remove if possible.
+  LIBC_INLINE constexpr bool get_implicit_bit() const {
+    return static_cast<bool>(bits & EXPLICIT_BIT_MASK);
+  }
+
+  // This functions is specific to FPRepSem<FPType::X86_Binary80>.
+  // TODO: Remove if possible.
+  LIBC_INLINE constexpr void set_implicit_bit(bool implicitVal) {
+    if (get_implicit_bit() != implicitVal)
+      bits ^= EXPLICIT_BIT_MASK;
+  }
+};
+
+// 'FPRepImpl' is the bottom of the class hierarchy that only deals with
+// 'FPType'. The operations dealing with specific float semantics are
+// implemented by 'FPRepSem' above and specialized when needed.
+//
+// The 'RetT' type is being propagated up to 'FPRepSem' so that the functions
+// creating new values (Builders) can return the appropriate type. That is, when
+// creating a value through 'FPBits' below the builder will return an 'FPBits'
+// value.
+// FPBits<float>::zero(); // returns an FPBits<>
+//
+// When we don't care about specific C++ floating point type we can use
+// 'FPRep' and specify the 'FPType' directly.
+// FPRep<FPType::IEEE754_Binary32:>::zero() // returns an FPRep<>
+template <FPType fp_type, typename RetT>
+struct FPRepImpl : public FPRepSem<fp_type, RetT> {
+  using UP = FPRepSem<fp_type, RetT>;
+  using StorageType = typename UP::StorageType;
+
+protected:
+  using UP::bits;
+  using UP::encode;
+  using UP::exp_bits;
+  using UP::exp_sig_bits;
+
+  using typename UP::BiasedExponent;
+  using typename UP::Exponent;
+  using typename UP::Significand;
+
+  using UP::FP_MASK;
+
+public:
+  // Constants.
+  using UP::EXP_BIAS;
+  using UP::EXP_MASK;
+  using UP::FRACTION_MASK;
+  using UP::SIG_LEN;
+  using UP::SIG_MASK;
+  using UP::SIGN_MASK;
+  LIBC_INLINE_VAR static constexpr int MAX_BIASED_EXPONENT =
+      (1 << UP::EXP_LEN) - 1;
+
+  // CTors
+  LIBC_INLINE constexpr FPRepImpl() = default;
+  LIBC_INLINE constexpr explicit FPRepImpl(StorageType x) : UP(x) {}
+
+  // Comparison
+  LIBC_INLINE constexpr friend bool operator==(FPRepImpl a, FPRepImpl b) {
+    return a.uintval() == b.uintval();
+  }
+  LIBC_INLINE constexpr friend bool operator!=(FPRepImpl a, FPRepImpl b) {
+    return a.uintval() != b.uintval();
+  }
+
+  // Representation
+  LIBC_INLINE constexpr StorageType uintval() const { return bits & FP_MASK; }
+  LIBC_INLINE constexpr void set_uintval(StorageType value) {
+    bits = (value & FP_MASK);
+  }
+
+  // Builders
+  using UP::inf;
+  using UP::max_normal;
+  using UP::max_subnormal;
+  using UP::min_normal;
+  using UP::min_subnormal;
+  using UP::one;
+  using UP::quiet_nan;
+  using UP::signaling_nan;
+  using UP::zero;
+
+  // Modifiers
+  LIBC_INLINE constexpr RetT abs() const {
+    return RetT(static_cast<StorageType>(bits & UP::EXP_SIG_MASK));
+  }
+
+  // Observers
+  using UP::get_explicit_mantissa;
+  using UP::is_finite;
+  using UP::is_inf;
+  using UP::is_nan;
+  using UP::is_normal;
+  using UP::is_quiet_nan;
+  using UP::is_signaling_nan;
+  using UP::is_subnormal;
+  using UP::is_zero;
+  using UP::next_toward_inf;
+  using UP::sign;
+  LIBC_INLINE constexpr bool is_inf_or_nan() const { return !is_finite(); }
+  LIBC_INLINE constexpr bool is_neg() const { return sign().is_neg(); }
+  LIBC_INLINE constexpr bool is_pos() const { return sign().is_pos(); }
+
+  LIBC_INLINE constexpr uint16_t get_biased_exponent() const {
+    return static_cast<uint16_t>(static_cast<uint32_t>(UP::biased_exponent()));
+  }
+
+  LIBC_INLINE constexpr void set_biased_exponent(StorageType biased) {
+    UP::set_biased_exponent(BiasedExponent(static_cast<uint32_t>(biased)));
+  }
+
+  LIBC_INLINE constexpr int get_exponent() const {
+    return static_cast<int32_t>(Exponent(UP::biased_exponent()));
+  }
+
+  // If the number is subnormal, the exponent is treated as if it were the
+  // minimum exponent for a normal number. This is to keep continuity between
+  // the normal and subnormal ranges, but it causes problems for functions where
+  // values are calculated from the exponent, since just subtracting the bias
+  // will give a slightly incorrect result. Additionally, zero has an exponent
+  // of zero, and that should actually be treated as zero.
+  LIBC_INLINE constexpr int get_explicit_exponent() const {
+    Exponent exponent(UP::biased_exponent());
+    if (is_zero())
+      exponent = Exponent::zero();
+    if (exponent == Exponent::subnormal())
+      exponent = Exponent::min();
+    return static_cast<int32_t>(exponent);
+  }
+
+  LIBC_INLINE constexpr StorageType get_mantissa() const {
+    return bits & FRACTION_MASK;
+  }
+
+  LIBC_INLINE constexpr void set_mantissa(StorageType mantVal) {
+    bits = UP::merge(bits, mantVal, FRACTION_MASK);
+  }
+
+  LIBC_INLINE constexpr void set_significand(StorageType sigVal) {
+    bits = UP::merge(bits, sigVal, SIG_MASK);
+  }
+  // Unsafe function to create a floating point representation.
+  // It simply packs the sign, biased exponent and mantissa values without
+  // checking bound nor normalization.
+  //
+  // WARNING: For X86 Extended Precision, implicit bit needs to be set correctly
+  // in the 'mantissa' by the caller.  This function will not check for its
+  // validity.
+  //
+  // FIXME: Use an uint32_t for 'biased_exp'.
+  LIBC_INLINE static constexpr RetT
+  create_value(Sign sign, StorageType biased_exp, StorageType mantissa) {
+    return RetT(encode(sign, BiasedExponent(static_cast<uint32_t>(biased_exp)),
+                       Significand(mantissa)));
+  }
+
+  // The function converts integer number and unbiased exponent to proper
+  // float T type:
+  //   Result = number * 2^(ep+1 - exponent_bias)
+  // Be careful!
+  //   1) "ep" is the raw exponent value.
+  //   2) The function adds +1 to ep for seamless normalized to denormalized
+  //      transition.
+  //   3) The function does not check exponent high limit.
+  //   4) "number" zero value is not processed correctly.
+  //   5) Number is unsigned, so the result can be only positive.
+  LIBC_INLINE static constexpr RetT make_value(StorageType number, int ep) {
+    FPRepImpl result(0);
+    int lz =
+        UP::FRACTION_LEN + 1 - (UP::STORAGE_LEN - cpp::countl_zero(number));
+
+    number <<= lz;
+    ep -= lz;
+
+    if (LIBC_LIKELY(ep >= 0)) {
+      // Implicit number bit will be removed by mask
+      result.set_significand(number);
+      result.set_biased_exponent(static_cast<StorageType>(ep + 1));
+    } else {
+      result.set_significand(number >> static_cast<unsigned>(-ep));
+    }
+    return RetT(result.uintval());
+  }
+};
+
+// A generic class to manipulate floating point formats.
+// It derives its functionality to FPRepImpl above.
+template <FPType fp_type>
+struct FPRep : public FPRepImpl<fp_type, FPRep<fp_type>> {
+  using UP = FPRepImpl<fp_type, FPRep<fp_type>>;
+  using StorageType = typename UP::StorageType;
+  using UP::UP;
+
+  LIBC_INLINE constexpr explicit operator StorageType() const {
+    return UP::uintval();
+  }
+};
+
+} // namespace internal
+
+// Returns the FPType corresponding to C++ type T on the host.
+template <typename T> LIBC_INLINE static constexpr FPType get_fp_type() {
+  using UnqualT = cpp::remove_cv_t<T>;
+  if constexpr (cpp::is_same_v<UnqualT, float> && __FLT_MANT_DIG__ == 24)
+    return FPType::IEEE754_Binary32;
+  else if constexpr (cpp::is_same_v<UnqualT, double> && __DBL_MANT_DIG__ == 53)
+    return FPType::IEEE754_Binary64;
+  else if constexpr (cpp::is_same_v<UnqualT, long double>) {
+    if constexpr (__LDBL_MANT_DIG__ == 53)
+      return FPType::IEEE754_Binary64;
+    else if constexpr (__LDBL_MANT_DIG__ == 64)
+      return FPType::X86_Binary80;
+    else if constexpr (__LDBL_MANT_DIG__ == 113)
+      return FPType::IEEE754_Binary128;
+  }
+#if defined(LIBC_TYPES_HAS_FLOAT16)
+  else if constexpr (cpp::is_same_v<UnqualT, float16>)
+    return FPType::IEEE754_Binary16;
+#endif
+#if defined(LIBC_TYPES_HAS_FLOAT128)
+  else if constexpr (cpp::is_same_v<UnqualT, float128>)
+    return FPType::IEEE754_Binary128;
+#endif
+  else if constexpr (cpp::is_same_v<UnqualT, bfloat16>)
+    return FPType::BFloat16;
+  else
+    static_assert(cpp::always_false<UnqualT>, "Unsupported type");
+}
+
+// -----------------------------------------------------------------------------
+//                               **** WARNING ****
+// This interface is shared with libc++, if you change this interface you need
+// to update it in both libc and libc++. You should also be careful when adding
+// dependencies to this file, since it needs to build for all libc++ targets.
+// -----------------------------------------------------------------------------
+// A generic class to manipulate C++ floating point formats.
+// It derives its functionality to FPRepImpl above.
+template <typename T>
+struct FPBits final : public internal::FPRepImpl<get_fp_type<T>(), FPBits<T>> {
+  static_assert(cpp::is_floating_point_v<T>,
+                "FPBits instantiated with invalid type.");
+  using UP = internal::FPRepImpl<get_fp_type<T>(), FPBits<T>>;
+  using StorageType = typename UP::StorageType;
+
+  // Constructors.
+  LIBC_INLINE constexpr FPBits() = default;
+
+  template <typename XType> LIBC_INLINE constexpr explicit FPBits(XType x) {
+    using Unqual = typename cpp::remove_cv_t<XType>;
+    if constexpr (cpp::is_same_v<Unqual, T>) {
+      UP::bits = cpp::bit_cast<StorageType>(x);
+    } else if constexpr (cpp::is_same_v<Unqual, StorageType>) {
+      UP::bits = x;
+    } else {
+      // We don't want accidental type promotions/conversions, so we require
+      // exact type match.
+      static_assert(cpp::always_false<XType>);
+    }
+  }
+
+  // Floating-point conversions.
+  LIBC_INLINE constexpr T get_val() const { return cpp::bit_cast<T>(UP::bits); }
+};
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_FPBITS_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/Hypot.h b/contrib/llvm-project/libc/src/__support/FPUtil/Hypot.h
new file mode 100644
index 000000000000..94da259cd42f
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/Hypot.h
@@ -0,0 +1,268 @@
+//===-- Implementation of hypotf function ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_HYPOT_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_HYPOT_H
+
+#include "BasicOperations.h"
+#include "FEnvImpl.h"
+#include "FPBits.h"
+#include "rounding_mode.h"
+#include "src/__support/CPP/bit.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/uint128.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+namespace internal {
+
+template <typename T>
+LIBC_INLINE T find_leading_one(T mant, int &shift_length) {
+  shift_length = 0;
+  if (mant > 0) {
+    shift_length = (sizeof(mant) * 8) - 1 - cpp::countl_zero(mant);
+  }
+  return static_cast<T>((T(1) << shift_length));
+}
+
+} // namespace internal
+
+template <typename T> struct DoubleLength;
+
+template <> struct DoubleLength<uint16_t> {
+  using Type = uint32_t;
+};
+
+template <> struct DoubleLength<uint32_t> {
+  using Type = uint64_t;
+};
+
+template <> struct DoubleLength<uint64_t> {
+  using Type = UInt128;
+};
+
+// Correctly rounded IEEE 754 HYPOT(x, y) with round to nearest, ties to even.
+//
+// Algorithm:
+//   -  Let a = max(|x|, |y|), b = min(|x|, |y|), then we have that:
+//          a <= sqrt(a^2 + b^2) <= min(a + b, a*sqrt(2))
+//   1. So if b < eps(a)/2, then HYPOT(x, y) = a.
+//
+//   -  Moreover, the exponent part of HYPOT(x, y) is either the same or 1 more
+//      than the exponent part of a.
+//
+//   2. For the remaining cases, we will use the digit-by-digit (shift-and-add)
+//      algorithm to compute SQRT(Z):
+//
+//   -  For Y = y0.y1...yn... = SQRT(Z),
+//      let Y(n) = y0.y1...yn be the first n fractional digits of Y.
+//
+//   -  The nth scaled residual R(n) is defined to be:
+//          R(n) = 2^n * (Z - Y(n)^2)
+//
+//   -  Since Y(n) = Y(n - 1) + yn * 2^(-n), the scaled residual
+//      satisfies the following recurrence formula:
+//          R(n) = 2*R(n - 1) - yn*(2*Y(n - 1) + 2^(-n)),
+//      with the initial conditions:
+//          Y(0) = y0, and R(0) = Z - y0.
+//
+//   -  So the nth fractional digit of Y = SQRT(Z) can be decided by:
+//          yn = 1  if 2*R(n - 1) >= 2*Y(n - 1) + 2^(-n),
+//               0  otherwise.
+//
+//   3. Precision analysis:
+//
+//   -  Notice that in the decision function:
+//          2*R(n - 1) >= 2*Y(n - 1) + 2^(-n),
+//      the right hand side only uses up to the 2^(-n)-bit, and both sides are
+//      non-negative, so R(n - 1) can be truncated at the 2^(-(n + 1))-bit, so
+//      that 2*R(n - 1) is corrected up to the 2^(-n)-bit.
+//
+//   -  Thus, in order to round SQRT(a^2 + b^2) correctly up to n-fractional
+//      bits, we need to perform the summation (a^2 + b^2) correctly up to (2n +
+//      2)-fractional bits, and the remaining bits are sticky bits (i.e. we only
+//      care if they are 0 or > 0), and the comparisons, additions/subtractions
+//      can be done in n-fractional bits precision.
+//
+//   -  For single precision (float), we can use uint64_t to store the sum a^2 +
+//      b^2 exact up to (2n + 2)-fractional bits.
+//
+//   -  Then we can feed this sum into the digit-by-digit algorithm for SQRT(Z)
+//      described above.
+//
+//
+// Special cases:
+//   - HYPOT(x, y) is +Inf if x or y is +Inf or -Inf; else
+//   - HYPOT(x, y) is NaN if x or y is NaN.
+//
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T hypot(T x, T y) {
+  using FPBits_t = FPBits<T>;
+  using StorageType = typename FPBits<T>::StorageType;
+  using DStorageType = typename DoubleLength<StorageType>::Type;
+
+  FPBits_t x_abs = FPBits_t(x).abs();
+  FPBits_t y_abs = FPBits_t(y).abs();
+
+  bool x_abs_larger = x_abs.uintval() >= y_abs.uintval();
+
+  FPBits_t a_bits = x_abs_larger ? x_abs : y_abs;
+  FPBits_t b_bits = x_abs_larger ? y_abs : x_abs;
+
+  if (LIBC_UNLIKELY(a_bits.is_inf_or_nan())) {
+    if (x_abs.is_signaling_nan() || y_abs.is_signaling_nan()) {
+      fputil::raise_except_if_required(FE_INVALID);
+      return FPBits_t::quiet_nan().get_val();
+    }
+    if (x_abs.is_inf() || y_abs.is_inf())
+      return FPBits_t::inf().get_val();
+    if (x_abs.is_nan())
+      return x;
+    // y is nan
+    return y;
+  }
+
+  uint16_t a_exp = a_bits.get_biased_exponent();
+  uint16_t b_exp = b_bits.get_biased_exponent();
+
+  if ((a_exp - b_exp >= FPBits_t::FRACTION_LEN + 2) || (x == 0) || (y == 0))
+    return x_abs.get_val() + y_abs.get_val();
+
+  uint64_t out_exp = a_exp;
+  StorageType a_mant = a_bits.get_mantissa();
+  StorageType b_mant = b_bits.get_mantissa();
+  DStorageType a_mant_sq, b_mant_sq;
+  bool sticky_bits;
+
+  // Add an extra bit to simplify the final rounding bit computation.
+  constexpr StorageType ONE = StorageType(1) << (FPBits_t::FRACTION_LEN + 1);
+
+  a_mant <<= 1;
+  b_mant <<= 1;
+
+  StorageType leading_one;
+  int y_mant_width;
+  if (a_exp != 0) {
+    leading_one = ONE;
+    a_mant |= ONE;
+    y_mant_width = FPBits_t::FRACTION_LEN + 1;
+  } else {
+    leading_one = internal::find_leading_one(a_mant, y_mant_width);
+    a_exp = 1;
+  }
+
+  if (b_exp != 0)
+    b_mant |= ONE;
+  else
+    b_exp = 1;
+
+  a_mant_sq = static_cast<DStorageType>(a_mant) * a_mant;
+  b_mant_sq = static_cast<DStorageType>(b_mant) * b_mant;
+
+  // At this point, a_exp >= b_exp > a_exp - 25, so in order to line up aSqMant
+  // and bSqMant, we need to shift bSqMant to the right by (a_exp - b_exp) bits.
+  // But before that, remember to store the losing bits to sticky.
+  // The shift length is for a^2 and b^2, so it's double of the exponent
+  // difference between a and b.
+  uint16_t shift_length = static_cast<uint16_t>(2 * (a_exp - b_exp));
+  sticky_bits =
+      ((b_mant_sq & ((DStorageType(1) << shift_length) - DStorageType(1))) !=
+       DStorageType(0));
+  b_mant_sq >>= shift_length;
+
+  DStorageType sum = a_mant_sq + b_mant_sq;
+  if (sum >= (DStorageType(1) << (2 * y_mant_width + 2))) {
+    // a^2 + b^2 >= 4* leading_one^2, so we will need an extra bit to the left.
+    if (leading_one == ONE) {
+      // For normal result, we discard the last 2 bits of the sum and increase
+      // the exponent.
+      sticky_bits = sticky_bits || ((sum & 0x3U) != 0);
+      sum >>= 2;
+      ++out_exp;
+      if (out_exp >= FPBits_t::MAX_BIASED_EXPONENT) {
+        if (int round_mode = quick_get_round();
+            round_mode == FE_TONEAREST || round_mode == FE_UPWARD)
+          return FPBits_t::inf().get_val();
+        return FPBits_t::max_normal().get_val();
+      }
+    } else {
+      // For denormal result, we simply move the leading bit of the result to
+      // the left by 1.
+      leading_one <<= 1;
+      ++y_mant_width;
+    }
+  }
+
+  StorageType y_new = leading_one;
+  StorageType r = static_cast<StorageType>(sum >> y_mant_width) - leading_one;
+  StorageType tail_bits = static_cast<StorageType>(sum) & (leading_one - 1);
+
+  for (StorageType current_bit = leading_one >> 1; current_bit;
+       current_bit >>= 1) {
+    r = static_cast<StorageType>((r << 1)) +
+        ((tail_bits & current_bit) ? 1 : 0);
+    StorageType tmp = static_cast<StorageType>((y_new << 1)) +
+                      current_bit; // 2*y_new(n - 1) + 2^(-n)
+    if (r >= tmp) {
+      r -= tmp;
+      y_new += current_bit;
+    }
+  }
+
+  bool round_bit = y_new & StorageType(1);
+  bool lsb = y_new & StorageType(2);
+
+  if (y_new >= ONE) {
+    y_new -= ONE;
+
+    if (out_exp == 0) {
+      out_exp = 1;
+    }
+  }
+
+  y_new >>= 1;
+
+  // Round to the nearest, tie to even.
+  int round_mode = quick_get_round();
+  switch (round_mode) {
+  case FE_TONEAREST:
+    // Round to nearest, ties to even
+    if (round_bit && (lsb || sticky_bits || (r != 0)))
+      ++y_new;
+    break;
+  case FE_UPWARD:
+    if (round_bit || sticky_bits || (r != 0))
+      ++y_new;
+    break;
+  }
+
+  if (y_new >= (ONE >> 1)) {
+    y_new -= ONE >> 1;
+    ++out_exp;
+    if (out_exp >= FPBits_t::MAX_BIASED_EXPONENT) {
+      if (round_mode == FE_TONEAREST || round_mode == FE_UPWARD)
+        return FPBits_t::inf().get_val();
+      return FPBits_t::max_normal().get_val();
+    }
+  }
+
+  y_new |= static_cast<StorageType>(out_exp) << FPBits_t::FRACTION_LEN;
+
+  if (!(round_bit || sticky_bits || (r != 0)))
+    fputil::clear_except_if_required(FE_INEXACT);
+
+  return cpp::bit_cast<T>(y_new);
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_HYPOT_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/ManipulationFunctions.h b/contrib/llvm-project/libc/src/__support/FPUtil/ManipulationFunctions.h
new file mode 100644
index 000000000000..ea9ee5a57c36
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/ManipulationFunctions.h
@@ -0,0 +1,279 @@
+//===-- Floating-point manipulation functions -------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_MANIPULATIONFUNCTIONS_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_MANIPULATIONFUNCTIONS_H
+
+#include "FPBits.h"
+#include "NearestIntegerOperations.h"
+#include "NormalFloat.h"
+#include "cast.h"
+#include "dyadic_float.h"
+#include "rounding_mode.h"
+
+#include "hdr/math_macros.h"
+#include "src/__support/CPP/bit.h"
+#include "src/__support/CPP/limits.h" // INT_MAX, INT_MIN
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/FPUtil/FEnvImpl.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE constexpr T frexp(T x, int &exp) {
+  FPBits<T> bits(x);
+  if (bits.is_inf_or_nan()) {
+#ifdef LIBC_FREXP_INF_NAN_EXPONENT
+    // The value written back to the second parameter when calling
+    // frexp/frexpf/frexpl` with `+/-Inf`/`NaN` is unspecified in the standard.
+    // Set the exp value for Inf/NaN inputs explicitly to
+    // LIBC_FREXP_INF_NAN_EXPONENT if it is defined.
+    exp = LIBC_FREXP_INF_NAN_EXPONENT;
+#endif // LIBC_FREXP_INF_NAN_EXPONENT
+    return x;
+  }
+  if (bits.is_zero()) {
+    exp = 0;
+    return x;
+  }
+
+  NormalFloat<T> normal(bits);
+  exp = normal.exponent + 1;
+  normal.exponent = -1;
+  return normal;
+}
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T modf(T x, T &iptr) {
+  FPBits<T> bits(x);
+  if (bits.is_zero() || bits.is_nan()) {
+    iptr = x;
+    return x;
+  } else if (bits.is_inf()) {
+    iptr = x;
+    return FPBits<T>::zero(bits.sign()).get_val();
+  } else {
+    iptr = trunc(x);
+    if (x == iptr) {
+      // If x is already an integer value, then return zero with the right
+      // sign.
+      return FPBits<T>::zero(bits.sign()).get_val();
+    } else {
+      return x - iptr;
+    }
+  }
+}
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T copysign(T x, T y) {
+  FPBits<T> xbits(x);
+  xbits.set_sign(FPBits<T>(y).sign());
+  return xbits.get_val();
+}
+
+template <typename T> struct IntLogbConstants;
+
+template <> struct IntLogbConstants<int> {
+  LIBC_INLINE_VAR static constexpr int FP_LOGB0 = FP_ILOGB0;
+  LIBC_INLINE_VAR static constexpr int FP_LOGBNAN = FP_ILOGBNAN;
+  LIBC_INLINE_VAR static constexpr int T_MAX = INT_MAX;
+  LIBC_INLINE_VAR static constexpr int T_MIN = INT_MIN;
+};
+
+template <> struct IntLogbConstants<long> {
+  LIBC_INLINE_VAR static constexpr long FP_LOGB0 = FP_ILOGB0;
+  LIBC_INLINE_VAR static constexpr long FP_LOGBNAN = FP_ILOGBNAN;
+  LIBC_INLINE_VAR static constexpr long T_MAX = LONG_MAX;
+  LIBC_INLINE_VAR static constexpr long T_MIN = LONG_MIN;
+};
+
+template <typename T, typename U>
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_floating_point_v<U>, T>
+intlogb(U x) {
+  FPBits<U> bits(x);
+  if (LIBC_UNLIKELY(bits.is_zero() || bits.is_inf_or_nan())) {
+    set_errno_if_required(EDOM);
+    raise_except_if_required(FE_INVALID);
+
+    if (bits.is_zero())
+      return IntLogbConstants<T>::FP_LOGB0;
+    if (bits.is_nan())
+      return IntLogbConstants<T>::FP_LOGBNAN;
+    // bits is inf.
+    return IntLogbConstants<T>::T_MAX;
+  }
+
+  DyadicFloat<FPBits<U>::STORAGE_LEN> normal(bits.get_val());
+  int exponent = normal.get_unbiased_exponent();
+  // The C standard does not specify the return value when an exponent is
+  // out of int range. However, XSI conformance required that INT_MAX or
+  // INT_MIN are returned.
+  // NOTE: It is highly unlikely that exponent will be out of int range as
+  // the exponent is only 15 bits wide even for the 128-bit floating point
+  // format.
+  if (LIBC_UNLIKELY(exponent > IntLogbConstants<T>::T_MAX ||
+                    exponent < IntLogbConstants<T>::T_MIN)) {
+    set_errno_if_required(ERANGE);
+    raise_except_if_required(FE_INVALID);
+    return exponent > 0 ? IntLogbConstants<T>::T_MAX
+                        : IntLogbConstants<T>::T_MIN;
+  }
+
+  return static_cast<T>(exponent);
+}
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE constexpr T logb(T x) {
+  FPBits<T> bits(x);
+  if (LIBC_UNLIKELY(bits.is_zero() || bits.is_inf_or_nan())) {
+    if (bits.is_nan())
+      return x;
+
+    raise_except_if_required(FE_DIVBYZERO);
+
+    if (bits.is_zero()) {
+      set_errno_if_required(ERANGE);
+      return FPBits<T>::inf(Sign::NEG).get_val();
+    }
+    // bits is inf.
+    return FPBits<T>::inf().get_val();
+  }
+
+  DyadicFloat<FPBits<T>::STORAGE_LEN> normal(bits.get_val());
+  return static_cast<T>(normal.get_unbiased_exponent());
+}
+
+template <typename T, typename U>
+LIBC_INLINE constexpr cpp::enable_if_t<
+    cpp::is_floating_point_v<T> && cpp::is_integral_v<U>, T>
+ldexp(T x, U exp) {
+  FPBits<T> bits(x);
+  if (LIBC_UNLIKELY((exp == 0) || bits.is_zero() || bits.is_inf_or_nan()))
+    return x;
+
+  // NormalFloat uses int32_t to store the true exponent value. We should ensure
+  // that adding |exp| to it does not lead to integer rollover. But, if |exp|
+  // value is larger the exponent range for type T, then we can return infinity
+  // early. Because the result of the ldexp operation can be a subnormal number,
+  // we need to accommodate the (mantissaWidth + 1) worth of shift in
+  // calculating the limit.
+  constexpr int EXP_LIMIT =
+      FPBits<T>::MAX_BIASED_EXPONENT + FPBits<T>::FRACTION_LEN + 1;
+  // Make sure that we can safely cast exp to int when not returning early.
+  static_assert(EXP_LIMIT <= INT_MAX && -EXP_LIMIT >= INT_MIN);
+  if (LIBC_UNLIKELY(exp > EXP_LIMIT)) {
+    int rounding_mode = quick_get_round();
+    Sign sign = bits.sign();
+
+    if ((sign == Sign::POS && rounding_mode == FE_DOWNWARD) ||
+        (sign == Sign::NEG && rounding_mode == FE_UPWARD) ||
+        (rounding_mode == FE_TOWARDZERO))
+      return FPBits<T>::max_normal(sign).get_val();
+
+    set_errno_if_required(ERANGE);
+    raise_except_if_required(FE_OVERFLOW);
+    return FPBits<T>::inf(sign).get_val();
+  }
+
+  // Similarly on the negative side we return zero early if |exp| is too small.
+  if (LIBC_UNLIKELY(exp < -EXP_LIMIT)) {
+    int rounding_mode = quick_get_round();
+    Sign sign = bits.sign();
+
+    if ((sign == Sign::POS && rounding_mode == FE_UPWARD) ||
+        (sign == Sign::NEG && rounding_mode == FE_DOWNWARD))
+      return FPBits<T>::min_subnormal(sign).get_val();
+
+    set_errno_if_required(ERANGE);
+    raise_except_if_required(FE_UNDERFLOW);
+    return FPBits<T>::zero(sign).get_val();
+  }
+
+  // For all other values, NormalFloat to T conversion handles it the right way.
+  DyadicFloat<FPBits<T>::STORAGE_LEN> normal(bits.get_val());
+  normal.exponent += static_cast<int>(exp);
+  // TODO: Add tests for exceptions.
+  return normal.template as<T, /*ShouldRaiseExceptions=*/true>();
+}
+
+template <typename T, typename U,
+          cpp::enable_if_t<cpp::is_floating_point_v<T> &&
+                               cpp::is_floating_point_v<U> &&
+                               (sizeof(T) <= sizeof(U)),
+                           int> = 0>
+LIBC_INLINE T nextafter(T from, U to) {
+  FPBits<T> from_bits(from);
+  if (from_bits.is_nan())
+    return from;
+
+  FPBits<U> to_bits(to);
+  if (to_bits.is_nan())
+    return cast<T>(to);
+
+  // NOTE: This would work only if `U` has a greater or equal precision than
+  // `T`. Otherwise `from` could loose its precision and the following statement
+  // could incorrectly evaluate to `true`.
+  if (cast<U>(from) == to)
+    return cast<T>(to);
+
+  using StorageType = typename FPBits<T>::StorageType;
+  if (from != T(0)) {
+    if ((cast<U>(from) < to) == (from > T(0))) {
+      from_bits = FPBits<T>(StorageType(from_bits.uintval() + 1));
+    } else {
+      from_bits = FPBits<T>(StorageType(from_bits.uintval() - 1));
+    }
+  } else {
+    from_bits = FPBits<T>::min_subnormal(to_bits.sign());
+  }
+
+  if (from_bits.is_subnormal())
+    raise_except_if_required(FE_UNDERFLOW | FE_INEXACT);
+  else if (from_bits.is_inf())
+    raise_except_if_required(FE_OVERFLOW | FE_INEXACT);
+
+  return from_bits.get_val();
+}
+
+template <bool IsDown, typename T,
+          cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE constexpr T nextupdown(T x) {
+  constexpr Sign sign = IsDown ? Sign::NEG : Sign::POS;
+
+  FPBits<T> xbits(x);
+  if (xbits.is_nan() || xbits == FPBits<T>::max_normal(sign) ||
+      xbits == FPBits<T>::inf(sign))
+    return x;
+
+  using StorageType = typename FPBits<T>::StorageType;
+  if (x != T(0)) {
+    if (xbits.sign() == sign) {
+      xbits = FPBits<T>(StorageType(xbits.uintval() + 1));
+    } else {
+      xbits = FPBits<T>(StorageType(xbits.uintval() - 1));
+    }
+  } else {
+    xbits = FPBits<T>::min_subnormal(sign);
+  }
+
+  return xbits.get_val();
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#ifdef LIBC_TYPES_LONG_DOUBLE_IS_X86_FLOAT80
+#include "x86_64/NextAfterLongDouble.h"
+#include "x86_64/NextUpDownLongDouble.h"
+#endif // LIBC_TYPES_LONG_DOUBLE_IS_X86_FLOAT80
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_MANIPULATIONFUNCTIONS_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/NearestIntegerOperations.h b/contrib/llvm-project/libc/src/__support/FPUtil/NearestIntegerOperations.h
new file mode 100644
index 000000000000..93166614cc12
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/NearestIntegerOperations.h
@@ -0,0 +1,411 @@
+//===-- Nearest integer floating-point operations ---------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_NEARESTINTEGEROPERATIONS_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_NEARESTINTEGEROPERATIONS_H
+
+#include "FEnvImpl.h"
+#include "FPBits.h"
+#include "rounding_mode.h"
+
+#include "hdr/math_macros.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T trunc(T x) {
+  using StorageType = typename FPBits<T>::StorageType;
+  FPBits<T> bits(x);
+
+  // If x is infinity or NaN, return it.
+  // If it is zero also we should return it as is, but the logic
+  // later in this function takes care of it. But not doing a zero
+  // check, we improve the run time of non-zero values.
+  if (bits.is_inf_or_nan())
+    return x;
+
+  int exponent = bits.get_exponent();
+
+  // If the exponent is greater than the most negative mantissa
+  // exponent, then x is already an integer.
+  if (exponent >= static_cast<int>(FPBits<T>::FRACTION_LEN))
+    return x;
+
+  // If the exponent is such that abs(x) is less than 1, then return 0.
+  if (exponent <= -1)
+    return FPBits<T>::zero(bits.sign()).get_val();
+
+  int trim_size = FPBits<T>::FRACTION_LEN - exponent;
+  StorageType trunc_mantissa =
+      static_cast<StorageType>((bits.get_mantissa() >> trim_size) << trim_size);
+  bits.set_mantissa(trunc_mantissa);
+  return bits.get_val();
+}
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T ceil(T x) {
+  using StorageType = typename FPBits<T>::StorageType;
+  FPBits<T> bits(x);
+
+  // If x is infinity NaN or zero, return it.
+  if (bits.is_inf_or_nan() || bits.is_zero())
+    return x;
+
+  bool is_neg = bits.is_neg();
+  int exponent = bits.get_exponent();
+
+  // If the exponent is greater than the most negative mantissa
+  // exponent, then x is already an integer.
+  if (exponent >= static_cast<int>(FPBits<T>::FRACTION_LEN))
+    return x;
+
+  if (exponent <= -1) {
+    if (is_neg)
+      return T(-0.0);
+    else
+      return T(1.0);
+  }
+
+  uint32_t trim_size = FPBits<T>::FRACTION_LEN - exponent;
+  StorageType x_u = bits.uintval();
+  StorageType trunc_u =
+      static_cast<StorageType>((x_u >> trim_size) << trim_size);
+
+  // If x is already an integer, return it.
+  if (trunc_u == x_u)
+    return x;
+
+  bits.set_uintval(trunc_u);
+  T trunc_value = bits.get_val();
+
+  // If x is negative, the ceil operation is equivalent to the trunc operation.
+  if (is_neg)
+    return trunc_value;
+
+  return trunc_value + T(1.0);
+}
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T floor(T x) {
+  FPBits<T> bits(x);
+  if (bits.is_neg()) {
+    return -ceil(-x);
+  } else {
+    return trunc(x);
+  }
+}
+
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T round(T x) {
+  using StorageType = typename FPBits<T>::StorageType;
+  FPBits<T> bits(x);
+
+  // If x is infinity NaN or zero, return it.
+  if (bits.is_inf_or_nan() || bits.is_zero())
+    return x;
+
+  int exponent = bits.get_exponent();
+
+  // If the exponent is greater than the most negative mantissa
+  // exponent, then x is already an integer.
+  if (exponent >= static_cast<int>(FPBits<T>::FRACTION_LEN))
+    return x;
+
+  if (exponent == -1) {
+    // Absolute value of x is greater than equal to 0.5 but less than 1.
+    return FPBits<T>::one(bits.sign()).get_val();
+  }
+
+  if (exponent <= -2) {
+    // Absolute value of x is less than 0.5.
+    return FPBits<T>::zero(bits.sign()).get_val();
+  }
+
+  uint32_t trim_size = FPBits<T>::FRACTION_LEN - exponent;
+  bool half_bit_set =
+      bool(bits.get_mantissa() & (StorageType(1) << (trim_size - 1)));
+  StorageType x_u = bits.uintval();
+  StorageType trunc_u =
+      static_cast<StorageType>((x_u >> trim_size) << trim_size);
+
+  // If x is already an integer, return it.
+  if (trunc_u == x_u)
+    return x;
+
+  bits.set_uintval(trunc_u);
+  T trunc_value = bits.get_val();
+
+  if (!half_bit_set) {
+    // Franctional part is less than 0.5 so round value is the
+    // same as the trunc value.
+    return trunc_value;
+  } else {
+    return bits.is_neg() ? trunc_value - T(1.0) : trunc_value + T(1.0);
+  }
+}
+
+template <typename T>
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_floating_point_v<T>, T>
+round_using_specific_rounding_mode(T x, int rnd) {
+  using StorageType = typename FPBits<T>::StorageType;
+  FPBits<T> bits(x);
+
+  // If x is infinity NaN or zero, return it.
+  if (bits.is_inf_or_nan() || bits.is_zero())
+    return x;
+
+  bool is_neg = bits.is_neg();
+  int exponent = bits.get_exponent();
+
+  // If the exponent is greater than the most negative mantissa
+  // exponent, then x is already an integer.
+  if (exponent >= static_cast<int>(FPBits<T>::FRACTION_LEN))
+    return x;
+
+  if (exponent <= -1) {
+    switch (rnd) {
+    case FP_INT_DOWNWARD:
+      return is_neg ? T(-1.0) : T(0.0);
+    case FP_INT_UPWARD:
+      return is_neg ? T(-0.0) : T(1.0);
+    case FP_INT_TOWARDZERO:
+      return is_neg ? T(-0.0) : T(0.0);
+    case FP_INT_TONEARESTFROMZERO:
+      if (exponent < -1)
+        return is_neg ? T(-0.0) : T(0.0); // abs(x) < 0.5
+      return is_neg ? T(-1.0) : T(1.0);   // abs(x) >= 0.5
+    case FP_INT_TONEAREST:
+    default:
+      if (exponent <= -2 || bits.get_mantissa() == 0)
+        return is_neg ? T(-0.0) : T(0.0); // abs(x) <= 0.5
+      else
+        return is_neg ? T(-1.0) : T(1.0); // abs(x) > 0.5
+    }
+  }
+
+  uint32_t trim_size = FPBits<T>::FRACTION_LEN - exponent;
+  StorageType x_u = bits.uintval();
+  StorageType trunc_u =
+      static_cast<StorageType>((x_u >> trim_size) << trim_size);
+
+  // If x is already an integer, return it.
+  if (trunc_u == x_u)
+    return x;
+
+  FPBits<T> new_bits(trunc_u);
+  T trunc_value = new_bits.get_val();
+
+  StorageType trim_value =
+      bits.get_mantissa() &
+      static_cast<StorageType>(((StorageType(1) << trim_size) - 1));
+  StorageType half_value =
+      static_cast<StorageType>((StorageType(1) << (trim_size - 1)));
+  // If exponent is 0, trimSize will be equal to the mantissa width, and
+  // truncIsOdd` will not be correct. So, we handle it as a special case
+  // below.
+  StorageType trunc_is_odd =
+      new_bits.get_mantissa() & (StorageType(1) << trim_size);
+
+  switch (rnd) {
+  case FP_INT_DOWNWARD:
+    return is_neg ? trunc_value - T(1.0) : trunc_value;
+  case FP_INT_UPWARD:
+    return is_neg ? trunc_value : trunc_value + T(1.0);
+  case FP_INT_TOWARDZERO:
+    return trunc_value;
+  case FP_INT_TONEARESTFROMZERO:
+    if (trim_value >= half_value)
+      return is_neg ? trunc_value - T(1.0) : trunc_value + T(1.0);
+    return trunc_value;
+  case FP_INT_TONEAREST:
+  default:
+    if (trim_value > half_value) {
+      return is_neg ? trunc_value - T(1.0) : trunc_value + T(1.0);
+    } else if (trim_value == half_value) {
+      if (exponent == 0)
+        return is_neg ? T(-2.0) : T(2.0);
+      if (trunc_is_odd)
+        return is_neg ? trunc_value - T(1.0) : trunc_value + T(1.0);
+      else
+        return trunc_value;
+    } else {
+      return trunc_value;
+    }
+  }
+}
+
+template <typename T>
+LIBC_INLINE cpp::enable_if_t<cpp::is_floating_point_v<T>, T>
+round_using_current_rounding_mode(T x) {
+  int rounding_mode = quick_get_round();
+
+  switch (rounding_mode) {
+  case FE_DOWNWARD:
+    return round_using_specific_rounding_mode(x, FP_INT_DOWNWARD);
+  case FE_UPWARD:
+    return round_using_specific_rounding_mode(x, FP_INT_UPWARD);
+  case FE_TOWARDZERO:
+    return round_using_specific_rounding_mode(x, FP_INT_TOWARDZERO);
+  case FE_TONEAREST:
+    return round_using_specific_rounding_mode(x, FP_INT_TONEAREST);
+  default:
+    __builtin_unreachable();
+  }
+}
+
+template <bool IsSigned, typename T>
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_floating_point_v<T>, T>
+fromfp(T x, int rnd, unsigned int width) {
+  using StorageType = typename FPBits<T>::StorageType;
+
+  constexpr StorageType EXPLICIT_BIT =
+      FPBits<T>::SIG_MASK - FPBits<T>::FRACTION_MASK;
+
+  if (width == 0U) {
+    raise_except_if_required(FE_INVALID);
+    return FPBits<T>::quiet_nan().get_val();
+  }
+
+  FPBits<T> bits(x);
+
+  if (bits.is_inf_or_nan()) {
+    raise_except_if_required(FE_INVALID);
+    return FPBits<T>::quiet_nan().get_val();
+  }
+
+  T rounded_value = round_using_specific_rounding_mode(x, rnd);
+
+  if constexpr (IsSigned) {
+    // T can't hold a finite number >= 2.0 * 2^EXP_BIAS.
+    if (width - 1 > FPBits<T>::EXP_BIAS)
+      return rounded_value;
+
+    StorageType range_exp =
+        static_cast<StorageType>(width - 1 + FPBits<T>::EXP_BIAS);
+    // rounded_value < -2^(width - 1)
+    T range_min =
+        FPBits<T>::create_value(Sign::NEG, range_exp, EXPLICIT_BIT).get_val();
+    if (rounded_value < range_min) {
+      raise_except_if_required(FE_INVALID);
+      return FPBits<T>::quiet_nan().get_val();
+    }
+    // rounded_value > 2^(width - 1) - 1
+    T range_max =
+        FPBits<T>::create_value(Sign::POS, range_exp, EXPLICIT_BIT).get_val() -
+        T(1.0);
+    if (rounded_value > range_max) {
+      raise_except_if_required(FE_INVALID);
+      return FPBits<T>::quiet_nan().get_val();
+    }
+
+    return rounded_value;
+  }
+
+  if (rounded_value < T(0.0)) {
+    raise_except_if_required(FE_INVALID);
+    return FPBits<T>::quiet_nan().get_val();
+  }
+
+  // T can't hold a finite number >= 2.0 * 2^EXP_BIAS.
+  if (width > FPBits<T>::EXP_BIAS)
+    return rounded_value;
+
+  StorageType range_exp = static_cast<StorageType>(width + FPBits<T>::EXP_BIAS);
+  // rounded_value > 2^width - 1
+  T range_max =
+      FPBits<T>::create_value(Sign::POS, range_exp, EXPLICIT_BIT).get_val() -
+      T(1.0);
+  if (rounded_value > range_max) {
+    raise_except_if_required(FE_INVALID);
+    return FPBits<T>::quiet_nan().get_val();
+  }
+
+  return rounded_value;
+}
+
+template <bool IsSigned, typename T>
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_floating_point_v<T>, T>
+fromfpx(T x, int rnd, unsigned int width) {
+  T rounded_value = fromfp<IsSigned>(x, rnd, width);
+  FPBits<T> bits(rounded_value);
+
+  if (!bits.is_nan() && rounded_value != x)
+    raise_except_if_required(FE_INEXACT);
+
+  return rounded_value;
+}
+
+namespace internal {
+
+template <typename FloatType, typename IntType,
+          cpp::enable_if_t<cpp::is_floating_point_v<FloatType> &&
+                               cpp::is_integral_v<IntType>,
+                           int> = 0>
+LIBC_INLINE IntType rounded_float_to_signed_integer(FloatType x) {
+  constexpr IntType INTEGER_MIN = (IntType(1) << (sizeof(IntType) * 8 - 1));
+  constexpr IntType INTEGER_MAX = -(INTEGER_MIN + 1);
+  FPBits<FloatType> bits(x);
+  auto set_domain_error_and_raise_invalid = []() {
+    set_errno_if_required(EDOM);
+    raise_except_if_required(FE_INVALID);
+  };
+
+  if (bits.is_inf_or_nan()) {
+    set_domain_error_and_raise_invalid();
+    return bits.is_neg() ? INTEGER_MIN : INTEGER_MAX;
+  }
+
+  int exponent = bits.get_exponent();
+  constexpr int EXPONENT_LIMIT = sizeof(IntType) * 8 - 1;
+  if (exponent > EXPONENT_LIMIT) {
+    set_domain_error_and_raise_invalid();
+    return bits.is_neg() ? INTEGER_MIN : INTEGER_MAX;
+  } else if (exponent == EXPONENT_LIMIT) {
+    if (bits.is_pos() || bits.get_mantissa() != 0) {
+      set_domain_error_and_raise_invalid();
+      return bits.is_neg() ? INTEGER_MIN : INTEGER_MAX;
+    }
+    // If the control reaches here, then it means that the rounded
+    // value is the most negative number for the signed integer type IntType.
+  }
+
+  // For all other cases, if `x` can fit in the integer type `IntType`,
+  // we just return `x`. static_cast will convert the floating
+  // point value to the exact integer value.
+  return static_cast<IntType>(x);
+}
+
+} // namespace internal
+
+template <typename FloatType, typename IntType,
+          cpp::enable_if_t<cpp::is_floating_point_v<FloatType> &&
+                               cpp::is_integral_v<IntType>,
+                           int> = 0>
+LIBC_INLINE IntType round_to_signed_integer(FloatType x) {
+  return internal::rounded_float_to_signed_integer<FloatType, IntType>(
+      round(x));
+}
+
+template <typename FloatType, typename IntType,
+          cpp::enable_if_t<cpp::is_floating_point_v<FloatType> &&
+                               cpp::is_integral_v<IntType>,
+                           int> = 0>
+LIBC_INLINE IntType
+round_to_signed_integer_using_current_rounding_mode(FloatType x) {
+  return internal::rounded_float_to_signed_integer<FloatType, IntType>(
+      round_using_current_rounding_mode(x));
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_NEARESTINTEGEROPERATIONS_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/NormalFloat.h b/contrib/llvm-project/libc/src/__support/FPUtil/NormalFloat.h
new file mode 100644
index 000000000000..a2f285fc6fb9
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/NormalFloat.h
@@ -0,0 +1,273 @@
+//===-- A class to store a normalized floating point number -----*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_NORMALFLOAT_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_NORMALFLOAT_H
+
+#include "FPBits.h"
+
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+// A class which stores the normalized form of a floating point value.
+// The special IEEE-754 bits patterns of Zero, infinity and NaNs are
+// are not handled by this class.
+//
+// A normalized floating point number is of this form:
+//    (-1)*sign * 2^exponent * <mantissa>
+// where <mantissa> is of the form 1.<...>.
+template <typename T> struct NormalFloat {
+  static_assert(
+      cpp::is_floating_point_v<T>,
+      "NormalFloat template parameter has to be a floating point type.");
+
+  using StorageType = typename FPBits<T>::StorageType;
+  static constexpr StorageType ONE =
+      (StorageType(1) << FPBits<T>::FRACTION_LEN);
+
+  // Unbiased exponent value.
+  int32_t exponent;
+
+  StorageType mantissa;
+  // We want |StorageType| to have atleast one bit more than the actual mantissa
+  // bit width to accommodate the implicit 1 value.
+  static_assert(sizeof(StorageType) * 8 >= FPBits<T>::FRACTION_LEN + 1,
+                "Bad type for mantissa in NormalFloat.");
+
+  Sign sign = Sign::POS;
+
+  LIBC_INLINE NormalFloat(Sign s, int32_t e, StorageType m)
+      : exponent(e), mantissa(m), sign(s) {
+    if (mantissa >= ONE)
+      return;
+
+    unsigned normalization_shift = evaluate_normalization_shift(mantissa);
+    mantissa <<= normalization_shift;
+    exponent -= normalization_shift;
+  }
+
+  LIBC_INLINE explicit NormalFloat(T x) { init_from_bits(FPBits<T>(x)); }
+
+  LIBC_INLINE explicit NormalFloat(FPBits<T> bits) { init_from_bits(bits); }
+
+  // Compares this normalized number with another normalized number.
+  // Returns -1 is this number is less than |other|, 0 if this number is equal
+  // to |other|, and 1 if this number is greater than |other|.
+  LIBC_INLINE int cmp(const NormalFloat<T> &other) const {
+    const int result = sign.is_neg() ? -1 : 1;
+    if (sign != other.sign)
+      return result;
+
+    if (exponent > other.exponent) {
+      return result;
+    } else if (exponent == other.exponent) {
+      if (mantissa > other.mantissa)
+        return result;
+      else if (mantissa == other.mantissa)
+        return 0;
+      else
+        return -result;
+    } else {
+      return -result;
+    }
+  }
+
+  // Returns a new normalized floating point number which is equal in value
+  // to this number multiplied by 2^e. That is:
+  //     new = this *  2^e
+  LIBC_INLINE NormalFloat<T> mul2(int e) const {
+    NormalFloat<T> result = *this;
+    result.exponent += e;
+    return result;
+  }
+
+  LIBC_INLINE operator T() const {
+    int biased_exponent = exponent + FPBits<T>::EXP_BIAS;
+    // Max exponent is of the form 0xFF...E. That is why -2 and not -1.
+    constexpr int MAX_EXPONENT_VALUE = (1 << FPBits<T>::EXP_LEN) - 2;
+    if (biased_exponent > MAX_EXPONENT_VALUE) {
+      return FPBits<T>::inf(sign).get_val();
+    }
+
+    FPBits<T> result(T(0.0));
+    result.set_sign(sign);
+
+    constexpr int SUBNORMAL_EXPONENT = -FPBits<T>::EXP_BIAS + 1;
+    if (exponent < SUBNORMAL_EXPONENT) {
+      unsigned shift = static_cast<unsigned>(SUBNORMAL_EXPONENT - exponent);
+      // Since exponent > subnormalExponent, shift is strictly greater than
+      // zero.
+      if (shift <= FPBits<T>::FRACTION_LEN + 1) {
+        // Generate a subnormal number. Might lead to loss of precision.
+        // We round to nearest and round halfway cases to even.
+        const StorageType shift_out_mask =
+            static_cast<StorageType>(StorageType(1) << shift) - 1;
+        const StorageType shift_out_value = mantissa & shift_out_mask;
+        const StorageType halfway_value =
+            static_cast<StorageType>(StorageType(1) << (shift - 1));
+        result.set_biased_exponent(0);
+        result.set_mantissa(mantissa >> shift);
+        StorageType new_mantissa = result.get_mantissa();
+        if (shift_out_value > halfway_value) {
+          new_mantissa += 1;
+        } else if (shift_out_value == halfway_value) {
+          // Round to even.
+          if (result.get_mantissa() & 0x1)
+            new_mantissa += 1;
+        }
+        result.set_mantissa(new_mantissa);
+        // Adding 1 to mantissa can lead to overflow. This can only happen if
+        // mantissa was all ones (0b111..11). For such a case, we will carry
+        // the overflow into the exponent.
+        if (new_mantissa == ONE)
+          result.set_biased_exponent(1);
+        return result.get_val();
+      } else {
+        return result.get_val();
+      }
+    }
+
+    result.set_biased_exponent(
+        static_cast<StorageType>(exponent + FPBits<T>::EXP_BIAS));
+    result.set_mantissa(mantissa);
+    return result.get_val();
+  }
+
+private:
+  LIBC_INLINE void init_from_bits(FPBits<T> bits) {
+    sign = bits.sign();
+
+    if (bits.is_inf_or_nan() || bits.is_zero()) {
+      // Ignore special bit patterns. Implementations deal with them separately
+      // anyway so this should not be a problem.
+      exponent = 0;
+      mantissa = 0;
+      return;
+    }
+
+    // Normalize subnormal numbers.
+    if (bits.is_subnormal()) {
+      unsigned shift = evaluate_normalization_shift(bits.get_mantissa());
+      mantissa = static_cast<StorageType>(bits.get_mantissa() << shift);
+      exponent = 1 - FPBits<T>::EXP_BIAS - static_cast<int32_t>(shift);
+    } else {
+      exponent = bits.get_biased_exponent() - FPBits<T>::EXP_BIAS;
+      mantissa = ONE | bits.get_mantissa();
+    }
+  }
+
+  LIBC_INLINE unsigned evaluate_normalization_shift(StorageType m) {
+    unsigned shift = 0;
+    for (; (ONE & m) == 0 && (shift < FPBits<T>::FRACTION_LEN);
+         m <<= 1, ++shift)
+      ;
+    return shift;
+  }
+};
+
+#ifdef LIBC_TYPES_LONG_DOUBLE_IS_X86_FLOAT80
+template <>
+LIBC_INLINE void
+NormalFloat<long double>::init_from_bits(FPBits<long double> bits) {
+  sign = bits.sign();
+
+  if (bits.is_inf_or_nan() || bits.is_zero()) {
+    // Ignore special bit patterns. Implementations deal with them separately
+    // anyway so this should not be a problem.
+    exponent = 0;
+    mantissa = 0;
+    return;
+  }
+
+  if (bits.is_subnormal()) {
+    if (bits.get_implicit_bit() == 0) {
+      // Since we ignore zero value, the mantissa in this case is non-zero.
+      int normalization_shift =
+          evaluate_normalization_shift(bits.get_mantissa());
+      exponent = -16382 - normalization_shift;
+      mantissa = (bits.get_mantissa() << normalization_shift);
+    } else {
+      exponent = -16382;
+      mantissa = ONE | bits.get_mantissa();
+    }
+  } else {
+    if (bits.get_implicit_bit() == 0) {
+      // Invalid number so just store 0 similar to a NaN.
+      exponent = 0;
+      mantissa = 0;
+    } else {
+      exponent = bits.get_biased_exponent() - 16383;
+      mantissa = ONE | bits.get_mantissa();
+    }
+  }
+}
+
+template <> LIBC_INLINE NormalFloat<long double>::operator long double() const {
+  using LDBits = FPBits<long double>;
+  int biased_exponent = exponent + LDBits::EXP_BIAS;
+  // Max exponent is of the form 0xFF...E. That is why -2 and not -1.
+  constexpr int MAX_EXPONENT_VALUE = (1 << LDBits::EXP_LEN) - 2;
+  if (biased_exponent > MAX_EXPONENT_VALUE) {
+    return LDBits::inf(sign).get_val();
+  }
+
+  FPBits<long double> result(0.0l);
+  result.set_sign(sign);
+
+  constexpr int SUBNORMAL_EXPONENT = -LDBits::EXP_BIAS + 1;
+  if (exponent < SUBNORMAL_EXPONENT) {
+    unsigned shift = SUBNORMAL_EXPONENT - exponent;
+    if (shift <= LDBits::FRACTION_LEN + 1) {
+      // Generate a subnormal number. Might lead to loss of precision.
+      // We round to nearest and round halfway cases to even.
+      const StorageType shift_out_mask = (StorageType(1) << shift) - 1;
+      const StorageType shift_out_value = mantissa & shift_out_mask;
+      const StorageType halfway_value = StorageType(1) << (shift - 1);
+      result.set_biased_exponent(0);
+      result.set_mantissa(mantissa >> shift);
+      StorageType new_mantissa = result.get_mantissa();
+      if (shift_out_value > halfway_value) {
+        new_mantissa += 1;
+      } else if (shift_out_value == halfway_value) {
+        // Round to even.
+        if (result.get_mantissa() & 0x1)
+          new_mantissa += 1;
+      }
+      result.set_mantissa(new_mantissa);
+      // Adding 1 to mantissa can lead to overflow. This can only happen if
+      // mantissa was all ones (0b111..11). For such a case, we will carry
+      // the overflow into the exponent and set the implicit bit to 1.
+      if (new_mantissa == ONE) {
+        result.set_biased_exponent(1);
+        result.set_implicit_bit(1);
+      } else {
+        result.set_implicit_bit(0);
+      }
+      return result.get_val();
+    } else {
+      return result.get_val();
+    }
+  }
+
+  result.set_biased_exponent(biased_exponent);
+  result.set_mantissa(mantissa);
+  result.set_implicit_bit(1);
+  return result.get_val();
+}
+#endif // LIBC_TYPES_LONG_DOUBLE_IS_X86_FLOAT80
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_NORMALFLOAT_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/PolyEval.h b/contrib/llvm-project/libc/src/__support/FPUtil/PolyEval.h
new file mode 100644
index 000000000000..41104620ed61
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/PolyEval.h
@@ -0,0 +1,54 @@
+//===-- Common header for PolyEval implementations --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_POLYEVAL_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_POLYEVAL_H
+
+#include "multiply_add.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+// Evaluate polynomial using Horner's Scheme:
+// With polyeval(x, a_0, a_1, ..., a_n) = a_n * x^n + ... + a_1 * x + a_0, we
+// evaluated it as:  a_0 + x * (a_1 + x * ( ... (a_(n-1) + x * a_n) ... ) ) ).
+// We will use FMA instructions if available.
+// Example: to evaluate x^3 + 2*x^2 + 3*x + 4, call
+//   polyeval( x, 4.0, 3.0, 2.0, 1.0 )
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+template <typename T>
+LIBC_INLINE cpp::enable_if_t<(sizeof(T) > sizeof(void *)), T>
+polyeval(const T &, const T &a0) {
+  return a0;
+}
+
+template <typename T>
+LIBC_INLINE cpp::enable_if_t<(sizeof(T) <= sizeof(void *)), T> polyeval(T,
+                                                                        T a0) {
+  return a0;
+}
+
+template <typename T, typename... Ts>
+LIBC_INLINE cpp::enable_if_t<(sizeof(T) > sizeof(void *)), T>
+polyeval(const T &x, const T &a0, const Ts &...a) {
+  return multiply_add(x, polyeval(x, a...), a0);
+}
+
+template <typename T, typename... Ts>
+LIBC_INLINE cpp::enable_if_t<(sizeof(T) <= sizeof(void *)), T>
+polyeval(T x, T a0, Ts... a) {
+  return multiply_add(x, polyeval(x, a...), a0);
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_POLYEVAL_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/aarch64/FEnvImpl.h b/contrib/llvm-project/libc/src/__support/FPUtil/aarch64/FEnvImpl.h
new file mode 100644
index 000000000000..914155a01631
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/aarch64/FEnvImpl.h
@@ -0,0 +1,285 @@
+//===-- aarch64 floating point env manipulation functions -------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_AARCH64_FENVIMPL_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_AARCH64_FENVIMPL_H
+
+#include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+
+#if !defined(LIBC_TARGET_ARCH_IS_AARCH64) || defined(__APPLE__)
+#error "Invalid include"
+#endif
+
+#include <arm_acle.h>
+#include <stdint.h>
+
+#include "hdr/fenv_macros.h"
+#include "hdr/types/fenv_t.h"
+#include "src/__support/FPUtil/FPBits.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+struct FEnv {
+  struct FPState {
+    uint32_t ControlWord;
+    uint32_t StatusWord;
+  };
+
+  static_assert(
+      sizeof(fenv_t) == sizeof(FPState),
+      "Internal floating point state does not match the public fenv_t type.");
+
+  static constexpr uint32_t TONEAREST = 0x0;
+  static constexpr uint32_t UPWARD = 0x1;
+  static constexpr uint32_t DOWNWARD = 0x2;
+  static constexpr uint32_t TOWARDZERO = 0x3;
+
+  static constexpr uint32_t INVALID_F = 0x1;
+  static constexpr uint32_t DIVBYZERO_F = 0x2;
+  static constexpr uint32_t OVERFLOW_F = 0x4;
+  static constexpr uint32_t UNDERFLOW_F = 0x8;
+  static constexpr uint32_t INEXACT_F = 0x10;
+
+  // Zero-th bit is the first bit.
+  static constexpr uint32_t RoundingControlBitPosition = 22;
+  static constexpr uint32_t ExceptionStatusFlagsBitPosition = 0;
+  static constexpr uint32_t ExceptionControlFlagsBitPosition = 8;
+
+  LIBC_INLINE static uint32_t getStatusValueForExcept(int excepts) {
+    return ((excepts & FE_INVALID) ? INVALID_F : 0) |
+           ((excepts & FE_DIVBYZERO) ? DIVBYZERO_F : 0) |
+           ((excepts & FE_OVERFLOW) ? OVERFLOW_F : 0) |
+           ((excepts & FE_UNDERFLOW) ? UNDERFLOW_F : 0) |
+           ((excepts & FE_INEXACT) ? INEXACT_F : 0);
+  }
+
+  LIBC_INLINE static int exceptionStatusToMacro(uint32_t status) {
+    return ((status & INVALID_F) ? FE_INVALID : 0) |
+           ((status & DIVBYZERO_F) ? FE_DIVBYZERO : 0) |
+           ((status & OVERFLOW_F) ? FE_OVERFLOW : 0) |
+           ((status & UNDERFLOW_F) ? FE_UNDERFLOW : 0) |
+           ((status & INEXACT_F) ? FE_INEXACT : 0);
+  }
+
+  static uint32_t getControlWord() {
+#ifdef __clang__
+    // GCC does not currently support __arm_rsr.
+    return __arm_rsr("fpcr");
+#else
+    return __builtin_aarch64_get_fpcr();
+#endif
+  }
+
+  static void writeControlWord(uint32_t fpcr) {
+#ifdef __clang__
+    // GCC does not currently support __arm_wsr.
+    __arm_wsr("fpcr", fpcr);
+#else
+    __builtin_aarch64_set_fpcr(fpcr);
+#endif
+  }
+
+  static uint32_t getStatusWord() {
+#ifdef __clang__
+    return __arm_rsr("fpsr");
+#else
+    return __builtin_aarch64_get_fpsr();
+#endif
+  }
+
+  static void writeStatusWord(uint32_t fpsr) {
+#ifdef __clang__
+    __arm_wsr("fpsr", fpsr);
+#else
+    __builtin_aarch64_set_fpsr(fpsr);
+#endif
+  }
+};
+
+LIBC_INLINE int enable_except(int excepts) {
+  uint32_t newExcepts = FEnv::getStatusValueForExcept(excepts);
+  uint32_t controlWord = FEnv::getControlWord();
+  int oldExcepts =
+      (controlWord >> FEnv::ExceptionControlFlagsBitPosition) & 0x1F;
+  controlWord |= (newExcepts << FEnv::ExceptionControlFlagsBitPosition);
+  FEnv::writeControlWord(controlWord);
+  return FEnv::exceptionStatusToMacro(static_cast<uint32_t>(oldExcepts));
+}
+
+LIBC_INLINE int disable_except(int excepts) {
+  uint32_t disabledExcepts = FEnv::getStatusValueForExcept(excepts);
+  uint32_t controlWord = FEnv::getControlWord();
+  int oldExcepts =
+      (controlWord >> FEnv::ExceptionControlFlagsBitPosition) & 0x1F;
+  controlWord &= ~(disabledExcepts << FEnv::ExceptionControlFlagsBitPosition);
+  FEnv::writeControlWord(controlWord);
+  return FEnv::exceptionStatusToMacro(static_cast<uint32_t>(oldExcepts));
+}
+
+LIBC_INLINE int get_except() {
+  uint32_t controlWord = FEnv::getControlWord();
+  uint32_t enabledExcepts =
+      (controlWord >> FEnv::ExceptionControlFlagsBitPosition) & 0x1F;
+  return FEnv::exceptionStatusToMacro(enabledExcepts);
+}
+
+LIBC_INLINE int clear_except(int excepts) {
+  uint32_t statusWord = FEnv::getStatusWord();
+  uint32_t toClear = FEnv::getStatusValueForExcept(excepts);
+  statusWord &= ~(toClear << FEnv::ExceptionStatusFlagsBitPosition);
+  FEnv::writeStatusWord(statusWord);
+  return 0;
+}
+
+LIBC_INLINE int test_except(int excepts) {
+  uint32_t toTest = FEnv::getStatusValueForExcept(excepts);
+  uint32_t statusWord = FEnv::getStatusWord();
+  return FEnv::exceptionStatusToMacro(
+      (statusWord >> FEnv::ExceptionStatusFlagsBitPosition) & toTest);
+}
+
+LIBC_INLINE int set_except(int excepts) {
+  uint32_t statusWord = FEnv::getStatusWord();
+  uint32_t statusValue = FEnv::getStatusValueForExcept(excepts);
+  statusWord |= (statusValue << FEnv::ExceptionStatusFlagsBitPosition);
+  FEnv::writeStatusWord(statusWord);
+  return 0;
+}
+
+LIBC_INLINE int raise_except(int excepts) {
+  float zero = 0.0f;
+  float one = 1.0f;
+  float largeValue = FPBits<float>::max_normal().get_val();
+  float smallValue = FPBits<float>::min_normal().get_val();
+  auto divfunc = [](float a, float b) {
+    __asm__ __volatile__("ldr  s0, %0\n\t"
+                         "ldr  s1, %1\n\t"
+                         "fdiv s0, s0, s1\n\t"
+                         : // No outputs
+                         : "m"(a), "m"(b)
+                         : "s0", "s1" /* s0 and s1 are clobbered */);
+  };
+
+  uint32_t toRaise = FEnv::getStatusValueForExcept(excepts);
+  int result = 0;
+
+  if (toRaise & FEnv::INVALID_F) {
+    divfunc(zero, zero);
+    uint32_t statusWord = FEnv::getStatusWord();
+    if (!((statusWord >> FEnv::ExceptionStatusFlagsBitPosition) &
+          FEnv::INVALID_F))
+      result = -1;
+  }
+
+  if (toRaise & FEnv::DIVBYZERO_F) {
+    divfunc(one, zero);
+    uint32_t statusWord = FEnv::getStatusWord();
+    if (!((statusWord >> FEnv::ExceptionStatusFlagsBitPosition) &
+          FEnv::DIVBYZERO_F))
+      result = -1;
+  }
+  if (toRaise & FEnv::OVERFLOW_F) {
+    divfunc(largeValue, smallValue);
+    uint32_t statusWord = FEnv::getStatusWord();
+    if (!((statusWord >> FEnv::ExceptionStatusFlagsBitPosition) &
+          FEnv::OVERFLOW_F))
+      result = -1;
+  }
+  if (toRaise & FEnv::UNDERFLOW_F) {
+    divfunc(smallValue, largeValue);
+    uint32_t statusWord = FEnv::getStatusWord();
+    if (!((statusWord >> FEnv::ExceptionStatusFlagsBitPosition) &
+          FEnv::UNDERFLOW_F))
+      result = -1;
+  }
+  if (toRaise & FEnv::INEXACT_F) {
+    float two = 2.0f;
+    float three = 3.0f;
+    // 2.0 / 3.0 cannot be represented exactly in any radix 2 floating point
+    // format.
+    divfunc(two, three);
+    uint32_t statusWord = FEnv::getStatusWord();
+    if (!((statusWord >> FEnv::ExceptionStatusFlagsBitPosition) &
+          FEnv::INEXACT_F))
+      result = -1;
+  }
+  return result;
+}
+
+LIBC_INLINE int get_round() {
+  uint32_t roundingMode =
+      (FEnv::getControlWord() >> FEnv::RoundingControlBitPosition) & 0x3;
+  switch (roundingMode) {
+  case FEnv::TONEAREST:
+    return FE_TONEAREST;
+  case FEnv::DOWNWARD:
+    return FE_DOWNWARD;
+  case FEnv::UPWARD:
+    return FE_UPWARD;
+  case FEnv::TOWARDZERO:
+    return FE_TOWARDZERO;
+  default:
+    return -1; // Error value.
+  }
+}
+
+LIBC_INLINE int set_round(int mode) {
+  uint16_t bitValue;
+  switch (mode) {
+  case FE_TONEAREST:
+    bitValue = FEnv::TONEAREST;
+    break;
+  case FE_DOWNWARD:
+    bitValue = FEnv::DOWNWARD;
+    break;
+  case FE_UPWARD:
+    bitValue = FEnv::UPWARD;
+    break;
+  case FE_TOWARDZERO:
+    bitValue = FEnv::TOWARDZERO;
+    break;
+  default:
+    return 1; // To indicate failure
+  }
+
+  uint32_t controlWord = FEnv::getControlWord();
+  controlWord &=
+      static_cast<uint32_t>(~(0x3 << FEnv::RoundingControlBitPosition));
+  controlWord |=
+      static_cast<uint32_t>(bitValue << FEnv::RoundingControlBitPosition);
+  FEnv::writeControlWord(controlWord);
+
+  return 0;
+}
+
+LIBC_INLINE int get_env(fenv_t *envp) {
+  FEnv::FPState *state = reinterpret_cast<FEnv::FPState *>(envp);
+  state->ControlWord = FEnv::getControlWord();
+  state->StatusWord = FEnv::getStatusWord();
+  return 0;
+}
+
+LIBC_INLINE int set_env(const fenv_t *envp) {
+  if (envp == FE_DFL_ENV) {
+    // Default status and control words bits are all zeros so we just
+    // write zeros.
+    FEnv::writeStatusWord(0);
+    FEnv::writeControlWord(0);
+    return 0;
+  }
+  const FEnv::FPState *state = reinterpret_cast<const FEnv::FPState *>(envp);
+  FEnv::writeControlWord(state->ControlWord);
+  FEnv::writeStatusWord(state->StatusWord);
+  return 0;
+}
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_AARCH64_FENVIMPL_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/aarch64/fenv_darwin_impl.h b/contrib/llvm-project/libc/src/__support/FPUtil/aarch64/fenv_darwin_impl.h
new file mode 100644
index 000000000000..dcce76b6116b
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/aarch64/fenv_darwin_impl.h
@@ -0,0 +1,297 @@
+//===- darwin-aarch64 floating point env manipulation functions -*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_AARCH64_FENV_DARWIN_IMPL_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_AARCH64_FENV_DARWIN_IMPL_H
+
+#include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+
+#if !defined(LIBC_TARGET_ARCH_IS_AARCH64) || !defined(__APPLE__)
+#error "Invalid include"
+#endif
+
+#include <arm_acle.h>
+#include <stdint.h>
+
+#include "hdr/fenv_macros.h"
+#include "hdr/types/fenv_t.h"
+#include "src/__support/FPUtil/FPBits.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+struct FEnv {
+  struct FPState {
+    uint64_t StatusWord;
+    uint64_t ControlWord;
+  };
+
+  static_assert(
+      sizeof(fenv_t) == sizeof(FPState),
+      "Internal floating point state does not match the public fenv_t type.");
+
+  static constexpr uint32_t TONEAREST = 0x0;
+  static constexpr uint32_t UPWARD = 0x1;
+  static constexpr uint32_t DOWNWARD = 0x2;
+  static constexpr uint32_t TOWARDZERO = 0x3;
+
+  // These will be the exception flags we use for exception values normalized
+  // from both status word and control word.
+  // We add EX_ prefix to the names since macOS <math.h> defines OVERFLOW and
+  // UNDERFLOW macros.
+  static constexpr uint32_t EX_INVALID = 0x1;
+  static constexpr uint32_t EX_DIVBYZERO = 0x2;
+  static constexpr uint32_t EX_OVERFLOW = 0x4;
+  static constexpr uint32_t EX_UNDERFLOW = 0x8;
+  static constexpr uint32_t EX_INEXACT = 0x10;
+  // __APPLE__ ARM64 has an extra flag that is raised when a denormal is flushed
+  // to zero.
+  static constexpr uint32_t EX_FLUSHTOZERO = 0x20;
+
+  // Zero-th bit is the first bit.
+  static constexpr uint32_t ROUNDING_CONTROL_BIT_POSITION = 22;
+
+  // In addition to the 5 floating point exceptions, macOS on arm64 defines
+  // another floating point exception: FE_FLUSHTOZERO, which is controlled by
+  // __fpcr_flush_to_zero bit in the FPCR register.  This control bit is
+  // located in a different place from FE_FLUSHTOZERO status bit relative to
+  // the other exceptions.
+  LIBC_INLINE static uint32_t exception_value_from_status(uint32_t status) {
+    return ((status & FE_INVALID) ? EX_INVALID : 0) |
+           ((status & FE_DIVBYZERO) ? EX_DIVBYZERO : 0) |
+           ((status & FE_OVERFLOW) ? EX_OVERFLOW : 0) |
+           ((status & FE_UNDERFLOW) ? EX_UNDERFLOW : 0) |
+           ((status & FE_INEXACT) ? EX_INEXACT : 0) |
+           ((status & FE_FLUSHTOZERO) ? EX_FLUSHTOZERO : 0);
+  }
+
+  LIBC_INLINE static uint32_t exception_value_from_control(uint32_t control) {
+    return ((control & __fpcr_trap_invalid) ? EX_INVALID : 0) |
+           ((control & __fpcr_trap_divbyzero) ? EX_DIVBYZERO : 0) |
+           ((control & __fpcr_trap_overflow) ? EX_OVERFLOW : 0) |
+           ((control & __fpcr_trap_underflow) ? EX_UNDERFLOW : 0) |
+           ((control & __fpcr_trap_inexact) ? EX_INEXACT : 0) |
+           ((control & __fpcr_flush_to_zero) ? EX_FLUSHTOZERO : 0);
+  }
+
+  LIBC_INLINE static uint32_t exception_value_to_status(uint32_t excepts) {
+    return ((excepts & EX_INVALID) ? FE_INVALID : 0) |
+           ((excepts & EX_DIVBYZERO) ? FE_DIVBYZERO : 0) |
+           ((excepts & EX_OVERFLOW) ? FE_OVERFLOW : 0) |
+           ((excepts & EX_UNDERFLOW) ? FE_UNDERFLOW : 0) |
+           ((excepts & EX_INEXACT) ? FE_INEXACT : 0) |
+           ((excepts & EX_FLUSHTOZERO) ? FE_FLUSHTOZERO : 0);
+  }
+
+  LIBC_INLINE static uint32_t exception_value_to_control(uint32_t excepts) {
+    return ((excepts & EX_INVALID) ? __fpcr_trap_invalid : 0) |
+           ((excepts & EX_DIVBYZERO) ? __fpcr_trap_divbyzero : 0) |
+           ((excepts & EX_OVERFLOW) ? __fpcr_trap_overflow : 0) |
+           ((excepts & EX_UNDERFLOW) ? __fpcr_trap_underflow : 0) |
+           ((excepts & EX_INEXACT) ? __fpcr_trap_inexact : 0) |
+           ((excepts & EX_FLUSHTOZERO) ? __fpcr_flush_to_zero : 0);
+  }
+
+  LIBC_INLINE static uint32_t get_control_word() { return __arm_rsr("fpcr"); }
+
+  LIBC_INLINE static void set_control_word(uint32_t fpcr) {
+    __arm_wsr("fpcr", fpcr);
+  }
+
+  LIBC_INLINE static uint32_t get_status_word() { return __arm_rsr("fpsr"); }
+
+  LIBC_INLINE static void set_status_word(uint32_t fpsr) {
+    __arm_wsr("fpsr", fpsr);
+  }
+};
+
+LIBC_INLINE int enable_except(int excepts) {
+  uint32_t new_excepts =
+      FEnv::exception_value_from_status(static_cast<uint32_t>(excepts));
+  uint32_t control_word = FEnv::get_control_word();
+  uint32_t old_excepts = FEnv::exception_value_from_control(control_word);
+  if (new_excepts != old_excepts) {
+    control_word |= FEnv::exception_value_to_control(new_excepts);
+    FEnv::set_control_word(control_word);
+  }
+  return static_cast<int>(FEnv::exception_value_to_status(old_excepts));
+}
+
+LIBC_INLINE int disable_except(int excepts) {
+  uint32_t disabled_excepts =
+      FEnv::exception_value_from_status(static_cast<uint32_t>(excepts));
+  uint32_t control_word = FEnv::get_control_word();
+  uint32_t old_excepts = FEnv::exception_value_from_control(control_word);
+  control_word &= ~FEnv::exception_value_to_control(disabled_excepts);
+  FEnv::set_control_word(control_word);
+  return static_cast<int>(FEnv::exception_value_to_status(old_excepts));
+}
+
+LIBC_INLINE int get_except() {
+  uint32_t control_word = FEnv::get_control_word();
+  uint32_t enabled_excepts = FEnv::exception_value_from_control(control_word);
+  return static_cast<int>(FEnv::exception_value_to_status(enabled_excepts));
+}
+
+LIBC_INLINE int clear_except(int excepts) {
+  uint32_t status_word = FEnv::get_status_word();
+  uint32_t except_value =
+      FEnv::exception_value_from_status(static_cast<uint32_t>(excepts));
+  status_word &= ~FEnv::exception_value_to_status(except_value);
+  FEnv::set_status_word(status_word);
+  return 0;
+}
+
+LIBC_INLINE int test_except(int excepts) {
+  uint32_t statusWord = FEnv::get_status_word();
+  uint32_t ex_value =
+      FEnv::exception_value_from_status(static_cast<uint32_t>(excepts));
+  return static_cast<int>(statusWord &
+                          FEnv::exception_value_to_status(ex_value));
+}
+
+LIBC_INLINE int set_except(int excepts) {
+  uint32_t status_word = FEnv::get_status_word();
+  uint32_t new_exceptions =
+      FEnv::exception_value_from_status(static_cast<uint32_t>(excepts));
+  status_word |= FEnv::exception_value_to_status(new_exceptions);
+  FEnv::set_status_word(status_word);
+  return 0;
+}
+
+LIBC_INLINE int raise_except(int excepts) {
+  float zero = 0.0f;
+  float one = 1.0f;
+  float large_value = FPBits<float>::max_normal().get_val();
+  float small_value = FPBits<float>::min_normal().get_val();
+  auto divfunc = [](float a, float b) {
+    __asm__ __volatile__("ldr  s0, %0\n\t"
+                         "ldr  s1, %1\n\t"
+                         "fdiv s0, s0, s1\n\t"
+                         : // No outputs
+                         : "m"(a), "m"(b)
+                         : "s0", "s1" /* s0 and s1 are clobbered */);
+  };
+
+  uint32_t to_raise =
+      FEnv::exception_value_from_status(static_cast<uint32_t>(excepts));
+  int result = 0;
+
+  if (to_raise & FEnv::EX_INVALID) {
+    divfunc(zero, zero);
+    uint32_t status_word = FEnv::get_status_word();
+    if (!(FEnv::exception_value_from_status(status_word) & FEnv::EX_INVALID))
+      result = -1;
+  }
+
+  if (to_raise & FEnv::EX_DIVBYZERO) {
+    divfunc(one, zero);
+    uint32_t status_word = FEnv::get_status_word();
+    if (!(FEnv::exception_value_from_status(status_word) & FEnv::EX_DIVBYZERO))
+      result = -1;
+  }
+  if (to_raise & FEnv::EX_OVERFLOW) {
+    divfunc(large_value, small_value);
+    uint32_t status_word = FEnv::get_status_word();
+    if (!(FEnv::exception_value_from_status(status_word) & FEnv::EX_OVERFLOW))
+      result = -1;
+  }
+  if (to_raise & FEnv::EX_UNDERFLOW) {
+    divfunc(small_value, large_value);
+    uint32_t status_word = FEnv::get_status_word();
+    if (!(FEnv::exception_value_from_status(status_word) & FEnv::EX_UNDERFLOW))
+      result = -1;
+  }
+  if (to_raise & FEnv::EX_INEXACT) {
+    float two = 2.0f;
+    float three = 3.0f;
+    // 2.0 / 3.0 cannot be represented exactly in any radix 2 floating point
+    // format.
+    divfunc(two, three);
+    uint32_t status_word = FEnv::get_status_word();
+    if (!(FEnv::exception_value_from_status(status_word) & FEnv::EX_INEXACT))
+      result = -1;
+  }
+  if (to_raise & FEnv::EX_FLUSHTOZERO) {
+    // TODO: raise the flush to zero floating point exception.
+    result = -1;
+  }
+  return result;
+}
+
+LIBC_INLINE int get_round() {
+  uint32_t rounding_mode =
+      (FEnv::get_control_word() >> FEnv::ROUNDING_CONTROL_BIT_POSITION) & 0x3;
+  switch (rounding_mode) {
+  case FEnv::TONEAREST:
+    return FE_TONEAREST;
+  case FEnv::DOWNWARD:
+    return FE_DOWNWARD;
+  case FEnv::UPWARD:
+    return FE_UPWARD;
+  case FEnv::TOWARDZERO:
+    return FE_TOWARDZERO;
+  default:
+    return -1; // Error value.
+  }
+}
+
+LIBC_INLINE int set_round(int mode) {
+  uint32_t bit_value;
+  switch (mode) {
+  case FE_TONEAREST:
+    bit_value = FEnv::TONEAREST;
+    break;
+  case FE_DOWNWARD:
+    bit_value = FEnv::DOWNWARD;
+    break;
+  case FE_UPWARD:
+    bit_value = FEnv::UPWARD;
+    break;
+  case FE_TOWARDZERO:
+    bit_value = FEnv::TOWARDZERO;
+    break;
+  default:
+    return 1; // To indicate failure
+  }
+
+  uint32_t control_word = FEnv::get_control_word();
+  control_word &= ~(0x3u << FEnv::ROUNDING_CONTROL_BIT_POSITION);
+  control_word |= (bit_value << FEnv::ROUNDING_CONTROL_BIT_POSITION);
+  FEnv::set_control_word(control_word);
+
+  return 0;
+}
+
+LIBC_INLINE int get_env(fenv_t *envp) {
+  FEnv::FPState *state = reinterpret_cast<FEnv::FPState *>(envp);
+  state->ControlWord = FEnv::get_control_word();
+  state->StatusWord = FEnv::get_status_word();
+  return 0;
+}
+
+LIBC_INLINE int set_env(const fenv_t *envp) {
+  if (envp == FE_DFL_ENV) {
+    // Default status and control words bits are all zeros so we just
+    // write zeros.
+    FEnv::set_status_word(0);
+    FEnv::set_control_word(0);
+    return 0;
+  }
+  const FEnv::FPState *state = reinterpret_cast<const FEnv::FPState *>(envp);
+  FEnv::set_control_word(static_cast<uint32_t>(state->ControlWord));
+  FEnv::set_status_word(static_cast<uint32_t>(state->StatusWord));
+  return 0;
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_AARCH64_FENV_DARWIN_IMPL_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/aarch64/nearest_integer.h b/contrib/llvm-project/libc/src/__support/FPUtil/aarch64/nearest_integer.h
new file mode 100644
index 000000000000..d5ea0678825f
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/aarch64/nearest_integer.h
@@ -0,0 +1,38 @@
+//===--- Round floating point to nearest integer on aarch64 -----*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_AARCH64_NEAREST_INTEGER_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_AARCH64_NEAREST_INTEGER_H
+
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+
+#if !defined(LIBC_TARGET_ARCH_IS_AARCH64)
+#error "Invalid include"
+#endif
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+LIBC_INLINE float nearest_integer(float x) {
+  float result;
+  __asm__ __volatile__("frintn %s0, %s1\n\t" : "=w"(result) : "w"(x));
+  return result;
+}
+
+LIBC_INLINE double nearest_integer(double x) {
+  double result;
+  __asm__ __volatile__("frintn %d0, %d1\n\t" : "=w"(result) : "w"(x));
+  return result;
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_AARCH64_NEAREST_INTEGER_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/aarch64/sqrt.h b/contrib/llvm-project/libc/src/__support/FPUtil/aarch64/sqrt.h
new file mode 100644
index 000000000000..4eb576bf2244
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/aarch64/sqrt.h
@@ -0,0 +1,45 @@
+//===-- Square root of IEEE 754 floating point numbers ----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_AARCH64_SQRT_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_AARCH64_SQRT_H
+
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+#include "src/__support/macros/properties/cpu_features.h"
+
+#if !defined(LIBC_TARGET_ARCH_IS_AARCH64)
+#error "Invalid include"
+#endif
+
+#include "src/__support/FPUtil/generic/sqrt.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+#ifdef LIBC_TARGET_CPU_HAS_FPU_FLOAT
+template <> LIBC_INLINE float sqrt<float>(float x) {
+  float y;
+  asm("fsqrt %s0, %s1\n\t" : "=w"(y) : "w"(x));
+  return y;
+}
+#endif // LIBC_TARGET_CPU_HAS_FPU_FLOAT
+
+#ifdef LIBC_TARGET_CPU_HAS_FPU_DOUBLE
+template <> LIBC_INLINE double sqrt<double>(double x) {
+  double y;
+  asm("fsqrt %d0, %d1\n\t" : "=w"(y) : "w"(x));
+  return y;
+}
+#endif // LIBC_TARGET_CPU_HAS_FPU_DOUBLE
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_AARCH64_SQRT_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/arm/FEnvImpl.h b/contrib/llvm-project/libc/src/__support/FPUtil/arm/FEnvImpl.h
new file mode 100644
index 000000000000..aaf37c0a045a
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/arm/FEnvImpl.h
@@ -0,0 +1,266 @@
+//===-- arm floating point env manipulation functions -----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_ARM_FENVIMPL_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_ARM_FENVIMPL_H
+
+#include "hdr/fenv_macros.h"
+#include "hdr/types/fenv_t.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/macros/attributes.h" // For LIBC_INLINE
+#include "src/__support/macros/config.h"
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+struct FEnv {
+  // Arm floating point state is all stored in a single 32-bit register named
+  // fpscr.
+  uint32_t fpscr;
+  static constexpr uint32_t RoundingControlBitPosition = 22;
+  static constexpr uint32_t ExceptionControlBitPosition = 8;
+
+  static constexpr uint32_t TONEAREST = 0x0;
+  static constexpr uint32_t UPWARD = 0x1;
+  static constexpr uint32_t DOWNWARD = 0x2;
+  static constexpr uint32_t TOWARDZERO = 0x3;
+
+  static constexpr uint32_t INVALID_ENABLE = 0x1;
+  static constexpr uint32_t DIVBYZERO_ENABLE = 0x2;
+  static constexpr uint32_t OVERFLOW_ENABLE = 0x4;
+  static constexpr uint32_t UNDERFLOW_ENABLE = 0x8;
+  static constexpr uint32_t INEXACT_ENABLE = 0x10;
+  static constexpr uint32_t DENORMAL_ENABLE = 0x20;
+
+  static constexpr uint32_t INVALID_STATUS = 0x1;
+  static constexpr uint32_t DIVBYZERO_STATUS = 0x2;
+  static constexpr uint32_t OVERFLOW_STATUS = 0x4;
+  static constexpr uint32_t UNDERFLOW_STATUS = 0x8;
+  static constexpr uint32_t INEXACT_STATUS = 0x10;
+  static constexpr uint32_t DENORMAL_STATUS = 0x80;
+
+  LIBC_INLINE static uint32_t get_fpscr() { return __builtin_arm_get_fpscr(); }
+  LIBC_INLINE static void set_fpscr(uint32_t val) {
+    __builtin_arm_set_fpscr(val);
+  }
+
+  LIBC_INLINE static int exception_enable_bits_to_macro(uint32_t status) {
+    return ((status & INVALID_ENABLE) ? FE_INVALID : 0) |
+           ((status & DIVBYZERO_ENABLE) ? FE_DIVBYZERO : 0) |
+           ((status & OVERFLOW_ENABLE) ? FE_OVERFLOW : 0) |
+           ((status & UNDERFLOW_ENABLE) ? FE_UNDERFLOW : 0) |
+           ((status & INEXACT_ENABLE) ? FE_INEXACT : 0);
+  }
+
+  LIBC_INLINE static uint32_t exception_macro_to_enable_bits(int except) {
+    return ((except & FE_INVALID) ? INVALID_ENABLE : 0) |
+           ((except & FE_DIVBYZERO) ? DIVBYZERO_ENABLE : 0) |
+           ((except & FE_OVERFLOW) ? OVERFLOW_ENABLE : 0) |
+           ((except & FE_UNDERFLOW) ? UNDERFLOW_ENABLE : 0) |
+           ((except & FE_INEXACT) ? INEXACT_ENABLE : 0);
+  }
+
+  LIBC_INLINE static uint32_t exception_macro_to_status_bits(int except) {
+    return ((except & FE_INVALID) ? INVALID_STATUS : 0) |
+           ((except & FE_DIVBYZERO) ? DIVBYZERO_STATUS : 0) |
+           ((except & FE_OVERFLOW) ? OVERFLOW_STATUS : 0) |
+           ((except & FE_UNDERFLOW) ? UNDERFLOW_STATUS : 0) |
+           ((except & FE_INEXACT) ? INEXACT_STATUS : 0);
+  }
+
+  LIBC_INLINE static uint32_t exception_status_bits_to_macro(int status) {
+    return ((status & INVALID_STATUS) ? FE_INVALID : 0) |
+           ((status & DIVBYZERO_STATUS) ? FE_DIVBYZERO : 0) |
+           ((status & OVERFLOW_STATUS) ? FE_OVERFLOW : 0) |
+           ((status & UNDERFLOW_STATUS) ? FE_UNDERFLOW : 0) |
+           ((status & INEXACT_STATUS) ? FE_INEXACT : 0);
+  }
+};
+
+// Enables exceptions in |excepts| and returns the previously set exceptions.
+LIBC_INLINE int enable_except(int excepts) {
+  uint32_t new_excepts = FEnv::exception_macro_to_enable_bits(excepts);
+  uint32_t fpscr = FEnv::get_fpscr();
+  int old = (fpscr >> FEnv::ExceptionControlBitPosition) & 0x3F;
+  fpscr |= (new_excepts << FEnv::ExceptionControlBitPosition);
+  FEnv::set_fpscr(fpscr);
+  return FEnv::exception_enable_bits_to_macro(old);
+}
+
+// Disables exceptions in |excepts| and returns the previously set exceptions.
+LIBC_INLINE int disable_except(int excepts) {
+  uint32_t disable_bits = FEnv::exception_macro_to_enable_bits(excepts);
+  uint32_t fpscr = FEnv::get_fpscr();
+  int old = (fpscr >> FEnv::ExceptionControlBitPosition) & 0x3F;
+  fpscr &= ~(disable_bits << FEnv::ExceptionControlBitPosition);
+  FEnv::set_fpscr(fpscr);
+  return FEnv::exception_enable_bits_to_macro(old);
+}
+
+// Returns the currently enabled exceptions.
+LIBC_INLINE int get_except() {
+  uint32_t fpscr = FEnv::get_fpscr();
+  int enabled_excepts = (fpscr >> FEnv::ExceptionControlBitPosition) & 0x3F;
+  return FEnv::exception_enable_bits_to_macro(enabled_excepts);
+}
+
+// Clears the exceptions in |excepts|.
+LIBC_INLINE int clear_except(int excepts) {
+  uint32_t fpscr = FEnv::get_fpscr();
+  uint32_t to_clear = FEnv::exception_macro_to_status_bits(excepts);
+  fpscr &= ~to_clear;
+  FEnv::set_fpscr(fpscr);
+  return 0;
+}
+
+// Returns the set of exceptions which are from the input set |excepts|.
+LIBC_INLINE int test_except(int excepts) {
+  uint32_t to_test = FEnv::exception_macro_to_status_bits(excepts);
+  uint32_t fpscr = FEnv::get_fpscr();
+  return FEnv::exception_status_bits_to_macro(fpscr & 0x9F & to_test);
+}
+
+// Set the exceptions in |excepts|.
+LIBC_INLINE int set_except(int excepts) {
+  uint32_t fpscr = FEnv::get_fpscr();
+  FEnv::set_fpscr(fpscr | FEnv::exception_macro_to_status_bits(excepts));
+  return 0;
+}
+
+LIBC_INLINE int raise_except(int excepts) {
+  float zero = 0.0f;
+  float one = 1.0f;
+  float large_value = FPBits<float>::max_normal().get_val();
+  float small_value = FPBits<float>::min_normal().get_val();
+  auto divfunc = [](float a, float b) {
+    __asm__ __volatile__("flds  s0, %0\n\t"
+                         "flds  s1, %1\n\t"
+                         "fdivs s0, s0, s1\n\t"
+                         : // No outputs
+                         : "m"(a), "m"(b)
+                         : "s0", "s1" /* s0 and s1 are clobbered */);
+  };
+
+  uint32_t to_raise = FEnv::exception_macro_to_status_bits(excepts);
+  int result = 0;
+
+  if (to_raise & FEnv::INVALID_STATUS) {
+    divfunc(zero, zero);
+    uint32_t fpscr = FEnv::get_fpscr();
+    if (!(fpscr & FEnv::INVALID_STATUS))
+      result = -1;
+  }
+  if (to_raise & FEnv::DIVBYZERO_STATUS) {
+    divfunc(one, zero);
+    uint32_t fpscr = FEnv::get_fpscr();
+    if (!(fpscr & FEnv::DIVBYZERO_STATUS))
+      result = -1;
+  }
+  if (to_raise & FEnv::OVERFLOW_STATUS) {
+    divfunc(large_value, small_value);
+    uint32_t fpscr = FEnv::get_fpscr();
+    if (!(fpscr & FEnv::OVERFLOW_STATUS))
+      result = -1;
+  }
+  if (to_raise & FEnv::UNDERFLOW_STATUS) {
+    divfunc(small_value, large_value);
+    uint32_t fpscr = FEnv::get_fpscr();
+    if (!(fpscr & FEnv::UNDERFLOW_STATUS))
+      result = -1;
+  }
+  if (to_raise & FEnv::INEXACT_STATUS) {
+    float two = 2.0f;
+    float three = 3.0f;
+    // 2.0 / 3.0 cannot be represented exactly in any radix 2 floating point
+    // format.
+    divfunc(two, three);
+    uint32_t fpscr = FEnv::get_fpscr();
+    if (!(fpscr & FEnv::INEXACT_STATUS))
+      result = -1;
+  }
+  return result;
+}
+
+LIBC_INLINE int get_round() {
+  uint32_t mode = (FEnv::get_fpscr() >> FEnv::RoundingControlBitPosition) & 0x3;
+  switch (mode) {
+  case FEnv::TONEAREST:
+    return FE_TONEAREST;
+  case FEnv::DOWNWARD:
+    return FE_DOWNWARD;
+  case FEnv::UPWARD:
+    return FE_UPWARD;
+  case FEnv::TOWARDZERO:
+    return FE_TOWARDZERO;
+  default:
+    return -1; // Error value.
+  }
+  return 0;
+}
+
+LIBC_INLINE int set_round(int mode) {
+  uint16_t bits;
+  switch (mode) {
+  case FE_TONEAREST:
+    bits = FEnv::TONEAREST;
+    break;
+  case FE_DOWNWARD:
+    bits = FEnv::DOWNWARD;
+    break;
+  case FE_UPWARD:
+    bits = FEnv::UPWARD;
+    break;
+  case FE_TOWARDZERO:
+    bits = FEnv::TOWARDZERO;
+    break;
+  default:
+    return 1; // To indicate failure
+  }
+
+  uint32_t fpscr = FEnv::get_fpscr();
+  fpscr &= ~(0x3 << FEnv::RoundingControlBitPosition);
+  fpscr |= (bits << FEnv::RoundingControlBitPosition);
+  FEnv::set_fpscr(fpscr);
+
+  return 0;
+}
+
+LIBC_INLINE int get_env(fenv_t *envp) {
+  FEnv *state = reinterpret_cast<FEnv *>(envp);
+  state->fpscr = FEnv::get_fpscr();
+  return 0;
+}
+
+LIBC_INLINE int set_env(const fenv_t *envp) {
+  if (envp == FE_DFL_ENV) {
+    uint32_t fpscr = FEnv::get_fpscr();
+    // Default status implies:
+    // 1. Round to nearest rounding mode.
+    fpscr &= ~(0x3 << FEnv::RoundingControlBitPosition);
+    fpscr |= (FEnv::TONEAREST << FEnv::RoundingControlBitPosition);
+    // 2. All exceptions are disabled.
+    fpscr &= ~(0x3F << FEnv::ExceptionControlBitPosition);
+    // 3. All exceptions are cleared. There are two reserved bits
+    // at bit 5 and 6 so we just write one full byte (6 bits for
+    // the exceptions, and 2 reserved bits.)
+    fpscr &= ~(static_cast<uint32_t>(0xFF));
+
+    FEnv::set_fpscr(fpscr);
+    return 0;
+  }
+
+  const FEnv *state = reinterpret_cast<const FEnv *>(envp);
+  FEnv::set_fpscr(state->fpscr);
+  return 0;
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_ARM_FENVIMPL_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/arm/sqrt.h b/contrib/llvm-project/libc/src/__support/FPUtil/arm/sqrt.h
new file mode 100644
index 000000000000..e6cb58c0be81
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/arm/sqrt.h
@@ -0,0 +1,45 @@
+//===-- Square root of IEEE 754 floating point numbers ----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_ARM_SQRT_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_ARM_SQRT_H
+
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+#include "src/__support/macros/properties/cpu_features.h"
+
+#if !defined(LIBC_TARGET_ARCH_IS_ARM)
+#error "Invalid include"
+#endif
+
+#include "src/__support/FPUtil/generic/sqrt.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+#ifdef LIBC_TARGET_CPU_HAS_FPU_FLOAT
+template <> LIBC_INLINE float sqrt<float>(float x) {
+  float y;
+  asm("vsqrt %0, %1\n\t" : "=w"(y) : "w"(x));
+  return y;
+}
+#endif // LIBC_TARGET_CPU_HAS_FPU_FLOAT
+
+#ifdef LIBC_TARGET_CPU_HAS_FPU_DOUBLE
+template <> LIBC_INLINE double sqrt<double>(double x) {
+  double y;
+  asm("vsqrt %0, %1\n\t" : "=w"(y) : "w"(x));
+  return y;
+}
+#endif // LIBC_TARGET_CPU_HAS_FPU_DOUBLE
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_ARM_SQRT_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/bfloat16.h b/contrib/llvm-project/libc/src/__support/FPUtil/bfloat16.h
new file mode 100644
index 000000000000..bc0b8b23896f
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/bfloat16.h
@@ -0,0 +1,65 @@
+//===-- Definition of bfloat16 data type. -----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_BFLOAT16_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_BFLOAT16_H
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/FPUtil/cast.h"
+#include "src/__support/FPUtil/dyadic_float.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h"
+
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+struct BFloat16 {
+  uint16_t bits;
+
+  LIBC_INLINE BFloat16() = default;
+
+  LIBC_INLINE constexpr explicit BFloat16(uint16_t bits) : bits(bits) {}
+
+  template <typename T> LIBC_INLINE constexpr explicit BFloat16(T value) {
+    if constexpr (cpp::is_floating_point_v<T>) {
+      bits = fputil::cast<bfloat16>(value).bits;
+    } else if constexpr (cpp::is_integral_v<T>) {
+      Sign sign = Sign::POS;
+
+      if constexpr (cpp::is_signed_v<T>) {
+        if (value < 0) {
+          sign = Sign::NEG;
+          value = -value;
+        }
+      }
+
+      fputil::DyadicFloat<cpp::numeric_limits<cpp::make_unsigned_t<T>>::digits>
+          xd(sign, 0, value);
+      bits = xd.template as<bfloat16, /*ShouldSignalExceptions=*/true>().bits;
+
+    } else {
+      bits = fputil::cast<bfloat16>(static_cast<float>(value)).bits;
+    }
+  }
+
+  template <cpp::enable_if_t<fputil::get_fp_type<float>() ==
+                                 fputil::FPType::IEEE754_Binary32,
+                             int> = 0>
+  LIBC_INLINE constexpr operator float() const {
+    uint32_t x_bits = static_cast<uint32_t>(bits) << 16U;
+    return cpp::bit_cast<float>(x_bits);
+  }
+}; // struct BFloat16
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_BFLOAT16_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/cast.h b/contrib/llvm-project/libc/src/__support/FPUtil/cast.h
new file mode 100644
index 000000000000..e6fad1be7d05
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/cast.h
@@ -0,0 +1,76 @@
+//===-- Conversion between floating-point types -----------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_CAST_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_CAST_H
+
+#include "FPBits.h"
+#include "dyadic_float.h"
+#include "hdr/fenv_macros.h"
+#include "src/__support/CPP/algorithm.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE::fputil {
+
+// TODO: Add optimization for known good targets with fast
+// float to float16 conversion:
+// https://github.com/llvm/llvm-project/issues/133517
+template <typename OutType, typename InType>
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_floating_point_v<OutType> &&
+                                           cpp::is_floating_point_v<InType>,
+                                       OutType>
+cast(InType x) {
+  // Casting to the same type is a no-op.
+  if constexpr (cpp::is_same_v<InType, OutType>)
+    return x;
+
+  // bfloat16 is always defined (for now)
+  if constexpr (cpp::is_same_v<OutType, bfloat16> ||
+                cpp::is_same_v<InType, bfloat16>
+#if defined(LIBC_TYPES_HAS_FLOAT16) && !defined(__LIBC_USE_FLOAT16_CONVERSION)
+                || cpp::is_same_v<OutType, float16> ||
+                cpp::is_same_v<InType, float16>
+#endif
+  ) {
+    using InFPBits = FPBits<InType>;
+    using InStorageType = typename InFPBits::StorageType;
+    using OutFPBits = FPBits<OutType>;
+    using OutStorageType = typename OutFPBits::StorageType;
+
+    InFPBits x_bits(x);
+
+    if (x_bits.is_nan()) {
+      if (x_bits.is_signaling_nan()) {
+        raise_except_if_required(FE_INVALID);
+        return OutFPBits::quiet_nan().get_val();
+      }
+
+      InStorageType x_mant = x_bits.get_mantissa();
+      if (InFPBits::FRACTION_LEN > OutFPBits::FRACTION_LEN)
+        x_mant >>= InFPBits::FRACTION_LEN - OutFPBits::FRACTION_LEN;
+      return OutFPBits::quiet_nan(x_bits.sign(),
+                                  static_cast<OutStorageType>(x_mant))
+          .get_val();
+    }
+
+    if (x_bits.is_inf())
+      return OutFPBits::inf(x_bits.sign()).get_val();
+
+    constexpr size_t MAX_FRACTION_LEN =
+        cpp::max(OutFPBits::FRACTION_LEN, InFPBits::FRACTION_LEN);
+    DyadicFloat<cpp::bit_ceil(MAX_FRACTION_LEN)> xd(x);
+    return xd.template as<OutType, /*ShouldSignalExceptions=*/true>();
+  }
+
+  return static_cast<OutType>(x);
+}
+
+} // namespace LIBC_NAMESPACE::fputil
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_CAST_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/double_double.h b/contrib/llvm-project/libc/src/__support/FPUtil/double_double.h
new file mode 100644
index 000000000000..c27885aadc02
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/double_double.h
@@ -0,0 +1,211 @@
+//===-- Utilities for double-double data type. ------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_DOUBLE_DOUBLE_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_DOUBLE_DOUBLE_H
+
+#include "multiply_add.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/cpu_features.h" // LIBC_TARGET_CPU_HAS_FMA
+#include "src/__support/number_pair.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+template <typename T> struct DefaultSplit;
+template <> struct DefaultSplit<float> {
+  static constexpr size_t VALUE = 12;
+};
+template <> struct DefaultSplit<double> {
+  static constexpr size_t VALUE = 27;
+};
+
+using DoubleDouble = NumberPair<double>;
+using FloatFloat = NumberPair<float>;
+
+// The output of Dekker's FastTwoSum algorithm is correct, i.e.:
+//   r.hi + r.lo = a + b exactly
+//   and |r.lo| < eps(r.lo)
+// Assumption: |a| >= |b|, or a = 0.
+template <bool FAST2SUM = true, typename T = double>
+LIBC_INLINE constexpr NumberPair<T> exact_add(T a, T b) {
+  NumberPair<T> r{0.0, 0.0};
+  if constexpr (FAST2SUM) {
+    r.hi = a + b;
+    T t = r.hi - a;
+    r.lo = b - t;
+  } else {
+    r.hi = a + b;
+    T t1 = r.hi - a;
+    T t2 = r.hi - t1;
+    T t3 = b - t1;
+    T t4 = a - t2;
+    r.lo = t3 + t4;
+  }
+  return r;
+}
+
+// Assumption: |a.hi| >= |b.hi|
+template <typename T>
+LIBC_INLINE constexpr NumberPair<T> add(const NumberPair<T> &a,
+                                        const NumberPair<T> &b) {
+  NumberPair<T> r = exact_add(a.hi, b.hi);
+  T lo = a.lo + b.lo;
+  return exact_add(r.hi, r.lo + lo);
+}
+
+// Assumption: |a.hi| >= |b|
+template <typename T>
+LIBC_INLINE constexpr NumberPair<T> add(const NumberPair<T> &a, T b) {
+  NumberPair<T> r = exact_add<false>(a.hi, b);
+  return exact_add(r.hi, r.lo + a.lo);
+}
+
+// Veltkamp's Splitting for double precision.
+// Note: This is proved to be correct for all rounding modes:
+//   Zimmermann, P., "Note on the Veltkamp/Dekker Algorithms with Directed
+//   Roundings," https://inria.hal.science/hal-04480440.
+// Default splitting constant = 2^ceil(prec(double)/2) + 1 = 2^27 + 1.
+template <typename T = double, size_t N = DefaultSplit<T>::VALUE>
+LIBC_INLINE constexpr NumberPair<T> split(T a) {
+  NumberPair<T> r{0.0, 0.0};
+  // CN = 2^N.
+  constexpr T CN = static_cast<T>(1 << N);
+  constexpr T C = CN + 1.0;
+  double t1 = C * a;
+  double t2 = a - t1;
+  r.hi = t1 + t2;
+  r.lo = a - r.hi;
+  return r;
+}
+
+// Helper for non-fma exact mult where the first number is already split.
+template <typename T = double, size_t SPLIT_B = DefaultSplit<T>::VALUE>
+LIBC_INLINE NumberPair<T> exact_mult(const NumberPair<T> &as, T a, T b) {
+  NumberPair<T> bs = split<T, SPLIT_B>(b);
+  NumberPair<T> r{0.0, 0.0};
+
+  r.hi = a * b;
+  T t1 = as.hi * bs.hi - r.hi;
+  T t2 = as.hi * bs.lo + t1;
+  T t3 = as.lo * bs.hi + t2;
+  r.lo = as.lo * bs.lo + t3;
+
+  return r;
+}
+
+// The templated exact multiplication needs template version of
+// LIBC_TARGET_CPU_HAS_FMA_* macro to correctly select the implementation.
+// These can be moved to "src/__support/macros/properties/cpu_features.h" if
+// other part of libc needed.
+template <typename T> struct TargetHasFmaInstruction {
+  static constexpr bool VALUE = false;
+};
+
+#ifdef LIBC_TARGET_CPU_HAS_FMA_FLOAT
+template <> struct TargetHasFmaInstruction<float> {
+  static constexpr bool VALUE = true;
+};
+#endif // LIBC_TARGET_CPU_HAS_FMA_FLOAT
+
+#ifdef LIBC_TARGET_CPU_HAS_FMA_DOUBLE
+template <> struct TargetHasFmaInstruction<double> {
+  static constexpr bool VALUE = true;
+};
+#endif // LIBC_TARGET_CPU_HAS_FMA_DOUBLE
+
+// Note: When FMA instruction is not available, the `exact_mult` function is
+// only correct for round-to-nearest mode.  See:
+//   Zimmermann, P., "Note on the Veltkamp/Dekker Algorithms with Directed
+//   Roundings," https://inria.hal.science/hal-04480440.
+// Using Theorem 1 in the paper above, without FMA instruction, if we restrict
+// the generated constants to precision <= 51, and splitting it by 2^28 + 1,
+// then a * b = r.hi + r.lo is exact for all rounding modes.
+template <typename T = double, size_t SPLIT_B = DefaultSplit<T>::VALUE>
+LIBC_INLINE NumberPair<T> exact_mult(T a, T b) {
+  NumberPair<T> r{0.0, 0.0};
+
+  if constexpr (TargetHasFmaInstruction<T>::VALUE) {
+    r.hi = a * b;
+    r.lo = fputil::multiply_add(a, b, -r.hi);
+  } else {
+    // Dekker's Product.
+    NumberPair<T> as = split(a);
+
+    r = exact_mult<T, SPLIT_B>(as, a, b);
+  }
+
+  return r;
+}
+
+LIBC_INLINE DoubleDouble quick_mult(double a, const DoubleDouble &b) {
+  DoubleDouble r = exact_mult(a, b.hi);
+  r.lo = multiply_add(a, b.lo, r.lo);
+  return r;
+}
+
+template <size_t SPLIT_B = 27>
+LIBC_INLINE DoubleDouble quick_mult(const DoubleDouble &a,
+                                    const DoubleDouble &b) {
+  DoubleDouble r = exact_mult<double, SPLIT_B>(a.hi, b.hi);
+  double t1 = multiply_add(a.hi, b.lo, r.lo);
+  double t2 = multiply_add(a.lo, b.hi, t1);
+  r.lo = t2;
+  return r;
+}
+
+// Assuming |c| >= |a * b|.
+template <>
+LIBC_INLINE DoubleDouble multiply_add<DoubleDouble>(const DoubleDouble &a,
+                                                    const DoubleDouble &b,
+                                                    const DoubleDouble &c) {
+  return add(c, quick_mult(a, b));
+}
+
+// Accurate double-double division, following Karp-Markstein's trick for
+// division, implemented in the CORE-MATH project at:
+// https://gitlab.inria.fr/core-math/core-math/-/blob/master/src/binary64/tan/tan.c#L1855
+//
+// Error bounds:
+// Let a = ah + al, b = bh + bl.
+// Let r = rh + rl be the approximation of (ah + al) / (bh + bl).
+// Then:
+//   (ah + al) / (bh + bl) - rh =
+// = ((ah - bh * rh) + (al - bl * rh)) / (bh + bl)
+// = (1 + O(bl/bh)) * ((ah - bh * rh) + (al - bl * rh)) / bh
+// Let q = round(1/bh), then the above expressions are approximately:
+// = (1 + O(bl / bh)) * (1 + O(2^-52)) * q * ((ah - bh * rh) + (al - bl * rh))
+// So we can compute:
+//   rl = q * (ah - bh * rh) + q * (al - bl * rh)
+// as accurate as possible, then the error is bounded by:
+//   |(ah + al) / (bh + bl) - (rh + rl)| < O(bl/bh) * (2^-52 + al/ah + bl/bh)
+template <typename T>
+LIBC_INLINE NumberPair<T> div(const NumberPair<T> &a, const NumberPair<T> &b) {
+  NumberPair<T> r;
+  T q = T(1) / b.hi;
+  r.hi = a.hi * q;
+
+#ifdef LIBC_TARGET_CPU_HAS_FMA
+  T e_hi = fputil::multiply_add(b.hi, -r.hi, a.hi);
+  T e_lo = fputil::multiply_add(b.lo, -r.hi, a.lo);
+#else
+  NumberPair<T> b_hi_r_hi = fputil::exact_mult(b.hi, -r.hi);
+  NumberPair<T> b_lo_r_hi = fputil::exact_mult(b.lo, -r.hi);
+  T e_hi = (a.hi + b_hi_r_hi.hi) + b_hi_r_hi.lo;
+  T e_lo = (a.lo + b_lo_r_hi.hi) + b_lo_r_hi.lo;
+#endif // LIBC_TARGET_CPU_HAS_FMA
+
+  r.lo = q * (e_hi + e_lo);
+  return r;
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_DOUBLE_DOUBLE_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/dyadic_float.h b/contrib/llvm-project/libc/src/__support/FPUtil/dyadic_float.h
new file mode 100644
index 000000000000..3464e4aa9423
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/dyadic_float.h
@@ -0,0 +1,714 @@
+//===-- A class to store high precision floating point numbers --*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_DYADIC_FLOAT_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_DYADIC_FLOAT_H
+
+#include "FEnvImpl.h"
+#include "FPBits.h"
+#include "hdr/errno_macros.h"
+#include "hdr/fenv_macros.h"
+#include "multiply_add.h"
+#include "rounding_mode.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/big_int.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
+#include "src/__support/macros/properties/types.h"
+
+#include <stddef.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+// Decide whether to round a UInt up, down or not at all at a given bit
+// position, based on the current rounding mode. The assumption is that the
+// caller is going to make the integer `value >> rshift`, and then might need
+// to round it up by 1 depending on the value of the bits shifted off the
+// bottom.
+//
+// `logical_sign` causes the behavior of FE_DOWNWARD and FE_UPWARD to
+// be reversed, which is what you'd want if this is the mantissa of a
+// negative floating-point number.
+//
+// Return value is +1 if the value should be rounded up; -1 if it should be
+// rounded down; 0 if it's exact and needs no rounding.
+template <size_t Bits>
+LIBC_INLINE constexpr int
+rounding_direction(const LIBC_NAMESPACE::UInt<Bits> &value, size_t rshift,
+                   Sign logical_sign) {
+  if (rshift == 0 || (rshift < Bits && (value << (Bits - rshift)) == 0) ||
+      (rshift >= Bits && value == 0))
+    return 0; // exact
+
+  switch (quick_get_round()) {
+  case FE_TONEAREST:
+    if (rshift > 0 && rshift <= Bits && value.get_bit(rshift - 1)) {
+      // We round up, unless the value is an exact halfway case and
+      // the bit that will end up in the units place is 0, in which
+      // case tie-break-to-even says round down.
+      bool round_bit = rshift < Bits ? value.get_bit(rshift) : 0;
+      return round_bit != 0 || (value << (Bits - rshift + 1)) != 0 ? +1 : -1;
+    } else {
+      return -1;
+    }
+  case FE_TOWARDZERO:
+    return -1;
+  case FE_DOWNWARD:
+    return logical_sign.is_neg() &&
+                   (rshift < Bits && (value << (Bits - rshift)) != 0)
+               ? +1
+               : -1;
+  case FE_UPWARD:
+    return logical_sign.is_pos() &&
+                   (rshift < Bits && (value << (Bits - rshift)) != 0)
+               ? +1
+               : -1;
+  default:
+    __builtin_unreachable();
+  }
+}
+
+// A generic class to perform computations of high precision floating points.
+// We store the value in dyadic format, including 3 fields:
+//   sign    : boolean value - false means positive, true means negative
+//   exponent: the exponent value of the least significant bit of the mantissa.
+//   mantissa: unsigned integer of length `Bits`.
+// So the real value that is stored is:
+//   real value = (-1)^sign * 2^exponent * (mantissa as unsigned integer)
+// The stored data is normal if for non-zero mantissa, the leading bit is 1.
+// The outputs of the constructors and most functions will be normalized.
+// To simplify and improve the efficiency, many functions will assume that the
+// inputs are normal.
+template <size_t Bits> struct DyadicFloat {
+  using MantissaType = LIBC_NAMESPACE::UInt<Bits>;
+
+  Sign sign = Sign::POS;
+  int exponent = 0;
+  MantissaType mantissa = MantissaType(0);
+
+  LIBC_INLINE constexpr DyadicFloat() = default;
+
+  template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+  LIBC_INLINE constexpr DyadicFloat(T x) {
+    static_assert(FPBits<T>::FRACTION_LEN < Bits);
+    FPBits<T> x_bits(x);
+    sign = x_bits.sign();
+    exponent = x_bits.get_explicit_exponent() - FPBits<T>::FRACTION_LEN;
+    mantissa = MantissaType(x_bits.get_explicit_mantissa());
+    normalize();
+  }
+
+  LIBC_INLINE constexpr DyadicFloat(Sign s, int e, const MantissaType &m)
+      : sign(s), exponent(e), mantissa(m) {
+    normalize();
+  }
+
+  // Normalizing the mantissa, bringing the leading 1 bit to the most
+  // significant bit.
+  LIBC_INLINE constexpr DyadicFloat &normalize() {
+    if (!mantissa.is_zero()) {
+      int shift_length = cpp::countl_zero(mantissa);
+      exponent -= shift_length;
+      mantissa <<= static_cast<size_t>(shift_length);
+    }
+    return *this;
+  }
+
+  // Used for aligning exponents.  Output might not be normalized.
+  LIBC_INLINE constexpr DyadicFloat &shift_left(unsigned shift_length) {
+    if (shift_length < Bits) {
+      exponent -= static_cast<int>(shift_length);
+      mantissa <<= shift_length;
+    } else {
+      exponent = 0;
+      mantissa = MantissaType(0);
+    }
+    return *this;
+  }
+
+  // Used for aligning exponents.  Output might not be normalized.
+  LIBC_INLINE constexpr DyadicFloat &shift_right(unsigned shift_length) {
+    if (shift_length < Bits) {
+      exponent += static_cast<int>(shift_length);
+      mantissa >>= shift_length;
+    } else {
+      exponent = 0;
+      mantissa = MantissaType(0);
+    }
+    return *this;
+  }
+
+  // Assume that it is already normalized.  Output the unbiased exponent.
+  LIBC_INLINE constexpr int get_unbiased_exponent() const {
+    return exponent + (Bits - 1);
+  }
+
+  // Produce a correctly rounded DyadicFloat from a too-large mantissa,
+  // by shifting it down and rounding if necessary.
+  template <size_t MantissaBits>
+  LIBC_INLINE constexpr static DyadicFloat<Bits>
+  round(Sign result_sign, int result_exponent,
+        const LIBC_NAMESPACE::UInt<MantissaBits> &input_mantissa,
+        size_t rshift) {
+    MantissaType result_mantissa(input_mantissa >> rshift);
+    if (rounding_direction(input_mantissa, rshift, result_sign) > 0) {
+      ++result_mantissa;
+      if (result_mantissa == 0) {
+        // Rounding up made the mantissa integer wrap round to 0,
+        // carrying a bit off the top. So we've rounded up to the next
+        // exponent.
+        result_mantissa.set_bit(Bits - 1);
+        ++result_exponent;
+      }
+    }
+    return DyadicFloat(result_sign, result_exponent, result_mantissa);
+  }
+
+  template <typename T, bool ShouldSignalExceptions>
+  LIBC_INLINE constexpr cpp::enable_if_t<
+      cpp::is_floating_point_v<T> && (FPBits<T>::FRACTION_LEN < Bits), T>
+  generic_as() const {
+    using FPBits = FPBits<T>;
+    using StorageType = typename FPBits::StorageType;
+
+    constexpr int EXTRA_FRACTION_LEN = Bits - 1 - FPBits::FRACTION_LEN;
+
+    if (mantissa == 0)
+      return FPBits::zero(sign).get_val();
+
+    int unbiased_exp = get_unbiased_exponent();
+
+    if (unbiased_exp + FPBits::EXP_BIAS >= FPBits::MAX_BIASED_EXPONENT) {
+      if constexpr (ShouldSignalExceptions) {
+        set_errno_if_required(ERANGE);
+        raise_except_if_required(FE_OVERFLOW | FE_INEXACT);
+      }
+
+      switch (quick_get_round()) {
+      case FE_TONEAREST:
+        return FPBits::inf(sign).get_val();
+      case FE_TOWARDZERO:
+        return FPBits::max_normal(sign).get_val();
+      case FE_DOWNWARD:
+        if (sign.is_pos())
+          return FPBits::max_normal(Sign::POS).get_val();
+        return FPBits::inf(Sign::NEG).get_val();
+      case FE_UPWARD:
+        if (sign.is_neg())
+          return FPBits::max_normal(Sign::NEG).get_val();
+        return FPBits::inf(Sign::POS).get_val();
+      default:
+        __builtin_unreachable();
+      }
+    }
+
+    StorageType out_biased_exp = 0;
+    StorageType out_mantissa = 0;
+    bool round = false;
+    bool sticky = false;
+    bool underflow = false;
+
+    if (unbiased_exp < -FPBits::EXP_BIAS - FPBits::FRACTION_LEN) {
+      sticky = true;
+      underflow = true;
+    } else if (unbiased_exp == -FPBits::EXP_BIAS - FPBits::FRACTION_LEN) {
+      round = true;
+      MantissaType sticky_mask = (MantissaType(1) << (Bits - 1)) - 1;
+      sticky = (mantissa & sticky_mask) != 0;
+    } else {
+      int extra_fraction_len = EXTRA_FRACTION_LEN;
+
+      if (unbiased_exp < 1 - FPBits::EXP_BIAS) {
+        underflow = true;
+        extra_fraction_len += 1 - FPBits::EXP_BIAS - unbiased_exp;
+      } else {
+        out_biased_exp =
+            static_cast<StorageType>(unbiased_exp + FPBits::EXP_BIAS);
+      }
+
+      MantissaType round_mask = MantissaType(1) << (extra_fraction_len - 1);
+      round = (mantissa & round_mask) != 0;
+      MantissaType sticky_mask = round_mask - 1;
+      sticky = (mantissa & sticky_mask) != 0;
+
+      out_mantissa = static_cast<StorageType>(mantissa >> extra_fraction_len);
+    }
+
+    bool lsb = (out_mantissa & 1) != 0;
+
+    StorageType result =
+        FPBits::create_value(sign, out_biased_exp, out_mantissa).uintval();
+
+    switch (quick_get_round()) {
+    case FE_TONEAREST:
+      if (round && (lsb || sticky))
+        ++result;
+      break;
+    case FE_DOWNWARD:
+      if (sign.is_neg() && (round || sticky))
+        ++result;
+      break;
+    case FE_UPWARD:
+      if (sign.is_pos() && (round || sticky))
+        ++result;
+      break;
+    default:
+      break;
+    }
+
+    if (ShouldSignalExceptions && (round || sticky)) {
+      int excepts = FE_INEXACT;
+      if (FPBits(result).is_inf()) {
+        set_errno_if_required(ERANGE);
+        excepts |= FE_OVERFLOW;
+      } else if (underflow) {
+        set_errno_if_required(ERANGE);
+        excepts |= FE_UNDERFLOW;
+      }
+      raise_except_if_required(excepts);
+    }
+
+    return FPBits(result).get_val();
+  }
+
+  template <typename T, bool ShouldSignalExceptions,
+            typename = cpp::enable_if_t<cpp::is_floating_point_v<T> &&
+                                            (FPBits<T>::FRACTION_LEN < Bits),
+                                        void>>
+  LIBC_INLINE constexpr T fast_as() const {
+    if (LIBC_UNLIKELY(mantissa.is_zero()))
+      return FPBits<T>::zero(sign).get_val();
+
+    // Assume that it is normalized, and output is also normal.
+    constexpr uint32_t PRECISION = FPBits<T>::FRACTION_LEN + 1;
+    using output_bits_t = typename FPBits<T>::StorageType;
+    constexpr output_bits_t IMPLICIT_MASK =
+        FPBits<T>::SIG_MASK - FPBits<T>::FRACTION_MASK;
+
+    int exp_hi = exponent + static_cast<int>((Bits - 1) + FPBits<T>::EXP_BIAS);
+
+    if (LIBC_UNLIKELY(exp_hi > 2 * FPBits<T>::EXP_BIAS)) {
+      // Results overflow.
+      T d_hi =
+          FPBits<T>::create_value(sign, 2 * FPBits<T>::EXP_BIAS, IMPLICIT_MASK)
+              .get_val();
+      // volatile prevents constant propagation that would result in infinity
+      // always being returned no matter the current rounding mode.
+      volatile T two = static_cast<T>(2.0);
+      T r = two * d_hi;
+
+      // TODO: Whether rounding down the absolute value to max_normal should
+      // also raise FE_OVERFLOW and set ERANGE is debatable.
+      if (ShouldSignalExceptions && FPBits<T>(r).is_inf())
+        set_errno_if_required(ERANGE);
+
+      return r;
+    }
+
+    bool denorm = false;
+    uint32_t shift = Bits - PRECISION;
+    if (LIBC_UNLIKELY(exp_hi <= 0)) {
+      // Output is denormal.
+      denorm = true;
+      shift = (Bits - PRECISION) + static_cast<uint32_t>(1 - exp_hi);
+
+      exp_hi = FPBits<T>::EXP_BIAS;
+    }
+
+    int exp_lo = exp_hi - static_cast<int>(PRECISION) - 1;
+
+    MantissaType m_hi =
+        shift >= MantissaType::BITS ? MantissaType(0) : mantissa >> shift;
+
+    T d_hi = FPBits<T>::create_value(
+                 sign, static_cast<output_bits_t>(exp_hi),
+                 (static_cast<output_bits_t>(m_hi) & FPBits<T>::SIG_MASK) |
+                     IMPLICIT_MASK)
+                 .get_val();
+
+    MantissaType round_mask =
+        shift - 1 >= MantissaType::BITS ? 0 : MantissaType(1) << (shift - 1);
+    MantissaType sticky_mask = round_mask - MantissaType(1);
+
+    bool round_bit = !(mantissa & round_mask).is_zero();
+    bool sticky_bit = !(mantissa & sticky_mask).is_zero();
+    int round_and_sticky = int(round_bit) * 2 + int(sticky_bit);
+
+    T d_lo;
+
+    if (LIBC_UNLIKELY(exp_lo <= 0)) {
+      // d_lo is denormal, but the output is normal.
+      int scale_up_exponent = 1 - exp_lo;
+      T scale_up_factor =
+          FPBits<T>::create_value(Sign::POS,
+                                  static_cast<output_bits_t>(
+                                      FPBits<T>::EXP_BIAS + scale_up_exponent),
+                                  IMPLICIT_MASK)
+              .get_val();
+      T scale_down_factor =
+          FPBits<T>::create_value(Sign::POS,
+                                  static_cast<output_bits_t>(
+                                      FPBits<T>::EXP_BIAS - scale_up_exponent),
+                                  IMPLICIT_MASK)
+              .get_val();
+
+      d_lo = FPBits<T>::create_value(
+                 sign, static_cast<output_bits_t>(exp_lo + scale_up_exponent),
+                 IMPLICIT_MASK)
+                 .get_val();
+
+      return multiply_add(d_lo, T(round_and_sticky), d_hi * scale_up_factor) *
+             scale_down_factor;
+    }
+
+    d_lo = FPBits<T>::create_value(sign, static_cast<output_bits_t>(exp_lo),
+                                   IMPLICIT_MASK)
+               .get_val();
+
+    // Still correct without FMA instructions if `d_lo` is not underflow.
+    T r = multiply_add(d_lo, T(round_and_sticky), d_hi);
+
+    if (LIBC_UNLIKELY(denorm)) {
+      // Exponent before rounding is in denormal range, simply clear the
+      // exponent field.
+      output_bits_t clear_exp = static_cast<output_bits_t>(
+          output_bits_t(exp_hi) << FPBits<T>::SIG_LEN);
+      output_bits_t r_bits = FPBits<T>(r).uintval() - clear_exp;
+
+      if (!(r_bits & FPBits<T>::EXP_MASK)) {
+        // Output is denormal after rounding, clear the implicit bit for 80-bit
+        // long double.
+        r_bits -= IMPLICIT_MASK;
+
+        // TODO: IEEE Std 754-2019 lets implementers choose whether to check for
+        // "tininess" before or after rounding for base-2 formats, as long as
+        // the same choice is made for all operations. Our choice to check after
+        // rounding might not be the same as the hardware's.
+        if (ShouldSignalExceptions && round_and_sticky) {
+          set_errno_if_required(ERANGE);
+          raise_except_if_required(FE_UNDERFLOW);
+        }
+      }
+
+      return FPBits<T>(r_bits).get_val();
+    }
+
+    return r;
+  }
+
+  // Assume that it is already normalized.
+  // Output is rounded correctly with respect to the current rounding mode.
+  template <typename T, bool ShouldSignalExceptions,
+            typename = cpp::enable_if_t<cpp::is_floating_point_v<T> &&
+                                            (FPBits<T>::FRACTION_LEN < Bits),
+                                        void>>
+  LIBC_INLINE constexpr T as() const {
+    if constexpr (cpp::is_same_v<T, bfloat16>
+#if defined(LIBC_TYPES_HAS_FLOAT16) && !defined(__LIBC_USE_FLOAT16_CONVERSION)
+                  || cpp::is_same_v<T, float16>
+#endif
+    )
+      return generic_as<T, ShouldSignalExceptions>();
+    else
+      return fast_as<T, ShouldSignalExceptions>();
+  }
+
+  template <typename T,
+            typename = cpp::enable_if_t<cpp::is_floating_point_v<T> &&
+                                            (FPBits<T>::FRACTION_LEN < Bits),
+                                        void>>
+  LIBC_INLINE explicit constexpr operator T() const {
+    return as<T, /*ShouldSignalExceptions=*/false>();
+  }
+
+  LIBC_INLINE constexpr MantissaType as_mantissa_type() const {
+    if (mantissa.is_zero())
+      return 0;
+
+    MantissaType new_mant = mantissa;
+    if (exponent > 0) {
+      new_mant <<= exponent;
+    } else {
+      // Cast the exponent to size_t before negating it, rather than after,
+      // to avoid undefined behavior negating INT_MIN as an integer (although
+      // exponents coming in to this function _shouldn't_ be that large). The
+      // result should always end up as a positive size_t.
+      size_t shift = -static_cast<size_t>(exponent);
+      new_mant >>= shift;
+    }
+
+    if (sign.is_neg()) {
+      new_mant = (~new_mant) + 1;
+    }
+
+    return new_mant;
+  }
+
+  LIBC_INLINE constexpr MantissaType
+  as_mantissa_type_rounded(int *round_dir_out = nullptr) const {
+    int round_dir = 0;
+    MantissaType new_mant;
+    if (mantissa.is_zero()) {
+      new_mant = 0;
+    } else {
+      new_mant = mantissa;
+      if (exponent > 0) {
+        new_mant <<= exponent;
+      } else if (exponent < 0) {
+        // Cast the exponent to size_t before negating it, rather than after,
+        // to avoid undefined behavior negating INT_MIN as an integer (although
+        // exponents coming in to this function _shouldn't_ be that large). The
+        // result should always end up as a positive size_t.
+        size_t shift = -static_cast<size_t>(exponent);
+        if (shift >= Bits)
+          new_mant = 0;
+        else
+          new_mant >>= shift;
+        round_dir = rounding_direction(mantissa, shift, sign);
+        if (round_dir > 0)
+          ++new_mant;
+      }
+
+      if (sign.is_neg()) {
+        new_mant = (~new_mant) + 1;
+      }
+    }
+
+    if (round_dir_out)
+      *round_dir_out = round_dir;
+
+    return new_mant;
+  }
+
+  LIBC_INLINE constexpr DyadicFloat operator-() const {
+    return DyadicFloat(sign.negate(), exponent, mantissa);
+  }
+};
+
+// Quick add - Add 2 dyadic floats with rounding toward 0 and then normalize the
+// output:
+//   - Align the exponents so that:
+//     new a.exponent = new b.exponent = max(a.exponent, b.exponent)
+//   - Add or subtract the mantissas depending on the signs.
+//   - Normalize the result.
+// The absolute errors compared to the mathematical sum is bounded by:
+//   | quick_add(a, b) - (a + b) | < MSB(a + b) * 2^(-Bits + 2),
+// i.e., errors are up to 2 ULPs.
+// Assume inputs are normalized (by constructors or other functions) so that we
+// don't need to normalize the inputs again in this function.  If the inputs are
+// not normalized, the results might lose precision significantly.
+template <size_t Bits>
+LIBC_INLINE constexpr DyadicFloat<Bits> quick_add(DyadicFloat<Bits> a,
+                                                  DyadicFloat<Bits> b) {
+  if (LIBC_UNLIKELY(a.mantissa.is_zero()))
+    return b;
+  if (LIBC_UNLIKELY(b.mantissa.is_zero()))
+    return a;
+
+  // Align exponents
+  if (a.exponent > b.exponent)
+    b.shift_right(static_cast<unsigned>(a.exponent - b.exponent));
+  else if (b.exponent > a.exponent)
+    a.shift_right(static_cast<unsigned>(b.exponent - a.exponent));
+
+  DyadicFloat<Bits> result;
+
+  if (a.sign == b.sign) {
+    // Addition
+    result.sign = a.sign;
+    result.exponent = a.exponent;
+    result.mantissa = a.mantissa;
+    if (result.mantissa.add_overflow(b.mantissa)) {
+      // Mantissa addition overflow.
+      result.shift_right(1);
+      result.mantissa.val[DyadicFloat<Bits>::MantissaType::WORD_COUNT - 1] |=
+          (uint64_t(1) << 63);
+    }
+    // Result is already normalized.
+    return result;
+  }
+
+  // Subtraction
+  if (a.mantissa >= b.mantissa) {
+    result.sign = a.sign;
+    result.exponent = a.exponent;
+    result.mantissa = a.mantissa - b.mantissa;
+  } else {
+    result.sign = b.sign;
+    result.exponent = b.exponent;
+    result.mantissa = b.mantissa - a.mantissa;
+  }
+
+  return result.normalize();
+}
+
+template <size_t Bits>
+LIBC_INLINE constexpr DyadicFloat<Bits> quick_sub(DyadicFloat<Bits> a,
+                                                  DyadicFloat<Bits> b) {
+  return quick_add(a, -b);
+}
+
+// Quick Mul - Slightly less accurate but efficient multiplication of 2 dyadic
+// floats with rounding toward 0 and then normalize the output:
+//   result.exponent = a.exponent + b.exponent + Bits,
+//   result.mantissa = quick_mul_hi(a.mantissa + b.mantissa)
+//                   ~ (full product a.mantissa * b.mantissa) >> Bits.
+// The errors compared to the mathematical product is bounded by:
+//   2 * errors of quick_mul_hi = 2 * (UInt<Bits>::WORD_COUNT - 1) in ULPs.
+// Assume inputs are normalized (by constructors or other functions) so that we
+// don't need to normalize the inputs again in this function.  If the inputs are
+// not normalized, the results might lose precision significantly.
+template <size_t Bits>
+LIBC_INLINE constexpr DyadicFloat<Bits> quick_mul(const DyadicFloat<Bits> &a,
+                                                  const DyadicFloat<Bits> &b) {
+  DyadicFloat<Bits> result;
+  result.sign = (a.sign != b.sign) ? Sign::NEG : Sign::POS;
+  result.exponent = a.exponent + b.exponent + static_cast<int>(Bits);
+
+  if (!(a.mantissa.is_zero() || b.mantissa.is_zero())) {
+    result.mantissa = a.mantissa.quick_mul_hi(b.mantissa);
+    // Check the leading bit directly, should be faster than using clz in
+    // normalize().
+    if (result.mantissa.val[DyadicFloat<Bits>::MantissaType::WORD_COUNT - 1] >>
+            63 ==
+        0)
+      result.shift_left(1);
+  } else {
+    result.mantissa = (typename DyadicFloat<Bits>::MantissaType)(0);
+  }
+  return result;
+}
+
+// Correctly rounded multiplication of 2 dyadic floats, assuming the
+// exponent remains within range.
+template <size_t Bits>
+LIBC_INLINE constexpr DyadicFloat<Bits>
+rounded_mul(const DyadicFloat<Bits> &a, const DyadicFloat<Bits> &b) {
+  using DblMant = LIBC_NAMESPACE::UInt<(2 * Bits)>;
+  Sign result_sign = (a.sign != b.sign) ? Sign::NEG : Sign::POS;
+  int result_exponent = a.exponent + b.exponent + static_cast<int>(Bits);
+  auto product = DblMant(a.mantissa) * DblMant(b.mantissa);
+  // As in quick_mul(), renormalize by 1 bit manually rather than countl_zero
+  if (product.get_bit(2 * Bits - 1) == 0) {
+    product <<= 1;
+    result_exponent -= 1;
+  }
+
+  return DyadicFloat<Bits>::round(result_sign, result_exponent, product, Bits);
+}
+
+// Approximate reciprocal - given a nonzero a, make a good approximation to 1/a.
+// The method is Newton-Raphson iteration, based on quick_mul.
+template <size_t Bits, typename = cpp::enable_if_t<(Bits >= 32)>>
+LIBC_INLINE constexpr DyadicFloat<Bits>
+approx_reciprocal(const DyadicFloat<Bits> &a) {
+  // Given an approximation x to 1/a, a better one is x' = x(2-ax).
+  //
+  // You can derive this by using the Newton-Raphson formula with the function
+  // f(x) = 1/x - a. But another way to see that it works is to say: suppose
+  // that ax = 1-e for some small error e. Then ax' = ax(2-ax) = (1-e)(1+e) =
+  // 1-e^2. So the error in x' is the square of the error in x, i.e. the number
+  // of correct bits in x' is double the number in x.
+
+  // An initial approximation to the reciprocal
+  DyadicFloat<Bits> x(Sign::POS, -32 - a.exponent - int(Bits),
+                      uint64_t(0xFFFFFFFFFFFFFFFF) /
+                          static_cast<uint64_t>(a.mantissa >> (Bits - 32)));
+
+  // The constant 2, which we'll need in every iteration
+  DyadicFloat<Bits> two(Sign::POS, 1, 1);
+
+  // We expect at least 31 correct bits from our 32-bit starting approximation
+  size_t ok_bits = 31;
+
+  // The number of good bits doubles in each iteration, except that rounding
+  // errors introduce a little extra each time. Subtract a bit from our
+  // accuracy assessment to account for that.
+  while (ok_bits < Bits) {
+    x = quick_mul(x, quick_sub(two, quick_mul(a, x)));
+    ok_bits = 2 * ok_bits - 1;
+  }
+
+  return x;
+}
+
+// Correctly rounded division of 2 dyadic floats, assuming the
+// exponent remains within range.
+template <size_t Bits>
+LIBC_INLINE constexpr DyadicFloat<Bits>
+rounded_div(const DyadicFloat<Bits> &af, const DyadicFloat<Bits> &bf) {
+  using DblMant = LIBC_NAMESPACE::UInt<(Bits * 2 + 64)>;
+
+  // Make an approximation to the quotient as a * (1/b). Both the
+  // multiplication and the reciprocal are a bit sloppy, which doesn't
+  // matter, because we're going to correct for that below.
+  auto qf = fputil::quick_mul(af, fputil::approx_reciprocal(bf));
+
+  // Switch to BigInt and stop using quick_add and quick_mul: now
+  // we're working in exact integers so as to get the true remainder.
+  DblMant a = af.mantissa, b = bf.mantissa, q = qf.mantissa;
+  q <<= 2; // leave room for a round bit, even if exponent decreases
+  a <<= af.exponent - bf.exponent - qf.exponent + 2;
+  DblMant qb = q * b;
+  if (qb < a) {
+    DblMant too_small = a - b;
+    while (qb <= too_small) {
+      qb += b;
+      ++q;
+    }
+  } else {
+    while (qb > a) {
+      qb -= b;
+      --q;
+    }
+  }
+
+  DyadicFloat<(Bits * 2)> qbig(qf.sign, qf.exponent - 2, q);
+  return DyadicFloat<Bits>::round(qbig.sign, qbig.exponent + Bits,
+                                  qbig.mantissa, Bits);
+}
+
+// Simple polynomial approximation.
+template <size_t Bits>
+LIBC_INLINE constexpr DyadicFloat<Bits>
+multiply_add(const DyadicFloat<Bits> &a, const DyadicFloat<Bits> &b,
+             const DyadicFloat<Bits> &c) {
+  return quick_add(c, quick_mul(a, b));
+}
+
+// Simple exponentiation implementation for printf. Only handles positive
+// exponents, since division isn't implemented.
+template <size_t Bits>
+LIBC_INLINE constexpr DyadicFloat<Bits> pow_n(const DyadicFloat<Bits> &a,
+                                              uint32_t power) {
+  DyadicFloat<Bits> result = 1.0;
+  DyadicFloat<Bits> cur_power = a;
+
+  while (power > 0) {
+    if ((power % 2) > 0) {
+      result = quick_mul(result, cur_power);
+    }
+    power = power >> 1;
+    cur_power = quick_mul(cur_power, cur_power);
+  }
+  return result;
+}
+
+template <size_t Bits>
+LIBC_INLINE constexpr DyadicFloat<Bits> mul_pow_2(const DyadicFloat<Bits> &a,
+                                                  int32_t pow_2) {
+  DyadicFloat<Bits> result = a;
+  result.exponent += pow_2;
+  return result;
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_DYADIC_FLOAT_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/except_value_utils.h b/contrib/llvm-project/libc/src/__support/FPUtil/except_value_utils.h
new file mode 100644
index 000000000000..5f767769974d
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/except_value_utils.h
@@ -0,0 +1,145 @@
+//===-- Common header for helpers to set exceptional values -----*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_EXCEPT_VALUE_UTILS_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_EXCEPT_VALUE_UTILS_H
+
+#include "FEnvImpl.h"
+#include "FPBits.h"
+#include "cast.h"
+#include "rounding_mode.h"
+#include "src/__support/CPP/optional.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
+#include "src/__support/macros/properties/cpu_features.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace fputil {
+
+// This file contains utility functions and classes to manage exceptional values
+// when there are many of them.
+//
+// Example usage:
+//
+// Define list of exceptional inputs and outputs:
+//   static constexpr int N = ...;  // Number of exceptional values.
+//   static constexpr fputil::ExceptValues<StorageType, N> Excepts {
+//     <list of input bits, output bits and offsets>
+//   };
+//
+// Check for exceptional inputs:
+//   if (auto r = Excepts.lookup(x_bits); LIBC_UNLIKELY(r.has_value()))
+//     return r.value();
+
+template <typename T, size_t N> struct ExceptValues {
+  static_assert(cpp::is_floating_point_v<T>, "Must be a floating point type.");
+
+  using StorageType = typename FPBits<T>::StorageType;
+
+  struct Mapping {
+    StorageType input;
+    StorageType rnd_towardzero_result;
+    StorageType rnd_upward_offset;
+    StorageType rnd_downward_offset;
+    StorageType rnd_tonearest_offset;
+  };
+
+  Mapping values[N];
+
+  LIBC_INLINE constexpr cpp::optional<T> lookup(StorageType x_bits) const {
+    for (size_t i = 0; i < N; ++i) {
+      if (LIBC_UNLIKELY(x_bits == values[i].input)) {
+        StorageType out_bits = values[i].rnd_towardzero_result;
+        switch (fputil::quick_get_round()) {
+        case FE_UPWARD:
+          out_bits += values[i].rnd_upward_offset;
+          break;
+        case FE_DOWNWARD:
+          out_bits += values[i].rnd_downward_offset;
+          break;
+        case FE_TONEAREST:
+          out_bits += values[i].rnd_tonearest_offset;
+          break;
+        }
+        return FPBits<T>(out_bits).get_val();
+      }
+    }
+    return cpp::nullopt;
+  }
+
+  LIBC_INLINE constexpr cpp::optional<T> lookup_odd(StorageType x_abs,
+                                                    bool sign) const {
+    for (size_t i = 0; i < N; ++i) {
+      if (LIBC_UNLIKELY(x_abs == values[i].input)) {
+        StorageType out_bits = values[i].rnd_towardzero_result;
+        switch (fputil::quick_get_round()) {
+        case FE_UPWARD:
+          if (sign)
+            out_bits += values[i].rnd_downward_offset;
+          else
+            out_bits += values[i].rnd_upward_offset;
+          break;
+        case FE_DOWNWARD:
+          // Use conditionals instead of ternary operator to work around gcc's
+          // -Wconversion false positive bug:
+          // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101537
+          if (sign)
+            out_bits += values[i].rnd_upward_offset;
+          else
+            out_bits += values[i].rnd_downward_offset;
+          break;
+        case FE_TONEAREST:
+          out_bits += values[i].rnd_tonearest_offset;
+          break;
+        }
+        T result = FPBits<T>(out_bits).get_val();
+        if (sign)
+          result = -result;
+
+        return result;
+      }
+    }
+    return cpp::nullopt;
+  }
+};
+
+// Helper functions to set results for exceptional cases.
+template <typename T> LIBC_INLINE T round_result_slightly_down(T value_rn) {
+  volatile T tmp = value_rn;
+  tmp -= FPBits<T>::min_normal().get_val();
+  return tmp;
+}
+
+template <typename T> LIBC_INLINE T round_result_slightly_up(T value_rn) {
+  volatile T tmp = value_rn;
+  tmp += FPBits<T>::min_normal().get_val();
+  return tmp;
+}
+
+#if defined(LIBC_TYPES_HAS_FLOAT16) &&                                         \
+    !defined(LIBC_TARGET_CPU_HAS_FAST_FLOAT16_OPS)
+template <> LIBC_INLINE float16 round_result_slightly_down(float16 value_rn) {
+  volatile float tmp = value_rn;
+  tmp -= FPBits<float16>::min_normal().get_val();
+  return cast<float16>(tmp);
+}
+
+template <> LIBC_INLINE float16 round_result_slightly_up(float16 value_rn) {
+  volatile float tmp = value_rn;
+  tmp += FPBits<float16>::min_normal().get_val();
+  return cast<float16>(tmp);
+}
+#endif
+
+} // namespace fputil
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_EXCEPT_VALUE_UTILS_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/fpbits_str.h b/contrib/llvm-project/libc/src/__support/FPUtil/fpbits_str.h
new file mode 100644
index 000000000000..92981917561a
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/fpbits_str.h
@@ -0,0 +1,76 @@
+//===------ Pretty print function for FPBits --------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_FPBITS_STR_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_FPBITS_STR_H
+
+#include "src/__support/CPP/string.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/integer_to_string.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace details {
+
+// Format T as uppercase hexadecimal number with leading zeros.
+template <typename T>
+using ZeroPaddedHexFmt = IntegerToString<
+    T, typename radix::Hex::WithWidth<(sizeof(T) * 2)>::WithPrefix::Uppercase>;
+
+} // namespace details
+
+// Converts the bits to a string in the following format:
+//    "0x<NNN...N> = S: N, E: 0xNNNN, M:0xNNN...N"
+// 1. N is a hexadecimal digit.
+// 2. The hexadecimal number on the LHS is the raw numerical representation
+//    of the bits.
+// 3. The exponent is always 16 bits wide irrespective of the type of the
+//    floating encoding.
+template <typename T> LIBC_INLINE cpp::string str(fputil::FPBits<T> x) {
+  using StorageType = typename fputil::FPBits<T>::StorageType;
+
+  if (x.is_nan())
+    return "(NaN)";
+  if (x.is_inf())
+    return x.is_neg() ? "(-Infinity)" : "(+Infinity)";
+
+  const auto sign_char = [](Sign sign) -> char {
+    return sign.is_neg() ? '1' : '0';
+  };
+
+  cpp::string s;
+
+  const details::ZeroPaddedHexFmt<StorageType> bits(x.uintval());
+  s += bits.view();
+
+  s += " = (S: ";
+  s += sign_char(x.sign());
+
+  s += ", E: ";
+  const details::ZeroPaddedHexFmt<uint16_t> exponent(x.get_biased_exponent());
+  s += exponent.view();
+
+  if constexpr (fputil::get_fp_type<T>() == fputil::FPType::X86_Binary80) {
+    s += ", I: ";
+    s += sign_char(x.get_implicit_bit() ? Sign::NEG : Sign::POS);
+  }
+
+  s += ", M: ";
+  const details::ZeroPaddedHexFmt<StorageType> mantissa(x.get_mantissa());
+  s += mantissa.view();
+
+  s += ')';
+  return s;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_FPBITS_STR_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/generic/FMA.h b/contrib/llvm-project/libc/src/__support/FPUtil/generic/FMA.h
new file mode 100644
index 000000000000..bec312e44b1b
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/generic/FMA.h
@@ -0,0 +1,288 @@
+//===-- Common header for FMA implementations -------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_FMA_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_FMA_H
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/CPP/limits.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/FPUtil/BasicOperations.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/FPUtil/cast.h"
+#include "src/__support/FPUtil/dyadic_float.h"
+#include "src/__support/FPUtil/rounding_mode.h"
+#include "src/__support/big_int.h"
+#include "src/__support/macros/attributes.h"   // LIBC_INLINE
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
+
+#include "hdr/fenv_macros.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+namespace generic {
+
+template <typename OutType, typename InType>
+LIBC_INLINE cpp::enable_if_t<cpp::is_floating_point_v<OutType> &&
+                                 cpp::is_floating_point_v<InType> &&
+                                 sizeof(OutType) <= sizeof(InType),
+                             OutType>
+fma(InType x, InType y, InType z);
+
+// TODO(lntue): Implement fmaf that is correctly rounded to all rounding modes.
+// The implementation below only is only correct for the default rounding mode,
+// round-to-nearest tie-to-even.
+template <> LIBC_INLINE float fma<float>(float x, float y, float z) {
+  // Product is exact.
+  double prod = static_cast<double>(x) * static_cast<double>(y);
+  double z_d = static_cast<double>(z);
+  double sum = prod + z_d;
+  fputil::FPBits<double> bit_prod(prod), bitz(z_d), bit_sum(sum);
+
+  if (!(bit_sum.is_inf_or_nan() || bit_sum.is_zero())) {
+    // Since the sum is computed in double precision, rounding might happen
+    // (for instance, when bitz.exponent > bit_prod.exponent + 5, or
+    // bit_prod.exponent > bitz.exponent + 40).  In that case, when we round
+    // the sum back to float, double rounding error might occur.
+    // A concrete example of this phenomenon is as follows:
+    //   x = y = 1 + 2^(-12), z = 2^(-53)
+    // The exact value of x*y + z is 1 + 2^(-11) + 2^(-24) + 2^(-53)
+    // So when rounding to float, fmaf(x, y, z) = 1 + 2^(-11) + 2^(-23)
+    // On the other hand, with the default rounding mode,
+    //   double(x*y + z) = 1 + 2^(-11) + 2^(-24)
+    // and casting again to float gives us:
+    //   float(double(x*y + z)) = 1 + 2^(-11).
+    //
+    // In order to correct this possible double rounding error, first we use
+    // Dekker's 2Sum algorithm to find t such that sum - t = prod + z exactly,
+    // assuming the (default) rounding mode is round-to-the-nearest,
+    // tie-to-even.  Moreover, t satisfies the condition that t < eps(sum),
+    // i.e., t.exponent < sum.exponent - 52. So if t is not 0, meaning rounding
+    // occurs when computing the sum, we just need to use t to adjust (any) last
+    // bit of sum, so that the sticky bits used when rounding sum to float are
+    // correct (when it matters).
+    fputil::FPBits<double> t(
+        (bit_prod.get_biased_exponent() >= bitz.get_biased_exponent())
+            ? ((bit_sum.get_val() - bit_prod.get_val()) - bitz.get_val())
+            : ((bit_sum.get_val() - bitz.get_val()) - bit_prod.get_val()));
+
+    // Update sticky bits if t != 0.0 and the least (52 - 23 - 1 = 28) bits are
+    // zero.
+    if (!t.is_zero() && ((bit_sum.get_mantissa() & 0xfff'ffffULL) == 0)) {
+      if (bit_sum.sign() != t.sign())
+        bit_sum.set_mantissa(bit_sum.get_mantissa() + 1);
+      else if (bit_sum.get_mantissa())
+        bit_sum.set_mantissa(bit_sum.get_mantissa() - 1);
+    }
+  }
+
+  return static_cast<float>(bit_sum.get_val());
+}
+
+namespace internal {
+
+// Extract the sticky bits and shift the `mantissa` to the right by
+// `shift_length`.
+template <typename T>
+LIBC_INLINE cpp::enable_if_t<is_unsigned_integral_or_big_int_v<T>, bool>
+shift_mantissa(int shift_length, T &mant) {
+  if (shift_length >= cpp::numeric_limits<T>::digits) {
+    mant = 0;
+    return true; // prod_mant is non-zero.
+  }
+  T mask = (T(1) << shift_length) - 1;
+  bool sticky_bits = (mant & mask) != 0;
+  mant >>= shift_length;
+  return sticky_bits;
+}
+
+} // namespace internal
+
+template <typename OutType, typename InType>
+LIBC_INLINE cpp::enable_if_t<cpp::is_floating_point_v<OutType> &&
+                                 cpp::is_floating_point_v<InType> &&
+                                 sizeof(OutType) <= sizeof(InType),
+                             OutType>
+fma(InType x, InType y, InType z) {
+  using OutFPBits = FPBits<OutType>;
+  using OutStorageType = typename OutFPBits::StorageType;
+  using InFPBits = FPBits<InType>;
+  using InStorageType = typename InFPBits::StorageType;
+
+  constexpr int IN_EXPLICIT_MANT_LEN = InFPBits::FRACTION_LEN + 1;
+  constexpr size_t PROD_LEN = 2 * IN_EXPLICIT_MANT_LEN;
+  constexpr size_t TMP_RESULT_LEN = cpp::bit_ceil(PROD_LEN + 1);
+  using TmpResultType = UInt<TMP_RESULT_LEN>;
+  using DyadicFloat = DyadicFloat<TMP_RESULT_LEN>;
+
+  InFPBits x_bits(x), y_bits(y), z_bits(z);
+
+  if (LIBC_UNLIKELY(x_bits.is_nan() || y_bits.is_nan() || z_bits.is_nan())) {
+    if (x_bits.is_nan() || y_bits.is_nan()) {
+      if (x_bits.is_signaling_nan() || y_bits.is_signaling_nan() ||
+          z_bits.is_signaling_nan())
+        raise_except_if_required(FE_INVALID);
+
+      if (x_bits.is_quiet_nan()) {
+        InStorageType x_payload = x_bits.get_mantissa();
+        x_payload >>= InFPBits::FRACTION_LEN - OutFPBits::FRACTION_LEN;
+        return OutFPBits::quiet_nan(x_bits.sign(),
+                                    static_cast<OutStorageType>(x_payload))
+            .get_val();
+      }
+
+      if (y_bits.is_quiet_nan()) {
+        InStorageType y_payload = y_bits.get_mantissa();
+        y_payload >>= InFPBits::FRACTION_LEN - OutFPBits::FRACTION_LEN;
+        return OutFPBits::quiet_nan(y_bits.sign(),
+                                    static_cast<OutStorageType>(y_payload))
+            .get_val();
+      }
+
+      if (z_bits.is_quiet_nan()) {
+        InStorageType z_payload = z_bits.get_mantissa();
+        z_payload >>= InFPBits::FRACTION_LEN - OutFPBits::FRACTION_LEN;
+        return OutFPBits::quiet_nan(z_bits.sign(),
+                                    static_cast<OutStorageType>(z_payload))
+            .get_val();
+      }
+
+      return OutFPBits::quiet_nan().get_val();
+    }
+  }
+
+  if (LIBC_UNLIKELY(x == 0 || y == 0 || z == 0))
+    return cast<OutType>(x * y + z);
+
+  int x_exp = 0;
+  int y_exp = 0;
+  int z_exp = 0;
+
+  // Denormal scaling = 2^(fraction length).
+  constexpr InStorageType IMPLICIT_MASK =
+      InFPBits::SIG_MASK - InFPBits::FRACTION_MASK;
+
+  constexpr InType DENORMAL_SCALING =
+      InFPBits::create_value(
+          Sign::POS, InFPBits::FRACTION_LEN + InFPBits::EXP_BIAS, IMPLICIT_MASK)
+          .get_val();
+
+  // Normalize denormal inputs.
+  if (LIBC_UNLIKELY(InFPBits(x).is_subnormal())) {
+    x_exp -= InFPBits::FRACTION_LEN;
+    x *= DENORMAL_SCALING;
+  }
+  if (LIBC_UNLIKELY(InFPBits(y).is_subnormal())) {
+    y_exp -= InFPBits::FRACTION_LEN;
+    y *= DENORMAL_SCALING;
+  }
+  if (LIBC_UNLIKELY(InFPBits(z).is_subnormal())) {
+    z_exp -= InFPBits::FRACTION_LEN;
+    z *= DENORMAL_SCALING;
+  }
+
+  x_bits = InFPBits(x);
+  y_bits = InFPBits(y);
+  z_bits = InFPBits(z);
+  const Sign z_sign = z_bits.sign();
+  Sign prod_sign = (x_bits.sign() == y_bits.sign()) ? Sign::POS : Sign::NEG;
+  x_exp += x_bits.get_biased_exponent();
+  y_exp += y_bits.get_biased_exponent();
+  z_exp += z_bits.get_biased_exponent();
+
+  if (LIBC_UNLIKELY(x_exp == InFPBits::MAX_BIASED_EXPONENT ||
+                    y_exp == InFPBits::MAX_BIASED_EXPONENT ||
+                    z_exp == InFPBits::MAX_BIASED_EXPONENT))
+    return cast<OutType>(x * y + z);
+
+  // Extract mantissa and append hidden leading bits.
+  InStorageType x_mant = x_bits.get_explicit_mantissa();
+  InStorageType y_mant = y_bits.get_explicit_mantissa();
+  TmpResultType z_mant = z_bits.get_explicit_mantissa();
+
+  // If the exponent of the product x*y > the exponent of z, then no extra
+  // precision beside the entire product x*y is needed.  On the other hand, when
+  // the exponent of z >= the exponent of the product x*y, the worst-case that
+  // we need extra precision is when there is cancellation and the most
+  // significant bit of the product is aligned exactly with the second most
+  // significant bit of z:
+  //      z :    10aa...a
+  // - prod :     1bb...bb....b
+  // In that case, in order to store the exact result, we need at least
+  //     (Length of prod) - (Fraction length of z)
+  //   = 2*(Length of input explicit mantissa) - (Fraction length of z) bits.
+  // Overall, before aligning the mantissas and exponents, we can simply left-
+  // shift the mantissa of z by that amount.  After that, it is enough to align
+  // the least significant bit, given that we keep track of the round and sticky
+  // bits after the least significant bit.
+
+  TmpResultType prod_mant = TmpResultType(x_mant) * y_mant;
+  int prod_lsb_exp =
+      x_exp + y_exp - (InFPBits::EXP_BIAS + 2 * InFPBits::FRACTION_LEN);
+
+  constexpr int RESULT_MIN_LEN = PROD_LEN - InFPBits::FRACTION_LEN;
+  z_mant <<= RESULT_MIN_LEN;
+  int z_lsb_exp = z_exp - (InFPBits::FRACTION_LEN + RESULT_MIN_LEN);
+  bool sticky_bits = false;
+  bool z_shifted = false;
+
+  // Align exponents.
+  if (prod_lsb_exp < z_lsb_exp) {
+    sticky_bits = internal::shift_mantissa(z_lsb_exp - prod_lsb_exp, prod_mant);
+    prod_lsb_exp = z_lsb_exp;
+  } else if (z_lsb_exp < prod_lsb_exp) {
+    z_shifted = true;
+    sticky_bits = internal::shift_mantissa(prod_lsb_exp - z_lsb_exp, z_mant);
+  }
+
+  // Perform the addition:
+  //   (-1)^prod_sign * prod_mant + (-1)^z_sign * z_mant.
+  // The final result will be stored in prod_sign and prod_mant.
+  if (prod_sign == z_sign) {
+    // Effectively an addition.
+    prod_mant += z_mant;
+  } else {
+    // Subtraction cases.
+    if (prod_mant >= z_mant) {
+      if (z_shifted && sticky_bits) {
+        // Add 1 more to the subtrahend so that the sticky bits remain
+        // positive. This would simplify the rounding logic.
+        ++z_mant;
+      }
+      prod_mant -= z_mant;
+    } else {
+      if (!z_shifted && sticky_bits) {
+        // Add 1 more to the subtrahend so that the sticky bits remain
+        // positive. This would simplify the rounding logic.
+        ++prod_mant;
+      }
+      prod_mant = z_mant - prod_mant;
+      prod_sign = z_sign;
+    }
+  }
+
+  if (prod_mant == 0) {
+    // When there is exact cancellation, i.e., x*y == -z exactly, return -0.0 if
+    // rounding downward and +0.0 for other rounding modes.
+    if (quick_get_round() == FE_DOWNWARD)
+      prod_sign = Sign::NEG;
+    else
+      prod_sign = Sign::POS;
+  }
+
+  DyadicFloat result(prod_sign, prod_lsb_exp - InFPBits::EXP_BIAS, prod_mant);
+  result.mantissa |= static_cast<unsigned int>(sticky_bits);
+  return result.template as<OutType, /*ShouldSignalExceptions=*/true>();
+}
+
+} // namespace generic
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_FMA_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/generic/FMod.h b/contrib/llvm-project/libc/src/__support/FPUtil/generic/FMod.h
new file mode 100644
index 000000000000..30d6472085f6
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/generic/FMod.h
@@ -0,0 +1,296 @@
+//===-- Common header for fmod implementations ------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_FMOD_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_FMOD_H
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/CPP/limits.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/FPUtil/FEnvImpl.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+namespace generic {
+
+//  Objective:
+//    The  algorithm uses  integer arithmetic  (max uint64_t)  for general case.
+//    Some common  cases, like  abs(x) < abs(y)  or  abs(x) < 1000 *  abs(y) are
+//    treated specially to increase  performance.  The part of checking  special
+//    cases, numbers NaN, INF etc. treated separately.
+//
+//  Objective:
+//    1) FMod definition (https://cplusplus.com/reference/cmath/fmod/):
+//       fmod = numer - tquot * denom, where tquot is the truncated
+//       (i.e., rounded towards zero) result of: numer/denom.
+//    2) FMod with negative x and/or y can be trivially converted to fmod for
+//       positive x and y. Therefore the algorithm below works only with
+//       positive numbers.
+//    3) All positive floating point numbers can be represented as m * 2^e,
+//       where "m" is positive integer and "e" is signed.
+//    4) FMod function can be calculated in integer numbers (x > y):
+//         fmod = m_x * 2^e_x - tquot * m_y * 2^e_y
+//              = 2^e_y * (m_x * 2^(e_x - e^y) - tquot * m_y).
+//       All variables in parentheses are unsigned integers.
+//
+//  Mathematical background:
+//    Input x,y in the algorithm is represented (mathematically) like m_x*2^e_x
+//    and m_y*2^e_y. This is an ambiguous number representation. For example:
+//      m * 2^e = (2 * m) * 2^(e-1)
+//    The algorithm uses the facts that
+//      r = a % b = (a % (N * b)) % b,
+//      (a * c) % (b * c) = (a % b) * c
+//    where N is positive  integer number. a, b and c - positive. Let's  adopt
+//    the formula for representation above.
+//      a = m_x * 2^e_x, b = m_y * 2^e_y, N = 2^k
+//      r(k) = a % b = (m_x * 2^e_x) % (2^k * m_y * 2^e_y)
+//           = 2^(e_y + k) * (m_x * 2^(e_x - e_y - k) % m_y)
+//      r(k) = m_r * 2^e_r = (m_x % m_y) * 2^(m_y + k)
+//           = (2^p * (m_x % m_y) * 2^(e_y + k - p))
+//        m_r = 2^p * (m_x % m_y), e_r = m_y + k - p
+//
+//  Algorithm description:
+//  First, let write x = m_x * 2^e_x and y = m_y * 2^e_y with m_x, m_y, e_x, e_y
+//  are integers (m_x amd m_y positive).
+//  Then the naive  implementation of the fmod function with a simple
+//  for/while loop:
+//      while (e_x > e_y) {
+//        m_x *= 2; --e_x; //  m_x * 2^e_x == 2 * m_x * 2^(e_x - 1)
+//        m_x %= m_y;
+//      }
+//  On the other hand, the algorithm exploits the fact that m_x, m_y are the
+//  mantissas of floating point numbers, which use less bits than the storage
+//  integers: 24 / 32 for floats and 53 / 64 for doubles, so if in each step of
+//  the iteration, we can left shift m_x as many bits as the storage integer
+//  type can hold, the exponent reduction per step will be at least 32 - 24 = 8
+//  for floats and 64 - 53 = 11 for doubles (double example below):
+//      while (e_x > e_y) {
+//        m_x <<= 11; e_x -= 11; //  m_x * 2^e_x == 2^11 * m_x * 2^(e_x - 11)
+//        m_x %= m_y;
+//      }
+//  Some extra improvements are done:
+//    1) Shift m_y maximum to the right, which can significantly improve
+//       performance for small integer numbers (y = 3 for example).
+//       The m_x shift in the loop can be 62 instead of 11 for double.
+//    2) For some architectures with very slow division, it can be better to
+//       calculate inverse value ones, and after do multiplication in the loop.
+//    3) "likely" special cases are treated specially to improve performance.
+//
+//  Simple example:
+//  The examples below use byte for simplicity.
+//    1) Shift hy maximum to right without losing bits and increase iy value
+//       m_y = 0b00101100 e_y = 20 after shift m_y = 0b00001011 e_y = 22.
+//    2) m_x = m_x % m_y.
+//    3) Move m_x maximum to left. Note that after (m_x = m_x % m_y) CLZ in m_x
+//    is not lower than CLZ in m_y. m_x=0b00001001 e_x = 100, m_x=0b10010000,
+//       e_x = 100-4 = 96.
+//    4) Repeat (2) until e_x == e_y.
+//
+//  Complexity analysis (double):
+//    Converting x,y to (m_x,e_x),(m_y, e_y): CTZ/shift/AND/OR/if. Loop  count:
+//      (m_x - m_y) / (64 -  "length of m_y").
+//      max("length of m_y")  = 53,
+//      max(e_x - e_y)  = 2048
+//    Maximum operation is  186. For rare "unrealistic" cases.
+//
+//  Special cases (double):
+//    Supposing  that  case  where |y| > 1e-292 and |x/y|<2000  is  very  common
+//    special processing is implemented. No m_y alignment, no loop:
+//      result = (m_x * 2^(e_x - e_y)) % m_y.
+//    When x and y are both subnormal (rare case but...) the
+//      result = m_x % m_y.
+//    Simplified conversion back to double.
+
+// Exceptional cases handler according to cppreference.com
+//    https://en.cppreference.com/w/cpp/numeric/math/fmod
+// and POSIX standard described in Linux man
+//   https://man7.org/linux/man-pages/man3/fmod.3p.html
+// C standard for the function is not full, so not by default (although it can
+// be implemented in another handler.
+// Signaling NaN converted to quiet NaN with FE_INVALID exception.
+//    https://www.open-std.org/JTC1/SC22/WG14/www/docs/n1011.htm
+template <typename T> struct FModDivisionSimpleHelper {
+  LIBC_INLINE constexpr static T execute(int exp_diff, int sides_zeroes_count,
+                                         T m_x, T m_y) {
+    while (exp_diff > sides_zeroes_count) {
+      exp_diff -= sides_zeroes_count;
+      m_x <<= sides_zeroes_count;
+      m_x %= m_y;
+    }
+    m_x <<= exp_diff;
+    m_x %= m_y;
+    return m_x;
+  }
+};
+
+template <typename T> struct FModDivisionInvMultHelper {
+  LIBC_INLINE constexpr static T execute(int exp_diff, int sides_zeroes_count,
+                                         T m_x, T m_y) {
+    constexpr int LENGTH = sizeof(T) * CHAR_BIT;
+    if (exp_diff > sides_zeroes_count) {
+      T inv_hy = (cpp::numeric_limits<T>::max() / m_y);
+      while (exp_diff > sides_zeroes_count) {
+        exp_diff -= sides_zeroes_count;
+        T hd = (m_x * inv_hy) >> (LENGTH - sides_zeroes_count);
+        m_x <<= sides_zeroes_count;
+        m_x -= hd * m_y;
+        while (LIBC_UNLIKELY(m_x > m_y))
+          m_x -= m_y;
+      }
+      T hd = (m_x * inv_hy) >> (LENGTH - exp_diff);
+      m_x <<= exp_diff;
+      m_x -= hd * m_y;
+      while (LIBC_UNLIKELY(m_x > m_y))
+        m_x -= m_y;
+    } else {
+      m_x <<= exp_diff;
+      m_x %= m_y;
+    }
+    return m_x;
+  }
+};
+
+template <typename T, typename U = typename FPBits<T>::StorageType,
+          typename DivisionHelper = FModDivisionSimpleHelper<U>>
+class FMod {
+  static_assert(cpp::is_floating_point_v<T> &&
+                    is_unsigned_integral_or_big_int_v<U> &&
+                    (sizeof(U) * CHAR_BIT > FPBits<T>::FRACTION_LEN),
+                "FMod instantiated with invalid type.");
+
+private:
+  using FPB = FPBits<T>;
+  using StorageType = typename FPB::StorageType;
+
+  LIBC_INLINE static bool pre_check(T x, T y, T &out) {
+    using FPB = fputil::FPBits<T>;
+    const T quiet_nan = FPB::quiet_nan().get_val();
+    FPB sx(x), sy(y);
+    if (LIBC_LIKELY(!sy.is_zero() && !sy.is_inf_or_nan() &&
+                    !sx.is_inf_or_nan()))
+      return false;
+
+    if (sx.is_nan() || sy.is_nan()) {
+      if (sx.is_signaling_nan() || sy.is_signaling_nan())
+        fputil::raise_except_if_required(FE_INVALID);
+      out = quiet_nan;
+      return true;
+    }
+
+    if (sx.is_inf() || sy.is_zero()) {
+      fputil::raise_except_if_required(FE_INVALID);
+      fputil::set_errno_if_required(EDOM);
+      out = quiet_nan;
+      return true;
+    }
+
+    out = x;
+    return true;
+  }
+
+  LIBC_INLINE static constexpr FPB eval_internal(FPB sx, FPB sy) {
+
+    if (LIBC_LIKELY(sx.uintval() <= sy.uintval())) {
+      if (sx.uintval() < sy.uintval())
+        return sx;             // |x|<|y| return x
+      return FPB::zero();      // |x|=|y| return 0.0
+    }
+
+    int e_x = sx.get_biased_exponent();
+    int e_y = sy.get_biased_exponent();
+
+    // Most common case where |y| is "very normal" and |x/y| < 2^EXP_LEN
+    if (LIBC_LIKELY(e_y > int(FPB::FRACTION_LEN) &&
+                    e_x - e_y <= int(FPB::EXP_LEN))) {
+      StorageType m_x = sx.get_explicit_mantissa();
+      StorageType m_y = sy.get_explicit_mantissa();
+      StorageType d = (e_x == e_y)
+                          ? (m_x - m_y)
+                          : static_cast<StorageType>(m_x << (e_x - e_y)) % m_y;
+      if (d == 0)
+        return FPB::zero();
+      // iy - 1 because of "zero power" for number with power 1
+      return FPB::make_value(d, e_y - 1);
+    }
+    // Both subnormal special case.
+    if (LIBC_UNLIKELY(e_x == 0 && e_y == 0)) {
+      FPB d;
+      d.set_mantissa(sx.uintval() % sy.uintval());
+      return d;
+    }
+
+    // Note that hx is not subnormal by conditions above.
+    U m_x = static_cast<U>(sx.get_explicit_mantissa());
+    e_x--;
+
+    U m_y = static_cast<U>(sy.get_explicit_mantissa());
+    constexpr int DEFAULT_LEAD_ZEROS =
+        sizeof(U) * CHAR_BIT - FPB::FRACTION_LEN - 1;
+    int lead_zeros_m_y = DEFAULT_LEAD_ZEROS;
+    if (LIBC_LIKELY(e_y > 0)) {
+      e_y--;
+    } else {
+      m_y = static_cast<U>(sy.get_mantissa());
+      lead_zeros_m_y = cpp::countl_zero(m_y);
+    }
+
+    // Assume hy != 0
+    int tail_zeros_m_y = cpp::countr_zero(m_y);
+    int sides_zeroes_count = lead_zeros_m_y + tail_zeros_m_y;
+    // n > 0 by conditions above
+    int exp_diff = e_x - e_y;
+    {
+      // Shift hy right until the end or n = 0
+      int right_shift = exp_diff < tail_zeros_m_y ? exp_diff : tail_zeros_m_y;
+      m_y >>= right_shift;
+      exp_diff -= right_shift;
+      e_y += right_shift;
+    }
+
+    {
+      // Shift hx left until the end or n = 0
+      int left_shift =
+          exp_diff < DEFAULT_LEAD_ZEROS ? exp_diff : DEFAULT_LEAD_ZEROS;
+      m_x <<= left_shift;
+      exp_diff -= left_shift;
+    }
+
+    m_x %= m_y;
+    if (LIBC_UNLIKELY(m_x == 0))
+      return FPB::zero();
+
+    if (exp_diff == 0)
+      return FPB::make_value(static_cast<StorageType>(m_x), e_y);
+
+    // hx next can't be 0, because hx < hy, hy % 2 == 1 hx * 2^i % hy != 0
+    m_x = DivisionHelper::execute(exp_diff, sides_zeroes_count, m_x, m_y);
+    return FPB::make_value(static_cast<StorageType>(m_x), e_y);
+  }
+
+public:
+  LIBC_INLINE static T eval(T x, T y) {
+    if (T out; LIBC_UNLIKELY(pre_check(x, y, out)))
+      return out;
+    FPB sx(x), sy(y);
+    Sign sign = sx.sign();
+    sx.set_sign(Sign::POS);
+    sy.set_sign(Sign::POS);
+    FPB result = eval_internal(sx, sy);
+    result.set_sign(sign);
+    return result.get_val();
+  }
+};
+
+} // namespace generic
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_FMOD_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/generic/README.md b/contrib/llvm-project/libc/src/__support/FPUtil/generic/README.md
new file mode 100644
index 000000000000..e45812cfe120
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/generic/README.md
@@ -0,0 +1,28 @@
+This directory contains machine independent implementations of floating point
+operations. The implementations are nested in the namespace
+`LIBC_NAMESPACE::fputil::generic`. This is to facilitate calling these generic
+implementations from machine dependent implementations. Consider the example of
+the fuse-multiply-add operation (FMA). The C standard library requires three
+different flavors, `fma` which operates double precision numbers, `fmaf` which
+operates on single precision numbers, and `fmal` which operates on `long double`
+numbers. On aarch64, there are hardware instructions which implement the single
+and double precision flavors but not the `long double` flavor. For such targets,
+we want to be able to call the generic `long double` implementation from the
+`long double` flavor. By putting the generic implementations in a separate
+nested namespace, we will be to call them as follows:
+
+```
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+long double fmal(long double x, long double y, long double z) {
+  return generic::fmal(x, y, z);
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+```
+
+Note that actual code might not be as straightforward as above (for example,
+we might want to prevent implicit type promotions by using some template
+facilities). But, the general idea is very similar.
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/generic/add_sub.h b/contrib/llvm-project/libc/src/__support/FPUtil/generic/add_sub.h
new file mode 100644
index 000000000000..fda702931ef6
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/generic/add_sub.h
@@ -0,0 +1,209 @@
+//===-- Add and subtract IEEE 754 floating-point numbers --------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_ADD_SUB_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_ADD_SUB_H
+
+#include "hdr/fenv_macros.h"
+#include "src/__support/CPP/algorithm.h"
+#include "src/__support/CPP/bit.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/FPUtil/BasicOperations.h"
+#include "src/__support/FPUtil/FEnvImpl.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/FPUtil/cast.h"
+#include "src/__support/FPUtil/dyadic_float.h"
+#include "src/__support/FPUtil/rounding_mode.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil::generic {
+
+template <bool IsSub, typename OutType, typename InType>
+LIBC_INLINE cpp::enable_if_t<cpp::is_floating_point_v<OutType> &&
+                                 cpp::is_floating_point_v<InType> &&
+                                 sizeof(OutType) <= sizeof(InType),
+                             OutType>
+add_or_sub(InType x, InType y) {
+  using OutFPBits = FPBits<OutType>;
+  using OutStorageType = typename OutFPBits::StorageType;
+  using InFPBits = FPBits<InType>;
+  using InStorageType = typename InFPBits::StorageType;
+
+  constexpr int GUARD_BITS_LEN = 3;
+  constexpr int RESULT_FRACTION_LEN = InFPBits::FRACTION_LEN + GUARD_BITS_LEN;
+  constexpr int RESULT_MANTISSA_LEN = RESULT_FRACTION_LEN + 1;
+
+  using DyadicFloat =
+      DyadicFloat<cpp::bit_ceil(static_cast<size_t>(RESULT_MANTISSA_LEN))>;
+
+  InFPBits x_bits(x);
+  InFPBits y_bits(y);
+
+  bool is_effectively_add = (x_bits.sign() == y_bits.sign()) != IsSub;
+
+  if (LIBC_UNLIKELY(x_bits.is_inf_or_nan() || y_bits.is_inf_or_nan() ||
+                    x_bits.is_zero() || y_bits.is_zero())) {
+    if (x_bits.is_nan() || y_bits.is_nan()) {
+      if (x_bits.is_signaling_nan() || y_bits.is_signaling_nan())
+        raise_except_if_required(FE_INVALID);
+
+      if (x_bits.is_quiet_nan()) {
+        InStorageType x_payload = x_bits.get_mantissa();
+        x_payload >>= InFPBits::FRACTION_LEN - OutFPBits::FRACTION_LEN;
+        return OutFPBits::quiet_nan(x_bits.sign(),
+                                    static_cast<OutStorageType>(x_payload))
+            .get_val();
+      }
+
+      if (y_bits.is_quiet_nan()) {
+        InStorageType y_payload = y_bits.get_mantissa();
+        y_payload >>= InFPBits::FRACTION_LEN - OutFPBits::FRACTION_LEN;
+        return OutFPBits::quiet_nan(y_bits.sign(),
+                                    static_cast<OutStorageType>(y_payload))
+            .get_val();
+      }
+
+      return OutFPBits::quiet_nan().get_val();
+    }
+
+    if (x_bits.is_inf()) {
+      if (y_bits.is_inf()) {
+        if (!is_effectively_add) {
+          raise_except_if_required(FE_INVALID);
+          return OutFPBits::quiet_nan().get_val();
+        }
+
+        return OutFPBits::inf(x_bits.sign()).get_val();
+      }
+
+      return OutFPBits::inf(x_bits.sign()).get_val();
+    }
+
+    if (y_bits.is_inf())
+      return OutFPBits::inf(y_bits.sign()).get_val();
+
+    if (x_bits.is_zero()) {
+      if (y_bits.is_zero()) {
+        switch (quick_get_round()) {
+        case FE_DOWNWARD:
+          return OutFPBits::zero(Sign::NEG).get_val();
+        default:
+          return OutFPBits::zero(Sign::POS).get_val();
+        }
+      }
+
+      // volatile prevents Clang from converting tmp to OutType and then
+      // immediately back to InType before negating it, resulting in double
+      // rounding.
+      volatile InType tmp = y;
+      if constexpr (IsSub)
+        tmp = -tmp;
+      return cast<OutType>(tmp);
+    }
+
+    if (y_bits.is_zero())
+      return cast<OutType>(x);
+  }
+
+  InType x_abs = x_bits.abs().get_val();
+  InType y_abs = y_bits.abs().get_val();
+
+  if (x_abs == y_abs && !is_effectively_add) {
+    switch (quick_get_round()) {
+    case FE_DOWNWARD:
+      return OutFPBits::zero(Sign::NEG).get_val();
+    default:
+      return OutFPBits::zero(Sign::POS).get_val();
+    }
+  }
+
+  Sign result_sign = Sign::POS;
+
+  if (x_abs > y_abs) {
+    result_sign = x_bits.sign();
+  } else if (x_abs < y_abs) {
+    if (is_effectively_add)
+      result_sign = y_bits.sign();
+    else if (y_bits.is_pos())
+      result_sign = Sign::NEG;
+  } else if (is_effectively_add) {
+    result_sign = x_bits.sign();
+  }
+
+  InFPBits max_bits(cpp::max(x_abs, y_abs));
+  InFPBits min_bits(cpp::min(x_abs, y_abs));
+
+  InStorageType result_mant;
+
+  if (max_bits.is_subnormal()) {
+    // min_bits must be subnormal too.
+
+    if (is_effectively_add)
+      result_mant = max_bits.get_mantissa() + min_bits.get_mantissa();
+    else
+      result_mant = max_bits.get_mantissa() - min_bits.get_mantissa();
+
+    result_mant <<= GUARD_BITS_LEN;
+  } else {
+    InStorageType max_mant = max_bits.get_explicit_mantissa() << GUARD_BITS_LEN;
+    InStorageType min_mant = min_bits.get_explicit_mantissa() << GUARD_BITS_LEN;
+
+    int alignment = (max_bits.get_biased_exponent() - max_bits.is_normal()) -
+                    (min_bits.get_biased_exponent() - min_bits.is_normal());
+
+    InStorageType aligned_min_mant =
+        min_mant >> cpp::min(alignment, RESULT_MANTISSA_LEN);
+    bool aligned_min_mant_sticky;
+
+    if (alignment <= GUARD_BITS_LEN)
+      aligned_min_mant_sticky = false;
+    else if (alignment > InFPBits::FRACTION_LEN + GUARD_BITS_LEN)
+      aligned_min_mant_sticky = true;
+    else
+      aligned_min_mant_sticky =
+          (static_cast<InStorageType>(
+              min_mant << (InFPBits::STORAGE_LEN - alignment))) != 0;
+
+    InStorageType min_mant_sticky(static_cast<int>(aligned_min_mant_sticky));
+
+    if (is_effectively_add)
+      result_mant = max_mant + (aligned_min_mant | min_mant_sticky);
+    else
+      result_mant = max_mant - (aligned_min_mant | min_mant_sticky);
+  }
+
+  int result_exp = max_bits.get_explicit_exponent() - RESULT_FRACTION_LEN;
+  DyadicFloat result(result_sign, result_exp, result_mant);
+  return result.template as<OutType, /*ShouldSignalExceptions=*/true>();
+}
+
+template <typename OutType, typename InType>
+LIBC_INLINE cpp::enable_if_t<cpp::is_floating_point_v<OutType> &&
+                                 cpp::is_floating_point_v<InType> &&
+                                 sizeof(OutType) <= sizeof(InType),
+                             OutType>
+add(InType x, InType y) {
+  return add_or_sub</*IsSub=*/false, OutType>(x, y);
+}
+
+template <typename OutType, typename InType>
+LIBC_INLINE cpp::enable_if_t<cpp::is_floating_point_v<OutType> &&
+                                 cpp::is_floating_point_v<InType> &&
+                                 sizeof(OutType) <= sizeof(InType),
+                             OutType>
+sub(InType x, InType y) {
+  return add_or_sub</*IsSub=*/true, OutType>(x, y);
+}
+
+} // namespace fputil::generic
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_ADD_SUB_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/generic/div.h b/contrib/llvm-project/libc/src/__support/FPUtil/generic/div.h
new file mode 100644
index 000000000000..f0e405772e9f
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/generic/div.h
@@ -0,0 +1,126 @@
+//===-- Division of IEEE 754 floating-point numbers -------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_DIV_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_DIV_H
+
+#include "hdr/errno_macros.h"
+#include "hdr/fenv_macros.h"
+#include "src/__support/CPP/bit.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/FPUtil/BasicOperations.h"
+#include "src/__support/FPUtil/FEnvImpl.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/FPUtil/dyadic_float.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil::generic {
+
+template <typename OutType, typename InType>
+LIBC_INLINE cpp::enable_if_t<cpp::is_floating_point_v<OutType> &&
+                                 cpp::is_floating_point_v<InType> &&
+                                 sizeof(OutType) <= sizeof(InType),
+                             OutType>
+div(InType x, InType y) {
+  using OutFPBits = FPBits<OutType>;
+  using OutStorageType = typename OutFPBits::StorageType;
+  using InFPBits = FPBits<InType>;
+  using InStorageType = typename InFPBits::StorageType;
+  using DyadicFloat =
+      DyadicFloat<cpp::bit_ceil(static_cast<size_t>(InFPBits::SIG_LEN + 1))>;
+
+  InFPBits x_bits(x);
+  InFPBits y_bits(y);
+
+  Sign result_sign = x_bits.sign() == y_bits.sign() ? Sign::POS : Sign::NEG;
+
+  if (LIBC_UNLIKELY(x_bits.is_inf_or_nan() || y_bits.is_inf_or_nan() ||
+                    x_bits.is_zero() || y_bits.is_zero())) {
+    if (x_bits.is_nan() || y_bits.is_nan()) {
+      if (x_bits.is_signaling_nan() || y_bits.is_signaling_nan())
+        raise_except_if_required(FE_INVALID);
+
+      if (x_bits.is_quiet_nan()) {
+        InStorageType x_payload = x_bits.get_mantissa();
+        x_payload >>= InFPBits::FRACTION_LEN - OutFPBits::FRACTION_LEN;
+        return OutFPBits::quiet_nan(x_bits.sign(),
+                                    static_cast<OutStorageType>(x_payload))
+            .get_val();
+      }
+
+      if (y_bits.is_quiet_nan()) {
+        InStorageType y_payload = y_bits.get_mantissa();
+        y_payload >>= InFPBits::FRACTION_LEN - OutFPBits::FRACTION_LEN;
+        return OutFPBits::quiet_nan(y_bits.sign(),
+                                    static_cast<OutStorageType>(y_payload))
+            .get_val();
+      }
+
+      return OutFPBits::quiet_nan().get_val();
+    }
+
+    if (x_bits.is_inf()) {
+      if (y_bits.is_inf()) {
+        set_errno_if_required(EDOM);
+        raise_except_if_required(FE_INVALID);
+        return OutFPBits::quiet_nan().get_val();
+      }
+
+      return OutFPBits::inf(result_sign).get_val();
+    }
+
+    if (y_bits.is_inf())
+      return OutFPBits::inf(result_sign).get_val();
+
+    if (y_bits.is_zero()) {
+      if (x_bits.is_zero()) {
+        raise_except_if_required(FE_INVALID);
+        return OutFPBits::quiet_nan().get_val();
+      }
+
+      raise_except_if_required(FE_DIVBYZERO);
+      return OutFPBits::inf(result_sign).get_val();
+    }
+
+    if (x_bits.is_zero())
+      return OutFPBits::zero(result_sign).get_val();
+  }
+
+  DyadicFloat xd(x);
+  DyadicFloat yd(y);
+
+  // Number of iterations = full output precision + 1 rounding bit + 1 potential
+  // leading 0.
+  constexpr int NUM_ITERS = OutFPBits::FRACTION_LEN + 3;
+  int result_exp = xd.exponent - yd.exponent - (NUM_ITERS - 1);
+
+  InStorageType q = 0;
+  InStorageType r = static_cast<InStorageType>(xd.mantissa >> 2);
+  InStorageType yd_mant_in = static_cast<InStorageType>(yd.mantissa >> 1);
+
+  for (int i = 0; i < NUM_ITERS; ++i) {
+    q <<= 1;
+    r <<= 1;
+    if (r >= yd_mant_in) {
+      q += 1;
+      r -= yd_mant_in;
+    }
+  }
+
+  DyadicFloat result(result_sign, result_exp, q);
+  result.mantissa |= static_cast<unsigned int>(r != 0);
+  return result.template as<OutType, /*ShouldSignalExceptions=*/true>();
+}
+
+} // namespace fputil::generic
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_DIV_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/generic/mul.h b/contrib/llvm-project/libc/src/__support/FPUtil/generic/mul.h
new file mode 100644
index 000000000000..20d9a7779276
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/generic/mul.h
@@ -0,0 +1,105 @@
+//===-- Multiplication of IEEE 754 floating-point numbers -------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_MUL_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_MUL_H
+
+#include "hdr/errno_macros.h"
+#include "hdr/fenv_macros.h"
+#include "src/__support/CPP/bit.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/FPUtil/BasicOperations.h"
+#include "src/__support/FPUtil/FEnvImpl.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/FPUtil/dyadic_float.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil::generic {
+
+template <typename OutType, typename InType>
+LIBC_INLINE cpp::enable_if_t<cpp::is_floating_point_v<OutType> &&
+                                 cpp::is_floating_point_v<InType> &&
+                                 sizeof(OutType) <= sizeof(InType),
+                             OutType>
+mul(InType x, InType y) {
+  using OutFPBits = FPBits<OutType>;
+  using OutStorageType = typename OutFPBits::StorageType;
+  using InFPBits = FPBits<InType>;
+  using InStorageType = typename InFPBits::StorageType;
+  // The product of two p-digit numbers is a 2p-digit number.
+  using DyadicFloat =
+      DyadicFloat<cpp::bit_ceil(2 * static_cast<size_t>(InFPBits::SIG_LEN))>;
+
+  InFPBits x_bits(x);
+  InFPBits y_bits(y);
+
+  Sign result_sign = x_bits.sign() == y_bits.sign() ? Sign::POS : Sign::NEG;
+
+  if (LIBC_UNLIKELY(x_bits.is_inf_or_nan() || y_bits.is_inf_or_nan() ||
+                    x_bits.is_zero() || y_bits.is_zero())) {
+    if (x_bits.is_nan() || y_bits.is_nan()) {
+      if (x_bits.is_signaling_nan() || y_bits.is_signaling_nan())
+        raise_except_if_required(FE_INVALID);
+
+      if (x_bits.is_quiet_nan()) {
+        InStorageType x_payload = x_bits.get_mantissa();
+        x_payload >>= InFPBits::FRACTION_LEN - OutFPBits::FRACTION_LEN;
+        return OutFPBits::quiet_nan(x_bits.sign(),
+                                    static_cast<OutStorageType>(x_payload))
+            .get_val();
+      }
+
+      if (y_bits.is_quiet_nan()) {
+        InStorageType y_payload = y_bits.get_mantissa();
+        y_payload >>= InFPBits::FRACTION_LEN - OutFPBits::FRACTION_LEN;
+        return OutFPBits::quiet_nan(y_bits.sign(),
+                                    static_cast<OutStorageType>(y_payload))
+            .get_val();
+      }
+
+      return OutFPBits::quiet_nan().get_val();
+    }
+
+    if (x_bits.is_inf()) {
+      if (y_bits.is_zero()) {
+        set_errno_if_required(EDOM);
+        raise_except_if_required(FE_INVALID);
+        return OutFPBits::quiet_nan().get_val();
+      }
+
+      return OutFPBits::inf(result_sign).get_val();
+    }
+
+    if (y_bits.is_inf()) {
+      if (x_bits.is_zero()) {
+        set_errno_if_required(EDOM);
+        raise_except_if_required(FE_INVALID);
+        return OutFPBits::quiet_nan().get_val();
+      }
+
+      return OutFPBits::inf(result_sign).get_val();
+    }
+
+    // Now either x or y is zero, and the other one is finite.
+    return OutFPBits::zero(result_sign).get_val();
+  }
+
+  DyadicFloat xd(x);
+  DyadicFloat yd(y);
+
+  DyadicFloat result = quick_mul(xd, yd);
+  return result.template as<OutType, /*ShouldSignalExceptions=*/true>();
+}
+
+} // namespace fputil::generic
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_MUL_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/generic/sqrt.h b/contrib/llvm-project/libc/src/__support/FPUtil/generic/sqrt.h
new file mode 100644
index 000000000000..497ebd145c6b
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/generic/sqrt.h
@@ -0,0 +1,171 @@
+//===-- Square root of IEEE 754 floating point numbers ----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_SQRT_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_SQRT_H
+
+#include "sqrt_80_bit_long_double.h"
+#include "src/__support/CPP/bit.h" // countl_zero
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/FPUtil/FEnvImpl.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/FPUtil/cast.h"
+#include "src/__support/FPUtil/dyadic_float.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/uint128.h"
+
+#include "hdr/fenv_macros.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+namespace internal {
+
+template <typename T> struct SpecialLongDouble {
+  static constexpr bool VALUE = false;
+};
+
+#if defined(LIBC_TYPES_LONG_DOUBLE_IS_X86_FLOAT80)
+template <> struct SpecialLongDouble<long double> {
+  static constexpr bool VALUE = true;
+};
+#endif // LIBC_TYPES_LONG_DOUBLE_IS_X86_FLOAT80
+
+template <typename T>
+LIBC_INLINE void normalize(int &exponent,
+                           typename FPBits<T>::StorageType &mantissa) {
+  const int shift =
+      cpp::countl_zero(mantissa) -
+      (8 * static_cast<int>(sizeof(mantissa)) - 1 - FPBits<T>::FRACTION_LEN);
+  exponent -= shift;
+  mantissa <<= shift;
+}
+
+#ifdef LIBC_TYPES_LONG_DOUBLE_IS_FLOAT64
+template <>
+LIBC_INLINE void normalize<long double>(int &exponent, uint64_t &mantissa) {
+  normalize<double>(exponent, mantissa);
+}
+#elif !defined(LIBC_TYPES_LONG_DOUBLE_IS_X86_FLOAT80)
+template <>
+LIBC_INLINE void normalize<long double>(int &exponent, UInt128 &mantissa) {
+  const uint64_t hi_bits = static_cast<uint64_t>(mantissa >> 64);
+  const int shift =
+      hi_bits ? (cpp::countl_zero(hi_bits) - 15)
+              : (cpp::countl_zero(static_cast<uint64_t>(mantissa)) + 49);
+  exponent -= shift;
+  mantissa <<= shift;
+}
+#endif
+
+} // namespace internal
+
+// Correctly rounded IEEE 754 SQRT for all rounding modes.
+// Shift-and-add algorithm.
+template <typename OutType, typename InType>
+LIBC_INLINE cpp::enable_if_t<cpp::is_floating_point_v<OutType> &&
+                                 cpp::is_floating_point_v<InType> &&
+                                 sizeof(OutType) <= sizeof(InType),
+                             OutType>
+sqrt(InType x) {
+  if constexpr (internal::SpecialLongDouble<OutType>::VALUE &&
+                internal::SpecialLongDouble<InType>::VALUE) {
+    // Special 80-bit long double.
+    return x86::sqrt(x);
+  } else {
+    // IEEE floating points formats.
+    using OutFPBits = FPBits<OutType>;
+    using InFPBits = FPBits<InType>;
+    using InStorageType = typename InFPBits::StorageType;
+    using DyadicFloat =
+        DyadicFloat<cpp::bit_ceil(static_cast<size_t>(InFPBits::STORAGE_LEN))>;
+
+    constexpr InStorageType ONE = InStorageType(1) << InFPBits::FRACTION_LEN;
+    constexpr auto FLT_NAN = OutFPBits::quiet_nan().get_val();
+
+    InFPBits bits(x);
+
+    if (bits == InFPBits::inf(Sign::POS) || bits.is_zero() || bits.is_nan()) {
+      // sqrt(+Inf) = +Inf
+      // sqrt(+0) = +0
+      // sqrt(-0) = -0
+      // sqrt(NaN) = NaN
+      // sqrt(-NaN) = -NaN
+      return cast<OutType>(x);
+    } else if (bits.is_neg()) {
+      // sqrt(-Inf) = NaN
+      // sqrt(-x) = NaN
+      return FLT_NAN;
+    } else {
+      int x_exp = bits.get_exponent();
+      InStorageType x_mant = bits.get_mantissa();
+
+      // Step 1a: Normalize denormal input and append hidden bit to the mantissa
+      if (bits.is_subnormal()) {
+        ++x_exp; // let x_exp be the correct exponent of ONE bit.
+        internal::normalize<InType>(x_exp, x_mant);
+      } else {
+        x_mant |= ONE;
+      }
+
+      // Step 1b: Make sure the exponent is even.
+      if (x_exp & 1) {
+        --x_exp;
+        x_mant <<= 1;
+      }
+
+      // After step 1b, x = 2^(x_exp) * x_mant, where x_exp is even, and
+      // 1 <= x_mant < 4.  So sqrt(x) = 2^(x_exp / 2) * y, with 1 <= y < 2.
+      // Notice that the output of sqrt is always in the normal range.
+      // To perform shift-and-add algorithm to find y, let denote:
+      //   y(n) = 1.y_1 y_2 ... y_n, we can define the nth residue to be:
+      //   r(n) = 2^n ( x_mant - y(n)^2 ).
+      // That leads to the following recurrence formula:
+      //   r(n) = 2*r(n-1) - y_n*[ 2*y(n-1) + 2^(-n-1) ]
+      // with the initial conditions: y(0) = 1, and r(0) = x - 1.
+      // So the nth digit y_n of the mantissa of sqrt(x) can be found by:
+      //   y_n = 1 if 2*r(n-1) >= 2*y(n - 1) + 2^(-n-1)
+      //         0 otherwise.
+      InStorageType y = ONE;
+      InStorageType r = x_mant - ONE;
+
+      // TODO: Reduce iteration count to OutFPBits::FRACTION_LEN + 2 or + 3.
+      for (InStorageType current_bit = ONE >> 1; current_bit;
+           current_bit >>= 1) {
+        r <<= 1;
+        // 2*y(n - 1) + 2^(-n-1)
+        InStorageType tmp = static_cast<InStorageType>((y << 1) + current_bit);
+        if (r >= tmp) {
+          r -= tmp;
+          y += current_bit;
+        }
+      }
+
+      // We compute one more iteration in order to round correctly.
+      r <<= 2;
+      y <<= 2;
+      InStorageType tmp = y + 1;
+      if (r >= tmp) {
+        r -= tmp;
+        // Rounding bit.
+        y |= 2;
+      }
+      // Sticky bit.
+      y |= static_cast<unsigned int>(r != 0);
+
+      DyadicFloat yd(Sign::POS, (x_exp >> 1) - 2 - InFPBits::FRACTION_LEN, y);
+      return yd.template as<OutType, /*ShouldSignalExceptions=*/true>();
+    }
+  }
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_SQRT_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/generic/sqrt_80_bit_long_double.h b/contrib/llvm-project/libc/src/__support/FPUtil/generic/sqrt_80_bit_long_double.h
new file mode 100644
index 000000000000..0ba836d17a08
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/generic/sqrt_80_bit_long_double.h
@@ -0,0 +1,141 @@
+//===-- Square root of x86 long double numbers ------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_SQRT_80_BIT_LONG_DOUBLE_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_SQRT_80_BIT_LONG_DOUBLE_H
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/FPUtil/FEnvImpl.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/FPUtil/rounding_mode.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/uint128.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+namespace x86 {
+
+LIBC_INLINE void normalize(int &exponent,
+                           FPBits<long double>::StorageType &mantissa) {
+  const unsigned int shift = static_cast<unsigned int>(
+      static_cast<size_t>(cpp::countl_zero(static_cast<uint64_t>(mantissa))) -
+      (8 * sizeof(uint64_t) - 1 - FPBits<long double>::FRACTION_LEN));
+  exponent -= shift;
+  mantissa <<= shift;
+}
+
+// if constexpr statement in sqrt.h still requires x86::sqrt to be declared
+// even when it's not used.
+LIBC_INLINE long double sqrt(long double x);
+
+// Correctly rounded SQRT for all rounding modes.
+// Shift-and-add algorithm.
+#if defined(LIBC_TYPES_LONG_DOUBLE_IS_X86_FLOAT80)
+LIBC_INLINE long double sqrt(long double x) {
+  using LDBits = FPBits<long double>;
+  using StorageType = typename LDBits::StorageType;
+  constexpr StorageType ONE = StorageType(1) << int(LDBits::FRACTION_LEN);
+  constexpr auto LDNAN = LDBits::quiet_nan().get_val();
+
+  LDBits bits(x);
+
+  if (bits == LDBits::inf(Sign::POS) || bits.is_zero() || bits.is_nan()) {
+    // sqrt(+Inf) = +Inf
+    // sqrt(+0) = +0
+    // sqrt(-0) = -0
+    // sqrt(NaN) = NaN
+    // sqrt(-NaN) = -NaN
+    return x;
+  } else if (bits.is_neg()) {
+    // sqrt(-Inf) = NaN
+    // sqrt(-x) = NaN
+    return LDNAN;
+  } else {
+    int x_exp = bits.get_explicit_exponent();
+    StorageType x_mant = bits.get_mantissa();
+
+    // Step 1a: Normalize denormal input
+    if (bits.get_implicit_bit()) {
+      x_mant |= ONE;
+    } else if (bits.is_subnormal()) {
+      normalize(x_exp, x_mant);
+    }
+
+    // Step 1b: Make sure the exponent is even.
+    if (x_exp & 1) {
+      --x_exp;
+      x_mant <<= 1;
+    }
+
+    // After step 1b, x = 2^(x_exp) * x_mant, where x_exp is even, and
+    // 1 <= x_mant < 4.  So sqrt(x) = 2^(x_exp / 2) * y, with 1 <= y < 2.
+    // Notice that the output of sqrt is always in the normal range.
+    // To perform shift-and-add algorithm to find y, let denote:
+    //   y(n) = 1.y_1 y_2 ... y_n, we can define the nth residue to be:
+    //   r(n) = 2^n ( x_mant - y(n)^2 ).
+    // That leads to the following recurrence formula:
+    //   r(n) = 2*r(n-1) - y_n*[ 2*y(n-1) + 2^(-n-1) ]
+    // with the initial conditions: y(0) = 1, and r(0) = x - 1.
+    // So the nth digit y_n of the mantissa of sqrt(x) can be found by:
+    //   y_n = 1 if 2*r(n-1) >= 2*y(n - 1) + 2^(-n-1)
+    //         0 otherwise.
+    StorageType y = ONE;
+    StorageType r = x_mant - ONE;
+
+    for (StorageType current_bit = ONE >> 1; current_bit; current_bit >>= 1) {
+      r <<= 1;
+      StorageType tmp = (y << 1) + current_bit; // 2*y(n - 1) + 2^(-n-1)
+      if (r >= tmp) {
+        r -= tmp;
+        y += current_bit;
+      }
+    }
+
+    // We compute one more iteration in order to round correctly.
+    bool lsb = static_cast<bool>(y & 1); // Least significant bit
+    bool rb = false;                     // Round bit
+    r <<= 2;
+    StorageType tmp = (y << 2) + 1;
+    if (r >= tmp) {
+      r -= tmp;
+      rb = true;
+    }
+
+    // Append the exponent field.
+    x_exp = ((x_exp >> 1) + LDBits::EXP_BIAS);
+    y |= (static_cast<StorageType>(x_exp) << (LDBits::FRACTION_LEN + 1));
+
+    switch (quick_get_round()) {
+    case FE_TONEAREST:
+      // Round to nearest, ties to even
+      if (rb && (lsb || (r != 0)))
+        ++y;
+      break;
+    case FE_UPWARD:
+      if (rb || (r != 0))
+        ++y;
+      break;
+    }
+
+    // Extract output
+    FPBits<long double> out(0.0L);
+    out.set_biased_exponent(x_exp);
+    out.set_implicit_bit(1);
+    out.set_mantissa((y & (ONE - 1)));
+
+    return out.get_val();
+  }
+}
+#endif // LIBC_TYPES_LONG_DOUBLE_IS_X86_FLOAT80
+
+} // namespace x86
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_GENERIC_SQRT_80_BIT_LONG_DOUBLE_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/multiply_add.h b/contrib/llvm-project/libc/src/__support/FPUtil/multiply_add.h
new file mode 100644
index 000000000000..8260702e2c9f
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/multiply_add.h
@@ -0,0 +1,74 @@
+//===-- Common header for multiply-add implementations ----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_MULTIPLY_ADD_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_MULTIPLY_ADD_H
+
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+#include "src/__support/macros/properties/cpu_features.h" // LIBC_TARGET_CPU_HAS_FMA
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+// Implement a simple wrapper for multiply-add operation:
+//   multiply_add(x, y, z) = x*y + z
+// which uses FMA instructions to speed up if available.
+
+template <typename T>
+LIBC_INLINE cpp::enable_if_t<(sizeof(T) > sizeof(void *)), T>
+multiply_add(const T &x, const T &y, const T &z) {
+  return x * y + z;
+}
+
+template <typename T>
+LIBC_INLINE cpp::enable_if_t<(sizeof(T) <= sizeof(void *)), T>
+multiply_add(T x, T y, T z) {
+  return x * y + z;
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#if defined(LIBC_TARGET_CPU_HAS_FMA)
+
+// FMA instructions are available.
+// We use builtins directly instead of including FMA.h to avoid a circular
+// dependency: multiply_add.h -> FMA.h -> generic/FMA.h -> dyadic_float.h.
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+#ifdef LIBC_TARGET_CPU_HAS_FMA_FLOAT
+LIBC_INLINE float multiply_add(float x, float y, float z) {
+#if __has_builtin(__builtin_elementwise_fma)
+  return __builtin_elementwise_fma(x, y, z);
+#else
+  return __builtin_fmaf(x, y, z);
+#endif
+}
+#endif // LIBC_TARGET_CPU_HAS_FMA_FLOAT
+
+#ifdef LIBC_TARGET_CPU_HAS_FMA_DOUBLE
+LIBC_INLINE double multiply_add(double x, double y, double z) {
+#if __has_builtin(__builtin_elementwise_fma)
+  return __builtin_elementwise_fma(x, y, z);
+#else
+  return __builtin_fma(x, y, z);
+#endif
+}
+#endif // LIBC_TARGET_CPU_HAS_FMA_DOUBLE
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LIBC_TARGET_CPU_HAS_FMA
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_MULTIPLY_ADD_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/nearest_integer.h b/contrib/llvm-project/libc/src/__support/FPUtil/nearest_integer.h
new file mode 100644
index 000000000000..768f13414bd9
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/nearest_integer.h
@@ -0,0 +1,79 @@
+//===-- Fast rounding to nearest integer for floating point -----*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_NEAREST_INTEGER_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_NEAREST_INTEGER_H
+
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
+#include "src/__support/macros/properties/architectures.h"
+#include "src/__support/macros/properties/cpu_features.h"
+
+#if (defined(LIBC_TARGET_ARCH_IS_X86_64) && defined(LIBC_TARGET_CPU_HAS_SSE4_2))
+#include "x86_64/nearest_integer.h"
+#elif (defined(LIBC_TARGET_ARCH_IS_AARCH64) && defined(__ARM_FP))
+#include "aarch64/nearest_integer.h"
+#elif defined(LIBC_TARGET_ARCH_IS_GPU)
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+LIBC_INLINE float nearest_integer(float x) { return __builtin_rintf(x); }
+
+LIBC_INLINE double nearest_integer(double x) { return __builtin_rint(x); }
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#else
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+// This is a fast implementation for rounding to a nearest integer that.
+//
+// Notice that for AARCH64 and x86-64 with SSE4.2 support, we will use their
+// corresponding rounding instruction instead.  And in those cases, the results
+// are rounded to the nearest integer, tie-to-even.
+LIBC_INLINE float nearest_integer(float x) {
+  if (x < 0x1p24f && x > -0x1p24f) {
+    float r = x < 0 ? (x - 0x1.0p23f) + 0x1.0p23f : (x + 0x1.0p23f) - 0x1.0p23f;
+    float diff = x - r;
+    // The expression above is correct for the default rounding mode, round-to-
+    // nearest, tie-to-even.  For other rounding modes, it might be off by 1,
+    // which is corrected below.
+    if (LIBC_UNLIKELY(diff > 0.5f))
+      return r + 1.0f;
+    if (LIBC_UNLIKELY(diff < -0.5f))
+      return r - 1.0f;
+    return r;
+  }
+  return x;
+}
+
+LIBC_INLINE double nearest_integer(double x) {
+  if (x < 0x1p53 && x > -0x1p53) {
+    double r = x < 0 ? (x - 0x1.0p52) + 0x1.0p52 : (x + 0x1.0p52) - 0x1.0p52;
+    double diff = x - r;
+    // The expression above is correct for the default rounding mode, round-to-
+    // nearest, tie-to-even.  For other rounding modes, it might be off by 1,
+    // which is corrected below.
+    if (LIBC_UNLIKELY(diff > 0.5))
+      return r + 1.0;
+    if (LIBC_UNLIKELY(diff < -0.5))
+      return r - 1.0;
+    return r;
+  }
+  return x;
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_NEAREST_INTEGER_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/riscv/FEnvImpl.h b/contrib/llvm-project/libc/src/__support/FPUtil/riscv/FEnvImpl.h
new file mode 100644
index 000000000000..2f525eb5dac5
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/riscv/FEnvImpl.h
@@ -0,0 +1,181 @@
+//===-- riscv floating point env manipulation functions ---------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_RISCV_FENVIMPL_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_RISCV_FENVIMPL_H
+
+#include "hdr/fenv_macros.h"
+#include "hdr/types/fenv_t.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/macros/attributes.h" // For LIBC_INLINE_ASM
+#include "src/__support/macros/config.h"     // For LIBC_INLINE
+
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+struct FEnv {
+  // We will ignore RMM and DYN rounding modes.
+  static constexpr uint32_t TONEAREST = 0x0;
+  static constexpr uint32_t TOWARDZERO = 0x1;
+  static constexpr uint32_t DOWNWARD = 0x2;
+  static constexpr uint32_t UPWARD = 0x3;
+
+  // These are the bit locations of the corresponding exceptions in fcsr.
+  static constexpr uint32_t INEXACT = 0x1;
+  static constexpr uint32_t UNDERFLOW = 0x2;
+  static constexpr uint32_t OVERFLOW = 0x4;
+  static constexpr uint32_t DIVBYZERO = 0x8;
+  static constexpr uint32_t INVALID = 0x10;
+
+  LIBC_INLINE static uint32_t get_frm() {
+    unsigned int rm;
+    LIBC_INLINE_ASM("frrm %0\n\t" : "=r"(rm));
+    return rm;
+  }
+
+  LIBC_INLINE static void set_frm(uint32_t rm) {
+    LIBC_INLINE_ASM("fsrm %0, %0\n\t" : "+r"(rm));
+  }
+
+  LIBC_INLINE static uint32_t get_fflags() {
+    unsigned int flags;
+    LIBC_INLINE_ASM("frflags %0\n\t" : "=r"(flags));
+    return flags;
+  }
+
+  LIBC_INLINE static void set_fflags(uint32_t flags) {
+    LIBC_INLINE_ASM("fsflags %0, %0\n\t" : "+r"(flags));
+  }
+
+  LIBC_INLINE static uint32_t get_fcsr() {
+    unsigned int fcsr;
+    LIBC_INLINE_ASM("frcsr %0\n\t" : "=r"(fcsr));
+    return fcsr;
+  }
+
+  LIBC_INLINE static void set_fcsr(uint32_t fcsr) {
+    LIBC_INLINE_ASM("fscsr %0, %0\n\t" : "+r"(fcsr));
+  }
+
+  LIBC_INLINE static int exception_bits_to_macro(uint32_t status) {
+    return ((status & INVALID) ? FE_INVALID : 0) |
+           ((status & DIVBYZERO) ? FE_DIVBYZERO : 0) |
+           ((status & OVERFLOW) ? FE_OVERFLOW : 0) |
+           ((status & UNDERFLOW) ? FE_UNDERFLOW : 0) |
+           ((status & INEXACT) ? FE_INEXACT : 0);
+  }
+
+  LIBC_INLINE static uint32_t exception_macro_to_bits(int except) {
+    return ((except & FE_INVALID) ? INVALID : 0) |
+           ((except & FE_DIVBYZERO) ? DIVBYZERO : 0) |
+           ((except & FE_OVERFLOW) ? OVERFLOW : 0) |
+           ((except & FE_UNDERFLOW) ? UNDERFLOW : 0) |
+           ((except & FE_INEXACT) ? INEXACT : 0);
+  }
+};
+
+// Since RISCV does not have exception enable bits, we will just return
+// the failure indicator.
+LIBC_INLINE int enable_except(int) { return -1; }
+
+// Always succeed.
+LIBC_INLINE int disable_except(int) { return 0; }
+
+// Always return "no exceptions enabled".
+LIBC_INLINE int get_except() { return 0; }
+
+LIBC_INLINE int clear_except(int excepts) {
+  uint32_t flags = FEnv::get_fflags();
+  uint32_t to_clear = FEnv::exception_macro_to_bits(excepts);
+  flags &= ~to_clear;
+  FEnv::set_fflags(flags);
+  return 0;
+}
+
+LIBC_INLINE int test_except(int excepts) {
+  uint32_t to_test = FEnv::exception_macro_to_bits(excepts);
+  uint32_t flags = FEnv::get_fflags();
+  return FEnv::exception_bits_to_macro(flags & to_test);
+}
+
+LIBC_INLINE int set_except(int excepts) {
+  uint32_t flags = FEnv::get_fflags();
+  FEnv::set_fflags(flags | FEnv::exception_macro_to_bits(excepts));
+  return 0;
+}
+
+LIBC_INLINE int raise_except(int excepts) {
+  // Since there are no traps, we just set the exception flags.
+  uint32_t flags = FEnv::get_fflags();
+  FEnv::set_fflags(flags | FEnv::exception_macro_to_bits(excepts));
+  return 0;
+}
+
+LIBC_INLINE int get_round() {
+  uint32_t rm = FEnv::get_frm();
+  switch (rm) {
+  case FEnv::TONEAREST:
+    return FE_TONEAREST;
+  case FEnv::DOWNWARD:
+    return FE_DOWNWARD;
+  case FEnv::UPWARD:
+    return FE_UPWARD;
+  case FEnv::TOWARDZERO:
+    return FE_TOWARDZERO;
+  default:
+    return -1; // Error value.
+  }
+  return 0;
+}
+
+LIBC_INLINE int set_round(int mode) {
+  uint32_t rm;
+  switch (mode) {
+  case FE_TONEAREST:
+    rm = FEnv::TONEAREST;
+    break;
+  case FE_DOWNWARD:
+    rm = FEnv::DOWNWARD;
+    break;
+  case FE_UPWARD:
+    rm = FEnv::UPWARD;
+    break;
+  case FE_TOWARDZERO:
+    rm = FEnv::TOWARDZERO;
+    break;
+  default:
+    return -1; // To indicate failure
+  }
+  FEnv::set_frm(rm);
+  return 0;
+}
+
+LIBC_INLINE int get_env(fenv_t *envp) {
+  uint32_t *state = reinterpret_cast<uint32_t *>(envp);
+  *state = FEnv::get_fcsr();
+  return 0;
+}
+
+LIBC_INLINE int set_env(const fenv_t *envp) {
+  if (envp == FE_DFL_ENV) {
+    FEnv::set_frm(FEnv::TONEAREST);
+    FEnv::set_fflags(0);
+    return 0;
+  }
+  uint32_t status = *reinterpret_cast<const uint32_t *>(envp);
+  // We have to do the masking to preserve the reserved bits.
+  FEnv::set_fcsr((status & 0xFF) | (FEnv::get_fcsr() & 0xFFFFFF00));
+  return 0;
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_RISCV_FENVIMPL_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/riscv/sqrt.h b/contrib/llvm-project/libc/src/__support/FPUtil/riscv/sqrt.h
new file mode 100644
index 000000000000..8cff03a9fc73
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/riscv/sqrt.h
@@ -0,0 +1,45 @@
+//===-- Square root of IEEE 754 floating point numbers ----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_RISCV_SQRT_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_RISCV_SQRT_H
+
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+#include "src/__support/macros/properties/cpu_features.h"
+
+#if !defined(LIBC_TARGET_ARCH_IS_ANY_RISCV)
+#error "Invalid include"
+#endif
+
+#include "src/__support/FPUtil/generic/sqrt.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+#ifdef LIBC_TARGET_CPU_HAS_FPU_FLOAT
+template <> LIBC_INLINE float sqrt<float>(float x) {
+  float result;
+  asm("fsqrt.s %0, %1\n\t" : "=f"(result) : "f"(x));
+  return result;
+}
+#endif // LIBC_TARGET_CPU_HAS_FPU_FLOAT
+
+#ifdef LIBC_TARGET_CPU_HAS_FPU_DOUBLE
+template <> LIBC_INLINE double sqrt<double>(double x) {
+  double result;
+  asm("fsqrt.d %0, %1\n\t" : "=f"(result) : "f"(x));
+  return result;
+}
+#endif // LIBC_TARGET_CPU_HAS_FPU_FLOAT
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_RISCV_SQRT_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/rounding_mode.h b/contrib/llvm-project/libc/src/__support/FPUtil/rounding_mode.h
new file mode 100644
index 000000000000..bc66d09b9416
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/rounding_mode.h
@@ -0,0 +1,81 @@
+//===---- Free-standing function to detect rounding mode --------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_ROUNDING_MODE_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_ROUNDING_MODE_H
+
+#include "hdr/fenv_macros.h"
+#include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+// Quick free-standing test whether fegetround() == FE_UPWARD.
+// Using the following observation:
+//   1.0f + 2^-25 = 1.0f        for FE_TONEAREST, FE_DOWNWARD, FE_TOWARDZERO
+//                = 0x1.000002f for FE_UPWARD.
+LIBC_INLINE bool fenv_is_round_up() {
+  volatile float x = 0x1.0p-25f;
+  return (1.0f + x != 1.0f);
+}
+
+// Quick free-standing test whether fegetround() == FE_DOWNWARD.
+// Using the following observation:
+//   -1.0f - 2^-25 = -1.0f        for FE_TONEAREST, FE_UPWARD, FE_TOWARDZERO
+//                 = -0x1.000002f for FE_DOWNWARD.
+LIBC_INLINE bool fenv_is_round_down() {
+  volatile float x = 0x1.0p-25f;
+  return (-1.0f - x != -1.0f);
+}
+
+// Quick free-standing test whether fegetround() == FE_TONEAREST.
+// Using the following observation:
+//   1.5f + 2^-24 = 1.5f           for FE_TONEAREST, FE_DOWNWARD, FE_TOWARDZERO
+//                = 0x1.100002p0f  for FE_UPWARD,
+//   1.5f - 2^-24 = 1.5f           for FE_TONEAREST, FE_UPWARD
+//                = 0x1.0ffffep-1f for FE_DOWNWARD, FE_TOWARDZERO
+LIBC_INLINE bool fenv_is_round_to_nearest() {
+  static volatile float x = 0x1.0p-24f;
+  float y = x;
+  return (1.5f + y == 1.5f - y);
+}
+
+// Quick free-standing test whether fegetround() == FE_TOWARDZERO.
+// Using the following observation:
+//   1.0f + 2^-23 + 2^-24 = 0x1.000002p0f for FE_DOWNWARD, FE_TOWARDZERO
+//                        = 0x1.000004p0f for FE_TONEAREST, FE_UPWARD,
+//  -1.0f - 2^-24 = -1.0f          for FE_TONEAREST, FE_UPWARD, FE_TOWARDZERO
+//                = -0x1.000002p0f for FE_DOWNWARD
+// So:
+// (0x1.000002p0f + 2^-24) + (-1.0f - 2^-24) = 2^-23 for FE_TOWARDZERO
+//                                           = 2^-22 for FE_TONEAREST, FE_UPWARD
+//                                           = 0 for FE_DOWNWARD
+LIBC_INLINE bool fenv_is_round_to_zero() {
+  static volatile float x = 0x1.0p-24f;
+  float y = x;
+  return ((0x1.000002p0f + y) + (-1.0f - y) == 0x1.0p-23f);
+}
+
+// Quick free standing get rounding mode based on the above observations.
+LIBC_INLINE int quick_get_round() {
+  static volatile float x = 0x1.0p-24f;
+  float y = x;
+  float z = (0x1.000002p0f + y) + (-1.0f - y);
+
+  if (z == 0.0f)
+    return FE_DOWNWARD;
+  if (z == 0x1.0p-23f)
+    return FE_TOWARDZERO;
+  return (2.0f + y == 2.0f) ? FE_TONEAREST : FE_UPWARD;
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_ROUNDING_MODE_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/sqrt.h b/contrib/llvm-project/libc/src/__support/FPUtil/sqrt.h
new file mode 100644
index 000000000000..d4ed744b4010
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/sqrt.h
@@ -0,0 +1,65 @@
+//===-- Square root of IEEE 754 floating point numbers ----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_SQRT_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_SQRT_H
+
+#include "src/__support/macros/properties/architectures.h"
+#include "src/__support/macros/properties/cpu_features.h"
+
+#include "src/__support/FPUtil/generic/sqrt.h"
+
+// Generic instruction specializations with __builtin_elementwise_sqrt.
+#if defined(LIBC_TARGET_CPU_HAS_FPU_FLOAT) ||                                  \
+    defined(LIBC_TARGET_CPU_HAS_FPU_DOUBLE)
+
+#if __has_builtin(__builtin_elementwise_sqrt)
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+#ifdef LIBC_TARGET_CPU_HAS_FPU_FLOAT
+template <> LIBC_INLINE float sqrt<float>(float x) {
+  return __builtin_elementwise_sqrt(x);
+}
+#endif // LIBC_TARGET_CPU_HAS_FPU_FLOAT
+
+#ifdef LIBC_TARGET_CPU_HAS_FPU_DOUBLE
+template <> LIBC_INLINE double sqrt<double>(double x) {
+  return __builtin_elementwise_sqrt(x);
+}
+#endif // LIBC_TARGET_CPU_HAS_FPU_DOUBLE
+
+// Use 80-bit long double instruction on x86.
+// https://godbolt.org/z/oWEaj6hxK
+#ifdef LIBC_TYPES_LONG_DOUBLE_IS_X86_FLOAT80
+template <> LIBC_INLINE long double sqrt<long double>(long double x) {
+  return __builtin_elementwise_sqrt(x);
+}
+#endif // LIBC_TYPES_LONG_DOUBLE_IS_X86_FLOAT80
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#else // __builtin_elementwise_sqrt
+// Use inline assembly when __builtin_elementwise_sqrt is not available.
+#if defined(LIBC_TARGET_CPU_HAS_SSE2)
+#include "x86_64/sqrt.h"
+#elif defined(LIBC_TARGET_ARCH_IS_AARCH64) && defined(__ARM_FP)
+#include "aarch64/sqrt.h"
+#elif defined(LIBC_TARGET_ARCH_IS_ARM)
+#include "arm/sqrt.h"
+#elif defined(LIBC_TARGET_ARCH_IS_ANY_RISCV)
+#include "riscv/sqrt.h"
+#endif // Target specific header of inline asm.
+
+#endif // __builtin_elementwise_sqrt
+
+#endif // LIBC_TARGET_CPU_HAS_FPU_FLOAT or DOUBLE
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_SQRT_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/triple_double.h b/contrib/llvm-project/libc/src/__support/FPUtil/triple_double.h
new file mode 100644
index 000000000000..f3ac5404ca36
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/triple_double.h
@@ -0,0 +1,26 @@
+//===-- Utilities for triple-double data type. ------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_TRIPLE_DOUBLE_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_TRIPLE_DOUBLE_H
+
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+struct TripleDouble {
+  double lo = 0.0;
+  double mid = 0.0;
+  double hi = 0.0;
+};
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_TRIPLE_DOUBLE_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/x86_64/FEnvImpl.h b/contrib/llvm-project/libc/src/__support/FPUtil/x86_64/FEnvImpl.h
new file mode 100644
index 000000000000..560727c22978
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/x86_64/FEnvImpl.h
@@ -0,0 +1,651 @@
+//===-- x86_64 floating point env manipulation functions --------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_FENVIMPL_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_FENVIMPL_H
+
+#include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+
+#if !defined(LIBC_TARGET_ARCH_IS_X86)
+#error "Invalid include"
+#endif
+
+#include <stdint.h>
+
+#include "hdr/types/fenv_t.h"
+#include "src/__support/macros/sanitizer.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+namespace internal {
+
+// Normally, one should be able to define FE_* macros to the exact rounding mode
+// encodings. However, since we want LLVM libc to be compiled against headers
+// from other libcs, we cannot assume that FE_* macros are always defined in
+// such a manner. So, we will define enums corresponding to the x86_64 bit
+// encodings. The implementations can map from FE_* to the corresponding enum
+// values.
+
+// The rounding control values in the x87 control register and the MXCSR
+// register have the same 2-bit enoding but have different bit positions.
+// See below for the bit positions.
+struct RoundingControlValue {
+  static constexpr uint16_t TO_NEAREST = 0x0;
+  static constexpr uint16_t DOWNWARD = 0x1;
+  static constexpr uint16_t UPWARD = 0x2;
+  static constexpr uint16_t TOWARD_ZERO = 0x3;
+};
+
+static constexpr uint16_t X87_ROUNDING_CONTROL_BIT_POSITION = 10;
+static constexpr uint16_t MXCSR_ROUNDING_CONTROL_BIT_POSITION = 13;
+
+// The exception flags in the x87 status register and the MXCSR have the same
+// encoding as well as the same bit positions.
+struct ExceptionFlags {
+  static constexpr uint16_t INVALID_F = 0x1;
+  // Some libcs define __FE_DENORM corresponding to the denormal input
+  // exception and include it in FE_ALL_EXCEPTS. We define and use it to
+  // support compiling against headers provided by such libcs.
+  static constexpr uint16_t DENORMAL_F = 0x2;
+  static constexpr uint16_t DIV_BY_ZERO_F = 0x4;
+  static constexpr uint16_t OVERFLOW_F = 0x8;
+  static constexpr uint16_t UNDERFLOW_F = 0x10;
+  static constexpr uint16_t INEXACT_F = 0x20;
+};
+
+// The exception control bits occupy six bits, one bit for each exception.
+// In the x87 control word, they occupy the first 6 bits. In the MXCSR
+// register, they occupy bits 7 to 12.
+static constexpr uint16_t X87_EXCEPTION_CONTROL_BIT_POSITION = 0;
+static constexpr uint16_t X87_EXCEPTION_CONTROL_BIT_POSITION_HIGH = 24;
+static constexpr uint16_t MXCSR_EXCEPTION_CONTOL_BIT_POISTION = 7;
+
+// Exception flags are individual bits in the corresponding registers.
+// So, we just OR the bit values to get the full set of exceptions.
+LIBC_INLINE uint16_t get_status_value_for_except(int excepts) {
+  // We will make use of the fact that exception control bits are single
+  // bit flags in the control registers.
+  return ((excepts & FE_INVALID) ? ExceptionFlags::INVALID_F : 0) |
+#ifdef __FE_DENORM
+         ((excepts & __FE_DENORM) ? ExceptionFlags::DENORMAL_F : 0) |
+#endif // __FE_DENORM
+         ((excepts & FE_DIVBYZERO) ? ExceptionFlags::DIV_BY_ZERO_F : 0) |
+         ((excepts & FE_OVERFLOW) ? ExceptionFlags::OVERFLOW_F : 0) |
+         ((excepts & FE_UNDERFLOW) ? ExceptionFlags::UNDERFLOW_F : 0) |
+         ((excepts & FE_INEXACT) ? ExceptionFlags::INEXACT_F : 0);
+}
+
+LIBC_INLINE int exception_status_to_macro(uint16_t status) {
+  return ((status & ExceptionFlags::INVALID_F) ? FE_INVALID : 0) |
+#ifdef __FE_DENORM
+         ((status & ExceptionFlags::DENORMAL_F) ? __FE_DENORM : 0) |
+#endif // __FE_DENORM
+         ((status & ExceptionFlags::DIV_BY_ZERO_F) ? FE_DIVBYZERO : 0) |
+         ((status & ExceptionFlags::OVERFLOW_F) ? FE_OVERFLOW : 0) |
+         ((status & ExceptionFlags::UNDERFLOW_F) ? FE_UNDERFLOW : 0) |
+         ((status & ExceptionFlags::INEXACT_F) ? FE_INEXACT : 0);
+}
+
+struct X87StateDescriptor {
+  uint16_t control_word;
+  uint16_t unused1;
+  uint16_t status_word;
+  uint16_t unused2;
+  // TODO: Elaborate the remaining 20 bytes as required.
+  uint32_t _[5];
+};
+
+LIBC_INLINE uint16_t get_x87_control_word() {
+  uint16_t w;
+  __asm__ __volatile__("fnstcw %0" : "=m"(w)::);
+  MSAN_UNPOISON(&w, sizeof(w));
+  return w;
+}
+
+LIBC_INLINE void write_x87_control_word(uint16_t w) {
+  __asm__ __volatile__("fldcw %0" : : "m"(w) :);
+}
+
+LIBC_INLINE uint16_t get_x87_status_word() {
+  uint16_t w;
+  __asm__ __volatile__("fnstsw %0" : "=m"(w)::);
+  MSAN_UNPOISON(&w, sizeof(w));
+  return w;
+}
+
+LIBC_INLINE void clear_x87_exceptions() {
+  __asm__ __volatile__("fnclex" : : :);
+}
+
+LIBC_INLINE uint32_t get_mxcsr() {
+  uint32_t w;
+  __asm__ __volatile__("stmxcsr %0" : "=m"(w)::);
+  MSAN_UNPOISON(&w, sizeof(w));
+  return w;
+}
+
+LIBC_INLINE void write_mxcsr(uint32_t w) {
+  __asm__ __volatile__("ldmxcsr %0" : : "m"(w) :);
+}
+
+LIBC_INLINE void get_x87_state_descriptor(X87StateDescriptor &s) {
+  __asm__ __volatile__("fnstenv %0" : "=m"(s));
+  MSAN_UNPOISON(&s, sizeof(s));
+}
+
+LIBC_INLINE void write_x87_state_descriptor(const X87StateDescriptor &s) {
+  __asm__ __volatile__("fldenv %0" : : "m"(s) :);
+}
+
+LIBC_INLINE void fwait() { __asm__ __volatile__("fwait"); }
+
+} // namespace internal
+
+LIBC_INLINE int enable_except(int excepts) {
+  // In the x87 control word and in MXCSR, an exception is blocked
+  // if the corresponding bit is set. That is the reason for all the
+  // bit-flip operations below as we need to turn the bits to zero
+  // to enable them.
+
+  uint16_t bit_mask = internal::get_status_value_for_except(excepts);
+
+  uint16_t x87_cw = internal::get_x87_control_word();
+  uint16_t old_excepts = ~x87_cw & 0x3F; // Save previously enabled exceptions.
+  x87_cw &= ~bit_mask;
+  internal::write_x87_control_word(x87_cw);
+
+  // Enabling SSE exceptions via MXCSR is a nice thing to do but
+  // might not be of much use practically as SSE exceptions and the x87
+  // exceptions are independent of each other.
+  uint32_t mxcsr = internal::get_mxcsr();
+  mxcsr &= ~(bit_mask << internal::MXCSR_EXCEPTION_CONTOL_BIT_POISTION);
+  internal::write_mxcsr(mxcsr);
+
+  // Since the x87 exceptions and SSE exceptions are independent of each,
+  // it doesn't make much sence to report both in the return value. Most
+  // often, the standard floating point functions deal with FPU operations
+  // so we will retrun only the old x87 exceptions.
+  return internal::exception_status_to_macro(old_excepts);
+}
+
+LIBC_INLINE int disable_except(int excepts) {
+  // In the x87 control word and in MXCSR, an exception is blocked
+  // if the corresponding bit is set.
+
+  uint16_t bit_mask = internal::get_status_value_for_except(excepts);
+
+  uint16_t x87_cw = internal::get_x87_control_word();
+  uint16_t old_excepts = ~x87_cw & 0x3F; // Save previously enabled exceptions.
+  x87_cw |= bit_mask;
+  internal::write_x87_control_word(x87_cw);
+
+  // Just like in enable_except, it is not clear if disabling SSE exceptions
+  // is required. But, we will still do it only as a "nice thing to do".
+  uint32_t mxcsr = internal::get_mxcsr();
+  mxcsr |= (bit_mask << internal::MXCSR_EXCEPTION_CONTOL_BIT_POISTION);
+  internal::write_mxcsr(mxcsr);
+
+  return internal::exception_status_to_macro(old_excepts);
+}
+
+LIBC_INLINE int get_except() {
+  uint16_t mxcsr = static_cast<uint16_t>(internal::get_mxcsr());
+  uint16_t enabled_excepts = ~(mxcsr >> 7) & 0x3F;
+  return internal::exception_status_to_macro(enabled_excepts);
+}
+
+LIBC_INLINE int clear_except(int excepts) {
+  internal::X87StateDescriptor state;
+  internal::get_x87_state_descriptor(state);
+  state.status_word &=
+      static_cast<uint16_t>(~internal::get_status_value_for_except(excepts));
+  internal::write_x87_state_descriptor(state);
+
+  uint32_t mxcsr = internal::get_mxcsr();
+  mxcsr &= ~internal::get_status_value_for_except(excepts);
+  internal::write_mxcsr(mxcsr);
+  return 0;
+}
+
+LIBC_INLINE int test_except(int excepts) {
+  uint16_t status_word = internal::get_x87_status_word();
+  uint32_t mxcsr = internal::get_mxcsr();
+  // Check both x87 status word and MXCSR.
+  uint16_t status_value = internal::get_status_value_for_except(excepts);
+  return internal::exception_status_to_macro(
+      static_cast<uint16_t>(status_value & (status_word | mxcsr)));
+}
+
+// Sets the exception flags but does not trigger the exception handler.
+LIBC_INLINE int set_except(int excepts) {
+  uint16_t status_value = internal::get_status_value_for_except(excepts);
+  internal::X87StateDescriptor state;
+  internal::get_x87_state_descriptor(state);
+  state.status_word |= status_value;
+  internal::write_x87_state_descriptor(state);
+
+  uint32_t mxcsr = internal::get_mxcsr();
+  mxcsr |= status_value;
+  internal::write_mxcsr(mxcsr);
+
+  return 0;
+}
+
+template <bool SKIP_X87_FPU = false> LIBC_INLINE int raise_except(int excepts) {
+  uint16_t status_value = internal::get_status_value_for_except(excepts);
+
+  // We set the status flag for exception one at a time and call the
+  // fwait instruction to actually get the processor to raise the
+  // exception by calling the exception handler. This scheme is per
+  // the description in "8.6 X87 FPU EXCEPTION SYNCHRONIZATION"
+  // of the "Intel 64 and IA-32 Architectures Software Developer's
+  // Manual, Vol 1".
+
+  // FPU status word is read for each exception separately as the
+  // exception handler can potentially write to it (typically to clear
+  // the corresponding exception flag). By reading it separately, we
+  // ensure that the writes by the exception handler are maintained
+  // when raising the next exception.
+
+  auto raise_helper = [](uint16_t singleExceptFlag) {
+    if constexpr (!SKIP_X87_FPU) {
+      internal::X87StateDescriptor state;
+      internal::get_x87_state_descriptor(state);
+      state.status_word |= singleExceptFlag;
+      internal::write_x87_state_descriptor(state);
+    }
+
+    uint32_t mxcsr = 0;
+    mxcsr = internal::get_mxcsr();
+    mxcsr |= singleExceptFlag;
+    internal::write_mxcsr(mxcsr);
+    internal::fwait();
+  };
+
+  if (status_value & internal::ExceptionFlags::INVALID_F)
+    raise_helper(internal::ExceptionFlags::INVALID_F);
+  if (status_value & internal::ExceptionFlags::DIV_BY_ZERO_F)
+    raise_helper(internal::ExceptionFlags::DIV_BY_ZERO_F);
+  if (status_value & internal::ExceptionFlags::OVERFLOW_F)
+    raise_helper(internal::ExceptionFlags::OVERFLOW_F);
+  if (status_value & internal::ExceptionFlags::UNDERFLOW_F)
+    raise_helper(internal::ExceptionFlags::UNDERFLOW_F);
+  if (status_value & internal::ExceptionFlags::INEXACT_F)
+    raise_helper(internal::ExceptionFlags::INEXACT_F);
+#ifdef __FE_DENORM
+  if (status_value & internal::ExceptionFlags::DENORMAL_F) {
+    raise_helper(internal::ExceptionFlags::DENORMAL_F);
+  }
+#endif // __FE_DENORM
+
+  // There is no special synchronization scheme available to
+  // raise SEE exceptions. So, we will ignore that for now.
+  // Just plain writing to the MXCSR register does not guarantee
+  // the exception handler will be called.
+
+  return 0;
+}
+
+LIBC_INLINE int get_round() {
+  uint16_t bit_value =
+      (internal::get_mxcsr() >> internal::MXCSR_ROUNDING_CONTROL_BIT_POSITION) &
+      0x3;
+  switch (bit_value) {
+  case internal::RoundingControlValue::TO_NEAREST:
+    return FE_TONEAREST;
+  case internal::RoundingControlValue::DOWNWARD:
+    return FE_DOWNWARD;
+  case internal::RoundingControlValue::UPWARD:
+    return FE_UPWARD;
+  case internal::RoundingControlValue::TOWARD_ZERO:
+    return FE_TOWARDZERO;
+  default:
+    return -1; // Error value.
+  }
+}
+
+LIBC_INLINE int set_round(int mode) {
+  uint16_t bit_value;
+  switch (mode) {
+  case FE_TONEAREST:
+    bit_value = internal::RoundingControlValue::TO_NEAREST;
+    break;
+  case FE_DOWNWARD:
+    bit_value = internal::RoundingControlValue::DOWNWARD;
+    break;
+  case FE_UPWARD:
+    bit_value = internal::RoundingControlValue::UPWARD;
+    break;
+  case FE_TOWARDZERO:
+    bit_value = internal::RoundingControlValue::TOWARD_ZERO;
+    break;
+  default:
+    return 1; // To indicate failure
+  }
+
+  uint16_t x87_value = static_cast<uint16_t>(
+      bit_value << internal::X87_ROUNDING_CONTROL_BIT_POSITION);
+  uint16_t x87_control = internal::get_x87_control_word();
+  x87_control = static_cast<uint16_t>(
+      (x87_control &
+       ~(uint16_t(0x3) << internal::X87_ROUNDING_CONTROL_BIT_POSITION)) |
+      x87_value);
+  internal::write_x87_control_word(x87_control);
+
+  uint32_t mxcsr_value = bit_value
+                         << internal::MXCSR_ROUNDING_CONTROL_BIT_POSITION;
+  uint32_t mxcsr_control = internal::get_mxcsr();
+  mxcsr_control = (mxcsr_control &
+                   ~(0x3 << internal::MXCSR_ROUNDING_CONTROL_BIT_POSITION)) |
+                  mxcsr_value;
+  internal::write_mxcsr(mxcsr_control);
+
+  return 0;
+}
+
+namespace internal {
+
+#if defined(_WIN32)
+// MSVC fenv.h defines a very simple representation of the floating point state
+// which just consists of control and status words of the x87 unit.
+struct FPState {
+  uint32_t control_word;
+  uint32_t status_word;
+};
+#elif defined(__APPLE__)
+struct FPState {
+  uint16_t control_word;
+  uint16_t status_word;
+  uint32_t mxcsr;
+  uint8_t reserved[8];
+};
+#else
+struct FPState {
+  X87StateDescriptor x87_status;
+  uint32_t mxcsr;
+};
+#endif // _WIN32
+
+} // namespace internal
+
+static_assert(
+    sizeof(fenv_t) == sizeof(internal::FPState),
+    "Internal floating point state does not match the public fenv_t type.");
+
+#ifdef _WIN32
+
+// The exception flags in the Windows FEnv struct and the MXCSR have almost
+// reversed bit positions.
+struct WinExceptionFlags {
+  static constexpr uint32_t INEXACT_WIN = 0x01;
+  static constexpr uint32_t UNDERFLOW_WIN = 0x02;
+  static constexpr uint32_t OVERFLOW_WIN = 0x04;
+  static constexpr uint32_t DIV_BY_ZERO_WIN = 0x08;
+  static constexpr uint32_t INVALID_WIN = 0x10;
+  static constexpr uint32_t DENORMAL_WIN = 0x20;
+
+  // The Windows FEnv struct has a second copy of all of these bits in the high
+  // byte of the 32 bit control word. These are used as the source of truth when
+  // calling fesetenv.
+  static constexpr uint32_t HIGH_OFFSET = 24;
+
+  static constexpr uint32_t HIGH_INEXACT = INEXACT_WIN << HIGH_OFFSET;
+  static constexpr uint32_t HIGH_UNDERFLOW = UNDERFLOW_WIN << HIGH_OFFSET;
+  static constexpr uint32_t HIGH_OVERFLOW = OVERFLOW_WIN << HIGH_OFFSET;
+  static constexpr uint32_t HIGH_DIV_BY_ZERO = DIV_BY_ZERO_WIN << HIGH_OFFSET;
+  static constexpr uint32_t HIGH_INVALID = INVALID_WIN << HIGH_OFFSET;
+  static constexpr uint32_t HIGH_DENORMAL = DENORMAL_WIN << HIGH_OFFSET;
+};
+
+/*
+    fenv_t control word format:
+
+    Windows (at least for x64) uses a 4 byte control fenv control word stored in
+    a 32 bit integer. The first byte contains just the rounding mode and the
+    exception masks, while the last two bytes contain that same information as
+    well as the flush-to-zero and denormals-are-zero flags. The flags are
+    represented with a truth table:
+
+    00 - No flags set
+    01 - Flush-to-zero and Denormals-are-zero set
+    11 - Flush-to-zero set
+    10 - Denormals-are-zero set
+
+    U represents unused.
+
+     +-----Rounding Mode-----+
+     |                       |
+    ++                      ++
+    ||                      ||
+    RRMMMMMM UUUUUUUU UUUUFFRR UUMMMMMM
+      |    |              ||     |    |
+      +----+      flags---++     +----+
+           |                          |
+           +------Exception Masks-----+
+
+
+    fenv_t status word format:
+
+    The status word is a lot simpler for this conversion, since only the
+    exception flags are used in the MXCSR.
+
+      +----+---Exception Flags---+----+
+      |    |                     |    |
+    UUEEEEEE UUUUUUUU UUUUUUUU UUEEEEEE
+
+
+
+    MXCSR Format:
+
+    The MXCSR format is the same information, just organized differently. Since
+    the fenv_t struct for windows doesn't include the mxcsr bits, they must be
+    generated from the control word bits.
+
+      Exception Masks---+           +---Exception Flags
+                        |           |
+     Flush-to-zero---+  +----+ +----+
+                     |  |    | |    |
+                     FRRMMMMMMDEEEEEE
+                      ||      |
+                      ++      +---Denormals-are-zero
+                      |
+                      +---Rounding Mode
+
+
+    The mask and flag order is as follows:
+
+    fenv_t      mxcsr
+
+    denormal    inexact
+    invalid     underflow
+    div by 0    overflow
+    overflow    div by 0
+    underflow   denormal
+    inexact     invalid
+
+    This is almost reverse, except for denormal and invalid which are in the
+    same order in both.
+  */
+
+LIBC_INLINE int get_env(fenv_t *envp) {
+  internal::FPState *state = reinterpret_cast<internal::FPState *>(envp);
+
+  uint32_t status_word = 0;
+  uint32_t control_word = 0;
+
+  uint32_t mxcsr = internal::get_mxcsr();
+
+  // Set exception flags in the status word
+  status_word |= (mxcsr & (internal::ExceptionFlags::INVALID_F |
+                           internal::ExceptionFlags::DENORMAL_F))
+                 << 4;
+  status_word |= (mxcsr & internal::ExceptionFlags::DIV_BY_ZERO_F) << 1;
+  status_word |= (mxcsr & internal::ExceptionFlags::OVERFLOW_F) >> 1;
+  status_word |= (mxcsr & internal::ExceptionFlags::UNDERFLOW_F) >> 3;
+  status_word |= (mxcsr & internal::ExceptionFlags::INEXACT_F) >> 5;
+  status_word |= status_word << WinExceptionFlags::HIGH_OFFSET;
+
+  // Set exception masks in bits 0-5 and 24-29
+  control_word |= (mxcsr & ((internal::ExceptionFlags::INVALID_F |
+                             internal::ExceptionFlags::DENORMAL_F)
+                            << 7)) >>
+                  3;
+  control_word |= (mxcsr & (internal::ExceptionFlags::DIV_BY_ZERO_F << 7)) >> 6;
+  control_word |= (mxcsr & (internal::ExceptionFlags::OVERFLOW_F << 7)) >> 8;
+  control_word |= (mxcsr & (internal::ExceptionFlags::UNDERFLOW_F << 7)) >> 10;
+  control_word |= (mxcsr & (internal::ExceptionFlags::INEXACT_F << 7)) >> 12;
+  control_word |= control_word << WinExceptionFlags::HIGH_OFFSET;
+
+  // Set rounding in bits 8-9 and 30-31
+  control_word |= (mxcsr & 0x6000) >> 5;
+  control_word |= (mxcsr & 0x6000) << 17;
+
+  // Set flush-to-zero in bit 10
+  control_word |= (mxcsr & 0x8000) >> 5;
+
+  // Set denormals-are-zero xor flush-to-zero in bit 11
+  control_word |= (((mxcsr & 0x8000) >> 9) ^ (mxcsr & 0x0040)) << 5;
+
+  state->control_word = control_word;
+  state->status_word = status_word;
+  return 0;
+}
+
+LIBC_INLINE int set_env(const fenv_t *envp) {
+  const internal::FPState *state =
+      reinterpret_cast<const internal::FPState *>(envp);
+
+  uint32_t mxcsr = 0;
+
+  // Set exception flags from the status word
+  mxcsr |= static_cast<uint16_t>(
+      (state->status_word &
+       (WinExceptionFlags::HIGH_DENORMAL | WinExceptionFlags::HIGH_INVALID)) >>
+      28);
+  mxcsr |= static_cast<uint16_t>(
+      (state->status_word & WinExceptionFlags::HIGH_DIV_BY_ZERO) >> 25);
+  mxcsr |= static_cast<uint16_t>(
+      (state->status_word & WinExceptionFlags::HIGH_OVERFLOW) >> 23);
+  mxcsr |= static_cast<uint16_t>(
+      (state->status_word & WinExceptionFlags::HIGH_UNDERFLOW) >> 21);
+  mxcsr |= static_cast<uint16_t>(
+      (state->status_word & WinExceptionFlags::HIGH_INEXACT) >> 19);
+
+  // Set denormals-are-zero from bit 10 xor bit 11
+  mxcsr |= static_cast<uint16_t>(
+      (((state->control_word & 0x800) >> 1) ^ (state->control_word & 0x400)) >>
+      4);
+
+  // Set exception masks from bits 24-29
+  mxcsr |= static_cast<uint16_t>(
+      (state->control_word &
+       (WinExceptionFlags::HIGH_DENORMAL | WinExceptionFlags::HIGH_INVALID)) >>
+      21);
+  mxcsr |= static_cast<uint16_t>(
+      (state->control_word & WinExceptionFlags::HIGH_DIV_BY_ZERO) >> 18);
+  mxcsr |= static_cast<uint16_t>(
+      (state->control_word & WinExceptionFlags::HIGH_OVERFLOW) >> 16);
+  mxcsr |= static_cast<uint16_t>(
+      (state->control_word & WinExceptionFlags::HIGH_UNDERFLOW) >> 14);
+  mxcsr |= static_cast<uint16_t>(
+      (state->control_word & WinExceptionFlags::HIGH_INEXACT) >> 12);
+
+  // Set rounding from bits 30-31
+  mxcsr |= static_cast<uint16_t>((state->control_word & 0xc0000000) >> 17);
+
+  // Set flush-to-zero from bit 10
+  mxcsr |= static_cast<uint16_t>((state->control_word & 0x400) << 5);
+
+  internal::write_mxcsr(mxcsr);
+  return 0;
+}
+#else
+LIBC_INLINE int get_env(fenv_t *envp) {
+  internal::FPState *state = reinterpret_cast<internal::FPState *>(envp);
+#ifdef __APPLE__
+  internal::X87StateDescriptor x87_status;
+  internal::get_x87_state_descriptor(x87_status);
+  state->control_word = x87_status.control_word;
+  state->status_word = x87_status.status_word;
+#else
+  internal::get_x87_state_descriptor(state->x87_status);
+#endif // __APPLE__
+  state->mxcsr = internal::get_mxcsr();
+  return 0;
+}
+
+LIBC_INLINE int set_env(const fenv_t *envp) {
+  // envp contains everything including pieces like the current
+  // top of FPU stack. We cannot arbitrarily change them. So, we first
+  // read the current status and update only those pieces which are
+  // not disruptive.
+  internal::X87StateDescriptor x87_status;
+  internal::get_x87_state_descriptor(x87_status);
+
+  if (envp == FE_DFL_ENV) {
+    // Reset the exception flags in the status word.
+    x87_status.status_word &= ~uint16_t(0x3F);
+    // Reset other non-sensitive parts of the status word.
+    for (int i = 0; i < 5; i++)
+      x87_status._[i] = 0;
+    // In the control word, we do the following:
+    // 1. Mask all exceptions
+    // 2. Set rounding mode to round-to-nearest
+    // 3. Set the internal precision to double extended precision.
+    x87_status.control_word |= uint16_t(0x3F);         // Mask all exceptions.
+    x87_status.control_word &= ~(uint16_t(0x3) << 10); // Round to nearest.
+    x87_status.control_word |= (uint16_t(0x3) << 8);   // Extended precision.
+    internal::write_x87_state_descriptor(x87_status);
+
+    // We take the exact same approach MXCSR register as well.
+    // MXCSR has two additional fields, "flush-to-zero" and
+    // "denormals-are-zero". We reset those bits. Also, MXCSR does not
+    // have a field which controls the precision of internal operations.
+    uint32_t mxcsr = internal::get_mxcsr();
+    mxcsr &= ~uint16_t(0x3F);        // Clear exception flags.
+    mxcsr &= ~(uint16_t(0x1) << 6);  // Reset denormals-are-zero
+    mxcsr |= (uint16_t(0x3F) << 7);  // Mask exceptions
+    mxcsr &= ~(uint16_t(0x3) << 13); // Round to nearest.
+    mxcsr &= ~(uint16_t(0x1) << 15); // Reset flush-to-zero
+    internal::write_mxcsr(mxcsr);
+
+    return 0;
+  }
+
+  const internal::FPState *fpstate =
+      reinterpret_cast<const internal::FPState *>(envp);
+
+  // Copy the exception status flags from envp.
+  x87_status.status_word &= ~uint16_t(0x3F);
+#ifdef __APPLE__
+  x87_status.status_word |= (fpstate->status_word & 0x3F);
+  // We can set the x87 control word as is as there no sensitive bits.
+  x87_status.control_word = fpstate->control_word;
+#else
+  x87_status.status_word |= (fpstate->x87_status.status_word & 0x3F);
+  // Copy other non-sensitive parts of the status word.
+  for (int i = 0; i < 5; i++)
+    x87_status._[i] = fpstate->x87_status._[i];
+  // We can set the x87 control word as is as there no sensitive bits.
+  x87_status.control_word = fpstate->x87_status.control_word;
+#endif // __APPLE__
+  internal::write_x87_state_descriptor(x87_status);
+
+  // We can write the MXCSR state as is as there are no sensitive bits.
+  internal::write_mxcsr(fpstate->mxcsr);
+  return 0;
+}
+#endif
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_FENVIMPL_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/x86_64/NextAfterLongDouble.h b/contrib/llvm-project/libc/src/__support/FPUtil/x86_64/NextAfterLongDouble.h
new file mode 100644
index 000000000000..2e6b297ae934
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/x86_64/NextAfterLongDouble.h
@@ -0,0 +1,125 @@
+//===-- nextafter implementation for x86 long double numbers ----*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_NEXTAFTERLONGDOUBLE_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_NEXTAFTERLONGDOUBLE_H
+
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+
+#if !defined(LIBC_TARGET_ARCH_IS_X86)
+#error "Invalid include"
+#endif
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/FPUtil/FEnvImpl.h"
+#include "src/__support/FPUtil/FPBits.h"
+
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+LIBC_INLINE long double nextafter(long double from, long double to) {
+  using FPBits = FPBits<long double>;
+  FPBits from_bits(from);
+  if (from_bits.is_nan())
+    return from;
+
+  FPBits to_bits(to);
+  if (to_bits.is_nan())
+    return to;
+
+  if (from == to)
+    return to;
+
+  // Convert pseudo subnormal number to normal number.
+  if (from_bits.get_implicit_bit() == 1 && from_bits.is_subnormal()) {
+    from_bits.set_biased_exponent(1);
+  }
+
+  using StorageType = FPBits::StorageType;
+
+  constexpr StorageType FRACTION_MASK = FPBits::FRACTION_MASK;
+  // StorageType int_val = from_bits.uintval();
+  if (from == 0.0l) { // +0.0 / -0.0
+    from_bits = FPBits::min_subnormal(from > to ? Sign::NEG : Sign::POS);
+  } else if (from < 0.0l) {
+    if (to < from) { // toward -inf
+      if (from_bits == FPBits::max_subnormal(Sign::NEG)) {
+        // We deal with normal/subnormal boundary separately to avoid
+        // dealing with the implicit bit.
+        from_bits = FPBits::min_normal(Sign::NEG);
+      } else if (from_bits.get_mantissa() == FRACTION_MASK) {
+        from_bits.set_mantissa(0);
+        // Incrementing exponent might overflow the value to infinity,
+        // which is what is expected. Since NaNs are handling separately,
+        // it will never overflow "beyond" infinity.
+        from_bits.set_biased_exponent(from_bits.get_biased_exponent() + 1);
+        if (from_bits.is_inf())
+          raise_except_if_required(FE_OVERFLOW | FE_INEXACT);
+        return from_bits.get_val();
+      } else {
+        from_bits = FPBits(StorageType(from_bits.uintval() + 1));
+      }
+    } else { // toward +inf
+      if (from_bits == FPBits::min_normal(Sign::NEG)) {
+        // We deal with normal/subnormal boundary separately to avoid
+        // dealing with the implicit bit.
+        from_bits = FPBits::max_subnormal(Sign::NEG);
+      } else if (from_bits.get_mantissa() == 0) {
+        from_bits.set_mantissa(FRACTION_MASK);
+        // from == 0 is handled separately so decrementing the exponent will not
+        // lead to underflow.
+        from_bits.set_biased_exponent(from_bits.get_biased_exponent() - 1);
+        return from_bits.get_val();
+      } else {
+        from_bits = FPBits(StorageType(from_bits.uintval() - 1));
+      }
+    }
+  } else {
+    if (to < from) { // toward -inf
+      if (from_bits == FPBits::min_normal(Sign::POS)) {
+        from_bits = FPBits::max_subnormal(Sign::POS);
+      } else if (from_bits.get_mantissa() == 0) {
+        from_bits.set_mantissa(FRACTION_MASK);
+        // from == 0 is handled separately so decrementing the exponent will not
+        // lead to underflow.
+        from_bits.set_biased_exponent(from_bits.get_biased_exponent() - 1);
+        return from_bits.get_val();
+      } else {
+        from_bits = FPBits(StorageType(from_bits.uintval() - 1));
+      }
+    } else { // toward +inf
+      if (from_bits == FPBits::max_subnormal(Sign::POS)) {
+        from_bits = FPBits::min_normal(Sign::POS);
+      } else if (from_bits.get_mantissa() == FRACTION_MASK) {
+        from_bits.set_mantissa(0);
+        // Incrementing exponent might overflow the value to infinity,
+        // which is what is expected. Since NaNs are handling separately,
+        // it will never overflow "beyond" infinity.
+        from_bits.set_biased_exponent(from_bits.get_biased_exponent() + 1);
+        if (from_bits.is_inf())
+          raise_except_if_required(FE_OVERFLOW | FE_INEXACT);
+        return from_bits.get_val();
+      } else {
+        from_bits = FPBits(StorageType(from_bits.uintval() + 1));
+      }
+    }
+  }
+
+  if (!from_bits.get_implicit_bit())
+    raise_except_if_required(FE_UNDERFLOW | FE_INEXACT);
+
+  return from_bits.get_val();
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_NEXTAFTERLONGDOUBLE_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/x86_64/NextUpDownLongDouble.h b/contrib/llvm-project/libc/src/__support/FPUtil/x86_64/NextUpDownLongDouble.h
new file mode 100644
index 000000000000..31869975ac5a
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/x86_64/NextUpDownLongDouble.h
@@ -0,0 +1,63 @@
+//===-- nextupdown implementation for x86 long double numbers ---*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_NEXTUPDOWNLONGDOUBLE_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_NEXTUPDOWNLONGDOUBLE_H
+
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+
+#if !defined(LIBC_TARGET_ARCH_IS_X86)
+#error "Invalid include"
+#endif
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+template <bool IsDown>
+LIBC_INLINE constexpr long double nextupdown(long double x) {
+  constexpr Sign sign = IsDown ? Sign::NEG : Sign::POS;
+
+  using FPBits_t = FPBits<long double>;
+  FPBits_t xbits(x);
+  if (xbits.is_nan() || xbits == FPBits_t::max_normal(sign) ||
+      xbits == FPBits_t::inf(sign))
+    return x;
+
+  if (x == 0.0l)
+    return FPBits_t::min_subnormal(sign).get_val();
+
+  using StorageType = typename FPBits_t::StorageType;
+
+  if (xbits.sign() == sign) {
+    if (xbits.get_mantissa() == FPBits_t::FRACTION_MASK) {
+      xbits.set_mantissa(0);
+      xbits.set_biased_exponent(xbits.get_biased_exponent() + 1);
+    } else {
+      xbits = FPBits_t(StorageType(xbits.uintval() + 1));
+    }
+
+    return xbits.get_val();
+  }
+
+  if (xbits.get_mantissa() == 0) {
+    xbits.set_mantissa(FPBits_t::FRACTION_MASK);
+    xbits.set_biased_exponent(xbits.get_biased_exponent() - 1);
+  } else {
+    xbits = FPBits_t(StorageType(xbits.uintval() - 1));
+  }
+
+  return xbits.get_val();
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_NEXTUPDOWNLONGDOUBLE_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/x86_64/nearest_integer.h b/contrib/llvm-project/libc/src/__support/FPUtil/x86_64/nearest_integer.h
new file mode 100644
index 000000000000..4eae5ffe816b
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/x86_64/nearest_integer.h
@@ -0,0 +1,46 @@
+//===--- Round floating point to nearest integer on x86-64 ------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_NEAREST_INTEGER_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_NEAREST_INTEGER_H
+
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+
+#if !defined(LIBC_TARGET_ARCH_IS_X86_64)
+#error "Invalid include"
+#endif
+
+#if !defined(__SSE4_2__)
+#error "SSE4.2 instruction set is not supported"
+#endif
+
+#include <immintrin.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+LIBC_INLINE float nearest_integer(float x) {
+  __m128 xmm = _mm_set_ss(x); // NOLINT
+  __m128 ymm =
+      _mm_round_ss(xmm, xmm, _MM_ROUND_NEAREST | _MM_FROUND_NO_EXC); // NOLINT
+  return ymm[0];
+}
+
+LIBC_INLINE double nearest_integer(double x) {
+  __m128d xmm = _mm_set_sd(x); // NOLINT
+  __m128d ymm =
+      _mm_round_sd(xmm, xmm, _MM_ROUND_NEAREST | _MM_FROUND_NO_EXC); // NOLINT
+  return ymm[0];
+}
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_NEAREST_INTEGER_H
diff --git a/contrib/llvm-project/libc/src/__support/FPUtil/x86_64/sqrt.h b/contrib/llvm-project/libc/src/__support/FPUtil/x86_64/sqrt.h
new file mode 100644
index 000000000000..e10447751d21
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/FPUtil/x86_64/sqrt.h
@@ -0,0 +1,54 @@
+//===-- Square root of IEEE 754 floating point numbers ----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_SQRT_H
+#define LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_SQRT_H
+
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+#include "src/__support/macros/properties/cpu_features.h"
+
+#if !(defined(LIBC_TARGET_ARCH_IS_X86_64) && defined(LIBC_TARGET_CPU_HAS_SSE2))
+#error "sqrtss / sqrtsd need SSE2"
+#endif
+
+#include "src/__support/FPUtil/generic/sqrt.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+
+template <> LIBC_INLINE float sqrt<float>(float x) {
+  float result;
+  __asm__ __volatile__("sqrtss %x1, %x0" : "=x"(result) : "x"(x));
+  return result;
+}
+
+template <> LIBC_INLINE double sqrt<double>(double x) {
+  double result;
+  __asm__ __volatile__("sqrtsd %x1, %x0" : "=x"(result) : "x"(x));
+  return result;
+}
+
+#ifdef LIBC_TYPES_LONG_DOUBLE_IS_FLOAT64
+template <> LIBC_INLINE long double sqrt<long double>(long double x) {
+  long double result;
+  __asm__ __volatile__("sqrtsd %x1, %x0" : "=x"(result) : "x"(x));
+  return result;
+}
+#else
+template <> LIBC_INLINE long double sqrt<long double>(long double x) {
+  __asm__ __volatile__("fsqrt" : "+t"(x));
+  return x;
+}
+#endif
+
+} // namespace fputil
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_SQRT_H
diff --git a/contrib/llvm-project/libc/src/__support/File/dir.cpp b/contrib/llvm-project/libc/src/__support/File/dir.cpp
new file mode 100644
index 000000000000..aea8862c15f7
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/File/dir.cpp
@@ -0,0 +1,65 @@
+//===--- Implementation of a platform independent Dir data structure ------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "dir.h"
+
+#include "src/__support/CPP/mutex.h" // lock_guard
+#include "src/__support/CPP/new.h"
+#include "src/__support/error_or.h"
+#include "src/__support/libc_errno.h" // For error macros
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+ErrorOr<Dir *> Dir::open(const char *path) {
+  auto fd = platform_opendir(path);
+  if (!fd)
+    return LIBC_NAMESPACE::Error(fd.error());
+
+  LIBC_NAMESPACE::AllocChecker ac;
+  Dir *dir = new (ac) Dir(fd.value());
+  if (!ac)
+    return LIBC_NAMESPACE::Error(ENOMEM);
+  return dir;
+}
+
+ErrorOr<struct ::dirent *> Dir::read() {
+  cpp::lock_guard lock(mutex);
+  if (readptr >= fillsize) {
+    auto readsize = platform_fetch_dirents(fd, buffer);
+    if (!readsize)
+      return LIBC_NAMESPACE::Error(readsize.error());
+    fillsize = readsize.value();
+    readptr = 0;
+  }
+  if (fillsize == 0)
+    return nullptr;
+
+  struct ::dirent *d = reinterpret_cast<struct ::dirent *>(buffer + readptr);
+#ifdef __linux__
+  // The d_reclen field is available on Linux but not required by POSIX.
+  readptr += d->d_reclen;
+#else
+  // Other platforms have to implement how the read pointer is to be updated.
+#error "DIR read pointer update is missing."
+#endif
+  return d;
+}
+
+int Dir::close() {
+  {
+    cpp::lock_guard lock(mutex);
+    int retval = platform_closedir(fd);
+    if (retval != 0)
+      return retval;
+  }
+  delete this;
+  return 0;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/File/dir.h b/contrib/llvm-project/libc/src/__support/File/dir.h
new file mode 100644
index 000000000000..247ac1225cee
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/File/dir.h
@@ -0,0 +1,79 @@
+//===--- A platform independent Dir class ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FILE_DIR_H
+#define LLVM_LIBC_SRC___SUPPORT_FILE_DIR_H
+
+#include "src/__support/CPP/span.h"
+#include "src/__support/error_or.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/threads/mutex.h"
+
+#include <dirent.h>
+
+namespace LIBC_NAMESPACE_DECL {
+
+// Platform specific function which will open the directory |name|
+// and return its file descriptor. Upon failure, the error value is returned.
+ErrorOr<int> platform_opendir(const char *name);
+
+// Platform specific function which will close the directory with
+// file descriptor |fd|. Returns 0 on success, or the error number on failure.
+int platform_closedir(int fd);
+
+// Platform specific function which will fetch dirents in to buffer.
+// Returns the number of bytes written into buffer or the error number on
+// failure.
+ErrorOr<size_t> platform_fetch_dirents(int fd, cpp::span<uint8_t> buffer);
+
+// This class is designed to allow implementation of the POSIX dirent.h API.
+// By itself, it is platform independent but calls platform specific
+// functions to perform OS operations.
+class Dir {
+  static constexpr size_t BUFSIZE = 1024;
+  int fd;
+  size_t readptr = 0;  // The current read pointer.
+  size_t fillsize = 0; // The number of valid bytes availabe in the buffer.
+
+  // This is a buffer of struct dirent values which will be fetched
+  // from the OS. Since the d_name of struct dirent can be of a variable
+  // size, we store the data in a byte array.
+  uint8_t buffer[BUFSIZE];
+
+  Mutex mutex;
+
+  // A directory is to be opened by the static method open and closed
+  // by the close method. So, all constructors and destructor are declared
+  // as private. Inappropriate constructors are declared as deleted.
+  LIBC_INLINE Dir() = delete;
+  LIBC_INLINE Dir(const Dir &) = delete;
+
+  LIBC_INLINE explicit Dir(int fdesc)
+      : fd(fdesc), readptr(0), fillsize(0),
+        mutex(/*timed=*/false, /*recursive=*/false, /*robust=*/false,
+              /*pshared=*/false) {}
+  LIBC_INLINE ~Dir() = default;
+
+  LIBC_INLINE Dir &operator=(const Dir &) = delete;
+
+public:
+  static ErrorOr<Dir *> open(const char *path);
+
+  ErrorOr<struct ::dirent *> read();
+
+  // Returns 0 on success or the error number on failure. If an error number
+  // was returned, then the resources associated with the directory are not
+  // cleaned up.
+  int close();
+
+  LIBC_INLINE int getfd() { return fd; }
+};
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FILE_DIR_H
diff --git a/contrib/llvm-project/libc/src/__support/File/file.cpp b/contrib/llvm-project/libc/src/__support/File/file.cpp
new file mode 100644
index 000000000000..303852dbbb71
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/File/file.cpp
@@ -0,0 +1,477 @@
+//===--- Implementation of a platform independent file data structure -----===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "file.h"
+
+#include "hdr/func/realloc.h"
+#include "hdr/stdio_macros.h"
+#include "hdr/types/off_t.h"
+#include "src/__support/CPP/new.h"
+#include "src/__support/CPP/span.h"
+#include "src/__support/libc_errno.h" // For error macros
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+FileIOResult File::write_unlocked(const void *data, size_t len) {
+  if (!write_allowed()) {
+    err = true;
+    return {0, EBADF};
+  }
+
+  prev_op = FileOp::WRITE;
+
+  if (bufmode == _IONBF) { // unbuffered.
+    size_t ret_val =
+        write_unlocked_nbf(static_cast<const uint8_t *>(data), len);
+    flush_unlocked();
+    return ret_val;
+  } else if (bufmode == _IOFBF) { // fully buffered
+    return write_unlocked_fbf(static_cast<const uint8_t *>(data), len);
+  } else /*if (bufmode == _IOLBF) */ { // line buffered
+    return write_unlocked_lbf(static_cast<const uint8_t *>(data), len);
+  }
+}
+
+FileIOResult File::write_unlocked_nbf(const uint8_t *data, size_t len) {
+  if (pos > 0) { // If the buffer is not empty
+    // Flush the buffer
+    const size_t write_size = pos;
+    FileIOResult write_result = platform_write(this, buf, write_size);
+    pos = 0; // Buffer is now empty so reset pos to the beginning.
+    // If less bytes were written than expected, then an error occurred.
+    if (write_result < write_size) {
+      err = true;
+      // No bytes from data were written, so return 0.
+      return {0, write_result.error};
+    }
+  }
+
+  FileIOResult write_result = platform_write(this, data, len);
+  if (write_result < len)
+    err = true;
+  return write_result;
+}
+
+FileIOResult File::write_unlocked_fbf(const uint8_t *data, size_t len) {
+  const size_t init_pos = pos;
+  const size_t bufspace = bufsize - pos;
+
+  // If data is too large to be buffered at all, then just write it unbuffered.
+  if (len > bufspace + bufsize)
+    return write_unlocked_nbf(data, len);
+
+  // we split |data| (conceptually) using the split point. Then we handle the
+  // two pieces separately.
+  const size_t split_point = len < bufspace ? len : bufspace;
+
+  // The primary piece is the piece of |data| we want to write to the buffer
+  // before flushing. It will always fit into the buffer, since the split point
+  // is defined as being min(len, bufspace), and it will always exist if len is
+  // non-zero.
+  cpp::span<const uint8_t> primary(data, split_point);
+
+  // The second piece is the remainder of |data|. It is written to the buffer if
+  // it fits, or written directly to the output if it doesn't. If the primary
+  // piece fits entirely in the buffer, the remainder may be nothing.
+  cpp::span<const uint8_t> remainder(
+      static_cast<const uint8_t *>(data) + split_point, len - split_point);
+
+  cpp::span<uint8_t> bufref(static_cast<uint8_t *>(buf), bufsize);
+
+  // Copy the first piece into the buffer.
+  // TODO: Replace the for loop below with a call to internal memcpy.
+  for (size_t i = 0; i < primary.size(); ++i)
+    bufref[pos + i] = primary[i];
+  pos += primary.size();
+
+  // If there is no remainder, we can return early, since the first piece has
+  // fit completely into the buffer.
+  if (remainder.size() == 0)
+    return len;
+
+  // We need to flush the buffer now, since there is still data and the buffer
+  // is full.
+  const size_t write_size = pos;
+
+  FileIOResult buf_result = platform_write(this, buf, write_size);
+  size_t bytes_written = buf_result.value;
+
+  pos = 0; // Buffer is now empty so reset pos to the beginning.
+  // If less bytes were written than expected, then an error occurred. Return
+  // the number of bytes that have been written from |data|.
+  if (buf_result.has_error() || bytes_written < write_size) {
+    err = true;
+    return {bytes_written <= init_pos ? 0 : bytes_written - init_pos,
+            buf_result.error};
+  }
+
+  // The second piece is handled basically the same as the first, although we
+  // know that if the second piece has data in it then the buffer has been
+  // flushed, meaning that pos is always 0.
+  if (remainder.size() < bufsize) {
+    // TODO: Replace the for loop below with a call to internal memcpy.
+    for (size_t i = 0; i < remainder.size(); ++i)
+      bufref[i] = remainder[i];
+    pos = remainder.size();
+  } else {
+
+    FileIOResult result =
+        platform_write(this, remainder.data(), remainder.size());
+    size_t bytes_written = buf_result.value;
+
+    // If less bytes were written than expected, then an error occurred. Return
+    // the number of bytes that have been written from |data|.
+    if (result.has_error() || bytes_written < remainder.size()) {
+      err = true;
+      return {primary.size() + bytes_written, result.error};
+    }
+  }
+
+  return len;
+}
+
+FileIOResult File::write_unlocked_lbf(const uint8_t *data, size_t len) {
+  constexpr uint8_t NEWLINE_CHAR = '\n';
+  size_t last_newline = len;
+  for (size_t i = len; i >= 1; --i) {
+    if (data[i - 1] == NEWLINE_CHAR) {
+      last_newline = i - 1;
+      break;
+    }
+  }
+
+  // If there is no newline, treat this as fully buffered.
+  if (last_newline == len) {
+    return write_unlocked_fbf(data, len);
+  }
+
+  // we split |data| (conceptually) using the split point. Then we handle the
+  // two pieces separately.
+  const size_t split_point = last_newline + 1;
+
+  // The primary piece is everything in |data| up to the newline. It's written
+  // unbuffered to the output.
+  cpp::span<const uint8_t> primary(data, split_point);
+
+  // The second piece is the remainder of |data|. It is written fully buffered,
+  // meaning it may stay in the buffer if it fits.
+  cpp::span<const uint8_t> remainder(
+      static_cast<const uint8_t *>(data) + split_point, len - split_point);
+
+  size_t written = 0;
+
+  written = write_unlocked_nbf(primary.data(), primary.size());
+  if (written < primary.size()) {
+    err = true;
+    return written;
+  }
+
+  flush_unlocked();
+
+  written += write_unlocked_fbf(remainder.data(), remainder.size());
+  if (written < len) {
+    err = true;
+    return written;
+  }
+
+  return len;
+}
+
+FileIOResult File::read_unlocked(void *data, size_t len) {
+  if (!read_allowed()) {
+    err = true;
+    return {0, EBADF};
+  }
+
+  prev_op = FileOp::READ;
+
+  if (bufmode == _IONBF) { // unbuffered.
+    return read_unlocked_nbf(static_cast<uint8_t *>(data), len);
+  } else if (bufmode == _IOFBF) { // fully buffered
+    return read_unlocked_fbf(static_cast<uint8_t *>(data), len);
+  } else /*if (bufmode == _IOLBF) */ { // line buffered
+    // There is no line buffered mode for read. Use fully buffered instead.
+    return read_unlocked_fbf(static_cast<uint8_t *>(data), len);
+  }
+}
+
+size_t File::copy_data_from_buf(uint8_t *data, size_t len) {
+  cpp::span<uint8_t> bufref(static_cast<uint8_t *>(buf), bufsize);
+  cpp::span<uint8_t> dataref(static_cast<uint8_t *>(data), len);
+
+  // Because read_limit is always greater than equal to pos,
+  // available_data is never a wrapped around value.
+  size_t available_data = read_limit - pos;
+  if (len <= available_data) {
+    // TODO: Replace the for loop below with a call to internal memcpy.
+    for (size_t i = 0; i < len; ++i)
+      dataref[i] = bufref[i + pos];
+    pos += len;
+    return len;
+  }
+
+  // Copy all of the available data.
+  // TODO: Replace the for loop with a call to internal memcpy.
+  for (size_t i = 0; i < available_data; ++i)
+    dataref[i] = bufref[i + pos];
+  read_limit = pos = 0; // Reset the pointers.
+
+  return available_data;
+}
+
+FileIOResult File::read_unlocked_fbf(uint8_t *data, size_t len) {
+  // Read data from the buffer first.
+  size_t available_data = copy_data_from_buf(data, len);
+  if (available_data == len)
+    return available_data;
+
+  // Update the dataref to reflect that fact that we have already
+  // copied |available_data| into |data|.
+  size_t to_fetch = len - available_data;
+  cpp::span<uint8_t> dataref(static_cast<uint8_t *>(data) + available_data,
+                             to_fetch);
+
+  if (to_fetch > bufsize) {
+    FileIOResult result = platform_read(this, dataref.data(), to_fetch);
+    size_t fetched_size = result.value;
+    if (result.has_error() || fetched_size < to_fetch) {
+      if (!result.has_error())
+        eof = true;
+      else
+        err = true;
+      return {available_data + fetched_size, result.error};
+    }
+    return len;
+  }
+
+  // Fetch and buffer another buffer worth of data.
+  FileIOResult result = platform_read(this, buf, bufsize);
+  size_t fetched_size = result.value;
+  read_limit += fetched_size;
+  size_t transfer_size = fetched_size >= to_fetch ? to_fetch : fetched_size;
+  for (size_t i = 0; i < transfer_size; ++i)
+    dataref[i] = buf[i];
+  pos += transfer_size;
+  if (result.has_error() || fetched_size < to_fetch) {
+    if (!result.has_error())
+      eof = true;
+    else
+      err = true;
+  }
+  return {transfer_size + available_data, result.error};
+}
+
+FileIOResult File::read_unlocked_nbf(uint8_t *data, size_t len) {
+  // Check whether there is a character in the ungetc buffer.
+  size_t available_data = copy_data_from_buf(data, len);
+  if (available_data == len)
+    return available_data;
+
+  // Directly copy the data into |data|.
+  cpp::span<uint8_t> dataref(static_cast<uint8_t *>(data) + available_data,
+                             len - available_data);
+  FileIOResult result = platform_read(this, dataref.data(), dataref.size());
+
+  if (result.has_error() || result < dataref.size()) {
+    if (!result.has_error())
+      eof = true;
+    else
+      err = true;
+  }
+  return {result + available_data, result.error};
+}
+
+int File::ungetc_unlocked(int c) {
+  // There is no meaning to unget if:
+  // 1. You are trying to push back EOF.
+  // 2. Read operations are not allowed on this file.
+  // 3. The previous operation was a write operation.
+  if (c == EOF || !read_allowed() || (prev_op == FileOp::WRITE))
+    return EOF;
+
+  cpp::span<uint8_t> bufref(static_cast<uint8_t *>(buf), bufsize);
+  if (read_limit == 0) {
+    // If |read_limit| is zero, it can mean three things:
+    //   a. This file was just created.
+    //   b. The previous operation was a seek operation.
+    //   c. The previous operation was a read operation which emptied
+    //      the buffer.
+    // For all the above cases, we simply write |c| at the beginning
+    // of the buffer and bump |read_limit|. Note that |pos| will also
+    // be zero in this case, so we don't need to adjust it.
+    bufref[0] = static_cast<unsigned char>(c);
+    ++read_limit;
+  } else {
+    // If |read_limit| is non-zero, it means that there is data in the buffer
+    // from a previous read operation. Which would also mean that |pos| is not
+    // zero. So, we decrement |pos| and write |c| in to the buffer at the new
+    // |pos|. If too many ungetc operations are performed without reads, it
+    // can lead to (pos == 0 but read_limit != 0). We will just error out in
+    // such a case.
+    if (pos == 0)
+      return EOF;
+    --pos;
+    bufref[pos] = static_cast<unsigned char>(c);
+  }
+
+  eof = false; // There is atleast one character that can be read now.
+  err = false; // This operation was a success.
+  return c;
+}
+
+ErrorOr<int> File::seek(off_t offset, int whence) {
+  FileLock lock(this);
+  if (prev_op == FileOp::WRITE && pos > 0) {
+
+    FileIOResult buf_result = platform_write(this, buf, pos);
+    if (buf_result.has_error() || buf_result.value < pos) {
+      err = true;
+      return Error(buf_result.error);
+    }
+  } else if (prev_op == FileOp::READ && whence == SEEK_CUR) {
+    // More data could have been read out from the platform file than was
+    // required. So, we have to adjust the offset we pass to platform seek
+    // function. Note that read_limit >= pos is always true.
+    offset -= (read_limit - pos);
+  }
+  pos = read_limit = 0;
+  prev_op = FileOp::SEEK;
+  // Reset the eof flag as a seek might move the file positon to some place
+  // readable.
+  eof = false;
+  auto result = platform_seek(this, offset, whence);
+  if (!result.has_value())
+    return Error(result.error());
+  return 0;
+}
+
+ErrorOr<off_t> File::tell() {
+  FileLock lock(this);
+  auto seek_target = eof ? SEEK_END : SEEK_CUR;
+  auto result = platform_seek(this, 0, seek_target);
+  if (!result.has_value() || result.value() < 0)
+    return Error(result.error());
+  off_t platform_offset = result.value();
+  if (prev_op == FileOp::READ)
+    return platform_offset - (read_limit - pos);
+  if (prev_op == FileOp::WRITE)
+    return platform_offset + pos;
+  return platform_offset;
+}
+
+int File::flush_unlocked() {
+  if (prev_op == FileOp::WRITE && pos > 0) {
+    FileIOResult buf_result = platform_write(this, buf, pos);
+    if (buf_result.has_error() || buf_result.value < pos) {
+      err = true;
+      return buf_result.error;
+    }
+    pos = 0;
+  }
+  // TODO: Add POSIX behavior for input streams.
+  return 0;
+}
+
+int File::set_buffer(void *buffer, size_t size, int buffer_mode) {
+  // We do not need to lock the file as this method should be called before
+  // other operations are performed on the file.
+  if (buffer != nullptr && size == 0)
+    return EINVAL;
+
+  switch (buffer_mode) {
+  case _IOFBF:
+  case _IOLBF:
+  case _IONBF:
+    break;
+  default:
+    return EINVAL;
+  }
+
+  if (buffer == nullptr && size != 0 && buffer_mode != _IONBF) {
+    // We exclude the case of buffer_mode == _IONBF in this branch
+    // because we don't need to allocate buffer in such a case.
+    if (own_buf) {
+      // This is one of the places where use a C allocation functon
+      // as C++ does not have an equivalent of realloc.
+      buf = reinterpret_cast<uint8_t *>(realloc(buf, size));
+      if (buf == nullptr)
+        return ENOMEM;
+    } else {
+      AllocChecker ac;
+      buf = new (ac) uint8_t[size];
+      if (!ac)
+        return ENOMEM;
+      own_buf = true;
+    }
+    bufsize = size;
+    // TODO: Handle allocation failures.
+  } else {
+    if (own_buf)
+      delete buf;
+    if (buffer_mode != _IONBF) {
+      buf = static_cast<uint8_t *>(buffer);
+      bufsize = size;
+    } else {
+      // We don't need any buffer.
+      buf = nullptr;
+      bufsize = 0;
+    }
+    own_buf = false;
+  }
+  bufmode = buffer_mode;
+  adjust_buf();
+  return 0;
+}
+
+File::ModeFlags File::mode_flags(const char *mode) {
+  // First character in |mode| should be 'a', 'r' or 'w'.
+  if (*mode != 'a' && *mode != 'r' && *mode != 'w')
+    return 0;
+
+  // There should be exaclty one main mode ('a', 'r' or 'w') character.
+  // If there are more than one main mode characters listed, then
+  // we will consider |mode| as incorrect and return 0;
+  int main_mode_count = 0;
+
+  ModeFlags flags = 0;
+  for (; *mode != '\0'; ++mode) {
+    switch (*mode) {
+    case 'r':
+      flags |= static_cast<ModeFlags>(OpenMode::READ);
+      ++main_mode_count;
+      break;
+    case 'w':
+      flags |= static_cast<ModeFlags>(OpenMode::WRITE);
+      ++main_mode_count;
+      break;
+    case '+':
+      flags |= static_cast<ModeFlags>(OpenMode::PLUS);
+      break;
+    case 'b':
+      flags |= static_cast<ModeFlags>(ContentType::BINARY);
+      break;
+    case 'a':
+      flags |= static_cast<ModeFlags>(OpenMode::APPEND);
+      ++main_mode_count;
+      break;
+    case 'x':
+      flags |= static_cast<ModeFlags>(CreateType::EXCLUSIVE);
+      break;
+    default:
+      return 0;
+    }
+  }
+
+  if (main_mode_count != 1)
+    return 0;
+
+  return flags;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/File/file.h b/contrib/llvm-project/libc/src/__support/File/file.h
new file mode 100644
index 000000000000..5c97a9c6419f
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/File/file.h
@@ -0,0 +1,324 @@
+//===--- A platform independent file data structure -------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FILE_FILE_H
+#define LLVM_LIBC_SRC___SUPPORT_FILE_FILE_H
+
+#include "hdr/stdio_macros.h"
+#include "hdr/types/off_t.h"
+#include "src/__support/CPP/new.h"
+#include "src/__support/error_or.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+#include "src/__support/threads/mutex.h"
+
+#include <stddef.h>
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+
+struct FileIOResult {
+  size_t value;
+  int error;
+
+  constexpr FileIOResult(size_t val) : value(val), error(0) {}
+  constexpr FileIOResult(size_t val, int error) : value(val), error(error) {}
+
+  constexpr bool has_error() { return error != 0; }
+
+  constexpr operator size_t() { return value; }
+};
+
+// This a generic base class to encapsulate a platform independent file data
+// structure. Platform specific specializations should create a subclass as
+// suitable for their platform.
+class File {
+public:
+  static constexpr size_t DEFAULT_BUFFER_SIZE = 1024;
+
+  using LockFunc = void(File *);
+  using UnlockFunc = void(File *);
+
+  using WriteFunc = FileIOResult(File *, const void *, size_t);
+  using ReadFunc = FileIOResult(File *, void *, size_t);
+  // The SeekFunc is expected to return the current offset of the external
+  // file position indicator.
+  using SeekFunc = ErrorOr<off_t>(File *, off_t, int);
+  using CloseFunc = int(File *);
+
+  using ModeFlags = uint32_t;
+
+  // The three different types of flags below are to be used with '|' operator.
+  // Their values correspond to mutually exclusive bits in a 32-bit unsigned
+  // integer value. A flag set can include both READ and WRITE if the file
+  // is opened in update mode (ie. if the file was opened with a '+' the mode
+  // string.)
+  enum class OpenMode : ModeFlags {
+    READ = 0x1,
+    WRITE = 0x2,
+    APPEND = 0x4,
+    PLUS = 0x8,
+  };
+
+  // Denotes a file opened in binary mode (which is specified by including
+  // the 'b' character in teh mode string.)
+  enum class ContentType : ModeFlags {
+    BINARY = 0x10,
+  };
+
+  // Denotes a file to be created for writing.
+  enum class CreateType : ModeFlags {
+    EXCLUSIVE = 0x100,
+  };
+
+private:
+  enum class FileOp : uint8_t { NONE, READ, WRITE, SEEK };
+
+  // Platform specific functions which create new file objects should initialize
+  // these fields suitably via the constructor. Typically, they should be simple
+  // syscall wrappers for the corresponding functionality.
+  WriteFunc *platform_write;
+  ReadFunc *platform_read;
+  SeekFunc *platform_seek;
+  CloseFunc *platform_close;
+
+  Mutex mutex;
+
+  // For files which are readable, we should be able to support one ungetc
+  // operation even if |buf| is nullptr. So, in the constructor of File, we
+  // set |buf| to point to this buffer character.
+  uint8_t ungetc_buf;
+
+  uint8_t *buf;   // Pointer to the stream buffer for buffered streams
+  size_t bufsize; // Size of the buffer pointed to by |buf|.
+
+  // Buffering mode to used to buffer.
+  int bufmode;
+
+  // If own_buf is true, the |buf| is owned by the stream and will be
+  // free-ed when close method is called on the stream.
+  bool own_buf;
+
+  // The mode in which the file was opened.
+  ModeFlags mode;
+
+  // Current read or write pointer.
+  size_t pos;
+
+  // Represents the previous operation that was performed.
+  FileOp prev_op;
+
+  // When the buffer is used as a read buffer, read_limit is the upper limit
+  // of the index to which the buffer can be read until.
+  size_t read_limit;
+
+  bool eof;
+  bool err;
+
+  // This is a convenience RAII class to lock and unlock file objects.
+  class FileLock {
+    File *file;
+
+  public:
+    explicit FileLock(File *f) : file(f) { file->lock(); }
+
+    ~FileLock() { file->unlock(); }
+
+    FileLock(const FileLock &) = delete;
+    FileLock(FileLock &&) = delete;
+  };
+
+protected:
+  constexpr bool write_allowed() const {
+    return mode & (static_cast<ModeFlags>(OpenMode::WRITE) |
+                   static_cast<ModeFlags>(OpenMode::APPEND) |
+                   static_cast<ModeFlags>(OpenMode::PLUS));
+  }
+
+  constexpr bool read_allowed() const {
+    return mode & (static_cast<ModeFlags>(OpenMode::READ) |
+                   static_cast<ModeFlags>(OpenMode::PLUS));
+  }
+
+public:
+  // We want this constructor to be constexpr so that global file objects
+  // like stdout do not require invocation of the constructor which can
+  // potentially lead to static initialization order fiasco. Consequently,
+  // we will assume that the |buffer| and |buffer_size| argument are
+  // meaningful - that is, |buffer| is nullptr if and only if |buffer_size|
+  // is zero. This way, we will not have to employ the semantics of
+  // the set_buffer method and allocate a buffer.
+  constexpr File(WriteFunc *wf, ReadFunc *rf, SeekFunc *sf, CloseFunc *cf,
+                 uint8_t *buffer, size_t buffer_size, int buffer_mode,
+                 bool owned, ModeFlags modeflags)
+      : platform_write(wf), platform_read(rf), platform_seek(sf),
+        platform_close(cf), mutex(/*timed=*/false, /*recursive=*/false,
+                                  /*robust=*/false, /*pshared=*/false),
+        ungetc_buf(0), buf(buffer), bufsize(buffer_size), bufmode(buffer_mode),
+        own_buf(owned), mode(modeflags), pos(0), prev_op(FileOp::NONE),
+        read_limit(0), eof(false), err(false) {
+    adjust_buf();
+  }
+
+  // Buffered write of |len| bytes from |data| without the file lock.
+  FileIOResult write_unlocked(const void *data, size_t len);
+
+  // Buffered write of |len| bytes from |data| under the file lock.
+  FileIOResult write(const void *data, size_t len) {
+    FileLock l(this);
+    return write_unlocked(data, len);
+  }
+
+  // Buffered read of |len| bytes into |data| without the file lock.
+  FileIOResult read_unlocked(void *data, size_t len);
+
+  // Buffered read of |len| bytes into |data| under the file lock.
+  FileIOResult read(void *data, size_t len) {
+    FileLock l(this);
+    return read_unlocked(data, len);
+  }
+
+  ErrorOr<int> seek(off_t offset, int whence);
+
+  ErrorOr<off_t> tell();
+
+  // If buffer has data written to it, flush it out. Does nothing if the
+  // buffer is currently being used as a read buffer.
+  int flush() {
+    FileLock lock(this);
+    return flush_unlocked();
+  }
+
+  int flush_unlocked();
+
+  // Returns EOF on error and keeps the file unchanged.
+  int ungetc_unlocked(int c);
+
+  int ungetc(int c) {
+    FileLock lock(this);
+    return ungetc_unlocked(c);
+  }
+
+  // Does the following:
+  // 1. If in write mode, Write out any data present in the buffer.
+  // 2. Call platform_close.
+  // platform_close is expected to cleanup the complete file object.
+  int close() {
+    {
+      FileLock lock(this);
+      if (prev_op == FileOp::WRITE && pos > 0) {
+        auto buf_result = platform_write(this, buf, pos);
+        if (buf_result.has_error() || buf_result.value < pos) {
+          err = true;
+          return buf_result.error;
+        }
+      }
+    }
+
+    // If we own the buffer, delete it before calling the platform close
+    // implementation. The platform close should not need to access the buffer
+    // and we need to clean it up before the entire structure is removed.
+    if (own_buf)
+      delete buf;
+
+    // Platform close is expected to cleanup the file data structure which
+    // includes the file mutex. Hence, we call platform_close after releasing
+    // the file lock. Another thread doing file operations while a thread is
+    // closing the file is undefined behavior as per POSIX.
+    return platform_close(this);
+  }
+
+  // Sets the internal buffer to |buffer| with buffering mode |mode|.
+  // |size| is the size of |buffer|. If |size| is non-zero, but |buffer|
+  // is nullptr, then a buffer owned by this file will be allocated.
+  // Else, |buffer| will not be owned by this file.
+  //
+  // Will return zero on success, or an error value on failure. Will fail
+  // if:
+  //   1. |buffer| is not a nullptr but |size| is zero.
+  //   2. |buffer_mode| is not one of _IOLBF, IOFBF or _IONBF.
+  //   3. If an allocation was required but the allocation failed.
+  // For cases 1 and 2, the error returned in EINVAL. For case 3, error returned
+  // is ENOMEM.
+  int set_buffer(void *buffer, size_t size, int buffer_mode);
+
+  void lock() { mutex.lock(); }
+  void unlock() { mutex.unlock(); }
+
+  bool error_unlocked() const { return err; }
+
+  bool error() {
+    FileLock l(this);
+    return error_unlocked();
+  }
+
+  void clearerr_unlocked() { err = false; }
+
+  void clearerr() {
+    FileLock l(this);
+    clearerr_unlocked();
+  }
+
+  bool iseof_unlocked() { return eof; }
+
+  bool iseof() {
+    FileLock l(this);
+    return iseof_unlocked();
+  }
+
+  // Returns an bit map of flags corresponding to enumerations of
+  // OpenMode, ContentType and CreateType.
+  static ModeFlags mode_flags(const char *mode);
+
+private:
+  FileIOResult write_unlocked_lbf(const uint8_t *data, size_t len);
+  FileIOResult write_unlocked_fbf(const uint8_t *data, size_t len);
+  FileIOResult write_unlocked_nbf(const uint8_t *data, size_t len);
+
+  FileIOResult read_unlocked_fbf(uint8_t *data, size_t len);
+  FileIOResult read_unlocked_nbf(uint8_t *data, size_t len);
+  size_t copy_data_from_buf(uint8_t *data, size_t len);
+
+  constexpr void adjust_buf() {
+    if (read_allowed() && (buf == nullptr || bufsize == 0)) {
+      // We should allow atleast one ungetc operation.
+      // This might give an impression that a buffer will be used even when
+      // the user does not want a buffer. But, that will not be the case.
+      // For reading, the buffering does not come into play. For writing, let
+      // us take up the three different kinds of buffering separately:
+      // 1. If user wants _IOFBF but gives a zero buffer, buffering still
+      //    happens in the OS layer until the user flushes. So, from the user's
+      //    point of view, this single byte buffer does not affect their
+      //    experience.
+      // 2. If user wants _IOLBF but gives a zero buffer, the reasoning is
+      //    very similar to the _IOFBF case.
+      // 3. If user wants _IONBF, then the buffer is ignored for writing.
+      // So, all of the above cases, having a single ungetc buffer does not
+      // affect the behavior experienced by the user.
+      buf = &ungetc_buf;
+      bufsize = 1;
+      own_buf = false; // We shouldn't call free on |buf| when closing the file.
+    }
+  }
+};
+
+// The implementaiton of this function is provided by the platform_file
+// library.
+ErrorOr<File *> openfile(const char *path, const char *mode);
+
+// The platform_file library should implement it if it relevant for that
+// platform.
+int get_fileno(File *f);
+
+extern File *stdin;
+extern File *stdout;
+extern File *stderr;
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FILE_FILE_H
diff --git a/contrib/llvm-project/libc/src/__support/File/linux/dir.cpp b/contrib/llvm-project/libc/src/__support/File/linux/dir.cpp
new file mode 100644
index 000000000000..5fe44fa8297b
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/File/linux/dir.cpp
@@ -0,0 +1,60 @@
+//===--- Linux implementation of the Dir helpers --------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/__support/File/dir.h"
+
+#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
+#include "src/__support/error_or.h"
+#include "src/__support/macros/config.h"
+
+#include "hdr/fcntl_macros.h" // For open flags
+#include <sys/syscall.h> // For syscall numbers
+
+namespace LIBC_NAMESPACE_DECL {
+
+ErrorOr<int> platform_opendir(const char *name) {
+  int open_flags = O_RDONLY | O_DIRECTORY | O_CLOEXEC;
+#ifdef SYS_open
+  int fd = LIBC_NAMESPACE::syscall_impl<int>(SYS_open, name, open_flags);
+#elif defined(SYS_openat)
+  int fd =
+      LIBC_NAMESPACE::syscall_impl<int>(SYS_openat, AT_FDCWD, name, open_flags);
+#else
+#error                                                                         \
+    "SYS_open and SYS_openat syscalls not available to perform an open operation."
+#endif
+
+  if (fd < 0) {
+    return LIBC_NAMESPACE::Error(-fd);
+  }
+  return fd;
+}
+
+ErrorOr<size_t> platform_fetch_dirents(int fd, cpp::span<uint8_t> buffer) {
+#ifdef SYS_getdents64
+  long size = LIBC_NAMESPACE::syscall_impl<long>(SYS_getdents64, fd,
+                                                 buffer.data(), buffer.size());
+#else
+#error "getdents64 syscalls not available to perform a fetch dirents operation."
+#endif
+
+  if (size < 0) {
+    return LIBC_NAMESPACE::Error(static_cast<int>(-size));
+  }
+  return size;
+}
+
+int platform_closedir(int fd) {
+  int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_close, fd);
+  if (ret < 0) {
+    return static_cast<int>(-ret);
+  }
+  return 0;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/File/linux/file.cpp b/contrib/llvm-project/libc/src/__support/File/linux/file.cpp
new file mode 100644
index 000000000000..4594dadf1ccd
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/File/linux/file.cpp
@@ -0,0 +1,185 @@
+//===--- Implementation of the Linux specialization of File ---------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "file.h"
+
+#include "hdr/stdio_macros.h"
+#include "hdr/types/off_t.h"
+#include "src/__support/CPP/new.h"
+#include "src/__support/File/file.h"
+#include "src/__support/File/linux/lseekImpl.h"
+#include "src/__support/OSUtil/fcntl.h"
+#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
+#include "src/__support/libc_errno.h"     // For error macros
+#include "src/__support/macros/config.h"
+
+#include "hdr/fcntl_macros.h" // For mode_t and other flags to the open syscall
+#include <sys/stat.h>         // For S_IS*, S_IF*, and S_IR* flags.
+#include <sys/syscall.h>      // For syscall numbers
+
+namespace LIBC_NAMESPACE_DECL {
+
+FileIOResult linux_file_write(File *f, const void *data, size_t size) {
+  auto *lf = reinterpret_cast<LinuxFile *>(f);
+  int ret =
+      LIBC_NAMESPACE::syscall_impl<int>(SYS_write, lf->get_fd(), data, size);
+  if (ret < 0) {
+    return {0, -ret};
+  }
+  return ret;
+}
+
+FileIOResult linux_file_read(File *f, void *buf, size_t size) {
+  auto *lf = reinterpret_cast<LinuxFile *>(f);
+  int ret =
+      LIBC_NAMESPACE::syscall_impl<int>(SYS_read, lf->get_fd(), buf, size);
+  if (ret < 0) {
+    return {0, -ret};
+  }
+  return ret;
+}
+
+ErrorOr<off_t> linux_file_seek(File *f, off_t offset, int whence) {
+  auto *lf = reinterpret_cast<LinuxFile *>(f);
+  auto result = internal::lseekimpl(lf->get_fd(), offset, whence);
+  if (!result.has_value())
+    return result.error();
+  return result.value();
+}
+
+int linux_file_close(File *f) {
+  auto *lf = reinterpret_cast<LinuxFile *>(f);
+  int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_close, lf->get_fd());
+  if (ret < 0) {
+    return -ret;
+  }
+  delete lf;
+  return 0;
+}
+
+ErrorOr<File *> openfile(const char *path, const char *mode) {
+  using ModeFlags = File::ModeFlags;
+  auto modeflags = File::mode_flags(mode);
+  if (modeflags == 0) {
+    // return {nullptr, EINVAL};
+    return Error(EINVAL);
+  }
+  long open_flags = 0;
+  if (modeflags & ModeFlags(File::OpenMode::APPEND)) {
+    open_flags = O_CREAT | O_APPEND;
+    if (modeflags & ModeFlags(File::OpenMode::PLUS))
+      open_flags |= O_RDWR;
+    else
+      open_flags |= O_WRONLY;
+  } else if (modeflags & ModeFlags(File::OpenMode::WRITE)) {
+    open_flags = O_CREAT | O_TRUNC;
+    if (modeflags & ModeFlags(File::OpenMode::PLUS))
+      open_flags |= O_RDWR;
+    else
+      open_flags |= O_WRONLY;
+  } else {
+    if (modeflags & ModeFlags(File::OpenMode::PLUS))
+      open_flags |= O_RDWR;
+    else
+      open_flags |= O_RDONLY;
+  }
+
+  // File created will have 0666 permissions.
+  constexpr long OPEN_MODE =
+      S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
+
+#ifdef SYS_open
+  int fd =
+      LIBC_NAMESPACE::syscall_impl<int>(SYS_open, path, open_flags, OPEN_MODE);
+#elif defined(SYS_openat)
+  int fd = LIBC_NAMESPACE::syscall_impl<int>(SYS_openat, AT_FDCWD, path,
+                                             open_flags, OPEN_MODE);
+#else
+#error "open and openat syscalls not available."
+#endif
+
+  if (fd < 0)
+    return Error(-fd);
+
+  uint8_t *buffer;
+  {
+    AllocChecker ac;
+    buffer = new (ac) uint8_t[File::DEFAULT_BUFFER_SIZE];
+    if (!ac)
+      return Error(ENOMEM);
+  }
+  AllocChecker ac;
+  auto *file = new (ac)
+      LinuxFile(fd, buffer, File::DEFAULT_BUFFER_SIZE, _IOFBF, true, modeflags);
+  if (!ac)
+    return Error(ENOMEM);
+  return file;
+}
+
+ErrorOr<LinuxFile *> create_file_from_fd(int fd, const char *mode) {
+  using ModeFlags = File::ModeFlags;
+  ModeFlags modeflags = File::mode_flags(mode);
+  if (modeflags == 0) {
+    return Error(EINVAL);
+  }
+
+  auto result = internal::fcntl(fd, F_GETFL);
+  if (!result.has_value()) {
+    return Error(EBADF);
+  }
+  int fd_flags = result.value();
+
+  using OpenMode = File::OpenMode;
+  if (((fd_flags & O_ACCMODE) == O_RDONLY &&
+       !(modeflags & static_cast<ModeFlags>(OpenMode::READ))) ||
+      ((fd_flags & O_ACCMODE) == O_WRONLY &&
+       !(modeflags & static_cast<ModeFlags>(OpenMode::WRITE)))) {
+    return Error(EINVAL);
+  }
+
+  bool do_seek = false;
+  if ((modeflags & static_cast<ModeFlags>(OpenMode::APPEND)) &&
+      !(fd_flags & O_APPEND)) {
+    do_seek = true;
+    if (!internal::fcntl(fd, F_SETFL,
+                         reinterpret_cast<void *>(fd_flags | O_APPEND))
+             .has_value()) {
+      return Error(EBADF);
+    }
+  }
+
+  uint8_t *buffer;
+  {
+    AllocChecker ac;
+    buffer = new (ac) uint8_t[File::DEFAULT_BUFFER_SIZE];
+    if (!ac) {
+      return Error(ENOMEM);
+    }
+  }
+  AllocChecker ac;
+  auto *file = new (ac)
+      LinuxFile(fd, buffer, File::DEFAULT_BUFFER_SIZE, _IOFBF, true, modeflags);
+  if (!ac) {
+    return Error(ENOMEM);
+  }
+  if (do_seek) {
+    auto result = file->seek(0, SEEK_END);
+    if (!result.has_value()) {
+      free(file);
+      return Error(result.error());
+    }
+  }
+  return file;
+}
+
+int get_fileno(File *f) {
+  auto *lf = reinterpret_cast<LinuxFile *>(f);
+  return lf->get_fd();
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/File/linux/file.h b/contrib/llvm-project/libc/src/__support/File/linux/file.h
new file mode 100644
index 000000000000..16d72a60f863
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/File/linux/file.h
@@ -0,0 +1,37 @@
+//===--- Linux specialization of the File data structure ------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "hdr/types/off_t.h"
+#include "src/__support/File/file.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+FileIOResult linux_file_write(File *, const void *, size_t);
+FileIOResult linux_file_read(File *, void *, size_t);
+ErrorOr<off_t> linux_file_seek(File *, off_t, int);
+int linux_file_close(File *);
+
+class LinuxFile : public File {
+  int fd;
+
+public:
+  constexpr LinuxFile(int file_descriptor, uint8_t *buffer, size_t buffer_size,
+                      int buffer_mode, bool owned, File::ModeFlags modeflags)
+      : File(&linux_file_write, &linux_file_read, &linux_file_seek,
+             &linux_file_close, buffer, buffer_size, buffer_mode, owned,
+             modeflags),
+        fd(file_descriptor) {}
+
+  int get_fd() const { return fd; }
+};
+
+// Create a File object and associate it with a fd.
+ErrorOr<LinuxFile *> create_file_from_fd(int fd, const char *mode);
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/File/linux/lseekImpl.h b/contrib/llvm-project/libc/src/__support/File/linux/lseekImpl.h
new file mode 100644
index 000000000000..300e5c5dd55b
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/File/linux/lseekImpl.h
@@ -0,0 +1,51 @@
+//===-- Linux implementation of lseek -------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FILE_LINUX_LSEEKIMPL_H
+#define LLVM_LIBC_SRC___SUPPORT_FILE_LINUX_LSEEKIMPL_H
+
+#include "hdr/types/off_t.h"
+#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
+#include "src/__support/common.h"
+#include "src/__support/error_or.h"
+#include "src/__support/libc_errno.h"
+#include "src/__support/macros/config.h"
+
+#include <stdint.h>      // For uint64_t.
+#include <sys/syscall.h> // For syscall numbers.
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+LIBC_INLINE ErrorOr<off_t> lseekimpl(int fd, off_t offset, int whence) {
+  off_t result;
+#ifdef SYS_lseek
+  int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_lseek, fd, offset, whence);
+  result = ret;
+#elif defined(SYS_llseek) || defined(SYS__llseek)
+  static_assert(sizeof(size_t) == 4, "size_t must be 32 bits.");
+#ifdef SYS_llseek
+  constexpr long LLSEEK_SYSCALL_NO = SYS_llseek;
+#elif defined(SYS__llseek)
+  constexpr long LLSEEK_SYSCALL_NO = SYS__llseek;
+#endif
+  off_t offset_64 = offset;
+  int ret = LIBC_NAMESPACE::syscall_impl<int>(
+      LLSEEK_SYSCALL_NO, fd, offset_64 >> 32, offset_64, &result, whence);
+#else
+#error "lseek, llseek and _llseek syscalls not available."
+#endif
+  if (ret < 0)
+    return Error(-ret);
+  return result;
+}
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FILE_LINUX_LSEEKIMPL_H
diff --git a/contrib/llvm-project/libc/src/__support/File/linux/stderr.cpp b/contrib/llvm-project/libc/src/__support/File/linux/stderr.cpp
new file mode 100644
index 000000000000..bc174792856e
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/File/linux/stderr.cpp
@@ -0,0 +1,25 @@
+//===--- Definition of Linux stderr ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "file.h"
+#include "hdr/stdio_macros.h"
+#include "hdr/types/FILE.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+constexpr size_t STDERR_BUFFER_SIZE = 0;
+static LinuxFile StdErr(2, nullptr, STDERR_BUFFER_SIZE, _IONBF, false,
+                        File::ModeFlags(File::OpenMode::APPEND));
+File *stderr = &StdErr;
+
+} // namespace LIBC_NAMESPACE_DECL
+
+extern "C" {
+FILE *stderr = reinterpret_cast<FILE *>(&LIBC_NAMESPACE::StdErr);
+}
diff --git a/contrib/llvm-project/libc/src/__support/File/linux/stdin.cpp b/contrib/llvm-project/libc/src/__support/File/linux/stdin.cpp
new file mode 100644
index 000000000000..e7b6ede85dde
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/File/linux/stdin.cpp
@@ -0,0 +1,26 @@
+//===--- Definition of Linux stdin ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "file.h"
+#include "hdr/stdio_macros.h"
+#include "hdr/types/FILE.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+constexpr size_t STDIN_BUFFER_SIZE = 512;
+uint8_t stdin_buffer[STDIN_BUFFER_SIZE];
+static LinuxFile StdIn(0, stdin_buffer, STDIN_BUFFER_SIZE, _IOFBF, false,
+                       File::ModeFlags(File::OpenMode::READ));
+File *stdin = &StdIn;
+
+} // namespace LIBC_NAMESPACE_DECL
+
+extern "C" {
+FILE *stdin = reinterpret_cast<FILE *>(&LIBC_NAMESPACE::StdIn);
+} // extern "C"
diff --git a/contrib/llvm-project/libc/src/__support/File/linux/stdout.cpp b/contrib/llvm-project/libc/src/__support/File/linux/stdout.cpp
new file mode 100644
index 000000000000..0d3b9f3d0376
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/File/linux/stdout.cpp
@@ -0,0 +1,26 @@
+//===--- Definition of Linux stdout ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "file.h"
+#include "hdr/stdio_macros.h"
+#include "hdr/types/FILE.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+constexpr size_t STDOUT_BUFFER_SIZE = 1024;
+uint8_t stdout_buffer[STDOUT_BUFFER_SIZE];
+static LinuxFile StdOut(1, stdout_buffer, STDOUT_BUFFER_SIZE, _IOLBF, false,
+                        File::ModeFlags(File::OpenMode::APPEND));
+File *stdout = &StdOut;
+
+} // namespace LIBC_NAMESPACE_DECL
+
+extern "C" {
+FILE *stdout = reinterpret_cast<FILE *>(&LIBC_NAMESPACE::StdOut);
+} // extern "C"
diff --git a/contrib/llvm-project/libc/src/__support/GPU/allocator.cpp b/contrib/llvm-project/libc/src/__support/GPU/allocator.cpp
new file mode 100644
index 000000000000..7923fbb2c1c2
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/GPU/allocator.cpp
@@ -0,0 +1,605 @@
+//===-- GPU memory allocator implementation ---------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements a parallel allocator intended for use on a GPU device.
+// The core algorithm is slab allocator using a random walk over a bitfield for
+// maximum parallel progress. Slab handling is done by a wait-free reference
+// counted guard. The first use of a slab will create it from system memory for
+// re-use. The last use will invalidate it and free the memory.
+//
+//===----------------------------------------------------------------------===//
+
+#include "allocator.h"
+
+#include "src/__support/CPP/atomic.h"
+#include "src/__support/CPP/bit.h"
+#include "src/__support/CPP/new.h"
+#include "src/__support/GPU/utils.h"
+#include "src/__support/RPC/rpc_client.h"
+#include "src/__support/threads/sleep.h"
+#include "src/string/memory_utils/inline_memcpy.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+constexpr static uint64_t MAX_SIZE = /* 64 GiB */ 64ull * 1024 * 1024 * 1024;
+constexpr static uint64_t SLAB_SIZE = /* 2 MiB */ 2ull * 1024 * 1024;
+constexpr static uint64_t ARRAY_SIZE = MAX_SIZE / SLAB_SIZE;
+constexpr static uint64_t SLAB_ALIGNMENT = SLAB_SIZE - 1;
+constexpr static uint32_t BITS_IN_WORD = sizeof(uint32_t) * 8;
+constexpr static uint32_t MIN_SIZE = 16;
+constexpr static uint32_t MIN_ALIGNMENT = MIN_SIZE - 1;
+
+// A sentinel used to indicate an invalid but non-null pointer value.
+constexpr static uint64_t SENTINEL = cpp::numeric_limits<uint64_t>::max();
+
+// The number of times we will try starting on a single index before skipping
+// past it.
+constexpr static uint32_t MAX_TRIES = 512;
+
+static_assert(!(ARRAY_SIZE & (ARRAY_SIZE - 1)), "Must be a power of two");
+
+namespace impl {
+// Allocates more memory from the system through the RPC interface. All
+// allocations from the system MUST be aligned on a 2MiB barrier. The default
+// HSA allocator has this behavior for any allocation >= 2MiB and the CUDA
+// driver provides an alignment field for virtual memory allocations.
+static void *rpc_allocate(uint64_t size) {
+  void *ptr = nullptr;
+  rpc::Client::Port port = rpc::client.open<LIBC_MALLOC>();
+  port.send_and_recv(
+      [=](rpc::Buffer *buffer, uint32_t) { buffer->data[0] = size; },
+      [&](rpc::Buffer *buffer, uint32_t) {
+        ptr = reinterpret_cast<void *>(buffer->data[0]);
+      });
+  port.close();
+  return ptr;
+}
+
+// Deallocates the associated system memory.
+static void rpc_free(void *ptr) {
+  rpc::Client::Port port = rpc::client.open<LIBC_FREE>();
+  port.send([=](rpc::Buffer *buffer, uint32_t) {
+    buffer->data[0] = reinterpret_cast<uintptr_t>(ptr);
+  });
+  port.close();
+}
+
+// Convert a potentially disjoint bitmask into an increasing integer per-lane
+// for use with indexing between gpu lanes.
+static inline uint32_t lane_count(uint64_t lane_mask) {
+  return cpp::popcount(lane_mask & ((uint64_t(1) << gpu::get_lane_id()) - 1));
+}
+
+// Obtain an initial value to seed a random number generator. We use the rounded
+// multiples of the golden ratio from xorshift* as additional spreading.
+static inline uint32_t entropy() {
+  return (static_cast<uint32_t>(gpu::processor_clock()) ^
+          (gpu::get_thread_id_x() * 0x632be59b) ^
+          (gpu::get_block_id_x() * 0x85157af5)) *
+         0x9e3779bb;
+}
+
+// Generate a random number and update the state using the xorshift32* PRNG.
+static inline uint32_t xorshift32(uint32_t &state) {
+  state ^= state << 13;
+  state ^= state >> 17;
+  state ^= state << 5;
+  return state * 0x9e3779bb;
+}
+
+// Final stage of murmurhash used to get a unique index for the global array
+static inline uint32_t hash(uint32_t x) {
+  x ^= x >> 16;
+  x *= 0x85ebca6b;
+  x ^= x >> 13;
+  x *= 0xc2b2ae35;
+  x ^= x >> 16;
+  return x;
+}
+
+// Rounds the input value to the closest permitted chunk size. Here we accept
+// the sum of the closest three powers of two. For a 2MiB slab size this is 48
+// different chunk sizes. This gives us average internal fragmentation of 87.5%.
+static inline uint32_t get_chunk_size(uint32_t x) {
+  uint32_t y = x < MIN_SIZE ? MIN_SIZE : x;
+  uint32_t pow2 = BITS_IN_WORD - cpp::countl_zero(y - 1);
+
+  uint32_t s0 = 0b0100 << (pow2 - 3);
+  uint32_t s1 = 0b0110 << (pow2 - 3);
+  uint32_t s2 = 0b0111 << (pow2 - 3);
+  uint32_t s3 = 0b1000 << (pow2 - 3);
+
+  if (s0 > y)
+    return (s0 + MIN_ALIGNMENT) & ~MIN_ALIGNMENT;
+  if (s1 > y)
+    return (s1 + MIN_ALIGNMENT) & ~MIN_ALIGNMENT;
+  if (s2 > y)
+    return (s2 + MIN_ALIGNMENT) & ~MIN_ALIGNMENT;
+  return (s3 + MIN_ALIGNMENT) & ~MIN_ALIGNMENT;
+}
+
+// Rounds to the nearest power of two.
+template <uint32_t N, typename T>
+static inline constexpr T round_up(const T x) {
+  static_assert(((N - 1) & N) == 0, "N must be a power of two");
+  return (x + N) & ~(N - 1);
+}
+
+// Perform a lane parallel memset on a uint32_t pointer.
+void uniform_memset(uint32_t *s, uint32_t c, uint32_t n, uint64_t uniform) {
+  uint64_t mask = gpu::get_lane_mask();
+  uint32_t workers = cpp::popcount(uniform);
+  for (uint32_t i = impl::lane_count(mask & uniform); i < n; i += workers)
+    s[i] = c;
+}
+
+// Indicates that the provided value is a power of two.
+static inline constexpr bool is_pow2(uint64_t x) {
+  return x && (x & (x - 1)) == 0;
+}
+
+} // namespace impl
+
+/// A slab allocator used to hand out identically sized slabs of memory.
+/// Allocation is done through random walks of a bitfield until a free bit is
+/// encountered. This reduces contention and is highly parallel on a GPU.
+///
+/// 0       4           8       16                 ...                     2 MiB
+/// ┌────────┬──────────┬────────┬──────────────────┬──────────────────────────┐
+/// │ chunk  │  index   │  pad   │    bitfield[]    │         memory[]         │
+/// └────────┴──────────┴────────┴──────────────────┴──────────────────────────┘
+///
+/// The size of the bitfield is the slab size divided by the chunk size divided
+/// by the number of bits per word. We pad the interface to ensure 16 byte
+/// alignment and to indicate that if the pointer is not aligned by 2MiB it
+/// belongs to a slab rather than the global allocator.
+struct Slab {
+  // Header metadata for the slab, aligned to the minimum alignment.
+  struct alignas(MIN_SIZE) Header {
+    uint32_t chunk_size;
+    uint32_t global_index;
+  };
+
+  // Initialize the slab with its chunk size and index in the global table for
+  // use when freeing.
+  Slab(uint32_t chunk_size, uint32_t global_index) {
+    Header *header = reinterpret_cast<Header *>(memory);
+    header->chunk_size = chunk_size;
+    header->global_index = global_index;
+  }
+
+  // Set the necessary bitfield bytes to zero in parallel using many lanes. This
+  // must be called before the bitfield can be accessed safely, memory is not
+  // guaranteed to be zero initialized in the current implementation.
+  void initialize(uint64_t uniform) {
+    uint32_t size = (bitfield_bytes(get_chunk_size()) + sizeof(uint32_t) - 1) /
+                    sizeof(uint32_t);
+    impl::uniform_memset(get_bitfield(), 0, size, uniform);
+  }
+
+  // Get the number of chunks that can theoretically fit inside this slab.
+  constexpr static uint32_t num_chunks(uint32_t chunk_size) {
+    return SLAB_SIZE / chunk_size;
+  }
+
+  // Get the number of bytes needed to contain the bitfield bits.
+  constexpr static uint32_t bitfield_bytes(uint32_t chunk_size) {
+    return __builtin_align_up(
+        ((num_chunks(chunk_size) + BITS_IN_WORD - 1) / BITS_IN_WORD) * 8,
+        MIN_ALIGNMENT + 1);
+  }
+
+  // The actual amount of memory available excluding the bitfield and metadata.
+  constexpr static uint32_t available_bytes(uint32_t chunk_size) {
+    return SLAB_SIZE - bitfield_bytes(chunk_size) - sizeof(Header);
+  }
+
+  // The number of chunks that can be stored in this slab.
+  constexpr static uint32_t available_chunks(uint32_t chunk_size) {
+    return available_bytes(chunk_size) / chunk_size;
+  }
+
+  // The length in bits of the bitfield.
+  constexpr static uint32_t usable_bits(uint32_t chunk_size) {
+    return available_bytes(chunk_size) / chunk_size;
+  }
+
+  // Get the location in the memory where we will store the chunk size.
+  uint32_t get_chunk_size() const {
+    return reinterpret_cast<const Header *>(memory)->chunk_size;
+  }
+
+  // Get the location in the memory where we will store the global index.
+  uint32_t get_global_index() const {
+    return reinterpret_cast<const Header *>(memory)->global_index;
+  }
+
+  // Get a pointer to where the bitfield is located in the memory.
+  uint32_t *get_bitfield() {
+    return reinterpret_cast<uint32_t *>(memory + sizeof(Header));
+  }
+
+  // Get a pointer to where the actual memory to be allocated lives.
+  uint8_t *get_memory(uint32_t chunk_size) {
+    return reinterpret_cast<uint8_t *>(get_bitfield()) +
+           bitfield_bytes(chunk_size);
+  }
+
+  // Get a pointer to the actual memory given an index into the bitfield.
+  void *ptr_from_index(uint32_t index, uint32_t chunk_size) {
+    return get_memory(chunk_size) + index * chunk_size;
+  }
+
+  // Convert a pointer back into its bitfield index using its offset.
+  uint32_t index_from_ptr(void *ptr, uint32_t chunk_size) {
+    return static_cast<uint32_t>(reinterpret_cast<uint8_t *>(ptr) -
+                                 get_memory(chunk_size)) /
+           chunk_size;
+  }
+
+  // Randomly walks the bitfield until it finds a free bit. Allocations attempt
+  // to put lanes right next to each other for better caching and convergence.
+  void *allocate(uint64_t lane_mask, uint64_t uniform) {
+    uint32_t chunk_size = get_chunk_size();
+    uint32_t state = impl::entropy();
+
+    // The uniform mask represents which lanes contain a uniform target pointer.
+    // We attempt to place these next to each other.
+    void *result = nullptr;
+    for (uint64_t mask = lane_mask; mask;
+         mask = gpu::ballot(lane_mask, !result)) {
+      if (result)
+        continue;
+
+      uint32_t start = gpu::broadcast_value(lane_mask, impl::xorshift32(state));
+
+      uint32_t id = impl::lane_count(uniform & mask);
+      uint32_t index = (start + id) % usable_bits(chunk_size);
+      uint32_t slot = index / BITS_IN_WORD;
+      uint32_t bit = index % BITS_IN_WORD;
+
+      // Get the mask of bits destined for the same slot and coalesce it.
+      uint64_t match = uniform & gpu::match_any(mask, slot);
+      uint32_t length = cpp::popcount(match);
+      uint32_t bitmask = static_cast<uint32_t>((uint64_t(1) << length) - 1)
+                         << bit;
+
+      uint32_t before = 0;
+      if (gpu::get_lane_id() == static_cast<uint32_t>(cpp::countr_zero(match)))
+        before = cpp::AtomicRef(get_bitfield()[slot])
+                     .fetch_or(bitmask, cpp::MemoryOrder::RELAXED);
+      before = gpu::shuffle(mask, cpp::countr_zero(match), before);
+      if (~before & (1 << bit))
+        result = ptr_from_index(index, chunk_size);
+      else
+        sleep_briefly();
+    }
+
+    cpp::atomic_thread_fence(cpp::MemoryOrder::ACQUIRE);
+    return result;
+  }
+
+  // Deallocates memory by resetting its corresponding bit in the bitfield.
+  void deallocate(void *ptr) {
+    uint32_t chunk_size = get_chunk_size();
+    uint32_t index = index_from_ptr(ptr, chunk_size);
+    uint32_t slot = index / BITS_IN_WORD;
+    uint32_t bit = index % BITS_IN_WORD;
+
+    cpp::atomic_thread_fence(cpp::MemoryOrder::RELEASE);
+    cpp::AtomicRef(get_bitfield()[slot])
+        .fetch_and(~(1u << bit), cpp::MemoryOrder::RELAXED);
+  }
+
+  // The actual memory the slab will manage. All offsets are calculated at
+  // runtime with the chunk size to keep the interface convergent when a warp or
+  // wavefront is handling multiple sizes at once.
+  uint8_t memory[SLAB_SIZE];
+};
+
+/// A wait-free guard around a pointer resource to be created dynamically if
+/// space is available and freed once there are no more users.
+struct GuardPtr {
+private:
+  struct RefCounter {
+    // Indicates that the object is in its deallocation phase and thus invalid.
+    static constexpr uint64_t INVALID = uint64_t(1) << 63;
+
+    // If a read preempts an unlock call we indicate this so the following
+    // unlock call can swap out the helped bit and maintain exclusive ownership.
+    static constexpr uint64_t HELPED = uint64_t(1) << 62;
+
+    // Resets the reference counter, cannot be reset to zero safely.
+    void reset(uint32_t n, uint64_t &count) {
+      counter.store(n, cpp::MemoryOrder::RELAXED);
+      count = n;
+    }
+
+    // Acquire a slot in the reference counter if it is not invalid.
+    bool acquire(uint32_t n, uint64_t &count) {
+      count = counter.fetch_add(n, cpp::MemoryOrder::RELAXED) + n;
+      return (count & INVALID) == 0;
+    }
+
+    // Release a slot in the reference counter. This function should only be
+    // called following a valid acquire call.
+    bool release(uint32_t n) {
+      // If this thread caused the counter to reach zero we try to invalidate it
+      // and obtain exclusive rights to deconstruct it. If the CAS failed either
+      // another thread resurrected the counter and we quit, or a parallel read
+      // helped us invalidating it. For the latter, claim that flag and return.
+      if (counter.fetch_sub(n, cpp::MemoryOrder::RELAXED) == n) {
+        uint64_t expected = 0;
+        if (counter.compare_exchange_strong(expected, INVALID,
+                                            cpp::MemoryOrder::RELAXED,
+                                            cpp::MemoryOrder::RELAXED))
+          return true;
+        else if ((expected & HELPED) &&
+                 (counter.exchange(INVALID, cpp::MemoryOrder::RELAXED) &
+                  HELPED))
+          return true;
+      }
+      return false;
+    }
+
+    // Returns the current reference count, potentially helping a releasing
+    // thread.
+    uint64_t read() {
+      auto val = counter.load(cpp::MemoryOrder::RELAXED);
+      if (val == 0 && counter.compare_exchange_strong(
+                          val, INVALID | HELPED, cpp::MemoryOrder::RELAXED))
+        return 0;
+      return (val & INVALID) ? 0 : val;
+    }
+
+    cpp::Atomic<uint64_t> counter{0};
+  };
+
+  cpp::Atomic<Slab *> ptr{nullptr};
+  RefCounter ref{};
+
+  // Should be called be a single lane for each different pointer.
+  template <typename... Args>
+  Slab *try_lock_impl(uint32_t n, uint64_t &count, Args &&...args) {
+    Slab *expected = ptr.load(cpp::MemoryOrder::RELAXED);
+    if (!expected &&
+        ptr.compare_exchange_strong(
+            expected, reinterpret_cast<Slab *>(SENTINEL),
+            cpp::MemoryOrder::RELAXED, cpp::MemoryOrder::RELAXED)) {
+      count = cpp::numeric_limits<uint64_t>::max();
+      void *raw = impl::rpc_allocate(sizeof(Slab));
+      if (!raw)
+        return nullptr;
+      return new (raw) Slab(cpp::forward<Args>(args)...);
+    }
+
+    if (!expected || expected == reinterpret_cast<Slab *>(SENTINEL))
+      return nullptr;
+
+    if (!ref.acquire(n, count))
+      return nullptr;
+
+    cpp::atomic_thread_fence(cpp::MemoryOrder::ACQUIRE);
+    return ptr.load(cpp::MemoryOrder::RELAXED);
+  }
+
+  // Finalize the associated memory and signal that it is ready to use by
+  // resetting the counter.
+  void finalize(Slab *mem, uint32_t n, uint64_t &count) {
+    cpp::atomic_thread_fence(cpp::MemoryOrder::RELEASE);
+    ptr.store(mem, cpp::MemoryOrder::RELAXED);
+    cpp::atomic_thread_fence(cpp::MemoryOrder::ACQUIRE);
+    if (!ref.acquire(n, count))
+      ref.reset(n, count);
+  }
+
+public:
+  // Attempt to lock access to the pointer, potentially creating it if empty.
+  // The uniform mask represents which lanes share the same pointer. For each
+  // uniform value we elect a leader to handle it on behalf of the other lanes.
+  template <typename... Args>
+  Slab *try_lock(uint64_t lane_mask, uint64_t uniform, uint64_t &count,
+                 Args &&...args) {
+    count = 0;
+    Slab *result = nullptr;
+    if (gpu::get_lane_id() == uint32_t(cpp::countr_zero(uniform)))
+      result = try_lock_impl(cpp::popcount(uniform), count,
+                             cpp::forward<Args>(args)...);
+    result = gpu::shuffle(lane_mask, cpp::countr_zero(uniform), result);
+    count = gpu::shuffle(lane_mask, cpp::countr_zero(uniform), count);
+
+    if (!result)
+      return nullptr;
+
+    // We defer storing the newly allocated slab until now so that we can use
+    // multiple lanes to initialize it and release it for use.
+    if (count == cpp::numeric_limits<uint64_t>::max()) {
+      result->initialize(uniform);
+      if (gpu::get_lane_id() == uint32_t(cpp::countr_zero(uniform)))
+        finalize(result, cpp::popcount(uniform), count);
+    }
+
+    if (count != cpp::numeric_limits<uint64_t>::max())
+      count = count - cpp::popcount(uniform) + impl::lane_count(uniform) + 1;
+
+    return result;
+  }
+
+  // Release the associated lock on the pointer, potentially destroying it.
+  void unlock(uint64_t lane_mask, uint64_t mask) {
+    cpp::atomic_thread_fence(cpp::MemoryOrder::RELEASE);
+    if (gpu::get_lane_id() == uint32_t(cpp::countr_zero(mask)) &&
+        ref.release(cpp::popcount(mask))) {
+      Slab *p = ptr.load(cpp::MemoryOrder::RELAXED);
+      p->~Slab();
+      impl::rpc_free(p);
+      cpp::atomic_thread_fence(cpp::MemoryOrder::RELEASE);
+      ptr.store(nullptr, cpp::MemoryOrder::RELAXED);
+    }
+    gpu::sync_lane(lane_mask);
+  }
+
+  // Get the current value of the reference counter.
+  uint64_t use_count() { return ref.read(); }
+};
+
+// The global array used to search for a valid slab to allocate from.
+static GuardPtr slots[ARRAY_SIZE] = {};
+
+// Tries to find a slab in the table that can support the given chunk size.
+static Slab *find_slab(uint32_t chunk_size) {
+  // We start at a hashed value to spread out different chunk sizes.
+  uint32_t start = impl::hash(chunk_size);
+  uint64_t lane_mask = gpu::get_lane_mask();
+  uint64_t uniform = gpu::match_any(lane_mask, chunk_size);
+
+  Slab *result = nullptr;
+  uint32_t nudge = 0;
+  for (uint64_t mask = lane_mask; mask;
+       mask = gpu::ballot(lane_mask, !result), ++nudge) {
+    uint32_t index = cpp::numeric_limits<uint32_t>::max();
+    for (uint32_t offset = nudge / MAX_TRIES;
+         gpu::ballot(lane_mask, index == cpp::numeric_limits<uint32_t>::max());
+         offset += cpp::popcount(uniform & lane_mask)) {
+      uint32_t candidate =
+          (start + offset + impl::lane_count(uniform & lane_mask)) % ARRAY_SIZE;
+      uint64_t available =
+          gpu::ballot(lane_mask, slots[candidate].use_count() <
+                                     Slab::available_chunks(chunk_size));
+      uint32_t new_index = gpu::shuffle(
+          lane_mask, cpp::countr_zero(available & uniform), candidate);
+
+      // Each uniform group will use the first empty slot they find.
+      if ((index == cpp::numeric_limits<uint32_t>::max() &&
+           (available & uniform)))
+        index = new_index;
+
+      // Guaruntees that this loop will eventuall exit if there is no space.
+      if (offset >= ARRAY_SIZE) {
+        result = reinterpret_cast<Slab *>(SENTINEL);
+        index = 0;
+      }
+    }
+
+    // Try to claim a slot for the found slot.
+    if (!result) {
+      uint64_t reserved = 0;
+      Slab *slab = slots[index].try_lock(lane_mask & mask, uniform & mask,
+                                         reserved, chunk_size, index);
+      // If we find a slab with a matching chunk size then we store the result.
+      // Otherwise, we need to free the claimed lock and continue. In the case
+      // of out-of-memory we return a sentinel value.
+      if (slab && reserved <= Slab::available_chunks(chunk_size) &&
+          slab->get_chunk_size() == chunk_size) {
+        result = slab;
+      } else if (slab && (reserved > Slab::available_chunks(chunk_size) ||
+                          slab->get_chunk_size() != chunk_size)) {
+        if (slab->get_chunk_size() != chunk_size)
+          start = index + 1;
+        slots[index].unlock(gpu::get_lane_mask(),
+                            gpu::get_lane_mask() & uniform);
+      } else if (!slab && reserved == cpp::numeric_limits<uint64_t>::max()) {
+        result = reinterpret_cast<Slab *>(SENTINEL);
+      } else {
+        sleep_briefly();
+      }
+    }
+  }
+  return result;
+}
+
+// Release the lock associated with a given slab.
+static void release_slab(Slab *slab) {
+  uint32_t index = slab->get_global_index();
+  uint64_t lane_mask = gpu::get_lane_mask();
+  uint64_t uniform = gpu::match_any(lane_mask, index);
+  slots[index].unlock(lane_mask, uniform);
+}
+
+namespace gpu {
+
+void *allocate(uint64_t size) {
+  if (!size)
+    return nullptr;
+
+  // Allocations requiring a full slab or more go directly to memory.
+  if (size >= SLAB_SIZE / 2)
+    return impl::rpc_allocate(impl::round_up<SLAB_SIZE>(size));
+
+  // Try to find a slab for the rounded up chunk size and allocate from it.
+  uint32_t chunk_size = impl::get_chunk_size(static_cast<uint32_t>(size));
+  Slab *slab = find_slab(chunk_size);
+  if (!slab || slab == reinterpret_cast<Slab *>(SENTINEL))
+    return nullptr;
+
+  uint64_t lane_mask = gpu::get_lane_mask();
+  uint64_t uniform = gpu::match_any(lane_mask, slab->get_global_index());
+  void *ptr = slab->allocate(lane_mask, uniform);
+  return ptr;
+}
+
+void deallocate(void *ptr) {
+  if (!ptr)
+    return;
+
+  // All non-slab allocations will be aligned on a 2MiB boundary.
+  if (__builtin_is_aligned(ptr, SLAB_ALIGNMENT + 1))
+    return impl::rpc_free(ptr);
+
+  // The original slab pointer is the 2MiB boundary using the given pointer.
+  Slab *slab = cpp::launder(reinterpret_cast<Slab *>(
+      (reinterpret_cast<uintptr_t>(ptr) & ~SLAB_ALIGNMENT)));
+  slab->deallocate(ptr);
+  release_slab(slab);
+}
+
+void *reallocate(void *ptr, uint64_t size) {
+  if (ptr == nullptr)
+    return gpu::allocate(size);
+
+  // Non-slab allocations are considered foreign pointers so we fail.
+  if (__builtin_is_aligned(ptr, SLAB_ALIGNMENT + 1))
+    return nullptr;
+
+  // The original slab pointer is the 2MiB boundary using the given pointer.
+  Slab *slab = cpp::launder(reinterpret_cast<Slab *>(
+      (reinterpret_cast<uintptr_t>(ptr) & ~SLAB_ALIGNMENT)));
+  if (slab->get_chunk_size() >= size)
+    return ptr;
+
+  // If we need a new chunk we reallocate and copy it over.
+  void *new_ptr = gpu::allocate(size);
+  inline_memcpy(new_ptr, ptr, slab->get_chunk_size());
+  gpu::deallocate(ptr);
+  return new_ptr;
+}
+
+void *aligned_allocate(uint32_t alignment, uint64_t size) {
+  // All alignment values must be a non-zero power of two.
+  if (!impl::is_pow2(alignment))
+    return nullptr;
+
+  // If the requested alignment is less than what we already provide this is
+  // just a normal allocation.
+  if (alignment <= MIN_ALIGNMENT + 1)
+    return gpu::allocate(size);
+
+  // We can't handle alignments greater than 2MiB so we simply fail.
+  if (alignment > SLAB_ALIGNMENT + 1)
+    return nullptr;
+
+  // Trying to handle allocation internally would break the assumption that each
+  // chunk is identical to eachother. Allocate enough memory with worst-case
+  // alignment and then round up. The index logic will round down properly.
+  uint64_t rounded = size + alignment - MIN_ALIGNMENT;
+  void *ptr = gpu::allocate(rounded);
+  return __builtin_align_up(ptr, alignment);
+}
+
+} // namespace gpu
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/GPU/allocator.h b/contrib/llvm-project/libc/src/__support/GPU/allocator.h
new file mode 100644
index 000000000000..a7cf8bceef27
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/GPU/allocator.h
@@ -0,0 +1,26 @@
+//===-- GPU memory allocator implementation ---------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_GPU_ALLOCATOR_H
+#define LLVM_LIBC_SRC___SUPPORT_GPU_ALLOCATOR_H
+
+#include "src/__support/macros/config.h"
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace gpu {
+
+void *allocate(uint64_t size);
+void deallocate(void *ptr);
+void *reallocate(void *ptr, uint64_t size);
+void *aligned_allocate(uint32_t alignment, uint64_t size);
+
+} // namespace gpu
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_GPU_ALLOCATOR_H
diff --git a/contrib/llvm-project/libc/src/__support/GPU/utils.h b/contrib/llvm-project/libc/src/__support/GPU/utils.h
new file mode 100644
index 000000000000..1b3e6edfc4e0
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/GPU/utils.h
@@ -0,0 +1,138 @@
+//===---------------- Implementation of GPU utils ---------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_GPU_UTILS_H
+#define LLVM_LIBC_SRC___SUPPORT_GPU_UTILS_H
+
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+
+#if !__has_include(<gpuintrin.h>)
+#error "Unsupported compiler"
+#endif
+
+#include <gpuintrin.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace gpu {
+
+template <typename T> using Private = __gpu_private T;
+template <typename T> using Constant = __gpu_constant T;
+template <typename T> using Local = __gpu_local T;
+template <typename T> using Global = __gpu_local T;
+
+LIBC_INLINE uint32_t get_num_blocks_x() { return __gpu_num_blocks(0); }
+
+LIBC_INLINE uint32_t get_num_blocks_y() { return __gpu_num_blocks(1); }
+
+LIBC_INLINE uint32_t get_num_blocks_z() { return __gpu_num_blocks(2); }
+
+LIBC_INLINE uint64_t get_num_blocks() {
+  return get_num_blocks_x() * get_num_blocks_y() * get_num_blocks_z();
+}
+
+LIBC_INLINE uint32_t get_block_id_x() { return __gpu_block_id(0); }
+
+LIBC_INLINE uint32_t get_block_id_y() { return __gpu_block_id(1); }
+
+LIBC_INLINE uint32_t get_block_id_z() { return __gpu_block_id(2); }
+
+LIBC_INLINE uint64_t get_block_id() {
+  return get_block_id_x() + get_num_blocks_x() * get_block_id_y() +
+         get_num_blocks_x() * get_num_blocks_y() * get_block_id_z();
+}
+
+LIBC_INLINE uint32_t get_num_threads_x() { return __gpu_num_threads(0); }
+
+LIBC_INLINE uint32_t get_num_threads_y() { return __gpu_num_threads(1); }
+
+LIBC_INLINE uint32_t get_num_threads_z() { return __gpu_num_threads(2); }
+
+LIBC_INLINE uint64_t get_num_threads() {
+  return get_num_threads_x() * get_num_threads_y() * get_num_threads_z();
+}
+
+LIBC_INLINE uint32_t get_thread_id_x() { return __gpu_thread_id(0); }
+
+LIBC_INLINE uint32_t get_thread_id_y() { return __gpu_thread_id(1); }
+
+LIBC_INLINE uint32_t get_thread_id_z() { return __gpu_thread_id(2); }
+
+LIBC_INLINE uint64_t get_thread_id() {
+  return get_thread_id_x() + get_num_threads_x() * get_thread_id_y() +
+         get_num_threads_x() * get_num_threads_y() * get_thread_id_z();
+}
+
+LIBC_INLINE uint32_t get_lane_size() { return __gpu_num_lanes(); }
+
+LIBC_INLINE uint32_t get_lane_id() { return __gpu_lane_id(); }
+
+LIBC_INLINE uint64_t get_lane_mask() { return __gpu_lane_mask(); }
+
+LIBC_INLINE uint32_t broadcast_value(uint64_t lane_mask, uint32_t x) {
+  return __gpu_read_first_lane_u32(lane_mask, x);
+}
+
+LIBC_INLINE uint64_t ballot(uint64_t lane_mask, bool x) {
+  return __gpu_ballot(lane_mask, x);
+}
+
+LIBC_INLINE void sync_threads() { __gpu_sync_threads(); }
+
+LIBC_INLINE void sync_lane(uint64_t lane_mask) { __gpu_sync_lane(lane_mask); }
+
+LIBC_INLINE uint32_t shuffle(uint64_t lane_mask, uint32_t idx, uint32_t x,
+                             uint32_t width = __gpu_num_lanes()) {
+  return __gpu_shuffle_idx_u32(lane_mask, idx, x, width);
+}
+
+LIBC_INLINE uint64_t shuffle(uint64_t lane_mask, uint32_t idx, uint64_t x,
+                             uint32_t width = __gpu_num_lanes()) {
+  return __gpu_shuffle_idx_u64(lane_mask, idx, x, width);
+}
+
+template <typename T>
+LIBC_INLINE T *shuffle(uint64_t lane_mask, uint32_t idx, T *x,
+                       uint32_t width = __gpu_num_lanes()) {
+  return reinterpret_cast<T *>(__gpu_shuffle_idx_u64(
+      lane_mask, idx, reinterpret_cast<uintptr_t>(x), width));
+}
+
+LIBC_INLINE uint64_t match_any(uint64_t lane_mask, uint32_t x) {
+  return __gpu_match_any_u32(lane_mask, x);
+}
+
+LIBC_INLINE uint64_t match_all(uint64_t lane_mask, uint32_t x) {
+  return __gpu_match_all_u32(lane_mask, x);
+}
+
+[[noreturn]] LIBC_INLINE void end_program() { __gpu_exit(); }
+
+LIBC_INLINE bool is_first_lane(uint64_t lane_mask) {
+  return __gpu_is_first_in_lane(lane_mask);
+}
+
+LIBC_INLINE uint32_t reduce(uint64_t lane_mask, uint32_t x) {
+  return __gpu_lane_sum_u32(lane_mask, x);
+}
+
+LIBC_INLINE uint32_t scan(uint64_t lane_mask, uint32_t x) {
+  return __gpu_lane_scan_u32(lane_mask, x);
+}
+
+LIBC_INLINE uint64_t fixed_frequency_clock() {
+  return __builtin_readsteadycounter();
+}
+
+LIBC_INLINE uint64_t processor_clock() { return __builtin_readcyclecounter(); }
+
+} // namespace gpu
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_GPU_UTILS_H
diff --git a/contrib/llvm-project/libc/src/__support/HashTable/bitmask.h b/contrib/llvm-project/libc/src/__support/HashTable/bitmask.h
new file mode 100644
index 000000000000..3cac481b8060
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/HashTable/bitmask.h
@@ -0,0 +1,93 @@
+//===-- HashTable BitMasks --------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_HASHTABLE_BITMASK_H
+#define LLVM_LIBC_SRC___SUPPORT_HASHTABLE_BITMASK_H
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/cpu_features.h"
+#include <stddef.h> // size_t
+#include <stdint.h> // uint8_t, uint64_t
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+// Implementations of the bitmask.
+// The backend word type may vary depending on different microarchitectures.
+// For example, with X86 SSE2, the bitmask is just the 16bit unsigned integer
+// corresponding to lanes in a SIMD register.
+//
+// Notice that this implementation is simplified from traditional swisstable:
+// since we do not support deletion, we only need to care about if the highest
+// bit is set or not:
+// =============================
+// | Slot Status |   Bitmask   |
+// =============================
+// |  Available  | 0b1xxx'xxxx |
+// |  Occupied   | 0b0xxx'xxxx |
+// =============================
+template <typename T, size_t WORD_STRIDE> struct BitMaskAdaptor {
+  // A stride in the bitmask may use multiple bits.
+  LIBC_INLINE_VAR constexpr static size_t STRIDE = WORD_STRIDE;
+
+  T word;
+
+  // Check if any bit is set inside the word.
+  LIBC_INLINE constexpr bool any_bit_set() const { return word != 0; }
+
+  // Count trailing zeros with respect to stride. (Assume the bitmask is none
+  // zero.)
+  LIBC_INLINE constexpr size_t lowest_set_bit_nonzero() const {
+    return cpp::countr_zero<T>(word) / WORD_STRIDE;
+  }
+};
+
+// Not all bitmasks are iterable --- only those who has only MSB set in each
+// lane. Hence, we make the types nomially different to distinguish them.
+template <class BitMask> struct IteratableBitMaskAdaptor : public BitMask {
+  // Use the bitmask as an iterator. Update the state and return current lowest
+  // set bit. To make the bitmask iterable, each stride must contain 0 or exact
+  // 1 set bit.
+  LIBC_INLINE void remove_lowest_bit() {
+    // Remove the last set bit inside the word:
+    //    word              = 011110100 (original value)
+    //    word - 1          = 011110011 (invert all bits up to the last set bit)
+    //    word & (word - 1) = 011110000 (value with the last bit cleared)
+    this->word = this->word & (this->word - 1);
+  }
+  using value_type = size_t;
+  using iterator = BitMask;
+  using const_iterator = BitMask;
+  LIBC_INLINE size_t operator*() const {
+    return this->lowest_set_bit_nonzero();
+  }
+  LIBC_INLINE IteratableBitMaskAdaptor &operator++() {
+    this->remove_lowest_bit();
+    return *this;
+  }
+  LIBC_INLINE IteratableBitMaskAdaptor begin() { return *this; }
+  LIBC_INLINE IteratableBitMaskAdaptor end() { return {BitMask{0}}; }
+  LIBC_INLINE bool operator==(const IteratableBitMaskAdaptor &other) {
+    return this->word == other.word;
+  }
+  LIBC_INLINE bool operator!=(const IteratableBitMaskAdaptor &other) {
+    return this->word != other.word;
+  }
+};
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
+
+#if defined(LIBC_TARGET_CPU_HAS_SSE2) && defined(__LIBC_EXPLICIT_SIMD_OPT)
+#include "sse2/bitmask_impl.inc"
+#else
+#include "generic/bitmask_impl.inc"
+#endif
+
+#endif // LLVM_LIBC_SRC___SUPPORT_HASHTABLE_BITMASK_H
diff --git a/contrib/llvm-project/libc/src/__support/HashTable/generic/bitmask_impl.inc b/contrib/llvm-project/libc/src/__support/HashTable/generic/bitmask_impl.inc
new file mode 100644
index 000000000000..d526dc1ece29
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/HashTable/generic/bitmask_impl.inc
@@ -0,0 +1,124 @@
+//===-- HashTable BitMasks Generic Implementation ---------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/common.h"
+#include "src/__support/endian_internal.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+// GPU architectures are 64-bit but use 32-bit general purpose registers.
+#ifdef LIBC_TARGET_ARCH_IS_GPU
+using bitmask_t = uint32_t;
+#else
+using bitmask_t = uintptr_t;
+#endif
+
+// Helper function to spread a byte across the whole word.
+// Accumutively, the procedure looks like:
+//    byte                  = 0x00000000000000ff
+//    byte | (byte << 8)    = 0x000000000000ffff
+//    byte | (byte << 16)   = 0x00000000ffffffff
+//    byte | (byte << 32)   = 0xffffffffffffffff
+LIBC_INLINE constexpr bitmask_t repeat_byte(bitmask_t byte) {
+  size_t shift_amount = 8;
+  while (shift_amount < sizeof(bitmask_t) * 8) {
+    byte |= byte << shift_amount;
+    shift_amount <<= 1;
+  }
+  return byte;
+}
+
+using BitMask = BitMaskAdaptor<bitmask_t, 0x8ul>;
+using IteratableBitMask = IteratableBitMaskAdaptor<BitMask>;
+
+struct Group {
+  LIBC_INLINE_VAR static constexpr bitmask_t MASK = repeat_byte(0x80ul);
+  bitmask_t data;
+
+  // Load a group of control words from an arbitary address.
+  LIBC_INLINE static Group load(const void *addr) {
+    char bytes[sizeof(bitmask_t)];
+
+    for (size_t i = 0; i < sizeof(bitmask_t); ++i)
+      bytes[i] = static_cast<const char *>(addr)[i];
+    return Group{cpp::bit_cast<bitmask_t>(bytes)};
+  }
+
+  // Load a group of control words from an aligned address.
+  LIBC_INLINE static Group load_aligned(const void *addr) {
+    return *static_cast<const Group *>(addr);
+  }
+
+  // Find out the lanes equal to the given byte and return the bitmask
+  // with corresponding bits set.
+  LIBC_INLINE IteratableBitMask match_byte(uint8_t byte) const {
+    // Given byte = 0x10, suppose the data is:
+    //
+    //       data = [ 0x10 | 0x10 | 0x00 | 0xF1 | ... ]
+    //
+    // First, we compare the byte using XOR operation:
+    //
+    //        [ 0x10 | 0x10 | 0x10 | 0x10 | ... ]   (0)
+    //      ^ [ 0x10 | 0x10 | 0x00 | 0xF1 | ... ]   (1)
+    //      = [ 0x00 | 0x00 | 0x10 | 0xE1 | ... ]   (2)
+    //
+    // Notice that the equal positions will now be 0x00, so if we substract 0x01
+    // respective to every byte, it will need to carry the substraction to upper
+    // bits (assume no carry from the hidden parts)
+    //        [ 0x00 | 0x00 | 0x10 | 0xE1 | ... ]   (2)
+    //      - [ 0x01 | 0x01 | 0x01 | 0x01 | ... ]   (3)
+    //      = [ 0xFE | 0xFF | 0x0F | 0xE0 | ... ]   (4)
+    //
+    // But there may be some bytes whose highest bit is already set after the
+    // xor operation. To rule out these positions, we AND them with the NOT
+    // of the XOR result:
+    //
+    //        [ 0xFF | 0xFF | 0xEF | 0x1E | ... ]   (5, NOT (2))
+    //      & [ 0xFE | 0xFF | 0x0F | 0xE0 | ... ]   (4)
+    //      = [ 0xFE | 0xFF | 0x0F | 0x10 | ... ]   (6)
+    //
+    // To make the bitmask iteratable, only one bit can be set in each stride.
+    // So we AND each byte with 0x80 and keep only the highest bit:
+    //
+    //        [ 0xFE | 0xFF | 0x0F | 0x10 | ... ]   (6)
+    //      & [ 0x80 | 0x80 | 0x80 | 0x80 | ... ]   (7)
+    //      = [ 0x80 | 0x80 | 0x00 | 0x00 | ... ]   (8)
+    //
+    // However, there are possitbilites for false positives. For example, if the
+    // data is [ 0x10 | 0x11 | 0x10 | 0xF1 | ... ]. This only happens when there
+    // is a key only differs from the searched by the lowest bit. The claims
+    // are:
+    //
+    //  - This never happens for `EMPTY` and `DELETED`, only full entries.
+    //  - The check for key equality will catch these.
+    //  - This only happens if there is at least 1 true match.
+    //  - The chance of this happening is very low (< 1% chance per byte).
+    static constexpr bitmask_t ONES = repeat_byte(0x01ul);
+    auto cmp = data ^ repeat_byte(static_cast<bitmask_t>(byte) & 0xFFul);
+    auto result =
+        LIBC_NAMESPACE::Endian::to_little_endian((cmp - ONES) & ~cmp & MASK);
+    return {BitMask{result}};
+  }
+
+  // Find out the lanes equal to EMPTY or DELETE (highest bit set) and
+  // return the bitmask with corresponding bits set.
+  LIBC_INLINE BitMask mask_available() const {
+    bitmask_t le_data = LIBC_NAMESPACE::Endian::to_little_endian(data);
+    return {le_data & MASK};
+  }
+
+  LIBC_INLINE IteratableBitMask occupied() const {
+    bitmask_t available = mask_available().word;
+    return {BitMask{available ^ MASK}};
+  }
+};
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/HashTable/randomness.h b/contrib/llvm-project/libc/src/__support/HashTable/randomness.h
new file mode 100644
index 000000000000..7e54c9aa6ad1
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/HashTable/randomness.h
@@ -0,0 +1,61 @@
+//===-- HashTable Randomness ------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_HASHTABLE_RANDOMNESS_H
+#define LLVM_LIBC_SRC___SUPPORT_HASHTABLE_RANDOMNESS_H
+
+#include "src/__support/common.h"
+#include "src/__support/hash.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#if defined(LIBC_HASHTABLE_USE_GETRANDOM)
+#include "hdr/errno_macros.h"
+#include "src/__support/OSUtil/linux/getrandom.h"
+#endif
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+namespace randomness {
+// We need an initial state for the hash function. More entropy are to be added
+// at the first use and each round of reseeding. The following random numbers
+// are generated from https://www.random.org/cgi-bin/randbyte?nbytes=64&format=h
+LIBC_INLINE_VAR thread_local HashState state = {
+    0x38049a7ea6f5a79b, 0x45cb02147c3f718a, 0x53eb431c12770718,
+    0x5b55742bd20a2fcb};
+LIBC_INLINE_VAR thread_local uint64_t counter = 0;
+LIBC_INLINE_VAR constexpr uint64_t RESEED_PERIOD = 1024;
+LIBC_INLINE uint64_t next_random_seed() {
+  if (counter % RESEED_PERIOD == 0) {
+    uint64_t entropy[2];
+    entropy[0] = reinterpret_cast<uint64_t>(&entropy);
+    entropy[1] = reinterpret_cast<uint64_t>(&state);
+#if defined(LIBC_HASHTABLE_USE_GETRANDOM)
+    size_t count = sizeof(entropy);
+    uint8_t *buffer = reinterpret_cast<uint8_t *>(entropy);
+    while (count > 0) {
+      auto len = internal::getrandom(buffer, count, 0);
+      if (!len.has_value()) {
+        if (len.error() == ENOSYS)
+          break;
+        continue;
+      }
+      count -= len.value();
+      buffer += len.value();
+    }
+#endif
+    state.update(&entropy, sizeof(entropy));
+  }
+  state.update(&counter, sizeof(counter));
+  counter++;
+  return state.finish();
+}
+
+} // namespace randomness
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
+#endif // LLVM_LIBC_SRC___SUPPORT_HASHTABLE_RANDOMNESS_H
diff --git a/contrib/llvm-project/libc/src/__support/HashTable/sse2/bitmask_impl.inc b/contrib/llvm-project/libc/src/__support/HashTable/sse2/bitmask_impl.inc
new file mode 100644
index 000000000000..eb4b3b5119f2
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/HashTable/sse2/bitmask_impl.inc
@@ -0,0 +1,52 @@
+//===-- HashTable BitMasks SSE2 Implementation ------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include <immintrin.h>
+
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+// With SSE2, every bitmask is iteratable as
+// we use single bit to encode the data.
+
+using BitMask = BitMaskAdaptor<uint16_t, 0x1u>;
+using IteratableBitMask = IteratableBitMaskAdaptor<BitMask>;
+
+struct Group {
+  __m128i data;
+
+  // Load a group of control words from an arbitary address.
+  LIBC_INLINE static Group load(const void *addr) {
+    return {_mm_loadu_si128(static_cast<const __m128i *>(addr))};
+  }
+
+  // Load a group of control words from an aligned address.
+  LIBC_INLINE static Group load_aligned(const void *addr) {
+    return {_mm_load_si128(static_cast<const __m128i *>(addr))};
+  }
+
+  // Find out the lanes equal to the given byte and return the bitmask
+  // with corresponding bits set.
+  LIBC_INLINE IteratableBitMask match_byte(uint8_t byte) const {
+    auto cmp = _mm_cmpeq_epi8(data, _mm_set1_epi8(byte));
+    auto bitmask = static_cast<uint16_t>(_mm_movemask_epi8(cmp));
+    return {{bitmask}};
+  }
+
+  LIBC_INLINE BitMask mask_available() const {
+    auto bitmask = static_cast<uint16_t>(_mm_movemask_epi8(data));
+    return {bitmask};
+  }
+
+  LIBC_INLINE IteratableBitMask occupied() const {
+    return {{static_cast<uint16_t>(~mask_available().word)}};
+  }
+};
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/HashTable/table.h b/contrib/llvm-project/libc/src/__support/HashTable/table.h
new file mode 100644
index 000000000000..10dd9711afbf
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/HashTable/table.h
@@ -0,0 +1,356 @@
+//===-- Resizable Monotonic HashTable ---------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_HASHTABLE_TABLE_H
+#define LLVM_LIBC_SRC___SUPPORT_HASHTABLE_TABLE_H
+
+#include "hdr/types/ENTRY.h"
+#include "src/__support/CPP/bit.h" // bit_ceil
+#include "src/__support/CPP/new.h"
+#include "src/__support/HashTable/bitmask.h"
+#include "src/__support/hash.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h"
+#include "src/__support/memory_size.h"
+#include "src/string/memory_utils/inline_strcmp.h"
+#include "src/string/string_utils.h"
+#include <stddef.h>
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+LIBC_INLINE uint8_t secondary_hash(uint64_t hash) {
+  // top 7 bits of the hash.
+  return static_cast<uint8_t>(hash >> 57);
+}
+
+// Probe sequence based on triangular numbers, which is guaranteed (since our
+// table size is a power of two) to visit every group of elements exactly once.
+//
+// A triangular probe has us jump by 1 more group every time. So first we
+// jump by 1 group (meaning we just continue our linear scan), then 2 groups
+// (skipping over 1 group), then 3 groups (skipping over 2 groups), and so on.
+//
+// If we set sizeof(Group) to be one unit:
+//               T[k] = sum {1 + 2 + ... + k} = k * (k + 1) / 2
+// It is provable that T[k] mod 2^m generates a permutation of
+//                0, 1, 2, 3, ..., 2^m - 2, 2^m - 1
+// Detailed proof is available at:
+// https://fgiesen.wordpress.com/2015/02/22/triangular-numbers-mod-2n/
+struct ProbeSequence {
+  size_t position;
+  size_t stride;
+  size_t entries_mask;
+
+  LIBC_INLINE size_t next() {
+    position += stride;
+    position &= entries_mask;
+    stride += sizeof(Group);
+    return position;
+  }
+};
+
+// The number of entries is at least group width: we do not
+// need to do the fixup when we set the control bytes.
+// The number of entries is at least 8: we don't have to worry
+// about special sizes when check the fullness of the table.
+LIBC_INLINE size_t capacity_to_entries(size_t cap) {
+  if (8 >= sizeof(Group) && cap < 8)
+    return 8;
+  if (16 >= sizeof(Group) && cap < 15)
+    return 16;
+  if (cap < sizeof(Group))
+    cap = sizeof(Group);
+  // overflow is always checked in allocate()
+  return cpp::bit_ceil(cap * 8 / 7);
+}
+
+// The heap memory layout for N buckets HashTable is as follows:
+//
+//             =======================
+//             |   N * Entry         |
+//             ======================= <- align boundary
+//             |   Header            |
+//             ======================= <- align boundary (for fast resize)
+//             |   (N + 1) * Byte    |
+//             =======================
+//
+// The trailing group part is to make sure we can always load
+// a whole group of control bytes.
+
+struct HashTable {
+  HashState state;
+  size_t entries_mask;    // number of buckets - 1
+  size_t available_slots; // less than capacity
+private:
+  // How many entries are there in the table.
+  LIBC_INLINE size_t num_of_entries() const { return entries_mask + 1; }
+
+  // How many entries can we store in the table before resizing.
+  LIBC_INLINE size_t full_capacity() const { return num_of_entries() / 8 * 7; }
+
+  // The alignment of the whole memory area is the maximum of the alignment
+  // among the following types:
+  // - HashTable
+  // - ENTRY
+  // - Group
+  LIBC_INLINE constexpr static size_t table_alignment() {
+    size_t left_align = alignof(HashTable) > alignof(ENTRY) ? alignof(HashTable)
+                                                            : alignof(ENTRY);
+    return left_align > alignof(Group) ? left_align : alignof(Group);
+  }
+
+  LIBC_INLINE bool is_full() const { return available_slots == 0; }
+
+  LIBC_INLINE size_t offset_from_entries() const {
+    size_t entries_size = num_of_entries() * sizeof(ENTRY);
+    return entries_size +
+           SafeMemSize::offset_to(entries_size, table_alignment());
+  }
+
+  LIBC_INLINE constexpr static size_t offset_to_groups() {
+    size_t header_size = sizeof(HashTable);
+    return header_size + SafeMemSize::offset_to(header_size, table_alignment());
+  }
+
+  LIBC_INLINE ENTRY &entry(size_t i) {
+    return reinterpret_cast<ENTRY *>(this)[-i - 1];
+  }
+
+  LIBC_INLINE const ENTRY &entry(size_t i) const {
+    return reinterpret_cast<const ENTRY *>(this)[-i - 1];
+  }
+
+  LIBC_INLINE uint8_t &control(size_t i) {
+    uint8_t *ptr = reinterpret_cast<uint8_t *>(this) + offset_to_groups();
+    return ptr[i];
+  }
+
+  LIBC_INLINE const uint8_t &control(size_t i) const {
+    const uint8_t *ptr =
+        reinterpret_cast<const uint8_t *>(this) + offset_to_groups();
+    return ptr[i];
+  }
+
+  // We duplicate a group of control bytes to the end. Thus, it is possible that
+  // we need to set two control bytes at the same time.
+  LIBC_INLINE void set_ctrl(size_t index, uint8_t value) {
+    size_t index2 = ((index - sizeof(Group)) & entries_mask) + sizeof(Group);
+    control(index) = value;
+    control(index2) = value;
+  }
+
+  LIBC_INLINE size_t find(const char *key, uint64_t primary) {
+    uint8_t secondary = secondary_hash(primary);
+    ProbeSequence sequence{static_cast<size_t>(primary), 0, entries_mask};
+    while (true) {
+      size_t pos = sequence.next();
+      Group ctrls = Group::load(&control(pos));
+      IteratableBitMask masks = ctrls.match_byte(secondary);
+      for (size_t i : masks) {
+        size_t index = (pos + i) & entries_mask;
+        ENTRY &entry = this->entry(index);
+        auto comp = [](char l, char r) -> int { return l - r; };
+        if (LIBC_LIKELY(entry.key != nullptr &&
+                        inline_strcmp(entry.key, key, comp) == 0))
+          return index;
+      }
+      BitMask available = ctrls.mask_available();
+      // Since there is no deletion, the first time we find an available slot
+      // it is also ready to be used as an insertion point. Therefore, we also
+      // return the first available slot we find. If such entry is empty, the
+      // key will be nullptr.
+      if (LIBC_LIKELY(available.any_bit_set())) {
+        size_t index =
+            (pos + available.lowest_set_bit_nonzero()) & entries_mask;
+        return index;
+      }
+    }
+  }
+
+  LIBC_INLINE uint64_t oneshot_hash(const char *key) const {
+    LIBC_NAMESPACE::internal::HashState hasher = state;
+    hasher.update(key, internal::string_length(key));
+    return hasher.finish();
+  }
+
+  // A fast insertion routine without checking if a key already exists.
+  // Nor does the routine check if the table is full.
+  // This is only to be used in grow() where we insert all existing entries
+  // into a new table. Hence, the requirements are naturally satisfied.
+  LIBC_INLINE ENTRY *unsafe_insert(ENTRY item) {
+    uint64_t primary = oneshot_hash(item.key);
+    uint8_t secondary = secondary_hash(primary);
+    ProbeSequence sequence{static_cast<size_t>(primary), 0, entries_mask};
+    while (true) {
+      size_t pos = sequence.next();
+      Group ctrls = Group::load(&control(pos));
+      BitMask available = ctrls.mask_available();
+      if (available.any_bit_set()) {
+        size_t index =
+            (pos + available.lowest_set_bit_nonzero()) & entries_mask;
+        set_ctrl(index, secondary);
+        entry(index).key = item.key;
+        entry(index).data = item.data;
+        available_slots--;
+        return &entry(index);
+      }
+    }
+  }
+
+  LIBC_INLINE HashTable *grow() const {
+    size_t hint = full_capacity() + 1;
+    HashState state = this->state;
+    // migrate to a new random state
+    state.update(&hint, sizeof(hint));
+    HashTable *new_table = allocate(hint, state.finish());
+    // It is safe to call unsafe_insert() because we know that:
+    // - the new table has enough capacity to hold all the entries
+    // - there is no duplicate key in the old table
+    if (new_table != nullptr)
+      for (ENTRY e : *this)
+        new_table->unsafe_insert(e);
+    return new_table;
+  }
+
+  LIBC_INLINE static ENTRY *insert(HashTable *&table, ENTRY item,
+                                   uint64_t primary) {
+    auto index = table->find(item.key, primary);
+    auto slot = &table->entry(index);
+    // SVr4 and POSIX.1-2001 specify that action is significant only for
+    // unsuccessful searches, so that an ENTER should not do anything
+    // for a successful search.
+    if (slot->key != nullptr)
+      return slot;
+
+    // if table of full, we try to grow the table
+    if (table->is_full()) {
+      HashTable *new_table = table->grow();
+      // allocation failed, return nullptr to indicate failure
+      if (new_table == nullptr)
+        return nullptr;
+      // resized sccuessfully: clean up the old table and use the new one
+      deallocate(table);
+      table = new_table;
+      // it is still valid to use the fastpath insertion.
+      return table->unsafe_insert(item);
+    }
+
+    table->set_ctrl(index, secondary_hash(primary));
+    slot->key = item.key;
+    slot->data = item.data;
+    table->available_slots--;
+    return slot;
+  }
+
+public:
+  LIBC_INLINE static void deallocate(HashTable *table) {
+    if (table) {
+      void *ptr =
+          reinterpret_cast<uint8_t *>(table) - table->offset_from_entries();
+      operator delete(ptr, std::align_val_t{table_alignment()});
+    }
+  }
+
+  LIBC_INLINE static HashTable *allocate(size_t capacity, uint64_t randomness) {
+    // check if capacity_to_entries overflows MAX_MEM_SIZE
+    if (capacity > size_t{1} << (8 * sizeof(size_t) - 1 - 3))
+      return nullptr;
+    SafeMemSize entries{capacity_to_entries(capacity)};
+    SafeMemSize entries_size = entries * SafeMemSize{sizeof(ENTRY)};
+    SafeMemSize align_boundary = entries_size.align_up(table_alignment());
+    SafeMemSize ctrl_sizes = entries + SafeMemSize{sizeof(Group)};
+    SafeMemSize header_size{offset_to_groups()};
+    SafeMemSize total_size =
+        (align_boundary + header_size + ctrl_sizes).align_up(table_alignment());
+    if (!total_size.valid())
+      return nullptr;
+    AllocChecker ac;
+
+    void *mem = operator new(total_size, std::align_val_t{table_alignment()},
+                             ac);
+
+    HashTable *table = reinterpret_cast<HashTable *>(
+        static_cast<uint8_t *>(mem) + align_boundary);
+    if (ac) {
+      table->entries_mask = entries - 1u;
+      table->available_slots = entries / 8 * 7;
+      table->state = HashState{randomness};
+      __builtin_memset(&table->control(0), 0x80, ctrl_sizes);
+      __builtin_memset(mem, 0, table->offset_from_entries());
+    }
+    return table;
+  }
+
+  struct FullTableIterator {
+    size_t current_offset;
+    size_t remaining;
+    IteratableBitMask current_mask;
+    const HashTable &table;
+
+    // It is fine to use remaining to represent the iterator:
+    // - this comparison only happens with the same table
+    // - hashtable will not be mutated during the iteration
+    LIBC_INLINE bool operator==(const FullTableIterator &other) const {
+      return remaining == other.remaining;
+    }
+    LIBC_INLINE bool operator!=(const FullTableIterator &other) const {
+      return remaining != other.remaining;
+    }
+
+    LIBC_INLINE FullTableIterator &operator++() {
+      this->ensure_valid_group();
+      current_mask.remove_lowest_bit();
+      remaining--;
+      return *this;
+    }
+    LIBC_INLINE const ENTRY &operator*() {
+      this->ensure_valid_group();
+      return table.entry(
+          (current_offset + current_mask.lowest_set_bit_nonzero()) &
+          table.entries_mask);
+    }
+
+  private:
+    LIBC_INLINE void ensure_valid_group() {
+      while (!current_mask.any_bit_set()) {
+        current_offset += sizeof(Group);
+        // It is ensured that the load will only happen at aligned boundaries.
+        current_mask =
+            Group::load_aligned(&table.control(current_offset)).occupied();
+      }
+    }
+  };
+
+  using value_type = ENTRY;
+  using iterator = FullTableIterator;
+  iterator begin() const {
+    return {0, full_capacity() - available_slots,
+            Group::load_aligned(&control(0)).occupied(), *this};
+  }
+  iterator end() const { return {0, 0, {BitMask{0}}, *this}; }
+
+  LIBC_INLINE ENTRY *find(const char *key) {
+    uint64_t primary = oneshot_hash(key);
+    ENTRY &entry = this->entry(find(key, primary));
+    if (entry.key == nullptr)
+      return nullptr;
+    return &entry;
+  }
+
+  LIBC_INLINE static ENTRY *insert(HashTable *&table, ENTRY item) {
+    uint64_t primary = table->oneshot_hash(item.key);
+    return insert(table, item, primary);
+  }
+};
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_HASHTABLE_TABLE_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/baremetal/exit.cpp b/contrib/llvm-project/libc/src/__support/OSUtil/baremetal/exit.cpp
new file mode 100644
index 000000000000..64d3862422b6
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/baremetal/exit.cpp
@@ -0,0 +1,21 @@
+//===-------- Baremetal implementation of an exit function ------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/__support/OSUtil/exit.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+// This is intended to be provided by the vendor.
+extern "C" [[noreturn]] void __llvm_libc_exit(int status);
+
+[[noreturn]] void exit(int status) { __llvm_libc_exit(status); }
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/baremetal/io.cpp b/contrib/llvm-project/libc/src/__support/OSUtil/baremetal/io.cpp
new file mode 100644
index 000000000000..2a9ef6bfa657
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/baremetal/io.cpp
@@ -0,0 +1,70 @@
+//===---------- Baremetal implementation of IO utils ------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "io.h"
+
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+// These are intended to be provided by the vendor.
+//
+// The signature of these types and functions intentionally match `fopencookie`
+// which allows the following:
+//
+// ```
+// struct __llvm_libc_stdio_cookie { ... };
+// ...
+// struct __llvm_libc_stdio_cookie __llvm_libc_stdin_cookie;
+// cookie_io_functions_t stdin_func = { .read = __llvm_libc_stdio_read };
+// FILE *stdin = fopencookie(&__llvm_libc_stdin_cookie, "r", stdin_func);
+// ...
+// struct __llvm_libc_stdio_cookie __llvm_libc_stdout_cookie;
+// cookie_io_functions_t stdout_func = { .write = __llvm_libc_stdio_write };
+// FILE *stdout = fopencookie(&__llvm_libc_stdout_cookie, "w", stdout_func);
+// ...
+// struct __llvm_libc_stdio_cookie __llvm_libc_stderr_cookie;
+// cookie_io_functions_t stderr_func = { .write = __llvm_libc_stdio_write };
+// FILE *stderr = fopencookie(&__llvm_libc_stderr_cookie, "w", stderr_func);
+// ```
+//
+// At the same time, implementation of functions like `printf` and `scanf` can
+// use `__llvm_libc_stdio_read` and `__llvm_libc_stdio_write` directly to avoid
+// the extra indirection.
+//
+// All three symbols `__llvm_libc_stdin_cookie`, `__llvm_libc_stdout_cookie`,
+// and `__llvm_libc_stderr_cookie` must be provided, even if they don't point
+// at anything.
+
+struct __llvm_libc_stdio_cookie;
+
+extern "C" struct __llvm_libc_stdio_cookie __llvm_libc_stdin_cookie;
+extern "C" struct __llvm_libc_stdio_cookie __llvm_libc_stdout_cookie;
+extern "C" struct __llvm_libc_stdio_cookie __llvm_libc_stderr_cookie;
+
+extern "C" ssize_t __llvm_libc_stdio_read(void *cookie, char *buf, size_t size);
+extern "C" ssize_t __llvm_libc_stdio_write(void *cookie, const char *buf,
+                                           size_t size);
+
+ssize_t read_from_stdin(char *buf, size_t size) {
+  return __llvm_libc_stdio_read(static_cast<void *>(&__llvm_libc_stdin_cookie),
+                                buf, size);
+}
+
+void write_to_stdout(cpp::string_view msg) {
+  __llvm_libc_stdio_write(static_cast<void *>(&__llvm_libc_stdout_cookie),
+                          msg.data(), msg.size());
+}
+
+void write_to_stderr(cpp::string_view msg) {
+  __llvm_libc_stdio_write(static_cast<void *>(&__llvm_libc_stderr_cookie),
+                          msg.data(), msg.size());
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/baremetal/io.h b/contrib/llvm-project/libc/src/__support/OSUtil/baremetal/io.h
new file mode 100644
index 000000000000..aed34ec7e62e
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/baremetal/io.h
@@ -0,0 +1,25 @@
+//===---------- Baremetal implementation of IO utils ------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_BAREMETAL_IO_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_BAREMETAL_IO_H
+
+#include "include/llvm-libc-types/size_t.h"
+#include "include/llvm-libc-types/ssize_t.h"
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+ssize_t read_from_stdin(char *buf, size_t size);
+void write_to_stderr(cpp::string_view msg);
+void write_to_stdout(cpp::string_view msg);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_BAREMETAL_IO_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/darwin/aarch64/syscall.h b/contrib/llvm-project/libc/src/__support/OSUtil/darwin/aarch64/syscall.h
new file mode 100644
index 000000000000..dc98c07a8ba3
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/darwin/aarch64/syscall.h
@@ -0,0 +1,113 @@
+//===------ inline implementation of Darwin arm64 syscalls --------* C++ *-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_DARWIN_ARM_SYSCALL_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_DARWIN_ARM_SYSCALL_H
+
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+#define REGISTER_DECL_0                                                        \
+  register long x16 __asm__("x16") = number;                                   \
+  register long x0 __asm__("x0");
+#define REGISTER_DECL_1                                                        \
+  register long x16 __asm__("x16") = number;                                   \
+  register long x0 __asm__("x0") = arg1;
+#define REGISTER_DECL_2                                                        \
+  REGISTER_DECL_1                                                              \
+  register long x1 __asm__("x1") = arg2;
+#define REGISTER_DECL_3                                                        \
+  REGISTER_DECL_2                                                              \
+  register long x2 __asm__("x2") = arg3;
+#define REGISTER_DECL_4                                                        \
+  REGISTER_DECL_3                                                              \
+  register long x3 __asm__("x3") = arg4;
+#define REGISTER_DECL_5                                                        \
+  REGISTER_DECL_4                                                              \
+  register long x4 __asm__("x4") = arg5;
+#define REGISTER_DECL_6                                                        \
+  REGISTER_DECL_5                                                              \
+  register long x5 __asm__("x5") = arg6;
+
+#define REGISTER_CONSTRAINT_0 "r"(x16)
+#define REGISTER_CONSTRAINT_1 REGISTER_CONSTRAINT_0, "r"(x0)
+#define REGISTER_CONSTRAINT_2 REGISTER_CONSTRAINT_1, "r"(x1)
+#define REGISTER_CONSTRAINT_3 REGISTER_CONSTRAINT_2, "r"(x2)
+#define REGISTER_CONSTRAINT_4 REGISTER_CONSTRAINT_3, "r"(x3)
+#define REGISTER_CONSTRAINT_5 REGISTER_CONSTRAINT_4, "r"(x4)
+#define REGISTER_CONSTRAINT_6 REGISTER_CONSTRAINT_5, "r"(x5)
+
+#define SYSCALL_INSTR(input_constraint)                                        \
+  LIBC_INLINE_ASM("svc 0x80" : "=r"(x0) : input_constraint : "memory", "cc")
+
+namespace LIBC_NAMESPACE_DECL {
+
+LIBC_INLINE long syscall_impl(long number) {
+  REGISTER_DECL_0;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_0);
+  return x0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1) {
+  REGISTER_DECL_1;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_1);
+  return x0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2) {
+  REGISTER_DECL_2;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_2);
+  return x0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3) {
+  REGISTER_DECL_3;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_3);
+  return x0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3,
+                              long arg4) {
+  REGISTER_DECL_4;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_4);
+  return x0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3,
+                              long arg4, long arg5) {
+  REGISTER_DECL_5;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_5);
+  return x0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3,
+                              long arg4, long arg5, long arg6) {
+  REGISTER_DECL_6;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_6);
+  return x0;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#undef REGISTER_DECL_0
+#undef REGISTER_DECL_1
+#undef REGISTER_DECL_2
+#undef REGISTER_DECL_3
+#undef REGISTER_DECL_4
+#undef REGISTER_DECL_5
+#undef REGISTER_DECL_6
+
+#undef REGISTER_CONSTRAINT_0
+#undef REGISTER_CONSTRAINT_1
+#undef REGISTER_CONSTRAINT_2
+#undef REGISTER_CONSTRAINT_3
+#undef REGISTER_CONSTRAINT_4
+#undef REGISTER_CONSTRAINT_5
+#undef REGISTER_CONSTRAINT_6
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_DARWIN_ARM_SYSCALL_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/darwin/io.h b/contrib/llvm-project/libc/src/__support/OSUtil/darwin/io.h
new file mode 100644
index 000000000000..69df99da522f
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/darwin/io.h
@@ -0,0 +1,26 @@
+//===------------- Darwin implementation of IO utils ------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_DARWIN_IO_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_DARWIN_IO_H
+
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/macros/config.h"
+#include "syscall.h" // For internal syscall function.
+
+namespace LIBC_NAMESPACE_DECL {
+
+LIBC_INLINE void write_to_stderr(cpp::string_view msg) {
+  LIBC_NAMESPACE::syscall_impl(4 /*SYS_write*/, 2 /* stderr */,
+                               reinterpret_cast<long>(msg.data()),
+                               static_cast<long>(msg.size()));
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_DARWIN_IO_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/darwin/syscall.h b/contrib/llvm-project/libc/src/__support/OSUtil/darwin/syscall.h
new file mode 100644
index 000000000000..463407dbe19e
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/darwin/syscall.h
@@ -0,0 +1,33 @@
+//===---------------------- Darwin syscalls ---------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_DARWIN_SYSCALL_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_DARWIN_SYSCALL_H
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+
+#ifdef LIBC_TARGET_ARCH_IS_ANY_ARM
+#include "aarch64/syscall.h"
+#else
+#error "Unsupported architecture"
+#endif
+
+namespace LIBC_NAMESPACE_DECL {
+
+template <typename R, typename... Ts>
+LIBC_INLINE R syscall_impl(long __number, Ts... ts) {
+  static_assert(sizeof...(Ts) <= 6, "Too many arguments for syscall");
+  return cpp::bit_or_static_cast<R>(syscall_impl(__number, (long)ts...));
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_DARWIN_SYSCALL_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/exit.h b/contrib/llvm-project/libc/src/__support/OSUtil/exit.h
new file mode 100644
index 000000000000..e784ca0cb00b
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/exit.h
@@ -0,0 +1,22 @@
+//===------------ Implementation of an exit function ------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_EXIT_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_EXIT_H
+
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+[[noreturn]] void exit(int status);
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_EXIT_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/fcntl.h b/contrib/llvm-project/libc/src/__support/OSUtil/fcntl.h
new file mode 100644
index 000000000000..3983d78f7f89
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/fcntl.h
@@ -0,0 +1,27 @@
+//===-- Implementation header of internal fcntl function ------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_FCNTL_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_FCNTL_H
+
+#include "hdr/types/mode_t.h"
+#include "src/__support/error_or.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+ErrorOr<int> fcntl(int fd, int cmd, void *arg = nullptr);
+
+ErrorOr<int> open(const char *path, int flags, mode_t mode_flags = 0);
+
+ErrorOr<int> close(int fd);
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_FCNTL_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/fuchsia/io.h b/contrib/llvm-project/libc/src/__support/OSUtil/fuchsia/io.h
new file mode 100644
index 000000000000..3953afce079d
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/fuchsia/io.h
@@ -0,0 +1,34 @@
+//===------------- Fuchsia implementation of IO utils -----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_FUCHSIA_IO_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_FUCHSIA_IO_H
+
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/macros/config.h"
+
+#include <iostream>
+#include <zircon/sanitizer.h>
+
+namespace LIBC_NAMESPACE_DECL {
+
+LIBC_INLINE void write_to_stderr(cpp::string_view msg) {
+#if defined(LIBC_COPT_TEST_USE_ZXTEST)
+  // This is used in standalone context where there is nothing like POSIX I/O.
+  __sanitizer_log_write(msg.data(), msg.size());
+#elif defined(LIBC_COPT_TEST_USE_GTEST)
+  // The gtest framework already relies on full standard C++ I/O via fdio.
+  std::cerr << std::string_view{msg.data(), msg.size()};
+#else
+#error this file should only be used by tests
+#endif
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_FUCHSIA_IO_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/gpu/exit.cpp b/contrib/llvm-project/libc/src/__support/OSUtil/gpu/exit.cpp
new file mode 100644
index 000000000000..85f8183aafa9
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/gpu/exit.cpp
@@ -0,0 +1,33 @@
+//===------------- GPU implementation of an exit function -------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/__support/OSUtil/exit.h"
+
+#include "src/__support/GPU/utils.h"
+#include "src/__support/RPC/rpc_client.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+[[noreturn]] void exit(int status) {
+  // We want to first make sure the server is listening before we exit.
+  rpc::Client::Port port = rpc::client.open<LIBC_EXIT>();
+  port.send_and_recv([](rpc::Buffer *, uint32_t) {},
+                     [](rpc::Buffer *, uint32_t) {});
+  port.send([&](rpc::Buffer *buffer, uint32_t) {
+    reinterpret_cast<uint32_t *>(buffer->data)[0] = status;
+  });
+  port.close();
+
+  gpu::end_program();
+}
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/gpu/io.cpp b/contrib/llvm-project/libc/src/__support/OSUtil/gpu/io.cpp
new file mode 100644
index 000000000000..5d107ab50ae8
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/gpu/io.cpp
@@ -0,0 +1,24 @@
+//===-------------- GPU implementation of IO utils --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "io.h"
+
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/RPC/rpc_client.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+void write_to_stderr(cpp::string_view msg) {
+  rpc::Client::Port port = rpc::client.open<LIBC_WRITE_TO_STDERR>();
+  port.send_n(msg.data(), msg.size());
+  port.recv([](rpc::Buffer *, uint32_t) { /* void */ });
+  port.close();
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/gpu/io.h b/contrib/llvm-project/libc/src/__support/OSUtil/gpu/io.h
new file mode 100644
index 000000000000..e23db8acdaec
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/gpu/io.h
@@ -0,0 +1,22 @@
+//===-------------- GPU implementation of IO utils --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_GPU_IO_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_GPU_IO_H
+
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+void write_to_stderr(cpp::string_view msg);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_GPU_IO_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/io.h b/contrib/llvm-project/libc/src/__support/OSUtil/io.h
new file mode 100644
index 000000000000..66af31f3cc8c
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/io.h
@@ -0,0 +1,31 @@
+//===---------------- Implementation of IO utils ----------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_IO_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_IO_H
+
+#include "src/__support/macros/properties/architectures.h"
+
+#if defined(LIBC_TARGET_ARCH_IS_GPU)
+#include "gpu/io.h"
+#elif defined(__APPLE__)
+#include "darwin/io.h"
+#elif defined(__linux__)
+#include "linux/io.h"
+#elif defined(__Fuchsia__)
+#include "fuchsia/io.h"
+#elif defined(_WIN32)
+#include "windows/io.h"
+#elif defined(__ELF__)
+// TODO: Ideally we would have LIBC_TARGET_OS_IS_BAREMETAL.
+#include "baremetal/io.h"
+#elif defined(__UEFI__)
+#include "uefi/io.h"
+#endif
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_IO_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/linux/aarch64/syscall.h b/contrib/llvm-project/libc/src/__support/OSUtil/linux/aarch64/syscall.h
new file mode 100644
index 000000000000..f28392de5dce
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/linux/aarch64/syscall.h
@@ -0,0 +1,111 @@
+//===--------- inline implementation of aarch64 syscalls ----------* C++ *-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_AARCH64_SYSCALL_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_AARCH64_SYSCALL_H
+
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+#define REGISTER_DECL_0                                                        \
+  register long x8 __asm__("x8") = number;                                     \
+  register long x0 __asm__("x0");
+#define REGISTER_DECL_1                                                        \
+  register long x8 __asm__("x8") = number;                                     \
+  register long x0 __asm__("x0") = arg1;
+#define REGISTER_DECL_2 REGISTER_DECL_1 register long x1 __asm__("x1") = arg2;
+#define REGISTER_DECL_3                                                        \
+  REGISTER_DECL_2                                                              \
+  register long x2 __asm__("x2") = arg3;
+#define REGISTER_DECL_4                                                        \
+  REGISTER_DECL_3                                                              \
+  register long x3 __asm__("x3") = arg4;
+#define REGISTER_DECL_5                                                        \
+  REGISTER_DECL_4                                                              \
+  register long x4 __asm__("x4") = arg5;
+#define REGISTER_DECL_6                                                        \
+  REGISTER_DECL_5                                                              \
+  register long x5 __asm__("x5") = arg6;
+
+#define REGISTER_CONSTRAINT_0 "r"(x8)
+#define REGISTER_CONSTRAINT_1 REGISTER_CONSTRAINT_0, "r"(x0)
+#define REGISTER_CONSTRAINT_2 REGISTER_CONSTRAINT_1, "r"(x1)
+#define REGISTER_CONSTRAINT_3 REGISTER_CONSTRAINT_2, "r"(x2)
+#define REGISTER_CONSTRAINT_4 REGISTER_CONSTRAINT_3, "r"(x3)
+#define REGISTER_CONSTRAINT_5 REGISTER_CONSTRAINT_4, "r"(x4)
+#define REGISTER_CONSTRAINT_6 REGISTER_CONSTRAINT_5, "r"(x5)
+
+#define SYSCALL_INSTR(input_constraint)                                        \
+  LIBC_INLINE_ASM("svc 0" : "=r"(x0) : input_constraint : "memory", "cc")
+
+namespace LIBC_NAMESPACE_DECL {
+
+LIBC_INLINE long syscall_impl(long number) {
+  REGISTER_DECL_0;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_0);
+  return x0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1) {
+  REGISTER_DECL_1;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_1);
+  return x0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2) {
+  REGISTER_DECL_2;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_2);
+  return x0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3) {
+  REGISTER_DECL_3;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_3);
+  return x0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3,
+                              long arg4) {
+  REGISTER_DECL_4;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_4);
+  return x0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3,
+                              long arg4, long arg5) {
+  REGISTER_DECL_5;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_5);
+  return x0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3,
+                              long arg4, long arg5, long arg6) {
+  REGISTER_DECL_6;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_6);
+  return x0;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#undef REGISTER_DECL_0
+#undef REGISTER_DECL_1
+#undef REGISTER_DECL_2
+#undef REGISTER_DECL_3
+#undef REGISTER_DECL_4
+#undef REGISTER_DECL_5
+#undef REGISTER_DECL_6
+
+#undef REGISTER_CONSTRAINT_0
+#undef REGISTER_CONSTRAINT_1
+#undef REGISTER_CONSTRAINT_2
+#undef REGISTER_CONSTRAINT_3
+#undef REGISTER_CONSTRAINT_4
+#undef REGISTER_CONSTRAINT_5
+#undef REGISTER_CONSTRAINT_6
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_AARCH64_SYSCALL_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/linux/aarch64/vdso.h b/contrib/llvm-project/libc/src/__support/OSUtil/linux/aarch64/vdso.h
new file mode 100644
index 000000000000..3c4c6205071d
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/linux/aarch64/vdso.h
@@ -0,0 +1,37 @@
+//===---------- aarch64 vdso configuration ------------------------* C++ *-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_AARCH64_VDSO_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_AARCH64_VDSO_H
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/OSUtil/linux/vdso_sym.h"
+namespace LIBC_NAMESPACE_DECL {
+namespace vdso {
+// translate VDSOSym to symbol names
+// https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/kernel/vdso/vdso.lds.S
+LIBC_INLINE constexpr cpp::string_view symbol_name(VDSOSym sym) {
+  switch (sym) {
+  case VDSOSym::RTSigReturn:
+    return "__kernel_rt_sigreturn";
+  case VDSOSym::GetTimeOfDay:
+    return "__kernel_gettimeofday";
+  case VDSOSym::ClockGetTime:
+    return "__kernel_clock_gettime";
+  case VDSOSym::ClockGetRes:
+    return "__kernel_clock_getres";
+  default:
+    return "";
+  }
+}
+
+// symbol versions
+LIBC_INLINE constexpr cpp::string_view symbol_version(VDSOSym) {
+  return "LINUX_2.6.39";
+}
+} // namespace vdso
+} // namespace LIBC_NAMESPACE_DECL
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_AARCH64_VDSO_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/linux/arm/syscall.h b/contrib/llvm-project/libc/src/__support/OSUtil/linux/arm/syscall.h
new file mode 100644
index 000000000000..d1058c84281f
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/linux/arm/syscall.h
@@ -0,0 +1,129 @@
+//===--------- inline implementation of arm syscalls --------------* C++ *-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_ARM_SYSCALL_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_ARM_SYSCALL_H
+
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+#ifdef __thumb__
+#define R7 long r7 = number
+#define SYSCALL_INSTR(input_constraint)                                        \
+  int temp;                                                                    \
+  LIBC_INLINE_ASM(R"(
+    mov %[temp], r7
+    mov r7, %2
+    svc #0
+    mov r7, %[temp]
+  )"                                                          \
+                  : "=r"(r0), [temp] "=&r"(temp)                               \
+                  : input_constraint                                           \
+                  : "memory", "cc")
+#else
+#define R7 register long r7 asm("r7") = number
+#define SYSCALL_INSTR(input_constraint)                                        \
+  LIBC_INLINE_ASM("svc 0" : "=r"(r0) : input_constraint : "memory", "cc")
+#endif
+
+#define REGISTER_DECL_0                                                        \
+  R7;                                                                          \
+  register long r0 __asm__("r0");
+#define REGISTER_DECL_1                                                        \
+  R7;                                                                          \
+  register long r0 __asm__("r0") = arg1;
+#define REGISTER_DECL_2                                                        \
+  REGISTER_DECL_1                                                              \
+  register long r1 __asm__("r1") = arg2;
+#define REGISTER_DECL_3                                                        \
+  REGISTER_DECL_2                                                              \
+  register long r2 __asm__("r2") = arg3;
+#define REGISTER_DECL_4                                                        \
+  REGISTER_DECL_3                                                              \
+  register long r3 __asm__("r3") = arg4;
+#define REGISTER_DECL_5                                                        \
+  REGISTER_DECL_4                                                              \
+  register long r4 __asm__("r4") = arg5;
+#define REGISTER_DECL_6                                                        \
+  REGISTER_DECL_5                                                              \
+  register long r5 __asm__("r5") = arg6;
+
+#define REGISTER_CONSTRAINT_0 "r"(r7)
+#define REGISTER_CONSTRAINT_1 REGISTER_CONSTRAINT_0, "r"(r0)
+#define REGISTER_CONSTRAINT_2 REGISTER_CONSTRAINT_1, "r"(r1)
+#define REGISTER_CONSTRAINT_3 REGISTER_CONSTRAINT_2, "r"(r2)
+#define REGISTER_CONSTRAINT_4 REGISTER_CONSTRAINT_3, "r"(r3)
+#define REGISTER_CONSTRAINT_5 REGISTER_CONSTRAINT_4, "r"(r4)
+#define REGISTER_CONSTRAINT_6 REGISTER_CONSTRAINT_5, "r"(r5)
+
+namespace LIBC_NAMESPACE_DECL {
+
+LIBC_INLINE long syscall_impl(long number) {
+  REGISTER_DECL_0;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_0);
+  return r0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1) {
+  REGISTER_DECL_1;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_1);
+  return r0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2) {
+  REGISTER_DECL_2;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_2);
+  return r0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3) {
+  REGISTER_DECL_3;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_3);
+  return r0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3,
+                              long arg4) {
+  REGISTER_DECL_4;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_4);
+  return r0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3,
+                              long arg4, long arg5) {
+  REGISTER_DECL_5;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_5);
+  return r0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3,
+                              long arg4, long arg5, long arg6) {
+  REGISTER_DECL_6;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_6);
+  return r0;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#undef REGISTER_DECL_0
+#undef REGISTER_DECL_1
+#undef REGISTER_DECL_2
+#undef REGISTER_DECL_3
+#undef REGISTER_DECL_4
+#undef REGISTER_DECL_5
+#undef REGISTER_DECL_6
+
+#undef REGISTER_CONSTRAINT_0
+#undef REGISTER_CONSTRAINT_1
+#undef REGISTER_CONSTRAINT_2
+#undef REGISTER_CONSTRAINT_3
+#undef REGISTER_CONSTRAINT_4
+#undef REGISTER_CONSTRAINT_5
+#undef REGISTER_CONSTRAINT_6
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_ARM_SYSCALL_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/linux/arm/vdso.h b/contrib/llvm-project/libc/src/__support/OSUtil/linux/arm/vdso.h
new file mode 100644
index 000000000000..3de5860359c1
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/linux/arm/vdso.h
@@ -0,0 +1,37 @@
+//===---------- arm vdso configuration ----------------------------* C++ *-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_ARM_VDSO_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_ARM_VDSO_H
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/OSUtil/linux/vdso_sym.h"
+namespace LIBC_NAMESPACE_DECL {
+namespace vdso {
+// translate VDSOSym to symbol names
+// https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/vdso/vdso.lds.S
+LIBC_INLINE constexpr cpp::string_view symbol_name(VDSOSym sym) {
+  switch (sym) {
+  case VDSOSym::ClockGetTime:
+    return "__vdso_clock_gettime";
+  case VDSOSym::GetTimeOfDay:
+    return "__vdso_gettimeofday";
+  case VDSOSym::ClockGetRes:
+    return "__vdso_clock_getres";
+  case VDSOSym::ClockGetTime64:
+    return "__vdso_clock_gettime64";
+  default:
+    return "";
+  }
+}
+
+// symbol versions
+LIBC_INLINE constexpr cpp::string_view symbol_version(VDSOSym) {
+  return "LINUX_2.6";
+}
+} // namespace vdso
+} // namespace LIBC_NAMESPACE_DECL
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_ARM_VDSO_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/linux/exit.cpp b/contrib/llvm-project/libc/src/__support/OSUtil/linux/exit.cpp
new file mode 100644
index 000000000000..e26b90f6b18e
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/linux/exit.cpp
@@ -0,0 +1,31 @@
+//===------------ Linux implementation of an exit function ------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/__support/OSUtil/linux/syscall.h" // syscall_impl
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include <sys/syscall.h> // For syscall numbers.
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+// mark as no_stack_protector for x86 since TLS can be torn down before calling
+// exit so that the stack protector canary cannot be loaded.
+#ifdef LIBC_TARGET_ARCH_IS_X86
+__attribute__((no_stack_protector))
+#endif
+__attribute__((noreturn)) void
+exit(int status) {
+  for (;;) {
+    LIBC_NAMESPACE::syscall_impl<long>(SYS_exit_group, status);
+    LIBC_NAMESPACE::syscall_impl<long>(SYS_exit, status);
+  }
+}
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/linux/fcntl.cpp b/contrib/llvm-project/libc/src/__support/OSUtil/linux/fcntl.cpp
new file mode 100644
index 000000000000..bb76eee90efd
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/linux/fcntl.cpp
@@ -0,0 +1,142 @@
+//===-- Implementation of internal fcntl ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/__support/OSUtil/fcntl.h"
+
+#include "hdr/errno_macros.h"
+#include "hdr/fcntl_macros.h"
+#include "hdr/types/mode_t.h"
+#include "hdr/types/off_t.h"
+#include "hdr/types/struct_f_owner_ex.h"
+#include "hdr/types/struct_flock.h"
+#include "hdr/types/struct_flock64.h"
+#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
+#include "src/__support/common.h"
+#include "src/__support/error_or.h"
+#include "src/__support/macros/config.h"
+
+#include <sys/syscall.h> // For syscall numbers.
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+ErrorOr<int> fcntl(int fd, int cmd, void *arg) {
+#if SYS_fcntl
+  constexpr auto FCNTL_SYSCALL_ID = SYS_fcntl;
+#elif defined(SYS_fcntl64)
+  constexpr auto FCNTL_SYSCALL_ID = SYS_fcntl64;
+#else
+#error "fcntl and fcntl64 syscalls not available."
+#endif
+
+  switch (cmd) {
+  case F_OFD_SETLKW: {
+    struct flock *flk = reinterpret_cast<struct flock *>(arg);
+    // convert the struct to a flock64
+    struct flock64 flk64;
+    flk64.l_type = flk->l_type;
+    flk64.l_whence = flk->l_whence;
+    flk64.l_start = flk->l_start;
+    flk64.l_len = flk->l_len;
+    flk64.l_pid = flk->l_pid;
+    // create a syscall
+    int ret =
+        LIBC_NAMESPACE::syscall_impl<int>(FCNTL_SYSCALL_ID, fd, cmd, &flk64);
+    if (ret < 0)
+      return Error(-ret);
+    return ret;
+  }
+  case F_OFD_GETLK:
+  case F_OFD_SETLK: {
+    struct flock *flk = reinterpret_cast<struct flock *>(arg);
+    // convert the struct to a flock64
+    struct flock64 flk64;
+    flk64.l_type = flk->l_type;
+    flk64.l_whence = flk->l_whence;
+    flk64.l_start = flk->l_start;
+    flk64.l_len = flk->l_len;
+    flk64.l_pid = flk->l_pid;
+    // create a syscall
+    int ret =
+        LIBC_NAMESPACE::syscall_impl<int>(FCNTL_SYSCALL_ID, fd, cmd, &flk64);
+    // On failure, return
+    if (ret < 0)
+      return Error(-1);
+    // Check for overflow, i.e. the offsets are not the same when cast
+    // to off_t from off64_t.
+    if (static_cast<off_t>(flk64.l_len) != flk64.l_len ||
+        static_cast<off_t>(flk64.l_start) != flk64.l_start)
+      return Error(EOVERFLOW);
+
+    // Now copy back into flk, in case flk64 got modified
+    flk->l_type = flk64.l_type;
+    flk->l_whence = flk64.l_whence;
+    flk->l_start = static_cast<decltype(flk->l_start)>(flk64.l_start);
+    flk->l_len = static_cast<decltype(flk->l_len)>(flk64.l_len);
+    flk->l_pid = flk64.l_pid;
+    return ret;
+  }
+  case F_GETOWN: {
+    struct f_owner_ex fex;
+    int ret = LIBC_NAMESPACE::syscall_impl<int>(FCNTL_SYSCALL_ID, fd,
+                                                F_GETOWN_EX, &fex);
+    if (ret < 0)
+      return Error(-ret);
+    return fex.type == F_OWNER_PGRP ? -fex.pid : fex.pid;
+  }
+#ifdef SYS_fcntl64
+  case F_GETLK: {
+    if constexpr (FCNTL_SYSCALL_ID == SYS_fcntl64)
+      cmd = F_GETLK64;
+    break;
+  }
+  case F_SETLK: {
+    if constexpr (FCNTL_SYSCALL_ID == SYS_fcntl64)
+      cmd = F_SETLK64;
+    break;
+  }
+  case F_SETLKW: {
+    if constexpr (FCNTL_SYSCALL_ID == SYS_fcntl64)
+      cmd = F_SETLKW64;
+    break;
+  }
+#endif
+  }
+
+  // default, but may use rewritten cmd from above.
+  int ret = LIBC_NAMESPACE::syscall_impl<int>(FCNTL_SYSCALL_ID, fd, cmd,
+                                              reinterpret_cast<void *>(arg));
+  if (ret < 0)
+    return Error(-ret);
+  return ret;
+}
+
+ErrorOr<int> open(const char *path, int flags, mode_t mode_flags) {
+#ifdef SYS_open
+  int fd = LIBC_NAMESPACE::syscall_impl<int>(SYS_open, path, flags, mode_flags);
+#else
+  int fd = LIBC_NAMESPACE::syscall_impl<int>(SYS_openat, AT_FDCWD, path, flags,
+                                             mode_flags);
+#endif
+  if (fd < 0)
+    return Error(-fd);
+
+  return fd;
+}
+
+ErrorOr<int> close(int fd) {
+  int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_close, fd);
+
+  if (ret < 0)
+    return Error(-ret);
+
+  return ret;
+}
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/linux/getrandom.h b/contrib/llvm-project/libc/src/__support/OSUtil/linux/getrandom.h
new file mode 100644
index 000000000000..793639472fee
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/linux/getrandom.h
@@ -0,0 +1,35 @@
+//===------------ Implementation of getrandom function ----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_GETRANDOM_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_GETRANDOM_H
+
+#include "hdr/types/ssize_t.h"
+#include "src/__support/OSUtil/linux/syscall.h" // syscall_impl
+#include "src/__support/common.h"
+#include "src/__support/error_or.h"
+#include "src/__support/macros/config.h"
+#include <sys/syscall.h> // For syscall numbers
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+LIBC_INLINE static ErrorOr<ssize_t> getrandom(void *buf, size_t buflen,
+                                              unsigned int flags) {
+  ssize_t ret =
+      LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_getrandom, buf, buflen, flags);
+  if (ret < 0) {
+    return Error(-static_cast<int>(ret));
+  }
+  return ret;
+}
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_GETRANDOM_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/linux/i386/syscall.h b/contrib/llvm-project/libc/src/__support/OSUtil/linux/i386/syscall.h
new file mode 100644
index 000000000000..88d7f2fb2c49
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/linux/i386/syscall.h
@@ -0,0 +1,88 @@
+//===---------- inline implementation of i386 syscalls ------------* C++ *-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_I386_SYSCALL_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_I386_SYSCALL_H
+
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LIBC_INLINE long syscall_impl(long num) {
+  long ret;
+  LIBC_INLINE_ASM("int $128" : "=a"(ret) : "a"(num) : "memory");
+  return ret;
+}
+
+LIBC_INLINE long syscall_impl(long num, long arg1) {
+  long ret;
+  LIBC_INLINE_ASM("int $128" : "=a"(ret) : "a"(num), "b"(arg1) : "memory");
+  return ret;
+}
+
+LIBC_INLINE long syscall_impl(long num, long arg1, long arg2) {
+  long ret;
+  LIBC_INLINE_ASM("int $128"
+                  : "=a"(ret)
+                  : "a"(num), "b"(arg1), "c"(arg2)
+                  : "memory");
+  return ret;
+}
+
+LIBC_INLINE long syscall_impl(long num, long arg1, long arg2, long arg3) {
+  long ret;
+  LIBC_INLINE_ASM("int $128"
+                  : "=a"(ret)
+                  : "a"(num), "b"(arg1), "c"(arg2), "d"(arg3)
+                  : "memory");
+  return ret;
+}
+
+LIBC_INLINE long syscall_impl(long num, long arg1, long arg2, long arg3,
+                              long arg4) {
+  long ret;
+  LIBC_INLINE_ASM("int $128"
+                  : "=a"(ret)
+                  : "a"(num), "b"(arg1), "c"(arg2), "d"(arg3), "S"(arg4)
+                  : "memory");
+  return ret;
+}
+
+LIBC_INLINE long syscall_impl(long num, long arg1, long arg2, long arg3,
+                              long arg4, long arg5) {
+  long ret;
+  LIBC_INLINE_ASM("int $128"
+                  : "=a"(ret)
+                  : "a"(num), "b"(arg1), "c"(arg2), "d"(arg3), "S"(arg4),
+                    "D"(arg5)
+                  : "memory");
+  return ret;
+}
+
+LIBC_INLINE long syscall_impl(long num, long arg1, long arg2, long arg3,
+                              long arg4, long arg5, long arg6) {
+  long ret;
+  LIBC_INLINE_ASM(R"(
+    push %[arg6]
+    push %%ebp
+    mov 4(%%esp), %%ebp
+    int $128
+    pop %%ebp
+    add $4, %%esp
+  )"
+                  : "=a"(ret)
+                  : "a"(num), "b"(arg1), "c"(arg2), "d"(arg3), "S"(arg4),
+                    "D"(arg5), [arg6] "m"(arg6)
+                  : "memory");
+  return ret;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_I386_SYSCALL_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/linux/i386/vdso.h b/contrib/llvm-project/libc/src/__support/OSUtil/linux/i386/vdso.h
new file mode 100644
index 000000000000..e69de29bb2d1
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/linux/i386/vdso.h
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/linux/io.h b/contrib/llvm-project/libc/src/__support/OSUtil/linux/io.h
new file mode 100644
index 000000000000..63e5b120d5c6
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/linux/io.h
@@ -0,0 +1,27 @@
+//===-------------- Linux implementation of IO utils ------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_IO_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_IO_H
+
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/macros/config.h"
+#include "syscall.h" // For internal syscall function.
+
+#include <sys/syscall.h> // For syscall numbers.
+
+namespace LIBC_NAMESPACE_DECL {
+
+LIBC_INLINE void write_to_stderr(cpp::string_view msg) {
+  LIBC_NAMESPACE::syscall_impl<long>(SYS_write, 2 /* stderr */, msg.data(),
+                                     msg.size());
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_IO_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/linux/riscv/syscall.h b/contrib/llvm-project/libc/src/__support/OSUtil/linux/riscv/syscall.h
new file mode 100644
index 000000000000..e460e9bb56e6
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/linux/riscv/syscall.h
@@ -0,0 +1,111 @@
+//===--------- inline implementation of riscv syscalls ------------* C++ *-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_RISCV_SYSCALL_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_RISCV_SYSCALL_H
+
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+#define REGISTER_DECL_0                                                        \
+  register long a7 __asm__("a7") = number;                                     \
+  register long a0 __asm__("a0");
+#define REGISTER_DECL_1                                                        \
+  register long a7 __asm__("a7") = number;                                     \
+  register long a0 __asm__("a0") = arg1;
+#define REGISTER_DECL_2 REGISTER_DECL_1 register long a1 __asm__("a1") = arg2;
+#define REGISTER_DECL_3                                                        \
+  REGISTER_DECL_2                                                              \
+  register long a2 __asm__("a2") = arg3;
+#define REGISTER_DECL_4                                                        \
+  REGISTER_DECL_3                                                              \
+  register long a3 __asm__("a3") = arg4;
+#define REGISTER_DECL_5                                                        \
+  REGISTER_DECL_4                                                              \
+  register long a4 __asm__("a4") = arg5;
+#define REGISTER_DECL_6                                                        \
+  REGISTER_DECL_5                                                              \
+  register long a5 __asm__("a5") = arg6;
+
+#define REGISTER_CONSTRAINT_0 "r"(a7)
+#define REGISTER_CONSTRAINT_1 REGISTER_CONSTRAINT_0, "r"(a0)
+#define REGISTER_CONSTRAINT_2 REGISTER_CONSTRAINT_1, "r"(a1)
+#define REGISTER_CONSTRAINT_3 REGISTER_CONSTRAINT_2, "r"(a2)
+#define REGISTER_CONSTRAINT_4 REGISTER_CONSTRAINT_3, "r"(a3)
+#define REGISTER_CONSTRAINT_5 REGISTER_CONSTRAINT_4, "r"(a4)
+#define REGISTER_CONSTRAINT_6 REGISTER_CONSTRAINT_5, "r"(a5)
+
+#define SYSCALL_INSTR(input_constraint)                                        \
+  LIBC_INLINE_ASM("ecall\n\t" : "=r"(a0) : input_constraint : "memory")
+
+namespace LIBC_NAMESPACE_DECL {
+
+LIBC_INLINE long syscall_impl(long number) {
+  REGISTER_DECL_0;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_0);
+  return a0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1) {
+  REGISTER_DECL_1;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_1);
+  return a0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2) {
+  REGISTER_DECL_2;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_2);
+  return a0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3) {
+  REGISTER_DECL_3;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_3);
+  return a0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3,
+                              long arg4) {
+  REGISTER_DECL_4;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_4);
+  return a0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3,
+                              long arg4, long arg5) {
+  REGISTER_DECL_5;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_5);
+  return a0;
+}
+
+LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3,
+                              long arg4, long arg5, long arg6) {
+  REGISTER_DECL_6;
+  SYSCALL_INSTR(REGISTER_CONSTRAINT_6);
+  return a0;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#undef REGISTER_DECL_0
+#undef REGISTER_DECL_1
+#undef REGISTER_DECL_2
+#undef REGISTER_DECL_3
+#undef REGISTER_DECL_4
+#undef REGISTER_DECL_5
+#undef REGISTER_DECL_6
+
+#undef REGISTER_CONSTRAINT_0
+#undef REGISTER_CONSTRAINT_1
+#undef REGISTER_CONSTRAINT_2
+#undef REGISTER_CONSTRAINT_3
+#undef REGISTER_CONSTRAINT_4
+#undef REGISTER_CONSTRAINT_5
+#undef REGISTER_CONSTRAINT_6
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_RISCV_SYSCALL_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/linux/riscv/vdso.h b/contrib/llvm-project/libc/src/__support/OSUtil/linux/riscv/vdso.h
new file mode 100644
index 000000000000..24ddb25ea980
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/linux/riscv/vdso.h
@@ -0,0 +1,43 @@
+//===---------- RISC-V vdso configuration -------------------------* C++ *-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_RISCV_VDSO_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_RISCV_VDSO_H
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/OSUtil/linux/vdso_sym.h"
+namespace LIBC_NAMESPACE_DECL {
+namespace vdso {
+// translate VDSOSym to symbol names
+// https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/riscv/kernel/vdso/vdso.lds.S
+LIBC_INLINE constexpr cpp::string_view symbol_name(VDSOSym sym) {
+  switch (sym) {
+  case VDSOSym::RTSigReturn:
+    return "__vdso_rt_sigreturn";
+  case VDSOSym::GetTimeOfDay:
+    return "__vdso_gettimeofday";
+  case VDSOSym::ClockGetTime:
+    return "__vdso_clock_gettime";
+  case VDSOSym::ClockGetRes:
+    return "__vdso_clock_getres";
+  case VDSOSym::GetCpu:
+    return "__vdso_getcpu";
+  case VDSOSym::FlushICache:
+    return "__vdso_flush_icache";
+  case VDSOSym::RiscvHwProbe:
+    return "__vdso_riscv_hwprobe";
+  default:
+    return "";
+  }
+}
+
+// symbol versions
+LIBC_INLINE constexpr cpp::string_view symbol_version(VDSOSym) {
+  return "LINUX_4.15";
+}
+} // namespace vdso
+} // namespace LIBC_NAMESPACE_DECL
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_RISCV_VDSO_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/linux/syscall.h b/contrib/llvm-project/libc/src/__support/OSUtil/linux/syscall.h
new file mode 100644
index 000000000000..24e0fca73c16
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/linux/syscall.h
@@ -0,0 +1,39 @@
+//===----------------------- Linux syscalls ---------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_SYSCALL_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_SYSCALL_H
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+
+#ifdef LIBC_TARGET_ARCH_IS_X86_32
+#include "i386/syscall.h"
+#elif defined(LIBC_TARGET_ARCH_IS_X86_64)
+#include "x86_64/syscall.h"
+#elif defined(LIBC_TARGET_ARCH_IS_AARCH64)
+#include "aarch64/syscall.h"
+#elif defined(LIBC_TARGET_ARCH_IS_ARM)
+#include "arm/syscall.h"
+#elif defined(LIBC_TARGET_ARCH_IS_ANY_RISCV)
+#include "riscv/syscall.h"
+#endif
+
+namespace LIBC_NAMESPACE_DECL {
+
+template <typename R, typename... Ts>
+LIBC_INLINE R syscall_impl(long __number, Ts... ts) {
+  static_assert(sizeof...(Ts) <= 6, "Too many arguments for syscall");
+  return cpp::bit_or_static_cast<R>(syscall_impl(__number, (long)ts...));
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_SYSCALL_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/linux/vdso.cpp b/contrib/llvm-project/libc/src/__support/OSUtil/linux/vdso.cpp
new file mode 100644
index 000000000000..e4e53c3c2a0f
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/linux/vdso.cpp
@@ -0,0 +1,239 @@
+//===------------- Linux VDSO Implementation --------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#include "src/__support/OSUtil/linux/vdso.h"
+#include "hdr/link_macros.h"
+#include "hdr/sys_auxv_macros.h"
+#include "src/__support/CPP/array.h"
+#include "src/__support/CPP/optional.h"
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/libc_errno.h"
+#include "src/__support/threads/callonce.h"
+#include "src/__support/threads/linux/futex_word.h"
+#include "src/sys/auxv/getauxval.h"
+#include <linux/auxvec.h>
+
+// TODO: This is a temporary workaround to avoid including elf.h
+// Include our own headers for ElfW and friends once we have them.
+namespace LIBC_NAMESPACE_DECL {
+
+namespace vdso {
+
+Symbol::VDSOArray Symbol::global_cache{};
+CallOnceFlag Symbol::once_flag = callonce_impl::NOT_CALLED;
+
+namespace {
+// See https://refspecs.linuxfoundation.org/LSB_1.3.0/gLSB/gLSB/symverdefs.html
+struct Verdaux {
+  ElfW(Word) vda_name; /* Version or dependency names */
+  ElfW(Word) vda_next; /* Offset in bytes to next verdaux
+                          entry */
+};
+struct Verdef {
+  ElfW(Half) vd_version; /* Version revision */
+  ElfW(Half) vd_flags;   /* Version information */
+  ElfW(Half) vd_ndx;     /* Version Index */
+  ElfW(Half) vd_cnt;     /* Number of associated aux entries */
+  ElfW(Word) vd_hash;    /* Version name hash value */
+  ElfW(Word) vd_aux;     /* Offset in bytes to verdaux array */
+  ElfW(Word) vd_next;    /* Offset in bytes to next verdef entry */
+  Verdef *next() const {
+    if (vd_next == 0)
+      return nullptr;
+    return reinterpret_cast<Verdef *>(reinterpret_cast<uintptr_t>(this) +
+                                      vd_next);
+  }
+  Verdaux *aux() const {
+    return reinterpret_cast<Verdaux *>(reinterpret_cast<uintptr_t>(this) +
+                                       vd_aux);
+  }
+};
+
+// version search procedure specified by
+// https://refspecs.linuxfoundation.org/LSB_1.3.0/gLSB/gLSB/symversion.html#SYMVERTBL
+cpp::string_view find_version(Verdef *verdef, ElfW(Half) * versym,
+                              const char *strtab, size_t idx) {
+#ifndef VER_FLG_BASE
+  constexpr ElfW(Half) VER_FLG_BASE = 0x1;
+#endif
+  if (!versym)
+    return "";
+  ElfW(Half) identifier = versym[idx] & 0x7FFF;
+  // iterate through all version definitions
+  for (Verdef *def = verdef; def != nullptr; def = def->next()) {
+    // skip if this is a file-level version
+    if (def->vd_flags & VER_FLG_BASE)
+      continue;
+    // check if the version identifier matches. Highest bit is used to determine
+    // whether the symbol is local. Only lower 15 bits are used for version
+    // identifier.
+    if ((def->vd_ndx & 0x7FFF) == identifier) {
+      Verdaux *aux = def->aux();
+      return strtab + aux->vda_name;
+    }
+  }
+  return "";
+}
+
+size_t shdr_get_symbol_count(ElfW(Shdr) * vdso_shdr, size_t e_shnum) {
+  if (!vdso_shdr)
+    return 0;
+  // iterate all sections until we locate the dynamic symbol section
+  for (size_t i = 0; i < e_shnum; ++i) {
+    // dynamic symbol section is a table section
+    // therefore, the number of entries can be computed as the ratio
+    // of the section size to the size of a single entry
+    if (vdso_shdr[i].sh_type == SHT_DYNSYM)
+      return vdso_shdr[i].sh_size / vdso_shdr[i].sh_entsize;
+  }
+  return 0;
+}
+
+struct VDSOSymbolTable {
+  const char *strtab;
+  ElfW(Sym) * symtab;
+  // The following can be nullptr if the vDSO does not have versioning
+  ElfW(Half) * versym;
+  Verdef *verdef;
+
+  void populate_symbol_cache(Symbol::VDSOArray &symbol_table,
+                             size_t symbol_count, ElfW(Addr) vdso_addr) {
+    for (size_t i = 0, e = symbol_table.size(); i < e; ++i) {
+      Symbol sym = i;
+      cpp::string_view name = sym.name();
+      cpp::string_view version = sym.version();
+      if (name.empty())
+        continue;
+
+      for (size_t j = 0; j < symbol_count; ++j) {
+        if (name == strtab + symtab[j].st_name) {
+          // we find a symbol with desired name
+          // now we need to check if it has the right version
+          if (versym && verdef &&
+              version != find_version(verdef, versym, strtab, j))
+            continue;
+
+          // put the symbol address into the symbol table
+          symbol_table[i] =
+              reinterpret_cast<void *>(vdso_addr + symtab[j].st_value);
+        }
+      }
+    }
+  }
+};
+
+struct PhdrInfo {
+  ElfW(Addr) vdso_addr;
+  ElfW(Dyn) * vdso_dyn;
+  static cpp::optional<PhdrInfo> from(ElfW(Phdr) * vdso_phdr, size_t e_phnum,
+                                      uintptr_t vdso_ehdr_addr) {
+    constexpr ElfW(Addr) INVALID_ADDR = static_cast<ElfW(Addr)>(-1);
+    ElfW(Addr) vdso_addr = INVALID_ADDR;
+    ElfW(Dyn) *vdso_dyn = nullptr;
+    if (!vdso_phdr)
+      return cpp::nullopt;
+    // iterate through all the program headers until we get the desired pieces
+    for (size_t i = 0; i < e_phnum; ++i) {
+      if (vdso_phdr[i].p_type == PT_DYNAMIC)
+        vdso_dyn = reinterpret_cast<ElfW(Dyn) *>(vdso_ehdr_addr +
+                                                 vdso_phdr[i].p_offset);
+
+      if (vdso_phdr[i].p_type == PT_LOAD)
+        vdso_addr =
+            vdso_ehdr_addr + vdso_phdr[i].p_offset - vdso_phdr[i].p_vaddr;
+
+      if (vdso_addr && vdso_dyn)
+        return PhdrInfo{vdso_addr, vdso_dyn};
+    }
+
+    return cpp::nullopt;
+  }
+
+  cpp::optional<VDSOSymbolTable> populate_symbol_table() {
+    const char *strtab = nullptr;
+    ElfW(Sym) *symtab = nullptr;
+    ElfW(Half) *versym = nullptr;
+    Verdef *verdef = nullptr;
+    for (ElfW(Dyn) *d = vdso_dyn; d->d_tag != DT_NULL; ++d) {
+      switch (d->d_tag) {
+      case DT_STRTAB:
+        strtab = reinterpret_cast<const char *>(vdso_addr + d->d_un.d_ptr);
+        break;
+      case DT_SYMTAB:
+        symtab = reinterpret_cast<ElfW(Sym) *>(vdso_addr + d->d_un.d_ptr);
+        break;
+      case DT_VERSYM:
+        versym = reinterpret_cast<uint16_t *>(vdso_addr + d->d_un.d_ptr);
+        break;
+      case DT_VERDEF:
+        verdef = reinterpret_cast<Verdef *>(vdso_addr + d->d_un.d_ptr);
+        break;
+      }
+      if (strtab && symtab && versym && verdef)
+        break;
+    }
+    if (strtab == nullptr || symtab == nullptr)
+      return cpp::nullopt;
+
+    return VDSOSymbolTable{strtab, symtab, versym, verdef};
+  }
+};
+} // namespace
+
+void Symbol::initialize_vdso_global_cache() {
+  // first clear the symbol table
+  for (auto &i : global_cache)
+    i = nullptr;
+
+  // get the address of the VDSO, protect errno since getauxval may change
+  // it
+  int errno_backup = libc_errno;
+  uintptr_t vdso_ehdr_addr = getauxval(AT_SYSINFO_EHDR);
+  // Get the memory address of the vDSO ELF header.
+  auto vdso_ehdr = reinterpret_cast<ElfW(Ehdr) *>(vdso_ehdr_addr);
+  // leave the table unpopulated if we don't have vDSO
+  if (vdso_ehdr == nullptr) {
+    libc_errno = errno_backup;
+    return;
+  }
+
+  // locate the section header inside the elf using the section header
+  // offset
+  auto vdso_shdr =
+      reinterpret_cast<ElfW(Shdr) *>(vdso_ehdr_addr + vdso_ehdr->e_shoff);
+  size_t symbol_count = shdr_get_symbol_count(vdso_shdr, vdso_ehdr->e_shnum);
+
+  // early return if no symbol is found
+  if (symbol_count == 0)
+    return;
+
+  // We need to find both the loadable segment and the dynamic linking of
+  // the vDSO. compute vdso_phdr as the program header using the program
+  // header offset
+  ElfW(Phdr) *vdso_phdr =
+      reinterpret_cast<ElfW(Phdr) *>(vdso_ehdr_addr + vdso_ehdr->e_phoff);
+  cpp::optional<PhdrInfo> phdr_info =
+      PhdrInfo::from(vdso_phdr, vdso_ehdr->e_phnum, vdso_ehdr_addr);
+  // early return if either the dynamic linking or the loadable segment is
+  // not found
+  if (!phdr_info.has_value())
+    return;
+
+  // now, locate several more tables inside the dynmaic linking section
+  cpp::optional<VDSOSymbolTable> vdso_symbol_table =
+      phdr_info->populate_symbol_table();
+
+  // early return if we can't find any required fields of the symbol table
+  if (!vdso_symbol_table.has_value())
+    return;
+
+  // finally, populate the global symbol table cache
+  vdso_symbol_table->populate_symbol_cache(global_cache, symbol_count,
+                                           phdr_info->vdso_addr);
+}
+} // namespace vdso
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/linux/vdso.h b/contrib/llvm-project/libc/src/__support/OSUtil/linux/vdso.h
new file mode 100644
index 000000000000..a5108b3a1fb5
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/linux/vdso.h
@@ -0,0 +1,81 @@
+//===------------- Linux VDSO Header ----------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_VDSO_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_VDSO_H
+#include "src/__support/CPP/array.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/properties/architectures.h"
+#include "src/__support/threads/callonce.h"
+
+#if defined(LIBC_TARGET_ARCH_IS_X86)
+#include "x86_64/vdso.h"
+#elif defined(LIBC_TARGET_ARCH_IS_AARCH64)
+#include "aarch64/vdso.h"
+#elif defined(LIBC_TARGET_ARCH_IS_ARM)
+#include "arm/vdso.h"
+#elif defined(LIBC_TARGET_ARCH_IS_ANY_RISCV)
+#include "riscv/vdso.h"
+#else
+#error "unknown arch"
+#endif
+
+namespace LIBC_NAMESPACE_DECL {
+namespace vdso {
+
+class Symbol {
+  VDSOSym sym;
+
+public:
+  LIBC_INLINE_VAR static constexpr size_t COUNT =
+      static_cast<size_t>(VDSOSym::VDSOSymCount);
+  LIBC_INLINE constexpr explicit Symbol(VDSOSym sym) : sym(sym) {}
+  LIBC_INLINE constexpr Symbol(size_t idx) : sym(static_cast<VDSOSym>(idx)) {}
+  LIBC_INLINE constexpr cpp::string_view name() const {
+    return symbol_name(sym);
+  }
+  LIBC_INLINE constexpr cpp::string_view version() const {
+    return symbol_version(sym);
+  }
+  LIBC_INLINE constexpr operator size_t() const {
+    return static_cast<size_t>(sym);
+  }
+  LIBC_INLINE constexpr bool is_valid() const {
+    return *this < Symbol::global_cache.size();
+  }
+  using VDSOArray = cpp::array<void *, Symbol::COUNT>;
+
+private:
+  static CallOnceFlag once_flag;
+  static VDSOArray global_cache;
+  static void initialize_vdso_global_cache();
+
+  LIBC_INLINE void *get() const {
+    if (name().empty() || !is_valid())
+      return nullptr;
+
+    callonce(&once_flag, Symbol::initialize_vdso_global_cache);
+    return (global_cache[*this]);
+  }
+  template <VDSOSym sym> friend struct TypedSymbol;
+};
+
+template <VDSOSym sym> struct TypedSymbol {
+  LIBC_INLINE constexpr operator VDSOSymType<sym>() const {
+    return cpp::bit_cast<VDSOSymType<sym>>(Symbol{sym}.get());
+  }
+  template <typename... Args>
+  LIBC_INLINE auto operator()(Args &&...args) const {
+    return this->operator VDSOSymType<sym>()(cpp::forward<Args>(args)...);
+  }
+};
+
+} // namespace vdso
+
+} // namespace LIBC_NAMESPACE_DECL
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_VDSO_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/linux/vdso_sym.h b/contrib/llvm-project/libc/src/__support/OSUtil/linux/vdso_sym.h
new file mode 100644
index 000000000000..968e1536c4d2
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/linux/vdso_sym.h
@@ -0,0 +1,70 @@
+//===------------- Linux VDSO Symbols ---------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#include "hdr/types/clock_t.h"
+#include "hdr/types/clockid_t.h"
+#include "hdr/types/struct_timespec.h"
+#include "hdr/types/struct_timeval.h"
+#include "hdr/types/time_t.h"
+#include "src/__support/common.h"
+#include <stddef.h> // For size_t.
+
+// NOLINTBEGIN(llvmlibc-implementation-in-namespace)
+// TODO: some of the following can be defined via proxy headers.
+struct __kernel_timespec;
+struct timezone;
+struct riscv_hwprobe;
+struct getcpu_cache;
+struct cpu_set_t;
+// NOLINTEND(llvmlibc-implementation-in-namespace)
+
+namespace LIBC_NAMESPACE_DECL {
+namespace vdso {
+
+enum class VDSOSym {
+  ClockGetTime,
+  ClockGetTime64,
+  GetTimeOfDay,
+  GetCpu,
+  Time,
+  ClockGetRes,
+  RTSigReturn,
+  FlushICache,
+  RiscvHwProbe,
+  VDSOSymCount
+};
+
+template <VDSOSym sym> LIBC_INLINE constexpr auto dispatcher() {
+  if constexpr (sym == VDSOSym::ClockGetTime)
+    return static_cast<int (*)(clockid_t, timespec *)>(nullptr);
+  else if constexpr (sym == VDSOSym::ClockGetTime64)
+    return static_cast<int (*)(clockid_t, __kernel_timespec *)>(nullptr);
+  else if constexpr (sym == VDSOSym::GetTimeOfDay)
+    return static_cast<int (*)(timeval *__restrict,
+                               struct timezone *__restrict)>(nullptr);
+  else if constexpr (sym == VDSOSym::GetCpu)
+    return static_cast<int (*)(unsigned *, unsigned *, getcpu_cache *)>(
+        nullptr);
+  else if constexpr (sym == VDSOSym::Time)
+    return static_cast<time_t (*)(time_t *)>(nullptr);
+  else if constexpr (sym == VDSOSym::ClockGetRes)
+    return static_cast<int (*)(clockid_t, timespec *)>(nullptr);
+  else if constexpr (sym == VDSOSym::RTSigReturn)
+    return static_cast<void (*)(void)>(nullptr);
+  else if constexpr (sym == VDSOSym::FlushICache)
+    return static_cast<void (*)(void *, void *, unsigned int)>(nullptr);
+  else if constexpr (sym == VDSOSym::RiscvHwProbe)
+    return static_cast<int (*)(riscv_hwprobe *, size_t, size_t, cpu_set_t *,
+                               unsigned)>(nullptr);
+  else
+    return static_cast<void *>(nullptr);
+}
+
+template <VDSOSym sym> using VDSOSymType = decltype(dispatcher<sym>());
+
+} // namespace vdso
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/linux/x86_64/syscall.h b/contrib/llvm-project/libc/src/__support/OSUtil/linux/x86_64/syscall.h
new file mode 100644
index 000000000000..ebd77980af6a
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/linux/x86_64/syscall.h
@@ -0,0 +1,99 @@
+//===---------- inline implementation of x86_64 syscalls ----------* C++ *-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_X86_64_SYSCALL_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_X86_64_SYSCALL_H
+
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+#define SYSCALL_CLOBBER_LIST "rcx", "r11", "memory"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LIBC_INLINE long syscall_impl(long __number) {
+  long retcode;
+  LIBC_INLINE_ASM("syscall"
+                  : "=a"(retcode)
+                  : "a"(__number)
+                  : SYSCALL_CLOBBER_LIST);
+  return retcode;
+}
+
+LIBC_INLINE long syscall_impl(long __number, long __arg1) {
+  long retcode;
+  LIBC_INLINE_ASM("syscall"
+                  : "=a"(retcode)
+                  : "a"(__number), "D"(__arg1)
+                  : SYSCALL_CLOBBER_LIST);
+  return retcode;
+}
+
+LIBC_INLINE long syscall_impl(long __number, long __arg1, long __arg2) {
+  long retcode;
+  LIBC_INLINE_ASM("syscall"
+                  : "=a"(retcode)
+                  : "a"(__number), "D"(__arg1), "S"(__arg2)
+                  : SYSCALL_CLOBBER_LIST);
+  return retcode;
+}
+
+LIBC_INLINE long syscall_impl(long __number, long __arg1, long __arg2,
+                              long __arg3) {
+  long retcode;
+  LIBC_INLINE_ASM("syscall"
+                  : "=a"(retcode)
+                  : "a"(__number), "D"(__arg1), "S"(__arg2), "d"(__arg3)
+                  : SYSCALL_CLOBBER_LIST);
+  return retcode;
+}
+
+LIBC_INLINE long syscall_impl(long __number, long __arg1, long __arg2,
+                              long __arg3, long __arg4) {
+  long retcode;
+  register long r10 __asm__("r10") = __arg4;
+  LIBC_INLINE_ASM("syscall"
+                  : "=a"(retcode)
+                  : "a"(__number), "D"(__arg1), "S"(__arg2), "d"(__arg3),
+                    "r"(r10)
+                  : SYSCALL_CLOBBER_LIST);
+  return retcode;
+}
+
+LIBC_INLINE long syscall_impl(long __number, long __arg1, long __arg2,
+                              long __arg3, long __arg4, long __arg5) {
+  long retcode;
+  register long r10 __asm__("r10") = __arg4;
+  register long r8 __asm__("r8") = __arg5;
+  LIBC_INLINE_ASM("syscall"
+                  : "=a"(retcode)
+                  : "a"(__number), "D"(__arg1), "S"(__arg2), "d"(__arg3),
+                    "r"(r10), "r"(r8)
+                  : SYSCALL_CLOBBER_LIST);
+  return retcode;
+}
+
+LIBC_INLINE long syscall_impl(long __number, long __arg1, long __arg2,
+                              long __arg3, long __arg4, long __arg5,
+                              long __arg6) {
+  long retcode;
+  register long r10 __asm__("r10") = __arg4;
+  register long r8 __asm__("r8") = __arg5;
+  register long r9 __asm__("r9") = __arg6;
+  LIBC_INLINE_ASM("syscall"
+                  : "=a"(retcode)
+                  : "a"(__number), "D"(__arg1), "S"(__arg2), "d"(__arg3),
+                    "r"(r10), "r"(r8), "r"(r9)
+                  : SYSCALL_CLOBBER_LIST);
+  return retcode;
+}
+
+#undef SYSCALL_CLOBBER_LIST
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_X86_64_SYSCALL_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/linux/x86_64/vdso.h b/contrib/llvm-project/libc/src/__support/OSUtil/linux/x86_64/vdso.h
new file mode 100644
index 000000000000..abe7c33e07cf
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/linux/x86_64/vdso.h
@@ -0,0 +1,43 @@
+//===---------- x86/x86_64 vdso configuration ---------------------* C++ *-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_X86_64_VDSO_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_X86_64_VDSO_H
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/OSUtil/linux/vdso_sym.h"
+namespace LIBC_NAMESPACE_DECL {
+namespace vdso {
+// translate VDSOSym to symbol names
+// On x86, there are symbols defined without the __vdso_ prefix, however,
+// it is suggested that one should use the __vdso_ prefix.
+// Additionally, there is also an __vdso_sgx_enter_enclave, it is for the SGX
+// support, we do not include it here for now.
+// https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/entry/vdso/vdso.lds.S
+LIBC_INLINE constexpr cpp::string_view symbol_name(VDSOSym sym) {
+  switch (sym) {
+  case VDSOSym::ClockGetTime:
+    return "__vdso_clock_gettime";
+  case VDSOSym::GetTimeOfDay:
+    return "__vdso_gettimeofday";
+  case VDSOSym::GetCpu:
+    return "__vdso_getcpu";
+  case VDSOSym::Time:
+    return "__vdso_time";
+  case VDSOSym::ClockGetRes:
+    return "__vdso_clock_getres";
+  default:
+    return "";
+  }
+}
+
+// symbol versions
+LIBC_INLINE constexpr cpp::string_view symbol_version(VDSOSym) {
+  return "LINUX_2.6";
+}
+} // namespace vdso
+} // namespace LIBC_NAMESPACE_DECL
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_X86_64_VDSO_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/syscall.h b/contrib/llvm-project/libc/src/__support/OSUtil/syscall.h
new file mode 100644
index 000000000000..fc697a7c0982
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/syscall.h
@@ -0,0 +1,18 @@
+//===--------------- Internal syscall declarations --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_SYSCALL_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_SYSCALL_H
+
+#ifdef __APPLE__
+#include "darwin/syscall.h"
+#elif defined(__linux__)
+#include "linux/syscall.h"
+#endif
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_SYSCALL_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/uefi/error.h b/contrib/llvm-project/libc/src/__support/OSUtil/uefi/error.h
new file mode 100644
index 000000000000..9fdc569bab57
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/uefi/error.h
@@ -0,0 +1,104 @@
+//===----------- UEFI implementation of error utils --------------*- C++-*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_UEFI_ERROR_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_UEFI_ERROR_H
+
+#include "hdr/errno_macros.h"
+#include "include/llvm-libc-types/EFI_STATUS.h"
+#include "src/__support/CPP/array.h"
+#include "src/__support/CPP/limits.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+static constexpr int EFI_ERROR_MAX_BIT = cpp::numeric_limits<EFI_STATUS>::max();
+
+static constexpr int EFI_ENCODE_ERROR(int value) {
+  return EFI_ERROR_MAX_BIT | (EFI_ERROR_MAX_BIT >> 2) | (value);
+}
+
+static constexpr int EFI_ENCODE_WARNING(int value) {
+  return (EFI_ERROR_MAX_BIT >> 2) | (value);
+}
+
+struct UefiStatusErrnoEntry {
+  EFI_STATUS status;
+  int errno_value;
+};
+
+static constexpr cpp::array<UefiStatusErrnoEntry, 43> UEFI_STATUS_ERRNO_MAP = {{
+    {EFI_SUCCESS, 0},
+    {EFI_ENCODE_ERROR(EFI_LOAD_ERROR), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_INVALID_PARAMETER), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_BAD_BUFFER_SIZE), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_NOT_READY), EBUSY},
+    {EFI_ENCODE_ERROR(EFI_DEVICE_ERROR), EIO},
+    {EFI_ENCODE_ERROR(EFI_WRITE_PROTECTED), EPERM},
+    {EFI_ENCODE_ERROR(EFI_OUT_OF_RESOURCES), ENOMEM},
+    {EFI_ENCODE_ERROR(EFI_VOLUME_CORRUPTED), EROFS},
+    {EFI_ENCODE_ERROR(EFI_VOLUME_FULL), ENOSPC},
+    {EFI_ENCODE_ERROR(EFI_NO_MEDIA), ENODEV},
+    {EFI_ENCODE_ERROR(EFI_MEDIA_CHANGED), ENXIO},
+    {EFI_ENCODE_ERROR(EFI_NOT_FOUND), ENOENT},
+    {EFI_ENCODE_ERROR(EFI_ACCESS_DENIED), EACCES},
+    {EFI_ENCODE_ERROR(EFI_NO_RESPONSE), EBUSY},
+    {EFI_ENCODE_ERROR(EFI_NO_MAPPING), ENODEV},
+    {EFI_ENCODE_ERROR(EFI_TIMEOUT), EBUSY},
+    {EFI_ENCODE_ERROR(EFI_NOT_STARTED), EAGAIN},
+    {EFI_ENCODE_ERROR(EFI_ALREADY_STARTED), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_ABORTED), EFAULT},
+    {EFI_ENCODE_ERROR(EFI_ICMP_ERROR), EIO},
+    {EFI_ENCODE_ERROR(EFI_TFTP_ERROR), EIO},
+    {EFI_ENCODE_ERROR(EFI_PROTOCOL_ERROR), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_INCOMPATIBLE_VERSION), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_SECURITY_VIOLATION), EPERM},
+    {EFI_ENCODE_ERROR(EFI_CRC_ERROR), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_END_OF_MEDIA), EPIPE},
+    {EFI_ENCODE_ERROR(EFI_END_OF_FILE), EPIPE},
+    {EFI_ENCODE_ERROR(EFI_INVALID_LANGUAGE), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_COMPROMISED_DATA), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_IP_ADDRESS_CONFLICT), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_HTTP_ERROR), EIO},
+    {EFI_ENCODE_WARNING(EFI_WARN_UNKNOWN_GLYPH), EINVAL},
+    {EFI_ENCODE_WARNING(EFI_WARN_DELETE_FAILURE), EROFS},
+    {EFI_ENCODE_WARNING(EFI_WARN_WRITE_FAILURE), EROFS},
+    {EFI_ENCODE_WARNING(EFI_WARN_BUFFER_TOO_SMALL), E2BIG},
+    {EFI_ENCODE_WARNING(EFI_WARN_STALE_DATA), EINVAL},
+    {EFI_ENCODE_WARNING(EFI_WARN_FILE_SYSTEM), EROFS},
+    {EFI_ENCODE_WARNING(EFI_WARN_RESET_REQUIRED), EINTR},
+}};
+
+LIBC_INLINE int uefi_status_to_errno(EFI_STATUS status) {
+  for (auto it = UEFI_STATUS_ERRNO_MAP.begin();
+       it != UEFI_STATUS_ERRNO_MAP.end(); it++) {
+    const struct UefiStatusErrnoEntry entry = *it;
+    if (entry.status == status)
+      return entry.errno_value;
+  }
+
+  // Unknown type
+  return EINVAL;
+}
+
+LIBC_INLINE EFI_STATUS errno_to_uefi_status(int errno_value) {
+  for (auto it = UEFI_STATUS_ERRNO_MAP.begin();
+       it != UEFI_STATUS_ERRNO_MAP.end(); it++) {
+    const struct UefiStatusErrnoEntry entry = *it;
+    if (entry.errno_value == errno_value)
+      return entry.status;
+  }
+
+  // Unknown type
+  return EFI_INVALID_PARAMETER;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_UEFI_ERROR_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/uefi/exit.cpp b/contrib/llvm-project/libc/src/__support/OSUtil/uefi/exit.cpp
new file mode 100644
index 000000000000..e734983cd125
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/uefi/exit.cpp
@@ -0,0 +1,24 @@
+//===-------- UEFI implementation of an exit function ------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===-----------------------------------------------------------------===//
+
+#include "src/__support/OSUtil/exit.h"
+#include "config/uefi.h"
+#include "include/llvm-libc-types/EFI_SYSTEM_TABLE.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+[[noreturn]] void exit(int status) {
+  app.system_table->BootServices->Exit(__llvm_libc_efi_image_handle, status, 0,
+                                       nullptr);
+  __builtin_unreachable();
+}
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/uefi/io.cpp b/contrib/llvm-project/libc/src/__support/OSUtil/uefi/io.cpp
new file mode 100644
index 000000000000..e1e50fbad393
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/uefi/io.cpp
@@ -0,0 +1,41 @@
+//===---------- UEFI implementation of IO utils ------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===-----------------------------------------------------------------===//
+
+#include "io.h"
+
+#include "Uefi.h"
+#include "config/app.h"
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+ssize_t read_from_stdin([[gnu::unused]] char *buf,
+                        [[gnu::unused]] size_t size) {
+  return 0;
+}
+
+void write_to_stdout(cpp::string_view msg) {
+  // TODO: use mbstowcs once implemented
+  for (size_t i = 0; i < msg.size(); i++) {
+    char16_t e[2] = {msg[i], 0};
+    app.system_table->ConOut->OutputString(
+        app.system_table->ConOut, reinterpret_cast<const char16_t *>(&e));
+  }
+}
+
+void write_to_stderr(cpp::string_view msg) {
+  // TODO: use mbstowcs once implemented
+  for (size_t i = 0; i < msg.size(); i++) {
+    char16_t e[2] = {msg[i], 0};
+    app.system_table->StdErr->OutputString(
+        app.system_table->StdErr, reinterpret_cast<const char16_t *>(&e));
+  }
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/uefi/io.h b/contrib/llvm-project/libc/src/__support/OSUtil/uefi/io.h
new file mode 100644
index 000000000000..088ae09b8c60
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/uefi/io.h
@@ -0,0 +1,25 @@
+//===---------- UEFI implementation of IO utils ------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===-----------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_UEFI_IO_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_UEFI_IO_H
+
+#include "include/llvm-libc-types/size_t.h"
+#include "include/llvm-libc-types/ssize_t.h"
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+ssize_t read_from_stdin(char *buf, size_t size);
+void write_to_stderr(cpp::string_view msg);
+void write_to_stdout(cpp::string_view msg);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_UEFI_IO_H
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/windows/exit.cpp b/contrib/llvm-project/libc/src/__support/OSUtil/windows/exit.cpp
new file mode 100644
index 000000000000..369b07b84887
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/windows/exit.cpp
@@ -0,0 +1,23 @@
+//===-- Windows implementation of an exit function ------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/__support/macros/config.h"
+
+// On Windows we cannot make direct syscalls since Microsoft changes system call
+// IDs periodically. We must rely on functions exported from ntdll.dll or
+// kernel32.dll to invoke system service procedures.
+#define WIN32_LEAN_AND_MEAN
+#include <Windows.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+[[noreturn]] void exit(int status) { ::ExitProcess(status); }
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/windows/io.cpp b/contrib/llvm-project/libc/src/__support/OSUtil/windows/io.cpp
new file mode 100644
index 000000000000..af3d1b9e4397
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/windows/io.cpp
@@ -0,0 +1,25 @@
+//===------------- Windows implementation of IO utils -----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "io.h"
+#include "src/__support/macros/config.h"
+
+// On Windows we cannot make direct syscalls since Microsoft changes system call
+// IDs periodically. We must rely on functions exported from ntdll.dll or
+// kernel32.dll to invoke system service procedures.
+#define WIN32_LEAN_AND_MEAN
+#include <Windows.h>
+
+namespace LIBC_NAMESPACE_DECL {
+
+void write_to_stderr(cpp::string_view msg) {
+  ::HANDLE stream = ::GetStdHandle(STD_ERROR_HANDLE);
+  ::WriteFile(stream, msg.data(), msg.size(), nullptr, nullptr);
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/OSUtil/windows/io.h b/contrib/llvm-project/libc/src/__support/OSUtil/windows/io.h
new file mode 100644
index 000000000000..bafc00254a7c
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/OSUtil/windows/io.h
@@ -0,0 +1,21 @@
+//===------------- Windows implementation of IO utils -----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_WINDOWS_IO_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_WINDOWS_IO_H
+
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+void write_to_stderr(cpp::string_view msg);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_WINDOWS_IO_H
diff --git a/contrib/llvm-project/libc/src/__support/RPC/rpc_client.cpp b/contrib/llvm-project/libc/src/__support/RPC/rpc_client.cpp
new file mode 100644
index 000000000000..625e474a4678
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/RPC/rpc_client.cpp
@@ -0,0 +1,22 @@
+//===-- Shared memory RPC client instantiation ------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "rpc_client.h"
+
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace rpc {
+
+/// The libc client instance used to communicate with the server. Externally
+/// visible symbol to signify the usage of an RPC client to whomever needs to
+/// run the server as well as provide a way to initialize the client.
+[[gnu::visibility("protected")]] Client client;
+
+} // namespace rpc
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/RPC/rpc_client.h b/contrib/llvm-project/libc/src/__support/RPC/rpc_client.h
new file mode 100644
index 000000000000..199803badf1a
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/RPC/rpc_client.h
@@ -0,0 +1,37 @@
+//===-- Shared memory RPC client instantiation ------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_RPC_RPC_CLIENT_H
+#define LLVM_LIBC_SRC___SUPPORT_RPC_RPC_CLIENT_H
+
+#include "shared/rpc.h"
+#include "shared/rpc_opcodes.h"
+
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace rpc {
+
+using ::rpc::Buffer;
+using ::rpc::Client;
+using ::rpc::Port;
+using ::rpc::Process;
+using ::rpc::Server;
+
+static_assert(cpp::is_trivially_copyable<Client>::value &&
+                  sizeof(Process<true>) == sizeof(Process<false>),
+              "The client is not trivially copyable from the server");
+
+/// The libc client instance used to communicate with the server.
+[[gnu::visibility("protected")]] extern Client client asm("__llvm_rpc_client");
+
+} // namespace rpc
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif
diff --git a/contrib/llvm-project/libc/src/__support/RPC/rpc_server.h b/contrib/llvm-project/libc/src/__support/RPC/rpc_server.h
new file mode 100644
index 000000000000..dc3d8030caa4
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/RPC/rpc_server.h
@@ -0,0 +1,551 @@
+//===-- Shared memory RPC server instantiation ------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is intended to be used externally as part of the `shared/`
+// interface. For that purpose, we manually define a few options normally
+// handled by the libc build system.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_RPC_RPC_SERVER_H
+#define LLVM_LIBC_SRC___SUPPORT_RPC_RPC_SERVER_H
+
+// Workaround for missing __has_builtin in < GCC 10.
+#ifndef __has_builtin
+#define __has_builtin(x) 0
+#endif
+
+// Workaround for missing __builtin_is_constant_evaluated in < GCC 10.
+#ifndef __builtin_is_constant_evaluated
+#define __builtin_is_constant_evaluated(x) 0
+#endif
+
+// Configs for using the LLVM libc writer interface.
+#define LIBC_COPT_USE_C_ASSERT
+#define LIBC_COPT_MEMCPY_USE_EMBEDDED_TINY
+#define LIBC_COPT_ARRAY_ARG_LIST
+#define LIBC_COPT_PRINTF_DISABLE_WRITE_INT
+#define LIBC_COPT_PRINTF_DISABLE_INDEX_MODE
+#define LIBC_COPT_PRINTF_DISABLE_STRERROR
+
+// The 'long double' type is 8 bytes.
+#define LIBC_TYPES_LONG_DOUBLE_IS_FLOAT64
+
+#include "shared/rpc.h"
+#include "shared/rpc_opcodes.h"
+
+#include "src/__support/arg_list.h"
+#include "src/stdio/printf_core/converter.h"
+#include "src/stdio/printf_core/parser.h"
+#include "src/stdio/printf_core/writer.h"
+
+#include "hdr/stdio_overlay.h"
+#include "hdr/stdlib_overlay.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+// Minimal replacement for 'std::vector' that works for trivial types.
+template <typename T> class TempVector {
+  static_assert(cpp::is_trivially_constructible<T>::value &&
+                    cpp::is_trivially_destructible<T>::value,
+                "Not a trivial type.");
+  T *data;
+  size_t current;
+  size_t capacity;
+
+public:
+  LIBC_INLINE TempVector() : data(nullptr), current(0), capacity(0) {}
+
+  LIBC_INLINE ~TempVector() { free(data); }
+
+  LIBC_INLINE void push_back(const T &value) {
+    if (current == capacity)
+      grow();
+    data[current] = T(value);
+    ++current;
+  }
+
+  LIBC_INLINE void push_back(T &&value) {
+    if (current == capacity)
+      grow();
+    data[current] = T(static_cast<T &&>(value));
+    ++current;
+  }
+
+  LIBC_INLINE void pop_back() { --current; }
+
+  LIBC_INLINE bool empty() { return current == 0; }
+
+  LIBC_INLINE size_t size() { return current; }
+
+  LIBC_INLINE T &operator[](size_t index) { return data[index]; }
+
+  LIBC_INLINE T &back() { return data[current - 1]; }
+
+private:
+  LIBC_INLINE void grow() {
+    size_t new_capacity = capacity ? capacity * 2 : 1;
+    void *new_data = realloc(data, new_capacity * sizeof(T));
+    data = static_cast<T *>(new_data);
+    capacity = new_capacity;
+  }
+};
+
+struct TempStorage {
+  LIBC_INLINE char *alloc(size_t size) {
+    storage.push_back(reinterpret_cast<char *>(malloc(size)));
+    return storage.back();
+  }
+
+  LIBC_INLINE ~TempStorage() {
+    for (size_t i = 0; i < storage.size(); ++i)
+      free(storage[i]);
+  }
+
+  TempVector<char *> storage;
+};
+
+// Get the associated stream out of an encoded number.
+LIBC_INLINE static ::FILE *to_stream(uintptr_t f) {
+  enum Stream {
+    File = 0,
+    Stdin = 1,
+    Stdout = 2,
+    Stderr = 3,
+  };
+
+  ::FILE *stream = reinterpret_cast<FILE *>(f & ~0x3ull);
+  Stream type = static_cast<Stream>(f & 0x3ull);
+  if (type == Stdin)
+    return stdin;
+  if (type == Stdout)
+    return stdout;
+  if (type == Stderr)
+    return stderr;
+  return stream;
+}
+
+template <bool packed, uint32_t num_lanes>
+LIBC_INLINE static void handle_printf(rpc::Server::Port &port,
+                                      TempStorage &temp_storage) {
+  FILE *files[num_lanes] = {nullptr};
+  // Get the appropriate output stream to use.
+  if (port.get_opcode() == LIBC_PRINTF_TO_STREAM ||
+      port.get_opcode() == LIBC_PRINTF_TO_STREAM_PACKED) {
+    port.recv([&](rpc::Buffer *buffer, uint32_t id) {
+      files[id] = reinterpret_cast<FILE *>(buffer->data[0]);
+    });
+  } else if (port.get_opcode() == LIBC_PRINTF_TO_STDOUT ||
+             port.get_opcode() == LIBC_PRINTF_TO_STDOUT_PACKED) {
+    for (uint32_t i = 0; i < num_lanes; ++i)
+      files[i] = stdout;
+  } else {
+    for (uint32_t i = 0; i < num_lanes; ++i)
+      files[i] = stderr;
+  }
+
+  uint64_t format_sizes[num_lanes] = {0};
+  void *format[num_lanes] = {nullptr};
+
+  uint64_t args_sizes[num_lanes] = {0};
+  void *args[num_lanes] = {nullptr};
+
+  // Recieve the format string and arguments from the client.
+  port.recv_n(format, format_sizes,
+              [&](uint64_t size) { return temp_storage.alloc(size); });
+
+  // Parse the format string to get the expected size of the buffer.
+  for (uint32_t lane = 0; lane < num_lanes; ++lane) {
+    if (!format[lane])
+      continue;
+
+    printf_core::WriteBuffer<
+        printf_core::WriteMode::FILL_BUFF_AND_DROP_OVERFLOW>
+        wb(nullptr, 0);
+    printf_core::Writer writer(wb);
+
+    internal::DummyArgList<packed> printf_args;
+    printf_core::Parser<internal::DummyArgList<packed> &> parser(
+        reinterpret_cast<const char *>(format[lane]), printf_args);
+
+    for (printf_core::FormatSection cur_section = parser.get_next_section();
+         !cur_section.raw_string.empty();
+         cur_section = parser.get_next_section())
+      ;
+    args_sizes[lane] = printf_args.read_count();
+  }
+  port.send([&](rpc::Buffer *buffer, uint32_t id) {
+    buffer->data[0] = args_sizes[id];
+  });
+  port.recv_n(args, args_sizes,
+              [&](uint64_t size) { return temp_storage.alloc(size); });
+
+  // Identify any arguments that are actually pointers to strings on the client.
+  // Additionally we want to determine how much buffer space we need to print.
+  TempVector<void *> strs_to_copy[num_lanes];
+  int buffer_size[num_lanes] = {0};
+  for (uint32_t lane = 0; lane < num_lanes; ++lane) {
+    if (!format[lane])
+      continue;
+
+    printf_core::WriteBuffer<
+        printf_core::WriteMode::FILL_BUFF_AND_DROP_OVERFLOW>
+        wb(nullptr, 0);
+    printf_core::Writer writer(wb);
+
+    internal::StructArgList<packed> printf_args(args[lane], args_sizes[lane]);
+    printf_core::Parser<internal::StructArgList<packed>> parser(
+        reinterpret_cast<const char *>(format[lane]), printf_args);
+
+    for (printf_core::FormatSection cur_section = parser.get_next_section();
+         !cur_section.raw_string.empty();
+         cur_section = parser.get_next_section()) {
+      if (cur_section.has_conv && cur_section.conv_name == 's' &&
+          cur_section.conv_val_ptr) {
+        strs_to_copy[lane].push_back(cur_section.conv_val_ptr);
+        // Get the minimum size of the string in the case of padding.
+        char c = '\0';
+        cur_section.conv_val_ptr = &c;
+        convert(&writer, cur_section);
+      } else if (cur_section.has_conv) {
+        // Ignore conversion errors for the first pass.
+        convert(&writer, cur_section);
+      } else {
+        writer.write(cur_section.raw_string);
+      }
+    }
+    buffer_size[lane] = writer.get_chars_written();
+  }
+
+  // Recieve any strings from the client and push them into a buffer.
+  TempVector<void *> copied_strs[num_lanes];
+  auto HasPendingCopies = [](TempVector<void *> v[num_lanes]) {
+    for (uint32_t i = 0; i < num_lanes; ++i)
+      if (!v[i].empty() && v[i].back())
+        return true;
+    return false;
+  };
+  while (HasPendingCopies(strs_to_copy)) {
+    port.send([&](rpc::Buffer *buffer, uint32_t id) {
+      void *ptr = !strs_to_copy[id].empty() ? strs_to_copy[id].back() : nullptr;
+      buffer->data[1] = reinterpret_cast<uintptr_t>(ptr);
+      if (!strs_to_copy[id].empty())
+        strs_to_copy[id].pop_back();
+    });
+    uint64_t str_sizes[num_lanes] = {0};
+    void *strs[num_lanes] = {nullptr};
+    port.recv_n(strs, str_sizes,
+                [&](uint64_t size) { return temp_storage.alloc(size); });
+    for (uint32_t lane = 0; lane < num_lanes; ++lane) {
+      if (!strs[lane])
+        continue;
+
+      copied_strs[lane].push_back(strs[lane]);
+      buffer_size[lane] += str_sizes[lane];
+    }
+  }
+
+  // Perform the final formatting and printing using the LLVM C library printf.
+  int results[num_lanes] = {0};
+  for (uint32_t lane = 0; lane < num_lanes; ++lane) {
+    if (!format[lane])
+      continue;
+
+    char *buffer = temp_storage.alloc(buffer_size[lane]);
+    printf_core::WriteBuffer<
+        printf_core::WriteMode::FILL_BUFF_AND_DROP_OVERFLOW>
+        wb(buffer, buffer_size[lane]);
+    printf_core::Writer writer(wb);
+
+    internal::StructArgList<packed> printf_args(args[lane], args_sizes[lane]);
+    printf_core::Parser<internal::StructArgList<packed>> parser(
+        reinterpret_cast<const char *>(format[lane]), printf_args);
+
+    // Parse and print the format string using the arguments we copied from
+    // the client.
+    int ret = 0;
+    for (printf_core::FormatSection cur_section = parser.get_next_section();
+         !cur_section.raw_string.empty();
+         cur_section = parser.get_next_section()) {
+      // If this argument was a string we use the memory buffer we copied from
+      // the client by replacing the raw pointer with the copied one.
+      if (cur_section.has_conv && cur_section.conv_name == 's') {
+        if (!copied_strs[lane].empty()) {
+          cur_section.conv_val_ptr = copied_strs[lane].back();
+          copied_strs[lane].pop_back();
+        } else {
+          cur_section.conv_val_ptr = nullptr;
+        }
+      }
+      if (cur_section.has_conv) {
+        ret = convert(&writer, cur_section);
+        if (ret == -1)
+          break;
+      } else {
+        writer.write(cur_section.raw_string);
+      }
+    }
+
+    results[lane] = static_cast<int>(
+        fwrite(buffer, 1, writer.get_chars_written(), files[lane]));
+    if (results[lane] != writer.get_chars_written() || ret == -1)
+      results[lane] = -1;
+  }
+
+  // Send the final return value and signal completion by setting the string
+  // argument to null.
+  port.send([&](rpc::Buffer *buffer, uint32_t id) {
+    buffer->data[0] = static_cast<uint64_t>(results[id]);
+    buffer->data[1] = reinterpret_cast<uintptr_t>(nullptr);
+  });
+}
+
+template <uint32_t num_lanes>
+LIBC_INLINE static rpc::Status handle_port_impl(rpc::Server::Port &port) {
+  TempStorage temp_storage;
+
+  switch (port.get_opcode()) {
+  case LIBC_WRITE_TO_STREAM:
+  case LIBC_WRITE_TO_STDERR:
+  case LIBC_WRITE_TO_STDOUT:
+  case LIBC_WRITE_TO_STDOUT_NEWLINE: {
+    uint64_t sizes[num_lanes] = {0};
+    void *strs[num_lanes] = {nullptr};
+    FILE *files[num_lanes] = {nullptr};
+    if (port.get_opcode() == LIBC_WRITE_TO_STREAM) {
+      port.recv([&](rpc::Buffer *buffer, uint32_t id) {
+        files[id] = reinterpret_cast<FILE *>(buffer->data[0]);
+      });
+    } else {
+      for (uint32_t i = 0; i < num_lanes; ++i)
+        files[i] = port.get_opcode() == LIBC_WRITE_TO_STDERR ? stderr : stdout;
+    }
+
+    port.recv_n(strs, sizes,
+                [&](uint64_t size) { return temp_storage.alloc(size); });
+    port.send([&](rpc::Buffer *buffer, uint32_t id) {
+      flockfile(files[id]);
+      buffer->data[0] = fwrite_unlocked(strs[id], 1, sizes[id], files[id]);
+      if (port.get_opcode() == LIBC_WRITE_TO_STDOUT_NEWLINE &&
+          buffer->data[0] == sizes[id])
+        buffer->data[0] += fwrite_unlocked("\n", 1, 1, files[id]);
+      funlockfile(files[id]);
+    });
+    break;
+  }
+  case LIBC_READ_FROM_STREAM: {
+    uint64_t sizes[num_lanes] = {0};
+    void *data[num_lanes] = {nullptr};
+    port.recv([&](rpc::Buffer *buffer, uint32_t id) {
+      data[id] = temp_storage.alloc(buffer->data[0]);
+      sizes[id] =
+          fread(data[id], 1, buffer->data[0], to_stream(buffer->data[1]));
+    });
+    port.send_n(data, sizes);
+    port.send([&](rpc::Buffer *buffer, uint32_t id) {
+      __builtin_memcpy(buffer->data, &sizes[id], sizeof(uint64_t));
+    });
+    break;
+  }
+  case LIBC_READ_FGETS: {
+    uint64_t sizes[num_lanes] = {0};
+    void *data[num_lanes] = {nullptr};
+    port.recv([&](rpc::Buffer *buffer, uint32_t id) {
+      data[id] = temp_storage.alloc(buffer->data[0]);
+      const char *str = ::fgets(reinterpret_cast<char *>(data[id]),
+                                static_cast<int>(buffer->data[0]),
+                                to_stream(buffer->data[1]));
+      sizes[id] = !str ? 0 : __builtin_strlen(str) + 1;
+    });
+    port.send_n(data, sizes);
+    break;
+  }
+  case LIBC_OPEN_FILE: {
+    uint64_t sizes[num_lanes] = {0};
+    void *paths[num_lanes] = {nullptr};
+    port.recv_n(paths, sizes,
+                [&](uint64_t size) { return temp_storage.alloc(size); });
+    port.recv_and_send([&](rpc::Buffer *buffer, uint32_t id) {
+      FILE *file = fopen(reinterpret_cast<char *>(paths[id]),
+                         reinterpret_cast<char *>(buffer->data));
+      buffer->data[0] = reinterpret_cast<uintptr_t>(file);
+    });
+    break;
+  }
+  case LIBC_CLOSE_FILE: {
+    port.recv_and_send([&](rpc::Buffer *buffer, uint32_t) {
+      FILE *file = reinterpret_cast<FILE *>(buffer->data[0]);
+      buffer->data[0] = ::fclose(file);
+    });
+    break;
+  }
+  case LIBC_EXIT: {
+    // Send a response to the client to signal that we are ready to exit.
+    port.recv_and_send([](rpc::Buffer *, uint32_t) {});
+    port.recv([](rpc::Buffer *buffer, uint32_t) {
+      int status = 0;
+      __builtin_memcpy(&status, buffer->data, sizeof(int));
+      exit(status);
+    });
+    break;
+  }
+  case LIBC_ABORT: {
+    // Send a response to the client to signal that we are ready to abort.
+    port.recv_and_send([](rpc::Buffer *, uint32_t) {});
+    port.recv([](rpc::Buffer *, uint32_t) {});
+    abort();
+    break;
+  }
+  case LIBC_HOST_CALL: {
+    uint64_t sizes[num_lanes] = {0};
+    unsigned long long results[num_lanes] = {0};
+    void *args[num_lanes] = {nullptr};
+    port.recv_n(args, sizes,
+                [&](uint64_t size) { return temp_storage.alloc(size); });
+    port.recv([&](rpc::Buffer *buffer, uint32_t id) {
+      using func_ptr_t = unsigned long long (*)(void *);
+      auto func = reinterpret_cast<func_ptr_t>(buffer->data[0]);
+      results[id] = func(args[id]);
+    });
+    port.send([&](rpc::Buffer *buffer, uint32_t id) {
+      buffer->data[0] = static_cast<uint64_t>(results[id]);
+    });
+    break;
+  }
+  case LIBC_FEOF: {
+    port.recv_and_send([](rpc::Buffer *buffer, uint32_t) {
+      buffer->data[0] = feof(to_stream(buffer->data[0]));
+    });
+    break;
+  }
+  case LIBC_FERROR: {
+    port.recv_and_send([](rpc::Buffer *buffer, uint32_t) {
+      buffer->data[0] = ferror(to_stream(buffer->data[0]));
+    });
+    break;
+  }
+  case LIBC_CLEARERR: {
+    port.recv_and_send([](rpc::Buffer *buffer, uint32_t) {
+      clearerr(to_stream(buffer->data[0]));
+    });
+    break;
+  }
+  case LIBC_FSEEK: {
+    port.recv_and_send([](rpc::Buffer *buffer, uint32_t) {
+      buffer->data[0] =
+          fseek(to_stream(buffer->data[0]), static_cast<long>(buffer->data[1]),
+                static_cast<int>(buffer->data[2]));
+    });
+    break;
+  }
+  case LIBC_FTELL: {
+    port.recv_and_send([](rpc::Buffer *buffer, uint32_t) {
+      buffer->data[0] = ftell(to_stream(buffer->data[0]));
+    });
+    break;
+  }
+  case LIBC_FFLUSH: {
+    port.recv_and_send([](rpc::Buffer *buffer, uint32_t) {
+      buffer->data[0] = fflush(to_stream(buffer->data[0]));
+    });
+    break;
+  }
+  case LIBC_UNGETC: {
+    port.recv_and_send([](rpc::Buffer *buffer, uint32_t) {
+      buffer->data[0] =
+          ungetc(static_cast<int>(buffer->data[0]), to_stream(buffer->data[1]));
+    });
+    break;
+  }
+  case LIBC_PRINTF_TO_STREAM_PACKED:
+  case LIBC_PRINTF_TO_STDOUT_PACKED:
+  case LIBC_PRINTF_TO_STDERR_PACKED: {
+    handle_printf<true, num_lanes>(port, temp_storage);
+    break;
+  }
+  case LIBC_PRINTF_TO_STREAM:
+  case LIBC_PRINTF_TO_STDOUT:
+  case LIBC_PRINTF_TO_STDERR: {
+    handle_printf<false, num_lanes>(port, temp_storage);
+    break;
+  }
+  case LIBC_REMOVE: {
+    uint64_t sizes[num_lanes] = {0};
+    void *args[num_lanes] = {nullptr};
+    port.recv_n(args, sizes,
+                [&](uint64_t size) { return temp_storage.alloc(size); });
+    port.send([&](rpc::Buffer *buffer, uint32_t id) {
+      buffer->data[0] = static_cast<uint64_t>(
+          remove(reinterpret_cast<const char *>(args[id])));
+    });
+    break;
+  }
+  case LIBC_RENAME: {
+    uint64_t oldsizes[num_lanes] = {0};
+    uint64_t newsizes[num_lanes] = {0};
+    void *oldpath[num_lanes] = {nullptr};
+    void *newpath[num_lanes] = {nullptr};
+    port.recv_n(oldpath, oldsizes,
+                [&](uint64_t size) { return temp_storage.alloc(size); });
+    port.recv_n(newpath, newsizes,
+                [&](uint64_t size) { return temp_storage.alloc(size); });
+    port.send([&](rpc::Buffer *buffer, uint32_t id) {
+      buffer->data[0] = static_cast<uint64_t>(
+          rename(reinterpret_cast<const char *>(oldpath[id]),
+                 reinterpret_cast<const char *>(newpath[id])));
+    });
+    break;
+  }
+  case LIBC_SYSTEM: {
+    uint64_t sizes[num_lanes] = {0};
+    void *args[num_lanes] = {nullptr};
+    port.recv_n(args, sizes,
+                [&](uint64_t size) { return temp_storage.alloc(size); });
+    port.send([&](rpc::Buffer *buffer, uint32_t id) {
+      buffer->data[0] = static_cast<uint64_t>(
+          system(reinterpret_cast<const char *>(args[id])));
+    });
+    break;
+  }
+  case LIBC_NOOP: {
+    port.recv([](rpc::Buffer *, uint32_t) {});
+    break;
+  }
+  default:
+    return rpc::RPC_UNHANDLED_OPCODE;
+  }
+
+  return rpc::RPC_SUCCESS;
+}
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
+
+namespace LIBC_NAMESPACE_DECL {
+namespace rpc {
+
+// Handles any opcode generated from the 'libc' client code.
+LIBC_INLINE ::rpc::Status handle_libc_opcodes(::rpc::Server::Port &port,
+                                              uint32_t num_lanes) {
+  switch (num_lanes) {
+  case 1:
+    return internal::handle_port_impl<1>(port);
+  case 32:
+    return internal::handle_port_impl<32>(port);
+  case 64:
+    return internal::handle_port_impl<64>(port);
+  default:
+    return ::rpc::RPC_ERROR;
+  }
+}
+
+} // namespace rpc
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_RPC_RPC_SERVER_H
diff --git a/contrib/llvm-project/libc/src/__support/StringUtil/error_to_string.cpp b/contrib/llvm-project/libc/src/__support/StringUtil/error_to_string.cpp
new file mode 100644
index 000000000000..3b22021706bb
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/StringUtil/error_to_string.cpp
@@ -0,0 +1,85 @@
+//===-- Implementation of a class for mapping errors to strings -----------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "error_to_string.h"
+#include "platform_errors.h"
+
+#include "src/__support/CPP/span.h"
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/CPP/stringstream.h"
+#include "src/__support/StringUtil/message_mapper.h"
+#include "src/__support/integer_to_string.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+#include <stddef.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+constexpr size_t max_buff_size() {
+  constexpr size_t unknown_str_len = sizeof("Unknown error");
+  // the buffer should be able to hold "Unknown error" + ' ' + num_str
+  return (unknown_str_len + 1 + IntegerToString<int>::buffer_size()) *
+         sizeof(char);
+}
+
+// This is to hold error strings that have to be custom built. It may be
+// rewritten on every call to strerror (or other error to string function).
+constexpr size_t ERR_BUFFER_SIZE = max_buff_size();
+LIBC_THREAD_LOCAL char error_buffer[ERR_BUFFER_SIZE];
+
+constexpr size_t TOTAL_STR_LEN = total_str_len(PLATFORM_ERRORS);
+
+// Since the StringMappings array is a map from error numbers to their
+// corresponding strings, we have to have an array large enough we can use the
+// error numbers as indexes. The current linux configuration has 132 values with
+// the maximum value being 133 (41 and 58 are skipped). If other platforms use
+// negative numbers or discontiguous ranges, then the array should be turned
+// into a proper hashmap.
+constexpr size_t ERR_ARRAY_SIZE = max_key_val(PLATFORM_ERRORS) + 1;
+
+constexpr MessageMapper<ERR_ARRAY_SIZE, TOTAL_STR_LEN>
+    ERROR_MAPPER(PLATFORM_ERRORS);
+
+constexpr MessageMapper<ERR_ARRAY_SIZE, TOTAL_STR_LEN>
+    ERRNO_NAME_MAPPER(PLATFORM_ERRNO_NAMES);
+
+cpp::string_view build_error_string(int err_num, cpp::span<char> buffer) {
+  // if the buffer can't hold "Unknown error" + ' ' + num_str, then just
+  // return "Unknown error".
+  if (buffer.size() <
+      (sizeof("Unknown error") + 1 + IntegerToString<int>::buffer_size()))
+    return const_cast<char *>("Unknown error");
+
+  cpp::StringStream buffer_stream(
+      {const_cast<char *>(buffer.data()), buffer.size()});
+  buffer_stream << "Unknown error" << ' ' << err_num << '\0';
+  return buffer_stream.str();
+}
+
+} // namespace internal
+
+cpp::string_view get_error_string(int err_num) {
+  return get_error_string(err_num,
+                          {internal::error_buffer, internal::ERR_BUFFER_SIZE});
+}
+
+cpp::string_view get_error_string(int err_num, cpp::span<char> buffer) {
+  auto opt_str = internal::ERROR_MAPPER.get_str(err_num);
+  if (opt_str)
+    return *opt_str;
+  else
+    return internal::build_error_string(err_num, buffer);
+}
+
+cpp::optional<cpp::string_view> try_get_errno_name(int err_num) {
+  return internal::ERRNO_NAME_MAPPER.get_str(err_num);
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/StringUtil/error_to_string.h b/contrib/llvm-project/libc/src/__support/StringUtil/error_to_string.h
new file mode 100644
index 000000000000..dfbd03f0703b
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/StringUtil/error_to_string.h
@@ -0,0 +1,27 @@
+//===-- Definition of a class for mapping errors to strings -----*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_ERROR_TO_STRING_H
+#define LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_ERROR_TO_STRING_H
+
+#include "src/__support/CPP/optional.h"
+#include "src/__support/CPP/span.h"
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+cpp::string_view get_error_string(int err_num);
+
+cpp::string_view get_error_string(int err_num, cpp::span<char> buffer);
+
+cpp::optional<cpp::string_view> try_get_errno_name(int err_num);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_ERROR_TO_STRING_H
diff --git a/contrib/llvm-project/libc/src/__support/StringUtil/message_mapper.h b/contrib/llvm-project/libc/src/__support/StringUtil/message_mapper.h
new file mode 100644
index 000000000000..df7506a2f3ec
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/StringUtil/message_mapper.h
@@ -0,0 +1,104 @@
+//===-- A class for number to string mappings -------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_MESSAGE_MAPPER_H
+#define LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_MESSAGE_MAPPER_H
+
+#include "src/__support/CPP/array.h"
+#include "src/__support/CPP/optional.h"
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/macros/config.h"
+#include <stddef.h>
+
+namespace LIBC_NAMESPACE_DECL {
+
+struct MsgMapping {
+  int num;
+  cpp::string_view msg;
+
+  constexpr MsgMapping() : num(0), msg() { ; }
+
+  constexpr MsgMapping(int init_num, const char *init_msg)
+      : num(init_num), msg(init_msg) {
+    ;
+  }
+};
+
+template <size_t N> using MsgTable = cpp::array<MsgMapping, N>;
+
+template <size_t N> constexpr size_t total_str_len(const MsgTable<N> &table) {
+  size_t total = 0;
+  for (size_t i = 0; i < table.size(); ++i) {
+    // add 1 for the null terminator.
+    total += table[i].msg.size() + 1;
+  }
+  return total;
+}
+
+template <size_t N> constexpr size_t max_key_val(const MsgTable<N> &table) {
+  int max = 0;
+  for (size_t i = 0; i < table.size(); ++i) {
+    if (table[i].num > max) {
+      max = table[i].num;
+    }
+  }
+  // max will never be negative since the starting value is 0. This is good,
+  // since it's used as a length.
+  return static_cast<size_t>(max);
+}
+
+template <size_t ARR_SIZE, size_t TOTAL_STR_LEN> class MessageMapper {
+  int msg_offsets[ARR_SIZE] = {-1};
+  char string_array[TOTAL_STR_LEN] = {'\0'};
+
+public:
+  template <size_t N> constexpr MessageMapper(const MsgTable<N> &table) {
+    cpp::string_view string_mappings[ARR_SIZE] = {""};
+    for (size_t i = 0; i < table.size(); ++i)
+      string_mappings[table[i].num] = table[i].msg;
+
+    int string_array_index = 0;
+    for (size_t cur_num = 0; cur_num < ARR_SIZE; ++cur_num) {
+      if (string_mappings[cur_num].size() != 0) {
+        msg_offsets[cur_num] = string_array_index;
+        // No need to replace with proper strcpy, this is evaluated at compile
+        // time.
+        for (size_t i = 0; i < string_mappings[cur_num].size() + 1;
+             ++i, ++string_array_index) {
+          string_array[string_array_index] = string_mappings[cur_num][i];
+        }
+      } else {
+        msg_offsets[cur_num] = -1;
+      }
+    }
+  }
+
+  cpp::optional<cpp::string_view> get_str(int num) const {
+    if (num >= 0 && static_cast<size_t>(num) < ARR_SIZE &&
+        msg_offsets[num] != -1) {
+      return {string_array + msg_offsets[num]};
+    } else {
+      return cpp::optional<cpp::string_view>();
+    }
+  }
+};
+
+template <size_t N1, size_t N2>
+constexpr MsgTable<N1 + N2> operator+(const MsgTable<N1> &t1,
+                                      const MsgTable<N2> &t2) {
+  MsgTable<N1 + N2> res{};
+  for (size_t i = 0; i < N1; ++i)
+    res[i] = t1[i];
+  for (size_t i = 0; i < N2; ++i)
+    res[N1 + i] = t2[i];
+  return res;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_MESSAGE_MAPPER_H
diff --git a/contrib/llvm-project/libc/src/__support/StringUtil/platform_errors.h b/contrib/llvm-project/libc/src/__support/StringUtil/platform_errors.h
new file mode 100644
index 000000000000..32e8414b3e3d
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/StringUtil/platform_errors.h
@@ -0,0 +1,18 @@
+//===-- The error table for the current platform ----------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_PLATFORM_ERRORS_H
+#define LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_PLATFORM_ERRORS_H
+
+#if defined(__linux__) || defined(__Fuchsia__)
+#include "tables/linux_platform_errors.h"
+#else
+#include "tables/minimal_platform_errors.h"
+#endif
+
+#endif // LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_PLATFORM_ERRORS_H
diff --git a/contrib/llvm-project/libc/src/__support/StringUtil/platform_signals.h b/contrib/llvm-project/libc/src/__support/StringUtil/platform_signals.h
new file mode 100644
index 000000000000..52da082649bf
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/StringUtil/platform_signals.h
@@ -0,0 +1,18 @@
+//===-- The signal table for the current platform ---------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_PLATFORM_SIGNALS_H
+#define LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_PLATFORM_SIGNALS_H
+
+#if defined(__linux__) || defined(__Fuchsia__)
+#include "tables/linux_platform_signals.h"
+#else
+#include "tables/minimal_platform_signals.h"
+#endif
+
+#endif // LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_PLATFORM_SIGNALS_H
diff --git a/contrib/llvm-project/libc/src/__support/StringUtil/signal_to_string.cpp b/contrib/llvm-project/libc/src/__support/StringUtil/signal_to_string.cpp
new file mode 100644
index 000000000000..b67d28814816
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/StringUtil/signal_to_string.cpp
@@ -0,0 +1,81 @@
+//===-- Implementation of a class for mapping signals to strings ----------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "signal_to_string.h"
+#include "platform_signals.h"
+
+#include "src/__support/CPP/span.h"
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/CPP/stringstream.h"
+#include "src/__support/StringUtil/message_mapper.h"
+#include "src/__support/integer_to_string.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+#include <signal.h>
+#include <stddef.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+constexpr size_t max_buff_size() {
+  constexpr size_t base_str_len = sizeof("Real-time signal");
+  // the buffer should be able to hold "Real-time signal" + ' ' + num_str
+  return (base_str_len + 1 + IntegerToString<int>::buffer_size()) *
+         sizeof(char);
+}
+
+// This is to hold signal strings that have to be custom built. It may be
+// rewritten on every call to strsignal (or other signal to string function).
+constexpr size_t SIG_BUFFER_SIZE = max_buff_size();
+LIBC_THREAD_LOCAL char signal_buffer[SIG_BUFFER_SIZE];
+
+constexpr size_t TOTAL_STR_LEN = total_str_len(PLATFORM_SIGNALS);
+
+constexpr size_t SIG_ARRAY_SIZE = max_key_val(PLATFORM_SIGNALS) + 1;
+
+constexpr MessageMapper<SIG_ARRAY_SIZE, TOTAL_STR_LEN>
+    signal_mapper(PLATFORM_SIGNALS);
+
+cpp::string_view build_signal_string(int sig_num, cpp::span<char> buffer) {
+  cpp::string_view base_str;
+  if (sig_num >= SIGRTMIN && sig_num <= SIGRTMAX) {
+    base_str = cpp::string_view("Real-time signal");
+    sig_num -= SIGRTMIN;
+  } else {
+    base_str = cpp::string_view("Unknown signal");
+  }
+
+  // if the buffer can't hold "Unknown signal" + ' ' + num_str, then just
+  // return "Unknown signal".
+  if (buffer.size() <
+      (base_str.size() + 1 + IntegerToString<int>::buffer_size()))
+    return base_str;
+
+  cpp::StringStream buffer_stream(
+      {const_cast<char *>(buffer.data()), buffer.size()});
+  buffer_stream << base_str << ' ' << sig_num << '\0';
+  return buffer_stream.str();
+}
+
+} // namespace internal
+
+cpp::string_view get_signal_string(int sig_num) {
+  return get_signal_string(
+      sig_num, {internal::signal_buffer, internal::SIG_BUFFER_SIZE});
+}
+
+cpp::string_view get_signal_string(int sig_num, cpp::span<char> buffer) {
+  auto opt_str = internal::signal_mapper.get_str(sig_num);
+  if (opt_str)
+    return *opt_str;
+  else
+    return internal::build_signal_string(sig_num, buffer);
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/StringUtil/signal_to_string.h b/contrib/llvm-project/libc/src/__support/StringUtil/signal_to_string.h
new file mode 100644
index 000000000000..a162486d134e
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/StringUtil/signal_to_string.h
@@ -0,0 +1,25 @@
+//===-- Function prototype for mapping signals to strings -------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_SIGNAL_TO_STRING_H
+#define LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_SIGNAL_TO_STRING_H
+
+#include "src/__support/CPP/span.h"
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+cpp::string_view get_signal_string(int err_num);
+
+cpp::string_view get_signal_string(int err_num, cpp::span<char> buffer);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_SIGNAL_TO_STRING_H
diff --git a/contrib/llvm-project/libc/src/__support/StringUtil/tables/linux_extension_errors.h b/contrib/llvm-project/libc/src/__support/StringUtil/tables/linux_extension_errors.h
new file mode 100644
index 000000000000..de637d60bea9
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/StringUtil/tables/linux_extension_errors.h
@@ -0,0 +1,130 @@
+//===-- Map of Linux extension error numbers to strings ---------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_LINUX_EXTENSION_ERRORS_H
+#define LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_LINUX_EXTENSION_ERRORS_H
+
+#include "src/__support/StringUtil/message_mapper.h"
+#include "src/__support/libc_errno.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+constexpr MsgTable<52> LINUX_ERRORS = {
+    MsgMapping(ENOTBLK, "Block device required"),
+    MsgMapping(ECHRNG, "Channel number out of range"),
+    MsgMapping(EL2NSYNC, "Level 2 not synchronized"),
+    MsgMapping(EL3HLT, "Level 3 halted"),
+    MsgMapping(EL3RST, "Level 3 reset"),
+    MsgMapping(ELNRNG, "Link number out of range"),
+    MsgMapping(EUNATCH, "Protocol driver not attached"),
+    MsgMapping(ENOCSI, "No CSI structure available"),
+    MsgMapping(EL2HLT, "Level 2 halted"),
+    MsgMapping(EBADE, "Invalid exchange"),
+    MsgMapping(EBADR, "Invalid request descriptor"),
+    MsgMapping(EXFULL, "Exchange full"),
+    MsgMapping(ENOANO, "No anode"),
+    MsgMapping(EBADRQC, "Invalid request code"),
+    MsgMapping(EBADSLT, "Invalid slot"),
+    MsgMapping(EBFONT, "Bad font file format"),
+    MsgMapping(ENONET, "Machine is not on the network"),
+    MsgMapping(ENOPKG, "Package not installed"),
+    MsgMapping(EREMOTE, "Object is remote"),
+    MsgMapping(EADV, "Advertise error"),
+    MsgMapping(ESRMNT, "Srmount error"),
+    MsgMapping(ECOMM, "Communication error on send"),
+    MsgMapping(EDOTDOT, "RFS specific error"),
+    MsgMapping(ENOTUNIQ, "Name not unique on network"),
+    MsgMapping(EBADFD, "File descriptor in bad state"),
+    MsgMapping(EREMCHG, "Remote address changed"),
+    MsgMapping(ELIBACC, "Can not access a needed shared library"),
+    MsgMapping(ELIBBAD, "Accessing a corrupted shared library"),
+    MsgMapping(ELIBSCN, ".lib section in a.out corrupted"),
+    MsgMapping(ELIBMAX, "Attempting to link in too many shared libraries"),
+    MsgMapping(ELIBEXEC, "Cannot exec a shared library directly"),
+    MsgMapping(ERESTART, "Interrupted system call should be restarted"),
+    MsgMapping(ESTRPIPE, "Streams pipe error"),
+    MsgMapping(EUSERS, "Too many users"),
+    MsgMapping(ESOCKTNOSUPPORT, "Socket type not supported"),
+    MsgMapping(EPFNOSUPPORT, "Protocol family not supported"),
+    MsgMapping(ESHUTDOWN, "Cannot send after transport endpoint shutdown"),
+    MsgMapping(ETOOMANYREFS, "Too many references: cannot splice"),
+    MsgMapping(EHOSTDOWN, "Host is down"),
+    MsgMapping(EUCLEAN, "Structure needs cleaning"),
+    MsgMapping(ENOTNAM, "Not a XENIX named type file"),
+    MsgMapping(ENAVAIL, "No XENIX semaphores available"),
+    MsgMapping(EISNAM, "Is a named type file"),
+    MsgMapping(EREMOTEIO, "Remote I/O error"),
+    MsgMapping(ENOMEDIUM, "No medium found"),
+    MsgMapping(EMEDIUMTYPE, "Wrong medium type"),
+    MsgMapping(ENOKEY, "Required key not available"),
+    MsgMapping(EKEYEXPIRED, "Key has expired"),
+    MsgMapping(EKEYREVOKED, "Key has been revoked"),
+    MsgMapping(EKEYREJECTED, "Key was rejected by service"),
+    MsgMapping(ERFKILL, "Operation not possible due to RF-kill"),
+    MsgMapping(EHWPOISON, "Memory page has hardware error"),
+};
+
+constexpr MsgTable<52> LINUX_ERRNO_NAMES = {
+    MsgMapping(ENOTBLK, "ENOTBLK"),
+    MsgMapping(ECHRNG, "ECHRNG"),
+    MsgMapping(EL2NSYNC, "EL2NSYNC"),
+    MsgMapping(EL3HLT, "EL3HLT"),
+    MsgMapping(EL3RST, "EL3RST"),
+    MsgMapping(ELNRNG, "ELNRNG"),
+    MsgMapping(EUNATCH, "EUNATCH"),
+    MsgMapping(ENOCSI, "ENOCSI"),
+    MsgMapping(EL2HLT, "EL2HLT"),
+    MsgMapping(EBADE, "EBADE"),
+    MsgMapping(EBADR, "EBADR"),
+    MsgMapping(EXFULL, "EXFULL"),
+    MsgMapping(ENOANO, "ENOANO"),
+    MsgMapping(EBADRQC, "EBADRQC"),
+    MsgMapping(EBADSLT, "EBADSLT"),
+    MsgMapping(EBFONT, "EBFONT"),
+    MsgMapping(ENONET, "ENONET"),
+    MsgMapping(ENOPKG, "ENOPKG"),
+    MsgMapping(EREMOTE, "EREMOTE"),
+    MsgMapping(EADV, "EADV"),
+    MsgMapping(ESRMNT, "ESRMNT"),
+    MsgMapping(ECOMM, "ECOMM"),
+    MsgMapping(EDOTDOT, "EDOTDOT"),
+    MsgMapping(ENOTUNIQ, "ENOTUNIQ"),
+    MsgMapping(EBADFD, "EBADFD"),
+    MsgMapping(EREMCHG, "EREMCHG"),
+    MsgMapping(ELIBACC, "ELIBACC"),
+    MsgMapping(ELIBBAD, "ELIBBAD"),
+    MsgMapping(ELIBSCN, "ELIBSCN"),
+    MsgMapping(ELIBMAX, "ELIBMAX"),
+    MsgMapping(ELIBEXEC, "ELIBEXEC"),
+    MsgMapping(ERESTART, "ERESTART"),
+    MsgMapping(ESTRPIPE, "ESTRPIPE"),
+    MsgMapping(EUSERS, "EUSERS"),
+    MsgMapping(ESOCKTNOSUPPORT, "ESOCKTNOSUPPORT"),
+    MsgMapping(EPFNOSUPPORT, "EPFNOSUPPORT"),
+    MsgMapping(ESHUTDOWN, "ESHUTDOWN"),
+    MsgMapping(ETOOMANYREFS, "ETOOMANYREFS"),
+    MsgMapping(EHOSTDOWN, "EHOSTDOWN"),
+    MsgMapping(EUCLEAN, "EUCLEAN"),
+    MsgMapping(ENOTNAM, "ENOTNAM"),
+    MsgMapping(ENAVAIL, "ENAVAIL"),
+    MsgMapping(EISNAM, "EISNAM"),
+    MsgMapping(EREMOTEIO, "EREMOTEIO"),
+    MsgMapping(ENOMEDIUM, "ENOMEDIUM"),
+    MsgMapping(EMEDIUMTYPE, "EMEDIUMTYPE"),
+    MsgMapping(ENOKEY, "ENOKEY"),
+    MsgMapping(EKEYEXPIRED, "EKEYEXPIRED"),
+    MsgMapping(EKEYREVOKED, "EKEYREVOKED"),
+    MsgMapping(EKEYREJECTED, "EKEYREJECTED"),
+    MsgMapping(ERFKILL, "ERFKILL"),
+    MsgMapping(EHWPOISON, "EHWPOISON"),
+};
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_LINUX_EXTENSION_ERRORS_H
diff --git a/contrib/llvm-project/libc/src/__support/StringUtil/tables/linux_extension_signals.h b/contrib/llvm-project/libc/src/__support/StringUtil/tables/linux_extension_signals.h
new file mode 100644
index 000000000000..c9cb26b785a1
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/StringUtil/tables/linux_extension_signals.h
@@ -0,0 +1,34 @@
+//===-- Map of Linux extension signal numbers to strings --------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_LINUX_EXTENSION_SIGNALS_H
+#define LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_LINUX_EXTENSION_SIGNALS_H
+
+#include "src/__support/StringUtil/message_mapper.h"
+#include "src/__support/macros/config.h"
+
+#include <signal.h> // For signal numbers
+
+namespace LIBC_NAMESPACE_DECL {
+
+// The array being larger than necessary isn't a problem. The MsgMappings will
+// be set to their default state which maps 0 to an empty string. This will get
+// filtered out in the MessageMapper building stage.
+LIBC_INLINE_VAR constexpr const MsgTable<3> LINUX_SIGNALS = {
+#ifdef SIGSTKFLT
+    MsgMapping(SIGSTKFLT, "Stack fault"), // unused
+#endif
+    MsgMapping(SIGWINCH, "Window changed"),
+#ifdef SIGPWR
+    MsgMapping(SIGPWR, "Power failure"), // ignored
+#endif
+};
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_LINUX_EXTENSION_SIGNALS_H
diff --git a/contrib/llvm-project/libc/src/__support/StringUtil/tables/linux_platform_errors.h b/contrib/llvm-project/libc/src/__support/StringUtil/tables/linux_platform_errors.h
new file mode 100644
index 000000000000..ce5ee380d6b5
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/StringUtil/tables/linux_platform_errors.h
@@ -0,0 +1,27 @@
+//===-- Map of error numbers to strings for the Linux platform --*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_LINUX_PLATFORM_ERRORS_H
+#define LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_LINUX_PLATFORM_ERRORS_H
+
+#include "linux_extension_errors.h"
+#include "posix_errors.h"
+#include "src/__support/macros/config.h"
+#include "stdc_errors.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LIBC_INLINE_VAR constexpr auto PLATFORM_ERRORS =
+    STDC_ERRORS + POSIX_ERRORS + LINUX_ERRORS;
+
+LIBC_INLINE_VAR constexpr auto PLATFORM_ERRNO_NAMES =
+    STDC_ERRNO_NAMES + POSIX_ERRNO_NAMES + LINUX_ERRNO_NAMES;
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_LINUX_PLATFORM_ERRORS_H
diff --git a/contrib/llvm-project/libc/src/__support/StringUtil/tables/linux_platform_signals.h b/contrib/llvm-project/libc/src/__support/StringUtil/tables/linux_platform_signals.h
new file mode 100644
index 000000000000..7c816aaf504f
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/StringUtil/tables/linux_platform_signals.h
@@ -0,0 +1,24 @@
+//===-- Map of error numbers to strings for the Linux platform --*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_LINUX_PLATFORM_SIGNALS_H
+#define LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_LINUX_PLATFORM_SIGNALS_H
+
+#include "linux_extension_signals.h"
+#include "posix_signals.h"
+#include "src/__support/macros/config.h"
+#include "stdc_signals.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LIBC_INLINE_VAR constexpr auto PLATFORM_SIGNALS =
+    STDC_SIGNALS + POSIX_SIGNALS + LINUX_SIGNALS;
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_LINUX_PLATFORM_SIGNALS_H
diff --git a/contrib/llvm-project/libc/src/__support/StringUtil/tables/minimal_platform_errors.h b/contrib/llvm-project/libc/src/__support/StringUtil/tables/minimal_platform_errors.h
new file mode 100644
index 000000000000..a9dcb365ca11
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/StringUtil/tables/minimal_platform_errors.h
@@ -0,0 +1,23 @@
+//===-- Map of error numbers to strings for a stdc platform -----*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_MINIMAL_PLATFORM_ERRORS_H
+#define LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_MINIMAL_PLATFORM_ERRORS_H
+
+#include "src/__support/macros/config.h"
+#include "stdc_errors.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LIBC_INLINE_VAR constexpr auto PLATFORM_ERRORS = STDC_ERRORS;
+
+LIBC_INLINE_VAR constexpr auto PLATFORM_ERRNO_NAMES = STDC_ERRNO_NAMES;
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_MINIMAL_PLATFORM_ERRORS_H
diff --git a/contrib/llvm-project/libc/src/__support/StringUtil/tables/minimal_platform_signals.h b/contrib/llvm-project/libc/src/__support/StringUtil/tables/minimal_platform_signals.h
new file mode 100644
index 000000000000..d4cecb3b35e5
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/StringUtil/tables/minimal_platform_signals.h
@@ -0,0 +1,21 @@
+//===-- Map of error numbers to strings for a stdc platform -----*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_MINIMAL_PLATFORM_SIGNALS_H
+#define LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_MINIMAL_PLATFORM_SIGNALS_H
+
+#include "src/__support/macros/config.h"
+#include "stdc_signals.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LIBC_INLINE_VAR constexpr auto PLATFORM_SIGNALS = STDC_SIGNALS;
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_MINIMAL_PLATFORM_SIGNALS_H
diff --git a/contrib/llvm-project/libc/src/__support/StringUtil/tables/posix_errors.h b/contrib/llvm-project/libc/src/__support/StringUtil/tables/posix_errors.h
new file mode 100644
index 000000000000..b21f28f0b132
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/StringUtil/tables/posix_errors.h
@@ -0,0 +1,178 @@
+//===-- Map of POSIX error numbers to strings -------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_POSIX_ERRORS_H
+#define LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_POSIX_ERRORS_H
+
+#include "hdr/errno_macros.h"
+#include "src/__support/StringUtil/message_mapper.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LIBC_INLINE_VAR constexpr MsgTable<76> POSIX_ERRORS = {
+    MsgMapping(EPERM, "Operation not permitted"),
+    MsgMapping(ENOENT, "No such file or directory"),
+    MsgMapping(ESRCH, "No such process"),
+    MsgMapping(EINTR, "Interrupted system call"),
+    MsgMapping(EIO, "Input/output error"),
+    MsgMapping(ENXIO, "No such device or address"),
+    MsgMapping(E2BIG, "Argument list too long"),
+    MsgMapping(ENOEXEC, "Exec format error"),
+    MsgMapping(EBADF, "Bad file descriptor"),
+    MsgMapping(ECHILD, "No child processes"),
+    MsgMapping(EAGAIN, "Resource temporarily unavailable"),
+    MsgMapping(ENOMEM, "Cannot allocate memory"),
+    MsgMapping(EACCES, "Permission denied"),
+    MsgMapping(EFAULT, "Bad address"),
+    MsgMapping(EBUSY, "Device or resource busy"),
+    MsgMapping(EEXIST, "File exists"),
+    MsgMapping(EXDEV, "Invalid cross-device link"),
+    MsgMapping(ENODEV, "No such device"),
+    MsgMapping(ENOTDIR, "Not a directory"),
+    MsgMapping(EISDIR, "Is a directory"),
+    MsgMapping(EINVAL, "Invalid argument"),
+    MsgMapping(ENFILE, "Too many open files in system"),
+    MsgMapping(EMFILE, "Too many open files"),
+    MsgMapping(ENOTTY, "Inappropriate ioctl for device"),
+    MsgMapping(ETXTBSY, "Text file busy"),
+    MsgMapping(EFBIG, "File too large"),
+    MsgMapping(ENOSPC, "No space left on device"),
+    MsgMapping(ESPIPE, "Illegal seek"),
+    MsgMapping(EROFS, "Read-only file system"),
+    MsgMapping(EMLINK, "Too many links"),
+    MsgMapping(EPIPE, "Broken pipe"),
+    MsgMapping(EDEADLK, "Resource deadlock avoided"),
+    MsgMapping(ENAMETOOLONG, "File name too long"),
+    MsgMapping(ENOLCK, "No locks available"),
+    MsgMapping(ENOSYS, "Function not implemented"),
+    MsgMapping(ENOTEMPTY, "Directory not empty"),
+    MsgMapping(ELOOP, "Too many levels of symbolic links"),
+    MsgMapping(ENOMSG, "No message of desired type"),
+    MsgMapping(EIDRM, "Identifier removed"),
+    MsgMapping(ENOSTR, "Device not a stream"),
+    MsgMapping(ENODATA, "No data available"),
+    MsgMapping(ETIME, "Timer expired"),
+    MsgMapping(ENOSR, "Out of streams resources"),
+    MsgMapping(ENOLINK, "Link has been severed"),
+    MsgMapping(EPROTO, "Protocol error"),
+    MsgMapping(EMULTIHOP, "Multihop attempted"),
+    MsgMapping(EBADMSG, "Bad message"),
+    MsgMapping(EOVERFLOW, "Value too large for defined data type"),
+    MsgMapping(ENOTSOCK, "Socket operation on non-socket"),
+    MsgMapping(EDESTADDRREQ, "Destination address required"),
+    MsgMapping(EMSGSIZE, "Message too long"),
+    MsgMapping(EPROTOTYPE, "Protocol wrong type for socket"),
+    MsgMapping(ENOPROTOOPT, "Protocol not available"),
+    MsgMapping(EPROTONOSUPPORT, "Protocol not supported"),
+    MsgMapping(ENOTSUP, "Operation not supported"),
+    MsgMapping(EAFNOSUPPORT, "Address family not supported by protocol"),
+    MsgMapping(EADDRINUSE, "Address already in use"),
+    MsgMapping(EADDRNOTAVAIL, "Cannot assign requested address"),
+    MsgMapping(ENETDOWN, "Network is down"),
+    MsgMapping(ENETUNREACH, "Network is unreachable"),
+    MsgMapping(ENETRESET, "Network dropped connection on reset"),
+    MsgMapping(ECONNABORTED, "Software caused connection abort"),
+    MsgMapping(ECONNRESET, "Connection reset by peer"),
+    MsgMapping(ENOBUFS, "No buffer space available"),
+    MsgMapping(EISCONN, "Transport endpoint is already connected"),
+    MsgMapping(ENOTCONN, "Transport endpoint is not connected"),
+    MsgMapping(ETIMEDOUT, "Connection timed out"),
+    MsgMapping(ECONNREFUSED, "Connection refused"),
+    MsgMapping(EHOSTUNREACH, "No route to host"),
+    MsgMapping(EALREADY, "Operation already in progress"),
+    MsgMapping(EINPROGRESS, "Operation now in progress"),
+    MsgMapping(ESTALE, "Stale file handle"),
+    MsgMapping(EDQUOT, "Disk quota exceeded"),
+    MsgMapping(ECANCELED, "Operation canceled"),
+    MsgMapping(EOWNERDEAD, "Owner died"),
+    MsgMapping(ENOTRECOVERABLE, "State not recoverable"),
+};
+
+LIBC_INLINE_VAR constexpr MsgTable<76> POSIX_ERRNO_NAMES = {
+    MsgMapping(EPERM, "EPERM"),
+    MsgMapping(ENOENT, "ENOENT"),
+    MsgMapping(ESRCH, "ESRCH"),
+    MsgMapping(EINTR, "EINTR"),
+    MsgMapping(EIO, "EIO"),
+    MsgMapping(ENXIO, "ENXIO"),
+    MsgMapping(E2BIG, "E2BIG"),
+    MsgMapping(ENOEXEC, "ENOEXEC"),
+    MsgMapping(EBADF, "EBADF"),
+    MsgMapping(ECHILD, "ECHILD"),
+    MsgMapping(EAGAIN, "EAGAIN"),
+    MsgMapping(ENOMEM, "ENOMEM"),
+    MsgMapping(EACCES, "EACCES"),
+    MsgMapping(EFAULT, "EFAULT"),
+    MsgMapping(EBUSY, "EBUSY"),
+    MsgMapping(EEXIST, "EEXIST"),
+    MsgMapping(EXDEV, "EXDEV"),
+    MsgMapping(ENODEV, "ENODEV"),
+    MsgMapping(ENOTDIR, "ENOTDIR"),
+    MsgMapping(EISDIR, "EISDIR"),
+    MsgMapping(EINVAL, "EINVAL"),
+    MsgMapping(ENFILE, "ENFILE"),
+    MsgMapping(EMFILE, "EMFILE"),
+    MsgMapping(ENOTTY, "ENOTTY"),
+    MsgMapping(ETXTBSY, "ETXTBSY"),
+    MsgMapping(EFBIG, "EFBIG"),
+    MsgMapping(ENOSPC, "ENOSPC"),
+    MsgMapping(ESPIPE, "ESPIPE"),
+    MsgMapping(EROFS, "EROFS"),
+    MsgMapping(EMLINK, "EMLINK"),
+    MsgMapping(EPIPE, "EPIPE"),
+    MsgMapping(EDEADLK, "EDEADLK"),
+    MsgMapping(ENAMETOOLONG, "ENAMETOOLONG"),
+    MsgMapping(ENOLCK, "ENOLCK"),
+    MsgMapping(ENOSYS, "ENOSYS"),
+    MsgMapping(ENOTEMPTY, "ENOTEMPTY"),
+    MsgMapping(ELOOP, "ELOOP"),
+    MsgMapping(ENOMSG, "ENOMSG"),
+    MsgMapping(EIDRM, "EIDRM"),
+    MsgMapping(ENOSTR, "ENOSTR"),
+    MsgMapping(ENODATA, "ENODATA"),
+    MsgMapping(ETIME, "ETIME"),
+    MsgMapping(ENOSR, "ENOSR"),
+    MsgMapping(ENOLINK, "ENOLINK"),
+    MsgMapping(EPROTO, "EPROTO"),
+    MsgMapping(EMULTIHOP, "EMULTIHOP"),
+    MsgMapping(EBADMSG, "EBADMSG"),
+    MsgMapping(EOVERFLOW, "EOVERFLOW"),
+    MsgMapping(ENOTSOCK, "ENOTSOCK"),
+    MsgMapping(EDESTADDRREQ, "EDESTADDRREQ"),
+    MsgMapping(EMSGSIZE, "EMSGSIZE"),
+    MsgMapping(EPROTOTYPE, "EPROTOTYPE"),
+    MsgMapping(ENOPROTOOPT, "ENOPROTOOPT"),
+    MsgMapping(EPROTONOSUPPORT, "EPROTONOSUPPORT"),
+    MsgMapping(ENOTSUP, "ENOTSUP"),
+    MsgMapping(EAFNOSUPPORT, "EAFNOSUPPORT"),
+    MsgMapping(EADDRINUSE, "EADDRINUSE"),
+    MsgMapping(EADDRNOTAVAIL, "EADDRNOTAVAIL"),
+    MsgMapping(ENETDOWN, "ENETDOWN"),
+    MsgMapping(ENETUNREACH, "ENETUNREACH"),
+    MsgMapping(ENETRESET, "ENETRESET"),
+    MsgMapping(ECONNABORTED, "ECONNABORTED"),
+    MsgMapping(ECONNRESET, "ECONNRESET"),
+    MsgMapping(ENOBUFS, "ENOBUFS"),
+    MsgMapping(EISCONN, "EISCONN"),
+    MsgMapping(ENOTCONN, "ENOTCONN"),
+    MsgMapping(ETIMEDOUT, "ETIMEDOUT"),
+    MsgMapping(ECONNREFUSED, "ECONNREFUSED"),
+    MsgMapping(EHOSTUNREACH, "EHOSTUNREACH"),
+    MsgMapping(EALREADY, "EALREADY"),
+    MsgMapping(EINPROGRESS, "EINPROGRESS"),
+    MsgMapping(ESTALE, "ESTALE"),
+    MsgMapping(EDQUOT, "EDQUOT"),
+    MsgMapping(ECANCELED, "ECANCELED"),
+    MsgMapping(EOWNERDEAD, "EOWNERDEAD"),
+    MsgMapping(ENOTRECOVERABLE, "ENOTRECOVERABLE"),
+};
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_POSIX_ERRORS_H
diff --git a/contrib/llvm-project/libc/src/__support/StringUtil/tables/posix_signals.h b/contrib/llvm-project/libc/src/__support/StringUtil/tables/posix_signals.h
new file mode 100644
index 000000000000..7c70f71837e2
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/StringUtil/tables/posix_signals.h
@@ -0,0 +1,47 @@
+//===-- Map of POSIX signal numbers to strings ------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_POSIX_SIGNALS_H
+#define LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_POSIX_SIGNALS_H
+
+#include "src/__support/CPP/array.h"
+#include "src/__support/StringUtil/message_mapper.h"
+#include "src/__support/macros/config.h"
+
+#include <signal.h> // For signal numbers
+
+namespace LIBC_NAMESPACE_DECL {
+
+LIBC_INLINE_VAR constexpr MsgTable<22> POSIX_SIGNALS = {
+    MsgMapping(SIGHUP, "Hangup"),
+    MsgMapping(SIGQUIT, "Quit"),
+    MsgMapping(SIGTRAP, "Trace/breakpoint trap"),
+    MsgMapping(SIGBUS, "Bus error"),
+    MsgMapping(SIGKILL, "Killed"),
+    MsgMapping(SIGUSR1, "User defined signal 1"),
+    MsgMapping(SIGUSR2, "User defined signal 2"),
+    MsgMapping(SIGPIPE, "Broken pipe"),
+    MsgMapping(SIGALRM, "Alarm clock"),
+    MsgMapping(SIGCHLD, "Child exited"),
+    MsgMapping(SIGCONT, "Continued"),
+    MsgMapping(SIGSTOP, "Stopped (signal)"),
+    MsgMapping(SIGTSTP, "Stopped"),
+    MsgMapping(SIGTTIN, "Stopped (tty input)"),
+    MsgMapping(SIGTTOU, "Stopped (tty output)"),
+    MsgMapping(SIGURG, "Urgent I/O condition"),
+    MsgMapping(SIGXCPU, "CPU time limit exceeded"),
+    MsgMapping(SIGXFSZ, "File size limit exceeded"),
+    MsgMapping(SIGVTALRM, "Virtual timer expired"),
+    MsgMapping(SIGPROF, "Profiling timer expired"),
+    MsgMapping(SIGPOLL, "I/O possible"),
+    MsgMapping(SIGSYS, "Bad system call"),
+};
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_POSIX_SIGNALS_H
diff --git a/contrib/llvm-project/libc/src/__support/StringUtil/tables/signal_table.h b/contrib/llvm-project/libc/src/__support/StringUtil/tables/signal_table.h
new file mode 100644
index 000000000000..bfec39b52f1a
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/StringUtil/tables/signal_table.h
@@ -0,0 +1,42 @@
+//===-- Map from signal numbers to strings ----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_SIGNAL_TABLE_H
+#define LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_SIGNAL_TABLE_H
+
+#include "src/__support/StringUtil/message_mapper.h"
+
+#include "posix_signals.h"
+#include "src/__support/macros/config.h"
+#include "stdc_signals.h"
+
+#if defined(__linux__) || defined(__Fuchsia__)
+#define USE_LINUX_PLATFORM_SIGNALS 1
+#else
+#define USE_LINUX_PLATFORM_SIGNALS 0
+#endif
+
+#if USE_LINUX_PLATFORM_SIGNALS
+#include "linux_extension_signals.h"
+#endif
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+LIBC_INLINE_VAR constexpr auto PLATFORM_SIGNALS = []() {
+  if constexpr (USE_LINUX_PLATFORM_SIGNALS) {
+    return STDC_SIGNALS + POSIX_SIGNALS + LINUX_SIGNALS;
+  } else {
+    return STDC_SIGNALS;
+  }
+}();
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_SIGNAL_TABLE_H
diff --git a/contrib/llvm-project/libc/src/__support/StringUtil/tables/stdc_errors.h b/contrib/llvm-project/libc/src/__support/StringUtil/tables/stdc_errors.h
new file mode 100644
index 000000000000..a326616f20ef
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/StringUtil/tables/stdc_errors.h
@@ -0,0 +1,34 @@
+//===-- Map of C standard error numbers to strings --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_STDC_ERRORS_H
+#define LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_STDC_ERRORS_H
+
+#include "hdr/errno_macros.h"
+#include "src/__support/StringUtil/message_mapper.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LIBC_INLINE_VAR constexpr const MsgTable<4> STDC_ERRORS = {
+    MsgMapping(0, "Success"),
+    MsgMapping(EDOM, "Numerical argument out of domain"),
+    MsgMapping(ERANGE, "Numerical result out of range"),
+    MsgMapping(EILSEQ, "Invalid or incomplete multibyte or wide character"),
+};
+
+LIBC_INLINE_VAR constexpr const MsgTable<4> STDC_ERRNO_NAMES = {
+    MsgMapping(0, "0"),
+    MsgMapping(EDOM, "EDOM"),
+    MsgMapping(ERANGE, "ERANGE"),
+    MsgMapping(EILSEQ, "EILSEQ"),
+};
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_STDC_ERRORS_H
diff --git a/contrib/llvm-project/libc/src/__support/StringUtil/tables/stdc_signals.h b/contrib/llvm-project/libc/src/__support/StringUtil/tables/stdc_signals.h
new file mode 100644
index 000000000000..094b59b4ba64
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/StringUtil/tables/stdc_signals.h
@@ -0,0 +1,30 @@
+//===-- Map of C standard signal numbers to strings -------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_STDC_SIGNALS_H
+#define LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_STDC_SIGNALS_H
+
+#include <signal.h> // For signal numbers
+
+#include "src/__support/StringUtil/message_mapper.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LIBC_INLINE_VAR constexpr const MsgTable<6> STDC_SIGNALS = {
+    MsgMapping(SIGINT, "Interrupt"),
+    MsgMapping(SIGILL, "Illegal instruction"),
+    MsgMapping(SIGABRT, "Aborted"),
+    MsgMapping(SIGFPE, "Floating point exception"),
+    MsgMapping(SIGSEGV, "Segmentation fault"),
+    MsgMapping(SIGTERM, "Terminated"),
+};
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_TABLES_STDC_SIGNALS_H
diff --git a/contrib/llvm-project/libc/src/__support/arg_list.h b/contrib/llvm-project/libc/src/__support/arg_list.h
new file mode 100644
index 000000000000..66afa67e320b
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/arg_list.h
@@ -0,0 +1,140 @@
+//===-- Holder Class for manipulating va_lists ------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_ARG_LIST_H
+#define LLVM_LIBC_SRC___SUPPORT_ARG_LIST_H
+
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+template <typename V, typename A>
+LIBC_INLINE constexpr V align_up(V val, A align) {
+  return ((val + V(align) - 1) / V(align)) * V(align);
+}
+
+class ArgList {
+  va_list vlist;
+
+public:
+  LIBC_INLINE ArgList(va_list vlist) { va_copy(this->vlist, vlist); }
+  LIBC_INLINE ArgList(ArgList &other) { va_copy(this->vlist, other.vlist); }
+  LIBC_INLINE ~ArgList() { va_end(this->vlist); }
+
+  LIBC_INLINE ArgList &operator=(ArgList &rhs) {
+    va_copy(vlist, rhs.vlist);
+    return *this;
+  }
+
+  template <class T> LIBC_INLINE T next_var() { return va_arg(vlist, T); }
+};
+
+// Used for testing things that use an ArgList when it's impossible to know what
+// the arguments should be ahead of time. An example of this would be fuzzing,
+// since a function passed a random input could request unpredictable arguments.
+class MockArgList {
+  size_t arg_counter = 0;
+
+public:
+  LIBC_INLINE MockArgList() = default;
+  LIBC_INLINE MockArgList(va_list) { ; }
+  LIBC_INLINE MockArgList(MockArgList &other) {
+    arg_counter = other.arg_counter;
+  }
+  LIBC_INLINE ~MockArgList() = default;
+
+  LIBC_INLINE MockArgList &operator=(MockArgList &rhs) {
+    arg_counter = rhs.arg_counter;
+    return *this;
+  }
+
+  template <class T> LIBC_INLINE T next_var() {
+    arg_counter++;
+    return T(arg_counter);
+  }
+
+  size_t read_count() const { return arg_counter; }
+};
+
+// Used by the GPU implementation to parse how many bytes need to be read from
+// the variadic argument buffer.
+template <bool packed> class DummyArgList {
+  size_t arg_counter = 0;
+
+public:
+  LIBC_INLINE DummyArgList() = default;
+  LIBC_INLINE DummyArgList(va_list) { ; }
+  LIBC_INLINE DummyArgList(DummyArgList &other) {
+    arg_counter = other.arg_counter;
+  }
+  LIBC_INLINE ~DummyArgList() = default;
+
+  LIBC_INLINE DummyArgList &operator=(DummyArgList &rhs) {
+    arg_counter = rhs.arg_counter;
+    return *this;
+  }
+
+  template <class T> LIBC_INLINE T next_var() {
+    arg_counter = packed ? arg_counter + sizeof(T)
+                         : align_up(arg_counter, alignof(T)) + sizeof(T);
+    return T(arg_counter);
+  }
+
+  size_t read_count() const { return arg_counter; }
+};
+
+// Used for the GPU implementation of `printf`. This models a variadic list as a
+// simple array of pointers that are built manually by the implementation.
+template <bool packed> class StructArgList {
+  void *ptr;
+  void *end;
+
+public:
+  LIBC_INLINE StructArgList(void *ptr, size_t size)
+      : ptr(ptr), end(reinterpret_cast<unsigned char *>(ptr) + size) {}
+  LIBC_INLINE StructArgList(const StructArgList &other) {
+    ptr = other.ptr;
+    end = other.end;
+  }
+  LIBC_INLINE StructArgList() = default;
+  LIBC_INLINE ~StructArgList() = default;
+
+  LIBC_INLINE StructArgList &operator=(const StructArgList &rhs) {
+    ptr = rhs.ptr;
+    return *this;
+  }
+
+  LIBC_INLINE void *get_ptr() const { return ptr; }
+
+  template <class T> LIBC_INLINE T next_var() {
+    if (!packed)
+      ptr = reinterpret_cast<void *>(
+          align_up(reinterpret_cast<uintptr_t>(ptr), alignof(T)));
+    if (ptr >= end)
+      return T(-1);
+
+    // Memcpy because pointer alignment may be illegal given a packed struct.
+    T val;
+    __builtin_memcpy(&val, ptr, sizeof(T));
+
+    ptr =
+        reinterpret_cast<void *>(reinterpret_cast<uintptr_t>(ptr) + sizeof(T));
+    return val;
+  }
+};
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_ARG_LIST_H
diff --git a/contrib/llvm-project/libc/src/__support/big_int.h b/contrib/llvm-project/libc/src/__support/big_int.h
new file mode 100644
index 000000000000..85db31d01399
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/big_int.h
@@ -0,0 +1,1391 @@
+//===-- A class to manipulate wide integers. --------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_BIG_INT_H
+#define LLVM_LIBC_SRC___SUPPORT_BIG_INT_H
+
+#include "src/__support/CPP/array.h"
+#include "src/__support/CPP/bit.h" // countl_zero
+#include "src/__support/CPP/limits.h"
+#include "src/__support/CPP/optional.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h"        // LIBC_UNLIKELY
+#include "src/__support/macros/properties/compiler.h" // LIBC_COMPILER_IS_CLANG
+#include "src/__support/macros/properties/types.h" // LIBC_TYPES_HAS_INT128, LIBC_TYPES_HAS_INT64
+#include "src/__support/math_extras.h" // add_with_carry, sub_with_borrow
+#include "src/__support/number_pair.h"
+
+#include <stddef.h> // For size_t
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace multiword {
+
+// A type trait mapping unsigned integers to their half-width unsigned
+// counterparts.
+template <typename T> struct half_width;
+template <> struct half_width<uint16_t> : cpp::type_identity<uint8_t> {};
+template <> struct half_width<uint32_t> : cpp::type_identity<uint16_t> {};
+#ifdef LIBC_TYPES_HAS_INT64
+template <> struct half_width<uint64_t> : cpp::type_identity<uint32_t> {};
+#ifdef LIBC_TYPES_HAS_INT128
+template <> struct half_width<__uint128_t> : cpp::type_identity<uint64_t> {};
+#endif // LIBC_TYPES_HAS_INT128
+#endif // LIBC_TYPES_HAS_INT64
+template <typename T> using half_width_t = typename half_width<T>::type;
+
+// An array of two elements that can be used in multiword operations.
+template <typename T> struct DoubleWide final : cpp::array<T, 2> {
+  using UP = cpp::array<T, 2>;
+  using UP::UP;
+  LIBC_INLINE constexpr DoubleWide(T lo, T hi) : UP({lo, hi}) {}
+};
+
+// Converts an unsigned value into a DoubleWide<half_width_t<T>>.
+template <typename T> LIBC_INLINE constexpr auto split(T value) {
+  static_assert(cpp::is_unsigned_v<T>);
+  using half_type = half_width_t<T>;
+  return DoubleWide<half_type>(
+      half_type(value),
+      half_type(value >> cpp::numeric_limits<half_type>::digits));
+}
+
+// The low part of a DoubleWide value.
+template <typename T> LIBC_INLINE constexpr T lo(const DoubleWide<T> &value) {
+  return value[0];
+}
+// The high part of a DoubleWide value.
+template <typename T> LIBC_INLINE constexpr T hi(const DoubleWide<T> &value) {
+  return value[1];
+}
+// The low part of an unsigned value.
+template <typename T> LIBC_INLINE constexpr half_width_t<T> lo(T value) {
+  return lo(split(value));
+}
+// The high part of an unsigned value.
+template <typename T> LIBC_INLINE constexpr half_width_t<T> hi(T value) {
+  return hi(split(value));
+}
+
+// Returns 'a' times 'b' in a DoubleWide<word>. Cannot overflow by construction.
+template <typename word>
+LIBC_INLINE constexpr DoubleWide<word> mul2(word a, word b) {
+  if constexpr (cpp::is_same_v<word, uint8_t>) {
+    return split<uint16_t>(uint16_t(a) * uint16_t(b));
+  } else if constexpr (cpp::is_same_v<word, uint16_t>) {
+    return split<uint32_t>(uint32_t(a) * uint32_t(b));
+  }
+#ifdef LIBC_TYPES_HAS_INT64
+  else if constexpr (cpp::is_same_v<word, uint32_t>) {
+    return split<uint64_t>(uint64_t(a) * uint64_t(b));
+  }
+#endif
+#ifdef LIBC_TYPES_HAS_INT128
+  else if constexpr (cpp::is_same_v<word, uint64_t>) {
+    return split<__uint128_t>(__uint128_t(a) * __uint128_t(b));
+  }
+#endif
+  else {
+    using half_word = half_width_t<word>;
+    const auto shiftl = [](word value) -> word {
+      return value << cpp::numeric_limits<half_word>::digits;
+    };
+    const auto shiftr = [](word value) -> word {
+      return value >> cpp::numeric_limits<half_word>::digits;
+    };
+    // Here we do a one digit multiplication where 'a' and 'b' are of type
+    // word. We split 'a' and 'b' into half words and perform the classic long
+    // multiplication with 'a' and 'b' being two-digit numbers.
+
+    //    a      a_hi a_lo
+    //  x b => x b_hi b_lo
+    // ----    -----------
+    //    c         result
+    // We convert 'lo' and 'hi' from 'half_word' to 'word' so multiplication
+    // doesn't overflow.
+    const word a_lo = lo(a);
+    const word b_lo = lo(b);
+    const word a_hi = hi(a);
+    const word b_hi = hi(b);
+    const word step1 = b_lo * a_lo; // no overflow;
+    const word step2 = b_lo * a_hi; // no overflow;
+    const word step3 = b_hi * a_lo; // no overflow;
+    const word step4 = b_hi * a_hi; // no overflow;
+    word lo_digit = step1;
+    word hi_digit = step4;
+    const word no_carry = 0;
+    word carry;
+    word _; // unused carry variable.
+    lo_digit = add_with_carry<word>(lo_digit, shiftl(step2), no_carry, carry);
+    hi_digit = add_with_carry<word>(hi_digit, shiftr(step2), carry, _);
+    lo_digit = add_with_carry<word>(lo_digit, shiftl(step3), no_carry, carry);
+    hi_digit = add_with_carry<word>(hi_digit, shiftr(step3), carry, _);
+    return DoubleWide<word>(lo_digit, hi_digit);
+  }
+}
+
+// In-place 'dst op= rhs' with operation with carry propagation. Returns carry.
+template <typename Function, typename word, size_t N, size_t M>
+LIBC_INLINE constexpr word inplace_binop(Function op_with_carry,
+                                         cpp::array<word, N> &dst,
+                                         const cpp::array<word, M> &rhs) {
+  static_assert(N >= M);
+  word carry_out = 0;
+  for (size_t i = 0; i < N; ++i) {
+    const bool has_rhs_value = i < M;
+    const word rhs_value = has_rhs_value ? rhs[i] : 0;
+    const word carry_in = carry_out;
+    dst[i] = op_with_carry(dst[i], rhs_value, carry_in, carry_out);
+    // stop early when rhs is over and no carry is to be propagated.
+    if (!has_rhs_value && carry_out == 0)
+      break;
+  }
+  return carry_out;
+}
+
+// In-place addition. Returns carry.
+template <typename word, size_t N, size_t M>
+LIBC_INLINE constexpr word add_with_carry(cpp::array<word, N> &dst,
+                                          const cpp::array<word, M> &rhs) {
+  return inplace_binop(LIBC_NAMESPACE::add_with_carry<word>, dst, rhs);
+}
+
+// In-place subtraction. Returns borrow.
+template <typename word, size_t N, size_t M>
+LIBC_INLINE constexpr word sub_with_borrow(cpp::array<word, N> &dst,
+                                           const cpp::array<word, M> &rhs) {
+  return inplace_binop(LIBC_NAMESPACE::sub_with_borrow<word>, dst, rhs);
+}
+
+// In-place multiply-add. Returns carry.
+// i.e., 'dst += b * c'
+template <typename word, size_t N>
+LIBC_INLINE constexpr word mul_add_with_carry(cpp::array<word, N> &dst, word b,
+                                              word c) {
+  return add_with_carry(dst, mul2(b, c));
+}
+
+// An array of two elements serving as an accumulator during multiword
+// computations.
+template <typename T> struct Accumulator final : cpp::array<T, 2> {
+  using UP = cpp::array<T, 2>;
+  LIBC_INLINE constexpr Accumulator() : UP({0, 0}) {}
+  LIBC_INLINE constexpr T advance(T carry_in) {
+    auto result = UP::front();
+    UP::front() = UP::back();
+    UP::back() = carry_in;
+    return result;
+  }
+  LIBC_INLINE constexpr T sum() const { return UP::front(); }
+  LIBC_INLINE constexpr T carry() const { return UP::back(); }
+};
+
+// In-place multiplication by a single word. Returns carry.
+template <typename word, size_t N>
+LIBC_INLINE constexpr word scalar_multiply_with_carry(cpp::array<word, N> &dst,
+                                                      word x) {
+  Accumulator<word> acc;
+  for (auto &val : dst) {
+    const word carry = mul_add_with_carry(acc, val, x);
+    val = acc.advance(carry);
+  }
+  return acc.carry();
+}
+
+// Multiplication of 'lhs' by 'rhs' into 'dst'. Returns carry.
+// This function is safe to use for signed numbers.
+// https://stackoverflow.com/a/20793834
+// https://pages.cs.wisc.edu/%7Emarkhill/cs354/Fall2008/beyond354/int.mult.html
+template <typename word, size_t O, size_t M, size_t N>
+LIBC_INLINE constexpr word multiply_with_carry(cpp::array<word, O> &dst,
+                                               const cpp::array<word, M> &lhs,
+                                               const cpp::array<word, N> &rhs) {
+  static_assert(O >= M + N);
+  Accumulator<word> acc;
+  for (size_t i = 0; i < O; ++i) {
+    const size_t lower_idx = i < N ? 0 : i - N + 1;
+    const size_t upper_idx = i < M ? i : M - 1;
+    word carry = 0;
+    for (size_t j = lower_idx; j <= upper_idx; ++j)
+      carry += mul_add_with_carry(acc, lhs[j], rhs[i - j]);
+    dst[i] = acc.advance(carry);
+  }
+  return acc.carry();
+}
+
+template <typename word, size_t N>
+LIBC_INLINE constexpr void quick_mul_hi(cpp::array<word, N> &dst,
+                                        const cpp::array<word, N> &lhs,
+                                        const cpp::array<word, N> &rhs) {
+  Accumulator<word> acc;
+  word carry = 0;
+  // First round of accumulation for those at N - 1 in the full product.
+  for (size_t i = 0; i < N; ++i)
+    carry += mul_add_with_carry(acc, lhs[i], rhs[N - 1 - i]);
+  for (size_t i = N; i < 2 * N - 1; ++i) {
+    acc.advance(carry);
+    carry = 0;
+    for (size_t j = i - N + 1; j < N; ++j)
+      carry += mul_add_with_carry(acc, lhs[j], rhs[i - j]);
+    dst[i - N] = acc.sum();
+  }
+  dst.back() = acc.carry();
+}
+
+template <typename word, size_t N>
+LIBC_INLINE constexpr bool is_negative(const cpp::array<word, N> &array) {
+  using signed_word = cpp::make_signed_t<word>;
+  return cpp::bit_cast<signed_word>(array.back()) < 0;
+}
+
+// An enum for the shift function below.
+enum Direction { LEFT, RIGHT };
+
+// A bitwise shift on an array of elements.
+// 'offset' must be less than TOTAL_BITS (i.e., sizeof(word) * CHAR_BIT * N)
+// otherwise the behavior is undefined.
+template <Direction direction, bool is_signed, typename word, size_t N>
+LIBC_INLINE constexpr cpp::array<word, N> shift(cpp::array<word, N> array,
+                                                size_t offset) {
+  static_assert(direction == LEFT || direction == RIGHT);
+  constexpr size_t WORD_BITS = cpp::numeric_limits<word>::digits;
+#ifdef LIBC_TYPES_HAS_INT128
+  constexpr size_t TOTAL_BITS = N * WORD_BITS;
+  if constexpr (TOTAL_BITS == 128) {
+    using type = cpp::conditional_t<is_signed, __int128_t, __uint128_t>;
+    auto tmp = cpp::bit_cast<type>(array);
+    if constexpr (direction == LEFT)
+      tmp <<= offset;
+    else
+      tmp >>= offset;
+    return cpp::bit_cast<cpp::array<word, N>>(tmp);
+  }
+#endif
+  if (LIBC_UNLIKELY(offset == 0))
+    return array;
+  const bool is_neg = is_signed && is_negative(array);
+  constexpr auto at = [](size_t index) -> int {
+    // reverse iteration when direction == LEFT.
+    if constexpr (direction == LEFT)
+      return int(N) - int(index) - 1;
+    return int(index);
+  };
+  const auto safe_get_at = [&](size_t index) -> word {
+    // return appropriate value when accessing out of bound elements.
+    const int i = at(index);
+    if (i < 0)
+      return 0;
+    if (i >= int(N))
+      return is_neg ? cpp::numeric_limits<word>::max() : 0;
+    return array[static_cast<unsigned>(i)];
+  };
+  const size_t index_offset = offset / WORD_BITS;
+  const size_t bit_offset = offset % WORD_BITS;
+#ifdef LIBC_COMPILER_IS_CLANG
+  __builtin_assume(index_offset < N);
+#endif
+  cpp::array<word, N> out = {};
+  for (size_t index = 0; index < N; ++index) {
+    const word part1 = safe_get_at(index + index_offset);
+    const word part2 = safe_get_at(index + index_offset + 1);
+    word &dst = out[static_cast<unsigned>(at(index))];
+    if (bit_offset == 0)
+      dst = part1; // no crosstalk between parts.
+    else if constexpr (direction == LEFT)
+      dst = static_cast<word>((part1 << bit_offset) |
+                              (part2 >> (WORD_BITS - bit_offset)));
+    else
+      dst = static_cast<word>((part1 >> bit_offset) |
+                              (part2 << (WORD_BITS - bit_offset)));
+  }
+  return out;
+}
+
+#define DECLARE_COUNTBIT(NAME, INDEX_EXPR)                                     \
+  template <typename word, size_t N>                                           \
+  LIBC_INLINE constexpr int NAME(const cpp::array<word, N> &val) {             \
+    int bit_count = 0;                                                         \
+    for (size_t i = 0; i < N; ++i) {                                           \
+      const int word_count = cpp::NAME<word>(val[INDEX_EXPR]);                 \
+      bit_count += word_count;                                                 \
+      if (word_count != cpp::numeric_limits<word>::digits)                     \
+        break;                                                                 \
+    }                                                                          \
+    return bit_count;                                                          \
+  }
+
+DECLARE_COUNTBIT(countr_zero, i)         // iterating forward
+DECLARE_COUNTBIT(countr_one, i)          // iterating forward
+DECLARE_COUNTBIT(countl_zero, N - i - 1) // iterating backward
+DECLARE_COUNTBIT(countl_one, N - i - 1)  // iterating backward
+
+} // namespace multiword
+
+template <size_t Bits, bool Signed, typename WordType = uint64_t>
+struct BigInt {
+private:
+  static_assert(cpp::is_integral_v<WordType> && cpp::is_unsigned_v<WordType>,
+                "WordType must be unsigned integer.");
+
+  struct Division {
+    BigInt quotient;
+    BigInt remainder;
+  };
+
+public:
+  using word_type = WordType;
+  using unsigned_type = BigInt<Bits, false, word_type>;
+  using signed_type = BigInt<Bits, true, word_type>;
+
+  LIBC_INLINE_VAR static constexpr bool SIGNED = Signed;
+  LIBC_INLINE_VAR static constexpr size_t BITS = Bits;
+  LIBC_INLINE_VAR
+  static constexpr size_t WORD_SIZE = sizeof(WordType) * CHAR_BIT;
+
+  static_assert(Bits > 0 && Bits % WORD_SIZE == 0,
+                "Number of bits in BigInt should be a multiple of WORD_SIZE.");
+
+  LIBC_INLINE_VAR static constexpr size_t WORD_COUNT = Bits / WORD_SIZE;
+
+  cpp::array<WordType, WORD_COUNT> val{}; // zero initialized.
+
+  LIBC_INLINE constexpr BigInt() = default;
+
+  LIBC_INLINE constexpr BigInt(const BigInt &other) = default;
+
+  template <size_t OtherBits, bool OtherSigned, typename OtherWordType>
+  LIBC_INLINE constexpr BigInt(
+      const BigInt<OtherBits, OtherSigned, OtherWordType> &other) {
+    using BigIntOther = BigInt<OtherBits, OtherSigned, OtherWordType>;
+    const bool should_sign_extend = Signed && other.is_neg();
+
+    static_assert(!(Bits == OtherBits && WORD_SIZE != BigIntOther::WORD_SIZE) &&
+                  "This is currently untested for casting between bigints with "
+                  "the same bit width but different word sizes.");
+
+    if constexpr (BigIntOther::WORD_SIZE < WORD_SIZE) {
+      // OtherWordType is smaller
+      constexpr size_t WORD_SIZE_RATIO = WORD_SIZE / BigIntOther::WORD_SIZE;
+      static_assert(
+          (WORD_SIZE % BigIntOther::WORD_SIZE) == 0 &&
+          "Word types must be multiples of each other for correct conversion.");
+      if constexpr (OtherBits >= Bits) { // truncate
+        // for each big word
+        for (size_t i = 0; i < WORD_COUNT; ++i) {
+          WordType cur_word = 0;
+          // combine WORD_SIZE_RATIO small words into a big word
+          for (size_t j = 0; j < WORD_SIZE_RATIO; ++j)
+            cur_word |= static_cast<WordType>(other[(i * WORD_SIZE_RATIO) + j])
+                        << (BigIntOther::WORD_SIZE * j);
+
+          val[i] = cur_word;
+        }
+      } else { // zero or sign extend
+        size_t i = 0;
+        WordType cur_word = 0;
+        // for each small word
+        for (; i < BigIntOther::WORD_COUNT; ++i) {
+          // combine WORD_SIZE_RATIO small words into a big word
+          cur_word |= static_cast<WordType>(other[i])
+                      << (BigIntOther::WORD_SIZE * (i % WORD_SIZE_RATIO));
+          // if we've completed a big word, copy it into place and reset
+          if ((i % WORD_SIZE_RATIO) == WORD_SIZE_RATIO - 1) {
+            val[i / WORD_SIZE_RATIO] = cur_word;
+            cur_word = 0;
+          }
+        }
+        // Pretend there are extra words of the correct sign extension as needed
+
+        const WordType extension_bits =
+            should_sign_extend ? cpp::numeric_limits<WordType>::max()
+                               : cpp::numeric_limits<WordType>::min();
+        if ((i % WORD_SIZE_RATIO) != 0) {
+          cur_word |= static_cast<WordType>(extension_bits)
+                      << (BigIntOther::WORD_SIZE * (i % WORD_SIZE_RATIO));
+        }
+        // Copy the last word into place.
+        val[(i / WORD_SIZE_RATIO)] = cur_word;
+        extend((i / WORD_SIZE_RATIO) + 1, should_sign_extend);
+      }
+    } else if constexpr (BigIntOther::WORD_SIZE == WORD_SIZE) {
+      if constexpr (OtherBits >= Bits) { // truncate
+        for (size_t i = 0; i < WORD_COUNT; ++i)
+          val[i] = other[i];
+      } else { // zero or sign extend
+        size_t i = 0;
+        for (; i < BigIntOther::WORD_COUNT; ++i)
+          val[i] = other[i];
+        extend(i, should_sign_extend);
+      }
+    } else {
+      // OtherWordType is bigger.
+      constexpr size_t WORD_SIZE_RATIO = BigIntOther::WORD_SIZE / WORD_SIZE;
+      static_assert(
+          (BigIntOther::WORD_SIZE % WORD_SIZE) == 0 &&
+          "Word types must be multiples of each other for correct conversion.");
+      if constexpr (OtherBits >= Bits) { // truncate
+        // for each small word
+        for (size_t i = 0; i < WORD_COUNT; ++i) {
+          // split each big word into WORD_SIZE_RATIO small words
+          val[i] = static_cast<WordType>(other[i / WORD_SIZE_RATIO] >>
+                                         ((i % WORD_SIZE_RATIO) * WORD_SIZE));
+        }
+      } else { // zero or sign extend
+        size_t i = 0;
+        // for each big word
+        for (; i < BigIntOther::WORD_COUNT; ++i) {
+          // split each big word into WORD_SIZE_RATIO small words
+          for (size_t j = 0; j < WORD_SIZE_RATIO; ++j)
+            val[(i * WORD_SIZE_RATIO) + j] =
+                static_cast<WordType>(other[i] >> (j * WORD_SIZE));
+        }
+        extend(i * WORD_SIZE_RATIO, should_sign_extend);
+      }
+    }
+  }
+
+  // Construct a BigInt from a C array.
+  template <size_t N> LIBC_INLINE constexpr BigInt(const WordType (&nums)[N]) {
+    static_assert(N == WORD_COUNT);
+    for (size_t i = 0; i < WORD_COUNT; ++i)
+      val[i] = nums[i];
+  }
+
+  LIBC_INLINE constexpr explicit BigInt(
+      const cpp::array<WordType, WORD_COUNT> &words) {
+    val = words;
+  }
+
+  // Initialize the first word to |v| and the rest to 0.
+  template <typename T, typename = cpp::enable_if_t<cpp::is_integral_v<T>>>
+  LIBC_INLINE constexpr BigInt(T v) {
+    constexpr size_t T_SIZE = sizeof(T) * CHAR_BIT;
+    const bool is_neg = v < 0;
+    for (size_t i = 0; i < WORD_COUNT; ++i) {
+      if (v == 0) {
+        extend(i, is_neg);
+        return;
+      }
+      val[i] = static_cast<WordType>(v);
+      if constexpr (T_SIZE > WORD_SIZE)
+        v >>= WORD_SIZE;
+      else
+        v = 0;
+    }
+  }
+  LIBC_INLINE constexpr BigInt &operator=(const BigInt &other) = default;
+
+  // constants
+  LIBC_INLINE static constexpr BigInt zero() { return BigInt(); }
+  LIBC_INLINE static constexpr BigInt one() { return BigInt(1); }
+  LIBC_INLINE static constexpr BigInt all_ones() { return ~zero(); }
+  LIBC_INLINE static constexpr BigInt min() {
+    BigInt out;
+    if constexpr (SIGNED)
+      out.set_msb();
+    return out;
+  }
+  LIBC_INLINE static constexpr BigInt max() {
+    BigInt out = all_ones();
+    if constexpr (SIGNED)
+      out.clear_msb();
+    return out;
+  }
+
+  // TODO: Reuse the Sign type.
+  LIBC_INLINE constexpr bool is_neg() const { return SIGNED && get_msb(); }
+
+  template <size_t OtherBits, bool OtherSigned, typename OtherWordType>
+  LIBC_INLINE constexpr explicit
+  operator BigInt<OtherBits, OtherSigned, OtherWordType>() const {
+    return BigInt<OtherBits, OtherSigned, OtherWordType>(this);
+  }
+
+  template <typename T> LIBC_INLINE constexpr explicit operator T() const {
+    return to<T>();
+  }
+
+  template <typename T>
+  LIBC_INLINE constexpr cpp::enable_if_t<
+      cpp::is_integral_v<T> && !cpp::is_same_v<T, bool>, T>
+  to() const {
+    constexpr size_t T_SIZE = sizeof(T) * CHAR_BIT;
+    T lo = static_cast<T>(val[0]);
+    if constexpr (T_SIZE <= WORD_SIZE)
+      return lo;
+    constexpr size_t MAX_COUNT =
+        T_SIZE > Bits ? WORD_COUNT : T_SIZE / WORD_SIZE;
+    for (size_t i = 1; i < MAX_COUNT; ++i)
+      lo += static_cast<T>(static_cast<T>(val[i]) << (WORD_SIZE * i));
+    if constexpr (Signed && (T_SIZE > Bits)) {
+      // Extend sign for negative numbers.
+      constexpr T MASK = (~T(0) << Bits);
+      if (is_neg())
+        lo |= MASK;
+    }
+    return lo;
+  }
+
+  LIBC_INLINE constexpr explicit operator bool() const { return !is_zero(); }
+
+  LIBC_INLINE constexpr bool is_zero() const {
+    for (auto part : val)
+      if (part != 0)
+        return false;
+    return true;
+  }
+
+  // Add 'rhs' to this number and store the result in this number.
+  // Returns the carry value produced by the addition operation.
+  LIBC_INLINE constexpr WordType add_overflow(const BigInt &rhs) {
+    return multiword::add_with_carry(val, rhs.val);
+  }
+
+  LIBC_INLINE constexpr BigInt operator+(const BigInt &other) const {
+    BigInt result = *this;
+    result.add_overflow(other);
+    return result;
+  }
+
+  // This will only apply when initializing a variable from constant values, so
+  // it will always use the constexpr version of add_with_carry.
+  LIBC_INLINE constexpr BigInt operator+(BigInt &&other) const {
+    // We use addition commutativity to reuse 'other' and prevent allocation.
+    other.add_overflow(*this); // Returned carry value is ignored.
+    return other;
+  }
+
+  LIBC_INLINE constexpr BigInt &operator+=(const BigInt &other) {
+    add_overflow(other); // Returned carry value is ignored.
+    return *this;
+  }
+
+  // Subtract 'rhs' to this number and store the result in this number.
+  // Returns the carry value produced by the subtraction operation.
+  LIBC_INLINE constexpr WordType sub_overflow(const BigInt &rhs) {
+    return multiword::sub_with_borrow(val, rhs.val);
+  }
+
+  LIBC_INLINE constexpr BigInt operator-(const BigInt &other) const {
+    BigInt result = *this;
+    result.sub_overflow(other); // Returned carry value is ignored.
+    return result;
+  }
+
+  LIBC_INLINE constexpr BigInt operator-(BigInt &&other) const {
+    BigInt result = *this;
+    result.sub_overflow(other); // Returned carry value is ignored.
+    return result;
+  }
+
+  LIBC_INLINE constexpr BigInt &operator-=(const BigInt &other) {
+    // TODO(lntue): Set overflow flag / errno when carry is true.
+    sub_overflow(other); // Returned carry value is ignored.
+    return *this;
+  }
+
+  // Multiply this number with x and store the result in this number.
+  LIBC_INLINE constexpr WordType mul(WordType x) {
+    return multiword::scalar_multiply_with_carry(val, x);
+  }
+
+  // Return the full product.
+  template <size_t OtherBits>
+  LIBC_INLINE constexpr auto
+  ful_mul(const BigInt<OtherBits, Signed, WordType> &other) const {
+    BigInt<Bits + OtherBits, Signed, WordType> result;
+    multiword::multiply_with_carry(result.val, val, other.val);
+    return result;
+  }
+
+  LIBC_INLINE constexpr BigInt operator*(const BigInt &other) const {
+    // Perform full mul and truncate.
+    return BigInt(ful_mul(other));
+  }
+
+  // Fast hi part of the full product.  The normal product `operator*` returns
+  // `Bits` least significant bits of the full product, while this function will
+  // approximate `Bits` most significant bits of the full product with errors
+  // bounded by:
+  //   0 <= (a.full_mul(b) >> Bits) - a.quick_mul_hi(b)) <= WORD_COUNT - 1.
+  //
+  // An example usage of this is to quickly (but less accurately) compute the
+  // product of (normalized) mantissas of floating point numbers:
+  //   (mant_1, mant_2) -> quick_mul_hi -> normalize leading bit
+  // is much more efficient than:
+  //   (mant_1, mant_2) -> ful_mul -> normalize leading bit
+  //                    -> convert back to same Bits width by shifting/rounding,
+  // especially for higher precisions.
+  //
+  // Performance summary:
+  //   Number of 64-bit x 64-bit -> 128-bit multiplications performed.
+  //   Bits  WORD_COUNT  ful_mul  quick_mul_hi  Error bound
+  //    128      2         4           3            1
+  //    196      3         9           6            2
+  //    256      4        16          10            3
+  //    512      8        64          36            7
+  LIBC_INLINE constexpr BigInt quick_mul_hi(const BigInt &other) const {
+    BigInt result;
+    multiword::quick_mul_hi(result.val, val, other.val);
+    return result;
+  }
+
+  // BigInt(x).pow_n(n) computes x ^ n.
+  // Note 0 ^ 0 == 1.
+  LIBC_INLINE constexpr void pow_n(uint64_t power) {
+    static_assert(!Signed);
+    BigInt result = one();
+    BigInt cur_power = *this;
+    while (power > 0) {
+      if ((power % 2) > 0)
+        result *= cur_power;
+      power >>= 1;
+      cur_power *= cur_power;
+    }
+    *this = result;
+  }
+
+  // Performs inplace signed / unsigned division. Returns remainder if not
+  // dividing by zero.
+  // For signed numbers it behaves like C++ signed integer division.
+  // That is by truncating the fractionnal part
+  // https://stackoverflow.com/a/3602857
+  LIBC_INLINE constexpr cpp::optional<BigInt> div(const BigInt &divider) {
+    if (LIBC_UNLIKELY(divider.is_zero()))
+      return cpp::nullopt;
+    if (LIBC_UNLIKELY(divider == BigInt::one()))
+      return BigInt::zero();
+    Division result;
+    if constexpr (SIGNED)
+      result = divide_signed(*this, divider);
+    else
+      result = divide_unsigned(*this, divider);
+    *this = result.quotient;
+    return result.remainder;
+  }
+
+  // Efficiently perform BigInt / (x * 2^e), where x is a half-word-size
+  // unsigned integer, and return the remainder. The main idea is as follow:
+  //   Let q = y / (x * 2^e) be the quotient, and
+  //       r = y % (x * 2^e) be the remainder.
+  //   First, notice that:
+  //     r % (2^e) = y % (2^e),
+  // so we just need to focus on all the bits of y that is >= 2^e.
+  //   To speed up the shift-and-add steps, we only use x as the divisor, and
+  // performing 32-bit shiftings instead of bit-by-bit shiftings.
+  //   Since the remainder of each division step < x < 2^(WORD_SIZE / 2), the
+  // computation of each step is now properly contained within WordType.
+  //   And finally we perform some extra alignment steps for the remaining bits.
+  LIBC_INLINE constexpr cpp::optional<BigInt>
+  div_uint_half_times_pow_2(multiword::half_width_t<WordType> x, size_t e) {
+    BigInt remainder;
+    if (x == 0)
+      return cpp::nullopt;
+    if (e >= Bits) {
+      remainder = *this;
+      *this = BigInt<Bits, false, WordType>();
+      return remainder;
+    }
+    BigInt quotient;
+    WordType x_word = static_cast<WordType>(x);
+    constexpr size_t LOG2_WORD_SIZE =
+        static_cast<size_t>(cpp::bit_width(WORD_SIZE) - 1);
+    constexpr size_t HALF_WORD_SIZE = WORD_SIZE >> 1;
+    constexpr WordType HALF_MASK = ((WordType(1) << HALF_WORD_SIZE) - 1);
+    // lower = smallest multiple of WORD_SIZE that is >= e.
+    size_t lower = ((e >> LOG2_WORD_SIZE) + ((e & (WORD_SIZE - 1)) != 0))
+                   << LOG2_WORD_SIZE;
+    // lower_pos is the index of the closest WORD_SIZE-bit chunk >= 2^e.
+    size_t lower_pos = lower / WORD_SIZE;
+    // Keep track of current remainder mod x * 2^(32*i)
+    WordType rem = 0;
+    // pos is the index of the current 64-bit chunk that we are processing.
+    size_t pos = WORD_COUNT;
+
+    // TODO: look into if constexpr(Bits > 256) skip leading zeroes.
+
+    for (size_t q_pos = WORD_COUNT - lower_pos; q_pos > 0; --q_pos) {
+      // q_pos is 1 + the index of the current WORD_SIZE-bit chunk of the
+      // quotient being processed. Performing the division / modulus with
+      // divisor:
+      //   x * 2^(WORD_SIZE*q_pos - WORD_SIZE/2),
+      // i.e. using the upper (WORD_SIZE/2)-bit of the current WORD_SIZE-bit
+      // chunk.
+      rem <<= HALF_WORD_SIZE;
+      rem += val[--pos] >> HALF_WORD_SIZE;
+      WordType q_tmp = rem / x_word;
+      rem %= x_word;
+
+      // Performing the division / modulus with divisor:
+      //   x * 2^(WORD_SIZE*(q_pos - 1)),
+      // i.e. using the lower (WORD_SIZE/2)-bit of the current WORD_SIZE-bit
+      // chunk.
+      rem <<= HALF_WORD_SIZE;
+      rem += val[pos] & HALF_MASK;
+      quotient.val[q_pos - 1] = (q_tmp << HALF_WORD_SIZE) + rem / x_word;
+      rem %= x_word;
+    }
+
+    // So far, what we have is:
+    //   quotient = y / (x * 2^lower), and
+    //        rem = (y % (x * 2^lower)) / 2^lower.
+    // If (lower > e), we will need to perform an extra adjustment of the
+    // quotient and remainder, namely:
+    //   y / (x * 2^e) = [ y / (x * 2^lower) ] * 2^(lower - e) +
+    //                   + (rem * 2^(lower - e)) / x
+    //   (y % (x * 2^e)) / 2^e = (rem * 2^(lower - e)) % x
+    size_t last_shift = lower - e;
+
+    if (last_shift > 0) {
+      // quotient * 2^(lower - e)
+      quotient <<= last_shift;
+      WordType q_tmp = 0;
+      WordType d = val[--pos];
+      if (last_shift >= HALF_WORD_SIZE) {
+        // The shifting (rem * 2^(lower - e)) might overflow WordTyoe, so we
+        // perform a HALF_WORD_SIZE-bit shift first.
+        rem <<= HALF_WORD_SIZE;
+        rem += d >> HALF_WORD_SIZE;
+        d &= HALF_MASK;
+        q_tmp = rem / x_word;
+        rem %= x_word;
+        last_shift -= HALF_WORD_SIZE;
+      } else {
+        // Only use the upper HALF_WORD_SIZE-bit of the current WORD_SIZE-bit
+        // chunk.
+        d >>= HALF_WORD_SIZE;
+      }
+
+      if (last_shift > 0) {
+        rem <<= HALF_WORD_SIZE;
+        rem += d;
+        q_tmp <<= last_shift;
+        x_word <<= HALF_WORD_SIZE - last_shift;
+        q_tmp += rem / x_word;
+        rem %= x_word;
+      }
+
+      quotient.val[0] += q_tmp;
+
+      if (lower - e <= HALF_WORD_SIZE) {
+        // The remainder rem * 2^(lower - e) might overflow to the higher
+        // WORD_SIZE-bit chunk.
+        if (pos < WORD_COUNT - 1) {
+          remainder[pos + 1] = rem >> HALF_WORD_SIZE;
+        }
+        remainder[pos] = (rem << HALF_WORD_SIZE) + (val[pos] & HALF_MASK);
+      } else {
+        remainder[pos] = rem;
+      }
+
+    } else {
+      remainder[pos] = rem;
+    }
+
+    // Set the remaining lower bits of the remainder.
+    for (; pos > 0; --pos) {
+      remainder[pos - 1] = val[pos - 1];
+    }
+
+    *this = quotient;
+    return remainder;
+  }
+
+  LIBC_INLINE constexpr BigInt operator/(const BigInt &other) const {
+    BigInt result(*this);
+    result.div(other);
+    return result;
+  }
+
+  LIBC_INLINE constexpr BigInt &operator/=(const BigInt &other) {
+    div(other);
+    return *this;
+  }
+
+  LIBC_INLINE constexpr BigInt operator%(const BigInt &other) const {
+    BigInt result(*this);
+    return *result.div(other);
+  }
+
+  LIBC_INLINE constexpr BigInt operator%=(const BigInt &other) {
+    *this = *this % other;
+    return *this;
+  }
+
+  LIBC_INLINE constexpr BigInt &operator*=(const BigInt &other) {
+    *this = *this * other;
+    return *this;
+  }
+
+  LIBC_INLINE constexpr BigInt &operator<<=(size_t s) {
+    val = multiword::shift<multiword::LEFT, SIGNED>(val, s);
+    return *this;
+  }
+
+  LIBC_INLINE constexpr BigInt operator<<(size_t s) const {
+    return BigInt(multiword::shift<multiword::LEFT, SIGNED>(val, s));
+  }
+
+  LIBC_INLINE constexpr BigInt &operator>>=(size_t s) {
+    val = multiword::shift<multiword::RIGHT, SIGNED>(val, s);
+    return *this;
+  }
+
+  LIBC_INLINE constexpr BigInt operator>>(size_t s) const {
+    return BigInt(multiword::shift<multiword::RIGHT, SIGNED>(val, s));
+  }
+
+#define DEFINE_BINOP(OP)                                                       \
+  LIBC_INLINE friend constexpr BigInt operator OP(const BigInt &lhs,           \
+                                                  const BigInt &rhs) {         \
+    BigInt result;                                                             \
+    for (size_t i = 0; i < WORD_COUNT; ++i)                                    \
+      result[i] = lhs[i] OP rhs[i];                                            \
+    return result;                                                             \
+  }                                                                            \
+  LIBC_INLINE friend constexpr BigInt operator OP##=(BigInt &lhs,              \
+                                                     const BigInt &rhs) {      \
+    for (size_t i = 0; i < WORD_COUNT; ++i)                                    \
+      lhs[i] OP## = rhs[i];                                                    \
+    return lhs;                                                                \
+  }
+
+  DEFINE_BINOP(&) // & and &=
+  DEFINE_BINOP(|) // | and |=
+  DEFINE_BINOP(^) // ^ and ^=
+#undef DEFINE_BINOP
+
+  LIBC_INLINE constexpr BigInt operator~() const {
+    BigInt result;
+    for (size_t i = 0; i < WORD_COUNT; ++i)
+      result[i] = static_cast<WordType>(~val[i]);
+    return result;
+  }
+
+  LIBC_INLINE constexpr BigInt operator-() const {
+    BigInt result(*this);
+    result.negate();
+    return result;
+  }
+
+  LIBC_INLINE friend constexpr bool operator==(const BigInt &lhs,
+                                               const BigInt &rhs) {
+    for (size_t i = 0; i < WORD_COUNT; ++i)
+      if (lhs.val[i] != rhs.val[i])
+        return false;
+    return true;
+  }
+
+  LIBC_INLINE friend constexpr bool operator!=(const BigInt &lhs,
+                                               const BigInt &rhs) {
+    return !(lhs == rhs);
+  }
+
+  LIBC_INLINE friend constexpr bool operator>(const BigInt &lhs,
+                                              const BigInt &rhs) {
+    return cmp(lhs, rhs) > 0;
+  }
+  LIBC_INLINE friend constexpr bool operator>=(const BigInt &lhs,
+                                               const BigInt &rhs) {
+    return cmp(lhs, rhs) >= 0;
+  }
+  LIBC_INLINE friend constexpr bool operator<(const BigInt &lhs,
+                                              const BigInt &rhs) {
+    return cmp(lhs, rhs) < 0;
+  }
+  LIBC_INLINE friend constexpr bool operator<=(const BigInt &lhs,
+                                               const BigInt &rhs) {
+    return cmp(lhs, rhs) <= 0;
+  }
+
+  LIBC_INLINE constexpr BigInt &operator++() {
+    increment();
+    return *this;
+  }
+
+  LIBC_INLINE constexpr BigInt operator++(int) {
+    BigInt oldval(*this);
+    increment();
+    return oldval;
+  }
+
+  LIBC_INLINE constexpr BigInt &operator--() {
+    decrement();
+    return *this;
+  }
+
+  LIBC_INLINE constexpr BigInt operator--(int) {
+    BigInt oldval(*this);
+    decrement();
+    return oldval;
+  }
+
+  // Return the i-th word of the number.
+  LIBC_INLINE constexpr const WordType &operator[](size_t i) const {
+    return val[i];
+  }
+
+  // Return the i-th word of the number.
+  LIBC_INLINE constexpr WordType &operator[](size_t i) { return val[i]; }
+
+  // Return the i-th bit of the number.
+  LIBC_INLINE constexpr bool get_bit(size_t i) const {
+    const size_t word_index = i / WORD_SIZE;
+    return 1 & (val[word_index] >> (i % WORD_SIZE));
+  }
+
+  // Set the i-th bit of the number.
+  LIBC_INLINE constexpr void set_bit(size_t i) {
+    const size_t word_index = i / WORD_SIZE;
+    val[word_index] |= WordType(1) << (i % WORD_SIZE);
+  }
+
+private:
+  LIBC_INLINE friend constexpr int cmp(const BigInt &lhs, const BigInt &rhs) {
+    constexpr auto compare = [](WordType a, WordType b) {
+      return a == b ? 0 : a > b ? 1 : -1;
+    };
+    if constexpr (Signed) {
+      const bool lhs_is_neg = lhs.is_neg();
+      const bool rhs_is_neg = rhs.is_neg();
+      if (lhs_is_neg != rhs_is_neg)
+        return rhs_is_neg ? 1 : -1;
+    }
+    for (size_t i = WORD_COUNT; i-- > 0;)
+      if (auto cmp = compare(lhs[i], rhs[i]); cmp != 0)
+        return cmp;
+    return 0;
+  }
+
+  LIBC_INLINE constexpr void bitwise_not() {
+    for (auto &part : val)
+      part = static_cast<WordType>(~part);
+  }
+
+  LIBC_INLINE constexpr void negate() {
+    bitwise_not();
+    increment();
+  }
+
+  LIBC_INLINE constexpr void increment() {
+    multiword::add_with_carry(val, cpp::array<WordType, 1>{1});
+  }
+
+  LIBC_INLINE constexpr void decrement() {
+    multiword::sub_with_borrow(val, cpp::array<WordType, 1>{1});
+  }
+
+  LIBC_INLINE constexpr void extend(size_t index, bool is_neg) {
+    const WordType value = is_neg ? cpp::numeric_limits<WordType>::max()
+                                  : cpp::numeric_limits<WordType>::min();
+    for (size_t i = index; i < WORD_COUNT; ++i)
+      val[i] = value;
+  }
+
+  LIBC_INLINE constexpr bool get_msb() const {
+    return val.back() >> (WORD_SIZE - 1);
+  }
+
+  LIBC_INLINE constexpr void set_msb() {
+    val.back() |= mask_leading_ones<WordType, 1>();
+  }
+
+  LIBC_INLINE constexpr void clear_msb() {
+    val.back() &= mask_trailing_ones<WordType, WORD_SIZE - 1>();
+  }
+  LIBC_INLINE constexpr static Division divide_unsigned(const BigInt &dividend,
+                                                        const BigInt &divider) {
+    BigInt remainder = dividend;
+    BigInt quotient;
+    if (remainder >= divider) {
+      BigInt subtractor = divider;
+      int cur_bit = multiword::countl_zero(subtractor.val) -
+                    multiword::countl_zero(remainder.val);
+      subtractor <<= static_cast<size_t>(cur_bit);
+      for (; cur_bit >= 0 && remainder > 0; --cur_bit, subtractor >>= 1) {
+        if (remainder < subtractor)
+          continue;
+        remainder -= subtractor;
+        quotient.set_bit(static_cast<size_t>(cur_bit));
+      }
+    }
+    return Division{quotient, remainder};
+  }
+
+  LIBC_INLINE constexpr static Division divide_signed(const BigInt &dividend,
+                                                      const BigInt &divider) {
+    // Special case because it is not possible to negate the min value of a
+    // signed integer.
+    if (dividend == min() && divider == min())
+      return Division{one(), zero()};
+    // 1. Convert the dividend and divisor to unsigned representation.
+    unsigned_type udividend(dividend);
+    unsigned_type udivider(divider);
+    // 2. Negate the dividend if it's negative, and similarly for the divisor.
+    const bool dividend_is_neg = dividend.is_neg();
+    const bool divider_is_neg = divider.is_neg();
+    if (dividend_is_neg)
+      udividend.negate();
+    if (divider_is_neg)
+      udivider.negate();
+    // 3. Use unsigned multiword division algorithm.
+    const auto unsigned_result = divide_unsigned(udividend, udivider);
+    // 4. Convert the quotient and remainder to signed representation.
+    Division result;
+    result.quotient = signed_type(unsigned_result.quotient);
+    result.remainder = signed_type(unsigned_result.remainder);
+    // 5. Negate the quotient if the dividend and divisor had opposite signs.
+    if (dividend_is_neg != divider_is_neg)
+      result.quotient.negate();
+    // 6. Negate the remainder if the dividend was negative.
+    if (dividend_is_neg)
+      result.remainder.negate();
+    return result;
+  }
+
+  friend signed_type;
+  friend unsigned_type;
+};
+
+namespace internal {
+// We default BigInt's WordType to 'uint64_t' or 'uint32_t' depending on type
+// availability.
+template <size_t Bits>
+struct WordTypeSelector : cpp::type_identity<
+#ifdef LIBC_TYPES_HAS_INT64
+                              uint64_t
+#else
+                              uint32_t
+#endif // LIBC_TYPES_HAS_INT64
+                              > {
+};
+// Except if we request 16 or 32 bits explicitly.
+template <> struct WordTypeSelector<16> : cpp::type_identity<uint16_t> {};
+template <> struct WordTypeSelector<32> : cpp::type_identity<uint32_t> {};
+template <> struct WordTypeSelector<96> : cpp::type_identity<uint32_t> {};
+
+template <size_t Bits>
+using WordTypeSelectorT = typename WordTypeSelector<Bits>::type;
+} // namespace internal
+
+template <size_t Bits>
+using UInt = BigInt<Bits, false, internal::WordTypeSelectorT<Bits>>;
+
+template <size_t Bits>
+using Int = BigInt<Bits, true, internal::WordTypeSelectorT<Bits>>;
+
+// Provides limits of BigInt.
+template <size_t Bits, bool Signed, typename T>
+struct cpp::numeric_limits<BigInt<Bits, Signed, T>> {
+  LIBC_INLINE static constexpr BigInt<Bits, Signed, T> max() {
+    return BigInt<Bits, Signed, T>::max();
+  }
+  LIBC_INLINE static constexpr BigInt<Bits, Signed, T> min() {
+    return BigInt<Bits, Signed, T>::min();
+  }
+  // Meant to match std::numeric_limits interface.
+  // NOLINTNEXTLINE(readability-identifier-naming)
+  LIBC_INLINE_VAR static constexpr int digits = Bits - Signed;
+};
+
+// type traits to determine whether a T is a BigInt.
+template <typename T> struct is_big_int : cpp::false_type {};
+
+template <size_t Bits, bool Signed, typename T>
+struct is_big_int<BigInt<Bits, Signed, T>> : cpp::true_type {};
+
+template <class T>
+LIBC_INLINE_VAR constexpr bool is_big_int_v = is_big_int<T>::value;
+
+// extensions of type traits to include BigInt
+
+// is_integral_or_big_int
+template <typename T>
+struct is_integral_or_big_int
+    : cpp::bool_constant<(cpp::is_integral_v<T> || is_big_int_v<T>)> {};
+
+template <typename T>
+LIBC_INLINE_VAR constexpr bool is_integral_or_big_int_v =
+    is_integral_or_big_int<T>::value;
+
+// make_big_int_unsigned
+template <typename T> struct make_big_int_unsigned;
+
+template <size_t Bits, bool Signed, typename T>
+struct make_big_int_unsigned<BigInt<Bits, Signed, T>>
+    : cpp::type_identity<BigInt<Bits, false, T>> {};
+
+template <typename T>
+using make_big_int_unsigned_t = typename make_big_int_unsigned<T>::type;
+
+// make_big_int_signed
+template <typename T> struct make_big_int_signed;
+
+template <size_t Bits, bool Signed, typename T>
+struct make_big_int_signed<BigInt<Bits, Signed, T>>
+    : cpp::type_identity<BigInt<Bits, true, T>> {};
+
+template <typename T>
+using make_big_int_signed_t = typename make_big_int_signed<T>::type;
+
+// make_integral_or_big_int_unsigned
+template <typename T, class = void> struct make_integral_or_big_int_unsigned;
+
+template <typename T>
+struct make_integral_or_big_int_unsigned<
+    T, cpp::enable_if_t<cpp::is_integral_v<T>>> : cpp::make_unsigned<T> {};
+
+template <typename T>
+struct make_integral_or_big_int_unsigned<T, cpp::enable_if_t<is_big_int_v<T>>>
+    : make_big_int_unsigned<T> {};
+
+template <typename T>
+using make_integral_or_big_int_unsigned_t =
+    typename make_integral_or_big_int_unsigned<T>::type;
+
+// make_integral_or_big_int_signed
+template <typename T, class = void> struct make_integral_or_big_int_signed;
+
+template <typename T>
+struct make_integral_or_big_int_signed<T,
+                                       cpp::enable_if_t<cpp::is_integral_v<T>>>
+    : cpp::make_signed<T> {};
+
+template <typename T>
+struct make_integral_or_big_int_signed<T, cpp::enable_if_t<is_big_int_v<T>>>
+    : make_big_int_signed<T> {};
+
+template <typename T>
+using make_integral_or_big_int_signed_t =
+    typename make_integral_or_big_int_signed<T>::type;
+
+// is_unsigned_integral_or_big_int
+template <typename T>
+struct is_unsigned_integral_or_big_int
+    : cpp::bool_constant<
+          cpp::is_same_v<T, make_integral_or_big_int_unsigned_t<T>>> {};
+
+template <typename T>
+// Meant to look like <type_traits> helper variable templates.
+// NOLINTNEXTLINE(readability-identifier-naming)
+LIBC_INLINE_VAR constexpr bool is_unsigned_integral_or_big_int_v =
+    is_unsigned_integral_or_big_int<T>::value;
+
+namespace cpp {
+
+// Specialization of cpp::bit_cast ('bit.h') from T to BigInt.
+template <typename To, typename From>
+LIBC_INLINE constexpr cpp::enable_if_t<
+    (sizeof(To) == sizeof(From)) && cpp::is_trivially_copyable<To>::value &&
+        cpp::is_trivially_copyable<From>::value && is_big_int<To>::value,
+    To>
+bit_cast(const From &from) {
+  To out;
+  using Storage = decltype(out.val);
+  out.val = cpp::bit_cast<Storage>(from);
+  return out;
+}
+
+// Specialization of cpp::bit_cast ('bit.h') from BigInt to T.
+template <typename To, size_t Bits>
+LIBC_INLINE constexpr cpp::enable_if_t<
+    sizeof(To) == sizeof(UInt<Bits>) &&
+        cpp::is_trivially_constructible<To>::value &&
+        cpp::is_trivially_copyable<To>::value &&
+        cpp::is_trivially_copyable<UInt<Bits>>::value,
+    To>
+bit_cast(const UInt<Bits> &from) {
+  return cpp::bit_cast<To>(from.val);
+}
+
+// Specialization of cpp::popcount ('bit.h') for BigInt.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<is_big_int_v<T>, int>
+popcount(T value) {
+  int bits = 0;
+  for (auto word : value.val)
+    if (word)
+      bits += popcount(word);
+  return bits;
+}
+
+// Specialization of cpp::has_single_bit ('bit.h') for BigInt.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<is_big_int_v<T>, bool>
+has_single_bit(T value) {
+  int bits = 0;
+  for (auto word : value.val) {
+    if (word == 0)
+      continue;
+    bits += popcount(word);
+    if (bits > 1)
+      return false;
+  }
+  return bits == 1;
+}
+
+// Specialization of cpp::countr_zero ('bit.h') for BigInt.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<is_big_int_v<T>, int>
+countr_zero(const T &value) {
+  return multiword::countr_zero(value.val);
+}
+
+// Specialization of cpp::countl_zero ('bit.h') for BigInt.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<is_big_int_v<T>, int>
+countl_zero(const T &value) {
+  return multiword::countl_zero(value.val);
+}
+
+// Specialization of cpp::countl_one ('bit.h') for BigInt.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<is_big_int_v<T>, int>
+countl_one(T value) {
+  return multiword::countl_one(value.val);
+}
+
+// Specialization of cpp::countr_one ('bit.h') for BigInt.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<is_big_int_v<T>, int>
+countr_one(T value) {
+  return multiword::countr_one(value.val);
+}
+
+// Specialization of cpp::bit_width ('bit.h') for BigInt.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<is_big_int_v<T>, int>
+bit_width(T value) {
+  return cpp::numeric_limits<T>::digits - cpp::countl_zero(value);
+}
+
+// Forward-declare rotr so that rotl can use it.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<is_big_int_v<T>, T>
+rotr(T value, int rotate);
+
+// Specialization of cpp::rotl ('bit.h') for BigInt.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<is_big_int_v<T>, T>
+rotl(T value, int rotate) {
+  constexpr int N = cpp::numeric_limits<T>::digits;
+  rotate = rotate % N;
+  if (!rotate)
+    return value;
+  if (rotate < 0)
+    return cpp::rotr<T>(value, -rotate);
+  return (value << static_cast<size_t>(rotate)) |
+         (value >> (N - static_cast<size_t>(rotate)));
+}
+
+// Specialization of cpp::rotr ('bit.h') for BigInt.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<is_big_int_v<T>, T>
+rotr(T value, int rotate) {
+  constexpr int N = cpp::numeric_limits<T>::digits;
+  rotate = rotate % N;
+  if (!rotate)
+    return value;
+  if (rotate < 0)
+    return cpp::rotl<T>(value, -rotate);
+  return (value >> static_cast<size_t>(rotate)) |
+         (value << (N - static_cast<size_t>(rotate)));
+}
+
+} // namespace cpp
+
+// Specialization of mask_trailing_ones ('math_extras.h') for BigInt.
+template <typename T, size_t count>
+LIBC_INLINE constexpr cpp::enable_if_t<is_big_int_v<T>, T>
+mask_trailing_ones() {
+  static_assert(!T::SIGNED && count <= T::BITS);
+  if (count == T::BITS)
+    return T::all_ones();
+  constexpr size_t QUOTIENT = count / T::WORD_SIZE;
+  constexpr size_t REMAINDER = count % T::WORD_SIZE;
+  T out; // zero initialized
+  for (size_t i = 0; i <= QUOTIENT; ++i)
+    out[i] = i < QUOTIENT
+                 ? cpp::numeric_limits<typename T::word_type>::max()
+                 : mask_trailing_ones<typename T::word_type, REMAINDER>();
+  return out;
+}
+
+// Specialization of mask_leading_ones ('math_extras.h') for BigInt.
+template <typename T, size_t count>
+LIBC_INLINE constexpr cpp::enable_if_t<is_big_int_v<T>, T> mask_leading_ones() {
+  static_assert(!T::SIGNED && count <= T::BITS);
+  if (count == T::BITS)
+    return T::all_ones();
+  constexpr size_t QUOTIENT = (T::BITS - count - 1U) / T::WORD_SIZE;
+  constexpr size_t REMAINDER = count % T::WORD_SIZE;
+  T out; // zero initialized
+  for (size_t i = QUOTIENT; i < T::WORD_COUNT; ++i)
+    out[i] = i > QUOTIENT
+                 ? cpp::numeric_limits<typename T::word_type>::max()
+                 : mask_leading_ones<typename T::word_type, REMAINDER>();
+  return out;
+}
+
+// Specialization of mask_trailing_zeros ('math_extras.h') for BigInt.
+template <typename T, size_t count>
+LIBC_INLINE constexpr cpp::enable_if_t<is_big_int_v<T>, T>
+mask_trailing_zeros() {
+  return mask_leading_ones<T, T::BITS - count>();
+}
+
+// Specialization of mask_leading_zeros ('math_extras.h') for BigInt.
+template <typename T, size_t count>
+LIBC_INLINE constexpr cpp::enable_if_t<is_big_int_v<T>, T>
+mask_leading_zeros() {
+  return mask_trailing_ones<T, T::BITS - count>();
+}
+
+// Specialization of count_zeros ('math_extras.h') for BigInt.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<is_big_int_v<T>, int>
+count_zeros(T value) {
+  return cpp::popcount(~value);
+}
+
+// Specialization of first_leading_zero ('math_extras.h') for BigInt.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<is_big_int_v<T>, int>
+first_leading_zero(T value) {
+  return value == cpp::numeric_limits<T>::max() ? 0
+                                                : cpp::countl_one(value) + 1;
+}
+
+// Specialization of first_leading_one ('math_extras.h') for BigInt.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<is_big_int_v<T>, int>
+first_leading_one(T value) {
+  return first_leading_zero(~value);
+}
+
+// Specialization of first_trailing_zero ('math_extras.h') for BigInt.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<is_big_int_v<T>, int>
+first_trailing_zero(T value) {
+  return value == cpp::numeric_limits<T>::max() ? 0
+                                                : cpp::countr_zero(~value) + 1;
+}
+
+// Specialization of first_trailing_one ('math_extras.h') for BigInt.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<is_big_int_v<T>, int>
+first_trailing_one(T value) {
+  return value == 0 ? 0 : cpp::countr_zero(value) + 1;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_BIG_INT_H
diff --git a/contrib/llvm-project/libc/src/__support/block.h b/contrib/llvm-project/libc/src/__support/block.h
new file mode 100644
index 000000000000..a58c38bbb7ac
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/block.h
@@ -0,0 +1,482 @@
+//===-- Implementation header for a block of memory -------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_BLOCK_H
+#define LLVM_LIBC_SRC___SUPPORT_BLOCK_H
+
+#include "src/__support/CPP/algorithm.h"
+#include "src/__support/CPP/cstddef.h"
+#include "src/__support/CPP/limits.h"
+#include "src/__support/CPP/new.h"
+#include "src/__support/CPP/optional.h"
+#include "src/__support/CPP/span.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/libc_assert.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/math_extras.h"
+
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+
+/// Returns the value rounded down to the nearest multiple of alignment.
+LIBC_INLINE constexpr size_t align_down(size_t value, size_t alignment) {
+  // Note this shouldn't overflow since the result will always be <= value.
+  return (value / alignment) * alignment;
+}
+
+/// Returns the value rounded up to the nearest multiple of alignment. May wrap
+/// around.
+LIBC_INLINE constexpr size_t align_up(size_t value, size_t alignment) {
+  return align_down(value + alignment - 1, alignment);
+}
+
+using ByteSpan = cpp::span<LIBC_NAMESPACE::cpp::byte>;
+using cpp::optional;
+
+/// Memory region with links to adjacent blocks.
+///
+/// The blocks store their offsets to the previous and next blocks. The latter
+/// is also the block's size.
+///
+/// All blocks have their usable space aligned to some multiple of max_align_t.
+/// This also implies that block outer sizes are aligned to max_align_t.
+///
+/// As an example, the diagram below represents two contiguous `Block`s. The
+/// indices indicate byte offsets:
+///
+/// @code{.unparsed}
+/// Block 1:
+/// +---------------------+--------------+
+/// | Header              | Usable space |
+/// +----------+----------+--------------+
+/// | prev     | next     |              |
+/// | 0......3 | 4......7 | 8........227 |
+/// | 00000000 | 00000230 |  <app data>  |
+/// +----------+----------+--------------+
+/// Block 2:
+/// +---------------------+--------------+
+/// | Header              | Usable space |
+/// +----------+----------+--------------+
+/// | prev     | next     |              |
+/// | 0......3 | 4......7 | 8........827 |
+/// | 00000230 | 00000830 | f7f7....f7f7 |
+/// +----------+----------+--------------+
+/// @endcode
+///
+/// As a space optimization, when a block is allocated, it consumes the prev
+/// field of the following block:
+///
+/// Block 1 (used):
+/// +---------------------+--------------+
+/// | Header              | Usable space |
+/// +----------+----------+--------------+
+/// | prev     | next     |              |
+/// | 0......3 | 4......7 | 8........230 |
+/// | 00000000 | 00000230 |  <app data>  |
+/// +----------+----------+--------------+
+/// Block 2:
+/// +---------------------+--------------+
+/// | B1       | Header   | Usable space |
+/// +----------+----------+--------------+
+/// |          | next     |              |
+/// | 0......3 | 4......7 | 8........827 |
+/// | xxxxxxxx | 00000830 | f7f7....f7f7 |
+/// +----------+----------+--------------+
+///
+/// The next offset of a block matches the previous offset of its next block.
+/// The first block in a list is denoted by having a previous offset of `0`.
+class Block {
+  // Masks for the contents of the next_ field.
+  static constexpr size_t PREV_FREE_MASK = 1 << 0;
+  static constexpr size_t LAST_MASK = 1 << 1;
+  static constexpr size_t SIZE_MASK = ~(PREV_FREE_MASK | LAST_MASK);
+
+public:
+  // No copy or move.
+  Block(const Block &other) = delete;
+  Block &operator=(const Block &other) = delete;
+
+  /// Initializes a given memory region into a first block and a sentinel last
+  /// block. Returns the first block, which has its usable space aligned to
+  /// max_align_t.
+  static optional<Block *> init(ByteSpan region);
+
+  /// @returns  A pointer to a `Block`, given a pointer to the start of the
+  ///           usable space inside the block.
+  ///
+  /// This is the inverse of `usable_space()`.
+  ///
+  /// @warning  This method does not do any checking; passing a random
+  ///           pointer will return a non-null pointer.
+  LIBC_INLINE static Block *from_usable_space(void *usable_space) {
+    auto *bytes = reinterpret_cast<cpp::byte *>(usable_space);
+    return reinterpret_cast<Block *>(bytes - sizeof(Block));
+  }
+  LIBC_INLINE static const Block *from_usable_space(const void *usable_space) {
+    const auto *bytes = reinterpret_cast<const cpp::byte *>(usable_space);
+    return reinterpret_cast<const Block *>(bytes - sizeof(Block));
+  }
+
+  /// @returns The total size of the block in bytes, including the header.
+  LIBC_INLINE size_t outer_size() const { return next_ & SIZE_MASK; }
+
+  LIBC_INLINE static size_t outer_size(size_t inner_size) {
+    // The usable region includes the prev_ field of the next block.
+    return inner_size - sizeof(prev_) + sizeof(Block);
+  }
+
+  /// @returns The number of usable bytes inside the block were it to be
+  /// allocated.
+  LIBC_INLINE size_t inner_size() const {
+    if (!next())
+      return 0;
+    return inner_size(outer_size());
+  }
+
+  /// @returns The number of usable bytes inside a block with the given outer
+  /// size were it to be allocated.
+  LIBC_INLINE static size_t inner_size(size_t outer_size) {
+    // The usable region includes the prev_ field of the next block.
+    return inner_size_free(outer_size) + sizeof(prev_);
+  }
+
+  /// @returns The number of usable bytes inside the block if it remains free.
+  LIBC_INLINE size_t inner_size_free() const {
+    if (!next())
+      return 0;
+    return inner_size_free(outer_size());
+  }
+
+  /// @returns The number of usable bytes inside a block with the given outer
+  /// size if it remains free.
+  LIBC_INLINE static size_t inner_size_free(size_t outer_size) {
+    return outer_size - sizeof(Block);
+  }
+
+  /// @returns A pointer to the usable space inside this block.
+  ///
+  /// Aligned to some multiple of max_align_t.
+  LIBC_INLINE cpp::byte *usable_space() {
+    auto *s = reinterpret_cast<cpp::byte *>(this) + sizeof(Block);
+    LIBC_ASSERT(reinterpret_cast<uintptr_t>(s) % alignof(max_align_t) == 0 &&
+                "usable space must be aligned to a multiple of max_align_t");
+    return s;
+  }
+  LIBC_INLINE const cpp::byte *usable_space() const {
+    const auto *s = reinterpret_cast<const cpp::byte *>(this) + sizeof(Block);
+    LIBC_ASSERT(reinterpret_cast<uintptr_t>(s) % alignof(max_align_t) == 0 &&
+                "usable space must be aligned to a multiple of max_align_t");
+    return s;
+  }
+
+  // @returns The region of memory the block manages, including the header.
+  LIBC_INLINE ByteSpan region() {
+    return {reinterpret_cast<cpp::byte *>(this), outer_size()};
+  }
+
+  /// Attempts to split this block.
+  ///
+  /// If successful, the block will have an inner size of at least
+  /// `new_inner_size`. The remaining space will be returned as a new block,
+  /// with usable space aligned to `usable_space_alignment`. Note that the prev_
+  /// field of the next block counts as part of the inner size of the block.
+  /// `usable_space_alignment` must be a multiple of max_align_t.
+  optional<Block *> split(size_t new_inner_size,
+                          size_t usable_space_alignment = alignof(max_align_t));
+
+  /// Merges this block with the one that comes after it.
+  bool merge_next();
+
+  /// @returns The block immediately after this one, or a null pointer if this
+  /// is the last block.
+  LIBC_INLINE Block *next() const {
+    if (next_ & LAST_MASK)
+      return nullptr;
+    return reinterpret_cast<Block *>(reinterpret_cast<uintptr_t>(this) +
+                                     outer_size());
+  }
+
+  /// @returns The free block immediately before this one, otherwise nullptr.
+  LIBC_INLINE Block *prev_free() const {
+    if (!(next_ & PREV_FREE_MASK))
+      return nullptr;
+    return reinterpret_cast<Block *>(reinterpret_cast<uintptr_t>(this) - prev_);
+  }
+
+  /// @returns Whether the block is unavailable for allocation.
+  LIBC_INLINE bool used() const { return !next() || !next()->prev_free(); }
+
+  /// Marks this block as in use.
+  LIBC_INLINE void mark_used() {
+    LIBC_ASSERT(next() && "last block is always considered used");
+    next()->next_ &= ~PREV_FREE_MASK;
+  }
+
+  /// Marks this block as free.
+  LIBC_INLINE void mark_free() {
+    LIBC_ASSERT(next() && "last block is always considered used");
+    next()->next_ |= PREV_FREE_MASK;
+    // The next block's prev_ field becomes alive, as it is no longer part of
+    // this block's used space.
+    *new (&next()->prev_) size_t = outer_size();
+  }
+
+  LIBC_INLINE Block(size_t outer_size, bool is_last) : next_(outer_size) {
+    // Last blocks are not usable, so they need not have sizes aligned to
+    // max_align_t. Their lower bits must still be free, so they must be aligned
+    // to Block.
+    LIBC_ASSERT(
+        outer_size % (is_last ? alignof(Block) : alignof(max_align_t)) == 0 &&
+        "block sizes must be aligned");
+    LIBC_ASSERT(is_usable_space_aligned(alignof(max_align_t)) &&
+                "usable space must be aligned to a multiple of max_align_t");
+    if (is_last)
+      next_ |= LAST_MASK;
+  }
+
+  LIBC_INLINE bool is_usable_space_aligned(size_t alignment) const {
+    return reinterpret_cast<uintptr_t>(usable_space()) % alignment == 0;
+  }
+
+  // Returns the minimum inner size necessary for a block of that size to
+  // always be able to allocate at the given size and alignment.
+  //
+  // Returns 0 if there is no such size.
+  LIBC_INLINE static size_t min_size_for_allocation(size_t alignment,
+                                                    size_t size) {
+    LIBC_ASSERT(alignment >= alignof(max_align_t) &&
+                alignment % alignof(max_align_t) == 0 &&
+                "alignment must be multiple of max_align_t");
+
+    if (alignment == alignof(max_align_t))
+      return size;
+
+    // We must create a new block inside this one (splitting). This requires a
+    // block header in addition to the requested size.
+    if (add_overflow(size, sizeof(Block), size))
+      return 0;
+
+    // Beyond that, padding space may need to remain in this block to ensure
+    // that the usable space of the next block is aligned.
+    //
+    // Consider a position P of some lesser alignment, L, with maximal distance
+    // to the next position of some greater alignment, G, where G is a multiple
+    // of L. P must be one L unit past a G-aligned point. If it were one L-unit
+    // earlier, its distance would be zero. If it were one L-unit later, its
+    // distance would not be maximal. If it were not some integral number of L
+    // units away, it would not be L-aligned.
+    //
+    // So the maximum distance would be G - L. As a special case, if L is 1
+    // (unaligned), the max distance is G - 1.
+    //
+    // This block's usable space is aligned to max_align_t >= Block. With zero
+    // padding, the next block's usable space is sizeof(Block) past it, which is
+    // a point aligned to Block. Thus the max padding needed is alignment -
+    // alignof(Block).
+    if (add_overflow(size, alignment - alignof(Block), size))
+      return 0;
+    return size;
+  }
+
+  // This is the return type for `allocate` which can split one block into up to
+  // three blocks.
+  struct BlockInfo {
+    // This is the newly aligned block. It will have the alignment requested by
+    // a call to `allocate` and at most `size`.
+    Block *block;
+
+    // If the usable_space in the new block was not aligned according to the
+    // `alignment` parameter, we will need to split into this block and the
+    // `block` to ensure `block` is properly aligned. In this case, `prev` will
+    // be a pointer to this new "padding" block. `prev` will be nullptr if no
+    // new block was created or we were able to merge the block before the
+    // original block with the "padding" block.
+    Block *prev;
+
+    // This is the remainder of the next block after splitting the `block`
+    // according to `size`. This can happen if there's enough space after the
+    // `block`.
+    Block *next;
+  };
+
+  // Divide a block into up to 3 blocks according to `BlockInfo`. Behavior is
+  // undefined if allocation is not possible for the given size and alignment.
+  static BlockInfo allocate(Block *block, size_t alignment, size_t size);
+
+  // These two functions may wrap around.
+  LIBC_INLINE static uintptr_t next_possible_block_start(
+      uintptr_t ptr, size_t usable_space_alignment = alignof(max_align_t)) {
+    return align_up(ptr + sizeof(Block), usable_space_alignment) -
+           sizeof(Block);
+  }
+  LIBC_INLINE static uintptr_t prev_possible_block_start(
+      uintptr_t ptr, size_t usable_space_alignment = alignof(max_align_t)) {
+    return align_down(ptr, usable_space_alignment) - sizeof(Block);
+  }
+
+private:
+  /// Construct a block to represent a span of bytes. Overwrites only enough
+  /// memory for the block header; the rest of the span is left alone.
+  LIBC_INLINE static Block *as_block(ByteSpan bytes) {
+    LIBC_ASSERT(reinterpret_cast<uintptr_t>(bytes.data()) % alignof(Block) ==
+                    0 &&
+                "block start must be suitably aligned");
+    return ::new (bytes.data()) Block(bytes.size(), /*is_last=*/false);
+  }
+
+  LIBC_INLINE static void make_last_block(cpp::byte *start) {
+    LIBC_ASSERT(reinterpret_cast<uintptr_t>(start) % alignof(Block) == 0 &&
+                "block start must be suitably aligned");
+    ::new (start) Block(sizeof(Block), /*is_last=*/true);
+  }
+
+  /// Offset from this block to the previous block. 0 if this is the first
+  /// block. This field is only alive when the previous block is free;
+  /// otherwise, its memory is reused as part of the previous block's usable
+  /// space.
+  size_t prev_ = 0;
+
+  /// Offset from this block to the next block. Valid even if this is the last
+  /// block, since it equals the size of the block.
+  size_t next_ = 0;
+
+  /// Information about the current state of the block is stored in the two low
+  /// order bits of the next_ value. These are guaranteed free by a minimum
+  /// alignment (and thus, alignment of the size) of 4. The lowest bit is the
+  /// `prev_free` flag, and the other bit is the `last` flag.
+  ///
+  /// * If the `prev_free` flag is set, the block isn't the first and the
+  ///   previous block is free.
+  /// * If the `last` flag is set, the block is the sentinel last block. It is
+  ///   summarily considered used and has no next block.
+
+public:
+  /// Only for testing.
+  static constexpr size_t PREV_FIELD_SIZE = sizeof(prev_);
+};
+
+static_assert(alignof(Block) >= 4,
+              "at least 2 bits must be available in block sizes for flags");
+
+LIBC_INLINE
+optional<Block *> Block::init(ByteSpan region) {
+  if (!region.data())
+    return {};
+
+  uintptr_t start = reinterpret_cast<uintptr_t>(region.data());
+  uintptr_t end = start + region.size();
+  if (end < start)
+    return {};
+
+  uintptr_t block_start = next_possible_block_start(start);
+  if (block_start < start)
+    return {};
+
+  uintptr_t last_start = prev_possible_block_start(end);
+  if (last_start >= end)
+    return {};
+
+  if (block_start + sizeof(Block) > last_start)
+    return {};
+
+  auto *last_start_ptr = reinterpret_cast<cpp::byte *>(last_start);
+  Block *block =
+      as_block({reinterpret_cast<cpp::byte *>(block_start), last_start_ptr});
+  make_last_block(last_start_ptr);
+  block->mark_free();
+  return block;
+}
+
+LIBC_INLINE
+Block::BlockInfo Block::allocate(Block *block, size_t alignment, size_t size) {
+  LIBC_ASSERT(alignment % alignof(max_align_t) == 0 &&
+              "alignment must be a multiple of max_align_t");
+
+  BlockInfo info{block, /*prev=*/nullptr, /*next=*/nullptr};
+
+  if (!info.block->is_usable_space_aligned(alignment)) {
+    Block *original = info.block;
+    // The padding block has no minimum size requirement.
+    optional<Block *> maybe_aligned_block = original->split(0, alignment);
+    LIBC_ASSERT(maybe_aligned_block.has_value() &&
+                "it should always be possible to split for alignment");
+
+    if (Block *prev = original->prev_free()) {
+      // If there is a free block before this, we can merge the current one with
+      // the newly created one.
+      prev->merge_next();
+    } else {
+      info.prev = original;
+    }
+
+    Block *aligned_block = *maybe_aligned_block;
+    LIBC_ASSERT(aligned_block->is_usable_space_aligned(alignment) &&
+                "The aligned block isn't aligned somehow.");
+    info.block = aligned_block;
+  }
+
+  // Now get a block for the requested size.
+  if (optional<Block *> next = info.block->split(size))
+    info.next = *next;
+
+  return info;
+}
+
+LIBC_INLINE
+optional<Block *> Block::split(size_t new_inner_size,
+                               size_t usable_space_alignment) {
+  LIBC_ASSERT(usable_space_alignment % alignof(max_align_t) == 0 &&
+              "alignment must be a multiple of max_align_t");
+  if (used())
+    return {};
+
+  // Compute the minimum outer size that produces a block of at least
+  // `new_inner_size`.
+  size_t min_outer_size = outer_size(cpp::max(new_inner_size, sizeof(prev_)));
+
+  uintptr_t start = reinterpret_cast<uintptr_t>(this);
+  uintptr_t next_block_start =
+      next_possible_block_start(start + min_outer_size, usable_space_alignment);
+  if (next_block_start < start)
+    return {};
+  size_t new_outer_size = next_block_start - start;
+  LIBC_ASSERT(new_outer_size % alignof(max_align_t) == 0 &&
+              "new size must be aligned to max_align_t");
+
+  if (outer_size() < new_outer_size ||
+      outer_size() - new_outer_size < sizeof(Block))
+    return {};
+
+  ByteSpan new_region = region().subspan(new_outer_size);
+  next_ &= ~SIZE_MASK;
+  next_ |= new_outer_size;
+
+  Block *new_block = as_block(new_region);
+  mark_free(); // Free status for this block is now stored in new_block.
+  new_block->next()->prev_ = new_region.size();
+
+  LIBC_ASSERT(new_block->is_usable_space_aligned(usable_space_alignment) &&
+              "usable space must have requested alignment");
+  return new_block;
+}
+
+LIBC_INLINE
+bool Block::merge_next() {
+  if (used() || next()->used())
+    return false;
+  size_t new_size = outer_size() + next()->outer_size();
+  next_ &= ~SIZE_MASK;
+  next_ |= new_size;
+  next()->prev_ = new_size;
+  return true;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_BLOCK_H
diff --git a/contrib/llvm-project/libc/src/__support/blockstore.h b/contrib/llvm-project/libc/src/__support/blockstore.h
new file mode 100644
index 000000000000..efe2234eace5
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/blockstore.h
@@ -0,0 +1,262 @@
+//===-- A data structure which stores data in blocks  -----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_BLOCKSTORE_H
+#define LLVM_LIBC_SRC___SUPPORT_BLOCKSTORE_H
+
+#include "src/__support/CPP/array.h"
+#include "src/__support/CPP/new.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/libc_assert.h"
+#include "src/__support/macros/config.h"
+
+#include <stddef.h>
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+
+// The difference between BlockStore a traditional vector types is that,
+// when more capacity is desired, a new block is added instead of allocating
+// a larger sized array and copying over existing items to the new allocation.
+// Also, the initial block does not need heap allocation. Hence, a BlockStore is
+// suitable for global objects as it does not require explicit construction.
+// Also, the destructor of this class does nothing, which eliminates the need
+// for an atexit global object destruction. But, it also means that the global
+// object should be explicitly cleaned up at the appropriate time.
+//
+// If REVERSE_ORDER is true, the iteration of elements will in the reverse
+// order. Also, since REVERSE_ORDER is a constexpr, conditionals branching
+// on its value will be optimized out in the code below.
+template <typename T, size_t BLOCK_SIZE, bool REVERSE_ORDER = false>
+class BlockStore {
+protected:
+  struct Block {
+    alignas(T) uint8_t data[BLOCK_SIZE * sizeof(T)] = {0};
+    Block *next = nullptr;
+  };
+
+  Block first;
+  Block *current = &first;
+  size_t fill_count = 0;
+
+  struct Pair {
+    Block *first, *second;
+  };
+  LIBC_INLINE Pair get_last_blocks() {
+    if (REVERSE_ORDER)
+      return {current, current->next};
+    Block *prev = nullptr;
+    Block *curr = &first;
+    for (; curr->next; prev = curr, curr = curr->next)
+      ;
+    LIBC_ASSERT(curr == current);
+    return {curr, prev};
+  }
+
+  LIBC_INLINE Block *get_last_block() { return get_last_blocks().first; }
+
+public:
+  LIBC_INLINE constexpr BlockStore() = default;
+  LIBC_INLINE ~BlockStore() = default;
+
+  class Iterator {
+    Block *block;
+    size_t index;
+
+  public:
+    LIBC_INLINE constexpr Iterator(Block *b, size_t i) : block(b), index(i) {}
+
+    LIBC_INLINE Iterator &operator++() {
+      if (REVERSE_ORDER) {
+        if (index == 0)
+          return *this;
+
+        --index;
+        if (index == 0 && block->next != nullptr) {
+          index = BLOCK_SIZE;
+          block = block->next;
+        }
+      } else {
+        if (index == BLOCK_SIZE)
+          return *this;
+
+        ++index;
+        if (index == BLOCK_SIZE && block->next != nullptr) {
+          index = 0;
+          block = block->next;
+        }
+      }
+
+      return *this;
+    }
+
+    LIBC_INLINE T &operator*() {
+      size_t true_index = REVERSE_ORDER ? index - 1 : index;
+      return *reinterpret_cast<T *>(block->data + sizeof(T) * true_index);
+    }
+
+    LIBC_INLINE Iterator operator+(int i) {
+      LIBC_ASSERT(i >= 0 &&
+                  "BlockStore iterators only support incrementation.");
+      auto other = *this;
+      for (int j = 0; j < i; ++j)
+        ++other;
+
+      return other;
+    }
+
+    LIBC_INLINE bool operator==(const Iterator &rhs) const {
+      return block == rhs.block && index == rhs.index;
+    }
+
+    LIBC_INLINE bool operator!=(const Iterator &rhs) const {
+      return block != rhs.block || index != rhs.index;
+    }
+  };
+
+  LIBC_INLINE static void
+  destroy(BlockStore<T, BLOCK_SIZE, REVERSE_ORDER> *block_store);
+
+  LIBC_INLINE T *new_obj() {
+    if (fill_count == BLOCK_SIZE) {
+      AllocChecker ac;
+      auto new_block = new (ac) Block();
+      if (!ac)
+        return nullptr;
+      if (REVERSE_ORDER) {
+        new_block->next = current;
+      } else {
+        new_block->next = nullptr;
+        current->next = new_block;
+      }
+      current = new_block;
+      fill_count = 0;
+    }
+    T *obj = reinterpret_cast<T *>(current->data + fill_count * sizeof(T));
+    ++fill_count;
+    return obj;
+  }
+
+  [[nodiscard]] LIBC_INLINE bool push_back(const T &value) {
+    T *ptr = new_obj();
+    if (ptr == nullptr)
+      return false;
+    *ptr = value;
+    return true;
+  }
+
+  LIBC_INLINE T &back() {
+    return *reinterpret_cast<T *>(get_last_block()->data +
+                                  sizeof(T) * (fill_count - 1));
+  }
+
+  LIBC_INLINE void pop_back() {
+    fill_count--;
+    if (fill_count || current == &first)
+      return;
+    auto [last, prev] = get_last_blocks();
+    if (REVERSE_ORDER) {
+      LIBC_ASSERT(last == current);
+      current = current->next;
+    } else {
+      LIBC_ASSERT(prev->next == last);
+      current = prev;
+      current->next = nullptr;
+    }
+    if (last != &first)
+      delete last;
+    fill_count = BLOCK_SIZE;
+  }
+
+  LIBC_INLINE bool empty() const { return current == &first && !fill_count; }
+
+  LIBC_INLINE Iterator begin() {
+    if (REVERSE_ORDER)
+      return Iterator(current, fill_count);
+    else
+      return Iterator(&first, 0);
+  }
+
+  LIBC_INLINE Iterator end() {
+    if (REVERSE_ORDER)
+      return Iterator(&first, 0);
+    else
+      return Iterator(current, fill_count);
+  }
+
+  // Removes the element at pos, then moves all the objects after back by one to
+  // fill the hole. It's assumed that pos is a valid iterator to somewhere in
+  // this block_store.
+  LIBC_INLINE void erase(Iterator pos) {
+    const Iterator last_item = Iterator(current, fill_count);
+    if (pos == last_item) {
+      pop_back();
+      return;
+    }
+
+    if constexpr (REVERSE_ORDER) {
+      // REVERSE: Iterate from begin to pos
+      const Iterator range_end = pos;
+      Iterator cur = begin();
+      T prev_val = *cur;
+      ++cur;
+      T cur_val = *cur;
+
+      for (; cur != range_end; ++cur) {
+        cur_val = *cur;
+        *cur = prev_val;
+        prev_val = cur_val;
+      }
+      // As long as this isn't the end we will always need to move at least one
+      // item (since we know that pos isn't the last item due to the check
+      // above).
+      if (range_end != end())
+        *cur = prev_val;
+    } else {
+      // FORWARD: Iterate from pos to end
+      const Iterator range_end = end();
+      Iterator cur = pos;
+      Iterator prev = cur;
+      ++cur;
+
+      for (; cur != range_end; prev = cur, ++cur)
+        *prev = *cur;
+    }
+    pop_back();
+  }
+};
+
+template <typename T, size_t BLOCK_SIZE, bool REVERSE_ORDER>
+LIBC_INLINE void BlockStore<T, BLOCK_SIZE, REVERSE_ORDER>::destroy(
+    BlockStore<T, BLOCK_SIZE, REVERSE_ORDER> *block_store) {
+  if (REVERSE_ORDER) {
+    auto current = block_store->current;
+    while (current->next != nullptr) {
+      auto temp = current;
+      current = current->next;
+      delete temp;
+    }
+  } else {
+    auto current = block_store->first.next;
+    while (current != nullptr) {
+      auto temp = current;
+      current = current->next;
+      delete temp;
+    }
+  }
+  block_store->current = nullptr;
+  block_store->fill_count = 0;
+}
+
+// A convenience type for reverse order block stores.
+template <typename T, size_t BLOCK_SIZE>
+using ReverseOrderBlockStore = BlockStore<T, BLOCK_SIZE, true>;
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_BLOCKSTORE_H
diff --git a/contrib/llvm-project/libc/src/__support/c_string.h b/contrib/llvm-project/libc/src/__support/c_string.h
new file mode 100644
index 000000000000..11f41320681a
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/c_string.h
@@ -0,0 +1,37 @@
+//===-- Implementation of a struct to hold a string in menory -------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_C_STRING_H
+#define LLVM_LIBC_SRC___SUPPORT_C_STRING_H
+
+#include "src/__support/CPP/string.h"
+#include "src/__support/macros/attributes.h" // for LIBC_INLINE
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+// The CString class is a companion to the cpp::string class. Its use case is as
+// a return value for a function that in C would return a char* and a flag for
+// if that char* needs to be freed.
+class CString {
+  cpp::string str;
+
+public:
+  // These constructors can be implemented iff required.
+  CString() = delete;
+  CString(const CString &) = delete;
+  CString(CString &&) = delete;
+
+  LIBC_INLINE CString(cpp::string in_str) : str(in_str) {}
+
+  LIBC_INLINE operator const char *() const { return str.c_str(); }
+};
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_C_STRING_H
diff --git a/contrib/llvm-project/libc/src/__support/char_vector.h b/contrib/llvm-project/libc/src/__support/char_vector.h
new file mode 100644
index 000000000000..d0837a8af3f4
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/char_vector.h
@@ -0,0 +1,81 @@
+//===-- Standalone implementation of a char vector --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CHARVECTOR_H
+#define LLVM_LIBC_SRC___SUPPORT_CHARVECTOR_H
+
+#include "hdr/func/free.h"
+#include "hdr/func/malloc.h"
+#include "hdr/func/realloc.h"
+#include "src/__support/common.h" // LIBC_INLINE
+#include "src/__support/macros/config.h"
+
+#include <stddef.h> // size_t
+
+namespace LIBC_NAMESPACE_DECL {
+
+// This is very simple alternate of the std::string class. There is no
+// bounds check performed in any of the methods. The callers are expected to
+// do the checks before invoking the methods.
+//
+// This class will be extended as needed in future.
+
+class CharVector {
+  static constexpr size_t INIT_BUFF_SIZE = 64;
+  char local_buffer[INIT_BUFF_SIZE];
+  char *cur_str = local_buffer;
+  size_t cur_buff_size = INIT_BUFF_SIZE;
+  size_t index = 0;
+
+public:
+  CharVector() = default;
+  LIBC_INLINE ~CharVector() {
+    if (cur_str != local_buffer)
+      free(cur_str);
+  }
+
+  // append returns true on success and false on allocation failure.
+  LIBC_INLINE bool append(char new_char) {
+    // Subtract 1 for index starting at 0 and another for the null terminator.
+    if (index >= cur_buff_size - 2) {
+      // If the new character would cause the string to be longer than the
+      // buffer's size, attempt to allocate a new buffer.
+      cur_buff_size = cur_buff_size * 2;
+      if (cur_str == local_buffer) {
+        char *new_str;
+        new_str = reinterpret_cast<char *>(malloc(cur_buff_size));
+        if (new_str == nullptr) {
+          return false;
+        }
+        // TODO: replace with inline memcpy
+        for (size_t i = 0; i < index; ++i)
+          new_str[i] = cur_str[i];
+        cur_str = new_str;
+      } else {
+        cur_str = reinterpret_cast<char *>(realloc(cur_str, cur_buff_size));
+        if (cur_str == nullptr) {
+          return false;
+        }
+      }
+    }
+    cur_str[index] = new_char;
+    ++index;
+    return true;
+  }
+
+  LIBC_INLINE char *c_str() {
+    cur_str[index] = '\0';
+    return cur_str;
+  }
+
+  LIBC_INLINE size_t length() { return index; }
+};
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CHARVECTOR_H
diff --git a/contrib/llvm-project/libc/src/__support/common.h b/contrib/llvm-project/libc/src/__support/common.h
new file mode 100644
index 000000000000..15209b76978a
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/common.h
@@ -0,0 +1,92 @@
+//===-- Common internal contructs -------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_COMMON_H
+#define LLVM_LIBC_SRC___SUPPORT_COMMON_H
+
+#ifndef LIBC_NAMESPACE
+#error "LIBC_NAMESPACE macro is not defined."
+#endif
+
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/architectures.h"
+
+#ifndef LLVM_LIBC_FUNCTION_ATTR
+#define LLVM_LIBC_FUNCTION_ATTR
+#endif
+
+// clang-format off
+// Allow each function `func` to have extra attributes specified by defining:
+// `LLVM_LIBC_FUNCTION_ATTR_func` macro, which should always start with
+// "LLVM_LIBC_EMPTY, "
+//
+// For examples:
+// #define LLVM_LIBC_FUNCTION_ATTR_memcpy LLVM_LIBC_EMPTY, [[gnu::weak]]
+// #define LLVM_LIBC_FUNCTION_ATTR_memchr LLVM_LIBC_EMPTY, [[gnu::weak]] [[gnu::visibility("default")]]
+// clang-format on
+#define LLVM_LIBC_EMPTY
+
+#define GET_SECOND(first, second, ...) second
+#define EXPAND_THEN_SECOND(name) GET_SECOND(name, LLVM_LIBC_EMPTY)
+
+#define LLVM_LIBC_ATTR(name) EXPAND_THEN_SECOND(LLVM_LIBC_FUNCTION_ATTR_##name)
+
+// At the moment, [[gnu::alias()]] is not supported on MacOS, and it is needed
+// to cleanly export and alias the C++ symbol `LIBC_NAMESPACE::func` with the C
+// symbol `func`.  So for public packaging on MacOS, we will only export the C
+// symbol.  Moreover, a C symbol `func` in macOS is mangled as `_func`.
+#if defined(LIBC_COPT_PUBLIC_PACKAGING)
+#ifndef __APPLE__
+#define LLVM_LIBC_FUNCTION_IMPL(type, name, arglist)                           \
+  LLVM_LIBC_ATTR(name)                                                         \
+  LLVM_LIBC_FUNCTION_ATTR decltype(LIBC_NAMESPACE::name)                       \
+      __##name##_impl__ __asm__(#name);                                        \
+  decltype(LIBC_NAMESPACE::name) name [[gnu::alias(#name)]];                   \
+  type __##name##_impl__ arglist
+#else // __APPLE__
+#define LLVM_LIBC_FUNCTION_IMPL(type, name, arglist)                           \
+  LLVM_LIBC_ATTR(name)                                                         \
+  LLVM_LIBC_FUNCTION_ATTR decltype(LIBC_NAMESPACE::name) name asm("_" #name);  \
+  type name arglist
+#endif // __APPLE__
+#else  // LIBC_COPT_PUBLIC_PACKAGING
+#define LLVM_LIBC_FUNCTION_IMPL(type, name, arglist) type name arglist
+#endif // LIBC_COPT_PUBLIC_PACKAGING
+
+// This extra layer of macro allows `name` to be a macro to rename a function.
+#define LLVM_LIBC_FUNCTION(type, name, arglist)                                \
+  LLVM_LIBC_FUNCTION_IMPL(type, name, arglist)
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+LIBC_INLINE constexpr bool same_string(char const *lhs, char const *rhs) {
+  for (; *lhs || *rhs; ++lhs, ++rhs)
+    if (*lhs != *rhs)
+      return false;
+  return true;
+}
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
+
+#define __LIBC_MACRO_TO_STRING(str) #str
+#define LIBC_MACRO_TO_STRING(str) __LIBC_MACRO_TO_STRING(str)
+
+// LLVM_LIBC_IS_DEFINED checks whether a particular macro is defined.
+// Usage: constexpr bool kUseAvx = LLVM_LIBC_IS_DEFINED(__AVX__);
+//
+// This works by comparing the stringified version of the macro with and without
+// evaluation. If FOO is not undefined both stringifications yield "FOO". If FOO
+// is defined, one stringification yields "FOO" while the other yields its
+// stringified value "1".
+#define LLVM_LIBC_IS_DEFINED(macro)                                            \
+  !LIBC_NAMESPACE::internal::same_string(                                      \
+      LLVM_LIBC_IS_DEFINED__EVAL_AND_STRINGIZE(macro), #macro)
+#define LLVM_LIBC_IS_DEFINED__EVAL_AND_STRINGIZE(s) #s
+
+#endif // LLVM_LIBC_SRC___SUPPORT_COMMON_H
diff --git a/contrib/llvm-project/libc/src/__support/complex_basic_ops.h b/contrib/llvm-project/libc/src/__support/complex_basic_ops.h
new file mode 100644
index 000000000000..5992ebec0786
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/complex_basic_ops.h
@@ -0,0 +1,36 @@
+//===-- complex basic operations --------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_COMPLEX_BASIC_OPERATIONS_H
+#define LLVM_LIBC_SRC___SUPPORT_COMPLEX_BASIC_OPERATIONS_H
+
+#include "complex_type.h"
+#include "src/__support/CPP/bit.h"
+#include "src/__support/FPUtil/FPBits.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+template <typename T> LIBC_INLINE constexpr T conjugate(T c) {
+  Complex<make_real_t<T>> c_c = cpp::bit_cast<Complex<make_real_t<T>>>(c);
+  c_c.imag = -c_c.imag;
+  return cpp::bit_cast<T>(c_c);
+}
+
+template <typename T> LIBC_INLINE constexpr T project(T c) {
+  using real_t = make_real_t<T>;
+  Complex<real_t> c_c = cpp::bit_cast<Complex<real_t>>(c);
+  if (fputil::FPBits<real_t>(c_c.real).is_inf() ||
+      fputil::FPBits<real_t>(c_c.imag).is_inf())
+    return cpp::bit_cast<T>(
+        Complex<real_t>{(fputil::FPBits<real_t>::inf(Sign::POS).get_val()),
+                        static_cast<real_t>(c_c.imag > 0 ? 0.0 : -0.0)});
+  return c;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+#endif // LLVM_LIBC_SRC___SUPPORT_COMPLEX_BASIC_OPERATIONS_H
diff --git a/contrib/llvm-project/libc/src/__support/complex_type.h b/contrib/llvm-project/libc/src/__support/complex_type.h
new file mode 100644
index 000000000000..93089de61dba
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/complex_type.h
@@ -0,0 +1,73 @@
+//===-- complex type --------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_COMPLEX_TYPE_H
+#define LLVM_LIBC_SRC___SUPPORT_COMPLEX_TYPE_H
+
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/complex_types.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+template <typename T> struct Complex {
+  T real;
+  T imag;
+};
+
+template <typename T> struct make_complex;
+
+template <> struct make_complex<float> {
+  using type = _Complex float;
+};
+template <> struct make_complex<double> {
+  using type = _Complex double;
+};
+template <> struct make_complex<long double> {
+  using type = _Complex long double;
+};
+
+#if defined(LIBC_TYPES_HAS_CFLOAT16)
+template <> struct make_complex<float16> {
+  using type = cfloat16;
+};
+#endif
+#ifdef LIBC_TYPES_CFLOAT128_IS_NOT_COMPLEX_LONG_DOUBLE
+template <> struct make_complex<float128> {
+  using type = cfloat128;
+};
+#endif
+
+template <typename T> using make_complex_t = typename make_complex<T>::type;
+
+template <typename T> struct make_real;
+
+template <> struct make_real<_Complex float> {
+  using type = float;
+};
+template <> struct make_real<_Complex double> {
+  using type = double;
+};
+template <> struct make_real<_Complex long double> {
+  using type = long double;
+};
+
+#if defined(LIBC_TYPES_HAS_CFLOAT16)
+template <> struct make_real<cfloat16> {
+  using type = float16;
+};
+#endif
+#ifdef LIBC_TYPES_CFLOAT128_IS_NOT_COMPLEX_LONG_DOUBLE
+template <> struct make_real<cfloat128> {
+  using type = float128;
+};
+#endif
+
+template <typename T> using make_real_t = typename make_real<T>::type;
+
+} // namespace LIBC_NAMESPACE_DECL
+#endif // LLVM_LIBC_SRC___SUPPORT_COMPLEX_TYPE_H
diff --git a/contrib/llvm-project/libc/src/__support/ctype_utils.h b/contrib/llvm-project/libc/src/__support/ctype_utils.h
new file mode 100644
index 000000000000..be0f25330af9
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/ctype_utils.h
@@ -0,0 +1,584 @@
+//===-- Collection of utils for implementing ctype functions-------*-C++-*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_CTYPE_UTILS_H
+#define LLVM_LIBC_SRC___SUPPORT_CTYPE_UTILS_H
+
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+// -----------------------------------------------------------------------------
+// ******************                 WARNING                 ******************
+// ****************** DO NOT TRY TO OPTIMIZE THESE FUNCTIONS! ******************
+// -----------------------------------------------------------------------------
+// This switch/case form is easier for the compiler to understand, and is
+// optimized into a form that is almost always the same as or better than
+// versions written by hand (see https://godbolt.org/z/qvrebqvvr). Also this
+// form makes these functions encoding independent. If you want to rewrite these
+// functions, make sure you have benchmarks to show your new solution is faster,
+// as well as a way to support non-ASCII character encodings.
+
+// Similarly, do not change these functions to use case ranges. e.g.
+//  bool islower(int ch) {
+//    switch(ch) {
+//    case 'a'...'z':
+//      return true;
+//    }
+//  }
+// This assumes the character ranges are contiguous, which they aren't in
+// EBCDIC. Technically we could use some smaller ranges, but that's even harder
+// to read.
+
+LIBC_INLINE static constexpr bool islower(int ch) {
+  switch (ch) {
+  case 'a':
+  case 'b':
+  case 'c':
+  case 'd':
+  case 'e':
+  case 'f':
+  case 'g':
+  case 'h':
+  case 'i':
+  case 'j':
+  case 'k':
+  case 'l':
+  case 'm':
+  case 'n':
+  case 'o':
+  case 'p':
+  case 'q':
+  case 'r':
+  case 's':
+  case 't':
+  case 'u':
+  case 'v':
+  case 'w':
+  case 'x':
+  case 'y':
+  case 'z':
+    return true;
+  default:
+    return false;
+  }
+}
+
+LIBC_INLINE static constexpr bool isupper(int ch) {
+  switch (ch) {
+  case 'A':
+  case 'B':
+  case 'C':
+  case 'D':
+  case 'E':
+  case 'F':
+  case 'G':
+  case 'H':
+  case 'I':
+  case 'J':
+  case 'K':
+  case 'L':
+  case 'M':
+  case 'N':
+  case 'O':
+  case 'P':
+  case 'Q':
+  case 'R':
+  case 'S':
+  case 'T':
+  case 'U':
+  case 'V':
+  case 'W':
+  case 'X':
+  case 'Y':
+  case 'Z':
+    return true;
+  default:
+    return false;
+  }
+}
+
+LIBC_INLINE static constexpr bool isdigit(int ch) {
+  switch (ch) {
+  case '0':
+  case '1':
+  case '2':
+  case '3':
+  case '4':
+  case '5':
+  case '6':
+  case '7':
+  case '8':
+  case '9':
+    return true;
+  default:
+    return false;
+  }
+}
+
+LIBC_INLINE static constexpr int tolower(int ch) {
+  switch (ch) {
+  case 'A':
+    return 'a';
+  case 'B':
+    return 'b';
+  case 'C':
+    return 'c';
+  case 'D':
+    return 'd';
+  case 'E':
+    return 'e';
+  case 'F':
+    return 'f';
+  case 'G':
+    return 'g';
+  case 'H':
+    return 'h';
+  case 'I':
+    return 'i';
+  case 'J':
+    return 'j';
+  case 'K':
+    return 'k';
+  case 'L':
+    return 'l';
+  case 'M':
+    return 'm';
+  case 'N':
+    return 'n';
+  case 'O':
+    return 'o';
+  case 'P':
+    return 'p';
+  case 'Q':
+    return 'q';
+  case 'R':
+    return 'r';
+  case 'S':
+    return 's';
+  case 'T':
+    return 't';
+  case 'U':
+    return 'u';
+  case 'V':
+    return 'v';
+  case 'W':
+    return 'w';
+  case 'X':
+    return 'x';
+  case 'Y':
+    return 'y';
+  case 'Z':
+    return 'z';
+  default:
+    return ch;
+  }
+}
+
+LIBC_INLINE static constexpr int toupper(int ch) {
+  switch (ch) {
+  case 'a':
+    return 'A';
+  case 'b':
+    return 'B';
+  case 'c':
+    return 'C';
+  case 'd':
+    return 'D';
+  case 'e':
+    return 'E';
+  case 'f':
+    return 'F';
+  case 'g':
+    return 'G';
+  case 'h':
+    return 'H';
+  case 'i':
+    return 'I';
+  case 'j':
+    return 'J';
+  case 'k':
+    return 'K';
+  case 'l':
+    return 'L';
+  case 'm':
+    return 'M';
+  case 'n':
+    return 'N';
+  case 'o':
+    return 'O';
+  case 'p':
+    return 'P';
+  case 'q':
+    return 'Q';
+  case 'r':
+    return 'R';
+  case 's':
+    return 'S';
+  case 't':
+    return 'T';
+  case 'u':
+    return 'U';
+  case 'v':
+    return 'V';
+  case 'w':
+    return 'W';
+  case 'x':
+    return 'X';
+  case 'y':
+    return 'Y';
+  case 'z':
+    return 'Z';
+  default:
+    return ch;
+  }
+}
+
+LIBC_INLINE static constexpr bool isalpha(int ch) {
+  switch (ch) {
+  case 'a':
+  case 'b':
+  case 'c':
+  case 'd':
+  case 'e':
+  case 'f':
+  case 'g':
+  case 'h':
+  case 'i':
+  case 'j':
+  case 'k':
+  case 'l':
+  case 'm':
+  case 'n':
+  case 'o':
+  case 'p':
+  case 'q':
+  case 'r':
+  case 's':
+  case 't':
+  case 'u':
+  case 'v':
+  case 'w':
+  case 'x':
+  case 'y':
+  case 'z':
+  case 'A':
+  case 'B':
+  case 'C':
+  case 'D':
+  case 'E':
+  case 'F':
+  case 'G':
+  case 'H':
+  case 'I':
+  case 'J':
+  case 'K':
+  case 'L':
+  case 'M':
+  case 'N':
+  case 'O':
+  case 'P':
+  case 'Q':
+  case 'R':
+  case 'S':
+  case 'T':
+  case 'U':
+  case 'V':
+  case 'W':
+  case 'X':
+  case 'Y':
+  case 'Z':
+    return true;
+  default:
+    return false;
+  }
+}
+
+LIBC_INLINE static constexpr bool isalnum(int ch) {
+  switch (ch) {
+  case 'a':
+  case 'b':
+  case 'c':
+  case 'd':
+  case 'e':
+  case 'f':
+  case 'g':
+  case 'h':
+  case 'i':
+  case 'j':
+  case 'k':
+  case 'l':
+  case 'm':
+  case 'n':
+  case 'o':
+  case 'p':
+  case 'q':
+  case 'r':
+  case 's':
+  case 't':
+  case 'u':
+  case 'v':
+  case 'w':
+  case 'x':
+  case 'y':
+  case 'z':
+  case 'A':
+  case 'B':
+  case 'C':
+  case 'D':
+  case 'E':
+  case 'F':
+  case 'G':
+  case 'H':
+  case 'I':
+  case 'J':
+  case 'K':
+  case 'L':
+  case 'M':
+  case 'N':
+  case 'O':
+  case 'P':
+  case 'Q':
+  case 'R':
+  case 'S':
+  case 'T':
+  case 'U':
+  case 'V':
+  case 'W':
+  case 'X':
+  case 'Y':
+  case 'Z':
+  case '0':
+  case '1':
+  case '2':
+  case '3':
+  case '4':
+  case '5':
+  case '6':
+  case '7':
+  case '8':
+  case '9':
+    return true;
+  default:
+    return false;
+  }
+}
+
+LIBC_INLINE static constexpr int b36_char_to_int(int ch) {
+  switch (ch) {
+  case '0':
+    return 0;
+  case '1':
+    return 1;
+  case '2':
+    return 2;
+  case '3':
+    return 3;
+  case '4':
+    return 4;
+  case '5':
+    return 5;
+  case '6':
+    return 6;
+  case '7':
+    return 7;
+  case '8':
+    return 8;
+  case '9':
+    return 9;
+  case 'a':
+  case 'A':
+    return 10;
+  case 'b':
+  case 'B':
+    return 11;
+  case 'c':
+  case 'C':
+    return 12;
+  case 'd':
+  case 'D':
+    return 13;
+  case 'e':
+  case 'E':
+    return 14;
+  case 'f':
+  case 'F':
+    return 15;
+  case 'g':
+  case 'G':
+    return 16;
+  case 'h':
+  case 'H':
+    return 17;
+  case 'i':
+  case 'I':
+    return 18;
+  case 'j':
+  case 'J':
+    return 19;
+  case 'k':
+  case 'K':
+    return 20;
+  case 'l':
+  case 'L':
+    return 21;
+  case 'm':
+  case 'M':
+    return 22;
+  case 'n':
+  case 'N':
+    return 23;
+  case 'o':
+  case 'O':
+    return 24;
+  case 'p':
+  case 'P':
+    return 25;
+  case 'q':
+  case 'Q':
+    return 26;
+  case 'r':
+  case 'R':
+    return 27;
+  case 's':
+  case 'S':
+    return 28;
+  case 't':
+  case 'T':
+    return 29;
+  case 'u':
+  case 'U':
+    return 30;
+  case 'v':
+  case 'V':
+    return 31;
+  case 'w':
+  case 'W':
+    return 32;
+  case 'x':
+  case 'X':
+    return 33;
+  case 'y':
+  case 'Y':
+    return 34;
+  case 'z':
+  case 'Z':
+    return 35;
+  default:
+    return 0;
+  }
+}
+
+LIBC_INLINE static constexpr int int_to_b36_char(int num) {
+  // Can't actually use LIBC_ASSERT here because it depends on integer_to_string
+  // which depends on this.
+
+  // LIBC_ASSERT(num < 36);
+  switch (num) {
+  case 0:
+    return '0';
+  case 1:
+    return '1';
+  case 2:
+    return '2';
+  case 3:
+    return '3';
+  case 4:
+    return '4';
+  case 5:
+    return '5';
+  case 6:
+    return '6';
+  case 7:
+    return '7';
+  case 8:
+    return '8';
+  case 9:
+    return '9';
+  case 10:
+    return 'a';
+  case 11:
+    return 'b';
+  case 12:
+    return 'c';
+  case 13:
+    return 'd';
+  case 14:
+    return 'e';
+  case 15:
+    return 'f';
+  case 16:
+    return 'g';
+  case 17:
+    return 'h';
+  case 18:
+    return 'i';
+  case 19:
+    return 'j';
+  case 20:
+    return 'k';
+  case 21:
+    return 'l';
+  case 22:
+    return 'm';
+  case 23:
+    return 'n';
+  case 24:
+    return 'o';
+  case 25:
+    return 'p';
+  case 26:
+    return 'q';
+  case 27:
+    return 'r';
+  case 28:
+    return 's';
+  case 29:
+    return 't';
+  case 30:
+    return 'u';
+  case 31:
+    return 'v';
+  case 32:
+    return 'w';
+  case 33:
+    return 'x';
+  case 34:
+    return 'y';
+  case 35:
+    return 'z';
+  default:
+    return '!';
+  }
+}
+
+LIBC_INLINE static constexpr bool isspace(int ch) {
+  switch (ch) {
+  case ' ':
+  case '\t':
+  case '\n':
+  case '\v':
+  case '\f':
+  case '\r':
+    return true;
+  default:
+    return false;
+  }
+}
+
+// not yet encoding independent.
+LIBC_INLINE static constexpr bool isgraph(int ch) {
+  return 0x20 < ch && ch < 0x7f;
+}
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif //  LLVM_LIBC_SRC___SUPPORT_CTYPE_UTILS_H
diff --git a/contrib/llvm-project/libc/src/__support/detailed_powers_of_ten.h b/contrib/llvm-project/libc/src/__support/detailed_powers_of_ten.h
new file mode 100644
index 000000000000..28741b8a3f56
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/detailed_powers_of_ten.h
@@ -0,0 +1,740 @@
+//===-- detailed powers of ten ----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_DETAILED_POWERS_OF_TEN_H
+#define LLVM_LIBC_SRC___SUPPORT_DETAILED_POWERS_OF_TEN_H
+
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+// TODO(michaelrj): write a script that will generate this table.
+
+// This table was generated by
+// https://github.com/google/wuffs/blob/788479dd64f35cb6b4e998a851acb06ee962435b/script/print-mpb-powers-of-10.go
+// and contains the 128 bit mantissa approximations of the powers of 10 from
+// -348 to 347. The exponents are implied by a linear expression with slope
+// 217706.0/65536.0 ≈ log(10)/log(2). This is used by the Eisel-Lemire algorithm
+// in str_to_float.h.
+
+constexpr int32_t DETAILED_POWERS_OF_TEN_MIN_EXP_10 = -348;
+constexpr int32_t DETAILED_POWERS_OF_TEN_MAX_EXP_10 = 347;
+
+// This rescales the base 10 exponent by a factor of log(10)/log(2).
+LIBC_INLINE int32_t exp10_to_exp2(int32_t exp10) {
+  // Valid if exp10 < 646 456 636.
+  return static_cast<int32_t>((217706 * static_cast<int64_t>(exp10)) >> 16);
+}
+
+static constexpr uint64_t DETAILED_POWERS_OF_TEN[696][2] = {
+    {0x1732C869CD60E453, 0xFA8FD5A0081C0288}, // 1e-348
+    {0x0E7FBD42205C8EB4, 0x9C99E58405118195}, // 1e-347
+    {0x521FAC92A873B261, 0xC3C05EE50655E1FA}, // 1e-346
+    {0xE6A797B752909EF9, 0xF4B0769E47EB5A78}, // 1e-345
+    {0x9028BED2939A635C, 0x98EE4A22ECF3188B}, // 1e-344
+    {0x7432EE873880FC33, 0xBF29DCABA82FDEAE}, // 1e-343
+    {0x113FAA2906A13B3F, 0xEEF453D6923BD65A}, // 1e-342
+    {0x4AC7CA59A424C507, 0x9558B4661B6565F8}, // 1e-341
+    {0x5D79BCF00D2DF649, 0xBAAEE17FA23EBF76}, // 1e-340
+    {0xF4D82C2C107973DC, 0xE95A99DF8ACE6F53}, // 1e-339
+    {0x79071B9B8A4BE869, 0x91D8A02BB6C10594}, // 1e-338
+    {0x9748E2826CDEE284, 0xB64EC836A47146F9}, // 1e-337
+    {0xFD1B1B2308169B25, 0xE3E27A444D8D98B7}, // 1e-336
+    {0xFE30F0F5E50E20F7, 0x8E6D8C6AB0787F72}, // 1e-335
+    {0xBDBD2D335E51A935, 0xB208EF855C969F4F}, // 1e-334
+    {0xAD2C788035E61382, 0xDE8B2B66B3BC4723}, // 1e-333
+    {0x4C3BCB5021AFCC31, 0x8B16FB203055AC76}, // 1e-332
+    {0xDF4ABE242A1BBF3D, 0xADDCB9E83C6B1793}, // 1e-331
+    {0xD71D6DAD34A2AF0D, 0xD953E8624B85DD78}, // 1e-330
+    {0x8672648C40E5AD68, 0x87D4713D6F33AA6B}, // 1e-329
+    {0x680EFDAF511F18C2, 0xA9C98D8CCB009506}, // 1e-328
+    {0x0212BD1B2566DEF2, 0xD43BF0EFFDC0BA48}, // 1e-327
+    {0x014BB630F7604B57, 0x84A57695FE98746D}, // 1e-326
+    {0x419EA3BD35385E2D, 0xA5CED43B7E3E9188}, // 1e-325
+    {0x52064CAC828675B9, 0xCF42894A5DCE35EA}, // 1e-324
+    {0x7343EFEBD1940993, 0x818995CE7AA0E1B2}, // 1e-323
+    {0x1014EBE6C5F90BF8, 0xA1EBFB4219491A1F}, // 1e-322
+    {0xD41A26E077774EF6, 0xCA66FA129F9B60A6}, // 1e-321
+    {0x8920B098955522B4, 0xFD00B897478238D0}, // 1e-320
+    {0x55B46E5F5D5535B0, 0x9E20735E8CB16382}, // 1e-319
+    {0xEB2189F734AA831D, 0xC5A890362FDDBC62}, // 1e-318
+    {0xA5E9EC7501D523E4, 0xF712B443BBD52B7B}, // 1e-317
+    {0x47B233C92125366E, 0x9A6BB0AA55653B2D}, // 1e-316
+    {0x999EC0BB696E840A, 0xC1069CD4EABE89F8}, // 1e-315
+    {0xC00670EA43CA250D, 0xF148440A256E2C76}, // 1e-314
+    {0x380406926A5E5728, 0x96CD2A865764DBCA}, // 1e-313
+    {0xC605083704F5ECF2, 0xBC807527ED3E12BC}, // 1e-312
+    {0xF7864A44C633682E, 0xEBA09271E88D976B}, // 1e-311
+    {0x7AB3EE6AFBE0211D, 0x93445B8731587EA3}, // 1e-310
+    {0x5960EA05BAD82964, 0xB8157268FDAE9E4C}, // 1e-309
+    {0x6FB92487298E33BD, 0xE61ACF033D1A45DF}, // 1e-308
+    {0xA5D3B6D479F8E056, 0x8FD0C16206306BAB}, // 1e-307
+    {0x8F48A4899877186C, 0xB3C4F1BA87BC8696}, // 1e-306
+    {0x331ACDABFE94DE87, 0xE0B62E2929ABA83C}, // 1e-305
+    {0x9FF0C08B7F1D0B14, 0x8C71DCD9BA0B4925}, // 1e-304
+    {0x07ECF0AE5EE44DD9, 0xAF8E5410288E1B6F}, // 1e-303
+    {0xC9E82CD9F69D6150, 0xDB71E91432B1A24A}, // 1e-302
+    {0xBE311C083A225CD2, 0x892731AC9FAF056E}, // 1e-301
+    {0x6DBD630A48AAF406, 0xAB70FE17C79AC6CA}, // 1e-300
+    {0x092CBBCCDAD5B108, 0xD64D3D9DB981787D}, // 1e-299
+    {0x25BBF56008C58EA5, 0x85F0468293F0EB4E}, // 1e-298
+    {0xAF2AF2B80AF6F24E, 0xA76C582338ED2621}, // 1e-297
+    {0x1AF5AF660DB4AEE1, 0xD1476E2C07286FAA}, // 1e-296
+    {0x50D98D9FC890ED4D, 0x82CCA4DB847945CA}, // 1e-295
+    {0xE50FF107BAB528A0, 0xA37FCE126597973C}, // 1e-294
+    {0x1E53ED49A96272C8, 0xCC5FC196FEFD7D0C}, // 1e-293
+    {0x25E8E89C13BB0F7A, 0xFF77B1FCBEBCDC4F}, // 1e-292
+    {0x77B191618C54E9AC, 0x9FAACF3DF73609B1}, // 1e-291
+    {0xD59DF5B9EF6A2417, 0xC795830D75038C1D}, // 1e-290
+    {0x4B0573286B44AD1D, 0xF97AE3D0D2446F25}, // 1e-289
+    {0x4EE367F9430AEC32, 0x9BECCE62836AC577}, // 1e-288
+    {0x229C41F793CDA73F, 0xC2E801FB244576D5}, // 1e-287
+    {0x6B43527578C1110F, 0xF3A20279ED56D48A}, // 1e-286
+    {0x830A13896B78AAA9, 0x9845418C345644D6}, // 1e-285
+    {0x23CC986BC656D553, 0xBE5691EF416BD60C}, // 1e-284
+    {0x2CBFBE86B7EC8AA8, 0xEDEC366B11C6CB8F}, // 1e-283
+    {0x7BF7D71432F3D6A9, 0x94B3A202EB1C3F39}, // 1e-282
+    {0xDAF5CCD93FB0CC53, 0xB9E08A83A5E34F07}, // 1e-281
+    {0xD1B3400F8F9CFF68, 0xE858AD248F5C22C9}, // 1e-280
+    {0x23100809B9C21FA1, 0x91376C36D99995BE}, // 1e-279
+    {0xABD40A0C2832A78A, 0xB58547448FFFFB2D}, // 1e-278
+    {0x16C90C8F323F516C, 0xE2E69915B3FFF9F9}, // 1e-277
+    {0xAE3DA7D97F6792E3, 0x8DD01FAD907FFC3B}, // 1e-276
+    {0x99CD11CFDF41779C, 0xB1442798F49FFB4A}, // 1e-275
+    {0x40405643D711D583, 0xDD95317F31C7FA1D}, // 1e-274
+    {0x482835EA666B2572, 0x8A7D3EEF7F1CFC52}, // 1e-273
+    {0xDA3243650005EECF, 0xAD1C8EAB5EE43B66}, // 1e-272
+    {0x90BED43E40076A82, 0xD863B256369D4A40}, // 1e-271
+    {0x5A7744A6E804A291, 0x873E4F75E2224E68}, // 1e-270
+    {0x711515D0A205CB36, 0xA90DE3535AAAE202}, // 1e-269
+    {0x0D5A5B44CA873E03, 0xD3515C2831559A83}, // 1e-268
+    {0xE858790AFE9486C2, 0x8412D9991ED58091}, // 1e-267
+    {0x626E974DBE39A872, 0xA5178FFF668AE0B6}, // 1e-266
+    {0xFB0A3D212DC8128F, 0xCE5D73FF402D98E3}, // 1e-265
+    {0x7CE66634BC9D0B99, 0x80FA687F881C7F8E}, // 1e-264
+    {0x1C1FFFC1EBC44E80, 0xA139029F6A239F72}, // 1e-263
+    {0xA327FFB266B56220, 0xC987434744AC874E}, // 1e-262
+    {0x4BF1FF9F0062BAA8, 0xFBE9141915D7A922}, // 1e-261
+    {0x6F773FC3603DB4A9, 0x9D71AC8FADA6C9B5}, // 1e-260
+    {0xCB550FB4384D21D3, 0xC4CE17B399107C22}, // 1e-259
+    {0x7E2A53A146606A48, 0xF6019DA07F549B2B}, // 1e-258
+    {0x2EDA7444CBFC426D, 0x99C102844F94E0FB}, // 1e-257
+    {0xFA911155FEFB5308, 0xC0314325637A1939}, // 1e-256
+    {0x793555AB7EBA27CA, 0xF03D93EEBC589F88}, // 1e-255
+    {0x4BC1558B2F3458DE, 0x96267C7535B763B5}, // 1e-254
+    {0x9EB1AAEDFB016F16, 0xBBB01B9283253CA2}, // 1e-253
+    {0x465E15A979C1CADC, 0xEA9C227723EE8BCB}, // 1e-252
+    {0x0BFACD89EC191EC9, 0x92A1958A7675175F}, // 1e-251
+    {0xCEF980EC671F667B, 0xB749FAED14125D36}, // 1e-250
+    {0x82B7E12780E7401A, 0xE51C79A85916F484}, // 1e-249
+    {0xD1B2ECB8B0908810, 0x8F31CC0937AE58D2}, // 1e-248
+    {0x861FA7E6DCB4AA15, 0xB2FE3F0B8599EF07}, // 1e-247
+    {0x67A791E093E1D49A, 0xDFBDCECE67006AC9}, // 1e-246
+    {0xE0C8BB2C5C6D24E0, 0x8BD6A141006042BD}, // 1e-245
+    {0x58FAE9F773886E18, 0xAECC49914078536D}, // 1e-244
+    {0xAF39A475506A899E, 0xDA7F5BF590966848}, // 1e-243
+    {0x6D8406C952429603, 0x888F99797A5E012D}, // 1e-242
+    {0xC8E5087BA6D33B83, 0xAAB37FD7D8F58178}, // 1e-241
+    {0xFB1E4A9A90880A64, 0xD5605FCDCF32E1D6}, // 1e-240
+    {0x5CF2EEA09A55067F, 0x855C3BE0A17FCD26}, // 1e-239
+    {0xF42FAA48C0EA481E, 0xA6B34AD8C9DFC06F}, // 1e-238
+    {0xF13B94DAF124DA26, 0xD0601D8EFC57B08B}, // 1e-237
+    {0x76C53D08D6B70858, 0x823C12795DB6CE57}, // 1e-236
+    {0x54768C4B0C64CA6E, 0xA2CB1717B52481ED}, // 1e-235
+    {0xA9942F5DCF7DFD09, 0xCB7DDCDDA26DA268}, // 1e-234
+    {0xD3F93B35435D7C4C, 0xFE5D54150B090B02}, // 1e-233
+    {0xC47BC5014A1A6DAF, 0x9EFA548D26E5A6E1}, // 1e-232
+    {0x359AB6419CA1091B, 0xC6B8E9B0709F109A}, // 1e-231
+    {0xC30163D203C94B62, 0xF867241C8CC6D4C0}, // 1e-230
+    {0x79E0DE63425DCF1D, 0x9B407691D7FC44F8}, // 1e-229
+    {0x985915FC12F542E4, 0xC21094364DFB5636}, // 1e-228
+    {0x3E6F5B7B17B2939D, 0xF294B943E17A2BC4}, // 1e-227
+    {0xA705992CEECF9C42, 0x979CF3CA6CEC5B5A}, // 1e-226
+    {0x50C6FF782A838353, 0xBD8430BD08277231}, // 1e-225
+    {0xA4F8BF5635246428, 0xECE53CEC4A314EBD}, // 1e-224
+    {0x871B7795E136BE99, 0x940F4613AE5ED136}, // 1e-223
+    {0x28E2557B59846E3F, 0xB913179899F68584}, // 1e-222
+    {0x331AEADA2FE589CF, 0xE757DD7EC07426E5}, // 1e-221
+    {0x3FF0D2C85DEF7621, 0x9096EA6F3848984F}, // 1e-220
+    {0x0FED077A756B53A9, 0xB4BCA50B065ABE63}, // 1e-219
+    {0xD3E8495912C62894, 0xE1EBCE4DC7F16DFB}, // 1e-218
+    {0x64712DD7ABBBD95C, 0x8D3360F09CF6E4BD}, // 1e-217
+    {0xBD8D794D96AACFB3, 0xB080392CC4349DEC}, // 1e-216
+    {0xECF0D7A0FC5583A0, 0xDCA04777F541C567}, // 1e-215
+    {0xF41686C49DB57244, 0x89E42CAAF9491B60}, // 1e-214
+    {0x311C2875C522CED5, 0xAC5D37D5B79B6239}, // 1e-213
+    {0x7D633293366B828B, 0xD77485CB25823AC7}, // 1e-212
+    {0xAE5DFF9C02033197, 0x86A8D39EF77164BC}, // 1e-211
+    {0xD9F57F830283FDFC, 0xA8530886B54DBDEB}, // 1e-210
+    {0xD072DF63C324FD7B, 0xD267CAA862A12D66}, // 1e-209
+    {0x4247CB9E59F71E6D, 0x8380DEA93DA4BC60}, // 1e-208
+    {0x52D9BE85F074E608, 0xA46116538D0DEB78}, // 1e-207
+    {0x67902E276C921F8B, 0xCD795BE870516656}, // 1e-206
+    {0x00BA1CD8A3DB53B6, 0x806BD9714632DFF6}, // 1e-205
+    {0x80E8A40ECCD228A4, 0xA086CFCD97BF97F3}, // 1e-204
+    {0x6122CD128006B2CD, 0xC8A883C0FDAF7DF0}, // 1e-203
+    {0x796B805720085F81, 0xFAD2A4B13D1B5D6C}, // 1e-202
+    {0xCBE3303674053BB0, 0x9CC3A6EEC6311A63}, // 1e-201
+    {0xBEDBFC4411068A9C, 0xC3F490AA77BD60FC}, // 1e-200
+    {0xEE92FB5515482D44, 0xF4F1B4D515ACB93B}, // 1e-199
+    {0x751BDD152D4D1C4A, 0x991711052D8BF3C5}, // 1e-198
+    {0xD262D45A78A0635D, 0xBF5CD54678EEF0B6}, // 1e-197
+    {0x86FB897116C87C34, 0xEF340A98172AACE4}, // 1e-196
+    {0xD45D35E6AE3D4DA0, 0x9580869F0E7AAC0E}, // 1e-195
+    {0x8974836059CCA109, 0xBAE0A846D2195712}, // 1e-194
+    {0x2BD1A438703FC94B, 0xE998D258869FACD7}, // 1e-193
+    {0x7B6306A34627DDCF, 0x91FF83775423CC06}, // 1e-192
+    {0x1A3BC84C17B1D542, 0xB67F6455292CBF08}, // 1e-191
+    {0x20CABA5F1D9E4A93, 0xE41F3D6A7377EECA}, // 1e-190
+    {0x547EB47B7282EE9C, 0x8E938662882AF53E}, // 1e-189
+    {0xE99E619A4F23AA43, 0xB23867FB2A35B28D}, // 1e-188
+    {0x6405FA00E2EC94D4, 0xDEC681F9F4C31F31}, // 1e-187
+    {0xDE83BC408DD3DD04, 0x8B3C113C38F9F37E}, // 1e-186
+    {0x9624AB50B148D445, 0xAE0B158B4738705E}, // 1e-185
+    {0x3BADD624DD9B0957, 0xD98DDAEE19068C76}, // 1e-184
+    {0xE54CA5D70A80E5D6, 0x87F8A8D4CFA417C9}, // 1e-183
+    {0x5E9FCF4CCD211F4C, 0xA9F6D30A038D1DBC}, // 1e-182
+    {0x7647C3200069671F, 0xD47487CC8470652B}, // 1e-181
+    {0x29ECD9F40041E073, 0x84C8D4DFD2C63F3B}, // 1e-180
+    {0xF468107100525890, 0xA5FB0A17C777CF09}, // 1e-179
+    {0x7182148D4066EEB4, 0xCF79CC9DB955C2CC}, // 1e-178
+    {0xC6F14CD848405530, 0x81AC1FE293D599BF}, // 1e-177
+    {0xB8ADA00E5A506A7C, 0xA21727DB38CB002F}, // 1e-176
+    {0xA6D90811F0E4851C, 0xCA9CF1D206FDC03B}, // 1e-175
+    {0x908F4A166D1DA663, 0xFD442E4688BD304A}, // 1e-174
+    {0x9A598E4E043287FE, 0x9E4A9CEC15763E2E}, // 1e-173
+    {0x40EFF1E1853F29FD, 0xC5DD44271AD3CDBA}, // 1e-172
+    {0xD12BEE59E68EF47C, 0xF7549530E188C128}, // 1e-171
+    {0x82BB74F8301958CE, 0x9A94DD3E8CF578B9}, // 1e-170
+    {0xE36A52363C1FAF01, 0xC13A148E3032D6E7}, // 1e-169
+    {0xDC44E6C3CB279AC1, 0xF18899B1BC3F8CA1}, // 1e-168
+    {0x29AB103A5EF8C0B9, 0x96F5600F15A7B7E5}, // 1e-167
+    {0x7415D448F6B6F0E7, 0xBCB2B812DB11A5DE}, // 1e-166
+    {0x111B495B3464AD21, 0xEBDF661791D60F56}, // 1e-165
+    {0xCAB10DD900BEEC34, 0x936B9FCEBB25C995}, // 1e-164
+    {0x3D5D514F40EEA742, 0xB84687C269EF3BFB}, // 1e-163
+    {0x0CB4A5A3112A5112, 0xE65829B3046B0AFA}, // 1e-162
+    {0x47F0E785EABA72AB, 0x8FF71A0FE2C2E6DC}, // 1e-161
+    {0x59ED216765690F56, 0xB3F4E093DB73A093}, // 1e-160
+    {0x306869C13EC3532C, 0xE0F218B8D25088B8}, // 1e-159
+    {0x1E414218C73A13FB, 0x8C974F7383725573}, // 1e-158
+    {0xE5D1929EF90898FA, 0xAFBD2350644EEACF}, // 1e-157
+    {0xDF45F746B74ABF39, 0xDBAC6C247D62A583}, // 1e-156
+    {0x6B8BBA8C328EB783, 0x894BC396CE5DA772}, // 1e-155
+    {0x066EA92F3F326564, 0xAB9EB47C81F5114F}, // 1e-154
+    {0xC80A537B0EFEFEBD, 0xD686619BA27255A2}, // 1e-153
+    {0xBD06742CE95F5F36, 0x8613FD0145877585}, // 1e-152
+    {0x2C48113823B73704, 0xA798FC4196E952E7}, // 1e-151
+    {0xF75A15862CA504C5, 0xD17F3B51FCA3A7A0}, // 1e-150
+    {0x9A984D73DBE722FB, 0x82EF85133DE648C4}, // 1e-149
+    {0xC13E60D0D2E0EBBA, 0xA3AB66580D5FDAF5}, // 1e-148
+    {0x318DF905079926A8, 0xCC963FEE10B7D1B3}, // 1e-147
+    {0xFDF17746497F7052, 0xFFBBCFE994E5C61F}, // 1e-146
+    {0xFEB6EA8BEDEFA633, 0x9FD561F1FD0F9BD3}, // 1e-145
+    {0xFE64A52EE96B8FC0, 0xC7CABA6E7C5382C8}, // 1e-144
+    {0x3DFDCE7AA3C673B0, 0xF9BD690A1B68637B}, // 1e-143
+    {0x06BEA10CA65C084E, 0x9C1661A651213E2D}, // 1e-142
+    {0x486E494FCFF30A62, 0xC31BFA0FE5698DB8}, // 1e-141
+    {0x5A89DBA3C3EFCCFA, 0xF3E2F893DEC3F126}, // 1e-140
+    {0xF89629465A75E01C, 0x986DDB5C6B3A76B7}, // 1e-139
+    {0xF6BBB397F1135823, 0xBE89523386091465}, // 1e-138
+    {0x746AA07DED582E2C, 0xEE2BA6C0678B597F}, // 1e-137
+    {0xA8C2A44EB4571CDC, 0x94DB483840B717EF}, // 1e-136
+    {0x92F34D62616CE413, 0xBA121A4650E4DDEB}, // 1e-135
+    {0x77B020BAF9C81D17, 0xE896A0D7E51E1566}, // 1e-134
+    {0x0ACE1474DC1D122E, 0x915E2486EF32CD60}, // 1e-133
+    {0x0D819992132456BA, 0xB5B5ADA8AAFF80B8}, // 1e-132
+    {0x10E1FFF697ED6C69, 0xE3231912D5BF60E6}, // 1e-131
+    {0xCA8D3FFA1EF463C1, 0x8DF5EFABC5979C8F}, // 1e-130
+    {0xBD308FF8A6B17CB2, 0xB1736B96B6FD83B3}, // 1e-129
+    {0xAC7CB3F6D05DDBDE, 0xDDD0467C64BCE4A0}, // 1e-128
+    {0x6BCDF07A423AA96B, 0x8AA22C0DBEF60EE4}, // 1e-127
+    {0x86C16C98D2C953C6, 0xAD4AB7112EB3929D}, // 1e-126
+    {0xE871C7BF077BA8B7, 0xD89D64D57A607744}, // 1e-125
+    {0x11471CD764AD4972, 0x87625F056C7C4A8B}, // 1e-124
+    {0xD598E40D3DD89BCF, 0xA93AF6C6C79B5D2D}, // 1e-123
+    {0x4AFF1D108D4EC2C3, 0xD389B47879823479}, // 1e-122
+    {0xCEDF722A585139BA, 0x843610CB4BF160CB}, // 1e-121
+    {0xC2974EB4EE658828, 0xA54394FE1EEDB8FE}, // 1e-120
+    {0x733D226229FEEA32, 0xCE947A3DA6A9273E}, // 1e-119
+    {0x0806357D5A3F525F, 0x811CCC668829B887}, // 1e-118
+    {0xCA07C2DCB0CF26F7, 0xA163FF802A3426A8}, // 1e-117
+    {0xFC89B393DD02F0B5, 0xC9BCFF6034C13052}, // 1e-116
+    {0xBBAC2078D443ACE2, 0xFC2C3F3841F17C67}, // 1e-115
+    {0xD54B944B84AA4C0D, 0x9D9BA7832936EDC0}, // 1e-114
+    {0x0A9E795E65D4DF11, 0xC5029163F384A931}, // 1e-113
+    {0x4D4617B5FF4A16D5, 0xF64335BCF065D37D}, // 1e-112
+    {0x504BCED1BF8E4E45, 0x99EA0196163FA42E}, // 1e-111
+    {0xE45EC2862F71E1D6, 0xC06481FB9BCF8D39}, // 1e-110
+    {0x5D767327BB4E5A4C, 0xF07DA27A82C37088}, // 1e-109
+    {0x3A6A07F8D510F86F, 0x964E858C91BA2655}, // 1e-108
+    {0x890489F70A55368B, 0xBBE226EFB628AFEA}, // 1e-107
+    {0x2B45AC74CCEA842E, 0xEADAB0ABA3B2DBE5}, // 1e-106
+    {0x3B0B8BC90012929D, 0x92C8AE6B464FC96F}, // 1e-105
+    {0x09CE6EBB40173744, 0xB77ADA0617E3BBCB}, // 1e-104
+    {0xCC420A6A101D0515, 0xE55990879DDCAABD}, // 1e-103
+    {0x9FA946824A12232D, 0x8F57FA54C2A9EAB6}, // 1e-102
+    {0x47939822DC96ABF9, 0xB32DF8E9F3546564}, // 1e-101
+    {0x59787E2B93BC56F7, 0xDFF9772470297EBD}, // 1e-100
+    {0x57EB4EDB3C55B65A, 0x8BFBEA76C619EF36}, // 1e-99
+    {0xEDE622920B6B23F1, 0xAEFAE51477A06B03}, // 1e-98
+    {0xE95FAB368E45ECED, 0xDAB99E59958885C4}, // 1e-97
+    {0x11DBCB0218EBB414, 0x88B402F7FD75539B}, // 1e-96
+    {0xD652BDC29F26A119, 0xAAE103B5FCD2A881}, // 1e-95
+    {0x4BE76D3346F0495F, 0xD59944A37C0752A2}, // 1e-94
+    {0x6F70A4400C562DDB, 0x857FCAE62D8493A5}, // 1e-93
+    {0xCB4CCD500F6BB952, 0xA6DFBD9FB8E5B88E}, // 1e-92
+    {0x7E2000A41346A7A7, 0xD097AD07A71F26B2}, // 1e-91
+    {0x8ED400668C0C28C8, 0x825ECC24C873782F}, // 1e-90
+    {0x728900802F0F32FA, 0xA2F67F2DFA90563B}, // 1e-89
+    {0x4F2B40A03AD2FFB9, 0xCBB41EF979346BCA}, // 1e-88
+    {0xE2F610C84987BFA8, 0xFEA126B7D78186BC}, // 1e-87
+    {0x0DD9CA7D2DF4D7C9, 0x9F24B832E6B0F436}, // 1e-86
+    {0x91503D1C79720DBB, 0xC6EDE63FA05D3143}, // 1e-85
+    {0x75A44C6397CE912A, 0xF8A95FCF88747D94}, // 1e-84
+    {0xC986AFBE3EE11ABA, 0x9B69DBE1B548CE7C}, // 1e-83
+    {0xFBE85BADCE996168, 0xC24452DA229B021B}, // 1e-82
+    {0xFAE27299423FB9C3, 0xF2D56790AB41C2A2}, // 1e-81
+    {0xDCCD879FC967D41A, 0x97C560BA6B0919A5}, // 1e-80
+    {0x5400E987BBC1C920, 0xBDB6B8E905CB600F}, // 1e-79
+    {0x290123E9AAB23B68, 0xED246723473E3813}, // 1e-78
+    {0xF9A0B6720AAF6521, 0x9436C0760C86E30B}, // 1e-77
+    {0xF808E40E8D5B3E69, 0xB94470938FA89BCE}, // 1e-76
+    {0xB60B1D1230B20E04, 0xE7958CB87392C2C2}, // 1e-75
+    {0xB1C6F22B5E6F48C2, 0x90BD77F3483BB9B9}, // 1e-74
+    {0x1E38AEB6360B1AF3, 0xB4ECD5F01A4AA828}, // 1e-73
+    {0x25C6DA63C38DE1B0, 0xE2280B6C20DD5232}, // 1e-72
+    {0x579C487E5A38AD0E, 0x8D590723948A535F}, // 1e-71
+    {0x2D835A9DF0C6D851, 0xB0AF48EC79ACE837}, // 1e-70
+    {0xF8E431456CF88E65, 0xDCDB1B2798182244}, // 1e-69
+    {0x1B8E9ECB641B58FF, 0x8A08F0F8BF0F156B}, // 1e-68
+    {0xE272467E3D222F3F, 0xAC8B2D36EED2DAC5}, // 1e-67
+    {0x5B0ED81DCC6ABB0F, 0xD7ADF884AA879177}, // 1e-66
+    {0x98E947129FC2B4E9, 0x86CCBB52EA94BAEA}, // 1e-65
+    {0x3F2398D747B36224, 0xA87FEA27A539E9A5}, // 1e-64
+    {0x8EEC7F0D19A03AAD, 0xD29FE4B18E88640E}, // 1e-63
+    {0x1953CF68300424AC, 0x83A3EEEEF9153E89}, // 1e-62
+    {0x5FA8C3423C052DD7, 0xA48CEAAAB75A8E2B}, // 1e-61
+    {0x3792F412CB06794D, 0xCDB02555653131B6}, // 1e-60
+    {0xE2BBD88BBEE40BD0, 0x808E17555F3EBF11}, // 1e-59
+    {0x5B6ACEAEAE9D0EC4, 0xA0B19D2AB70E6ED6}, // 1e-58
+    {0xF245825A5A445275, 0xC8DE047564D20A8B}, // 1e-57
+    {0xEED6E2F0F0D56712, 0xFB158592BE068D2E}, // 1e-56
+    {0x55464DD69685606B, 0x9CED737BB6C4183D}, // 1e-55
+    {0xAA97E14C3C26B886, 0xC428D05AA4751E4C}, // 1e-54
+    {0xD53DD99F4B3066A8, 0xF53304714D9265DF}, // 1e-53
+    {0xE546A8038EFE4029, 0x993FE2C6D07B7FAB}, // 1e-52
+    {0xDE98520472BDD033, 0xBF8FDB78849A5F96}, // 1e-51
+    {0x963E66858F6D4440, 0xEF73D256A5C0F77C}, // 1e-50
+    {0xDDE7001379A44AA8, 0x95A8637627989AAD}, // 1e-49
+    {0x5560C018580D5D52, 0xBB127C53B17EC159}, // 1e-48
+    {0xAAB8F01E6E10B4A6, 0xE9D71B689DDE71AF}, // 1e-47
+    {0xCAB3961304CA70E8, 0x9226712162AB070D}, // 1e-46
+    {0x3D607B97C5FD0D22, 0xB6B00D69BB55C8D1}, // 1e-45
+    {0x8CB89A7DB77C506A, 0xE45C10C42A2B3B05}, // 1e-44
+    {0x77F3608E92ADB242, 0x8EB98A7A9A5B04E3}, // 1e-43
+    {0x55F038B237591ED3, 0xB267ED1940F1C61C}, // 1e-42
+    {0x6B6C46DEC52F6688, 0xDF01E85F912E37A3}, // 1e-41
+    {0x2323AC4B3B3DA015, 0x8B61313BBABCE2C6}, // 1e-40
+    {0xABEC975E0A0D081A, 0xAE397D8AA96C1B77}, // 1e-39
+    {0x96E7BD358C904A21, 0xD9C7DCED53C72255}, // 1e-38
+    {0x7E50D64177DA2E54, 0x881CEA14545C7575}, // 1e-37
+    {0xDDE50BD1D5D0B9E9, 0xAA242499697392D2}, // 1e-36
+    {0x955E4EC64B44E864, 0xD4AD2DBFC3D07787}, // 1e-35
+    {0xBD5AF13BEF0B113E, 0x84EC3C97DA624AB4}, // 1e-34
+    {0xECB1AD8AEACDD58E, 0xA6274BBDD0FADD61}, // 1e-33
+    {0x67DE18EDA5814AF2, 0xCFB11EAD453994BA}, // 1e-32
+    {0x80EACF948770CED7, 0x81CEB32C4B43FCF4}, // 1e-31
+    {0xA1258379A94D028D, 0xA2425FF75E14FC31}, // 1e-30
+    {0x096EE45813A04330, 0xCAD2F7F5359A3B3E}, // 1e-29
+    {0x8BCA9D6E188853FC, 0xFD87B5F28300CA0D}, // 1e-28
+    {0x775EA264CF55347D, 0x9E74D1B791E07E48}, // 1e-27
+    {0x95364AFE032A819D, 0xC612062576589DDA}, // 1e-26
+    {0x3A83DDBD83F52204, 0xF79687AED3EEC551}, // 1e-25
+    {0xC4926A9672793542, 0x9ABE14CD44753B52}, // 1e-24
+    {0x75B7053C0F178293, 0xC16D9A0095928A27}, // 1e-23
+    {0x5324C68B12DD6338, 0xF1C90080BAF72CB1}, // 1e-22
+    {0xD3F6FC16EBCA5E03, 0x971DA05074DA7BEE}, // 1e-21
+    {0x88F4BB1CA6BCF584, 0xBCE5086492111AEA}, // 1e-20
+    {0x2B31E9E3D06C32E5, 0xEC1E4A7DB69561A5}, // 1e-19
+    {0x3AFF322E62439FCF, 0x9392EE8E921D5D07}, // 1e-18
+    {0x09BEFEB9FAD487C2, 0xB877AA3236A4B449}, // 1e-17
+    {0x4C2EBE687989A9B3, 0xE69594BEC44DE15B}, // 1e-16
+    {0x0F9D37014BF60A10, 0x901D7CF73AB0ACD9}, // 1e-15
+    {0x538484C19EF38C94, 0xB424DC35095CD80F}, // 1e-14
+    {0x2865A5F206B06FB9, 0xE12E13424BB40E13}, // 1e-13
+    {0xF93F87B7442E45D3, 0x8CBCCC096F5088CB}, // 1e-12
+    {0xF78F69A51539D748, 0xAFEBFF0BCB24AAFE}, // 1e-11
+    {0xB573440E5A884D1B, 0xDBE6FECEBDEDD5BE}, // 1e-10
+    {0x31680A88F8953030, 0x89705F4136B4A597}, // 1e-9
+    {0xFDC20D2B36BA7C3D, 0xABCC77118461CEFC}, // 1e-8
+    {0x3D32907604691B4C, 0xD6BF94D5E57A42BC}, // 1e-7
+    {0xA63F9A49C2C1B10F, 0x8637BD05AF6C69B5}, // 1e-6
+    {0x0FCF80DC33721D53, 0xA7C5AC471B478423}, // 1e-5
+    {0xD3C36113404EA4A8, 0xD1B71758E219652B}, // 1e-4
+    {0x645A1CAC083126E9, 0x83126E978D4FDF3B}, // 1e-3
+    {0x3D70A3D70A3D70A3, 0xA3D70A3D70A3D70A}, // 1e-2
+    {0xCCCCCCCCCCCCCCCC, 0xCCCCCCCCCCCCCCCC}, // 1e-1
+    {0x0000000000000000, 0x8000000000000000}, // 1e0
+    {0x0000000000000000, 0xA000000000000000}, // 1e1
+    {0x0000000000000000, 0xC800000000000000}, // 1e2
+    {0x0000000000000000, 0xFA00000000000000}, // 1e3
+    {0x0000000000000000, 0x9C40000000000000}, // 1e4
+    {0x0000000000000000, 0xC350000000000000}, // 1e5
+    {0x0000000000000000, 0xF424000000000000}, // 1e6
+    {0x0000000000000000, 0x9896800000000000}, // 1e7
+    {0x0000000000000000, 0xBEBC200000000000}, // 1e8
+    {0x0000000000000000, 0xEE6B280000000000}, // 1e9
+    {0x0000000000000000, 0x9502F90000000000}, // 1e10
+    {0x0000000000000000, 0xBA43B74000000000}, // 1e11
+    {0x0000000000000000, 0xE8D4A51000000000}, // 1e12
+    {0x0000000000000000, 0x9184E72A00000000}, // 1e13
+    {0x0000000000000000, 0xB5E620F480000000}, // 1e14
+    {0x0000000000000000, 0xE35FA931A0000000}, // 1e15
+    {0x0000000000000000, 0x8E1BC9BF04000000}, // 1e16
+    {0x0000000000000000, 0xB1A2BC2EC5000000}, // 1e17
+    {0x0000000000000000, 0xDE0B6B3A76400000}, // 1e18
+    {0x0000000000000000, 0x8AC7230489E80000}, // 1e19
+    {0x0000000000000000, 0xAD78EBC5AC620000}, // 1e20
+    {0x0000000000000000, 0xD8D726B7177A8000}, // 1e21
+    {0x0000000000000000, 0x878678326EAC9000}, // 1e22
+    {0x0000000000000000, 0xA968163F0A57B400}, // 1e23
+    {0x0000000000000000, 0xD3C21BCECCEDA100}, // 1e24
+    {0x0000000000000000, 0x84595161401484A0}, // 1e25
+    {0x0000000000000000, 0xA56FA5B99019A5C8}, // 1e26
+    {0x0000000000000000, 0xCECB8F27F4200F3A}, // 1e27
+    {0x4000000000000000, 0x813F3978F8940984}, // 1e28
+    {0x5000000000000000, 0xA18F07D736B90BE5}, // 1e29
+    {0xA400000000000000, 0xC9F2C9CD04674EDE}, // 1e30
+    {0x4D00000000000000, 0xFC6F7C4045812296}, // 1e31
+    {0xF020000000000000, 0x9DC5ADA82B70B59D}, // 1e32
+    {0x6C28000000000000, 0xC5371912364CE305}, // 1e33
+    {0xC732000000000000, 0xF684DF56C3E01BC6}, // 1e34
+    {0x3C7F400000000000, 0x9A130B963A6C115C}, // 1e35
+    {0x4B9F100000000000, 0xC097CE7BC90715B3}, // 1e36
+    {0x1E86D40000000000, 0xF0BDC21ABB48DB20}, // 1e37
+    {0x1314448000000000, 0x96769950B50D88F4}, // 1e38
+    {0x17D955A000000000, 0xBC143FA4E250EB31}, // 1e39
+    {0x5DCFAB0800000000, 0xEB194F8E1AE525FD}, // 1e40
+    {0x5AA1CAE500000000, 0x92EFD1B8D0CF37BE}, // 1e41
+    {0xF14A3D9E40000000, 0xB7ABC627050305AD}, // 1e42
+    {0x6D9CCD05D0000000, 0xE596B7B0C643C719}, // 1e43
+    {0xE4820023A2000000, 0x8F7E32CE7BEA5C6F}, // 1e44
+    {0xDDA2802C8A800000, 0xB35DBF821AE4F38B}, // 1e45
+    {0xD50B2037AD200000, 0xE0352F62A19E306E}, // 1e46
+    {0x4526F422CC340000, 0x8C213D9DA502DE45}, // 1e47
+    {0x9670B12B7F410000, 0xAF298D050E4395D6}, // 1e48
+    {0x3C0CDD765F114000, 0xDAF3F04651D47B4C}, // 1e49
+    {0xA5880A69FB6AC800, 0x88D8762BF324CD0F}, // 1e50
+    {0x8EEA0D047A457A00, 0xAB0E93B6EFEE0053}, // 1e51
+    {0x72A4904598D6D880, 0xD5D238A4ABE98068}, // 1e52
+    {0x47A6DA2B7F864750, 0x85A36366EB71F041}, // 1e53
+    {0x999090B65F67D924, 0xA70C3C40A64E6C51}, // 1e54
+    {0xFFF4B4E3F741CF6D, 0xD0CF4B50CFE20765}, // 1e55
+    {0xBFF8F10E7A8921A4, 0x82818F1281ED449F}, // 1e56
+    {0xAFF72D52192B6A0D, 0xA321F2D7226895C7}, // 1e57
+    {0x9BF4F8A69F764490, 0xCBEA6F8CEB02BB39}, // 1e58
+    {0x02F236D04753D5B4, 0xFEE50B7025C36A08}, // 1e59
+    {0x01D762422C946590, 0x9F4F2726179A2245}, // 1e60
+    {0x424D3AD2B7B97EF5, 0xC722F0EF9D80AAD6}, // 1e61
+    {0xD2E0898765A7DEB2, 0xF8EBAD2B84E0D58B}, // 1e62
+    {0x63CC55F49F88EB2F, 0x9B934C3B330C8577}, // 1e63
+    {0x3CBF6B71C76B25FB, 0xC2781F49FFCFA6D5}, // 1e64
+    {0x8BEF464E3945EF7A, 0xF316271C7FC3908A}, // 1e65
+    {0x97758BF0E3CBB5AC, 0x97EDD871CFDA3A56}, // 1e66
+    {0x3D52EEED1CBEA317, 0xBDE94E8E43D0C8EC}, // 1e67
+    {0x4CA7AAA863EE4BDD, 0xED63A231D4C4FB27}, // 1e68
+    {0x8FE8CAA93E74EF6A, 0x945E455F24FB1CF8}, // 1e69
+    {0xB3E2FD538E122B44, 0xB975D6B6EE39E436}, // 1e70
+    {0x60DBBCA87196B616, 0xE7D34C64A9C85D44}, // 1e71
+    {0xBC8955E946FE31CD, 0x90E40FBEEA1D3A4A}, // 1e72
+    {0x6BABAB6398BDBE41, 0xB51D13AEA4A488DD}, // 1e73
+    {0xC696963C7EED2DD1, 0xE264589A4DCDAB14}, // 1e74
+    {0xFC1E1DE5CF543CA2, 0x8D7EB76070A08AEC}, // 1e75
+    {0x3B25A55F43294BCB, 0xB0DE65388CC8ADA8}, // 1e76
+    {0x49EF0EB713F39EBE, 0xDD15FE86AFFAD912}, // 1e77
+    {0x6E3569326C784337, 0x8A2DBF142DFCC7AB}, // 1e78
+    {0x49C2C37F07965404, 0xACB92ED9397BF996}, // 1e79
+    {0xDC33745EC97BE906, 0xD7E77A8F87DAF7FB}, // 1e80
+    {0x69A028BB3DED71A3, 0x86F0AC99B4E8DAFD}, // 1e81
+    {0xC40832EA0D68CE0C, 0xA8ACD7C0222311BC}, // 1e82
+    {0xF50A3FA490C30190, 0xD2D80DB02AABD62B}, // 1e83
+    {0x792667C6DA79E0FA, 0x83C7088E1AAB65DB}, // 1e84
+    {0x577001B891185938, 0xA4B8CAB1A1563F52}, // 1e85
+    {0xED4C0226B55E6F86, 0xCDE6FD5E09ABCF26}, // 1e86
+    {0x544F8158315B05B4, 0x80B05E5AC60B6178}, // 1e87
+    {0x696361AE3DB1C721, 0xA0DC75F1778E39D6}, // 1e88
+    {0x03BC3A19CD1E38E9, 0xC913936DD571C84C}, // 1e89
+    {0x04AB48A04065C723, 0xFB5878494ACE3A5F}, // 1e90
+    {0x62EB0D64283F9C76, 0x9D174B2DCEC0E47B}, // 1e91
+    {0x3BA5D0BD324F8394, 0xC45D1DF942711D9A}, // 1e92
+    {0xCA8F44EC7EE36479, 0xF5746577930D6500}, // 1e93
+    {0x7E998B13CF4E1ECB, 0x9968BF6ABBE85F20}, // 1e94
+    {0x9E3FEDD8C321A67E, 0xBFC2EF456AE276E8}, // 1e95
+    {0xC5CFE94EF3EA101E, 0xEFB3AB16C59B14A2}, // 1e96
+    {0xBBA1F1D158724A12, 0x95D04AEE3B80ECE5}, // 1e97
+    {0x2A8A6E45AE8EDC97, 0xBB445DA9CA61281F}, // 1e98
+    {0xF52D09D71A3293BD, 0xEA1575143CF97226}, // 1e99
+    {0x593C2626705F9C56, 0x924D692CA61BE758}, // 1e100
+    {0x6F8B2FB00C77836C, 0xB6E0C377CFA2E12E}, // 1e101
+    {0x0B6DFB9C0F956447, 0xE498F455C38B997A}, // 1e102
+    {0x4724BD4189BD5EAC, 0x8EDF98B59A373FEC}, // 1e103
+    {0x58EDEC91EC2CB657, 0xB2977EE300C50FE7}, // 1e104
+    {0x2F2967B66737E3ED, 0xDF3D5E9BC0F653E1}, // 1e105
+    {0xBD79E0D20082EE74, 0x8B865B215899F46C}, // 1e106
+    {0xECD8590680A3AA11, 0xAE67F1E9AEC07187}, // 1e107
+    {0xE80E6F4820CC9495, 0xDA01EE641A708DE9}, // 1e108
+    {0x3109058D147FDCDD, 0x884134FE908658B2}, // 1e109
+    {0xBD4B46F0599FD415, 0xAA51823E34A7EEDE}, // 1e110
+    {0x6C9E18AC7007C91A, 0xD4E5E2CDC1D1EA96}, // 1e111
+    {0x03E2CF6BC604DDB0, 0x850FADC09923329E}, // 1e112
+    {0x84DB8346B786151C, 0xA6539930BF6BFF45}, // 1e113
+    {0xE612641865679A63, 0xCFE87F7CEF46FF16}, // 1e114
+    {0x4FCB7E8F3F60C07E, 0x81F14FAE158C5F6E}, // 1e115
+    {0xE3BE5E330F38F09D, 0xA26DA3999AEF7749}, // 1e116
+    {0x5CADF5BFD3072CC5, 0xCB090C8001AB551C}, // 1e117
+    {0x73D9732FC7C8F7F6, 0xFDCB4FA002162A63}, // 1e118
+    {0x2867E7FDDCDD9AFA, 0x9E9F11C4014DDA7E}, // 1e119
+    {0xB281E1FD541501B8, 0xC646D63501A1511D}, // 1e120
+    {0x1F225A7CA91A4226, 0xF7D88BC24209A565}, // 1e121
+    {0x3375788DE9B06958, 0x9AE757596946075F}, // 1e122
+    {0x0052D6B1641C83AE, 0xC1A12D2FC3978937}, // 1e123
+    {0xC0678C5DBD23A49A, 0xF209787BB47D6B84}, // 1e124
+    {0xF840B7BA963646E0, 0x9745EB4D50CE6332}, // 1e125
+    {0xB650E5A93BC3D898, 0xBD176620A501FBFF}, // 1e126
+    {0xA3E51F138AB4CEBE, 0xEC5D3FA8CE427AFF}, // 1e127
+    {0xC66F336C36B10137, 0x93BA47C980E98CDF}, // 1e128
+    {0xB80B0047445D4184, 0xB8A8D9BBE123F017}, // 1e129
+    {0xA60DC059157491E5, 0xE6D3102AD96CEC1D}, // 1e130
+    {0x87C89837AD68DB2F, 0x9043EA1AC7E41392}, // 1e131
+    {0x29BABE4598C311FB, 0xB454E4A179DD1877}, // 1e132
+    {0xF4296DD6FEF3D67A, 0xE16A1DC9D8545E94}, // 1e133
+    {0x1899E4A65F58660C, 0x8CE2529E2734BB1D}, // 1e134
+    {0x5EC05DCFF72E7F8F, 0xB01AE745B101E9E4}, // 1e135
+    {0x76707543F4FA1F73, 0xDC21A1171D42645D}, // 1e136
+    {0x6A06494A791C53A8, 0x899504AE72497EBA}, // 1e137
+    {0x0487DB9D17636892, 0xABFA45DA0EDBDE69}, // 1e138
+    {0x45A9D2845D3C42B6, 0xD6F8D7509292D603}, // 1e139
+    {0x0B8A2392BA45A9B2, 0x865B86925B9BC5C2}, // 1e140
+    {0x8E6CAC7768D7141E, 0xA7F26836F282B732}, // 1e141
+    {0x3207D795430CD926, 0xD1EF0244AF2364FF}, // 1e142
+    {0x7F44E6BD49E807B8, 0x8335616AED761F1F}, // 1e143
+    {0x5F16206C9C6209A6, 0xA402B9C5A8D3A6E7}, // 1e144
+    {0x36DBA887C37A8C0F, 0xCD036837130890A1}, // 1e145
+    {0xC2494954DA2C9789, 0x802221226BE55A64}, // 1e146
+    {0xF2DB9BAA10B7BD6C, 0xA02AA96B06DEB0FD}, // 1e147
+    {0x6F92829494E5ACC7, 0xC83553C5C8965D3D}, // 1e148
+    {0xCB772339BA1F17F9, 0xFA42A8B73ABBF48C}, // 1e149
+    {0xFF2A760414536EFB, 0x9C69A97284B578D7}, // 1e150
+    {0xFEF5138519684ABA, 0xC38413CF25E2D70D}, // 1e151
+    {0x7EB258665FC25D69, 0xF46518C2EF5B8CD1}, // 1e152
+    {0xEF2F773FFBD97A61, 0x98BF2F79D5993802}, // 1e153
+    {0xAAFB550FFACFD8FA, 0xBEEEFB584AFF8603}, // 1e154
+    {0x95BA2A53F983CF38, 0xEEAABA2E5DBF6784}, // 1e155
+    {0xDD945A747BF26183, 0x952AB45CFA97A0B2}, // 1e156
+    {0x94F971119AEEF9E4, 0xBA756174393D88DF}, // 1e157
+    {0x7A37CD5601AAB85D, 0xE912B9D1478CEB17}, // 1e158
+    {0xAC62E055C10AB33A, 0x91ABB422CCB812EE}, // 1e159
+    {0x577B986B314D6009, 0xB616A12B7FE617AA}, // 1e160
+    {0xED5A7E85FDA0B80B, 0xE39C49765FDF9D94}, // 1e161
+    {0x14588F13BE847307, 0x8E41ADE9FBEBC27D}, // 1e162
+    {0x596EB2D8AE258FC8, 0xB1D219647AE6B31C}, // 1e163
+    {0x6FCA5F8ED9AEF3BB, 0xDE469FBD99A05FE3}, // 1e164
+    {0x25DE7BB9480D5854, 0x8AEC23D680043BEE}, // 1e165
+    {0xAF561AA79A10AE6A, 0xADA72CCC20054AE9}, // 1e166
+    {0x1B2BA1518094DA04, 0xD910F7FF28069DA4}, // 1e167
+    {0x90FB44D2F05D0842, 0x87AA9AFF79042286}, // 1e168
+    {0x353A1607AC744A53, 0xA99541BF57452B28}, // 1e169
+    {0x42889B8997915CE8, 0xD3FA922F2D1675F2}, // 1e170
+    {0x69956135FEBADA11, 0x847C9B5D7C2E09B7}, // 1e171
+    {0x43FAB9837E699095, 0xA59BC234DB398C25}, // 1e172
+    {0x94F967E45E03F4BB, 0xCF02B2C21207EF2E}, // 1e173
+    {0x1D1BE0EEBAC278F5, 0x8161AFB94B44F57D}, // 1e174
+    {0x6462D92A69731732, 0xA1BA1BA79E1632DC}, // 1e175
+    {0x7D7B8F7503CFDCFE, 0xCA28A291859BBF93}, // 1e176
+    {0x5CDA735244C3D43E, 0xFCB2CB35E702AF78}, // 1e177
+    {0x3A0888136AFA64A7, 0x9DEFBF01B061ADAB}, // 1e178
+    {0x088AAA1845B8FDD0, 0xC56BAEC21C7A1916}, // 1e179
+    {0x8AAD549E57273D45, 0xF6C69A72A3989F5B}, // 1e180
+    {0x36AC54E2F678864B, 0x9A3C2087A63F6399}, // 1e181
+    {0x84576A1BB416A7DD, 0xC0CB28A98FCF3C7F}, // 1e182
+    {0x656D44A2A11C51D5, 0xF0FDF2D3F3C30B9F}, // 1e183
+    {0x9F644AE5A4B1B325, 0x969EB7C47859E743}, // 1e184
+    {0x873D5D9F0DDE1FEE, 0xBC4665B596706114}, // 1e185
+    {0xA90CB506D155A7EA, 0xEB57FF22FC0C7959}, // 1e186
+    {0x09A7F12442D588F2, 0x9316FF75DD87CBD8}, // 1e187
+    {0x0C11ED6D538AEB2F, 0xB7DCBF5354E9BECE}, // 1e188
+    {0x8F1668C8A86DA5FA, 0xE5D3EF282A242E81}, // 1e189
+    {0xF96E017D694487BC, 0x8FA475791A569D10}, // 1e190
+    {0x37C981DCC395A9AC, 0xB38D92D760EC4455}, // 1e191
+    {0x85BBE253F47B1417, 0xE070F78D3927556A}, // 1e192
+    {0x93956D7478CCEC8E, 0x8C469AB843B89562}, // 1e193
+    {0x387AC8D1970027B2, 0xAF58416654A6BABB}, // 1e194
+    {0x06997B05FCC0319E, 0xDB2E51BFE9D0696A}, // 1e195
+    {0x441FECE3BDF81F03, 0x88FCF317F22241E2}, // 1e196
+    {0xD527E81CAD7626C3, 0xAB3C2FDDEEAAD25A}, // 1e197
+    {0x8A71E223D8D3B074, 0xD60B3BD56A5586F1}, // 1e198
+    {0xF6872D5667844E49, 0x85C7056562757456}, // 1e199
+    {0xB428F8AC016561DB, 0xA738C6BEBB12D16C}, // 1e200
+    {0xE13336D701BEBA52, 0xD106F86E69D785C7}, // 1e201
+    {0xECC0024661173473, 0x82A45B450226B39C}, // 1e202
+    {0x27F002D7F95D0190, 0xA34D721642B06084}, // 1e203
+    {0x31EC038DF7B441F4, 0xCC20CE9BD35C78A5}, // 1e204
+    {0x7E67047175A15271, 0xFF290242C83396CE}, // 1e205
+    {0x0F0062C6E984D386, 0x9F79A169BD203E41}, // 1e206
+    {0x52C07B78A3E60868, 0xC75809C42C684DD1}, // 1e207
+    {0xA7709A56CCDF8A82, 0xF92E0C3537826145}, // 1e208
+    {0x88A66076400BB691, 0x9BBCC7A142B17CCB}, // 1e209
+    {0x6ACFF893D00EA435, 0xC2ABF989935DDBFE}, // 1e210
+    {0x0583F6B8C4124D43, 0xF356F7EBF83552FE}, // 1e211
+    {0xC3727A337A8B704A, 0x98165AF37B2153DE}, // 1e212
+    {0x744F18C0592E4C5C, 0xBE1BF1B059E9A8D6}, // 1e213
+    {0x1162DEF06F79DF73, 0xEDA2EE1C7064130C}, // 1e214
+    {0x8ADDCB5645AC2BA8, 0x9485D4D1C63E8BE7}, // 1e215
+    {0x6D953E2BD7173692, 0xB9A74A0637CE2EE1}, // 1e216
+    {0xC8FA8DB6CCDD0437, 0xE8111C87C5C1BA99}, // 1e217
+    {0x1D9C9892400A22A2, 0x910AB1D4DB9914A0}, // 1e218
+    {0x2503BEB6D00CAB4B, 0xB54D5E4A127F59C8}, // 1e219
+    {0x2E44AE64840FD61D, 0xE2A0B5DC971F303A}, // 1e220
+    {0x5CEAECFED289E5D2, 0x8DA471A9DE737E24}, // 1e221
+    {0x7425A83E872C5F47, 0xB10D8E1456105DAD}, // 1e222
+    {0xD12F124E28F77719, 0xDD50F1996B947518}, // 1e223
+    {0x82BD6B70D99AAA6F, 0x8A5296FFE33CC92F}, // 1e224
+    {0x636CC64D1001550B, 0xACE73CBFDC0BFB7B}, // 1e225
+    {0x3C47F7E05401AA4E, 0xD8210BEFD30EFA5A}, // 1e226
+    {0x65ACFAEC34810A71, 0x8714A775E3E95C78}, // 1e227
+    {0x7F1839A741A14D0D, 0xA8D9D1535CE3B396}, // 1e228
+    {0x1EDE48111209A050, 0xD31045A8341CA07C}, // 1e229
+    {0x934AED0AAB460432, 0x83EA2B892091E44D}, // 1e230
+    {0xF81DA84D5617853F, 0xA4E4B66B68B65D60}, // 1e231
+    {0x36251260AB9D668E, 0xCE1DE40642E3F4B9}, // 1e232
+    {0xC1D72B7C6B426019, 0x80D2AE83E9CE78F3}, // 1e233
+    {0xB24CF65B8612F81F, 0xA1075A24E4421730}, // 1e234
+    {0xDEE033F26797B627, 0xC94930AE1D529CFC}, // 1e235
+    {0x169840EF017DA3B1, 0xFB9B7CD9A4A7443C}, // 1e236
+    {0x8E1F289560EE864E, 0x9D412E0806E88AA5}, // 1e237
+    {0xF1A6F2BAB92A27E2, 0xC491798A08A2AD4E}, // 1e238
+    {0xAE10AF696774B1DB, 0xF5B5D7EC8ACB58A2}, // 1e239
+    {0xACCA6DA1E0A8EF29, 0x9991A6F3D6BF1765}, // 1e240
+    {0x17FD090A58D32AF3, 0xBFF610B0CC6EDD3F}, // 1e241
+    {0xDDFC4B4CEF07F5B0, 0xEFF394DCFF8A948E}, // 1e242
+    {0x4ABDAF101564F98E, 0x95F83D0A1FB69CD9}, // 1e243
+    {0x9D6D1AD41ABE37F1, 0xBB764C4CA7A4440F}, // 1e244
+    {0x84C86189216DC5ED, 0xEA53DF5FD18D5513}, // 1e245
+    {0x32FD3CF5B4E49BB4, 0x92746B9BE2F8552C}, // 1e246
+    {0x3FBC8C33221DC2A1, 0xB7118682DBB66A77}, // 1e247
+    {0x0FABAF3FEAA5334A, 0xE4D5E82392A40515}, // 1e248
+    {0x29CB4D87F2A7400E, 0x8F05B1163BA6832D}, // 1e249
+    {0x743E20E9EF511012, 0xB2C71D5BCA9023F8}, // 1e250
+    {0x914DA9246B255416, 0xDF78E4B2BD342CF6}, // 1e251
+    {0x1AD089B6C2F7548E, 0x8BAB8EEFB6409C1A}, // 1e252
+    {0xA184AC2473B529B1, 0xAE9672ABA3D0C320}, // 1e253
+    {0xC9E5D72D90A2741E, 0xDA3C0F568CC4F3E8}, // 1e254
+    {0x7E2FA67C7A658892, 0x8865899617FB1871}, // 1e255
+    {0xDDBB901B98FEEAB7, 0xAA7EEBFB9DF9DE8D}, // 1e256
+    {0x552A74227F3EA565, 0xD51EA6FA85785631}, // 1e257
+    {0xD53A88958F87275F, 0x8533285C936B35DE}, // 1e258
+    {0x8A892ABAF368F137, 0xA67FF273B8460356}, // 1e259
+    {0x2D2B7569B0432D85, 0xD01FEF10A657842C}, // 1e260
+    {0x9C3B29620E29FC73, 0x8213F56A67F6B29B}, // 1e261
+    {0x8349F3BA91B47B8F, 0xA298F2C501F45F42}, // 1e262
+    {0x241C70A936219A73, 0xCB3F2F7642717713}, // 1e263
+    {0xED238CD383AA0110, 0xFE0EFB53D30DD4D7}, // 1e264
+    {0xF4363804324A40AA, 0x9EC95D1463E8A506}, // 1e265
+    {0xB143C6053EDCD0D5, 0xC67BB4597CE2CE48}, // 1e266
+    {0xDD94B7868E94050A, 0xF81AA16FDC1B81DA}, // 1e267
+    {0xCA7CF2B4191C8326, 0x9B10A4E5E9913128}, // 1e268
+    {0xFD1C2F611F63A3F0, 0xC1D4CE1F63F57D72}, // 1e269
+    {0xBC633B39673C8CEC, 0xF24A01A73CF2DCCF}, // 1e270
+    {0xD5BE0503E085D813, 0x976E41088617CA01}, // 1e271
+    {0x4B2D8644D8A74E18, 0xBD49D14AA79DBC82}, // 1e272
+    {0xDDF8E7D60ED1219E, 0xEC9C459D51852BA2}, // 1e273
+    {0xCABB90E5C942B503, 0x93E1AB8252F33B45}, // 1e274
+    {0x3D6A751F3B936243, 0xB8DA1662E7B00A17}, // 1e275
+    {0x0CC512670A783AD4, 0xE7109BFBA19C0C9D}, // 1e276
+    {0x27FB2B80668B24C5, 0x906A617D450187E2}, // 1e277
+    {0xB1F9F660802DEDF6, 0xB484F9DC9641E9DA}, // 1e278
+    {0x5E7873F8A0396973, 0xE1A63853BBD26451}, // 1e279
+    {0xDB0B487B6423E1E8, 0x8D07E33455637EB2}, // 1e280
+    {0x91CE1A9A3D2CDA62, 0xB049DC016ABC5E5F}, // 1e281
+    {0x7641A140CC7810FB, 0xDC5C5301C56B75F7}, // 1e282
+    {0xA9E904C87FCB0A9D, 0x89B9B3E11B6329BA}, // 1e283
+    {0x546345FA9FBDCD44, 0xAC2820D9623BF429}, // 1e284
+    {0xA97C177947AD4095, 0xD732290FBACAF133}, // 1e285
+    {0x49ED8EABCCCC485D, 0x867F59A9D4BED6C0}, // 1e286
+    {0x5C68F256BFFF5A74, 0xA81F301449EE8C70}, // 1e287
+    {0x73832EEC6FFF3111, 0xD226FC195C6A2F8C}, // 1e288
+    {0xC831FD53C5FF7EAB, 0x83585D8FD9C25DB7}, // 1e289
+    {0xBA3E7CA8B77F5E55, 0xA42E74F3D032F525}, // 1e290
+    {0x28CE1BD2E55F35EB, 0xCD3A1230C43FB26F}, // 1e291
+    {0x7980D163CF5B81B3, 0x80444B5E7AA7CF85}, // 1e292
+    {0xD7E105BCC332621F, 0xA0555E361951C366}, // 1e293
+    {0x8DD9472BF3FEFAA7, 0xC86AB5C39FA63440}, // 1e294
+    {0xB14F98F6F0FEB951, 0xFA856334878FC150}, // 1e295
+    {0x6ED1BF9A569F33D3, 0x9C935E00D4B9D8D2}, // 1e296
+    {0x0A862F80EC4700C8, 0xC3B8358109E84F07}, // 1e297
+    {0xCD27BB612758C0FA, 0xF4A642E14C6262C8}, // 1e298
+    {0x8038D51CB897789C, 0x98E7E9CCCFBD7DBD}, // 1e299
+    {0xE0470A63E6BD56C3, 0xBF21E44003ACDD2C}, // 1e300
+    {0x1858CCFCE06CAC74, 0xEEEA5D5004981478}, // 1e301
+    {0x0F37801E0C43EBC8, 0x95527A5202DF0CCB}, // 1e302
+    {0xD30560258F54E6BA, 0xBAA718E68396CFFD}, // 1e303
+    {0x47C6B82EF32A2069, 0xE950DF20247C83FD}, // 1e304
+    {0x4CDC331D57FA5441, 0x91D28B7416CDD27E}, // 1e305
+    {0xE0133FE4ADF8E952, 0xB6472E511C81471D}, // 1e306
+    {0x58180FDDD97723A6, 0xE3D8F9E563A198E5}, // 1e307
+    {0x570F09EAA7EA7648, 0x8E679C2F5E44FF8F}, // 1e308
+    {0x2CD2CC6551E513DA, 0xB201833B35D63F73}, // 1e309
+    {0xF8077F7EA65E58D1, 0xDE81E40A034BCF4F}, // 1e310
+    {0xFB04AFAF27FAF782, 0x8B112E86420F6191}, // 1e311
+    {0x79C5DB9AF1F9B563, 0xADD57A27D29339F6}, // 1e312
+    {0x18375281AE7822BC, 0xD94AD8B1C7380874}, // 1e313
+    {0x8F2293910D0B15B5, 0x87CEC76F1C830548}, // 1e314
+    {0xB2EB3875504DDB22, 0xA9C2794AE3A3C69A}, // 1e315
+    {0x5FA60692A46151EB, 0xD433179D9C8CB841}, // 1e316
+    {0xDBC7C41BA6BCD333, 0x849FEEC281D7F328}, // 1e317
+    {0x12B9B522906C0800, 0xA5C7EA73224DEFF3}, // 1e318
+    {0xD768226B34870A00, 0xCF39E50FEAE16BEF}, // 1e319
+    {0xE6A1158300D46640, 0x81842F29F2CCE375}, // 1e320
+    {0x60495AE3C1097FD0, 0xA1E53AF46F801C53}, // 1e321
+    {0x385BB19CB14BDFC4, 0xCA5E89B18B602368}, // 1e322
+    {0x46729E03DD9ED7B5, 0xFCF62C1DEE382C42}, // 1e323
+    {0x6C07A2C26A8346D1, 0x9E19DB92B4E31BA9}, // 1e324
+    {0xC7098B7305241885, 0xC5A05277621BE293}, // 1e325
+    {0xB8CBEE4FC66D1EA7, 0xF70867153AA2DB38}, // 1e326
+    {0x737F74F1DC043328, 0x9A65406D44A5C903}, // 1e327
+    {0x505F522E53053FF2, 0xC0FE908895CF3B44}, // 1e328
+    {0x647726B9E7C68FEF, 0xF13E34AABB430A15}, // 1e329
+    {0x5ECA783430DC19F5, 0x96C6E0EAB509E64D}, // 1e330
+    {0xB67D16413D132072, 0xBC789925624C5FE0}, // 1e331
+    {0xE41C5BD18C57E88F, 0xEB96BF6EBADF77D8}, // 1e332
+    {0x8E91B962F7B6F159, 0x933E37A534CBAAE7}, // 1e333
+    {0x723627BBB5A4ADB0, 0xB80DC58E81FE95A1}, // 1e334
+    {0xCEC3B1AAA30DD91C, 0xE61136F2227E3B09}, // 1e335
+    {0x213A4F0AA5E8A7B1, 0x8FCAC257558EE4E6}, // 1e336
+    {0xA988E2CD4F62D19D, 0xB3BD72ED2AF29E1F}, // 1e337
+    {0x93EB1B80A33B8605, 0xE0ACCFA875AF45A7}, // 1e338
+    {0xBC72F130660533C3, 0x8C6C01C9498D8B88}, // 1e339
+    {0xEB8FAD7C7F8680B4, 0xAF87023B9BF0EE6A}, // 1e340
+    {0xA67398DB9F6820E1, 0xDB68C2CA82ED2A05}, // 1e341
+    {0x88083F8943A1148C, 0x892179BE91D43A43}, // 1e342
+    {0x6A0A4F6B948959B0, 0xAB69D82E364948D4}, // 1e343
+    {0x848CE34679ABB01C, 0xD6444E39C3DB9B09}, // 1e344
+    {0xF2D80E0C0C0B4E11, 0x85EAB0E41A6940E5}, // 1e345
+    {0x6F8E118F0F0E2195, 0xA7655D1D2103911F}, // 1e346
+    {0x4B7195F2D2D1A9FB, 0xD13EB46469447567}, // 1e347
+};
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_DETAILED_POWERS_OF_TEN_H
diff --git a/contrib/llvm-project/libc/src/__support/endian_internal.h b/contrib/llvm-project/libc/src/__support/endian_internal.h
new file mode 100644
index 000000000000..77839ad75455
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/endian_internal.h
@@ -0,0 +1,146 @@
+//===-- Endianness support --------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_ENDIAN_INTERNAL_H
+#define LLVM_LIBC_SRC___SUPPORT_ENDIAN_INTERNAL_H
+
+#include "common.h"
+#include "src/__support/macros/config.h"
+
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+
+// We rely on compiler preprocessor defines to allow for cross compilation.
+#if !defined(__BYTE_ORDER__) || !defined(__ORDER_LITTLE_ENDIAN__) ||           \
+    !defined(__ORDER_BIG_ENDIAN__)
+#error "Missing preprocessor definitions for endianness detection."
+#endif
+
+namespace internal {
+
+// Converts uint8_t, uint16_t, uint32_t, uint64_t to its big or little endian
+// counterpart.
+// We use explicit template specialization:
+// - to prevent accidental integer promotion.
+// - to prevent fallback in (unlikely) case of middle-endianness.
+
+template <unsigned ORDER> struct Endian {
+  static constexpr const bool IS_LITTLE = ORDER == __ORDER_LITTLE_ENDIAN__;
+  static constexpr const bool IS_BIG = ORDER == __ORDER_BIG_ENDIAN__;
+  template <typename T> LIBC_INLINE static T to_big_endian(T value);
+  template <typename T> LIBC_INLINE static T to_little_endian(T value);
+};
+
+// Little Endian specializations
+template <>
+template <>
+LIBC_INLINE uint8_t
+Endian<__ORDER_LITTLE_ENDIAN__>::to_big_endian<uint8_t>(uint8_t v) {
+  return v;
+}
+template <>
+template <>
+LIBC_INLINE uint8_t
+Endian<__ORDER_LITTLE_ENDIAN__>::to_little_endian<uint8_t>(uint8_t v) {
+  return v;
+}
+template <>
+template <>
+LIBC_INLINE uint16_t
+Endian<__ORDER_LITTLE_ENDIAN__>::to_big_endian<uint16_t>(uint16_t v) {
+  return __builtin_bswap16(v);
+}
+template <>
+template <>
+LIBC_INLINE uint16_t
+Endian<__ORDER_LITTLE_ENDIAN__>::to_little_endian<uint16_t>(uint16_t v) {
+  return v;
+}
+template <>
+template <>
+LIBC_INLINE uint32_t
+Endian<__ORDER_LITTLE_ENDIAN__>::to_big_endian<uint32_t>(uint32_t v) {
+  return __builtin_bswap32(v);
+}
+template <>
+template <>
+LIBC_INLINE uint32_t
+Endian<__ORDER_LITTLE_ENDIAN__>::to_little_endian<uint32_t>(uint32_t v) {
+  return v;
+}
+template <>
+template <>
+LIBC_INLINE uint64_t
+Endian<__ORDER_LITTLE_ENDIAN__>::to_big_endian<uint64_t>(uint64_t v) {
+  return __builtin_bswap64(v);
+}
+template <>
+template <>
+LIBC_INLINE uint64_t
+Endian<__ORDER_LITTLE_ENDIAN__>::to_little_endian<uint64_t>(uint64_t v) {
+  return v;
+}
+
+// Big Endian specializations
+template <>
+template <>
+LIBC_INLINE uint8_t
+Endian<__ORDER_BIG_ENDIAN__>::to_big_endian<uint8_t>(uint8_t v) {
+  return v;
+}
+template <>
+template <>
+LIBC_INLINE uint8_t
+Endian<__ORDER_BIG_ENDIAN__>::to_little_endian<uint8_t>(uint8_t v) {
+  return v;
+}
+template <>
+template <>
+LIBC_INLINE uint16_t
+Endian<__ORDER_BIG_ENDIAN__>::to_big_endian<uint16_t>(uint16_t v) {
+  return v;
+}
+template <>
+template <>
+LIBC_INLINE uint16_t
+Endian<__ORDER_BIG_ENDIAN__>::to_little_endian<uint16_t>(uint16_t v) {
+  return __builtin_bswap16(v);
+}
+template <>
+template <>
+LIBC_INLINE uint32_t
+Endian<__ORDER_BIG_ENDIAN__>::to_big_endian<uint32_t>(uint32_t v) {
+  return v;
+}
+template <>
+template <>
+LIBC_INLINE uint32_t
+Endian<__ORDER_BIG_ENDIAN__>::to_little_endian<uint32_t>(uint32_t v) {
+  return __builtin_bswap32(v);
+}
+template <>
+template <>
+LIBC_INLINE uint64_t
+Endian<__ORDER_BIG_ENDIAN__>::to_big_endian<uint64_t>(uint64_t v) {
+  return v;
+}
+template <>
+template <>
+LIBC_INLINE uint64_t
+Endian<__ORDER_BIG_ENDIAN__>::to_little_endian<uint64_t>(uint64_t v) {
+  return __builtin_bswap64(v);
+}
+
+} // namespace internal
+
+using Endian = internal::Endian<__BYTE_ORDER__>;
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_ENDIAN_INTERNAL_H
diff --git a/contrib/llvm-project/libc/src/__support/error_or.h b/contrib/llvm-project/libc/src/__support/error_or.h
new file mode 100644
index 000000000000..3faaddde6cd3
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/error_or.h
@@ -0,0 +1,40 @@
+//===-- A data structure for returning an error or a value ------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_ERROR_OR_H
+#define LLVM_LIBC_SRC___SUPPORT_ERROR_OR_H
+
+#include "src/__support/CPP/expected.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+template <class T> using ErrorOr = cpp::expected<T, int>;
+
+using Error = cpp::unexpected<int>;
+
+// template <typename T> struct ErrorOr {
+//   union {
+//     T value;
+//     int error;
+//   };
+//   bool is_error;
+
+//   constexpr ErrorOr(T value) : value(value), is_error(false) {}
+//   constexpr ErrorOr(int error, bool is_error)
+//       : error(error), is_error(is_error) {}
+
+//   constexpr bool has_error() { return is_error; }
+
+//   constexpr operator bool() { return is_error; }
+//   constexpr operator T() { return value; }
+// };
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_ERROR_OR_H
diff --git a/contrib/llvm-project/libc/src/__support/fixed_point/fx_bits.h b/contrib/llvm-project/libc/src/__support/fixed_point/fx_bits.h
new file mode 100644
index 000000000000..00c6119b4f35
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/fixed_point/fx_bits.h
@@ -0,0 +1,232 @@
+//===-- Utility class to manipulate fixed point numbers. --*- C++ -*-=========//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FIXED_POINT_FX_BITS_H
+#define LLVM_LIBC_SRC___SUPPORT_FIXED_POINT_FX_BITS_H
+
+#include "include/llvm-libc-macros/stdfix-macros.h"
+#include "src/__support/CPP/bit.h"
+#include "src/__support/CPP/limits.h" // numeric_limits
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/macros/attributes.h"   // LIBC_INLINE
+#include "src/__support/macros/config.h"       // LIBC_NAMESPACE_DECL
+#include "src/__support/macros/null_check.h"   // LIBC_CRASH_ON_VALUE
+#include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
+#include "src/__support/math_extras.h"
+
+#include "fx_rep.h"
+
+#ifdef LIBC_COMPILER_HAS_FIXED_POINT
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fixed_point {
+
+template <typename T> struct FXBits {
+private:
+  using fx_rep = FXRep<T>;
+  using StorageType = typename fx_rep::StorageType;
+
+  StorageType value;
+
+  static_assert(fx_rep::FRACTION_LEN > 0);
+
+  static constexpr size_t FRACTION_OFFSET = 0; // Just for completeness
+  static constexpr size_t INTEGRAL_OFFSET =
+      fx_rep::INTEGRAL_LEN == 0 ? 0 : fx_rep::FRACTION_LEN;
+  static constexpr size_t SIGN_OFFSET =
+      fx_rep::SIGN_LEN == 0
+          ? 0
+          : ((sizeof(StorageType) * CHAR_BIT) - fx_rep::SIGN_LEN);
+
+  static constexpr StorageType FRACTION_MASK =
+      mask_trailing_ones<StorageType, fx_rep::FRACTION_LEN>()
+      << FRACTION_OFFSET;
+  static constexpr StorageType INTEGRAL_MASK =
+      mask_trailing_ones<StorageType, fx_rep::INTEGRAL_LEN>()
+      << INTEGRAL_OFFSET;
+  static constexpr StorageType SIGN_MASK =
+      (fx_rep::SIGN_LEN == 0 ? 0 : StorageType(1) << SIGN_OFFSET);
+
+  // mask for <integral | fraction>
+  static constexpr StorageType VALUE_MASK = INTEGRAL_MASK | FRACTION_MASK;
+
+  // mask for <sign | integral | fraction>
+  static constexpr StorageType TOTAL_MASK = SIGN_MASK | VALUE_MASK;
+
+public:
+  LIBC_INLINE constexpr FXBits() = default;
+
+  template <typename XType> LIBC_INLINE constexpr explicit FXBits(XType x) {
+    using Unqual = typename cpp::remove_cv_t<XType>;
+    if constexpr (cpp::is_same_v<Unqual, T>) {
+      value = cpp::bit_cast<StorageType>(x);
+    } else if constexpr (cpp::is_same_v<Unqual, StorageType>) {
+      value = x;
+    } else {
+      // We don't want accidental type promotions/conversions, so we require
+      // exact type match.
+      static_assert(cpp::always_false<XType>);
+    }
+  }
+
+  LIBC_INLINE constexpr StorageType get_fraction() {
+    return (value & FRACTION_MASK) >> FRACTION_OFFSET;
+  }
+
+  LIBC_INLINE constexpr StorageType get_integral() {
+    return (value & INTEGRAL_MASK) >> INTEGRAL_OFFSET;
+  }
+
+  // returns complete bitstring representation the fixed point number
+  // the bitstring is of the form: padding | sign | integral | fraction
+  LIBC_INLINE constexpr StorageType get_bits() {
+    return (value & TOTAL_MASK) >> FRACTION_OFFSET;
+  }
+
+  // TODO: replace bool with Sign
+  LIBC_INLINE constexpr bool get_sign() {
+    return static_cast<bool>((value & SIGN_MASK) >> SIGN_OFFSET);
+  }
+
+  // This represents the effective negative exponent applied to this number
+  LIBC_INLINE constexpr int get_exponent() { return fx_rep::FRACTION_LEN; }
+
+  LIBC_INLINE constexpr void set_fraction(StorageType fraction) {
+    value = (value & (~FRACTION_MASK)) |
+            ((fraction << FRACTION_OFFSET) & FRACTION_MASK);
+  }
+
+  LIBC_INLINE constexpr void set_integral(StorageType integral) {
+    value = (value & (~INTEGRAL_MASK)) |
+            ((integral << INTEGRAL_OFFSET) & INTEGRAL_MASK);
+  }
+
+  // TODO: replace bool with Sign
+  LIBC_INLINE constexpr void set_sign(bool sign) {
+    value = (value & (~SIGN_MASK)) |
+            ((static_cast<StorageType>(sign) << SIGN_OFFSET) & SIGN_MASK);
+  }
+
+  LIBC_INLINE constexpr T get_val() const { return cpp::bit_cast<T>(value); }
+};
+
+// Bit-wise operations are not available for fixed point types yet.
+template <typename T>
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_fixed_point_v<T>, T>
+bit_and(T x, T y) {
+  using BitType = typename FXRep<T>::StorageType;
+  BitType x_bit = cpp::bit_cast<BitType>(x);
+  BitType y_bit = cpp::bit_cast<BitType>(y);
+  // For some reason, bit_cast cannot deduce BitType from the input.
+  return cpp::bit_cast<T, BitType>(x_bit & y_bit);
+}
+
+template <typename T>
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_fixed_point_v<T>, T>
+bit_or(T x, T y) {
+  using BitType = typename FXRep<T>::StorageType;
+  BitType x_bit = cpp::bit_cast<BitType>(x);
+  BitType y_bit = cpp::bit_cast<BitType>(y);
+  // For some reason, bit_cast cannot deduce BitType from the input.
+  return cpp::bit_cast<T, BitType>(x_bit | y_bit);
+}
+
+template <typename T>
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_fixed_point_v<T>, T>
+bit_not(T x) {
+  using BitType = typename FXRep<T>::StorageType;
+  BitType x_bit = cpp::bit_cast<BitType>(x);
+  // For some reason, bit_cast cannot deduce BitType from the input.
+  return cpp::bit_cast<T, BitType>(static_cast<BitType>(~x_bit));
+}
+
+template <typename T> LIBC_INLINE constexpr T abs(T x) {
+  using FXRep = FXRep<T>;
+  if constexpr (FXRep::SIGN_LEN == 0)
+    return x;
+  else {
+    if (LIBC_UNLIKELY(x == FXRep::MIN()))
+      return FXRep::MAX();
+    return (x < FXRep::ZERO() ? -x : x);
+  }
+}
+
+// Round-to-nearest, tie-to-(+Inf)
+template <typename T> LIBC_INLINE constexpr T round(T x, int n) {
+  using FXRep = FXRep<T>;
+  if (LIBC_UNLIKELY(n < 0))
+    n = 0;
+  if (LIBC_UNLIKELY(n >= FXRep::FRACTION_LEN))
+    return x;
+
+  T round_bit = FXRep::EPS() << (FXRep::FRACTION_LEN - n - 1);
+  // Check for overflow.
+  if (LIBC_UNLIKELY(FXRep::MAX() - round_bit < x))
+    return FXRep::MAX();
+
+  T all_ones = bit_not(FXRep::ZERO());
+
+  int shift = FXRep::FRACTION_LEN - n;
+  T rounding_mask =
+      (shift == FXRep::TOTAL_LEN) ? FXRep::ZERO() : (all_ones << shift);
+  return bit_and((x + round_bit), rounding_mask);
+}
+
+// count leading sign bits
+// TODO: support fixed_point_padding
+template <typename T>
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_fixed_point_v<T>, int>
+countls(T f) {
+  using FXRep = FXRep<T>;
+  using BitType = typename FXRep::StorageType;
+  using FXBits = FXBits<T>;
+
+  if constexpr (FXRep::SIGN_LEN > 0) {
+    if (f < 0)
+      f = bit_not(f);
+  }
+
+  BitType value_bits = FXBits(f).get_bits();
+  return cpp::countl_zero(value_bits) - FXRep::SIGN_LEN;
+}
+
+// fixed-point to integer conversion
+template <typename T, typename XType>
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_fixed_point_v<T>, XType>
+bitsfx(T f) {
+  return cpp::bit_cast<XType, T>(f);
+}
+
+// divide the two fixed-point types and return an integer result
+template <typename T, typename XType>
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_fixed_point_v<T>, XType>
+idiv(T x, T y) {
+  using FXBits = FXBits<T>;
+  using FXRep = FXRep<T>;
+  using CompType = typename FXRep::CompType;
+
+  // If the value of the second operand of the / operator is zero, the
+  // behavior is undefined. Ref: ISO/IEC TR 18037:2008(E) p.g. 16
+  LIBC_CRASH_ON_VALUE(y, FXRep::ZERO());
+
+  CompType x_comp = static_cast<CompType>(FXBits(x).get_bits());
+  CompType y_comp = static_cast<CompType>(FXBits(y).get_bits());
+
+  // If an integer result of one of these functions overflows, the behavior is
+  // undefined. Ref: ISO/IEC TR 18037:2008(E) p.g. 16
+  CompType result = x_comp / y_comp;
+
+  return static_cast<XType>(result);
+}
+
+} // namespace fixed_point
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LIBC_COMPILER_HAS_FIXED_POINT
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FIXED_POINT_FX_BITS_H
diff --git a/contrib/llvm-project/libc/src/__support/fixed_point/fx_rep.h b/contrib/llvm-project/libc/src/__support/fixed_point/fx_rep.h
new file mode 100644
index 000000000000..7227fffa683a
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/fixed_point/fx_rep.h
@@ -0,0 +1,303 @@
+//===-- Utility class to manipulate fixed point numbers. --*- C++ -*-=========//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FIXED_POINT_FX_REP_H
+#define LLVM_LIBC_SRC___SUPPORT_FIXED_POINT_FX_REP_H
+
+#include "include/llvm-libc-macros/stdfix-macros.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/macros/attributes.h" // LIBC_INLINE, LIBC_INLINE_VAR
+#include "src/__support/macros/config.h"
+
+#include <stdint.h>
+
+#ifdef LIBC_COMPILER_HAS_FIXED_POINT
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fixed_point {
+
+namespace internal {
+
+template <int Bits> struct Storage {
+  static_assert(Bits > 0 && Bits <= 64, "Bits has to be between 1 and 64.");
+  using Type = typename cpp::conditional_t<
+      (Bits <= 8), uint8_t,
+      typename cpp::conditional_t<
+          (Bits <= 16 && Bits > 8), uint16_t,
+          typename cpp::conditional_t<(Bits <= 32 && Bits > 16), uint32_t,
+                                      uint64_t>>>;
+};
+
+} // namespace internal
+
+template <typename T> struct FXRep;
+
+template <> struct FXRep<short fract> {
+  using Type = short _Fract;
+
+  LIBC_INLINE_VAR static constexpr int SIGN_LEN = 1;
+  LIBC_INLINE_VAR static constexpr int INTEGRAL_LEN = 0;
+  LIBC_INLINE_VAR static constexpr int FRACTION_LEN = SFRACT_FBIT;
+  LIBC_INLINE_VAR static constexpr int VALUE_LEN = INTEGRAL_LEN + FRACTION_LEN;
+  LIBC_INLINE_VAR static constexpr int TOTAL_LEN = SIGN_LEN + VALUE_LEN;
+
+  LIBC_INLINE static constexpr Type MIN() { return SFRACT_MIN; }
+  LIBC_INLINE static constexpr Type MAX() { return SFRACT_MAX; }
+  LIBC_INLINE static constexpr Type ZERO() { return 0.0HR; }
+  LIBC_INLINE static constexpr Type EPS() { return SFRACT_EPSILON; }
+  LIBC_INLINE static constexpr Type ONE_HALF() { return 0.5HR; }
+  LIBC_INLINE static constexpr Type ONE_FOURTH() { return 0.25HR; }
+
+  using StorageType = typename internal::Storage<TOTAL_LEN>::Type;
+  using CompType = cpp::make_signed_t<StorageType>;
+};
+
+template <> struct FXRep<unsigned short fract> {
+  using Type = unsigned short fract;
+
+  LIBC_INLINE_VAR static constexpr int SIGN_LEN = 0;
+  LIBC_INLINE_VAR static constexpr int INTEGRAL_LEN = 0;
+  LIBC_INLINE_VAR static constexpr int FRACTION_LEN = USFRACT_FBIT;
+  LIBC_INLINE_VAR static constexpr int VALUE_LEN = INTEGRAL_LEN + FRACTION_LEN;
+  LIBC_INLINE_VAR static constexpr int TOTAL_LEN = SIGN_LEN + VALUE_LEN;
+
+  LIBC_INLINE static constexpr Type MIN() { return USFRACT_MIN; }
+  LIBC_INLINE static constexpr Type MAX() { return USFRACT_MAX; }
+  LIBC_INLINE static constexpr Type ZERO() { return 0.0UHR; }
+  LIBC_INLINE static constexpr Type EPS() { return USFRACT_EPSILON; }
+  LIBC_INLINE static constexpr Type ONE_HALF() { return 0.5UHR; }
+  LIBC_INLINE static constexpr Type ONE_FOURTH() { return 0.25UHR; }
+
+  using StorageType = typename internal::Storage<TOTAL_LEN>::Type;
+  using CompType = cpp::make_unsigned_t<StorageType>;
+};
+
+template <> struct FXRep<fract> {
+  using Type = fract;
+
+  LIBC_INLINE_VAR static constexpr int SIGN_LEN = 1;
+  LIBC_INLINE_VAR static constexpr int INTEGRAL_LEN = 0;
+  LIBC_INLINE_VAR static constexpr int FRACTION_LEN = FRACT_FBIT;
+  LIBC_INLINE_VAR static constexpr int VALUE_LEN = INTEGRAL_LEN + FRACTION_LEN;
+  LIBC_INLINE_VAR static constexpr int TOTAL_LEN = SIGN_LEN + VALUE_LEN;
+
+  LIBC_INLINE static constexpr Type MIN() { return FRACT_MIN; }
+  LIBC_INLINE static constexpr Type MAX() { return FRACT_MAX; }
+  LIBC_INLINE static constexpr Type ZERO() { return 0.0R; }
+  LIBC_INLINE static constexpr Type EPS() { return FRACT_EPSILON; }
+  LIBC_INLINE static constexpr Type ONE_HALF() { return 0.5R; }
+  LIBC_INLINE static constexpr Type ONE_FOURTH() { return 0.25R; }
+
+  using StorageType = typename internal::Storage<TOTAL_LEN>::Type;
+  using CompType = cpp::make_signed_t<StorageType>;
+};
+
+template <> struct FXRep<unsigned fract> {
+  using Type = unsigned fract;
+
+  LIBC_INLINE_VAR static constexpr int SIGN_LEN = 0;
+  LIBC_INLINE_VAR static constexpr int INTEGRAL_LEN = 0;
+  LIBC_INLINE_VAR static constexpr int FRACTION_LEN = UFRACT_FBIT;
+  LIBC_INLINE_VAR static constexpr int VALUE_LEN = INTEGRAL_LEN + FRACTION_LEN;
+  LIBC_INLINE_VAR static constexpr int TOTAL_LEN = SIGN_LEN + VALUE_LEN;
+
+  LIBC_INLINE static constexpr Type MIN() { return UFRACT_MIN; }
+  LIBC_INLINE static constexpr Type MAX() { return UFRACT_MAX; }
+  LIBC_INLINE static constexpr Type ZERO() { return 0.0UR; }
+  LIBC_INLINE static constexpr Type EPS() { return UFRACT_EPSILON; }
+  LIBC_INLINE static constexpr Type ONE_HALF() { return 0.5UR; }
+  LIBC_INLINE static constexpr Type ONE_FOURTH() { return 0.25UR; }
+
+  using StorageType = typename internal::Storage<TOTAL_LEN>::Type;
+  using CompType = cpp::make_unsigned_t<StorageType>;
+};
+
+template <> struct FXRep<long fract> {
+  using Type = long fract;
+
+  LIBC_INLINE_VAR static constexpr int SIGN_LEN = 1;
+  LIBC_INLINE_VAR static constexpr int INTEGRAL_LEN = 0;
+  LIBC_INLINE_VAR static constexpr int FRACTION_LEN = LFRACT_FBIT;
+  LIBC_INLINE_VAR static constexpr int VALUE_LEN = INTEGRAL_LEN + FRACTION_LEN;
+  LIBC_INLINE_VAR static constexpr int TOTAL_LEN = SIGN_LEN + VALUE_LEN;
+
+  LIBC_INLINE static constexpr Type MIN() { return LFRACT_MIN; }
+  LIBC_INLINE static constexpr Type MAX() { return LFRACT_MAX; }
+  LIBC_INLINE static constexpr Type ZERO() { return 0.0LR; }
+  LIBC_INLINE static constexpr Type EPS() { return LFRACT_EPSILON; }
+  LIBC_INLINE static constexpr Type ONE_HALF() { return 0.5LR; }
+  LIBC_INLINE static constexpr Type ONE_FOURTH() { return 0.25LR; }
+
+  using StorageType = typename internal::Storage<TOTAL_LEN>::Type;
+  using CompType = cpp::make_signed_t<StorageType>;
+};
+
+template <> struct FXRep<unsigned long fract> {
+  using Type = unsigned long fract;
+
+  LIBC_INLINE_VAR static constexpr int SIGN_LEN = 0;
+  LIBC_INLINE_VAR static constexpr int INTEGRAL_LEN = 0;
+  LIBC_INLINE_VAR static constexpr int FRACTION_LEN = ULFRACT_FBIT;
+  LIBC_INLINE_VAR static constexpr int VALUE_LEN = INTEGRAL_LEN + FRACTION_LEN;
+  LIBC_INLINE_VAR static constexpr int TOTAL_LEN = SIGN_LEN + VALUE_LEN;
+
+  LIBC_INLINE static constexpr Type MIN() { return ULFRACT_MIN; }
+  LIBC_INLINE static constexpr Type MAX() { return ULFRACT_MAX; }
+  LIBC_INLINE static constexpr Type ZERO() { return 0.0ULR; }
+  LIBC_INLINE static constexpr Type EPS() { return ULFRACT_EPSILON; }
+  LIBC_INLINE static constexpr Type ONE_HALF() { return 0.5ULR; }
+  LIBC_INLINE static constexpr Type ONE_FOURTH() { return 0.25ULR; }
+
+  using StorageType = typename internal::Storage<TOTAL_LEN>::Type;
+  using CompType = cpp::make_unsigned_t<StorageType>;
+};
+
+template <> struct FXRep<short accum> {
+  using Type = short accum;
+
+  LIBC_INLINE_VAR static constexpr int SIGN_LEN = 1;
+  LIBC_INLINE_VAR static constexpr int INTEGRAL_LEN = SACCUM_IBIT;
+  LIBC_INLINE_VAR static constexpr int FRACTION_LEN = SACCUM_FBIT;
+  LIBC_INLINE_VAR static constexpr int VALUE_LEN = INTEGRAL_LEN + FRACTION_LEN;
+  LIBC_INLINE_VAR static constexpr int TOTAL_LEN = SIGN_LEN + VALUE_LEN;
+
+  LIBC_INLINE static constexpr Type MIN() { return SACCUM_MIN; }
+  LIBC_INLINE static constexpr Type MAX() { return SACCUM_MAX; }
+  LIBC_INLINE static constexpr Type ZERO() { return 0.0HK; }
+  LIBC_INLINE static constexpr Type EPS() { return SACCUM_EPSILON; }
+  LIBC_INLINE static constexpr Type ONE_HALF() { return 0.5HK; }
+  LIBC_INLINE static constexpr Type ONE_FOURTH() { return 0.25HK; }
+
+  using StorageType = typename internal::Storage<TOTAL_LEN>::Type;
+  using CompType = cpp::make_signed_t<StorageType>;
+};
+
+template <> struct FXRep<unsigned short accum> {
+  using Type = unsigned short accum;
+
+  LIBC_INLINE_VAR static constexpr int SIGN_LEN = 0;
+  LIBC_INLINE_VAR static constexpr int INTEGRAL_LEN = USACCUM_IBIT;
+  LIBC_INLINE_VAR static constexpr int FRACTION_LEN = USACCUM_FBIT;
+  LIBC_INLINE_VAR static constexpr int VALUE_LEN = INTEGRAL_LEN + FRACTION_LEN;
+  LIBC_INLINE_VAR static constexpr int TOTAL_LEN = SIGN_LEN + VALUE_LEN;
+
+  LIBC_INLINE static constexpr Type MIN() { return USACCUM_MIN; }
+  LIBC_INLINE static constexpr Type MAX() { return USACCUM_MAX; }
+  LIBC_INLINE static constexpr Type ZERO() { return 0.0UHK; }
+  LIBC_INLINE static constexpr Type EPS() { return USACCUM_EPSILON; }
+  LIBC_INLINE static constexpr Type ONE_HALF() { return 0.5UHK; }
+  LIBC_INLINE static constexpr Type ONE_FOURTH() { return 0.25UHK; }
+
+  using StorageType = typename internal::Storage<TOTAL_LEN>::Type;
+  using CompType = cpp::make_unsigned_t<StorageType>;
+};
+
+template <> struct FXRep<accum> {
+  using Type = accum;
+
+  LIBC_INLINE_VAR static constexpr int SIGN_LEN = 1;
+  LIBC_INLINE_VAR static constexpr int INTEGRAL_LEN = ACCUM_IBIT;
+  LIBC_INLINE_VAR static constexpr int FRACTION_LEN = ACCUM_FBIT;
+  LIBC_INLINE_VAR static constexpr int VALUE_LEN = INTEGRAL_LEN + FRACTION_LEN;
+  LIBC_INLINE_VAR static constexpr int TOTAL_LEN = SIGN_LEN + VALUE_LEN;
+
+  LIBC_INLINE static constexpr Type MIN() { return ACCUM_MIN; }
+  LIBC_INLINE static constexpr Type MAX() { return ACCUM_MAX; }
+  LIBC_INLINE static constexpr Type ZERO() { return 0.0K; }
+  LIBC_INLINE static constexpr Type EPS() { return ACCUM_EPSILON; }
+  LIBC_INLINE static constexpr Type ONE_HALF() { return 0.5K; }
+  LIBC_INLINE static constexpr Type ONE_FOURTH() { return 0.25K; }
+
+  using StorageType = typename internal::Storage<TOTAL_LEN>::Type;
+  using CompType = cpp::make_signed_t<StorageType>;
+};
+
+template <> struct FXRep<unsigned accum> {
+  using Type = unsigned accum;
+
+  LIBC_INLINE_VAR static constexpr int SIGN_LEN = 0;
+  LIBC_INLINE_VAR static constexpr int INTEGRAL_LEN = UACCUM_IBIT;
+  LIBC_INLINE_VAR static constexpr int FRACTION_LEN = UACCUM_FBIT;
+  LIBC_INLINE_VAR static constexpr int VALUE_LEN = INTEGRAL_LEN + FRACTION_LEN;
+  LIBC_INLINE_VAR static constexpr int TOTAL_LEN = SIGN_LEN + VALUE_LEN;
+
+  LIBC_INLINE static constexpr Type MIN() { return UACCUM_MIN; }
+  LIBC_INLINE static constexpr Type MAX() { return UACCUM_MAX; }
+  LIBC_INLINE static constexpr Type ZERO() { return 0.0UK; }
+  LIBC_INLINE static constexpr Type EPS() { return UACCUM_EPSILON; }
+  LIBC_INLINE static constexpr Type ONE_HALF() { return 0.5UK; }
+  LIBC_INLINE static constexpr Type ONE_FOURTH() { return 0.25UK; }
+
+  using StorageType = typename internal::Storage<TOTAL_LEN>::Type;
+  using CompType = cpp::make_unsigned_t<StorageType>;
+};
+
+template <> struct FXRep<long accum> {
+  using Type = long accum;
+
+  LIBC_INLINE_VAR static constexpr int SIGN_LEN = 1;
+  LIBC_INLINE_VAR static constexpr int INTEGRAL_LEN = LACCUM_IBIT;
+  LIBC_INLINE_VAR static constexpr int FRACTION_LEN = LACCUM_FBIT;
+  LIBC_INLINE_VAR static constexpr int VALUE_LEN = INTEGRAL_LEN + FRACTION_LEN;
+  LIBC_INLINE_VAR static constexpr int TOTAL_LEN = SIGN_LEN + VALUE_LEN;
+
+  LIBC_INLINE static constexpr Type MIN() { return LACCUM_MIN; }
+  LIBC_INLINE static constexpr Type MAX() { return LACCUM_MAX; }
+  LIBC_INLINE static constexpr Type ZERO() { return 0.0LK; }
+  LIBC_INLINE static constexpr Type EPS() { return LACCUM_EPSILON; }
+  LIBC_INLINE static constexpr Type ONE_HALF() { return 0.5LK; }
+  LIBC_INLINE static constexpr Type ONE_FOURTH() { return 0.25LK; }
+
+  using StorageType = typename internal::Storage<TOTAL_LEN>::Type;
+  using CompType = cpp::make_signed_t<StorageType>;
+};
+
+template <> struct FXRep<unsigned long accum> {
+  using Type = unsigned long accum;
+
+  LIBC_INLINE_VAR static constexpr int SIGN_LEN = 0;
+  LIBC_INLINE_VAR static constexpr int INTEGRAL_LEN = ULACCUM_IBIT;
+  LIBC_INLINE_VAR static constexpr int FRACTION_LEN = ULACCUM_FBIT;
+  LIBC_INLINE_VAR static constexpr int VALUE_LEN = INTEGRAL_LEN + FRACTION_LEN;
+  LIBC_INLINE_VAR static constexpr int TOTAL_LEN = SIGN_LEN + VALUE_LEN;
+
+  LIBC_INLINE static constexpr Type MIN() { return ULACCUM_MIN; }
+  LIBC_INLINE static constexpr Type MAX() { return ULACCUM_MAX; }
+  LIBC_INLINE static constexpr Type ZERO() { return 0.0ULK; }
+  LIBC_INLINE static constexpr Type EPS() { return ULACCUM_EPSILON; }
+  LIBC_INLINE static constexpr Type ONE_HALF() { return 0.5ULK; }
+  LIBC_INLINE static constexpr Type ONE_FOURTH() { return 0.25ULK; }
+
+  using StorageType = typename internal::Storage<TOTAL_LEN>::Type;
+  using CompType = cpp::make_unsigned_t<StorageType>;
+};
+
+template <> struct FXRep<short sat fract> : FXRep<short fract> {};
+template <> struct FXRep<sat fract> : FXRep<fract> {};
+template <> struct FXRep<long sat fract> : FXRep<long fract> {};
+template <>
+struct FXRep<unsigned short sat fract> : FXRep<unsigned short fract> {};
+template <> struct FXRep<unsigned sat fract> : FXRep<unsigned fract> {};
+template <>
+struct FXRep<unsigned long sat fract> : FXRep<unsigned long fract> {};
+
+template <> struct FXRep<short sat accum> : FXRep<short accum> {};
+template <> struct FXRep<sat accum> : FXRep<accum> {};
+template <> struct FXRep<long sat accum> : FXRep<long accum> {};
+template <>
+struct FXRep<unsigned short sat accum> : FXRep<unsigned short accum> {};
+template <> struct FXRep<unsigned sat accum> : FXRep<unsigned accum> {};
+template <>
+struct FXRep<unsigned long sat accum> : FXRep<unsigned long accum> {};
+
+} // namespace fixed_point
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LIBC_COMPILER_HAS_FIXED_POINT
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FIXED_POINT_FX_REP_H
diff --git a/contrib/llvm-project/libc/src/__support/fixed_point/sqrt.h b/contrib/llvm-project/libc/src/__support/fixed_point/sqrt.h
new file mode 100644
index 000000000000..b77319debeea
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/fixed_point/sqrt.h
@@ -0,0 +1,269 @@
+//===-- Calculate square root of fixed point numbers. -----*- C++ -*-=========//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FIXEDPOINT_SQRT_H
+#define LLVM_LIBC_SRC___SUPPORT_FIXEDPOINT_SQRT_H
+
+#include "include/llvm-libc-macros/stdfix-macros.h"
+#include "src/__support/CPP/bit.h"
+#include "src/__support/CPP/limits.h" // CHAR_BIT
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/macros/attributes.h"   // LIBC_INLINE
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
+
+#include "fx_rep.h"
+
+#ifdef LIBC_COMPILER_HAS_FIXED_POINT
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fixed_point {
+
+namespace internal {
+
+template <typename T> struct SqrtConfig;
+
+template <> struct SqrtConfig<unsigned short fract> {
+  using Type = unsigned short fract;
+  static constexpr int EXTRA_STEPS = 0;
+
+  // Linear approximation for the initial values, with errors bounded by:
+  //   max(1.5 * 2^-11, eps)
+  // Generated with Sollya:
+  // > for i from 4 to 15 do {
+  //     P = fpminimax(sqrt(x), 1, [|8, 8|], [i * 2^-4, (i + 1)*2^-4],
+  //                   fixed, absolute);
+  //     print("{", coeff(P, 1), "uhr,", coeff(P, 0), "uhr},");
+  //   };
+  static constexpr Type FIRST_APPROX[12][2] = {
+      {0x1.e8p-1uhr, 0x1.0cp-2uhr}, {0x1.bap-1uhr, 0x1.28p-2uhr},
+      {0x1.94p-1uhr, 0x1.44p-2uhr}, {0x1.74p-1uhr, 0x1.6p-2uhr},
+      {0x1.6p-1uhr, 0x1.74p-2uhr},  {0x1.4ep-1uhr, 0x1.88p-2uhr},
+      {0x1.3ep-1uhr, 0x1.9cp-2uhr}, {0x1.32p-1uhr, 0x1.acp-2uhr},
+      {0x1.22p-1uhr, 0x1.c4p-2uhr}, {0x1.18p-1uhr, 0x1.d4p-2uhr},
+      {0x1.08p-1uhr, 0x1.fp-2uhr},  {0x1.04p-1uhr, 0x1.f8p-2uhr},
+  };
+};
+
+template <> struct SqrtConfig<unsigned fract> {
+  using Type = unsigned fract;
+  static constexpr int EXTRA_STEPS = 1;
+
+  // Linear approximation for the initial values, with errors bounded by:
+  //   max(1.5 * 2^-11, eps)
+  // Generated with Sollya:
+  // > for i from 4 to 14 do {
+  //     P = fpminimax(sqrt(x), 1, [|16, 16|], [i * 2^-4, (i + 1)*2^-4],
+  //                   fixed, absolute);
+  //     print("{", coeff(P, 1), "ur,", coeff(P, 0), "ur},");
+  //   };
+  // For the last interval [15/16, 1), we choose the linear function Q such that
+  //   Q(1) = 1 and Q(15/16) = P(15/16),
+  // where P is the polynomial generated by Sollya above for [14/16, 15/16].
+  // This is to prevent overflow in the last interval [15/16, 1).
+  static constexpr Type FIRST_APPROX[12][2] = {
+      {0x1.e378p-1ur, 0x1.0ebp-2ur},  {0x1.b512p-1ur, 0x1.2b94p-2ur},
+      {0x1.91fp-1ur, 0x1.45dcp-2ur},  {0x1.7622p-1ur, 0x1.5e24p-2ur},
+      {0x1.5f5ap-1ur, 0x1.74e4p-2ur}, {0x1.4c58p-1ur, 0x1.8a4p-2ur},
+      {0x1.3c1ep-1ur, 0x1.9e84p-2ur}, {0x1.2e0cp-1ur, 0x1.b1d8p-2ur},
+      {0x1.21aap-1ur, 0x1.c468p-2ur}, {0x1.16bap-1ur, 0x1.d62cp-2ur},
+      {0x1.0cfp-1ur, 0x1.e74cp-2ur},  {0x1.039p-1ur, 0x1.f8ep-2ur},
+  };
+};
+
+template <> struct SqrtConfig<unsigned long fract> {
+  using Type = unsigned long fract;
+  static constexpr int EXTRA_STEPS = 2;
+
+  // Linear approximation for the initial values, with errors bounded by:
+  //   max(1.5 * 2^-11, eps)
+  // Generated with Sollya:
+  // > for i from 4 to 14 do {
+  //     P = fpminimax(sqrt(x), 1, [|32, 32|], [i * 2^-4, (i + 1)*2^-4],
+  //                   fixed, absolute);
+  //     print("{", coeff(P, 1), "ulr,", coeff(P, 0), "ulr},");
+  //   };
+  // For the last interval [15/16, 1), we choose the linear function Q such that
+  //   Q(1) = 1 and Q(15/16) = P(15/16),
+  // where P is the polynomial generated by Sollya above for [14/16, 15/16].
+  // This is to prevent overflow in the last interval [15/16, 1).
+  static constexpr Type FIRST_APPROX[12][2] = {
+      {0x1.e3779b98p-1ulr, 0x1.0eaff788p-2ulr},
+      {0x1.b5167872p-1ulr, 0x1.2b908ad4p-2ulr},
+      {0x1.91f195cap-1ulr, 0x1.45da800cp-2ulr},
+      {0x1.761ebcb4p-1ulr, 0x1.5e27004cp-2ulr},
+      {0x1.5f619986p-1ulr, 0x1.74db933cp-2ulr},
+      {0x1.4c583adep-1ulr, 0x1.8a3fbfccp-2ulr},
+      {0x1.3c1a591cp-1ulr, 0x1.9e88373cp-2ulr},
+      {0x1.2e08545ap-1ulr, 0x1.b1dd2534p-2ulr},
+      {0x1.21b05c0ap-1ulr, 0x1.c45e023p-2ulr},
+      {0x1.16becd02p-1ulr, 0x1.d624031p-2ulr},
+      {0x1.0cf49fep-1ulr, 0x1.e743b844p-2ulr},
+      {0x1.038cdfcp-1ulr, 0x1.f8e6408p-2ulr},
+  };
+};
+
+template <>
+struct SqrtConfig<unsigned short accum> : SqrtConfig<unsigned fract> {};
+
+template <>
+struct SqrtConfig<unsigned accum> : SqrtConfig<unsigned long fract> {};
+
+// Integer square root
+template <> struct SqrtConfig<unsigned short> {
+  using OutType = unsigned short accum;
+  using FracType = unsigned fract;
+  // For fast-but-less-accurate version
+  using FastFracType = unsigned short fract;
+  using HalfType = unsigned char;
+};
+
+template <> struct SqrtConfig<unsigned int> {
+  using OutType = unsigned accum;
+  using FracType = unsigned long fract;
+  // For fast-but-less-accurate version
+  using FastFracType = unsigned fract;
+  using HalfType = unsigned short;
+};
+
+// TODO: unsigned long accum type is 64-bit, and will need 64-bit fract type.
+// Probably we will use DyadicFloat<64> for intermediate computations instead.
+
+} // namespace internal
+
+// Core computation for sqrt with normalized inputs (0.25 <= x < 1).
+template <typename Config>
+LIBC_INLINE constexpr typename Config::Type
+sqrt_core(typename Config::Type x_frac) {
+  using FracType = typename Config::Type;
+  using FXRep = FXRep<FracType>;
+  using StorageType = typename FXRep::StorageType;
+  // Exact case:
+  if (x_frac == FXRep::ONE_FOURTH())
+    return FXRep::ONE_HALF();
+
+  // Use use Newton method to approximate sqrt(a):
+  //   x_{n + 1} = 1/2 (x_n + a / x_n)
+  // For the initial values, we choose x_0
+
+  // Use the leading 4 bits to do look up for sqrt(x).
+  // After normalization, 0.25 <= x_frac < 1, so the leading 4 bits of x_frac
+  // are between 0b0100 and 0b1111.  Hence the lookup table only needs 12
+  // entries, and we can get the index by subtracting the leading 4 bits of
+  // x_frac by 4 = 0b0100.
+  StorageType x_bit = cpp::bit_cast<StorageType>(x_frac);
+  int index = (static_cast<int>(x_bit >> (FXRep::TOTAL_LEN - 4))) - 4;
+  FracType a = Config::FIRST_APPROX[index][0];
+  FracType b = Config::FIRST_APPROX[index][1];
+
+  // Initial approximation step.
+  // Estimated error bounds: | r - sqrt(x_frac) | < max(1.5 * 2^-11, eps).
+  FracType r = a * x_frac + b;
+
+  // Further Newton-method iterations for square-root:
+  //   x_{n + 1} = 0.5 * (x_n + a / x_n)
+  // We distribute and do the multiplication by 0.5 first to avoid overflow.
+  // TODO: Investigate the performance and accuracy of using division-free
+  // iterations from:
+  //   Blanchard, J. D. and Chamberland, M., "Newton's Method Without Division",
+  //   The American Mathematical Monthly (2023).
+  //   https://chamberland.math.grinnell.edu/papers/newton.pdf
+  for (int i = 0; i < Config::EXTRA_STEPS; ++i)
+    r = (r >> 1) + (x_frac >> 1) / r;
+
+  return r;
+}
+
+template <typename T>
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_fixed_point_v<T>, T> sqrt(T x) {
+  using BitType = typename FXRep<T>::StorageType;
+  BitType x_bit = cpp::bit_cast<BitType>(x);
+
+  if (LIBC_UNLIKELY(x_bit == 0))
+    return FXRep<T>::ZERO();
+
+  int leading_zeros = cpp::countl_zero(x_bit);
+  constexpr int STORAGE_LENGTH = sizeof(BitType) * CHAR_BIT;
+  constexpr int EXP_ADJUSTMENT = STORAGE_LENGTH - FXRep<T>::FRACTION_LEN - 1;
+  // x_exp is the real exponent of the leading bit of x.
+  int x_exp = EXP_ADJUSTMENT - leading_zeros;
+  int shift = EXP_ADJUSTMENT - 1 - (x_exp & (~1));
+  // Normalize.
+  x_bit <<= shift;
+  using FracType = typename internal::SqrtConfig<T>::Type;
+  FracType x_frac = cpp::bit_cast<FracType>(x_bit);
+
+  // Compute sqrt(x_frac) using Newton-method.
+  FracType r = sqrt_core<internal::SqrtConfig<T>>(x_frac);
+
+  // Re-scaling
+  r >>= EXP_ADJUSTMENT - (x_exp >> 1);
+
+  // Return result.
+  return cpp::bit_cast<T>(r);
+}
+
+// Integer square root - Accurate version:
+// Absolute errors < 2^(-fraction length).
+template <typename T>
+LIBC_INLINE constexpr typename internal::SqrtConfig<T>::OutType isqrt(T x) {
+  using OutType = typename internal::SqrtConfig<T>::OutType;
+  using FracType = typename internal::SqrtConfig<T>::FracType;
+
+  if (x == 0)
+    return FXRep<OutType>::ZERO();
+
+  // Normalize the leading bits to the first two bits.
+  // Shift and then Bit cast x to x_frac gives us:
+  //   x = 2^(FRACTION_LEN + 1 - shift) * x_frac;
+  int leading_zeros = cpp::countl_zero(x);
+  int shift = ((leading_zeros >> 1) << 1);
+  x <<= shift;
+  // Convert to frac type and compute square root.
+  FracType x_frac = cpp::bit_cast<FracType>(x);
+  FracType r = sqrt_core<internal::SqrtConfig<FracType>>(x_frac);
+  // To rescale back to the OutType (Accum)
+  r >>= (shift >> 1);
+
+  return cpp::bit_cast<OutType>(r);
+}
+
+// Integer square root - Fast but less accurate version:
+// Relative errors < 2^(-fraction length).
+template <typename T>
+LIBC_INLINE constexpr typename internal::SqrtConfig<T>::OutType
+isqrt_fast(T x) {
+  using OutType = typename internal::SqrtConfig<T>::OutType;
+  using FracType = typename internal::SqrtConfig<T>::FastFracType;
+  using StorageType = typename FXRep<FracType>::StorageType;
+
+  if (x == 0)
+    return FXRep<OutType>::ZERO();
+
+  // Normalize the leading bits to the first two bits.
+  // Shift and then Bit cast x to x_frac gives us:
+  //   x = 2^(FRACTION_LEN + 1 - shift) * x_frac;
+  int leading_zeros = cpp::countl_zero(x);
+  int shift = (leading_zeros & (~1));
+  x <<= shift;
+  // Convert to frac type and compute square root.
+  FracType x_frac = cpp::bit_cast<FracType>(
+      static_cast<StorageType>(x >> FXRep<FracType>::FRACTION_LEN));
+  OutType r =
+      static_cast<OutType>(sqrt_core<internal::SqrtConfig<FracType>>(x_frac));
+  // To rescale back to the OutType (Accum)
+  r <<= (FXRep<OutType>::INTEGRAL_LEN - (shift >> 1));
+  return cpp::bit_cast<OutType>(r);
+}
+
+} // namespace fixed_point
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LIBC_COMPILER_HAS_FIXED_POINT
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FIXEDPOINT_SQRT_H
diff --git a/contrib/llvm-project/libc/src/__support/fixedvector.h b/contrib/llvm-project/libc/src/__support/fixedvector.h
new file mode 100644
index 000000000000..34601f86dc01
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/fixedvector.h
@@ -0,0 +1,127 @@
+//===-- A data structure for a fixed capacity data store --------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FIXEDVECTOR_H
+#define LLVM_LIBC_SRC___SUPPORT_FIXEDVECTOR_H
+
+#include "src/__support/CPP/array.h"
+#include "src/__support/CPP/iterator.h"
+#include "src/__support/libc_assert.h"
+#include "src/__support/macros/config.h"
+#include "src/string/memory_utils/inline_memset.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+// A fixed size data store backed by an underlying cpp::array data structure. It
+// supports vector like API but is not resizable like a vector.
+template <typename T, size_t CAPACITY> class FixedVector {
+  cpp::array<T, CAPACITY> store;
+  size_t item_count = 0;
+
+public:
+  LIBC_INLINE constexpr FixedVector() = default;
+
+  using iterator = typename cpp::array<T, CAPACITY>::iterator;
+  LIBC_INLINE constexpr FixedVector(iterator begin, iterator end)
+      : store{}, item_count{} {
+    LIBC_ASSERT(begin + CAPACITY >= end);
+    for (; begin != end; ++begin)
+      push_back(*begin);
+  }
+
+  using const_iterator = typename cpp::array<T, CAPACITY>::const_iterator;
+  LIBC_INLINE constexpr FixedVector(const_iterator begin, const_iterator end)
+      : store{}, item_count{} {
+    LIBC_ASSERT(begin + CAPACITY >= end);
+    for (; begin != end; ++begin)
+      push_back(*begin);
+  }
+
+  LIBC_INLINE constexpr FixedVector(size_t count, const T &value)
+      : store{}, item_count{} {
+    LIBC_ASSERT(count <= CAPACITY);
+    for (size_t i = 0; i < count; ++i)
+      push_back(value);
+  }
+
+  LIBC_INLINE constexpr bool push_back(const T &obj) {
+    if (item_count == CAPACITY)
+      return false;
+    store[item_count] = obj;
+    ++item_count;
+    return true;
+  }
+
+  LIBC_INLINE constexpr const T &back() const {
+    LIBC_ASSERT(!empty());
+    return store[item_count - 1];
+  }
+
+  LIBC_INLINE constexpr T &back() {
+    LIBC_ASSERT(!empty());
+    return store[item_count - 1];
+  }
+
+  LIBC_INLINE constexpr bool pop_back() {
+    if (item_count == 0)
+      return false;
+    inline_memset(&store[item_count - 1], 0, sizeof(T));
+    --item_count;
+    return true;
+  }
+
+  LIBC_INLINE constexpr T &operator[](size_t idx) {
+    LIBC_ASSERT(idx < item_count);
+    return store[idx];
+  }
+
+  LIBC_INLINE constexpr const T &operator[](size_t idx) const {
+    LIBC_ASSERT(idx < item_count);
+    return store[idx];
+  }
+
+  LIBC_INLINE constexpr bool empty() const { return item_count == 0; }
+
+  LIBC_INLINE constexpr size_t size() const { return item_count; }
+
+  // Empties the store for all practical purposes.
+  LIBC_INLINE constexpr void reset() {
+    inline_memset(store.data(), 0, sizeof(T) * item_count);
+    item_count = 0;
+  }
+
+  // This static method does not free up the resources held by |store|,
+  // say by calling `free` or something similar. It just does the equivalent
+  // of the `reset` method. Considering that FixedVector is of fixed storage,
+  // a `destroy` method like this should not be required. However, FixedVector
+  // is used in a few places as an alternate for data structures which use
+  // dynamically allocated storate. So, the `destroy` method like this
+  // matches the `destroy` API of those other data structures so that users
+  // can easily swap one data structure for the other.
+  LIBC_INLINE static void destroy(FixedVector<T, CAPACITY> *store) {
+    store->reset();
+  }
+
+  using reverse_iterator = typename cpp::array<T, CAPACITY>::reverse_iterator;
+  LIBC_INLINE constexpr reverse_iterator rbegin() {
+    return reverse_iterator{&store[item_count]};
+  }
+  LIBC_INLINE constexpr reverse_iterator rend() { return store.rend(); }
+
+  LIBC_INLINE constexpr iterator begin() { return store.begin(); }
+  LIBC_INLINE constexpr iterator end() { return iterator{&store[item_count]}; }
+
+  LIBC_INLINE constexpr const_iterator begin() const { return store.begin(); }
+  LIBC_INLINE constexpr const_iterator end() const {
+    return const_iterator{&store[item_count]};
+  }
+};
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FIXEDVECTOR_H
diff --git a/contrib/llvm-project/libc/src/__support/float_to_string.h b/contrib/llvm-project/libc/src/__support/float_to_string.h
new file mode 100644
index 000000000000..d88bf844b15a
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/float_to_string.h
@@ -0,0 +1,837 @@
+//===-- Utilities to convert floating point values to string ----*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FLOAT_TO_STRING_H
+#define LLVM_LIBC_SRC___SUPPORT_FLOAT_TO_STRING_H
+
+#include <stdint.h>
+
+#include "src/__support/CPP/limits.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/FPUtil/dyadic_float.h"
+#include "src/__support/big_int.h"
+#include "src/__support/common.h"
+#include "src/__support/libc_assert.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/sign.h"
+
+// This file has 5 compile-time flags to allow the user to configure the float
+// to string behavior. These were used to explore tradeoffs during the design
+// phase, and can still be used to gain specific properties. Unless you
+// specifically know what you're doing, you should leave all these flags off.
+
+// LIBC_COPT_FLOAT_TO_STR_NO_SPECIALIZE_LD
+//  This flag disables the separate long double conversion implementation. It is
+//  not based on the Ryu algorithm, instead generating the digits by
+//  multiplying/dividing the written-out number by 10^9 to get blocks. It's
+//  significantly faster than INT_CALC, only about 10x slower than MEGA_TABLE,
+//  and is small in binary size. Its downside is that it always calculates all
+//  of the digits above the decimal point, making it inefficient for %e calls
+//  with large exponents. This specialization overrides other flags, so this
+//  flag must be set for other flags to effect the long double behavior.
+
+// LIBC_COPT_FLOAT_TO_STR_USE_MEGA_LONG_DOUBLE_TABLE
+//  The Mega Table is ~5 megabytes when compiled. It lists the constants needed
+//  to perform the Ryu Printf algorithm (described below) for all long double
+//  values. This makes it extremely fast for both doubles and long doubles, in
+//  exchange for large binary size.
+
+// LIBC_COPT_FLOAT_TO_STR_USE_DYADIC_FLOAT
+//  Dyadic floats are software floating point numbers, and their accuracy can be
+//  as high as necessary. This option uses 256 bit dyadic floats to calculate
+//  the table values that Ryu Printf needs. This is reasonably fast and very
+//  small compared to the Mega Table, but the 256 bit floats only give accurate
+//  results for the first ~50 digits of the output. In practice this shouldn't
+//  be a problem since long doubles are only accurate for ~35 digits, but the
+//  trailing values all being 0s may cause brittle tests to fail.
+
+// LIBC_COPT_FLOAT_TO_STR_USE_INT_CALC
+//  Integer Calculation uses wide integers to do the calculations for the Ryu
+//  Printf table, which is just as accurate as the Mega Table without requiring
+//  as much code size. These integers can be very large (~32KB at max, though
+//  always on the stack) to handle the edges of the long double range. They are
+//  also very slow, taking multiple seconds on a powerful CPU to calculate the
+//  values at the end of the range. If no flag is set, this is used for long
+//  doubles, the flag only changes the double behavior.
+
+// LIBC_COPT_FLOAT_TO_STR_NO_TABLE
+//  This flag doesn't change the actual calculation method, instead it is used
+//  to disable the normal Ryu Printf table for configurations that don't use any
+//  table at all.
+
+// Default Config:
+//  If no flags are set, doubles use the normal (and much more reasonably sized)
+//  Ryu Printf table and long doubles use their specialized implementation. This
+//  provides good performance and binary size.
+
+#ifdef LIBC_COPT_FLOAT_TO_STR_USE_MEGA_LONG_DOUBLE_TABLE
+#include "src/__support/ryu_long_double_constants.h"
+#elif !defined(LIBC_COPT_FLOAT_TO_STR_NO_TABLE)
+#include "src/__support/ryu_constants.h"
+#else
+constexpr size_t IDX_SIZE = 1;
+constexpr size_t MID_INT_SIZE = 192;
+#endif
+
+// This implementation is based on the Ryu Printf algorithm by Ulf Adams:
+// Ulf Adams. 2019. Ryū revisited: printf floating point conversion.
+// Proc. ACM Program. Lang. 3, OOPSLA, Article 169 (October 2019), 23 pages.
+// https://doi.org/10.1145/3360595
+
+// This version is modified to require significantly less memory (it doesn't use
+// a large buffer to store the result).
+
+// The general concept of this algorithm is as follows:
+// We want to calculate a 9 digit segment of a floating point number using this
+// formula: floor((mantissa * 2^exponent)/10^i) % 10^9.
+// To do so normally would involve large integers (~1000 bits for doubles), so
+// we use a shortcut. We can avoid calculating 2^exponent / 10^i by using a
+// lookup table. The resulting intermediate value needs to be about 192 bits to
+// store the result with enough precision. Since this is all being done with
+// integers for appropriate precision, we would run into a problem if
+// i > exponent since then 2^exponent / 10^i would be less than 1. To correct
+// for this, the actual calculation done is 2^(exponent + c) / 10^i, and then
+// when multiplying by the mantissa we reverse this by dividing by 2^c, like so:
+// floor((mantissa * table[exponent][i])/(2^c)) % 10^9.
+// This gives a 9 digit value, which is small enough to fit in a 32 bit integer,
+// and that integer is converted into a string as normal, and called a block. In
+// this implementation, the most recent block is buffered, so that if rounding
+// is necessary the block can be adjusted before being written to the output.
+// Any block that is all 9s adds one to the max block counter and doesn't clear
+// the buffer because they can cause the block above them to be rounded up.
+
+namespace LIBC_NAMESPACE_DECL {
+
+using BlockInt = uint32_t;
+constexpr uint32_t BLOCK_SIZE = 9;
+constexpr uint64_t EXP5_9 = 1953125;
+constexpr uint64_t EXP10_9 = 1000000000;
+
+using FPBits = fputil::FPBits<long double>;
+
+// Larger numbers prefer a slightly larger constant than is used for the smaller
+// numbers.
+constexpr size_t CALC_SHIFT_CONST = 128;
+
+namespace internal {
+
+// Returns floor(log_10(2^e)); requires 0 <= e <= 42039.
+LIBC_INLINE constexpr uint32_t log10_pow2(uint64_t e) {
+  LIBC_ASSERT(e <= 42039 &&
+              "Incorrect exponent to perform log10_pow2 approximation.");
+  // This approximation is based on the float value for log_10(2). It first
+  // gives an incorrect result for our purposes at 42039 (well beyond the 16383
+  // maximum for long doubles).
+
+  // To get these constants I first evaluated log_10(2) to get an approximation
+  // of 0.301029996. Next I passed that value through a string to double
+  // conversion to get an explicit mantissa of 0x13441350fbd738 and an exponent
+  // of -2 (which becomes -54 when we shift the mantissa to be a non-fractional
+  // number). Next I shifted the mantissa right 12 bits to create more space for
+  // the multiplication result, adding 12 to the exponent to compensate. To
+  // check that this approximation works for our purposes I used the following
+  // python code:
+  // for i in range(16384):
+  //   if(len(str(2**i)) != (((i*0x13441350fbd)>>42)+1)):
+  //     print(i)
+  // The reason we add 1 is because this evaluation truncates the result, giving
+  // us the floor, whereas counting the digits of the power of 2 gives us the
+  // ceiling. With a similar loop I checked the maximum valid value and found
+  // 42039.
+  return static_cast<uint32_t>((e * 0x13441350fbdll) >> 42);
+}
+
+// Same as above, but with different constants.
+LIBC_INLINE constexpr uint32_t log2_pow5(uint64_t e) {
+  return static_cast<uint32_t>((e * 0x12934f0979bll) >> 39);
+}
+
+// Returns 1 + floor(log_10(2^e). This could technically be off by 1 if any
+// power of 2 was also a power of 10, but since that doesn't exist this is
+// always accurate. This is used to calculate the maximum number of base-10
+// digits a given e-bit number could have.
+LIBC_INLINE constexpr uint32_t ceil_log10_pow2(uint32_t e) {
+  return log10_pow2(e) + 1;
+}
+
+LIBC_INLINE constexpr uint32_t div_ceil(uint32_t num, uint32_t denom) {
+  return (num + (denom - 1)) / denom;
+}
+
+// Returns the maximum number of 9 digit blocks a number described by the given
+// index (which is ceil(exponent/16)) and mantissa width could need.
+LIBC_INLINE constexpr uint32_t length_for_num(uint32_t idx,
+                                              uint32_t mantissa_width) {
+  return div_ceil(ceil_log10_pow2(idx) + ceil_log10_pow2(mantissa_width + 1),
+                  BLOCK_SIZE);
+}
+
+// The formula for the table when i is positive (or zero) is as follows:
+// floor(10^(-9i) * 2^(e + c_1) + 1) % (10^9 * 2^c_1)
+// Rewritten slightly we get:
+// floor(5^(-9i) * 2^(e + c_1 - 9i) + 1) % (10^9 * 2^c_1)
+
+// TODO: Fix long doubles (needs bigger table or alternate algorithm.)
+// Currently the table values are generated, which is very slow.
+template <size_t INT_SIZE>
+LIBC_INLINE constexpr UInt<MID_INT_SIZE> get_table_positive(int exponent,
+                                                            size_t i) {
+  // INT_SIZE is the size of int that is used for the internal calculations of
+  // this function. It should be large enough to hold 2^(exponent+constant), so
+  // ~1000 for double and ~16000 for long double. Be warned that the time
+  // complexity of exponentiation is O(n^2 * log_2(m)) where n is the number of
+  // bits in the number being exponentiated and m is the exponent.
+  const int shift_amount =
+      static_cast<int>(exponent + CALC_SHIFT_CONST - (BLOCK_SIZE * i));
+  if (shift_amount < 0) {
+    return 1;
+  }
+  UInt<INT_SIZE> num(0);
+  // MOD_SIZE is one of the limiting factors for how big the constant argument
+  // can get, since it needs to be small enough to fit in the result UInt,
+  // otherwise we'll get truncation on return.
+  constexpr UInt<INT_SIZE> MOD_SIZE =
+      (UInt<INT_SIZE>(EXP10_9)
+       << (CALC_SHIFT_CONST + (IDX_SIZE > 1 ? IDX_SIZE : 0)));
+
+  num = UInt<INT_SIZE>(1) << (shift_amount);
+  if (i > 0) {
+    UInt<INT_SIZE> fives(EXP5_9);
+    fives.pow_n(i);
+    num = num / fives;
+  }
+
+  num = num + 1;
+  if (num > MOD_SIZE) {
+    auto rem = num.div_uint_half_times_pow_2(
+                      EXP10_9, CALC_SHIFT_CONST + (IDX_SIZE > 1 ? IDX_SIZE : 0))
+                   .value();
+    num = rem;
+  }
+  return num;
+}
+
+template <size_t INT_SIZE>
+LIBC_INLINE UInt<MID_INT_SIZE> get_table_positive_df(int exponent, size_t i) {
+  static_assert(INT_SIZE == 256,
+                "Only 256 is supported as an int size right now.");
+  // This version uses dyadic floats with 256 bit mantissas to perform the same
+  // calculation as above. Due to floating point imprecision it is only accurate
+  // for the first 50 digits, but it's much faster. Since even 128 bit long
+  // doubles are only accurate to ~35 digits, the 50 digits of accuracy are
+  // enough for these floats to be converted back and forth safely. This is
+  // ideal for avoiding the size of the long double table.
+  const int shift_amount =
+      static_cast<int>(exponent + CALC_SHIFT_CONST - (9 * i));
+  if (shift_amount < 0) {
+    return 1;
+  }
+  fputil::DyadicFloat<INT_SIZE> num(Sign::POS, 0, 1);
+  constexpr UInt<INT_SIZE> MOD_SIZE =
+      (UInt<INT_SIZE>(EXP10_9)
+       << (CALC_SHIFT_CONST + (IDX_SIZE > 1 ? IDX_SIZE : 0)));
+
+  constexpr UInt<INT_SIZE> FIVE_EXP_MINUS_NINE_MANT{
+      {0xf387295d242602a7, 0xfdd7645e011abac9, 0x31680a88f8953030,
+       0x89705f4136b4a597}};
+
+  static const fputil::DyadicFloat<INT_SIZE> FIVE_EXP_MINUS_NINE(
+      Sign::POS, -276, FIVE_EXP_MINUS_NINE_MANT);
+
+  if (i > 0) {
+    fputil::DyadicFloat<INT_SIZE> fives =
+        fputil::pow_n(FIVE_EXP_MINUS_NINE, static_cast<uint32_t>(i));
+    num = fives;
+  }
+  num = mul_pow_2(num, shift_amount);
+
+  // Adding one is part of the formula.
+  UInt<INT_SIZE> int_num = num.as_mantissa_type() + 1;
+  if (int_num > MOD_SIZE) {
+    auto rem =
+        int_num
+            .div_uint_half_times_pow_2(
+                EXP10_9, CALC_SHIFT_CONST + (IDX_SIZE > 1 ? IDX_SIZE : 0))
+            .value();
+    int_num = rem;
+  }
+
+  UInt<MID_INT_SIZE> result = int_num;
+
+  return result;
+}
+
+// The formula for the table when i is negative (or zero) is as follows:
+// floor(10^(-9i) * 2^(c_0 - e)) % (10^9 * 2^c_0)
+// Since we know i is always negative, we just take it as unsigned and treat it
+// as negative. We do the same with exponent, while they're both always negative
+// in theory, in practice they're converted to positive for simpler
+// calculations.
+// The formula being used looks more like this:
+// floor(10^(9*(-i)) * 2^(c_0 + (-e))) % (10^9 * 2^c_0)
+template <size_t INT_SIZE>
+LIBC_INLINE UInt<MID_INT_SIZE> get_table_negative(int exponent, size_t i) {
+  int shift_amount = CALC_SHIFT_CONST - exponent;
+  UInt<INT_SIZE> num(1);
+  constexpr UInt<INT_SIZE> MOD_SIZE =
+      (UInt<INT_SIZE>(EXP10_9)
+       << (CALC_SHIFT_CONST + (IDX_SIZE > 1 ? IDX_SIZE : 0)));
+
+  size_t ten_blocks = i;
+  size_t five_blocks = 0;
+  if (shift_amount < 0) {
+    int block_shifts = (-shift_amount) / static_cast<int>(BLOCK_SIZE);
+    if (block_shifts < static_cast<int>(ten_blocks)) {
+      ten_blocks = ten_blocks - block_shifts;
+      five_blocks = block_shifts;
+      shift_amount = shift_amount + (block_shifts * BLOCK_SIZE);
+    } else {
+      ten_blocks = 0;
+      five_blocks = i;
+      shift_amount = shift_amount + (static_cast<int>(i) * BLOCK_SIZE);
+    }
+  }
+
+  if (five_blocks > 0) {
+    UInt<INT_SIZE> fives(EXP5_9);
+    fives.pow_n(five_blocks);
+    num = fives;
+  }
+  if (ten_blocks > 0) {
+    UInt<INT_SIZE> tens(EXP10_9);
+    tens.pow_n(ten_blocks);
+    if (five_blocks <= 0) {
+      num = tens;
+    } else {
+      num *= tens;
+    }
+  }
+
+  if (shift_amount > 0) {
+    num = num << shift_amount;
+  } else {
+    num = num >> (-shift_amount);
+  }
+  if (num > MOD_SIZE) {
+    auto rem = num.div_uint_half_times_pow_2(
+                      EXP10_9, CALC_SHIFT_CONST + (IDX_SIZE > 1 ? IDX_SIZE : 0))
+                   .value();
+    num = rem;
+  }
+  return num;
+}
+
+template <size_t INT_SIZE>
+LIBC_INLINE UInt<MID_INT_SIZE> get_table_negative_df(int exponent, size_t i) {
+  static_assert(INT_SIZE == 256,
+                "Only 256 is supported as an int size right now.");
+  // This version uses dyadic floats with 256 bit mantissas to perform the same
+  // calculation as above. Due to floating point imprecision it is only accurate
+  // for the first 50 digits, but it's much faster. Since even 128 bit long
+  // doubles are only accurate to ~35 digits, the 50 digits of accuracy are
+  // enough for these floats to be converted back and forth safely. This is
+  // ideal for avoiding the size of the long double table.
+
+  int shift_amount = CALC_SHIFT_CONST - exponent;
+
+  fputil::DyadicFloat<INT_SIZE> num(Sign::POS, 0, 1);
+  constexpr UInt<INT_SIZE> MOD_SIZE =
+      (UInt<INT_SIZE>(EXP10_9)
+       << (CALC_SHIFT_CONST + (IDX_SIZE > 1 ? IDX_SIZE : 0)));
+
+  constexpr UInt<INT_SIZE> TEN_EXP_NINE_MANT(EXP10_9);
+
+  static const fputil::DyadicFloat<INT_SIZE> TEN_EXP_NINE(Sign::POS, 0,
+                                                          TEN_EXP_NINE_MANT);
+
+  if (i > 0) {
+    fputil::DyadicFloat<INT_SIZE> tens =
+        fputil::pow_n(TEN_EXP_NINE, static_cast<uint32_t>(i));
+    num = tens;
+  }
+  num = mul_pow_2(num, shift_amount);
+
+  UInt<INT_SIZE> int_num = num.as_mantissa_type();
+  if (int_num > MOD_SIZE) {
+    auto rem =
+        int_num
+            .div_uint_half_times_pow_2(
+                EXP10_9, CALC_SHIFT_CONST + (IDX_SIZE > 1 ? IDX_SIZE : 0))
+            .value();
+    int_num = rem;
+  }
+
+  UInt<MID_INT_SIZE> result = int_num;
+
+  return result;
+}
+
+LIBC_INLINE uint32_t mul_shift_mod_1e9(const FPBits::StorageType mantissa,
+                                       const UInt<MID_INT_SIZE> &large,
+                                       const int32_t shift_amount) {
+  // make sure the number of bits is always divisible by 64
+  UInt<internal::div_ceil(MID_INT_SIZE + FPBits::STORAGE_LEN, 64) * 64> val(
+      large);
+  val = (val * mantissa) >> shift_amount;
+  return static_cast<uint32_t>(
+      val.div_uint_half_times_pow_2(static_cast<uint32_t>(EXP10_9), 0).value());
+}
+
+} // namespace internal
+
+// Convert floating point values to their string representation.
+// Because the result may not fit in a reasonably sized array, the caller must
+// request blocks of digits and convert them from integers to strings themself.
+// Blocks contain the most digits that can be stored in an BlockInt. This is 9
+// digits for a 32 bit int and 18 digits for a 64 bit int.
+// The intended use pattern is to create a FloatToString object of the
+// appropriate type, then call get_positive_blocks to get an approximate number
+// of blocks there are before the decimal point. Now the client code can start
+// calling get_positive_block in a loop from the number of positive blocks to
+// zero. This will give all digits before the decimal point. Then the user can
+// start calling get_negative_block in a loop from 0 until the number of digits
+// they need is reached. As an optimization, the client can use
+// zero_blocks_after_point to find the number of blocks that are guaranteed to
+// be zero after the decimal point and before the non-zero digits. Additionally,
+// is_lowest_block will return if the current block is the lowest non-zero
+// block.
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+class FloatToString {
+  fputil::FPBits<T> float_bits;
+  int exponent;
+  FPBits::StorageType mantissa;
+
+  static constexpr int FRACTION_LEN = fputil::FPBits<T>::FRACTION_LEN;
+  static constexpr int EXP_BIAS = fputil::FPBits<T>::EXP_BIAS;
+
+public:
+  LIBC_INLINE constexpr FloatToString(T init_float) : float_bits(init_float) {
+    exponent = float_bits.get_explicit_exponent();
+    mantissa = float_bits.get_explicit_mantissa();
+
+    // Adjust for the width of the mantissa.
+    exponent -= FRACTION_LEN;
+  }
+
+  LIBC_INLINE constexpr bool is_nan() { return float_bits.is_nan(); }
+  LIBC_INLINE constexpr bool is_inf() { return float_bits.is_inf(); }
+  LIBC_INLINE constexpr bool is_inf_or_nan() {
+    return float_bits.is_inf_or_nan();
+  }
+
+  // get_block returns an integer that represents the digits in the requested
+  // block.
+  LIBC_INLINE constexpr BlockInt get_positive_block(int block_index) {
+    if (exponent >= -FRACTION_LEN) {
+      // idx is ceil(exponent/16) or 0 if exponent is negative. This is used to
+      // find the coarse section of the POW10_SPLIT table that will be used to
+      // calculate the 9 digit window, as well as some other related values.
+      const uint32_t idx =
+          exponent < 0
+              ? 0
+              : static_cast<uint32_t>(exponent + (IDX_SIZE - 1)) / IDX_SIZE;
+
+      // shift_amount = -(c0 - exponent) = c_0 + 16 * ceil(exponent/16) -
+      // exponent
+
+      const uint32_t pos_exp = idx * IDX_SIZE;
+
+      UInt<MID_INT_SIZE> val;
+
+#if defined(LIBC_COPT_FLOAT_TO_STR_USE_DYADIC_FLOAT)
+      // ----------------------- DYADIC FLOAT CALC MODE ------------------------
+      const int32_t SHIFT_CONST = CALC_SHIFT_CONST;
+      val = internal::get_table_positive_df<256>(IDX_SIZE * idx, block_index);
+#elif defined(LIBC_COPT_FLOAT_TO_STR_USE_INT_CALC)
+
+      // ---------------------------- INT CALC MODE ----------------------------
+      const int32_t SHIFT_CONST = CALC_SHIFT_CONST;
+      const uint64_t MAX_POW_2_SIZE =
+          pos_exp + CALC_SHIFT_CONST - (BLOCK_SIZE * block_index);
+      const uint64_t MAX_POW_5_SIZE =
+          internal::log2_pow5(BLOCK_SIZE * block_index);
+      const uint64_t MAX_INT_SIZE =
+          (MAX_POW_2_SIZE > MAX_POW_5_SIZE) ? MAX_POW_2_SIZE : MAX_POW_5_SIZE;
+
+      if (MAX_INT_SIZE < 1024) {
+        val = internal::get_table_positive<1024>(pos_exp, block_index);
+      } else if (MAX_INT_SIZE < 2048) {
+        val = internal::get_table_positive<2048>(pos_exp, block_index);
+      } else if (MAX_INT_SIZE < 4096) {
+        val = internal::get_table_positive<4096>(pos_exp, block_index);
+      } else if (MAX_INT_SIZE < 8192) {
+        val = internal::get_table_positive<8192>(pos_exp, block_index);
+      } else if (MAX_INT_SIZE < 16384) {
+        val = internal::get_table_positive<16384>(pos_exp, block_index);
+      } else {
+        val = internal::get_table_positive<16384 + 128>(pos_exp, block_index);
+      }
+#else
+      // ----------------------------- TABLE MODE ------------------------------
+      const int32_t SHIFT_CONST = TABLE_SHIFT_CONST;
+
+      val = POW10_SPLIT[POW10_OFFSET[idx] + block_index];
+#endif
+      const uint32_t shift_amount = SHIFT_CONST + pos_exp - exponent;
+
+      const BlockInt digits =
+          internal::mul_shift_mod_1e9(mantissa, val, (int32_t)(shift_amount));
+      return digits;
+    } else {
+      return 0;
+    }
+  }
+
+  LIBC_INLINE constexpr BlockInt get_negative_block(int block_index) {
+    if (exponent < 0) {
+      const int32_t idx = -exponent / static_cast<int32_t>(IDX_SIZE);
+
+      UInt<MID_INT_SIZE> val;
+
+      const uint32_t pos_exp = static_cast<uint32_t>(idx * IDX_SIZE);
+
+#if defined(LIBC_COPT_FLOAT_TO_STR_USE_DYADIC_FLOAT)
+      // ----------------------- DYADIC FLOAT CALC MODE ------------------------
+      const int32_t SHIFT_CONST = CALC_SHIFT_CONST;
+      val = internal::get_table_negative_df<256>(pos_exp, block_index + 1);
+#elif defined(LIBC_COPT_FLOAT_TO_STR_USE_INT_CALC)
+      // ---------------------------- INT CALC MODE ----------------------------
+      const int32_t SHIFT_CONST = CALC_SHIFT_CONST;
+
+      const uint64_t NUM_FIVES = (block_index + 1) * BLOCK_SIZE;
+      // Round MAX_INT_SIZE up to the nearest 64 (adding 1 because log2_pow5
+      // implicitly rounds down).
+      const uint64_t MAX_INT_SIZE =
+          ((internal::log2_pow5(NUM_FIVES) / 64) + 1) * 64;
+
+      if (MAX_INT_SIZE < 1024) {
+        val = internal::get_table_negative<1024>(pos_exp, block_index + 1);
+      } else if (MAX_INT_SIZE < 2048) {
+        val = internal::get_table_negative<2048>(pos_exp, block_index + 1);
+      } else if (MAX_INT_SIZE < 4096) {
+        val = internal::get_table_negative<4096>(pos_exp, block_index + 1);
+      } else if (MAX_INT_SIZE < 8192) {
+        val = internal::get_table_negative<8192>(pos_exp, block_index + 1);
+      } else if (MAX_INT_SIZE < 16384) {
+        val = internal::get_table_negative<16384>(pos_exp, block_index + 1);
+      } else {
+        val = internal::get_table_negative<16384 + 8192>(pos_exp,
+                                                         block_index + 1);
+      }
+#else
+      // ----------------------------- TABLE MODE ------------------------------
+      // if the requested block is zero
+      const int32_t SHIFT_CONST = TABLE_SHIFT_CONST;
+      if (block_index < MIN_BLOCK_2[idx]) {
+        return 0;
+      }
+      const uint32_t p = POW10_OFFSET_2[idx] + block_index - MIN_BLOCK_2[idx];
+      // If every digit after the requested block is zero.
+      if (p >= POW10_OFFSET_2[idx + 1]) {
+        return 0;
+      }
+
+      val = POW10_SPLIT_2[p];
+#endif
+      const int32_t shift_amount =
+          SHIFT_CONST + (-exponent - static_cast<int32_t>(pos_exp));
+      BlockInt digits =
+          internal::mul_shift_mod_1e9(mantissa, val, shift_amount);
+      return digits;
+    } else {
+      return 0;
+    }
+  }
+
+  LIBC_INLINE constexpr BlockInt get_block(int block_index) {
+    if (block_index >= 0) {
+      return get_positive_block(block_index);
+    } else {
+      return get_negative_block(-1 - block_index);
+    }
+  }
+
+  LIBC_INLINE constexpr size_t get_positive_blocks() {
+    if (exponent < -FRACTION_LEN)
+      return 0;
+    const uint32_t idx =
+        exponent < 0
+            ? 0
+            : static_cast<uint32_t>(exponent + (IDX_SIZE - 1)) / IDX_SIZE;
+    return internal::length_for_num(idx * IDX_SIZE, FRACTION_LEN);
+  }
+
+  // This takes the index of a block after the decimal point (a negative block)
+  // and return if it's sure that all of the digits after it are zero.
+  LIBC_INLINE constexpr bool is_lowest_block(size_t negative_block_index) {
+#ifdef LIBC_COPT_FLOAT_TO_STR_NO_TABLE
+    // The decimal representation of 2**(-i) will have exactly i digits after
+    // the decimal point.
+    int num_requested_digits =
+        static_cast<int>((negative_block_index + 1) * BLOCK_SIZE);
+
+    return num_requested_digits > -exponent;
+#else
+    const int32_t idx = -exponent / static_cast<int32_t>(IDX_SIZE);
+    const size_t p =
+        POW10_OFFSET_2[idx] + negative_block_index - MIN_BLOCK_2[idx];
+    // If the remaining digits are all 0, then this is the lowest block.
+    return p >= POW10_OFFSET_2[idx + 1];
+#endif
+  }
+
+  LIBC_INLINE constexpr size_t zero_blocks_after_point() {
+#ifdef LIBC_COPT_FLOAT_TO_STR_NO_TABLE
+    if (exponent < -FRACTION_LEN) {
+      const int pos_exp = -exponent - 1;
+      const uint32_t pos_idx =
+          static_cast<uint32_t>(pos_exp + (IDX_SIZE - 1)) / IDX_SIZE;
+      const int32_t pos_len = ((internal::ceil_log10_pow2(pos_idx * IDX_SIZE) -
+                                internal::ceil_log10_pow2(FRACTION_LEN + 1)) /
+                               BLOCK_SIZE) -
+                              1;
+      return static_cast<uint32_t>(pos_len > 0 ? pos_len : 0);
+    }
+    return 0;
+#else
+    return MIN_BLOCK_2[-exponent / static_cast<int32_t>(IDX_SIZE)];
+#endif
+  }
+};
+
+#if !defined(LIBC_TYPES_LONG_DOUBLE_IS_FLOAT64) &&                             \
+    !defined(LIBC_COPT_FLOAT_TO_STR_NO_SPECIALIZE_LD)
+// --------------------------- LONG DOUBLE FUNCTIONS ---------------------------
+
+// this algorithm will work exactly the same for 80 bit and 128 bit long
+// doubles. They have the same max exponent, but even if they didn't the
+// constants should be calculated to be correct for any provided floating point
+// type.
+
+template <> class FloatToString<long double> {
+  fputil::FPBits<long double> float_bits;
+  bool is_negative = 0;
+  int exponent = 0;
+  FPBits::StorageType mantissa = 0;
+
+  static constexpr int FRACTION_LEN = fputil::FPBits<long double>::FRACTION_LEN;
+  static constexpr int EXP_BIAS = fputil::FPBits<long double>::EXP_BIAS;
+  static constexpr size_t UINT_WORD_SIZE = 64;
+
+  static constexpr size_t FLOAT_AS_INT_WIDTH =
+      internal::div_ceil(fputil::FPBits<long double>::MAX_BIASED_EXPONENT -
+                             FPBits::EXP_BIAS,
+                         UINT_WORD_SIZE) *
+      UINT_WORD_SIZE;
+  static constexpr size_t EXTRA_INT_WIDTH =
+      internal::div_ceil(sizeof(long double) * CHAR_BIT, UINT_WORD_SIZE) *
+      UINT_WORD_SIZE;
+
+  using wide_int = UInt<FLOAT_AS_INT_WIDTH + EXTRA_INT_WIDTH>;
+
+  // float_as_fixed represents the floating point number as a fixed point number
+  // with the point EXTRA_INT_WIDTH bits from the left of the number. This can
+  // store any number with a negative exponent.
+  wide_int float_as_fixed = 0;
+  int int_block_index = 0;
+
+  static constexpr size_t BLOCK_BUFFER_LEN =
+      internal::div_ceil(internal::log10_pow2(FLOAT_AS_INT_WIDTH), BLOCK_SIZE) +
+      1;
+  BlockInt block_buffer[BLOCK_BUFFER_LEN] = {0};
+  size_t block_buffer_valid = 0;
+
+  template <size_t Bits>
+  LIBC_INLINE static constexpr BlockInt grab_digits(UInt<Bits> &int_num) {
+    auto wide_result = int_num.div_uint_half_times_pow_2(EXP5_9, 9);
+    // the optional only comes into effect when dividing by 0, which will
+    // never happen here. Thus, we just assert that it has value.
+    LIBC_ASSERT(wide_result.has_value());
+    return static_cast<BlockInt>(wide_result.value());
+  }
+
+  LIBC_INLINE static constexpr void zero_leading_digits(wide_int &int_num) {
+    // WORD_SIZE is the width of the numbers used to internally represent the
+    // UInt
+    for (size_t i = 0; i < EXTRA_INT_WIDTH / wide_int::WORD_SIZE; ++i)
+      int_num[i + (FLOAT_AS_INT_WIDTH / wide_int::WORD_SIZE)] = 0;
+  }
+
+  // init_convert initializes float_as_int, cur_block, and block_buffer based on
+  // the mantissa and exponent of the initial number. Calling it will always
+  // return the class to the starting state.
+  LIBC_INLINE constexpr void init_convert() {
+    // No calculation necessary for the 0 case.
+    if (mantissa == 0 && exponent == 0)
+      return;
+
+    if (exponent > 0) {
+      // if the exponent is positive, then the number is fully above the decimal
+      // point. In this case we represent the float as an integer, then divide
+      // by 10^BLOCK_SIZE and take the remainder as our next block. This
+      // generates the digits from right to left, but the digits will be written
+      // from left to right, so it caches the results so they can be read in
+      // reverse order.
+
+      wide_int float_as_int = mantissa;
+
+      float_as_int <<= exponent;
+      int_block_index = 0;
+
+      while (float_as_int > 0) {
+        LIBC_ASSERT(int_block_index < static_cast<int>(BLOCK_BUFFER_LEN));
+        block_buffer[int_block_index] =
+            grab_digits<FLOAT_AS_INT_WIDTH + EXTRA_INT_WIDTH>(float_as_int);
+        ++int_block_index;
+      }
+      block_buffer_valid = int_block_index;
+
+    } else {
+      // if the exponent is not positive, then the number is at least partially
+      // below the decimal point. In this case we represent the float as a fixed
+      // point number with the decimal point after the top EXTRA_INT_WIDTH bits.
+      float_as_fixed = mantissa;
+
+      const int SHIFT_AMOUNT = FLOAT_AS_INT_WIDTH + exponent;
+      static_assert(EXTRA_INT_WIDTH >= sizeof(long double) * 8);
+      float_as_fixed <<= SHIFT_AMOUNT;
+
+      // If there are still digits above the decimal point, handle those.
+      if (cpp::countl_zero(float_as_fixed) <
+          static_cast<int>(EXTRA_INT_WIDTH)) {
+        UInt<EXTRA_INT_WIDTH> above_decimal_point =
+            float_as_fixed >> FLOAT_AS_INT_WIDTH;
+
+        size_t positive_int_block_index = 0;
+        while (above_decimal_point > 0) {
+          block_buffer[positive_int_block_index] =
+              grab_digits<EXTRA_INT_WIDTH>(above_decimal_point);
+          ++positive_int_block_index;
+        }
+        block_buffer_valid = positive_int_block_index;
+
+        // Zero all digits above the decimal point.
+        zero_leading_digits(float_as_fixed);
+        int_block_index = 0;
+      }
+    }
+  }
+
+public:
+  LIBC_INLINE constexpr FloatToString(long double init_float)
+      : float_bits(init_float) {
+    is_negative = float_bits.is_neg();
+    exponent = float_bits.get_explicit_exponent();
+    mantissa = float_bits.get_explicit_mantissa();
+
+    // Adjust for the width of the mantissa.
+    exponent -= FRACTION_LEN;
+
+    this->init_convert();
+  }
+
+  LIBC_INLINE constexpr size_t get_positive_blocks() {
+    if (exponent < -FRACTION_LEN)
+      return 0;
+
+    const uint32_t idx =
+        exponent < 0
+            ? 0
+            : static_cast<uint32_t>(exponent + (IDX_SIZE - 1)) / IDX_SIZE;
+    return internal::length_for_num(idx * IDX_SIZE, FRACTION_LEN);
+  }
+
+  LIBC_INLINE constexpr size_t zero_blocks_after_point() {
+#ifdef LIBC_COPT_FLOAT_TO_STR_USE_MEGA_LONG_DOUBLE_TABLE
+    return MIN_BLOCK_2[-exponent / IDX_SIZE];
+#else
+    if (exponent >= -FRACTION_LEN)
+      return 0;
+
+    const int pos_exp = -exponent - 1;
+    const uint32_t pos_idx =
+        static_cast<uint32_t>(pos_exp + (IDX_SIZE - 1)) / IDX_SIZE;
+    const int32_t pos_len = ((internal::ceil_log10_pow2(pos_idx * IDX_SIZE) -
+                              internal::ceil_log10_pow2(FRACTION_LEN + 1)) /
+                             BLOCK_SIZE) -
+                            1;
+    return static_cast<uint32_t>(pos_len > 0 ? pos_len : 0);
+#endif
+  }
+
+  LIBC_INLINE constexpr bool is_lowest_block(size_t negative_block_index) {
+    // The decimal representation of 2**(-i) will have exactly i digits after
+    // the decimal point.
+    const int num_requested_digits =
+        static_cast<int>((negative_block_index + 1) * BLOCK_SIZE);
+
+    return num_requested_digits > -exponent;
+  }
+
+  LIBC_INLINE constexpr BlockInt get_positive_block(int block_index) {
+    if (exponent < -FRACTION_LEN)
+      return 0;
+    if (block_index > static_cast<int>(block_buffer_valid) || block_index < 0)
+      return 0;
+
+    LIBC_ASSERT(block_index < static_cast<int>(BLOCK_BUFFER_LEN));
+
+    return block_buffer[block_index];
+  }
+
+  LIBC_INLINE constexpr BlockInt get_negative_block(int negative_block_index) {
+    if (exponent >= 0)
+      return 0;
+
+    // negative_block_index starts at 0 with the first block after the decimal
+    // point, and 1 with the second and so on. This converts to the same
+    // block_index used everywhere else.
+
+    const int block_index = -1 - negative_block_index;
+
+    // If we're currently after the requested block (remember these are
+    // negative indices) we reset the number to the start. This is only
+    // likely to happen in %g calls. This will also reset int_block_index.
+    // if (block_index > int_block_index) {
+    //   init_convert();
+    // }
+
+    // Printf is the only existing user of this code and it will only ever move
+    // downwards, except for %g but that currently creates a second
+    // float_to_string object so this assertion still holds. If a new user needs
+    // the ability to step backwards, uncomment the code above.
+    LIBC_ASSERT(block_index <= int_block_index);
+
+    // If we are currently before the requested block. Step until we reach the
+    // requested block. This is likely to only be one step.
+    while (block_index < int_block_index) {
+      zero_leading_digits(float_as_fixed);
+      float_as_fixed.mul(EXP10_9);
+      --int_block_index;
+    }
+
+    // We're now on the requested block, return the current block.
+    return static_cast<BlockInt>(float_as_fixed >> FLOAT_AS_INT_WIDTH);
+  }
+
+  LIBC_INLINE constexpr BlockInt get_block(int block_index) {
+    if (block_index >= 0)
+      return get_positive_block(block_index);
+
+    return get_negative_block(-1 - block_index);
+  }
+};
+
+#endif // !LIBC_TYPES_LONG_DOUBLE_IS_FLOAT64 &&
+       // !LIBC_COPT_FLOAT_TO_STR_NO_SPECIALIZE_LD
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FLOAT_TO_STRING_H
diff --git a/contrib/llvm-project/libc/src/__support/freelist.cpp b/contrib/llvm-project/libc/src/__support/freelist.cpp
new file mode 100644
index 000000000000..bfb90ae1c4db
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/freelist.cpp
@@ -0,0 +1,42 @@
+//===-- Implementation for freelist ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "freelist.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+void FreeList::push(Node *node) {
+  if (begin_) {
+    LIBC_ASSERT(Block::from_usable_space(node)->outer_size() ==
+                    begin_->block()->outer_size() &&
+                "freelist entries must have the same size");
+    // Since the list is circular, insert the node immediately before begin_.
+    node->prev = begin_->prev;
+    node->next = begin_;
+    begin_->prev->next = node;
+    begin_->prev = node;
+  } else {
+    begin_ = node->prev = node->next = node;
+  }
+}
+
+void FreeList::remove(Node *node) {
+  LIBC_ASSERT(begin_ && "cannot remove from empty list");
+  if (node == node->next) {
+    LIBC_ASSERT(node == begin_ &&
+                "a self-referential node must be the only element");
+    begin_ = nullptr;
+  } else {
+    node->prev->next = node->next;
+    node->next->prev = node->prev;
+    if (begin_ == node)
+      begin_ = node->next;
+  }
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/freelist.h b/contrib/llvm-project/libc/src/__support/freelist.h
new file mode 100644
index 000000000000..c51f14fe57ae
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/freelist.h
@@ -0,0 +1,89 @@
+//===-- Interface for freelist --------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FREELIST_H
+#define LLVM_LIBC_SRC___SUPPORT_FREELIST_H
+
+#include "block.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+/// A circularly-linked FIFO list storing free Blocks. All Blocks on a list
+/// are the same size. The blocks are referenced by Nodes in the list; the list
+/// refers to these, but it does not own them.
+///
+/// Allocating free blocks in FIFO order maximizes the amount of time before a
+/// free block is reused. This in turn maximizes the number of opportunities for
+/// it to be coalesced with an adjacent block, which tends to reduce heap
+/// fragmentation.
+class FreeList {
+public:
+  class Node {
+  public:
+    /// @returns The block containing this node.
+    LIBC_INLINE const Block *block() const {
+      return Block::from_usable_space(this);
+    }
+
+    /// @returns The block containing this node.
+    LIBC_INLINE Block *block() { return Block::from_usable_space(this); }
+
+    /// @returns The inner size of blocks in the list containing this node.
+    LIBC_INLINE size_t size() const { return block()->inner_size(); }
+
+  private:
+    // Circularly linked pointers to adjacent nodes.
+    Node *prev;
+    Node *next;
+    friend class FreeList;
+  };
+
+  LIBC_INLINE constexpr FreeList() : FreeList(nullptr) {}
+  LIBC_INLINE constexpr FreeList(Node *begin) : begin_(begin) {}
+
+  LIBC_INLINE bool empty() const { return !begin_; }
+
+  /// @returns The inner size of blocks in the list.
+  LIBC_INLINE size_t size() const {
+    LIBC_ASSERT(begin_ && "empty lists have no size");
+    return begin_->size();
+  }
+
+  /// @returns The first node in the list.
+  LIBC_INLINE Node *begin() { return begin_; }
+
+  /// @returns The first block in the list.
+  LIBC_INLINE Block *front() { return begin_->block(); }
+
+  /// Push a block to the back of the list.
+  /// The block must be large enough to contain a node.
+  LIBC_INLINE void push(Block *block) {
+    LIBC_ASSERT(!block->used() &&
+                "only free blocks can be placed on free lists");
+    LIBC_ASSERT(block->inner_size_free() >= sizeof(FreeList) &&
+                "block too small to accomodate free list node");
+    push(new (block->usable_space()) Node);
+  }
+
+  /// Push an already-constructed node to the back of the list.
+  /// This allows pushing derived node types with additional data.
+  void push(Node *node);
+
+  /// Pop the first node from the list.
+  LIBC_INLINE void pop() { remove(begin_); }
+
+  /// Remove an arbitrary node from the list.
+  void remove(Node *node);
+
+private:
+  Node *begin_;
+};
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FREELIST_H
diff --git a/contrib/llvm-project/libc/src/__support/freelist_heap.cpp b/contrib/llvm-project/libc/src/__support/freelist_heap.cpp
new file mode 100644
index 000000000000..4deb0e0f09e2
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/freelist_heap.cpp
@@ -0,0 +1,19 @@
+//===-- Implementation for freelist_heap ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/__support/freelist_heap.h"
+#include "src/__support/macros/config.h"
+
+#include <stddef.h>
+
+namespace LIBC_NAMESPACE_DECL {
+
+static LIBC_CONSTINIT FreeListHeap freelist_heap_symbols;
+FreeListHeap *freelist_heap = &freelist_heap_symbols;
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/freelist_heap.h b/contrib/llvm-project/libc/src/__support/freelist_heap.h
new file mode 100644
index 000000000000..d58685194aeb
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/freelist_heap.h
@@ -0,0 +1,209 @@
+//===-- Interface for freelist_heap ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FREELIST_HEAP_H
+#define LLVM_LIBC_SRC___SUPPORT_FREELIST_HEAP_H
+
+#include <stddef.h>
+
+#include "block.h"
+#include "freestore.h"
+#include "src/__support/CPP/optional.h"
+#include "src/__support/CPP/span.h"
+#include "src/__support/libc_assert.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/math_extras.h"
+#include "src/string/memory_utils/inline_memcpy.h"
+#include "src/string/memory_utils/inline_memset.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+extern "C" cpp::byte _end;
+extern "C" cpp::byte __llvm_libc_heap_limit;
+
+using cpp::optional;
+using cpp::span;
+
+LIBC_INLINE constexpr bool IsPow2(size_t x) { return x && (x & (x - 1)) == 0; }
+
+class FreeListHeap {
+public:
+  constexpr FreeListHeap() : begin(&_end), end(&__llvm_libc_heap_limit) {}
+
+  constexpr FreeListHeap(span<cpp::byte> region)
+      : begin(region.begin()), end(region.end()) {}
+
+  void *allocate(size_t size);
+  void *aligned_allocate(size_t alignment, size_t size);
+  // NOTE: All pointers passed to free must come from one of the other
+  // allocation functions: `allocate`, `aligned_allocate`, `realloc`, `calloc`.
+  void free(void *ptr);
+  void *realloc(void *ptr, size_t size);
+  void *calloc(size_t num, size_t size);
+
+  cpp::span<cpp::byte> region() const { return {begin, end}; }
+
+private:
+  void init();
+
+  void *allocate_impl(size_t alignment, size_t size);
+
+  span<cpp::byte> block_to_span(Block *block) {
+    return span<cpp::byte>(block->usable_space(), block->inner_size());
+  }
+
+  bool is_valid_ptr(void *ptr) { return ptr >= begin && ptr < end; }
+
+  cpp::byte *begin;
+  cpp::byte *end;
+  bool is_initialized = false;
+  FreeStore free_store;
+};
+
+template <size_t BUFF_SIZE> class FreeListHeapBuffer : public FreeListHeap {
+public:
+  constexpr FreeListHeapBuffer() : FreeListHeap{buffer}, buffer{} {}
+
+private:
+  cpp::byte buffer[BUFF_SIZE];
+};
+
+LIBC_INLINE void FreeListHeap::init() {
+  LIBC_ASSERT(!is_initialized && "duplicate initialization");
+  auto result = Block::init(region());
+  Block *block = *result;
+  free_store.set_range({0, cpp::bit_ceil(block->inner_size())});
+  free_store.insert(block);
+  is_initialized = true;
+}
+
+LIBC_INLINE void *FreeListHeap::allocate_impl(size_t alignment, size_t size) {
+  if (size == 0)
+    return nullptr;
+
+  if (!is_initialized)
+    init();
+
+  size_t request_size = Block::min_size_for_allocation(alignment, size);
+  if (!request_size)
+    return nullptr;
+
+  Block *block = free_store.remove_best_fit(request_size);
+  if (!block)
+    return nullptr;
+
+  auto block_info = Block::allocate(block, alignment, size);
+  if (block_info.next)
+    free_store.insert(block_info.next);
+  if (block_info.prev)
+    free_store.insert(block_info.prev);
+
+  block_info.block->mark_used();
+  return block_info.block->usable_space();
+}
+
+LIBC_INLINE void *FreeListHeap::allocate(size_t size) {
+  return allocate_impl(alignof(max_align_t), size);
+}
+
+LIBC_INLINE void *FreeListHeap::aligned_allocate(size_t alignment,
+                                                 size_t size) {
+  // The alignment must be an integral power of two.
+  if (!IsPow2(alignment))
+    return nullptr;
+
+  // The size parameter must be an integral multiple of alignment.
+  if (size % alignment != 0)
+    return nullptr;
+
+  // The minimum alignment supported by Block is max_align_t.
+  alignment = cpp::max(alignment, alignof(max_align_t));
+
+  return allocate_impl(alignment, size);
+}
+
+LIBC_INLINE void FreeListHeap::free(void *ptr) {
+  cpp::byte *bytes = static_cast<cpp::byte *>(ptr);
+
+  LIBC_ASSERT(is_valid_ptr(bytes) && "Invalid pointer");
+
+  Block *block = Block::from_usable_space(bytes);
+  LIBC_ASSERT(block->next() && "sentinel last block cannot be freed");
+  LIBC_ASSERT(block->used() && "double free");
+  block->mark_free();
+
+  // Can we combine with the left or right blocks?
+  Block *prev_free = block->prev_free();
+  Block *next = block->next();
+
+  if (prev_free != nullptr) {
+    // Remove from free store and merge.
+    free_store.remove(prev_free);
+    block = prev_free;
+    block->merge_next();
+  }
+  if (!next->used()) {
+    free_store.remove(next);
+    block->merge_next();
+  }
+  // Add back to the freelist
+  free_store.insert(block);
+}
+
+// Follows constract of the C standard realloc() function
+// If ptr is free'd, will return nullptr.
+LIBC_INLINE void *FreeListHeap::realloc(void *ptr, size_t size) {
+  if (size == 0) {
+    free(ptr);
+    return nullptr;
+  }
+
+  // If the pointer is nullptr, allocate a new memory.
+  if (ptr == nullptr)
+    return allocate(size);
+
+  cpp::byte *bytes = static_cast<cpp::byte *>(ptr);
+
+  if (!is_valid_ptr(bytes))
+    return nullptr;
+
+  Block *block = Block::from_usable_space(bytes);
+  if (!block->used())
+    return nullptr;
+  size_t old_size = block->inner_size();
+
+  // Do nothing and return ptr if the required memory size is smaller than
+  // the current size.
+  if (old_size >= size)
+    return ptr;
+
+  void *new_ptr = allocate(size);
+  // Don't invalidate ptr if allocate(size) fails to initilize the memory.
+  if (new_ptr == nullptr)
+    return nullptr;
+  LIBC_NAMESPACE::inline_memcpy(new_ptr, ptr, old_size);
+
+  free(ptr);
+  return new_ptr;
+}
+
+LIBC_INLINE void *FreeListHeap::calloc(size_t num, size_t size) {
+  size_t bytes;
+  if (__builtin_mul_overflow(num, size, &bytes))
+    return nullptr;
+  void *ptr = allocate(bytes);
+  if (ptr != nullptr)
+    LIBC_NAMESPACE::inline_memset(ptr, 0, bytes);
+  return ptr;
+}
+
+extern FreeListHeap *freelist_heap;
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FREELIST_HEAP_H
diff --git a/contrib/llvm-project/libc/src/__support/freestore.h b/contrib/llvm-project/libc/src/__support/freestore.h
new file mode 100644
index 000000000000..09f2479debb3
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/freestore.h
@@ -0,0 +1,114 @@
+//===-- Interface for freestore ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FREESTORE_H
+#define LLVM_LIBC_SRC___SUPPORT_FREESTORE_H
+
+#include "freetrie.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+/// A best-fit store of variously-sized free blocks. Blocks can be inserted and
+/// removed in logarithmic time.
+class FreeStore {
+public:
+  FreeStore() = default;
+  FreeStore(const FreeStore &other) = delete;
+  FreeStore &operator=(const FreeStore &other) = delete;
+
+  /// Sets the range of possible block sizes. This can only be called when the
+  /// trie is empty.
+  LIBC_INLINE void set_range(FreeTrie::SizeRange range) {
+    large_trie.set_range(range);
+  }
+
+  /// Insert a free block. If the block is too small to be tracked, nothing
+  /// happens.
+  void insert(Block *block);
+
+  /// Remove a free block. If the block is too small to be tracked, nothing
+  /// happens.
+  void remove(Block *block);
+
+  /// Remove a best-fit free block that can contain the given size when
+  /// allocated. Returns nullptr if there is no such block.
+  Block *remove_best_fit(size_t size);
+
+private:
+  static constexpr size_t MIN_OUTER_SIZE =
+      align_up(sizeof(Block) + sizeof(FreeList::Node), alignof(max_align_t));
+  static constexpr size_t MIN_LARGE_OUTER_SIZE =
+      align_up(sizeof(Block) + sizeof(FreeTrie::Node), alignof(max_align_t));
+  static constexpr size_t NUM_SMALL_SIZES =
+      (MIN_LARGE_OUTER_SIZE - MIN_OUTER_SIZE) / alignof(max_align_t);
+
+  LIBC_INLINE static bool too_small(Block *block) {
+    return block->outer_size() < MIN_OUTER_SIZE;
+  }
+  LIBC_INLINE static bool is_small(Block *block) {
+    return block->outer_size() < MIN_LARGE_OUTER_SIZE;
+  }
+
+  FreeList &small_list(Block *block);
+  FreeList *find_best_small_fit(size_t size);
+
+  cpp::array<FreeList, NUM_SMALL_SIZES> small_lists;
+  FreeTrie large_trie;
+};
+
+LIBC_INLINE void FreeStore::insert(Block *block) {
+  if (too_small(block))
+    return;
+  if (is_small(block))
+    small_list(block).push(block);
+  else
+    large_trie.push(block);
+}
+
+LIBC_INLINE void FreeStore::remove(Block *block) {
+  if (too_small(block))
+    return;
+  if (is_small(block)) {
+    small_list(block).remove(
+        reinterpret_cast<FreeList::Node *>(block->usable_space()));
+  } else {
+    large_trie.remove(
+        reinterpret_cast<FreeTrie::Node *>(block->usable_space()));
+  }
+}
+
+LIBC_INLINE Block *FreeStore::remove_best_fit(size_t size) {
+  if (FreeList *list = find_best_small_fit(size)) {
+    Block *block = list->front();
+    list->pop();
+    return block;
+  }
+  if (FreeTrie::Node *best_fit = large_trie.find_best_fit(size)) {
+    Block *block = best_fit->block();
+    large_trie.remove(best_fit);
+    return block;
+  }
+  return nullptr;
+}
+
+LIBC_INLINE FreeList &FreeStore::small_list(Block *block) {
+  LIBC_ASSERT(is_small(block) && "only legal for small blocks");
+  return small_lists[(block->outer_size() - MIN_OUTER_SIZE) /
+                     alignof(max_align_t)];
+}
+
+LIBC_INLINE FreeList *FreeStore::find_best_small_fit(size_t size) {
+  for (FreeList &list : small_lists)
+    if (!list.empty() && list.size() >= size)
+      return &list;
+  return nullptr;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FREESTORE_H
diff --git a/contrib/llvm-project/libc/src/__support/freetrie.cpp b/contrib/llvm-project/libc/src/__support/freetrie.cpp
new file mode 100644
index 000000000000..e76efe717f21
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/freetrie.cpp
@@ -0,0 +1,64 @@
+//===-- Implementation for freetrie ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "freetrie.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+void FreeTrie::remove(Node *node) {
+  LIBC_ASSERT(!empty() && "cannot remove from empty trie");
+  FreeList list = node;
+  list.pop();
+  Node *new_node = static_cast<Node *>(list.begin());
+  if (!new_node) {
+    // The freelist is empty. Replace the subtrie root with an arbitrary leaf.
+    // This is legal because there is no relationship between the size of the
+    // root and its children.
+    Node *leaf = node;
+    while (leaf->lower || leaf->upper)
+      leaf = leaf->lower ? leaf->lower : leaf->upper;
+    if (leaf == node) {
+      // If the root is a leaf, then removing it empties the subtrie.
+      replace_node(node, nullptr);
+      return;
+    }
+
+    replace_node(leaf, nullptr);
+    new_node = leaf;
+  }
+
+  if (!is_head(node))
+    return;
+
+  // Copy the trie links to the new head.
+  new_node->lower = node->lower;
+  new_node->upper = node->upper;
+  new_node->parent = node->parent;
+  replace_node(node, new_node);
+}
+
+void FreeTrie::replace_node(Node *node, Node *new_node) {
+  LIBC_ASSERT(is_head(node) && "only head nodes contain trie links");
+
+  if (node->parent) {
+    Node *&parent_child =
+        node->parent->lower == node ? node->parent->lower : node->parent->upper;
+    LIBC_ASSERT(parent_child == node &&
+                "no reference to child node found in parent");
+    parent_child = new_node;
+  } else {
+    LIBC_ASSERT(root == node && "non-root node had no parent");
+    root = new_node;
+  }
+  if (node->lower)
+    node->lower->parent = new_node;
+  if (node->upper)
+    node->upper->parent = new_node;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/contrib/llvm-project/libc/src/__support/freetrie.h b/contrib/llvm-project/libc/src/__support/freetrie.h
new file mode 100644
index 000000000000..42363c2c9e2f
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/freetrie.h
@@ -0,0 +1,237 @@
+//===-- Interface for freetrie --------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_FREETRIE_H
+#define LLVM_LIBC_SRC___SUPPORT_FREETRIE_H
+
+#include "freelist.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+/// A trie of free lists.
+///
+/// This is an unusual little data structure originally from Doug Lea's malloc.
+/// Finding the best fit from a set of differently-sized free list typically
+/// required some kind of ordered map, and these are typically implemented using
+/// a self-balancing binary search tree. Those are notorious for having a
+/// relatively large number of special cases, while this trie has relatively
+/// few, which helps with code size.
+///
+/// Operations on the trie are logarithmic not on the number of nodes within it,
+/// but rather the fixed range of possible sizes that the trie can contain. This
+/// means that the data structure would likely actually perform worse than an
+/// e.g. red-black tree, but its implementation is still much simpler.
+///
+/// Each trie node's children subdivide the range of possible sizes into two
+/// halves: a lower and an upper. The node itself holds a free list of some size
+/// within its range. This makes it possible to summarily replace any node with
+/// any leaf within its subtrie, which makes it very straightforward to remove a
+/// node. Insertion is also simple; the only real complexity lies with finding
+/// the best fit. This can still be done in logarithmic time with only a few
+/// cases to consider.
+///
+/// The trie refers to, but does not own, the Nodes that comprise it.
+class FreeTrie {
+public:
+  /// A trie node that is also a free list. Only the head node of each list is
+  /// actually part of the trie. The subtrie contains a continous SizeRange of
+  /// free lists. The lower and upper subtrie's contain the lower and upper half
+  /// of the subtries range. There is no direct relationship between the size of
+  /// this node's free list and the contents of the lower and upper subtries.
+  class Node : public FreeList::Node {
+    /// The child subtrie covering the lower half of this subtrie's size range.
+    /// Undefined if this is not the head of the list.
+    Node *lower;
+    /// The child subtrie covering the upper half of this subtrie's size range.
+    /// Undefined if this is not the head of the list.
+    Node *upper;
+    /// The parent subtrie. nullptr if this is the root or not the head of the
+    /// list.
+    Node *parent;
+
+    friend class FreeTrie;
+  };
+
+  /// Power-of-two range of sizes covered by a subtrie.
+  struct SizeRange {
+    size_t min;
+    size_t width;
+
+    LIBC_INLINE constexpr SizeRange(size_t min, size_t width)
+        : min(min), width(width) {
+      LIBC_ASSERT(!(width & (width - 1)) && "width must be a power of two");
+    }
+
+    /// @returns The lower half of the size range.
+    LIBC_INLINE SizeRange lower() const { return {min, width / 2}; }
+
+    /// @returns The upper half of the size range.
+    LIBC_INLINE SizeRange upper() const { return {min + width / 2, width / 2}; }
+
+    /// @returns The largest size in this range.
+    LIBC_INLINE size_t max() const { return min + (width - 1); }
+
+    /// @returns Whether the range contains the given size.
+    LIBC_INLINE bool contains(size_t size) const {
+      return min <= size && size < min + width;
+    }
+  };
+
+  LIBC_INLINE constexpr FreeTrie() : FreeTrie(SizeRange{0, 0}) {}
+  LIBC_INLINE constexpr FreeTrie(SizeRange range) : range(range) {}
+
+  /// Sets the range of possible block sizes. This can only be called when the
+  /// trie is empty.
+  LIBC_INLINE void set_range(FreeTrie::SizeRange range) {
+    LIBC_ASSERT(empty() && "cannot change the range of a preexisting trie");
+    this->range = range;
+  }
+
+  /// @returns Whether the trie contains any blocks.
+  LIBC_INLINE bool empty() const { return !root; }
+
+  /// Push a block to the trie.
+  void push(Block *block);
+
+  /// Remove a node from this trie node's free list.
+  void remove(Node *node);
+
+  /// @returns A smallest node that can allocate the given size; otherwise
+  /// nullptr.
+  Node *find_best_fit(size_t size);
+
+private:
+  /// @returns Whether a node is the head of its containing freelist.
+  bool is_head(Node *node) const { return node->parent || node == root; }
+
+  /// Replaces references to one node with another (or nullptr) in all adjacent
+  /// parent and child nodes.
+  void replace_node(Node *node, Node *new_node);
+
+  Node *root = nullptr;
+  SizeRange range;
+};
+
+LIBC_INLINE void FreeTrie::push(Block *block) {
+  LIBC_ASSERT(block->inner_size_free() >= sizeof(Node) &&
+              "block too small to accomodate free trie node");
+  size_t size = block->inner_size();
+  LIBC_ASSERT(range.contains(size) && "requested size out of trie range");
+
+  // Find the position in the tree to push to.
+  Node **cur = &root;
+  Node *parent = nullptr;
+  SizeRange cur_range = range;
+  while (*cur && (*cur)->size() != size) {
+    LIBC_ASSERT(cur_range.contains(size) && "requested size out of trie range");
+    parent = *cur;
+    if (size <= cur_range.lower().max()) {
+      cur = &(*cur)->lower;
+      cur_range = cur_range.lower();
+    } else {
+      cur = &(*cur)->upper;
+      cur_range = cur_range.upper();
+    }
+  }
+
+  Node *node = new (block->usable_space()) Node;
+  FreeList list = *cur;
+  if (list.empty()) {
+    node->parent = parent;
+    node->lower = node->upper = nullptr;
+  } else {
+    node->parent = nullptr;
+  }
+  list.push(node);
+  *cur = static_cast<Node *>(list.begin());
+}
+
+LIBC_INLINE FreeTrie::Node *FreeTrie::find_best_fit(size_t size) {
+  if (empty() || range.max() < size)
+    return nullptr;
+
+  Node *cur = root;
+  SizeRange cur_range = range;
+  Node *best_fit = nullptr;
+  Node *deferred_upper_trie = nullptr;
+  FreeTrie::SizeRange deferred_upper_range{0, 0};
+
+  while (true) {
+    LIBC_ASSERT(cur_range.contains(cur->size()) &&
+                "trie node size out of range");
+    LIBC_ASSERT(cur_range.max() >= size &&
+                "range could not fit requested size");
+    LIBC_ASSERT((!best_fit || cur_range.min < best_fit->size()) &&
+                "range could not contain a best fit");
+
+    // If the current node is an exact fit, it is a best fit.
+    if (cur->size() == size)
+      return cur;
+
+    if (cur->size() > size && (!best_fit || cur->size() < best_fit->size())) {
+      // The current node is a better fit.
+      best_fit = cur;
+
+      // If there is a deferred upper subtrie, then the current node is
+      // somewhere in its lower sibling subtrie. That means that the new best
+      // fit is better than the best fit in the deferred subtrie.
+      LIBC_ASSERT(
+          (!deferred_upper_trie ||
+           deferred_upper_range.min > best_fit->size()) &&
+          "deferred upper subtrie should be outclassed by new best fit");
+      deferred_upper_trie = nullptr;
+    }
+
+    // Determine which subtries might contain the best fit.
+    bool lower_impossible = !cur->lower || cur_range.lower().max() < size;
+    bool upper_impossible =
+        !cur->upper ||
+        // If every node in the lower trie fits
+        (!lower_impossible && cur_range.min >= size) ||
+        // If every node in the upper trie is worse than the current best
+        (best_fit && cur_range.upper().min >= best_fit->size());
+
+    if (lower_impossible && upper_impossible) {
+      if (!deferred_upper_trie)
+        return best_fit;
+      // Scan the deferred upper subtrie and consider whether any element within
+      // provides a better fit.
+      //
+      // This can only ever be reached once. In a deferred upper subtrie, every
+      // node fits, so the higher of two subtries can never contain a best fit.
+      cur = deferred_upper_trie;
+      cur_range = deferred_upper_range;
+      deferred_upper_trie = nullptr;
+      continue;
+    }
+
+    if (lower_impossible) {
+      cur = cur->upper;
+      cur_range = cur_range.upper();
+    } else if (upper_impossible) {
+      cur = cur->lower;
+      cur_range = cur_range.lower();
+    } else {
+      // Both subtries might contain a better fit. Any fit in the lower subtrie
+      // is better than the any fit in the upper subtrie, so scan the lower
+      // and return to the upper only if no better fits were found. (Any better
+      // fit found clears the deferred upper subtrie.)
+      LIBC_ASSERT((!deferred_upper_trie ||
+                   cur_range.upper().max() < deferred_upper_range.min) &&
+                  "old deferred upper subtrie should be outclassed by new");
+      deferred_upper_trie = cur->upper;
+      deferred_upper_range = cur_range.upper();
+      cur = cur->lower;
+      cur_range = cur_range.lower();
+    }
+  }
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_FREETRIE_H
diff --git a/contrib/llvm-project/libc/src/__support/hash.h b/contrib/llvm-project/libc/src/__support/hash.h
new file mode 100644
index 000000000000..49138b1f43b9
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/hash.h
@@ -0,0 +1,164 @@
+//===-- Portable string hash function ---------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_HASH_H
+#define LLVM_LIBC_SRC___SUPPORT_HASH_H
+
+#include "src/__support/CPP/bit.h"           // rotl
+#include "src/__support/CPP/limits.h"        // numeric_limits
+#include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/macros/config.h"
+#include "src/__support/uint128.h" // UInt128
+#include <stdint.h>                // For uint64_t
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+// Folded multiplication.
+// This function multiplies two 64-bit integers and xor the high and
+// low 64-bit parts of the result.
+LIBC_INLINE uint64_t folded_multiply(uint64_t x, uint64_t y) {
+  UInt128 p = static_cast<UInt128>(x) * static_cast<UInt128>(y);
+  uint64_t low = static_cast<uint64_t>(p);
+  uint64_t high = static_cast<uint64_t>(p >> 64);
+  return low ^ high;
+}
+
+// Read as little endian.
+// Shift-and-or implementation does not give a satisfactory code on aarch64.
+// Therefore, we use a union to read the value.
+template <typename T> LIBC_INLINE T read_little_endian(const void *ptr) {
+  const uint8_t *bytes = static_cast<const uint8_t *>(ptr);
+  uint8_t buffer[sizeof(T)];
+#if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
+  // Compiler should able to optimize this as a load followed by a byte
+  // swap. On aarch64 (-mbig-endian), this compiles to the following for
+  // int:
+  //      ldr     w0, [x0]
+  //      rev     w0, w0
+  //      ret
+  for (size_t i = 0; i < sizeof(T); ++i) {
+    buffer[i] = bytes[sizeof(T) - i - 1];
+  }
+#else
+  for (size_t i = 0; i < sizeof(T); ++i) {
+    buffer[i] = bytes[i];
+  }
+#endif
+  return cpp::bit_cast<T>(buffer);
+}
+
+// Specialized read functions for small values. size must be <= 8.
+LIBC_INLINE void read_small_values(const void *ptr, size_t size, uint64_t &low,
+                                   uint64_t &high) {
+  const uint8_t *bytes = static_cast<const uint8_t *>(ptr);
+  if (size >= 2) {
+    if (size >= 4) {
+      low = static_cast<uint64_t>(read_little_endian<uint32_t>(&bytes[0]));
+      high =
+          static_cast<uint64_t>(read_little_endian<uint32_t>(&bytes[size - 4]));
+    } else {
+      low = static_cast<uint64_t>(read_little_endian<uint16_t>(&bytes[0]));
+      high = static_cast<uint64_t>(bytes[size - 1]);
+    }
+  } else {
+    if (size > 0) {
+      low = static_cast<uint64_t>(bytes[0]);
+      high = static_cast<uint64_t>(bytes[0]);
+    } else {
+      low = 0;
+      high = 0;
+    }
+  }
+}
+
+// This constant comes from Kunth's prng (it empirically works well).
+LIBC_INLINE_VAR constexpr uint64_t MULTIPLE = 6364136223846793005;
+// Rotation amount for mixing.
+LIBC_INLINE_VAR constexpr uint64_t ROTATE = 23;
+
+// Randomly generated values. For now, we use the same values as in aHash as
+// they are widely tested.
+// https://github.com/tkaitchuck/aHash/blob/9f6a2ad8b721fd28da8dc1d0b7996677b374357c/src/random_state.rs#L38
+LIBC_INLINE_VAR constexpr uint64_t RANDOMNESS[2][4] = {
+    {0x243f6a8885a308d3, 0x13198a2e03707344, 0xa4093822299f31d0,
+     0x082efa98ec4e6c89},
+    {0x452821e638d01377, 0xbe5466cf34e90c6c, 0xc0ac29b7c97c50dd,
+     0x3f84d5b5b5470917},
+};
+
+// This is a portable string hasher. It is not cryptographically secure.
+// The quality of the hash is good enough to pass all tests in SMHasher.
+// The implementation is derived from the generic routine of aHash.
+class HashState {
+  uint64_t buffer;
+  uint64_t pad;
+  uint64_t extra_keys[2];
+  LIBC_INLINE void update(uint64_t low, uint64_t high) {
+    uint64_t combined =
+        folded_multiply(low ^ extra_keys[0], high ^ extra_keys[1]);
+    buffer = (buffer + pad) ^ combined;
+    buffer = cpp::rotl(buffer, ROTATE);
+  }
+  LIBC_INLINE static uint64_t mix(uint64_t seed) {
+    HashState mixer{RANDOMNESS[0][0], RANDOMNESS[0][1], RANDOMNESS[0][2],
+                    RANDOMNESS[0][3]};
+    mixer.update(seed, 0);
+    return mixer.finish();
+  }
+
+public:
+  LIBC_INLINE constexpr HashState(uint64_t a, uint64_t b, uint64_t c,
+                                  uint64_t d)
+      : buffer(a), pad(b), extra_keys{c, d} {}
+  LIBC_INLINE HashState(uint64_t seed) {
+    // Mix one more round of the seed to make it stronger.
+    uint64_t mixed = mix(seed);
+    buffer = RANDOMNESS[1][0] ^ mixed;
+    pad = RANDOMNESS[1][1] ^ mixed;
+    extra_keys[0] = RANDOMNESS[1][2] ^ mixed;
+    extra_keys[1] = RANDOMNESS[1][3] ^ mixed;
+  }
+  LIBC_INLINE void update(const void *ptr, size_t size) {
+    uint8_t const *bytes = static_cast<const uint8_t *>(ptr);
+    buffer = (buffer + size) * MULTIPLE;
+    uint64_t low, high;
+    if (size > 8) {
+      if (size > 16) {
+        // update tail
+        low = read_little_endian<uint64_t>(&bytes[size - 16]);
+        high = read_little_endian<uint64_t>(&bytes[size - 8]);
+        update(low, high);
+        while (size > 16) {
+          low = read_little_endian<uint64_t>(&bytes[0]);
+          high = read_little_endian<uint64_t>(&bytes[8]);
+          update(low, high);
+          bytes += 16;
+          size -= 16;
+        }
+      } else {
+        low = read_little_endian<uint64_t>(&bytes[0]);
+        high = read_little_endian<uint64_t>(&bytes[size - 8]);
+        update(low, high);
+      }
+    } else {
+      read_small_values(ptr, size, low, high);
+      update(low, high);
+    }
+  }
+  LIBC_INLINE uint64_t finish() {
+    int rot = buffer & 63;
+    uint64_t folded = folded_multiply(buffer, pad);
+    return cpp::rotl(folded, rot);
+  }
+};
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_HASH_H
diff --git a/contrib/llvm-project/libc/src/__support/high_precision_decimal.h b/contrib/llvm-project/libc/src/__support/high_precision_decimal.h
new file mode 100644
index 000000000000..cb4b50c31544
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/high_precision_decimal.h
@@ -0,0 +1,442 @@
+//===-- High Precision Decimal ----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See httpss//llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// -----------------------------------------------------------------------------
+//                               **** WARNING ****
+// This file is shared with libc++. You should also be careful when adding
+// dependencies to this file, since it needs to build for all libc++ targets.
+// -----------------------------------------------------------------------------
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_HIGH_PRECISION_DECIMAL_H
+#define LLVM_LIBC_SRC___SUPPORT_HIGH_PRECISION_DECIMAL_H
+
+#include "src/__support/CPP/limits.h"
+#include "src/__support/ctype_utils.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/str_to_integer.h"
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+struct LShiftTableEntry {
+  uint32_t new_digits;
+  char const *power_of_five;
+};
+
+// -----------------------------------------------------------------------------
+//                               **** WARNING ****
+// This interface is shared with libc++, if you change this interface you need
+// to update it in both libc and libc++.
+// -----------------------------------------------------------------------------
+// This is used in both this file and in the main str_to_float.h.
+// TODO: Figure out where to put this.
+enum class RoundDirection { Up, Down, Nearest };
+
+// This is based on the HPD data structure described as part of the Simple
+// Decimal Conversion algorithm by Nigel Tao, described at this link:
+// https://nigeltao.github.io/blog/2020/parse-number-f64-simple.html
+class HighPrecisionDecimal {
+
+  // This precomputed table speeds up left shifts by having the number of new
+  // digits that will be added by multiplying 5^i by 2^i. If the number is less
+  // than 5^i then it will add one fewer digit. There are only 60 entries since
+  // that's the max shift amount.
+  // This table was generated by the script at
+  // libc/utils/mathtools/GenerateHPDConstants.py
+  static constexpr LShiftTableEntry LEFT_SHIFT_DIGIT_TABLE[] = {
+      {0, ""},
+      {1, "5"},
+      {1, "25"},
+      {1, "125"},
+      {2, "625"},
+      {2, "3125"},
+      {2, "15625"},
+      {3, "78125"},
+      {3, "390625"},
+      {3, "1953125"},
+      {4, "9765625"},
+      {4, "48828125"},
+      {4, "244140625"},
+      {4, "1220703125"},
+      {5, "6103515625"},
+      {5, "30517578125"},
+      {5, "152587890625"},
+      {6, "762939453125"},
+      {6, "3814697265625"},
+      {6, "19073486328125"},
+      {7, "95367431640625"},
+      {7, "476837158203125"},
+      {7, "2384185791015625"},
+      {7, "11920928955078125"},
+      {8, "59604644775390625"},
+      {8, "298023223876953125"},
+      {8, "1490116119384765625"},
+      {9, "7450580596923828125"},
+      {9, "37252902984619140625"},
+      {9, "186264514923095703125"},
+      {10, "931322574615478515625"},
+      {10, "4656612873077392578125"},
+      {10, "23283064365386962890625"},
+      {10, "116415321826934814453125"},
+      {11, "582076609134674072265625"},
+      {11, "2910383045673370361328125"},
+      {11, "14551915228366851806640625"},
+      {12, "72759576141834259033203125"},
+      {12, "363797880709171295166015625"},
+      {12, "1818989403545856475830078125"},
+      {13, "9094947017729282379150390625"},
+      {13, "45474735088646411895751953125"},
+      {13, "227373675443232059478759765625"},
+      {13, "1136868377216160297393798828125"},
+      {14, "5684341886080801486968994140625"},
+      {14, "28421709430404007434844970703125"},
+      {14, "142108547152020037174224853515625"},
+      {15, "710542735760100185871124267578125"},
+      {15, "3552713678800500929355621337890625"},
+      {15, "17763568394002504646778106689453125"},
+      {16, "88817841970012523233890533447265625"},
+      {16, "444089209850062616169452667236328125"},
+      {16, "2220446049250313080847263336181640625"},
+      {16, "11102230246251565404236316680908203125"},
+      {17, "55511151231257827021181583404541015625"},
+      {17, "277555756156289135105907917022705078125"},
+      {17, "1387778780781445675529539585113525390625"},
+      {18, "6938893903907228377647697925567626953125"},
+      {18, "34694469519536141888238489627838134765625"},
+      {18, "173472347597680709441192448139190673828125"},
+      {19, "867361737988403547205962240695953369140625"},
+  };
+
+  // The maximum amount we can shift is the number of bits used in the
+  // accumulator, minus the number of bits needed to represent the base (in this
+  // case 4).
+  static constexpr uint32_t MAX_SHIFT_AMOUNT = sizeof(uint64_t) - 4;
+
+  // 800 is an arbitrary number of digits, but should be
+  // large enough for any practical number.
+  static constexpr uint32_t MAX_NUM_DIGITS = 800;
+
+  uint32_t num_digits = 0;
+  int32_t decimal_point = 0;
+  bool truncated = false;
+  uint8_t digits[MAX_NUM_DIGITS];
+
+private:
+  LIBC_INLINE bool should_round_up(int32_t round_to_digit,
+                                   RoundDirection round) {
+    if (round_to_digit < 0 ||
+        static_cast<uint32_t>(round_to_digit) >= this->num_digits) {
+      return false;
+    }
+
+    // The above condition handles all cases where all of the trailing digits
+    // are zero. In that case, if the rounding mode is up, then this number
+    // should be rounded up. Similarly, if the rounding mode is down, then it
+    // should always round down.
+    if (round == RoundDirection::Up) {
+      return true;
+    } else if (round == RoundDirection::Down) {
+      return false;
+    }
+    // Else round to nearest.
+
+    // If we're right in the middle and there are no extra digits
+    if (this->digits[round_to_digit] == 5 &&
+        static_cast<uint32_t>(round_to_digit + 1) == this->num_digits) {
+
+      // Round up if we've truncated (since that means the result is slightly
+      // higher than what's represented.)
+      if (this->truncated) {
+        return true;
+      }
+
+      // If this exactly halfway, round to even.
+      if (round_to_digit == 0)
+        // When the input is ".5".
+        return false;
+      return this->digits[round_to_digit - 1] % 2 != 0;
+    }
+    // If there are digits after round_to_digit, they must be non-zero since we
+    // trim trailing zeroes after all operations that change digits.
+    return this->digits[round_to_digit] >= 5;
+  }
+
+  // Takes an amount to left shift and returns the number of new digits needed
+  // to store the result based on LEFT_SHIFT_DIGIT_TABLE.
+  LIBC_INLINE uint32_t get_num_new_digits(uint32_t lshift_amount) {
+    const char *power_of_five =
+        LEFT_SHIFT_DIGIT_TABLE[lshift_amount].power_of_five;
+    uint32_t new_digits = LEFT_SHIFT_DIGIT_TABLE[lshift_amount].new_digits;
+    uint32_t digit_index = 0;
+    while (power_of_five[digit_index] != 0) {
+      if (digit_index >= this->num_digits) {
+        return new_digits - 1;
+      }
+      if (this->digits[digit_index] !=
+          internal::b36_char_to_int(power_of_five[digit_index])) {
+        return new_digits -
+               ((this->digits[digit_index] <
+                 internal::b36_char_to_int(power_of_five[digit_index]))
+                    ? 1
+                    : 0);
+      }
+      ++digit_index;
+    }
+    return new_digits;
+  }
+
+  // Trim all trailing 0s
+  LIBC_INLINE void trim_trailing_zeroes() {
+    while (this->num_digits > 0 && this->digits[this->num_digits - 1] == 0) {
+      --this->num_digits;
+    }
+    if (this->num_digits == 0) {
+      this->decimal_point = 0;
+    }
+  }
+
+  // Perform a digitwise binary non-rounding right shift on this value by
+  // shift_amount. The shift_amount can't be more than MAX_SHIFT_AMOUNT to
+  // prevent overflow.
+  LIBC_INLINE void right_shift(uint32_t shift_amount) {
+    uint32_t read_index = 0;
+    uint32_t write_index = 0;
+
+    uint64_t accumulator = 0;
+
+    const uint64_t shift_mask = (uint64_t(1) << shift_amount) - 1;
+
+    // Warm Up phase: we don't have enough digits to start writing, so just
+    // read them into the accumulator.
+    while (accumulator >> shift_amount == 0) {
+      uint64_t read_digit = 0;
+      // If there are still digits to read, read the next one, else the digit is
+      // assumed to be 0.
+      if (read_index < this->num_digits) {
+        read_digit = this->digits[read_index];
+      }
+      accumulator = accumulator * 10 + read_digit;
+      ++read_index;
+    }
+
+    // Shift the decimal point by the number of digits it took to fill the
+    // accumulator.
+    this->decimal_point -= read_index - 1;
+
+    // Middle phase: we have enough digits to write, as well as more digits to
+    // read. Keep reading until we run out of digits.
+    while (read_index < this->num_digits) {
+      uint64_t read_digit = this->digits[read_index];
+      uint64_t write_digit = accumulator >> shift_amount;
+      accumulator &= shift_mask;
+      this->digits[write_index] = static_cast<uint8_t>(write_digit);
+      accumulator = accumulator * 10 + read_digit;
+      ++read_index;
+      ++write_index;
+    }
+
+    // Cool Down phase: All of the readable digits have been read, so just write
+    // the remainder, while treating any more digits as 0.
+    while (accumulator > 0) {
+      uint64_t write_digit = accumulator >> shift_amount;
+      accumulator &= shift_mask;
+      if (write_index < MAX_NUM_DIGITS) {
+        this->digits[write_index] = static_cast<uint8_t>(write_digit);
+        ++write_index;
+      } else if (write_digit > 0) {
+        this->truncated = true;
+      }
+      accumulator = accumulator * 10;
+    }
+    this->num_digits = write_index;
+    this->trim_trailing_zeroes();
+  }
+
+  // Perform a digitwise binary non-rounding left shift on this value by
+  // shift_amount. The shift_amount can't be more than MAX_SHIFT_AMOUNT to
+  // prevent overflow.
+  LIBC_INLINE void left_shift(uint32_t shift_amount) {
+    uint32_t new_digits = this->get_num_new_digits(shift_amount);
+
+    int32_t read_index = static_cast<int32_t>(this->num_digits - 1);
+    uint32_t write_index = this->num_digits + new_digits;
+
+    uint64_t accumulator = 0;
+
+    // No Warm Up phase. Since we're putting digits in at the top and taking
+    // digits from the bottom we don't have to wait for the accumulator to fill.
+
+    // Middle phase: while we have more digits to read, keep reading as well as
+    // writing.
+    while (read_index >= 0) {
+      accumulator += static_cast<uint64_t>(this->digits[read_index])
+                     << shift_amount;
+      uint64_t next_accumulator = accumulator / 10;
+      uint64_t write_digit = accumulator - (10 * next_accumulator);
+      --write_index;
+      if (write_index < MAX_NUM_DIGITS) {
+        this->digits[write_index] = static_cast<uint8_t>(write_digit);
+      } else if (write_digit != 0) {
+        this->truncated = true;
+      }
+      accumulator = next_accumulator;
+      --read_index;
+    }
+
+    // Cool Down phase: there are no more digits to read, so just write the
+    // remaining digits in the accumulator.
+    while (accumulator > 0) {
+      uint64_t next_accumulator = accumulator / 10;
+      uint64_t write_digit = accumulator - (10 * next_accumulator);
+      --write_index;
+      if (write_index < MAX_NUM_DIGITS) {
+        this->digits[write_index] = static_cast<uint8_t>(write_digit);
+      } else if (write_digit != 0) {
+        this->truncated = true;
+      }
+      accumulator = next_accumulator;
+    }
+
+    this->num_digits += new_digits;
+    if (this->num_digits > MAX_NUM_DIGITS) {
+      this->num_digits = MAX_NUM_DIGITS;
+    }
+    this->decimal_point += new_digits;
+    this->trim_trailing_zeroes();
+  }
+
+public:
+  // num_string is assumed to be a string of numeric characters. It doesn't
+  // handle leading spaces.
+  LIBC_INLINE
+  HighPrecisionDecimal(
+      const char *__restrict num_string,
+      const size_t num_len = cpp::numeric_limits<size_t>::max()) {
+    bool saw_dot = false;
+    size_t num_cur = 0;
+    // This counts the digits in the number, even if there isn't space to store
+    // them all.
+    uint32_t total_digits = 0;
+    while (num_cur < num_len &&
+           (isdigit(num_string[num_cur]) || num_string[num_cur] == '.')) {
+      if (num_string[num_cur] == '.') {
+        if (saw_dot) {
+          break;
+        }
+        this->decimal_point = static_cast<int32_t>(total_digits);
+        saw_dot = true;
+      } else {
+        if (num_string[num_cur] == '0' && this->num_digits == 0) {
+          --this->decimal_point;
+          ++num_cur;
+          continue;
+        }
+        ++total_digits;
+        if (this->num_digits < MAX_NUM_DIGITS) {
+          this->digits[this->num_digits] = static_cast<uint8_t>(
+              internal::b36_char_to_int(num_string[num_cur]));
+          ++this->num_digits;
+        } else if (num_string[num_cur] != '0') {
+          this->truncated = true;
+        }
+      }
+      ++num_cur;
+    }
+
+    if (!saw_dot)
+      this->decimal_point = static_cast<int32_t>(total_digits);
+
+    if (num_cur < num_len &&
+        (num_string[num_cur] == 'e' || num_string[num_cur] == 'E')) {
+      ++num_cur;
+      if (isdigit(num_string[num_cur]) || num_string[num_cur] == '+' ||
+          num_string[num_cur] == '-') {
+        auto result =
+            strtointeger<int32_t>(num_string + num_cur, 10, num_len - num_cur);
+        if (result.has_error()) {
+          // TODO: handle error
+        }
+        int32_t add_to_exponent = result.value;
+
+        // Here we do this operation as int64 to avoid overflow.
+        int64_t temp_exponent = static_cast<int64_t>(this->decimal_point) +
+                                static_cast<int64_t>(add_to_exponent);
+
+        // Theoretically these numbers should be MAX_BIASED_EXPONENT for long
+        // double, but that should be ~16,000 which is much less than 1 << 30.
+        if (temp_exponent > (1 << 30)) {
+          temp_exponent = (1 << 30);
+        } else if (temp_exponent < -(1 << 30)) {
+          temp_exponent = -(1 << 30);
+        }
+        this->decimal_point = static_cast<int32_t>(temp_exponent);
+      }
+    }
+
+    this->trim_trailing_zeroes();
+  }
+
+  // Binary shift left (shift_amount > 0) or right (shift_amount < 0)
+  LIBC_INLINE void shift(int shift_amount) {
+    if (shift_amount == 0) {
+      return;
+    }
+    // Left
+    else if (shift_amount > 0) {
+      while (static_cast<uint32_t>(shift_amount) > MAX_SHIFT_AMOUNT) {
+        this->left_shift(MAX_SHIFT_AMOUNT);
+        shift_amount -= MAX_SHIFT_AMOUNT;
+      }
+      this->left_shift(static_cast<uint32_t>(shift_amount));
+    }
+    // Right
+    else {
+      while (static_cast<uint32_t>(shift_amount) < -MAX_SHIFT_AMOUNT) {
+        this->right_shift(MAX_SHIFT_AMOUNT);
+        shift_amount += MAX_SHIFT_AMOUNT;
+      }
+      this->right_shift(static_cast<uint32_t>(-shift_amount));
+    }
+  }
+
+  // Round the number represented to the closest value of unsigned int type T.
+  // This is done ignoring overflow.
+  template <class T>
+  LIBC_INLINE T
+  round_to_integer_type(RoundDirection round = RoundDirection::Nearest) {
+    T result = 0;
+    uint32_t cur_digit = 0;
+
+    while (static_cast<int32_t>(cur_digit) < this->decimal_point &&
+           cur_digit < this->num_digits) {
+      result = result * 10 + (this->digits[cur_digit]);
+      ++cur_digit;
+    }
+
+    // If there are implicit 0s at the end of the number, include those.
+    while (static_cast<int32_t>(cur_digit) < this->decimal_point) {
+      result *= 10;
+      ++cur_digit;
+    }
+    return result +
+           static_cast<T>(this->should_round_up(this->decimal_point, round));
+  }
+
+  // Extra functions for testing.
+
+  LIBC_INLINE uint8_t *get_digits() { return this->digits; }
+  LIBC_INLINE uint32_t get_num_digits() { return this->num_digits; }
+  LIBC_INLINE int32_t get_decimal_point() { return this->decimal_point; }
+  LIBC_INLINE void set_truncated(bool trunc) { this->truncated = trunc; }
+};
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_HIGH_PRECISION_DECIMAL_H
diff --git a/contrib/llvm-project/libc/src/__support/integer_literals.h b/contrib/llvm-project/libc/src/__support/integer_literals.h
new file mode 100644
index 000000000000..f68b7ef12c87
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/integer_literals.h
@@ -0,0 +1,180 @@
+//===-- User literal for unsigned integers ----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// This set of user defined literals allows uniform constructions of constants
+// up to 256 bits and also help with unit tests (EXPECT_EQ requires the same
+// type for LHS and RHS).
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_INTEGER_LITERALS_H
+#define LLVM_LIBC_SRC___SUPPORT_INTEGER_LITERALS_H
+
+#include "src/__support/CPP/limits.h" // CHAR_BIT
+#include "src/__support/ctype_utils.h"
+#include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/macros/config.h"
+#include "src/__support/uint128.h" // UInt128
+#include <stddef.h>                // size_t
+#include <stdint.h>                // uintxx_t
+
+namespace LIBC_NAMESPACE_DECL {
+
+LIBC_INLINE constexpr uint8_t operator""_u8(unsigned long long value) {
+  return static_cast<uint8_t>(value);
+}
+
+LIBC_INLINE constexpr uint16_t operator""_u16(unsigned long long value) {
+  return static_cast<uint16_t>(value);
+}
+
+LIBC_INLINE constexpr uint32_t operator""_u32(unsigned long long value) {
+  return static_cast<uint32_t>(value);
+}
+
+LIBC_INLINE constexpr uint64_t operator""_u64(unsigned long long value) {
+  return static_cast<uint64_t>(value);
+}
+
+namespace internal {
+
+// Creates a T by reading digits from an array.
+template <typename T>
+LIBC_INLINE constexpr T accumulate(int base, const uint8_t *digits,
+                                   size_t size) {
+  T value{};
+  for (; size; ++digits, --size) {
+    value *= static_cast<unsigned int>(base);
+    value += *digits;
+  }
+  return value;
+}
+
+// A static buffer to hold the digits for a T.
+template <typename T, int base> struct DigitBuffer {
+  static_assert(base == 2 || base == 10 || base == 16);
+  // One character provides log2(base) bits.
+  // Base 2 and 16 provide exactly one and four bits per character respectively.
+  // For base 10, a character provides log2(10) ≈ 3.32... which we round to 3
+  // for the purpose of buffer allocation.
+  LIBC_INLINE_VAR static constexpr size_t BITS_PER_DIGIT = base == 2    ? 1
+                                                           : base == 10 ? 3
+                                                           : base == 16 ? 4
+                                                                        : 0;
+  LIBC_INLINE_VAR static constexpr size_t MAX_DIGITS =
+      sizeof(T) * CHAR_BIT / BITS_PER_DIGIT;
+  LIBC_INLINE_VAR static constexpr uint8_t INVALID_DIGIT = 255;
+
+  uint8_t digits[MAX_DIGITS] = {};
+  size_t size = 0;
+
+  constexpr DigitBuffer(const char *str) {
+    for (; *str != '\0'; ++str)
+      push(*str);
+  }
+
+  // Adds a single character to this buffer.
+  LIBC_INLINE constexpr void push(char c) {
+    if (c == '\'')
+      return; // ' is valid but not taken into account.
+    const int b36_val = internal::b36_char_to_int(c);
+    const uint8_t value = static_cast<uint8_t>(
+        b36_val < base && (b36_val != 0 || c == '0') ? b36_val : INVALID_DIGIT);
+    if (value == INVALID_DIGIT || size >= MAX_DIGITS) {
+      // During constant evaluation `__builtin_unreachable` will halt the
+      // compiler as it is not executable. This is preferable over `assert` that
+      // will only trigger in debug mode. Also we can't use `static_assert`
+      // because `value` and `size` are not constant.
+      __builtin_unreachable(); // invalid or too many characters.
+    }
+    digits[size] = value;
+    ++size;
+  }
+};
+
+// Generic implementation for native types (including __uint128_t or ExtInt
+// where available).
+template <typename T> struct Parser {
+  template <int base> LIBC_INLINE static constexpr T parse(const char *str) {
+    const DigitBuffer<T, base> buffer(str);
+    return accumulate<T>(base, buffer.digits, buffer.size);
+  }
+};
+
+// Specialization for UInt<N>.
+// Because this code runs at compile time we try to make it efficient. For
+// binary and hexadecimal formats we read digits by chunks of 64 bits and
+// produce the BigInt internal representation direcly. For decimal numbers we
+// go the slow path and use slower BigInt arithmetic.
+template <size_t N> struct Parser<LIBC_NAMESPACE::UInt<N>> {
+  using UIntT = UInt<N>;
+  template <int base> static constexpr UIntT parse(const char *str) {
+    const DigitBuffer<UIntT, base> buffer(str);
+    if constexpr (base == 10) {
+      // Slow path, we sum and multiply BigInt for each digit.
+      return accumulate<UIntT>(base, buffer.digits, buffer.size);
+    } else {
+      // Fast path, we consume blocks of WordType and creates the BigInt's
+      // internal representation directly.
+      using WordArrayT = decltype(UIntT::val);
+      using WordType = typename WordArrayT::value_type;
+      WordArrayT array = {};
+      size_t size = buffer.size;
+      const uint8_t *digit_ptr = buffer.digits + size;
+      for (size_t i = 0; i < array.size(); ++i) {
+        constexpr size_t DIGITS = DigitBuffer<WordType, base>::MAX_DIGITS;
+        const size_t chunk = size > DIGITS ? DIGITS : size;
+        digit_ptr -= chunk;
+        size -= chunk;
+        array[i] = accumulate<WordType>(base, digit_ptr, chunk);
+      }
+      return UIntT(array);
+    }
+  }
+};
+
+// Detects the base of the number and dispatches to the right implementation.
+template <typename T>
+LIBC_INLINE constexpr T parse_with_prefix(const char *ptr) {
+  using P = Parser<T>;
+  if (ptr == nullptr)
+    return T();
+  if (ptr[0] == '0') {
+    if (ptr[1] == 'b')
+      return P::template parse<2>(ptr + 2);
+    if (ptr[1] == 'x')
+      return P::template parse<16>(ptr + 2);
+  }
+  return P::template parse<10>(ptr);
+}
+
+} // namespace internal
+
+LIBC_INLINE constexpr UInt<96> operator""_u96(const char *x) {
+  return internal::parse_with_prefix<UInt<96>>(x);
+}
+
+LIBC_INLINE constexpr UInt128 operator""_u128(const char *x) {
+  return internal::parse_with_prefix<UInt128>(x);
+}
+
+LIBC_INLINE constexpr auto operator""_u256(const char *x) {
+  return internal::parse_with_prefix<UInt<256>>(x);
+}
+
+template <typename T> LIBC_INLINE constexpr T parse_bigint(const char *ptr) {
+  if (ptr == nullptr)
+    return T();
+  if (ptr[0] == '-' || ptr[0] == '+') {
+    auto positive = internal::parse_with_prefix<T>(ptr + 1);
+    return ptr[0] == '-' ? -positive : positive;
+  }
+  return internal::parse_with_prefix<T>(ptr);
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_INTEGER_LITERALS_H
diff --git a/contrib/llvm-project/libc/src/__support/integer_operations.h b/contrib/llvm-project/libc/src/__support/integer_operations.h
new file mode 100644
index 000000000000..4ecff70a6175
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/integer_operations.h
@@ -0,0 +1,33 @@
+//===-- Utils for abs and friends -------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_INTEGER_OPERATIONS_H
+#define LLVM_LIBC_SRC___SUPPORT_INTEGER_OPERATIONS_H
+
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+template <typename T>
+LIBC_INLINE static constexpr cpp::enable_if_t<cpp::is_integral_v<T>, T>
+integer_abs(T n) {
+  return (n < 0) ? -n : n;
+}
+
+template <typename T>
+LIBC_INLINE static constexpr cpp::enable_if_t<cpp::is_integral_v<T>, void>
+integer_rem_quo(T x, T y, T &quot, T &rem) {
+  quot = x / y;
+  rem = x % y;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_INTEGER_OPERATIONS_H
diff --git a/contrib/llvm-project/libc/src/__support/integer_to_string.h b/contrib/llvm-project/libc/src/__support/integer_to_string.h
new file mode 100644
index 000000000000..65bdcf16b386
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/integer_to_string.h
@@ -0,0 +1,498 @@
+//===-- Utilities to convert integral values to string ----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Converts an integer to a string.
+//
+// By default, the string is written as decimal to an internal buffer and
+// accessed via the 'view' method.
+//
+//   IntegerToString<int> buffer(42);
+//   cpp::string_view view = buffer.view();
+//
+// The buffer is allocated on the stack and its size is so that the conversion
+// always succeeds.
+//
+// It is also possible to write the data to a preallocated buffer, but this may
+// fail.
+//
+//   char buffer[8];
+//   if (auto maybe_view = IntegerToString<int>::write_to_span(buffer, 42)) {
+//     cpp::string_view view = *maybe_view;
+//   }
+//
+// The first template parameter is the type of the integer.
+// The second template parameter defines how the integer is formatted.
+// Available default are 'radix::Bin', 'radix::Oct', 'radix::Dec' and
+// 'radix::Hex'.
+//
+// For 'radix::Bin', 'radix::Oct' and 'radix::Hex' the value is always
+// interpreted as a positive type but 'radix::Dec' will honor negative values.
+// e.g.,
+//
+//   IntegerToString<int8_t>(-1)             // "-1"
+//   IntegerToString<int8_t, radix::Dec>(-1) // "-1"
+//   IntegerToString<int8_t, radix::Bin>(-1) // "11111111"
+//   IntegerToString<int8_t, radix::Oct>(-1) // "377"
+//   IntegerToString<int8_t, radix::Hex>(-1) // "ff"
+//
+// Additionnally, the format can be changed by navigating the subtypes:
+//  - WithPrefix    : Adds "0b", "0", "0x" for binary, octal and hexadecimal
+//  - WithWidth<XX> : Pad string to XX characters filling leading digits with 0
+//  - Uppercase     : Use uppercase letters (only for HexString)
+//  - WithSign      : Prepend '+' for positive values (only for DecString)
+//
+// Examples
+// --------
+//   IntegerToString<int8_t, radix::Dec::WithWidth<2>::WithSign>(0)     : "+00"
+//   IntegerToString<int8_t, radix::Dec::WithWidth<2>::WithSign>(-1)    : "-01"
+//   IntegerToString<uint8_t, radix::Hex::WithPrefix::Uppercase>(255)   : "0xFF"
+//   IntegerToString<uint8_t, radix::Hex::WithWidth<4>::Uppercase>(255) : "00FF"
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_INTEGER_TO_STRING_H
+#define LLVM_LIBC_SRC___SUPPORT_INTEGER_TO_STRING_H
+
+#include <stdint.h>
+
+#include "src/__support/CPP/algorithm.h" // max
+#include "src/__support/CPP/array.h"
+#include "src/__support/CPP/bit.h"
+#include "src/__support/CPP/limits.h"
+#include "src/__support/CPP/optional.h"
+#include "src/__support/CPP/span.h"
+#include "src/__support/CPP/string_view.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/big_int.h" // make_integral_or_big_int_unsigned_t
+#include "src/__support/common.h"
+#include "src/__support/ctype_utils.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace details {
+
+template <uint8_t base, bool prefix = false, bool force_sign = false,
+          bool is_uppercase = false, size_t min_digits = 1>
+struct Fmt {
+  static constexpr uint8_t BASE = base;
+  static constexpr size_t MIN_DIGITS = min_digits;
+  static constexpr bool IS_UPPERCASE = is_uppercase;
+  static constexpr bool PREFIX = prefix;
+  static constexpr char FORCE_SIGN = force_sign;
+
+  using WithPrefix = Fmt<BASE, true, FORCE_SIGN, IS_UPPERCASE, MIN_DIGITS>;
+  using WithSign = Fmt<BASE, PREFIX, true, IS_UPPERCASE, MIN_DIGITS>;
+  using Uppercase = Fmt<BASE, PREFIX, FORCE_SIGN, true, MIN_DIGITS>;
+  template <size_t value>
+  using WithWidth = Fmt<BASE, PREFIX, FORCE_SIGN, IS_UPPERCASE, value>;
+
+  // Invariants
+  static constexpr uint8_t NUMERICAL_DIGITS = 10;
+  static constexpr uint8_t ALPHA_DIGITS = 26;
+  static constexpr uint8_t MAX_DIGIT = NUMERICAL_DIGITS + ALPHA_DIGITS;
+  static_assert(BASE > 1 && BASE <= MAX_DIGIT);
+  static_assert(!IS_UPPERCASE || BASE > 10, "Uppercase is only for radix > 10");
+  static_assert(!FORCE_SIGN || BASE == 10, "WithSign is only for radix == 10");
+  static_assert(!PREFIX || (BASE == 2 || BASE == 8 || BASE == 16),
+                "WithPrefix is only for radix == 2, 8 or 16");
+};
+
+// Move this to a separate header since it might be useful elsewhere.
+template <bool forward> class StringBufferWriterImpl {
+  cpp::span<char> buffer;
+  size_t index = 0;
+  bool out_of_range = false;
+
+  LIBC_INLINE size_t location() const {
+    return forward ? index : buffer.size() - 1 - index;
+  }
+
+public:
+  StringBufferWriterImpl(const StringBufferWriterImpl &) = delete;
+  StringBufferWriterImpl(cpp::span<char> buffer) : buffer(buffer) {}
+
+  LIBC_INLINE size_t size() const { return index; }
+  LIBC_INLINE size_t remainder_size() const { return buffer.size() - size(); }
+  LIBC_INLINE bool empty() const { return size() == 0; }
+  LIBC_INLINE bool full() const { return size() == buffer.size(); }
+  LIBC_INLINE bool ok() const { return !out_of_range; }
+
+  LIBC_INLINE StringBufferWriterImpl &push(char c) {
+    if (ok()) {
+      if (!full()) {
+        buffer[location()] = c;
+        ++index;
+      } else {
+        out_of_range = true;
+      }
+    }
+    return *this;
+  }
+
+  LIBC_INLINE cpp::span<char> remainder_span() const {
+    return forward ? buffer.last(remainder_size())
+                   : buffer.first(remainder_size());
+  }
+
+  LIBC_INLINE cpp::span<char> buffer_span() const {
+    return forward ? buffer.first(size()) : buffer.last(size());
+  }
+
+  LIBC_INLINE cpp::string_view buffer_view() const {
+    const auto s = buffer_span();
+    return {s.data(), s.size()};
+  }
+};
+
+using StringBufferWriter = StringBufferWriterImpl<true>;
+using BackwardStringBufferWriter = StringBufferWriterImpl<false>;
+
+} // namespace details
+
+namespace radix {
+
+using Bin = details::Fmt<2>;
+using Oct = details::Fmt<8>;
+using Dec = details::Fmt<10>;
+using Hex = details::Fmt<16>;
+template <size_t radix> using Custom = details::Fmt<radix>;
+
+} // namespace radix
+
+// Extract the low-order decimal digit from a value of integer type T. The
+// returned value is the digit itself, from 0 to 9. The input value is passed
+// by reference, and modified by dividing by 10, so that iterating this
+// function extracts all the digits of the original number one at a time from
+// low to high.
+template <typename T>
+LIBC_INLINE cpp::enable_if_t<cpp::is_integral_v<T>, uint8_t>
+extract_decimal_digit(T &value) {
+  const uint8_t digit(static_cast<uint8_t>(value % 10));
+  // For built-in integer types, we assume that an adequately fast division is
+  // available. If hardware division isn't implemented, then with a divisor
+  // known at compile time the compiler might be able to generate an optimized
+  // sequence instead.
+  value /= 10;
+  return digit;
+}
+
+// A specialization of extract_decimal_digit for the BigInt type in big_int.h,
+// avoiding the use of general-purpose BigInt division which is very slow.
+template <typename T>
+LIBC_INLINE cpp::enable_if_t<is_big_int_v<T>, uint8_t>
+extract_decimal_digit(T &value) {
+  // There are two essential ways you can turn n into (n/10,n%10). One is
+  // ordinary integer division. The other is a modular-arithmetic approach in
+  // which you first compute n%10 by bit twiddling, then subtract it off to get
+  // a value that is definitely a multiple of 10. Then you divide that by 10 in
+  // two steps: shift right to divide off a factor of 2, and then divide off a
+  // factor of 5 by multiplying by the modular inverse of 5 mod 2^BITS. (That
+  // last step only works if you know there's no remainder, which is why you
+  // had to subtract off the output digit first.)
+  //
+  // Either approach can be made to work in linear time. This code uses the
+  // modular-arithmetic technique, because the other approach either does a lot
+  // of integer divisions (requiring a fast hardware divider), or else uses a
+  // "multiply by an approximation to the reciprocal" technique which depends
+  // on careful error analysis which might go wrong in an untested edge case.
+
+  using Word = typename T::word_type;
+
+  // Find the remainder (value % 10). We do this by breaking up the input
+  // integer into chunks of size WORD_SIZE/2, so that the sum of them doesn't
+  // overflow a Word. Then we sum all the half-words times 6, except the bottom
+  // one, which is added to that sum without scaling.
+  //
+  // Why 6? Because you can imagine that the original number had the form
+  //
+  //   halfwords[0] + K*halfwords[1] + K^2*halfwords[2] + ...
+  //
+  // where K = 2^(WORD_SIZE/2). Since WORD_SIZE is expected to be a multiple of
+  // 8, that makes WORD_SIZE/2 a multiple of 4, so that K is a power of 16. And
+  // all powers of 16 (larger than 1) are congruent to 6 mod 10, by induction:
+  // 16 itself is, and 6^2=36 is also congruent to 6.
+  Word acc_remainder = 0;
+  constexpr Word HALFWORD_BITS = T::WORD_SIZE / 2;
+  constexpr Word HALFWORD_MASK = ((Word(1) << HALFWORD_BITS) - 1);
+  // Sum both halves of all words except the low one.
+  for (size_t i = 1; i < T::WORD_COUNT; i++) {
+    acc_remainder += value.val[i] >> HALFWORD_BITS;
+    acc_remainder += value.val[i] & HALFWORD_MASK;
+  }
+  // Add the high half of the low word. Then we have everything that needs to
+  // be multiplied by 6, so do that.
+  acc_remainder += value.val[0] >> HALFWORD_BITS;
+  acc_remainder *= 6;
+  // Having multiplied it by 6, add the lowest half-word, and then reduce mod
+  // 10 by normal integer division to finish.
+  acc_remainder += value.val[0] & HALFWORD_MASK;
+  uint8_t digit = static_cast<uint8_t>(acc_remainder % 10);
+
+  // Now we have the output digit. Subtract it from the input value, and shift
+  // right to divide by 2.
+  value -= digit;
+  value >>= 1;
+
+  // Now all that's left is to multiply by the inverse of 5 mod 2^BITS. No
+  // matter what the value of BITS, the inverse of 5 has the very convenient
+  // form 0xCCCC...CCCD, with as many C hex digits in the middle as necessary.
+  //
+  // We could construct a second BigInt with all words 0xCCCCCCCCCCCCCCCC,
+  // increment the bottom word, and call a general-purpose multiply function.
+  // But we can do better, by taking advantage of the regularity: we can do
+  // this particular operation in linear time, whereas a general multiplier
+  // would take superlinear time (quadratic in small cases).
+  //
+  // To begin with, instead of computing n*0xCCCC...CCCD, we'll compute
+  // n*0xCCCC...CCCC and then add it to the original n. Then all the words of
+  // the multiplier have the same value 0xCCCCCCCCCCCCCCCC, which I'll just
+  // denote as C. If we also write t = 2^WORD_SIZE, and imagine (as an example)
+  // that the input number has three words x,y,z with x being the low word,
+  // then we're computing
+  //
+  //   (x + y t + z t^2) * (C + C t + C t^2)
+  //
+  // = x C + y C t + z C t^2
+  //       + x C t + y C t^2 + z C t^3
+  //               + x C t^2 + y C t^3 + z C t^4
+  //
+  // but we're working mod t^3, so the high-order terms vanish and this becomes
+  //
+  //   x C + y C t + z C t^2
+  //       + x C t + y C t^2
+  //               + x C t^2
+  //
+  // = x C + (x+y) C t + (x+y+z) C t^2
+  //
+  // So all you have to do is to work from the low word of the integer upwards,
+  // accumulating C times the sum of all the words you've seen so far to get
+  // x*C, (x+y)*C, (x+y+z)*C and so on. In each step you add another product to
+  // the accumulator, and add the accumulator to the corresponding word of the
+  // original number (so that we end up with value*CCCD, not just value*CCCC).
+  //
+  // If you do that literally, then your accumulator has to be three words
+  // wide, because the sum of words can overflow into a second word, and
+  // multiplying by C adds another word. But we can do slightly better by
+  // breaking each product word*C up into a bottom half and a top half. If we
+  // write x*C = xl + xh*t, and similarly for y and z, then our sum becomes
+  //
+  //   (xl + xh t) + (yl + yh t) t + (zl + zh t) t^2
+  //               + (xl + xh t) t + (yl + yh t) t^2
+  //                               + (xl + xh t) t^2
+  //
+  // and if you expand out again, collect terms, and discard t^3 terms, you get
+  //
+  //   (xl)
+  // + (xl + xh + yl) t
+  // + (xl + xh + yl + yh + zl) t^2
+  //
+  // in which each coefficient is the sum of all the low words of the products
+  // up to _and including_ the current word, plus all the high words up to but
+  // _not_ including the current word. So now you only have to retain two words
+  // of sum instead of three.
+  //
+  // We do this entire procedure in a single in-place pass over the input
+  // number, reading each word to make its product with C and then adding the
+  // low word of the accumulator to it.
+  constexpr Word C = Word(-1) / 5 * 4; // calculate 0xCCCC as 4/5 of 0xFFFF
+  Word acc_lo = 0, acc_hi = 0; // accumulator of all the half-products so far
+  Word carry_bit, carry_word = 0;
+
+  for (size_t i = 0; i < T::WORD_COUNT; i++) {
+    // Make the two-word product of C with the current input word.
+    multiword::DoubleWide<Word> product = multiword::mul2(C, value.val[i]);
+
+    // Add the low half of the product to our accumulator, but not yet the high
+    // half.
+    acc_lo = add_with_carry<Word>(acc_lo, product[0], 0, carry_bit);
+    acc_hi += carry_bit;
+
+    // Now the accumulator contains exactly the value we need to add to the
+    // current input word. Add it, plus any carries from lower words, and make
+    // a new word of carry data to propagate into the next iteration.
+    value.val[i] = add_with_carry<Word>(value.val[i], carry_word, 0, carry_bit);
+    carry_word = acc_hi + carry_bit;
+    value.val[i] = add_with_carry<Word>(value.val[i], acc_lo, 0, carry_bit);
+    carry_word += carry_bit;
+
+    // Now add the high half of the current product to our accumulator.
+    acc_lo = add_with_carry<Word>(acc_lo, product[1], 0, carry_bit);
+    acc_hi += carry_bit;
+  }
+
+  return digit;
+}
+
+// See file header for documentation.
+template <typename T, typename Fmt = radix::Dec> class IntegerToString {
+  static_assert(cpp::is_integral_v<T> || is_big_int_v<T>);
+
+  LIBC_INLINE static constexpr size_t compute_buffer_size() {
+    constexpr auto MAX_DIGITS = []() -> size_t {
+      // We size the string buffer for base 10 using an approximation algorithm:
+      //
+      //   size = ceil(sizeof(T) * 5 / 2)
+      //
+      // If sizeof(T) is 1, then size is 3 (actually need 3)
+      // If sizeof(T) is 2, then size is 5 (actually need 5)
+      // If sizeof(T) is 4, then size is 10 (actually need 10)
+      // If sizeof(T) is 8, then size is 20 (actually need 20)
+      // If sizeof(T) is 16, then size is 40 (actually need 39)
+      //
+      // NOTE: The ceil operation is actually implemented as
+      //     floor(((sizeof(T) * 5) + 1) / 2)
+      // where floor operation is just integer division.
+      //
+      // This estimation grows slightly faster than the actual value, but the
+      // overhead is small enough to tolerate.
+      if constexpr (Fmt::BASE == 10)
+        return ((sizeof(T) * 5) + 1) / 2;
+      // For other bases, we approximate by rounding down to the nearest power
+      // of two base, since the space needed is easy to calculate and it won't
+      // overestimate by too much.
+      constexpr auto FLOOR_LOG_2 = [](size_t num) -> size_t {
+        size_t i = 0;
+        for (; num > 1; num /= 2)
+          ++i;
+        return i;
+      };
+      constexpr size_t BITS_PER_DIGIT = FLOOR_LOG_2(Fmt::BASE);
+      return ((sizeof(T) * 8 + (BITS_PER_DIGIT - 1)) / BITS_PER_DIGIT);
+    };
+    constexpr size_t DIGIT_SIZE = cpp::max(MAX_DIGITS(), Fmt::MIN_DIGITS);
+    constexpr size_t SIGN_SIZE = Fmt::BASE == 10 ? 1 : 0;
+    constexpr size_t PREFIX_SIZE = Fmt::PREFIX ? 2 : 0;
+    return DIGIT_SIZE + SIGN_SIZE + PREFIX_SIZE;
+  }
+
+  static constexpr size_t BUFFER_SIZE = compute_buffer_size();
+  static_assert(BUFFER_SIZE > 0);
+
+  // An internal stateless structure that handles the number formatting logic.
+  struct IntegerWriter {
+    static_assert(cpp::is_integral_v<T> || is_big_int_v<T>);
+    using UNSIGNED_T = make_integral_or_big_int_unsigned_t<T>;
+
+    LIBC_INLINE static char digit_char(uint8_t digit) {
+      const int result = internal::int_to_b36_char(digit);
+      return static_cast<char>(Fmt::IS_UPPERCASE ? internal::toupper(result)
+                                                 : result);
+    }
+
+    LIBC_INLINE static void
+    write_unsigned_number(UNSIGNED_T value,
+                          details::BackwardStringBufferWriter &sink) {
+      for (; sink.ok() && value != 0; value /= Fmt::BASE) {
+        const uint8_t digit(static_cast<uint8_t>(value % Fmt::BASE));
+        sink.push(digit_char(digit));
+      }
+    }
+
+    LIBC_INLINE static void
+    write_unsigned_number_dec(UNSIGNED_T value,
+                              details::BackwardStringBufferWriter &sink) {
+      while (sink.ok() && value != 0) {
+        const uint8_t digit = extract_decimal_digit(value);
+        sink.push(digit_char(digit));
+      }
+    }
+
+    // Returns the absolute value of 'value' as 'UNSIGNED_T'.
+    LIBC_INLINE static UNSIGNED_T abs(T value) {
+      if (cpp::is_unsigned_v<T> || value >= 0)
+        return static_cast<UNSIGNED_T>(value); // already of the right sign.
+
+      // Signed integers are asymmetric (e.g., int8_t ∈ [-128, 127]).
+      // Thus negating the type's minimum value would overflow.
+      // From C++20 on, signed types are guaranteed to be represented as 2's
+      // complement. We take advantage of this representation and negate the
+      // value by using the exact same bit representation, e.g.,
+      // binary : 0b1000'0000
+      // int8_t : -128
+      // uint8_t:  128
+
+      // Note: the compiler can completely optimize out the two branches and
+      // replace them by a simple negate instruction.
+      // https://godbolt.org/z/hE7zahT9W
+      if (value == cpp::numeric_limits<T>::min()) {
+        return cpp::bit_cast<UNSIGNED_T>(value);
+      } else {
+        return static_cast<UNSIGNED_T>(
+            -value); // legal and representable both as T and UNSIGNED_T.`
+      }
+    }
+
+    LIBC_INLINE static void write(T value,
+                                  details::BackwardStringBufferWriter &sink) {
+      if constexpr (Fmt::BASE == 10) {
+        write_unsigned_number_dec(abs(value), sink);
+      } else {
+        write_unsigned_number(static_cast<UNSIGNED_T>(value), sink);
+      }
+      // width
+      while (sink.ok() && sink.size() < Fmt::MIN_DIGITS)
+        sink.push('0');
+      // sign
+      if constexpr (Fmt::BASE == 10) {
+        if (value < 0)
+          sink.push('-');
+        else if (Fmt::FORCE_SIGN)
+          sink.push('+');
+      }
+      // prefix
+      if constexpr (Fmt::PREFIX) {
+        if constexpr (Fmt::BASE == 2) {
+          sink.push('b');
+          sink.push('0');
+        }
+        if constexpr (Fmt::BASE == 16) {
+          sink.push('x');
+          sink.push('0');
+        }
+        if constexpr (Fmt::BASE == 8) {
+          const cpp::string_view written = sink.buffer_view();
+          if (written.empty() || written.front() != '0')
+            sink.push('0');
+        }
+      }
+    }
+  };
+
+  cpp::array<char, BUFFER_SIZE> array;
+  size_t written = 0;
+
+public:
+  IntegerToString(const IntegerToString &) = delete;
+  IntegerToString(T value) {
+    details::BackwardStringBufferWriter writer(array);
+    IntegerWriter::write(value, writer);
+    written = writer.size();
+  }
+
+  [[nodiscard]] LIBC_INLINE static cpp::optional<cpp::string_view>
+  format_to(cpp::span<char> buffer, T value) {
+    details::BackwardStringBufferWriter writer(buffer);
+    IntegerWriter::write(value, writer);
+    if (writer.ok())
+      return cpp::string_view(buffer.data() + buffer.size() - writer.size(),
+                              writer.size());
+    return cpp::nullopt;
+  }
+
+  LIBC_INLINE static constexpr size_t buffer_size() { return BUFFER_SIZE; }
+
+  LIBC_INLINE size_t size() const { return written; }
+  LIBC_INLINE cpp::string_view view() && = delete;
+  LIBC_INLINE cpp::string_view view() const & {
+    return cpp::string_view(array.data() + array.size() - size(), size());
+  }
+};
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_INTEGER_TO_STRING_H
diff --git a/contrib/llvm-project/libc/src/__support/intrusive_list.h b/contrib/llvm-project/libc/src/__support/intrusive_list.h
new file mode 100644
index 000000000000..4bbd8a41abd6
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/intrusive_list.h
@@ -0,0 +1,66 @@
+//===-- Intrusive queue implementation. -------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// An intrusive list that implements the insque and remque semantics.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_INTRUSIVE_LIST_H
+#define LLVM_LIBC_SRC___SUPPORT_INTRUSIVE_LIST_H
+
+#include "common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+class IntrusiveList {
+  struct IntrusiveNodeHeader {
+    IntrusiveNodeHeader *next;
+    IntrusiveNodeHeader *prev;
+  };
+
+public:
+  LIBC_INLINE static void insert(void *elem, void *prev) {
+    auto elem_header = static_cast<IntrusiveNodeHeader *>(elem);
+    auto prev_header = static_cast<IntrusiveNodeHeader *>(prev);
+
+    if (!prev_header) {
+      // The list is linear and elem will be the only element.
+      elem_header->next = nullptr;
+      elem_header->prev = nullptr;
+      return;
+    }
+
+    auto next = prev_header->next;
+
+    elem_header->next = next;
+    elem_header->prev = prev_header;
+
+    prev_header->next = elem_header;
+    if (next)
+      next->prev = elem_header;
+  }
+
+  LIBC_INLINE static void remove(void *elem) {
+    auto elem_header = static_cast<IntrusiveNodeHeader *>(elem);
+
+    auto prev = elem_header->prev;
+    auto next = elem_header->next;
+
+    if (prev)
+      prev->next = next;
+    if (next)
+      next->prev = prev;
+  }
+};
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_INTRUSIVE_LIST_H
diff --git a/contrib/llvm-project/libc/src/__support/libc_assert.h b/contrib/llvm-project/libc/src/__support/libc_assert.h
new file mode 100644
index 000000000000..ada1795ccb80
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/libc_assert.h
@@ -0,0 +1,88 @@
+//===-- Definition of a libc internal assert macro --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_LIBC_ASSERT_H
+#define LLVM_LIBC_SRC___SUPPORT_LIBC_ASSERT_H
+
+#if defined(LIBC_COPT_USE_C_ASSERT) || !defined(LIBC_FULL_BUILD)
+
+// The build is configured to just use the public <assert.h> API
+// for libc's internal assertions.
+
+#include <assert.h>
+
+#define LIBC_ASSERT(COND) assert(COND)
+
+#else // Not LIBC_COPT_USE_C_ASSERT
+
+#include "src/__support/OSUtil/exit.h"
+#include "src/__support/OSUtil/io.h"
+#include "src/__support/integer_to_string.h"
+#include "src/__support/macros/attributes.h"   // For LIBC_INLINE
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h" // For LIBC_UNLIKELY
+
+namespace LIBC_NAMESPACE_DECL {
+
+// This is intended to be removed in a future patch to use a similar design to
+// below, but it's necessary for the external assert.
+LIBC_INLINE void report_assertion_failure(const char *assertion,
+                                          const char *filename, unsigned line,
+                                          const char *funcname) {
+  const IntegerToString<unsigned> line_buffer(line);
+  write_to_stderr(filename);
+  write_to_stderr(":");
+  write_to_stderr(line_buffer.view());
+  write_to_stderr(": Assertion failed: '");
+  write_to_stderr(assertion);
+  write_to_stderr("' in function: '");
+  write_to_stderr(funcname);
+  write_to_stderr("'\n");
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#ifdef LIBC_ASSERT
+#error "Unexpected: LIBC_ASSERT macro already defined"
+#endif
+
+// The public "assert" macro calls abort on failure. Should it be same here?
+// The libc internal assert can fire from anywhere inside the libc. So, to
+// avoid potential chicken-and-egg problems, it is simple to do an exit
+// on assertion failure instead of calling abort. We also don't want to use
+// __builtin_trap as it could potentially be implemented using illegal
+// instructions which can be very misleading when debugging.
+#ifdef NDEBUG
+#define LIBC_ASSERT(COND)                                                      \
+  do {                                                                         \
+  } while (false)
+#else
+
+// Convert __LINE__ to a string using macros. The indirection is necessary
+// because otherwise it will turn "__LINE__" into a string, not its value. The
+// value is evaluated in the indirection step.
+#define __LIBC_MACRO_TO_STR(x) #x
+#define __LIBC_MACRO_TO_STR_INDIR(y) __LIBC_MACRO_TO_STR(y)
+#define __LIBC_LINE_STR__ __LIBC_MACRO_TO_STR_INDIR(__LINE__)
+
+#define LIBC_ASSERT(COND)                                                      \
+  do {                                                                         \
+    if (LIBC_UNLIKELY(!(COND))) {                                              \
+      LIBC_NAMESPACE::write_to_stderr(__FILE__ ":" __LIBC_LINE_STR__           \
+                                               ": Assertion failed: '" #COND   \
+                                               "' in function: '");            \
+      LIBC_NAMESPACE::write_to_stderr(__PRETTY_FUNCTION__);                    \
+      LIBC_NAMESPACE::write_to_stderr("'\n");                                  \
+      LIBC_NAMESPACE::internal::exit(0xFF);                                    \
+    }                                                                          \
+  } while (false)
+#endif // NDEBUG
+
+#endif // LIBC_COPT_USE_C_ASSERT
+
+#endif // LLVM_LIBC_SRC___SUPPORT_LIBC_ASSERT_H
diff --git a/contrib/llvm-project/libc/src/__support/libc_errno.h b/contrib/llvm-project/libc/src/__support/libc_errno.h
new file mode 100644
index 000000000000..ab5f6a9c4b9d
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/libc_errno.h
@@ -0,0 +1,108 @@
+//===-- Implementation header for libc_errno --------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_LIBC_ERRNO_H
+#define LLVM_LIBC_SRC___SUPPORT_LIBC_ERRNO_H
+
+// This header is to be consumed by internal implementations, in which all of
+// them should refer to `libc_errno` instead of using `errno` directly from
+// <errno.h> header.
+
+// Unit and hermetic tests should:
+// - #include "src/__support/libc_errno.h"
+// - NOT #include <errno.h>
+// - Only use `libc_errno` in the code
+// - Depend on libc.src.errno.errno
+
+// Integration tests should:
+// - NOT #include "src/__support/libc_errno.h"
+// - #include <errno.h>
+// - Use regular `errno` in the code
+// - Still depend on libc.src.errno.errno
+
+// libc uses a fallback default value, either system or thread local.
+#define LIBC_ERRNO_MODE_DEFAULT 0
+// libc never stores a value; `errno` macro uses get link-time failure.
+#define LIBC_ERRNO_MODE_UNDEFINED 1
+// libc maintains per-thread state (requires C++ `thread_local` support).
+#define LIBC_ERRNO_MODE_THREAD_LOCAL 2
+// libc maintains shared state used by all threads, contrary to standard C
+// semantics unless always single-threaded; nothing prevents data races.
+#define LIBC_ERRNO_MODE_SHARED 3
+// libc doesn't maintain any internal state, instead the embedder must define
+// `int *__llvm_libc_errno(void);` C function.
+#define LIBC_ERRNO_MODE_EXTERNAL 4
+// libc uses system `<errno.h>` `errno` macro directly in the overlay mode; in
+// fullbuild mode, effectively the same as `LIBC_ERRNO_MODE_EXTERNAL`.
+// In this mode, the public C++ symbol `LIBC_NAMESPACE::libc_errno ` is still
+// exported and get redirected to the system `errno` inside its implementation.
+
+// TODO: Investigate deprecating LIBC_ERRNO_MODE_SYSTEM in favor of
+//       LIBC_ERRNO_MODE_SYSTEM_INLINE.
+//       https://github.com/llvm/llvm-project/issues/143454
+#define LIBC_ERRNO_MODE_SYSTEM 5
+// In this mode, the libc_errno is simply a macro resolved to `errno` from the
+// system header <errno.h>.  There is no need to link against the
+// `libc.src.errno.errno` object.
+#define LIBC_ERRNO_MODE_SYSTEM_INLINE 6
+
+#if !defined(LIBC_ERRNO_MODE) || LIBC_ERRNO_MODE == LIBC_ERRNO_MODE_DEFAULT
+#undef LIBC_ERRNO_MODE
+#if defined(LIBC_FULL_BUILD) || !defined(LIBC_COPT_PUBLIC_PACKAGING)
+#define LIBC_ERRNO_MODE LIBC_ERRNO_MODE_THREAD_LOCAL
+#else
+#define LIBC_ERRNO_MODE LIBC_ERRNO_MODE_SYSTEM
+#endif
+#endif // LIBC_ERRNO_MODE
+
+#if LIBC_ERRNO_MODE != LIBC_ERRNO_MODE_DEFAULT &&                              \
+    LIBC_ERRNO_MODE != LIBC_ERRNO_MODE_UNDEFINED &&                            \
+    LIBC_ERRNO_MODE != LIBC_ERRNO_MODE_THREAD_LOCAL &&                         \
+    LIBC_ERRNO_MODE != LIBC_ERRNO_MODE_SHARED &&                               \
+    LIBC_ERRNO_MODE != LIBC_ERRNO_MODE_EXTERNAL &&                             \
+    LIBC_ERRNO_MODE != LIBC_ERRNO_MODE_SYSTEM &&                               \
+    LIBC_ERRNO_MODE != LIBC_ERRNO_MODE_SYSTEM_INLINE
+#error LIBC_ERRNO_MODE must be one of the following values: \
+LIBC_ERRNO_MODE_DEFAULT, \
+LIBC_ERRNO_MODE_UNDEFINED, \
+LIBC_ERRNO_MODE_THREAD_LOCAL, \
+LIBC_ERRNO_MODE_SHARED, \
+LIBC_ERRNO_MODE_EXTERNAL, \
+LIBC_ERRNO_MODE_SYSTEM, \
+LIBC_ERRNO_MODE_SYSTEM_INLINE.
+#endif
+
+#if LIBC_ERRNO_MODE == LIBC_ERRNO_MODE_SYSTEM_INLINE
+
+#include <errno.h>
+
+#define libc_errno errno
+
+#else // !LIBC_ERRNO_MODE_SYSTEM_INLINE
+
+#include "hdr/errno_macros.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+extern "C" int *__llvm_libc_errno() noexcept;
+
+struct Errno {
+  void operator=(int);
+  operator int();
+};
+
+extern Errno libc_errno;
+
+} // namespace LIBC_NAMESPACE_DECL
+
+using LIBC_NAMESPACE::libc_errno;
+
+#endif // LIBC_ERRNO_MODE_SYSTEM_INLINE
+
+#endif // LLVM_LIBC_SRC___SUPPORT_LIBC_ERRNO_H
diff --git a/contrib/llvm-project/libc/src/__support/macros/README.md b/contrib/llvm-project/libc/src/__support/macros/README.md
new file mode 100644
index 000000000000..ec6911ceacc7
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/macros/README.md
@@ -0,0 +1 @@
+This folder and its subfolders contain freestanding header only files.
diff --git a/contrib/llvm-project/libc/src/__support/macros/attributes.h b/contrib/llvm-project/libc/src/__support/macros/attributes.h
new file mode 100644
index 000000000000..c6474673de85
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/macros/attributes.h
@@ -0,0 +1,51 @@
+//===-- Portable attributes -------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// This header file defines macros for declaring attributes for functions,
+// types, and variables.
+//
+// These macros are used within llvm-libc and allow the compiler to optimize,
+// where applicable, certain function calls.
+//
+// Most macros here are exposing GCC or Clang features, and are stubbed out for
+// other compilers.
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MACROS_ATTRIBUTES_H
+#define LLVM_LIBC_SRC___SUPPORT_MACROS_ATTRIBUTES_H
+
+#include "properties/architectures.h"
+
+#ifndef __has_attribute
+#define __has_attribute(x) 0
+#endif
+
+#define LIBC_INLINE inline
+#define LIBC_INLINE_VAR inline
+#define LIBC_INLINE_ASM __asm__ __volatile__
+#define LIBC_UNUSED __attribute__((unused))
+
+#ifdef LIBC_TARGET_ARCH_IS_GPU
+#define LIBC_THREAD_LOCAL
+#else
+#define LIBC_THREAD_LOCAL thread_local
+#endif
+
+#if __cplusplus >= 202002L
+#define LIBC_CONSTINIT constinit
+#elif __has_attribute(__require_constant_initialization__)
+#define LIBC_CONSTINIT __attribute__((__require_constant_initialization__))
+#else
+#define LIBC_CONSTINIT
+#endif
+
+#if defined(__clang__) && __has_attribute(preferred_type)
+#define LIBC_PREFERED_TYPE(TYPE) [[clang::preferred_type(TYPE)]]
+#else
+#define LIBC_PREFERED_TYPE(TYPE)
+#endif
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MACROS_ATTRIBUTES_H
diff --git a/contrib/llvm-project/libc/src/__support/macros/config.h b/contrib/llvm-project/libc/src/__support/macros/config.h
new file mode 100644
index 000000000000..2ab0fba095e6
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/macros/config.h
@@ -0,0 +1,46 @@
+//===-- Portable attributes -------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// This header file defines a set of macros for checking the presence of
+// important compiler and platform features. Such macros can be used to
+// produce portable code by parameterizing compilation based on the presence or
+// lack of a given feature.
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MACROS_CONFIG_H
+#define LLVM_LIBC_SRC___SUPPORT_MACROS_CONFIG_H
+
+// Workaround for compilers that do not support builtin detection.
+// FIXME: This is only required for the GPU portion which should be moved.
+#ifndef __has_builtin
+#define __has_builtin(b) 0
+#endif
+
+// Compiler feature-detection.
+// clang.llvm.org/docs/LanguageExtensions.html#has-feature-and-has-extension
+#ifdef __has_feature
+#define LIBC_HAS_FEATURE(f) __has_feature(f)
+#else
+#define LIBC_HAS_FEATURE(f) 0
+#endif
+
+#ifdef __clang__
+// Declare a LIBC_NAMESPACE with hidden visibility. `namespace
+// LIBC_NAMESPACE_DECL {` should be used around all declarations and definitions
+// for libc internals as opposed to just `namespace LIBC_NAMESPACE {`. This
+// ensures that all declarations within this namespace have hidden
+// visibility, which optimizes codegen for uses of symbols defined in other
+// translation units in ways that can be necessary for correctness by avoiding
+// dynamic relocations. This does not affect the public C symbols which are
+// controlled independently via `LLVM_LIBC_FUNCTION_ATTR`.
+#define LIBC_NAMESPACE_DECL [[gnu::visibility("hidden")]] LIBC_NAMESPACE
+#else
+// TODO(#98548): GCC emits a warning when using the visibility attribute which
+// needs to be diagnosed and addressed.
+#define LIBC_NAMESPACE_DECL LIBC_NAMESPACE
+#endif
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MACROS_CONFIG_H
diff --git a/contrib/llvm-project/libc/src/__support/macros/null_check.h b/contrib/llvm-project/libc/src/__support/macros/null_check.h
new file mode 100644
index 000000000000..abf65c56c404
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/macros/null_check.h
@@ -0,0 +1,37 @@
+//===-- Safe nullptr check --------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MACROS_NULL_CHECK_H
+#define LLVM_LIBC_SRC___SUPPORT_MACROS_NULL_CHECK_H
+
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h"
+#include "src/__support/macros/sanitizer.h"
+
+#if defined(LIBC_ADD_NULL_CHECKS) && !defined(LIBC_HAS_SANITIZER)
+#define LIBC_CRASH_ON_NULLPTR(ptr)                                             \
+  do {                                                                         \
+    if (LIBC_UNLIKELY((ptr) == nullptr))                                       \
+      __builtin_trap();                                                        \
+  } while (0)
+#define LIBC_CRASH_ON_VALUE(var, value)                                        \
+  do {                                                                         \
+    if (LIBC_UNLIKELY((var) == (value)))                                       \
+      __builtin_trap();                                                        \
+  } while (0)
+
+#else
+#define LIBC_CRASH_ON_NULLPTR(ptr)                                             \
+  do {                                                                         \
+  } while (0)
+#define LIBC_CRASH_ON_VALUE(var, value)                                        \
+  do {                                                                         \
+  } while (0)
+#endif
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MACROS_NULL_CHECK_H
diff --git a/contrib/llvm-project/libc/src/__support/macros/optimization.h b/contrib/llvm-project/libc/src/__support/macros/optimization.h
new file mode 100644
index 000000000000..250a9e060728
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/macros/optimization.h
@@ -0,0 +1,76 @@
+//===-- Portable optimization macros ----------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// This header file defines portable macros for performance optimization.
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MACROS_OPTIMIZATION_H
+#define LLVM_LIBC_SRC___SUPPORT_MACROS_OPTIMIZATION_H
+
+#include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/compiler.h" // LIBC_COMPILER_IS_CLANG
+
+// We use a template to implement likely/unlikely to make sure that we don't
+// accidentally pass an integer.
+namespace LIBC_NAMESPACE_DECL {
+namespace details {
+template <typename T>
+LIBC_INLINE constexpr bool expects_bool_condition(T value, T expected) {
+  return __builtin_expect(value, expected);
+}
+} // namespace details
+} // namespace LIBC_NAMESPACE_DECL
+#define LIBC_LIKELY(x) LIBC_NAMESPACE::details::expects_bool_condition(x, true)
+#define LIBC_UNLIKELY(x)                                                       \
+  LIBC_NAMESPACE::details::expects_bool_condition(x, false)
+
+#if defined(LIBC_COMPILER_IS_CLANG)
+#define LIBC_LOOP_NOUNROLL _Pragma("nounroll")
+#define LIBC_LOOP_UNROLL _Pragma("unroll")
+#elif defined(LIBC_COMPILER_IS_GCC)
+#define LIBC_LOOP_NOUNROLL _Pragma("GCC unroll 0")
+#define LIBC_LOOP_UNROLL _Pragma("GCC unroll 2048")
+#else
+#error "Unhandled compiler"
+#endif
+
+// Defining optimization options for math functions.
+// TODO: Exporting this to public generated headers?
+#define LIBC_MATH_SKIP_ACCURATE_PASS 0x01
+#define LIBC_MATH_SMALL_TABLES 0x02
+#define LIBC_MATH_NO_ERRNO 0x04
+#define LIBC_MATH_NO_EXCEPT 0x08
+#define LIBC_MATH_FAST                                                         \
+  (LIBC_MATH_SKIP_ACCURATE_PASS | LIBC_MATH_SMALL_TABLES |                     \
+   LIBC_MATH_NO_ERRNO | LIBC_MATH_NO_EXCEPT)
+#define LIBC_MATH_INTERMEDIATE_COMP_IN_FLOAT 0x10
+
+#ifndef LIBC_MATH
+#define LIBC_MATH 0
+#endif // LIBC_MATH
+
+#if (LIBC_MATH & LIBC_MATH_SKIP_ACCURATE_PASS)
+#define LIBC_MATH_HAS_SKIP_ACCURATE_PASS
+#endif
+
+#if (LIBC_MATH & LIBC_MATH_SMALL_TABLES)
+#define LIBC_MATH_HAS_SMALL_TABLES
+#endif
+
+#if (LIBC_MATH & LIBC_MATH_INTERMEDIATE_COMP_IN_FLOAT)
+#define LIBC_MATH_HAS_INTERMEDIATE_COMP_IN_FLOAT
+#endif
+
+#if (LIBC_MATH & LIBC_MATH_NO_ERRNO)
+#define LIBC_MATH_HAS_NO_ERRNO
+#endif
+
+#if (LIBC_MATH & LIBC_MATH_NO_EXCEPT)
+#define LIBC_MATH_HAS_NO_EXCEPT
+#endif
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MACROS_OPTIMIZATION_H
diff --git a/contrib/llvm-project/libc/src/__support/macros/properties/README.md b/contrib/llvm-project/libc/src/__support/macros/properties/README.md
new file mode 100644
index 000000000000..05dc0ce3b929
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/macros/properties/README.md
@@ -0,0 +1,2 @@
+This folder contain freestanding header only files that describe constant
+target properties like architecture, supported cpu features, or used compiler.
diff --git a/contrib/llvm-project/libc/src/__support/macros/properties/architectures.h b/contrib/llvm-project/libc/src/__support/macros/properties/architectures.h
new file mode 100644
index 000000000000..c88956ff4114
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/macros/properties/architectures.h
@@ -0,0 +1,64 @@
+//===-- Compile time architecture detection ---------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MACROS_PROPERTIES_ARCHITECTURES_H
+#define LLVM_LIBC_SRC___SUPPORT_MACROS_PROPERTIES_ARCHITECTURES_H
+
+#if defined(__AMDGPU__)
+#define LIBC_TARGET_ARCH_IS_AMDGPU
+#endif
+
+#if defined(__NVPTX__)
+#define LIBC_TARGET_ARCH_IS_NVPTX
+#endif
+
+#if defined(LIBC_TARGET_ARCH_IS_NVPTX) || defined(LIBC_TARGET_ARCH_IS_AMDGPU)
+#define LIBC_TARGET_ARCH_IS_GPU
+#endif
+
+#if defined(__pnacl__) || defined(__CLR_VER) || defined(LIBC_TARGET_ARCH_IS_GPU)
+#define LIBC_TARGET_ARCH_IS_VM
+#endif
+
+#if (defined(_M_IX86) || defined(__i386__)) && !defined(LIBC_TARGET_ARCH_IS_VM)
+#define LIBC_TARGET_ARCH_IS_X86_32
+#endif
+
+#if (defined(_M_X64) || defined(__x86_64__)) && !defined(LIBC_TARGET_ARCH_IS_VM)
+#define LIBC_TARGET_ARCH_IS_X86_64
+#endif
+
+#if defined(LIBC_TARGET_ARCH_IS_X86_32) || defined(LIBC_TARGET_ARCH_IS_X86_64)
+#define LIBC_TARGET_ARCH_IS_X86
+#endif
+
+#if (defined(__arm__) || defined(_M_ARM))
+#define LIBC_TARGET_ARCH_IS_ARM
+#endif
+
+#if defined(__aarch64__) || defined(__arm64__) || defined(_M_ARM64)
+#define LIBC_TARGET_ARCH_IS_AARCH64
+#endif
+
+#if defined(LIBC_TARGET_ARCH_IS_AARCH64) || defined(LIBC_TARGET_ARCH_IS_ARM)
+#define LIBC_TARGET_ARCH_IS_ANY_ARM
+#endif
+
+#if defined(__riscv) && (__riscv_xlen == 64)
+#define LIBC_TARGET_ARCH_IS_RISCV64
+#endif
+
+#if defined(__riscv) && (__riscv_xlen == 32)
+#define LIBC_TARGET_ARCH_IS_RISCV32
+#endif
+
+#if defined(LIBC_TARGET_ARCH_IS_RISCV64) || defined(LIBC_TARGET_ARCH_IS_RISCV32)
+#define LIBC_TARGET_ARCH_IS_ANY_RISCV
+#endif
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MACROS_PROPERTIES_ARCHITECTURES_H
diff --git a/contrib/llvm-project/libc/src/__support/macros/properties/compiler.h b/contrib/llvm-project/libc/src/__support/macros/properties/compiler.h
new file mode 100644
index 000000000000..b9ec0dd1defb
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/macros/properties/compiler.h
@@ -0,0 +1,43 @@
+//===-- Compile time compiler detection -------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MACROS_PROPERTIES_COMPILER_H
+#define LLVM_LIBC_SRC___SUPPORT_MACROS_PROPERTIES_COMPILER_H
+
+// Example usage of compiler version checks
+// #if defined(LIBC_COMPILER_CLANG_VER)
+// #  if LIBC_COMPILER_CLANG_VER < 1500
+// #    warning "Libc only supports Clang 15 and later"
+// #  endif
+// #elif defined(LIBC_COMPILER_GCC_VER)
+// #  if LIBC_COMPILER_GCC_VER < 1500
+// #    warning "Libc only supports GCC 15 and later"
+// #  endif
+// #elif defined(LIBC_COMPILER_MSC_VER)
+// #  if LIBC_COMPILER_MSC_VER < 1930
+// #    warning "Libc only supports Visual Studio 2022 RTW (17.0) and later"
+// #  endif
+// #endif
+
+#if defined(__clang__)
+#define LIBC_COMPILER_IS_CLANG
+#define LIBC_COMPILER_CLANG_VER (__clang_major__ * 100 + __clang_minor__)
+#endif
+
+#if defined(__GNUC__) && !defined(__clang__)
+#define LIBC_COMPILER_IS_GCC
+#define LIBC_COMPILER_GCC_VER (__GNUC__ * 100 + __GNUC_MINOR__)
+#endif
+
+#if defined(_MSC_VER)
+#define LIBC_COMPILER_IS_MSC
+// https://learn.microsoft.com/en-us/cpp/preprocessor/predefined-macros
+#define LIBC_COMPILER_MSC_VER (_MSC_VER)
+#endif
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MACROS_PROPERTIES_COMPILER_H
diff --git a/contrib/llvm-project/libc/src/__support/macros/properties/complex_types.h b/contrib/llvm-project/libc/src/__support/macros/properties/complex_types.h
new file mode 100644
index 000000000000..ede4d6b7c7d9
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/macros/properties/complex_types.h
@@ -0,0 +1,30 @@
+//===-- Complex Types support -----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Complex Types detection and support.
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MACROS_PROPERTIES_CTYPES_H
+#define LLVM_LIBC_SRC___SUPPORT_MACROS_PROPERTIES_CTYPES_H
+
+#include "include/llvm-libc-types/cfloat128.h"
+#include "include/llvm-libc-types/cfloat16.h"
+#include "types.h"
+
+// -- cfloat16 support --------------------------------------------------------
+// LIBC_TYPES_HAS_CFLOAT16 and 'cfloat16' type is provided by
+// "include/llvm-libc-types/cfloat16.h"
+
+// -- cfloat128 support -------------------------------------------------------
+// LIBC_TYPES_HAS_CFLOAT128 and 'cfloat128' type are provided by
+// "include/llvm-libc-types/cfloat128.h"
+
+#if defined(LIBC_TYPES_HAS_CFLOAT128) &&                                       \
+    !defined(LIBC_TYPES_CFLOAT128_IS_COMPLEX_LONG_DOUBLE)
+#define LIBC_TYPES_CFLOAT128_IS_NOT_COMPLEX_LONG_DOUBLE
+#endif
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MACROS_PROPERTIES_CTYPES_H
diff --git a/contrib/llvm-project/libc/src/__support/macros/properties/cpu_features.h b/contrib/llvm-project/libc/src/__support/macros/properties/cpu_features.h
new file mode 100644
index 000000000000..cdb2df97b2b9
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/macros/properties/cpu_features.h
@@ -0,0 +1,108 @@
+//===-- Compile time cpu feature detection ----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// This file lists target cpu features by introspecting compiler enabled
+// preprocessor definitions.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MACROS_PROPERTIES_CPU_FEATURES_H
+#define LLVM_LIBC_SRC___SUPPORT_MACROS_PROPERTIES_CPU_FEATURES_H
+
+#include "architectures.h"
+
+#if defined(__ARM_FEATURE_FP16_SCALAR_ARITHMETIC)
+#define LIBC_TARGET_CPU_HAS_FULLFP16
+#endif
+
+#if defined(__SSE2__)
+#define LIBC_TARGET_CPU_HAS_SSE2
+#define LIBC_TARGET_CPU_HAS_FPU_FLOAT
+#define LIBC_TARGET_CPU_HAS_FPU_DOUBLE
+#endif
+
+#if defined(__SSE4_2__)
+#define LIBC_TARGET_CPU_HAS_SSE4_2
+#endif
+
+#if defined(__AVX__)
+#define LIBC_TARGET_CPU_HAS_AVX
+#endif
+
+#if defined(__AVX2__)
+#define LIBC_TARGET_CPU_HAS_AVX2
+#endif
+
+#if defined(__AVX512F__)
+#define LIBC_TARGET_CPU_HAS_AVX512F
+#endif
+
+#if defined(__AVX512BW__)
+#define LIBC_TARGET_CPU_HAS_AVX512BW
+#endif
+
+#if defined(__ARM_FP)
+#if (__ARM_FP & 0x2)
+#define LIBC_TARGET_CPU_HAS_ARM_FPU_HALF
+#define LIBC_TARGET_CPU_HAS_FPU_HALF
+#endif // LIBC_TARGET_CPU_HAS_ARM_FPU_HALF
+#if (__ARM_FP & 0x4)
+#define LIBC_TARGET_CPU_HAS_ARM_FPU_FLOAT
+#define LIBC_TARGET_CPU_HAS_FPU_FLOAT
+#endif // LIBC_TARGET_CPU_HAS_ARM_FPU_FLOAT
+#if (__ARM_FP & 0x8)
+#define LIBC_TARGET_CPU_HAS_ARM_FPU_DOUBLE
+#define LIBC_TARGET_CPU_HAS_FPU_DOUBLE
+#endif // LIBC_TARGET_CPU_HAS_ARM_FPU_DOUBLE
+#endif // __ARM_FP
+
+#if defined(__riscv_flen)
+// https://github.com/riscv-non-isa/riscv-c-api-doc/blob/main/src/c-api.adoc
+#if defined(__riscv_zfhmin)
+#define LIBC_TARGET_CPU_HAS_RISCV_FPU_HALF
+#define LIBC_TARGET_CPU_HAS_FPU_HALF
+#endif // LIBC_TARGET_CPU_HAS_RISCV_FPU_HALF
+#if (__riscv_flen >= 32)
+#define LIBC_TARGET_CPU_HAS_RISCV_FPU_FLOAT
+#define LIBC_TARGET_CPU_HAS_FPU_FLOAT
+#endif // LIBC_TARGET_CPU_HAS_RISCV_FPU_FLOAT
+#if (__riscv_flen >= 64)
+#define LIBC_TARGET_CPU_HAS_RISCV_FPU_DOUBLE
+#define LIBC_TARGET_CPU_HAS_FPU_DOUBLE
+#endif // LIBC_TARGET_CPU_HAS_RISCV_FPU_DOUBLE
+#endif // __riscv_flen
+
+#if defined(__NVPTX__) || defined(__AMDGPU__)
+#define LIBC_TARGET_CPU_HAS_FPU_FLOAT
+#define LIBC_TARGET_CPU_HAS_FPU_DOUBLE
+#endif
+
+#if defined(__ARM_FEATURE_FMA) || (defined(__AVX2__) && defined(__FMA__)) ||   \
+    defined(__NVPTX__) || defined(__AMDGPU__) || defined(__LIBC_RISCV_USE_FMA)
+#define LIBC_TARGET_CPU_HAS_FMA
+// Provide a more fine-grained control of FMA instruction for ARM targets.
+#if defined(LIBC_TARGET_CPU_HAS_FPU_HALF)
+#define LIBC_TARGET_CPU_HAS_FMA_HALF
+#endif // LIBC_TARGET_CPU_HAS_FMA_HALF
+#if defined(LIBC_TARGET_CPU_HAS_FPU_FLOAT)
+#define LIBC_TARGET_CPU_HAS_FMA_FLOAT
+#endif // LIBC_TARGET_CPU_HAS_FMA_FLOAT
+#if defined(LIBC_TARGET_CPU_HAS_FPU_DOUBLE)
+#define LIBC_TARGET_CPU_HAS_FMA_DOUBLE
+#endif // LIBC_TARGET_CPU_HAS_FMA_DOUBLE
+#endif
+
+#if defined(LIBC_TARGET_ARCH_IS_AARCH64) ||                                    \
+    (defined(LIBC_TARGET_ARCH_IS_X86_64) &&                                    \
+     defined(LIBC_TARGET_CPU_HAS_SSE4_2))
+#define LIBC_TARGET_CPU_HAS_NEAREST_INT
+#endif
+
+#if defined(LIBC_TARGET_ARCH_IS_AARCH64) || defined(LIBC_TARGET_ARCH_IS_GPU)
+#define LIBC_TARGET_CPU_HAS_FAST_FLOAT16_OPS
+#endif
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MACROS_PROPERTIES_CPU_FEATURES_H
diff --git a/contrib/llvm-project/libc/src/__support/macros/properties/os.h b/contrib/llvm-project/libc/src/__support/macros/properties/os.h
new file mode 100644
index 000000000000..807ce1812735
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/macros/properties/os.h
@@ -0,0 +1,32 @@
+//===-- Target OS detection -------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_SRC___SUPPORT_MACROS_PROPERTIES_OS_H
+#define LLVM_LIBC_SRC___SUPPORT_MACROS_PROPERTIES_OS_H
+
+#if (defined(__freebsd__) || defined(__FreeBSD__))
+#define LIBC_TARGET_OS_IS_FREEBSD
+#endif
+
+#if defined(__ANDROID__)
+#define LIBC_TARGET_OS_IS_ANDROID
+#endif
+
+#if defined(__linux__) && !defined(LIBC_TARGET_OS_IS_FREEBSD) &&               \
+    !defined(LIBC_TARGET_OS_IS_ANDROID)
+#define LIBC_TARGET_OS_IS_LINUX
+#endif
+
+#if (defined(_WIN64) || defined(_WIN32))
+#define LIBC_TARGET_OS_IS_WINDOWS
+#endif
+
+#if defined(__Fuchsia__)
+#define LIBC_TARGET_OS_IS_FUCHSIA
+#endif
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MACROS_PROPERTIES_OS_H
diff --git a/contrib/llvm-project/libc/src/__support/macros/properties/types.h b/contrib/llvm-project/libc/src/__support/macros/properties/types.h
new file mode 100644
index 000000000000..aec4a488c3cb
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/macros/properties/types.h
@@ -0,0 +1,72 @@
+//===-- Types support -------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Types detection and support.
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MACROS_PROPERTIES_TYPES_H
+#define LLVM_LIBC_SRC___SUPPORT_MACROS_PROPERTIES_TYPES_H
+
+#include "hdr/float_macros.h"                        // LDBL_MANT_DIG
+#include "include/llvm-libc-macros/float16-macros.h" // LIBC_TYPES_HAS_FLOAT16
+#include "include/llvm-libc-types/float128.h"        // float128
+#include "src/__support/macros/config.h"             // LIBC_NAMESPACE_DECL
+#include "src/__support/macros/properties/architectures.h"
+#include "src/__support/macros/properties/compiler.h"
+#include "src/__support/macros/properties/cpu_features.h"
+#include "src/__support/macros/properties/os.h"
+
+#include <stdint.h> // UINT64_MAX, __SIZEOF_INT128__
+
+// 'long double' properties.
+#if (LDBL_MANT_DIG == 53)
+#define LIBC_TYPES_LONG_DOUBLE_IS_FLOAT64
+#elif (LDBL_MANT_DIG == 64)
+#define LIBC_TYPES_LONG_DOUBLE_IS_X86_FLOAT80
+#elif (LDBL_MANT_DIG == 113)
+#define LIBC_TYPES_LONG_DOUBLE_IS_FLOAT128
+#elif (LDBL_MANT_DIG == 106)
+#define LIBC_TYPES_LONG_DOUBLE_IS_DOUBLE_DOUBLE
+#endif
+
+#if defined(LIBC_TYPES_HAS_FLOAT128) &&                                        \
+    !defined(LIBC_TYPES_LONG_DOUBLE_IS_FLOAT128)
+#define LIBC_TYPES_FLOAT128_IS_NOT_LONG_DOUBLE
+#endif
+
+// int64 / uint64 support
+#if defined(UINT64_MAX)
+#define LIBC_TYPES_HAS_INT64
+#endif // UINT64_MAX
+
+// int128 / uint128 support
+#if defined(__SIZEOF_INT128__) && !defined(LIBC_TARGET_OS_IS_WINDOWS)
+#define LIBC_TYPES_HAS_INT128
+#endif // defined(__SIZEOF_INT128__)
+
+// -- float16 support ---------------------------------------------------------
+// LIBC_TYPES_HAS_FLOAT16 is provided by
+// "include/llvm-libc-macros/float16-macros.h"
+#ifdef LIBC_TYPES_HAS_FLOAT16
+// Type alias for internal use.
+using float16 = _Float16;
+#endif // LIBC_TYPES_HAS_FLOAT16
+
+// -- float128 support --------------------------------------------------------
+// LIBC_TYPES_HAS_FLOAT128 and 'float128' type are provided by
+// "include/llvm-libc-types/float128.h"
+
+// -- bfloat16 support ---------------------------------------------------------
+
+namespace LIBC_NAMESPACE_DECL {
+namespace fputil {
+struct BFloat16;
+}
+} // namespace LIBC_NAMESPACE_DECL
+
+using bfloat16 = LIBC_NAMESPACE::fputil::BFloat16;
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MACROS_PROPERTIES_TYPES_H
diff --git a/contrib/llvm-project/libc/src/__support/macros/sanitizer.h b/contrib/llvm-project/libc/src/__support/macros/sanitizer.h
new file mode 100644
index 000000000000..c20412e0f8b6
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/macros/sanitizer.h
@@ -0,0 +1,59 @@
+//===-- Convenient sanitizer macros -----------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MACROS_SANITIZER_H
+#define LLVM_LIBC_SRC___SUPPORT_MACROS_SANITIZER_H
+
+#include "src/__support/macros/config.h" //LIBC_HAS_FEATURE
+
+//-----------------------------------------------------------------------------
+// Functions to unpoison memory
+//-----------------------------------------------------------------------------
+
+#if LIBC_HAS_FEATURE(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
+#define LIBC_HAS_ADDRESS_SANITIZER
+#endif
+
+#if LIBC_HAS_FEATURE(memory_sanitizer)
+#define LIBC_HAS_MEMORY_SANITIZER
+#endif
+
+#if LIBC_HAS_FEATURE(undefined_behavior_sanitizer)
+#define LIBC_HAS_UNDEFINED_BEHAVIOR_SANITIZER
+#endif
+
+#if defined(LIBC_HAS_ADDRESS_SANITIZER) ||                                     \
+    defined(LIBC_HAS_MEMORY_SANITIZER) ||                                      \
+    defined(LIBC_HAS_UNDEFINED_BEHAVIOR_SANITIZER)
+#define LIBC_HAS_SANITIZER
+#endif
+
+#ifdef LIBC_HAS_MEMORY_SANITIZER
+// Only perform MSAN unpoison in non-constexpr context.
+#include <sanitizer/msan_interface.h>
+#define MSAN_UNPOISON(addr, size)                                              \
+  do {                                                                         \
+    if (!__builtin_is_constant_evaluated())                                    \
+      __msan_unpoison(addr, size);                                             \
+  } while (0)
+#else
+#define MSAN_UNPOISON(ptr, size)
+#endif
+
+#ifdef LIBC_HAS_ADDRESS_SANITIZER
+#include <sanitizer/asan_interface.h>
+#define ASAN_POISON_MEMORY_REGION(addr, size)                                  \
+  __asan_poison_memory_region((addr), (size))
+#define ASAN_UNPOISON_MEMORY_REGION(addr, size)                                \
+  __asan_unpoison_memory_region((addr), (size))
+#else
+#define ASAN_POISON_MEMORY_REGION(addr, size) ((void)(addr), (void)(size))
+#define ASAN_UNPOISON_MEMORY_REGION(addr, size) ((void)(addr), (void)(size))
+#endif
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MACROS_SANITIZER_H
diff --git a/contrib/llvm-project/libc/src/__support/math/exp_float_constants.h b/contrib/llvm-project/libc/src/__support/math/exp_float_constants.h
new file mode 100644
index 000000000000..cabb227a034b
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/math/exp_float_constants.h
@@ -0,0 +1,145 @@
+//===-- Look-up tables for exp*f functions ----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MATH_EXP_FLOAT_CONSTANTS_H
+#define LLVM_LIBC_SRC___SUPPORT_MATH_EXP_FLOAT_CONSTANTS_H
+
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace math {
+// Lookup table for exp(m) with m = -104, ..., 89.
+//   -104 = floor(log(single precision's min denormal))
+//     89 = ceil(log(single precision's max normal))
+// Table is generated with Sollya as follow:
+// > display = hexadecimal;
+// > for i from -104 to 89 do { D(exp(i)); };
+static constexpr double EXP_M1[195] = {
+    0x1.f1e6b68529e33p-151, 0x1.525be4e4e601dp-149, 0x1.cbe0a45f75eb1p-148,
+    0x1.3884e838aea68p-146, 0x1.a8c1f14e2af5dp-145, 0x1.20a717e64a9bdp-143,
+    0x1.8851d84118908p-142, 0x1.0a9bdfb02d240p-140, 0x1.6a5bea046b42ep-139,
+    0x1.ec7f3b269efa8p-138, 0x1.4eafb87eab0f2p-136, 0x1.c6e2d05bbc000p-135,
+    0x1.35208867c2683p-133, 0x1.a425b317eeacdp-132, 0x1.1d8508fa8246ap-130,
+    0x1.840fbc08fdc8ap-129, 0x1.07b7112bc1ffep-127, 0x1.666d0dad2961dp-126,
+    0x1.e726c3f64d0fep-125, 0x1.4b0dc07cabf98p-123, 0x1.c1f2daf3b6a46p-122,
+    0x1.31c5957a47de2p-120, 0x1.9f96445648b9fp-119, 0x1.1a6baeadb4fd1p-117,
+    0x1.7fd974d372e45p-116, 0x1.04da4d1452919p-114, 0x1.62891f06b3450p-113,
+    0x1.e1dd273aa8a4ap-112, 0x1.4775e0840bfddp-110, 0x1.bd109d9d94bdap-109,
+    0x1.2e73f53fba844p-107, 0x1.9b138170d6bfep-106, 0x1.175af0cf60ec5p-104,
+    0x1.7baee1bffa80bp-103, 0x1.02057d1245cebp-101, 0x1.5eafffb34ba31p-100,
+    0x1.dca23bae16424p-99,  0x1.43e7fc88b8056p-97,  0x1.b83bf23a9a9ebp-96,
+    0x1.2b2b8dd05b318p-94,  0x1.969d47321e4ccp-93,  0x1.1452b7723aed2p-91,
+    0x1.778fe2497184cp-90,  0x1.fe7116182e9ccp-89,  0x1.5ae191a99585ap-87,
+    0x1.d775d87da854dp-86,  0x1.4063f8cc8bb98p-84,  0x1.b374b315f87c1p-83,
+    0x1.27ec458c65e3cp-81,  0x1.923372c67a074p-80,  0x1.1152eaeb73c08p-78,
+    0x1.737c5645114b5p-77,  0x1.f8e6c24b5592ep-76,  0x1.571db733a9d61p-74,
+    0x1.d257d547e083fp-73,  0x1.3ce9b9de78f85p-71,  0x1.aebabae3a41b5p-70,
+    0x1.24b6031b49bdap-68,  0x1.8dd5e1bb09d7ep-67,  0x1.0e5b73d1ff53dp-65,
+    0x1.6f741de1748ecp-64,  0x1.f36bd37f42f3ep-63,  0x1.536452ee2f75cp-61,
+    0x1.cd480a1b74820p-60,  0x1.39792499b1a24p-58,  0x1.aa0de4bf35b38p-57,
+    0x1.2188ad6ae3303p-55,  0x1.898471fca6055p-54,  0x1.0b6c3afdde064p-52,
+    0x1.6b7719a59f0e0p-51,  0x1.ee001eed62aa0p-50,  0x1.4fb547c775da8p-48,
+    0x1.c8464f7616468p-47,  0x1.36121e24d3bbap-45,  0x1.a56e0c2ac7f75p-44,
+    0x1.1e642baeb84a0p-42,  0x1.853f01d6d53bap-41,  0x1.0885298767e9ap-39,
+    0x1.67852a7007e42p-38,  0x1.e8a37a45fc32ep-37,  0x1.4c1078fe9228ap-35,
+    0x1.c3527e433fab1p-34,  0x1.32b48bf117da2p-32,  0x1.a0db0d0ddb3ecp-31,
+    0x1.1b48655f37267p-29,  0x1.81056ff2c5772p-28,  0x1.05a628c699fa1p-26,
+    0x1.639e3175a689dp-25,  0x1.e355bbaee85cbp-24,  0x1.4875ca227ec38p-22,
+    0x1.be6c6fdb01612p-21,  0x1.2f6053b981d98p-19,  0x1.9c54c3b43bc8bp-18,
+    0x1.18354238f6764p-16,  0x1.7cd79b5647c9bp-15,  0x1.02cf22526545ap-13,
+    0x1.5fc21041027adp-12,  0x1.de16b9c24a98fp-11,  0x1.44e51f113d4d6p-9,
+    0x1.b993fe00d5376p-8,   0x1.2c155b8213cf4p-6,   0x1.97db0ccceb0afp-5,
+    0x1.152aaa3bf81ccp-3,   0x1.78b56362cef38p-2,   0x1.0000000000000p+0,
+    0x1.5bf0a8b145769p+1,   0x1.d8e64b8d4ddaep+2,   0x1.415e5bf6fb106p+4,
+    0x1.b4c902e273a58p+5,   0x1.28d389970338fp+7,   0x1.936dc5690c08fp+8,
+    0x1.122885aaeddaap+10,  0x1.749ea7d470c6ep+11,  0x1.fa7157c470f82p+12,
+    0x1.5829dcf950560p+14,  0x1.d3c4488ee4f7fp+15,  0x1.3de1654d37c9ap+17,
+    0x1.b00b5916ac955p+18,  0x1.259ac48bf05d7p+20,  0x1.8f0ccafad2a87p+21,
+    0x1.0f2ebd0a80020p+23,  0x1.709348c0ea4f9p+24,  0x1.f4f22091940bdp+25,
+    0x1.546d8f9ed26e1p+27,  0x1.ceb088b68e804p+28,  0x1.3a6e1fd9eecfdp+30,
+    0x1.ab5adb9c43600p+31,  0x1.226af33b1fdc1p+33,  0x1.8ab7fb5475fb7p+34,
+    0x1.0c3d3920962c9p+36,  0x1.6c932696a6b5dp+37,  0x1.ef822f7f6731dp+38,
+    0x1.50bba3796379ap+40,  0x1.c9aae4631c056p+41,  0x1.370470aec28edp+43,
+    0x1.a6b765d8cdf6dp+44,  0x1.1f43fcc4b662cp+46,  0x1.866f34a725782p+47,
+    0x1.0953e2f3a1ef7p+49,  0x1.689e221bc8d5bp+50,  0x1.ea215a1d20d76p+51,
+    0x1.4d13fbb1a001ap+53,  0x1.c4b334617cc67p+54,  0x1.33a43d282a519p+56,
+    0x1.a220d397972ebp+57,  0x1.1c25c88df6862p+59,  0x1.8232558201159p+60,
+    0x1.0672a3c9eb871p+62,  0x1.64b41c6d37832p+63,  0x1.e4cf766fe49bep+64,
+    0x1.49767bc0483e3p+66,  0x1.bfc951eb8bb76p+67,  0x1.304d6aeca254bp+69,
+    0x1.9d97010884251p+70,  0x1.19103e4080b45p+72,  0x1.7e013cd114461p+73,
+    0x1.03996528e074cp+75,  0x1.60d4f6fdac731p+76,  0x1.df8c5af17ba3bp+77,
+    0x1.45e3076d61699p+79,  0x1.baed16a6e0da7p+80,  0x1.2cffdfebde1a1p+82,
+    0x1.9919cabefcb69p+83,  0x1.160345c9953e3p+85,  0x1.79dbc9dc53c66p+86,
+    0x1.00c810d464097p+88,  0x1.5d009394c5c27p+89,  0x1.da57de8f107a8p+90,
+    0x1.425982cf597cdp+92,  0x1.b61e5ca3a5e31p+93,  0x1.29bb825dfcf87p+95,
+    0x1.94a90db0d6fe2p+96,  0x1.12fec759586fdp+98,  0x1.75c1dc469e3afp+99,
+    0x1.fbfd219c43b04p+100, 0x1.5936d44e1a146p+102, 0x1.d531d8a7ee79cp+103,
+    0x1.3ed9d24a2d51bp+105, 0x1.b15cfe5b6e17bp+106, 0x1.268038c2c0e00p+108,
+    0x1.9044a73545d48p+109, 0x1.1002ab6218b38p+111, 0x1.71b3540cbf921p+112,
+    0x1.f6799ea9c414ap+113, 0x1.55779b984f3ebp+115, 0x1.d01a210c44aa4p+116,
+    0x1.3b63da8e91210p+118, 0x1.aca8d6b0116b8p+119, 0x1.234de9e0c74e9p+121,
+    0x1.8bec7503ca477p+122, 0x1.0d0eda9796b90p+124, 0x1.6db0118477245p+125,
+    0x1.f1056dc7bf22dp+126, 0x1.51c2cc3433801p+128, 0x1.cb108ffbec164p+129,
+};
+
+// Lookup table for exp(m * 2^(-7)) with m = 0, ..., 127.
+// Table is generated with Sollya as follow:
+// > display = hexadecimal;
+// > for i from 0 to 127 do { D(exp(i / 128)); };
+static constexpr double EXP_M2[128] = {
+    0x1.0000000000000p0, 0x1.0202015600446p0, 0x1.04080ab55de39p0,
+    0x1.06122436410ddp0, 0x1.08205601127edp0, 0x1.0a32a84e9c1f6p0,
+    0x1.0c49236829e8cp0, 0x1.0e63cfa7ab09dp0, 0x1.1082b577d34edp0,
+    0x1.12a5dd543ccc5p0, 0x1.14cd4fc989cd6p0, 0x1.16f9157587069p0,
+    0x1.192937074e0cdp0, 0x1.1b5dbd3f68122p0, 0x1.1d96b0eff0e79p0,
+    0x1.1fd41afcba45ep0, 0x1.2216045b6f5cdp0, 0x1.245c7613b8a9bp0,
+    0x1.26a7793f60164p0, 0x1.28f7170a755fdp0, 0x1.2b4b58b372c79p0,
+    0x1.2da4478b620c7p0, 0x1.3001ecf601af7p0, 0x1.32645269ea829p0,
+    0x1.34cb8170b5835p0, 0x1.373783a722012p0, 0x1.39a862bd3c106p0,
+    0x1.3c1e2876834aap0, 0x1.3e98deaa11dccp0, 0x1.41188f42c3e32p0,
+    0x1.439d443f5f159p0, 0x1.462707b2bac21p0, 0x1.48b5e3c3e8186p0,
+    0x1.4b49e2ae5ac67p0, 0x1.4de30ec211e60p0, 0x1.50817263c13cdp0,
+    0x1.5325180cfacf7p0, 0x1.55ce0a4c58c7cp0, 0x1.587c53c5a7af0p0,
+    0x1.5b2fff3210fd9p0, 0x1.5de9176045ff5p0, 0x1.60a7a734ab0e8p0,
+    0x1.636bb9a983258p0, 0x1.663559cf1bc7cp0, 0x1.690492cbf9433p0,
+    0x1.6bd96fdd034a2p0, 0x1.6eb3fc55b1e76p0, 0x1.719443a03acb9p0,
+    0x1.747a513dbef6ap0, 0x1.776630c678bc1p0, 0x1.7a57ede9ea23ep0,
+    0x1.7d4f946f0ba8dp0, 0x1.804d30347b546p0, 0x1.8350cd30ac390p0,
+    0x1.865a7772164c5p0, 0x1.896a3b1f66a0ep0, 0x1.8c802477b0010p0,
+    0x1.8f9c3fd29beafp0, 0x1.92be99a09bf00p0, 0x1.95e73e6b1b75ep0,
+    0x1.99163ad4b1dccp0, 0x1.9c4b9b995509bp0, 0x1.9f876d8e8c566p0,
+    0x1.a2c9bda3a3e78p0, 0x1.a61298e1e069cp0, 0x1.a9620c6cb3374p0,
+    0x1.acb82581eee54p0, 0x1.b014f179fc3b8p0, 0x1.b3787dc80f95fp0,
+    0x1.b6e2d7fa5eb18p0, 0x1.ba540dba56e56p0, 0x1.bdcc2cccd3c85p0,
+    0x1.c14b431256446p0, 0x1.c4d15e873c193p0, 0x1.c85e8d43f7cd0p0,
+    0x1.cbf2dd7d490f2p0, 0x1.cf8e5d84758a9p0, 0x1.d3311bc7822b4p0,
+    0x1.d6db26d16cd67p0, 0x1.da8c8d4a66969p0, 0x1.de455df80e3c0p0,
+    0x1.e205a7bdab73ep0, 0x1.e5cd799c6a54ep0, 0x1.e99ce2b397649p0,
+    0x1.ed73f240dc142p0, 0x1.f152b7a07bb76p0, 0x1.f539424d90f5ep0,
+    0x1.f927a1e24bb76p0, 0x1.fd1de6182f8c9p0, 0x1.008e0f64294abp1,
+    0x1.02912df5ce72ap1, 0x1.049856cd84339p1, 0x1.06a39207f0a09p1,
+    0x1.08b2e7d2035cfp1, 0x1.0ac6606916501p1, 0x1.0cde041b0e9aep1,
+    0x1.0ef9db467dcf8p1, 0x1.1119ee5ac36b6p1, 0x1.133e45d82e952p1,
+    0x1.1566ea50201d7p1, 0x1.1793e4652cc50p1, 0x1.19c53ccb3fc6bp1,
+    0x1.1bfafc47bda73p1, 0x1.1e352bb1a74adp1, 0x1.2073d3f1bd518p1,
+    0x1.22b6fe02a3b9cp1, 0x1.24feb2f105cb8p1, 0x1.274afbdbba4a6p1,
+    0x1.299be1f3e7f1cp1, 0x1.2bf16e7d2a38cp1, 0x1.2e4baacdb6614p1,
+    0x1.30aaa04e80d05p1, 0x1.330e587b62b28p1, 0x1.3576dce33feadp1,
+    0x1.37e437282d4eep1, 0x1.3a5670ff972edp1, 0x1.3ccd9432682b4p1,
+    0x1.3f49aa9d30590p1, 0x1.41cabe304cb34p1, 0x1.4450d8f00edd4p1,
+    0x1.46dc04f4e5338p1, 0x1.496c4c6b832dap1, 0x1.4c01b9950a111p1,
+    0x1.4e9c56c731f5dp1, 0x1.513c2e6c731d7p1, 0x1.53e14b042f9cap1,
+    0x1.568bb722dd593p1, 0x1.593b7d72305bbp1,
+};
+
+} // namespace math
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MATH_EXP_FLOAT_CONSTANTS_H
diff --git a/contrib/llvm-project/libc/src/__support/math/expf.h b/contrib/llvm-project/libc/src/__support/math/expf.h
new file mode 100644
index 000000000000..88c151492a04
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/math/expf.h
@@ -0,0 +1,116 @@
+//===-- Implementation header for expf --------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MATH_EXPF_H
+#define LLVM_LIBC_SRC___SUPPORT_MATH_EXPF_H
+
+#include "exp_float_constants.h" // Lookup tables EXP_M1 and EXP_M2.
+#include "src/__support/FPUtil/FEnvImpl.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/FPUtil/PolyEval.h"
+#include "src/__support/FPUtil/multiply_add.h"
+#include "src/__support/FPUtil/nearest_integer.h"
+#include "src/__support/FPUtil/rounding_mode.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace math {
+
+static constexpr float expf(float x) {
+  using FPBits = typename fputil::FPBits<float>;
+  FPBits xbits(x);
+
+  uint32_t x_u = xbits.uintval();
+  uint32_t x_abs = x_u & 0x7fff'ffffU;
+
+#ifndef LIBC_MATH_HAS_SKIP_ACCURATE_PASS
+  // Exceptional values
+  if (LIBC_UNLIKELY(x_u == 0xc236'bd8cU)) { // x = -0x1.6d7b18p+5f
+    return 0x1.108a58p-66f - x * 0x1.0p-95f;
+  }
+#endif // !LIBC_MATH_HAS_SKIP_ACCURATE_PASS
+
+  // When |x| >= 89, |x| < 2^-25, or x is nan
+  if (LIBC_UNLIKELY(x_abs >= 0x42b2'0000U || x_abs <= 0x3280'0000U)) {
+    // |x| < 2^-25
+    if (xbits.get_biased_exponent() <= 101) {
+      return 1.0f + x;
+    }
+
+    // When x < log(2^-150) or nan
+    if (xbits.uintval() >= 0xc2cf'f1b5U) {
+      // exp(-Inf) = 0
+      if (xbits.is_inf())
+        return 0.0f;
+      // exp(nan) = nan
+      if (xbits.is_nan())
+        return x;
+      if (fputil::fenv_is_round_up())
+        return FPBits::min_subnormal().get_val();
+      fputil::set_errno_if_required(ERANGE);
+      fputil::raise_except_if_required(FE_UNDERFLOW);
+      return 0.0f;
+    }
+    // x >= 89 or nan
+    if (xbits.is_pos() && (xbits.uintval() >= 0x42b2'0000)) {
+      // x is finite
+      if (xbits.uintval() < 0x7f80'0000U) {
+        int rounding = fputil::quick_get_round();
+        if (rounding == FE_DOWNWARD || rounding == FE_TOWARDZERO)
+          return FPBits::max_normal().get_val();
+
+        fputil::set_errno_if_required(ERANGE);
+        fputil::raise_except_if_required(FE_OVERFLOW);
+      }
+      // x is +inf or nan
+      return x + FPBits::inf().get_val();
+    }
+  }
+  // For -104 < x < 89, to compute exp(x), we perform the following range
+  // reduction: find hi, mid, lo such that:
+  //   x = hi + mid + lo, in which
+  //     hi is an integer,
+  //     mid * 2^7 is an integer
+  //     -2^(-8) <= lo < 2^-8.
+  // In particular,
+  //   hi + mid = round(x * 2^7) * 2^(-7).
+  // Then,
+  //   exp(x) = exp(hi + mid + lo) = exp(hi) * exp(mid) * exp(lo).
+  // We store exp(hi) and exp(mid) in the lookup tables EXP_M1 and EXP_M2
+  // respectively.  exp(lo) is computed using a degree-4 minimax polynomial
+  // generated by Sollya.
+
+  // x_hi = (hi + mid) * 2^7 = round(x * 2^7).
+  float kf = fputil::nearest_integer(x * 0x1.0p7f);
+  // Subtract (hi + mid) from x to get lo.
+  double xd = static_cast<double>(fputil::multiply_add(kf, -0x1.0p-7f, x));
+  int x_hi = static_cast<int>(kf);
+  x_hi += 104 << 7;
+  // hi = x_hi >> 7
+  double exp_hi = EXP_M1[x_hi >> 7];
+  // mid * 2^7 = x_hi & 0x0000'007fU;
+  double exp_mid = EXP_M2[x_hi & 0x7f];
+  // Degree-4 minimax polynomial generated by Sollya with the following
+  // commands:
+  //   > display = hexadecimal;
+  //   > Q = fpminimax(expm1(x)/x, 3, [|D...|], [-2^-8, 2^-8]);
+  //   > Q;
+  double exp_lo =
+      fputil::polyeval(xd, 0x1p0, 0x1.ffffffffff777p-1, 0x1.000000000071cp-1,
+                       0x1.555566668e5e7p-3, 0x1.55555555ef243p-5);
+  return static_cast<float>(exp_hi * exp_mid * exp_lo);
+}
+
+} // namespace math
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MATH_EXPF_H
diff --git a/contrib/llvm-project/libc/src/__support/math/expf16.h b/contrib/llvm-project/libc/src/__support/math/expf16.h
new file mode 100644
index 000000000000..ded28c7dba50
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/math/expf16.h
@@ -0,0 +1,141 @@
+//===-- Implementation header for expf16 ------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MATH_EXPF16_H
+#define LLVM_LIBC_SRC___SUPPORT_MATH_EXPF16_H
+
+#include "include/llvm-libc-macros/float16-macros.h"
+
+#ifdef LIBC_TYPES_HAS_FLOAT16
+
+#include "hdr/errno_macros.h"
+#include "hdr/fenv_macros.h"
+#include "src/__support/FPUtil/FEnvImpl.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/FPUtil/PolyEval.h"
+#include "src/__support/FPUtil/cast.h"
+#include "src/__support/FPUtil/except_value_utils.h"
+#include "src/__support/FPUtil/rounding_mode.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h"
+
+#include "expf16_utils.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace math {
+
+static constexpr float16 expf16(float16 x) {
+#ifndef LIBC_MATH_HAS_SKIP_ACCURATE_PASS
+  constexpr fputil::ExceptValues<float16, 2> EXPF16_EXCEPTS_LO = {{
+      // (input, RZ output, RU offset, RD offset, RN offset)
+      // x = 0x1.de4p-8, expf16(x) = 0x1.01cp+0 (RZ)
+      {0x1f79U, 0x3c07U, 1U, 0U, 0U},
+      // x = 0x1.73cp-6, expf16(x) = 0x1.05cp+0 (RZ)
+      {0x25cfU, 0x3c17U, 1U, 0U, 0U},
+  }};
+
+  constexpr fputil::ExceptValues<float16, 3> EXPF16_EXCEPTS_HI = {{
+      // (input, RZ output, RU offset, RD offset, RN offset)
+      // x = 0x1.c34p+0, expf16(x) = 0x1.74cp+2 (RZ)
+      {0x3f0dU, 0x45d3U, 1U, 0U, 1U},
+      // x = -0x1.488p-5, expf16(x) = 0x1.ebcp-1 (RZ)
+      {0xa922U, 0x3bafU, 1U, 0U, 0U},
+      // x = -0x1.55p-5, expf16(x) = 0x1.ebp-1 (RZ)
+      {0xa954U, 0x3bacU, 1U, 0U, 0U},
+  }};
+#endif // !LIBC_MATH_HAS_SKIP_ACCURATE_PASS
+
+  using FPBits = fputil::FPBits<float16>;
+  FPBits x_bits(x);
+
+  uint16_t x_u = x_bits.uintval();
+  uint16_t x_abs = x_u & 0x7fffU;
+
+  // When 0 < |x| <= 2^(-5), or |x| >= 12, or x is NaN.
+  if (LIBC_UNLIKELY(x_abs <= 0x2800U || x_abs >= 0x4a00U)) {
+    // exp(NaN) = NaN
+    if (x_bits.is_nan()) {
+      if (x_bits.is_signaling_nan()) {
+        fputil::raise_except_if_required(FE_INVALID);
+        return FPBits::quiet_nan().get_val();
+      }
+
+      return x;
+    }
+
+    // When x >= 12.
+    if (x_bits.is_pos() && x_abs >= 0x4a00U) {
+      // exp(+inf) = +inf
+      if (x_bits.is_inf())
+        return FPBits::inf().get_val();
+
+      switch (fputil::quick_get_round()) {
+      case FE_TONEAREST:
+      case FE_UPWARD:
+        fputil::set_errno_if_required(ERANGE);
+        fputil::raise_except_if_required(FE_OVERFLOW);
+        return FPBits::inf().get_val();
+      default:
+        return FPBits::max_normal().get_val();
+      }
+    }
+
+    // When x <= -18.
+    if (x_u >= 0xcc80U) {
+      // exp(-inf) = +0
+      if (x_bits.is_inf())
+        return FPBits::zero().get_val();
+
+      fputil::set_errno_if_required(ERANGE);
+      fputil::raise_except_if_required(FE_UNDERFLOW | FE_INEXACT);
+
+      switch (fputil::quick_get_round()) {
+      case FE_UPWARD:
+        return FPBits::min_subnormal().get_val();
+      default:
+        return FPBits::zero().get_val();
+      }
+    }
+
+    // When 0 < |x| <= 2^(-5).
+    if (x_abs <= 0x2800U && !x_bits.is_zero()) {
+#ifndef LIBC_MATH_HAS_SKIP_ACCURATE_PASS
+      if (auto r = EXPF16_EXCEPTS_LO.lookup(x_u); LIBC_UNLIKELY(r.has_value()))
+        return r.value();
+#endif // !LIBC_MATH_HAS_SKIP_ACCURATE_PASS
+
+      float xf = x;
+      // Degree-3 minimax polynomial generated by Sollya with the following
+      // commands:
+      //   > display = hexadecimal;
+      //   > P = fpminimax(expm1(x)/x, 2, [|SG...|], [-2^-5, 2^-5]);
+      //   > 1 + x * P;
+      return fputil::cast<float16>(
+          fputil::polyeval(xf, 0x1p+0f, 0x1p+0f, 0x1.0004p-1f, 0x1.555778p-3f));
+    }
+  }
+
+#ifndef LIBC_MATH_HAS_SKIP_ACCURATE_PASS
+  if (auto r = EXPF16_EXCEPTS_HI.lookup(x_u); LIBC_UNLIKELY(r.has_value()))
+    return r.value();
+#endif // !LIBC_MATH_HAS_SKIP_ACCURATE_PASS
+
+  // exp(x) = exp(hi + mid) * exp(lo)
+  auto [exp_hi_mid, exp_lo] = exp_range_reduction(x);
+  return fputil::cast<float16>(exp_hi_mid * exp_lo);
+}
+
+} // namespace math
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LIBC_TYPES_HAS_FLOAT16
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MATH_EXPF16_H
diff --git a/contrib/llvm-project/libc/src/__support/math/expf16_utils.h b/contrib/llvm-project/libc/src/__support/math/expf16_utils.h
new file mode 100644
index 000000000000..bebb72b09b88
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/math/expf16_utils.h
@@ -0,0 +1,89 @@
+//===-- Common utils for expf16 functions -----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MATH_EXPF16_UTILS_H
+#define LLVM_LIBC_SRC___SUPPORT_MATH_EXPF16_UTILS_H
+
+#include "include/llvm-libc-macros/float16-macros.h"
+
+#ifdef LIBC_TYPES_HAS_FLOAT16
+
+#include "src/__support/CPP/array.h"
+#include "src/__support/FPUtil/PolyEval.h"
+#include "src/__support/FPUtil/nearest_integer.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+// Generated by Sollya with the following commands:
+//   > display = hexadecimal;
+//   > for i from -18 to 12 do print(round(exp(i), SG, RN));
+static constexpr cpp::array<float, 31> EXP_HI = {
+    0x1.05a628p-26f, 0x1.639e32p-25f, 0x1.e355bcp-24f, 0x1.4875cap-22f,
+    0x1.be6c7p-21f,  0x1.2f6054p-19f, 0x1.9c54c4p-18f, 0x1.183542p-16f,
+    0x1.7cd79cp-15f, 0x1.02cf22p-13f, 0x1.5fc21p-12f,  0x1.de16bap-11f,
+    0x1.44e52p-9f,   0x1.b993fep-8f,  0x1.2c155cp-6f,  0x1.97db0cp-5f,
+    0x1.152aaap-3f,  0x1.78b564p-2f,  0x1p+0f,         0x1.5bf0a8p+1f,
+    0x1.d8e64cp+2f,  0x1.415e5cp+4f,  0x1.b4c902p+5f,  0x1.28d38ap+7f,
+    0x1.936dc6p+8f,  0x1.122886p+10f, 0x1.749ea8p+11f, 0x1.fa7158p+12f,
+    0x1.5829dcp+14f, 0x1.d3c448p+15f, 0x1.3de166p+17f,
+};
+
+// Generated by Sollya with the following commands:
+//   > display = hexadecimal;
+//   > for i from 0 to 7 do print(round(exp(i * 2^-3), SG, RN));
+static constexpr cpp::array<float, 8> EXP_MID = {
+    0x1p+0f,        0x1.221604p+0f, 0x1.48b5e4p+0f, 0x1.747a52p+0f,
+    0x1.a61298p+0f, 0x1.de455ep+0f, 0x1.0ef9dcp+1f, 0x1.330e58p+1f,
+};
+
+struct ExpRangeReduction {
+  float exp_hi_mid;
+  float exp_lo;
+};
+
+static constexpr ExpRangeReduction exp_range_reduction(float16 x) {
+  // For -18 < x < 12, to compute exp(x), we perform the following range
+  // reduction: find hi, mid, lo, such that:
+  //   x = hi + mid + lo, in which
+  //     hi is an integer,
+  //     mid * 2^3 is an integer,
+  //     -2^(-4) <= lo < 2^(-4).
+  // In particular,
+  //   hi + mid = round(x * 2^3) * 2^(-3).
+  // Then,
+  //   exp(x) = exp(hi + mid + lo) = exp(hi) * exp(mid) * exp(lo).
+  // We store exp(hi) and exp(mid) in the lookup tables EXP_HI and EXP_MID
+  // respectively.  exp(lo) is computed using a degree-3 minimax polynomial
+  // generated by Sollya.
+
+  float xf = x;
+  float kf = fputil::nearest_integer(xf * 0x1.0p+3f);
+  int x_hi_mid = static_cast<int>(kf);
+  int x_hi = x_hi_mid >> 3;
+  int x_mid = x_hi_mid & 0x7;
+  // lo = x - (hi + mid) = round(x * 2^3) * (-2^(-3)) + x
+  float lo = fputil::multiply_add(kf, -0x1.0p-3f, xf);
+
+  float exp_hi = EXP_HI[x_hi + 18];
+  float exp_mid = EXP_MID[x_mid];
+  // Degree-3 minimax polynomial generated by Sollya with the following
+  // commands:
+  //   > display = hexadecimal;
+  //   > P = fpminimax(expm1(x)/x, 2, [|SG...|], [-2^-4, 2^-4]);
+  //   > 1 + x * P;
+  float exp_lo =
+      fputil::polyeval(lo, 0x1p+0f, 0x1p+0f, 0x1.001p-1f, 0x1.555ddep-3f);
+  return {exp_hi * exp_mid, exp_lo};
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LIBC_TYPES_HAS_FLOAT16
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MATH_EXPF16_UTILS_H
diff --git a/contrib/llvm-project/libc/src/__support/math/frexpf.h b/contrib/llvm-project/libc/src/__support/math/frexpf.h
new file mode 100644
index 000000000000..4d2f4948f2af
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/math/frexpf.h
@@ -0,0 +1,28 @@
+//===-- Implementation header for frexpf ------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MATH_FREXPF_H
+#define LLVM_LIBC_SRC___SUPPORT_MATH_FREXPF_H
+
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace math {
+
+static constexpr float frexpf(float x, int *exp) {
+  return fputil::frexp(x, *exp);
+}
+
+} // namespace math
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MATH_FREXPF_H
diff --git a/contrib/llvm-project/libc/src/__support/math/frexpf128.h b/contrib/llvm-project/libc/src/__support/math/frexpf128.h
new file mode 100644
index 000000000000..2fd5bc4318e2
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/math/frexpf128.h
@@ -0,0 +1,34 @@
+//===-- Implementation header for expf --------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MATH_FREXPF128_H
+#define LLVM_LIBC_SRC___SUPPORT_MATH_FREXPF128_H
+
+#include "include/llvm-libc-types/float128.h"
+
+#ifdef LIBC_TYPES_HAS_FLOAT128
+
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace math {
+
+static constexpr float128 frexpf128(float128 x, int *exp) {
+  return fputil::frexp(x, *exp);
+}
+
+} // namespace math
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LIBC_TYPES_HAS_FLOAT128
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MATH_FREXPF128_H
diff --git a/contrib/llvm-project/libc/src/__support/math/frexpf16.h b/contrib/llvm-project/libc/src/__support/math/frexpf16.h
new file mode 100644
index 000000000000..8deeba0f43e3
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/math/frexpf16.h
@@ -0,0 +1,34 @@
+//===-- Implementation header for frexpf16 ----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MATH_FREXPF16_H
+#define LLVM_LIBC_SRC___SUPPORT_MATH_FREXPF16_H
+
+#include "include/llvm-libc-macros/float16-macros.h"
+
+#ifdef LIBC_TYPES_HAS_FLOAT16
+
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace math {
+
+static constexpr float16 frexpf16(float16 x, int *exp) {
+  return fputil::frexp(x, *exp);
+}
+
+} // namespace math
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LIBC_TYPES_HAS_FLOAT16
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MATH_FREXPF16_H
diff --git a/contrib/llvm-project/libc/src/__support/math/ldexpf.h b/contrib/llvm-project/libc/src/__support/math/ldexpf.h
new file mode 100644
index 000000000000..3a5ec1d47133
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/math/ldexpf.h
@@ -0,0 +1,28 @@
+//===-- Implementation header for ldexpf ------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MATH_LDEXPF_H
+#define LLVM_LIBC_SRC___SUPPORT_MATH_LDEXPF_H
+
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace math {
+
+static constexpr float ldexpf(float x, int exp) {
+  return fputil::ldexp(x, exp);
+}
+
+} // namespace math
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MATH_LDEXPF_H
diff --git a/contrib/llvm-project/libc/src/__support/math/ldexpf128.h b/contrib/llvm-project/libc/src/__support/math/ldexpf128.h
new file mode 100644
index 000000000000..362583093b2f
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/math/ldexpf128.h
@@ -0,0 +1,34 @@
+//===-- Implementation header for ldexpf ------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MATH_LDEXPF128_H
+#define LLVM_LIBC_SRC___SUPPORT_MATH_LDEXPF128_H
+
+#include "include/llvm-libc-types/float128.h"
+
+#ifdef LIBC_TYPES_HAS_FLOAT128
+
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace math {
+
+static constexpr float128 ldexpf128(float128 x, int exp) {
+  return fputil::ldexp(x, exp);
+}
+
+} // namespace math
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LIBC_TYPES_HAS_FLOAT128
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MATH_LDEXPF128_H
diff --git a/contrib/llvm-project/libc/src/__support/math/ldexpf16.h b/contrib/llvm-project/libc/src/__support/math/ldexpf16.h
new file mode 100644
index 000000000000..fbead87d909a
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/math/ldexpf16.h
@@ -0,0 +1,34 @@
+//===-- Implementation header for ldexpf16 ----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MATH_LDEXPF16_H
+#define LLVM_LIBC_SRC___SUPPORT_MATH_LDEXPF16_H
+
+#include "include/llvm-libc-macros/float16-macros.h"
+
+#ifdef LIBC_TYPES_HAS_FLOAT16
+
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace math {
+
+static constexpr float16 ldexpf16(float16 x, int exp) {
+  return fputil::ldexp(x, exp);
+}
+
+} // namespace math
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LIBC_TYPES_HAS_FLOAT16
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MATH_LDEXPF16_H
diff --git a/contrib/llvm-project/libc/src/__support/math_extras.h b/contrib/llvm-project/libc/src/__support/math_extras.h
new file mode 100644
index 000000000000..47df2a43250c
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/math_extras.h
@@ -0,0 +1,160 @@
+//===-- Mimics llvm/Support/MathExtras.h ------------------------*- C++ -*-===//
+// Provides useful math functions.
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MATH_EXTRAS_H
+#define LLVM_LIBC_SRC___SUPPORT_MATH_EXTRAS_H
+
+#include "src/__support/CPP/bit.h"         // countl_one, countr_zero
+#include "src/__support/CPP/limits.h"      // CHAR_BIT, numeric_limits
+#include "src/__support/CPP/type_traits.h" // is_unsigned_v, is_constant_evaluated
+#include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+// Create a bitmask with the count right-most bits set to 1, and all other bits
+// set to 0.  Only unsigned types are allowed.
+template <typename T, size_t count>
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, T>
+mask_trailing_ones() {
+  constexpr unsigned T_BITS = CHAR_BIT * sizeof(T);
+  static_assert(count <= T_BITS && "Invalid bit index");
+  return count == 0 ? 0 : (T(-1) >> (T_BITS - count));
+}
+
+// Create a bitmask with the count left-most bits set to 1, and all other bits
+// set to 0.  Only unsigned types are allowed.
+template <typename T, size_t count>
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, T>
+mask_leading_ones() {
+  return T(~mask_trailing_ones<T, CHAR_BIT * sizeof(T) - count>());
+}
+
+// Create a bitmask with the count right-most bits set to 0, and all other bits
+// set to 1.  Only unsigned types are allowed.
+template <typename T, size_t count>
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, T>
+mask_trailing_zeros() {
+  return mask_leading_ones<T, CHAR_BIT * sizeof(T) - count>();
+}
+
+// Create a bitmask with the count left-most bits set to 0, and all other bits
+// set to 1.  Only unsigned types are allowed.
+template <typename T, size_t count>
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, T>
+mask_leading_zeros() {
+  return mask_trailing_ones<T, CHAR_BIT * sizeof(T) - count>();
+}
+
+// Returns whether 'a + b' overflows, the result is stored in 'res'.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr bool add_overflow(T a, T b, T &res) {
+  return __builtin_add_overflow(a, b, &res);
+}
+
+// Returns whether 'a - b' overflows, the result is stored in 'res'.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr bool sub_overflow(T a, T b, T &res) {
+  return __builtin_sub_overflow(a, b, &res);
+}
+
+#define RETURN_IF(TYPE, BUILTIN)                                               \
+  if constexpr (cpp::is_same_v<T, TYPE>)                                       \
+    return BUILTIN(a, b, carry_in, carry_out);
+
+// Returns the result of 'a + b' taking into account 'carry_in'.
+// The carry out is stored in 'carry_out' it not 'nullptr', dropped otherwise.
+// We keep the pass by pointer interface for consistency with the intrinsic.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, T>
+add_with_carry(T a, T b, T carry_in, T &carry_out) {
+  if constexpr (!cpp::is_constant_evaluated()) {
+#if __has_builtin(__builtin_addcb)
+    RETURN_IF(unsigned char, __builtin_addcb)
+#elif __has_builtin(__builtin_addcs)
+    RETURN_IF(unsigned short, __builtin_addcs)
+#elif __has_builtin(__builtin_addc)
+    RETURN_IF(unsigned int, __builtin_addc)
+#elif __has_builtin(__builtin_addcl)
+    RETURN_IF(unsigned long, __builtin_addcl)
+#elif __has_builtin(__builtin_addcll)
+    RETURN_IF(unsigned long long, __builtin_addcll)
+#endif
+  }
+  T sum = {};
+  T carry1 = add_overflow(a, b, sum);
+  T carry2 = add_overflow(sum, carry_in, sum);
+  carry_out = carry1 | carry2;
+  return sum;
+}
+
+// Returns the result of 'a - b' taking into account 'carry_in'.
+// The carry out is stored in 'carry_out' it not 'nullptr', dropped otherwise.
+// We keep the pass by pointer interface for consistency with the intrinsic.
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, T>
+sub_with_borrow(T a, T b, T carry_in, T &carry_out) {
+  if constexpr (!cpp::is_constant_evaluated()) {
+#if __has_builtin(__builtin_subcb)
+    RETURN_IF(unsigned char, __builtin_subcb)
+#elif __has_builtin(__builtin_subcs)
+    RETURN_IF(unsigned short, __builtin_subcs)
+#elif __has_builtin(__builtin_subc)
+    RETURN_IF(unsigned int, __builtin_subc)
+#elif __has_builtin(__builtin_subcl)
+    RETURN_IF(unsigned long, __builtin_subcl)
+#elif __has_builtin(__builtin_subcll)
+    RETURN_IF(unsigned long long, __builtin_subcll)
+#endif
+  }
+  T sub = {};
+  T carry1 = sub_overflow(a, b, sub);
+  T carry2 = sub_overflow(sub, carry_in, sub);
+  carry_out = carry1 | carry2;
+  return sub;
+}
+
+#undef RETURN_IF
+
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, int>
+first_leading_zero(T value) {
+  return value == cpp::numeric_limits<T>::max() ? 0
+                                                : cpp::countl_one(value) + 1;
+}
+
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, int>
+first_leading_one(T value) {
+  return first_leading_zero(static_cast<T>(~value));
+}
+
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, int>
+first_trailing_zero(T value) {
+  return value == cpp::numeric_limits<T>::max()
+             ? 0
+             : cpp::countr_zero(static_cast<T>(~value)) + 1;
+}
+
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, int>
+first_trailing_one(T value) {
+  return value == 0 ? 0 : cpp::countr_zero(value) + 1;
+}
+
+template <typename T>
+[[nodiscard]] LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_unsigned_v<T>, int>
+count_zeros(T value) {
+  return cpp::popcount<T>(static_cast<T>(~value));
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MATH_EXTRAS_H
diff --git a/contrib/llvm-project/libc/src/__support/memory_size.h b/contrib/llvm-project/libc/src/__support/memory_size.h
new file mode 100644
index 000000000000..3d40b113bcb6
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/memory_size.h
@@ -0,0 +1,92 @@
+//===-- Memory Size ---------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MEMORY_SIZE_H
+#define LLVM_LIBC_SRC___SUPPORT_MEMORY_SIZE_H
+
+#include "src/__support/CPP/bit.h" // has_single_bit
+#include "src/__support/CPP/limits.h"
+#include "src/__support/CPP/type_traits.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h"
+#include "src/string/memory_utils/utils.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+template <class T> LIBC_INLINE bool mul_overflow(T a, T b, T *res) {
+#if __has_builtin(__builtin_mul_overflow)
+  return __builtin_mul_overflow(a, b, res);
+#else
+  T max = cpp::numeric_limits<T>::max();
+  T min = cpp::numeric_limits<T>::min();
+  bool overflow = (b > 0 && (a > max / b || a < min / b)) ||
+                  (b < 0 && (a < max / b || a > min / b));
+  if (!overflow)
+    *res = a * b;
+  return overflow;
+#endif
+}
+// Limit memory size to the max of ssize_t
+class SafeMemSize {
+private:
+  using type = cpp::make_signed_t<size_t>;
+  type value;
+  LIBC_INLINE explicit SafeMemSize(type value) : value(value) {}
+
+public:
+  LIBC_INLINE_VAR static constexpr size_t MAX_MEM_SIZE =
+      static_cast<size_t>(cpp::numeric_limits<type>::max());
+
+  LIBC_INLINE explicit SafeMemSize(size_t value)
+      : value(value <= MAX_MEM_SIZE ? static_cast<type>(value) : -1) {}
+
+  LIBC_INLINE static constexpr size_t offset_to(size_t val, size_t align) {
+    return (-val) & (align - 1);
+  }
+
+  LIBC_INLINE operator size_t() { return static_cast<size_t>(value); }
+
+  LIBC_INLINE bool valid() { return value >= 0; }
+
+  LIBC_INLINE SafeMemSize operator+(const SafeMemSize &other) {
+    type result;
+    if (LIBC_UNLIKELY((value | other.value) < 0)) {
+      result = -1;
+    } else {
+      result = value + other.value;
+    }
+    return SafeMemSize{result};
+  }
+
+  LIBC_INLINE SafeMemSize operator*(const SafeMemSize &other) {
+    type result;
+    if (LIBC_UNLIKELY((value | other.value) < 0))
+      result = -1;
+    if (LIBC_UNLIKELY(mul_overflow(value, other.value, &result)))
+      result = -1;
+    return SafeMemSize{result};
+  }
+
+  LIBC_INLINE SafeMemSize align_up(size_t alignment) {
+    if (!cpp::has_single_bit(alignment) || alignment > MAX_MEM_SIZE || !valid())
+      return SafeMemSize{type{-1}};
+
+    type offset =
+        static_cast<type>(offset_to(static_cast<size_t>(value), alignment));
+
+    if (LIBC_UNLIKELY(offset > static_cast<type>(MAX_MEM_SIZE) - value))
+      return SafeMemSize{type{-1}};
+
+    return SafeMemSize{value + offset};
+  }
+};
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MEMORY_SIZE_H
diff --git a/contrib/llvm-project/libc/src/__support/number_pair.h b/contrib/llvm-project/libc/src/__support/number_pair.h
new file mode 100644
index 000000000000..f5e877406d8f
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/number_pair.h
@@ -0,0 +1,26 @@
+//===-- Utilities for pairs of numbers. -------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_NUMBER_PAIR_H
+#define LLVM_LIBC_SRC___SUPPORT_NUMBER_PAIR_H
+
+#include "CPP/type_traits.h"
+#include "src/__support/macros/config.h"
+
+#include <stddef.h>
+
+namespace LIBC_NAMESPACE_DECL {
+
+template <typename T> struct NumberPair {
+  T lo = T(0);
+  T hi = T(0);
+};
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_NUMBER_PAIR_H
diff --git a/contrib/llvm-project/libc/src/__support/ryu_constants.h b/contrib/llvm-project/libc/src/__support/ryu_constants.h
new file mode 100644
index 000000000000..1ecb34e661ba
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/ryu_constants.h
@@ -0,0 +1,4404 @@
+//===-- Ryu Constants for float conversion ----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_RYU_CONSTANTS_H
+#define LLVM_LIBC_SRC___SUPPORT_RYU_CONSTANTS_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+constexpr size_t TABLE_SHIFT_CONST = 120;
+constexpr size_t IDX_SIZE = 16;
+
+constexpr size_t MID_INT_SIZE = 192;
+
+constexpr uint16_t POW10_OFFSET[64] = {
+    0,   2,   5,   8,   12,  16,  21,   26,   32,   39,   46,   54,  62,
+    71,  80,  90,  100, 111, 122, 134,  146,  159,  173,  187,  202, 217,
+    233, 249, 266, 283, 301, 319, 338,  357,  377,  397,  418,  440, 462,
+    485, 508, 532, 556, 581, 606, 632,  658,  685,  712,  740,  769, 798,
+    828, 858, 889, 920, 952, 984, 1017, 1050, 1084, 1118, 1153, 1188};
+
+constexpr uint64_t POW10_SPLIT[1224][3] = {
+    {1u, 72057594037927936u, 0u},
+    {699646928636035157u, 72057594u, 0u},
+    {1u, 0u, 256u},
+    {11902091922964236229u, 4722366482869u, 0u},
+    {6760415703743915872u, 4722u, 0u},
+    {1u, 0u, 16777216u},
+    {13369850649504950658u, 309485009821345068u, 0u},
+    {15151142278969419334u, 309485009u, 0u},
+    {1u, 0u, 75511627776u},
+    {4635408826454083567u, 9437866644873197963u, 1099u},
+    {12367138975830625353u, 20282409603651u, 0u},
+    {7555853734021184432u, 20282u, 0u},
+    {1u, 0u, 250037927936u},
+    {5171444645924616995u, 699646928636035156u, 72057594u},
+    {16672297533003297786u, 1329227995784915872u, 0u},
+    {14479142226848862515u, 1329227995u, 0u},
+    {1u, 0u, 181645213696u},
+    {12214193123817091081u, 11902091922964236228u, 114366482869u},
+    {16592893013671929435u, 6760415703743915871u, 4722u},
+    {4549827147718617003u, 87112285931760u, 0u},
+    {5274510003815168971u, 87112u, 0u},
+    {1u, 0u, 44724781056u},
+    {9794971998307800535u, 13369850649504950657u, 209821345068u},
+    {14720142899209240169u, 15151142278969419333u, 309485009u},
+    {4300745446091561535u, 5708990770823839524u, 0u},
+    {15197156861335443364u, 5708990770u, 0u},
+    {1u, 0u, 139251286016u},
+    {13484604155038683037u, 4635408826454083566u, 67670423947u},
+    {8356963862052375699u, 12367138975830625352u, 58409603651u},
+    {5850852848337610021u, 7555853734021184431u, 20282u},
+    {2712780827214982050u, 374144419156711u, 0u},
+    {7732076577307618052u, 374144u, 0u},
+    {1u, 0u, 84280344576u},
+    {17296309485351745867u, 5171444645924616994u, 160903807060u},
+    {16598859101615853088u, 16672297533003297785u, 219784915872u},
+    {7469952526870444257u, 14479142226848862514u, 1329227995u},
+    {13531654022114669524u, 6073184580144670117u, 1u},
+    {15757609704383306943u, 24519928653u, 0u},
+    {9590990814237149590u, 24u, 0u},
+    {1u, 0u, 196662132736u},
+    {15408590707489433890u, 12214193123817091080u, 95899502532u},
+    {18332056844289122710u, 16592893013671929434u, 240246646623u},
+    {11114572877353986193u, 4549827147718617002u, 72285931760u},
+    {1703393793997526525u, 5274510003815168970u, 87112u},
+    {5082852056285196265u, 1606938044258990u, 0u},
+    {816434266573722365u, 1606938u, 0u},
+    {1u, 0u, 129530986496u},
+    {5736523019264798742u, 9794971998307800534u, 69797980545u},
+    {10129314776268243339u, 14720142899209240168u, 36233143877u},
+    {16511595775483995364u, 4300745446091561534u, 50823839524u},
+    {12367293405401453325u, 15197156861335443363u, 5708990770u},
+    {16934621733248854291u, 13078571300009428617u, 5u},
+    {10278280417769171336u, 105312291668u, 0u},
+    {5760764486226151240u, 105u, 0u},
+    {1u, 0u, 238731001856u},
+    {4128368337188369761u, 13484604155038683036u, 72453031918u},
+    {10240941003671005056u, 8356963862052375698u, 175317175368u},
+    {17933378316822368251u, 5850852848337610020u, 231147060143u},
+    {8346249813075698616u, 2712780827214982049u, 128419156711u},
+    {15906203609160902695u, 7732076577307618051u, 374144u},
+    {14525607416135386328u, 6901746346790563u, 0u},
+    {6397156777364256320u, 6901746u, 0u},
+    {1u, 0u, 34937634816u},
+    {16798760952716600048u, 17296309485351745866u, 249899825954u},
+    {2419982808370854967u, 16598859101615853087u, 50404946937u},
+    {2922947087773078956u, 7469952526870444256u, 165733552434u},
+    {15419220167069510190u, 13531654022114669523u, 77854221733u},
+    {3452124642157173416u, 15757609704383306942u, 24519928653u},
+    {5979700067267186899u, 9590990814237149589u, 24u},
+    {4913998146922579597u, 452312848583u, 0u},
+    {5771037749337678924u, 452u, 0u},
+    {1u, 0u, 8835301376u},
+    {3464734175350698519u, 15408590707489433889u, 90993782792u},
+    {9334527711335850125u, 18332056844289122709u, 170602522202u},
+    {7269882896518450106u, 11114572877353986192u, 202092341162u},
+    {1372511258182263196u, 1703393793997526524u, 174275541962u},
+    {7571228438575951046u, 5082852056285196264u, 26044258990u},
+    {2992506536646070406u, 816434266573722364u, 1606938u},
+    {524517896824344606u, 29642774844752946u, 0u},
+    {15582941400898702773u, 29642774u, 0u},
+    {1u, 0u, 214310977536u},
+    {3846112492507251066u, 5736523019264798741u, 104549111254u},
+    {16681117750123089487u, 10129314776268243338u, 62895095400u},
+    {14986314536556547267u, 16511595775483995363u, 163670432318u},
+    {2573712825027107389u, 12367293405401453324u, 137918027683u},
+    {7504855874008324928u, 16934621733248854290u, 84557186697u},
+    {9572138030626879787u, 10278280417769171335u, 105312291668u},
+    {8520676959353394843u, 5760764486226151239u, 105u},
+    {13448984662897903496u, 1942668892225u, 0u},
+    {12338883700918130648u, 1942u, 0u},
+    {1u, 0u, 156223799296u},
+    {2517285787892561600u, 4128368337188369760u, 146555162524u},
+    {4338831817635138103u, 10240941003671005055u, 36972170386u},
+    {1561495325934523196u, 17933378316822368250u, 161452451108u},
+    {12262635050079398786u, 8346249813075698615u, 3862277025u},
+    {11144065765517284188u, 15906203609160902694u, 163787434755u},
+    {1212260522471875711u, 14525607416135386327u, 242346790563u},
+    {9695352922247418869u, 6397156777364256319u, 6901746u},
+    {7227025834627242948u, 127314748520905380u, 0u},
+    {9609008238705447829u, 127314748u, 0u},
+    {1u, 0u, 74910662656u},
+    {3609144142396852269u, 16798760952716600047u, 31131187530u},
+    {11568848377382068865u, 2419982808370854966u, 224158453279u},
+    {10068303578029323957u, 2922947087773078955u, 211835877600u},
+    {11645070846862630231u, 15419220167069510189u, 190187140051u},
+    {12449386705878485055u, 3452124642157173415u, 149324160190u},
+    {15025619323517318418u, 5979700067267186898u, 199266388373u},
+    {14996237555047131272u, 4913998146922579596u, 196312848583u},
+    {10211005638256058413u, 5771037749337678923u, 452u},
+    {1014743503555840530u, 8343699359066u, 0u},
+    {12900897707145290678u, 8343u, 0u},
+    {1u, 0u, 33187823616u},
+    {4718003016239473662u, 3464734175350698518u, 149506025761u},
+    {14865830648693666725u, 9334527711335850124u, 144394101141u},
+    {14754517212823091778u, 7269882896518450105u, 252074403984u},
+    {11113946551474911901u, 1372511258182263195u, 232410437116u},
+    {1963520352638130630u, 7571228438575951045u, 252162224104u},
+    {13342587341404964200u, 2992506536646070405u, 50028434172u},
+    {6240392545013573291u, 524517896824344605u, 22844752946u},
+    {14377490861349714758u, 15582941400898702772u, 29642774u},
+    {1717863312631397839u, 546812681195752981u, 0u},
+    {3611005143890591770u, 546812681u, 0u},
+    {1u, 0u, 21208498176u},
+    {13168252824351245504u, 3846112492507251065u, 138904285205u},
+    {735883891883379688u, 16681117750123089486u, 227812409738u},
+    {10609203866866106404u, 14986314536556547266u, 12139521251u},
+    {12358191111890306470u, 2573712825027107388u, 18406839052u},
+    {15229916368406413528u, 7504855874008324927u, 135518906642u},
+    {7241424335568075942u, 9572138030626879786u, 71461906823u},
+    {6049715868779871913u, 8520676959353394842u, 65729070919u},
+    {2000548404719336762u, 13448984662897903495u, 150668892225u},
+    {1410974761895205301u, 12338883700918130647u, 1942u},
+    {16000132467694084868u, 35835915874844u, 0u},
+    {16894908866816792556u, 35835u, 0u},
+    {1u, 0u, 96136462336u},
+    {589096329272056762u, 2517285787892561599u, 127235208544u},
+    {7097729792403256904u, 4338831817635138102u, 250084648831u},
+    {8553736750439287020u, 1561495325934523195u, 183664758778u},
+    {2114152625261065696u, 12262635050079398785u, 38604121015u},
+    {9817523680007641224u, 11144065765517284187u, 215065716774u},
+    {13047215537500048015u, 1212260522471875710u, 63525586135u},
+    {16755544192002345880u, 9695352922247418868u, 164391777855u},
+    {6930119832670648356u, 7227025834627242947u, 60520905380u},
+    {14560698131901886167u, 9609008238705447828u, 127314748u},
+    {16408020927503338035u, 2348542582773833227u, 0u},
+    {14274703510609809116u, 2348542582u, 0u},
+    {1u, 0u, 239195652096u},
+    {16428432973129962470u, 3609144142396852268u, 54627148527u},
+    {3721112279790863774u, 11568848377382068864u, 171545803830u},
+    {18032764903259620753u, 10068303578029323956u, 45631280555u},
+    {18058455550468776079u, 11645070846862630230u, 167674882605u},
+    {15692090139033993190u, 12449386705878485054u, 210814540455u},
+    {389416944300619393u, 15025619323517318417u, 140812947666u},
+    {12009691357260487293u, 14996237555047131271u, 75553539724u},
+    {13494259174449809900u, 10211005638256058412u, 90055009355u},
+    {18288583400616279877u, 1014743503555840529u, 151699359066u},
+    {7216107869057472u, 12900897707145290677u, 8343u},
+    {17237061291959073878u, 153914086704665u, 0u},
+    {1599418782488783273u, 153914u, 0u},
+    {1u, 0u, 22255763456u},
+    {9565464987240335777u, 4718003016239473661u, 140805878294u},
+    {857713933775880687u, 14865830648693666724u, 185799843980u},
+    {4621617820081363356u, 14754517212823091777u, 155602488249u},
+    {9630162611715632528u, 11113946551474911900u, 197106442651u},
+    {9283986497984645815u, 1963520352638130629u, 133723303109u},
+    {8981807745082630996u, 13342587341404964199u, 29338292357u},
+    {18350140531565934622u, 6240392545013573290u, 180779405341u},
+    {4411619033127524143u, 14377490861349714757u, 21093125556u},
+    {1852297584111266889u, 1717863312631397838u, 9195752981u},
+    {11746243463811666096u, 3611005143890591769u, 546812681u},
+    {6335244004343789147u, 10086913586276986678u, 0u},
+    {5109502367228239844u, 10086913586u, 0u},
+    {1603272682579847821u, 10u, 0u},
+    {1u, 0u, 121713852416u},
+    {6609546910952910052u, 13168252824351245503u, 78039892345u},
+    {3911171343112928288u, 735883891883379687u, 194575126094u},
+    {5254510615100863555u, 10609203866866106403u, 60669938882u},
+    {3881927570803887650u, 12358191111890306469u, 63825615420u},
+    {6379348759607163190u, 15229916368406413527u, 42392558399u},
+    {14595733737222406466u, 7241424335568075941u, 154327955754u},
+    {14670223432002373542u, 6049715868779871912u, 135108449946u},
+    {4045087795619708513u, 2000548404719336761u, 215076489095u},
+    {12598467307137142718u, 1410974761895205300u, 28867368919u},
+    {734704388050777108u, 16000132467694084867u, 251915874844u},
+    {5682201693687285822u, 16894908866816792555u, 35835u},
+    {11048712694145438788u, 661055968790248u, 0u},
+    {17871025777010319485u, 661055u, 0u},
+    {1u, 0u, 191031934976u},
+    {15268761435931663695u, 589096329272056761u, 54384768703u},
+    {5016238054648555438u, 7097729792403256903u, 59463698998u},
+    {14236047313993899750u, 8553736750439287019u, 129114608443u},
+    {6957759675154690848u, 2114152625261065695u, 91532209025u},
+    {18439367135478514473u, 9817523680007641223u, 126707290971u},
+    {8539004472540641041u, 13047215537500048014u, 244908319870u},
+    {1908462039431738399u, 16755544192002345879u, 195375682548u},
+    {714690453250792146u, 6930119832670648355u, 148789337027u},
+    {13782189447673929633u, 14560698131901886166u, 11889480596u},
+    {3584742913798803164u, 16408020927503338034u, 118773833227u},
+    {4347581515245125291u, 14274703510609809115u, 2348542582u},
+    {16836742268156371392u, 6429475823218628948u, 2u},
+    {11764082328865615308u, 43322963970u, 0u},
+    {5957633711383291746u, 43u, 0u},
+    {1u, 0u, 44890587136u},
+    {9917186842884466953u, 16428432973129962469u, 128201721900u},
+    {4751011869809829335u, 3721112279790863773u, 180977558144u},
+    {11068497969931435029u, 18032764903259620752u, 86978950836u},
+    {17118056985122509954u, 18058455550468776078u, 62850669910u},
+    {14607066080907684459u, 15692090139033993189u, 17021110334u},
+    {11768892370493391107u, 389416944300619392u, 135651046673u},
+    {4043396447647747170u, 12009691357260487292u, 44731525255u},
+    {1670341095362518057u, 13494259174449809899u, 17991426092u},
+    {3190817644167043165u, 18288583400616279876u, 181000391185u},
+    {10425820027224322486u, 7216107869057471u, 25934422965u},
+    {13139964660506311565u, 17237061291959073877u, 58086704665u},
+    {2297772885416059937u, 1599418782488783272u, 153914u},
+    {7677687919964523763u, 2839213766779714u, 0u},
+    {14144589152747892828u, 2839213u, 0u},
+    {1u, 0u, 253518544896u},
+    {17069730341503660290u, 9565464987240335776u, 164046496765u},
+    {18167423787163077107u, 857713933775880686u, 65250538404u},
+    {3765746945827805904u, 4621617820081363355u, 156522052161u},
+    {10241734342430761691u, 9630162611715632527u, 197503285916u},
+    {13345717282537140784u, 9283986497984645814u, 103486904773u},
+    {9313926784816939953u, 8981807745082630995u, 170994763111u},
+    {550974205049535019u, 18350140531565934621u, 69239154346u},
+    {4494692285504086222u, 4411619033127524142u, 206100413253u},
+    {1134308559863725587u, 1852297584111266888u, 25636765134u},
+    {17587558045116130233u, 11746243463811666095u, 54343434265u},
+    {9817142032346161594u, 6335244004343789146u, 50276986678u},
+    {6071944935834172568u, 5109502367228239843u, 10086913586u},
+    {11564168293299416955u, 1603272682579847820u, 10u},
+    {12458266507226064437u, 186070713419u, 0u},
+    {1304432355328256915u, 186u, 0u},
+    {1u, 0u, 191358304256u},
+    {15946798815542087355u, 6609546910952910051u, 231212025023u},
+    {12082566083831286138u, 3911171343112928287u, 35284847591u},
+    {11449623684706196411u, 5254510615100863554u, 165210439715u},
+    {17518743620362604446u, 3881927570803887649u, 215345825189u},
+    {9451061563087633805u, 6379348759607163189u, 165791236311u},
+    {13191114787623314926u, 14595733737222406465u, 168795274405u},
+    {8367349876734474799u, 14670223432002373541u, 57219284648u},
+    {6544253801674393507u, 4045087795619708512u, 180682964281u},
+    {16113906253336597498u, 12598467307137142717u, 3039828404u},
+    {10294087136797312392u, 734704388050777107u, 235308032771u},
+    {9127173070014462803u, 5682201693687285821u, 232598951915u},
+    {16266900839595484952u, 11048712694145438787u, 63968790248u},
+    {3299745387370952632u, 17871025777010319484u, 661055u},
+    {12061115182604399189u, 12194330274671844u, 0u},
+    {5066801222582989646u, 12194330u, 0u},
+    {1u, 0u, 185827721216u},
+    {7568423425299591513u, 15268761435931663694u, 71271930809u},
+    {16561505984665207377u, 5016238054648555437u, 235771737671u},
+    {4329114621856906245u, 14236047313993899749u, 223377180907u},
+    {1477500474861899139u, 6957759675154690847u, 135999600095u},
+    {16891579639263969684u, 18439367135478514472u, 142462900359u},
+    {4684451357140027420u, 8539004472540641040u, 151103457934u},
+    {14727186580409080709u, 1908462039431738398u, 35038743447u},
+    {15864176859687308834u, 714690453250792145u, 214747133987u},
+    {1755486942842684438u, 13782189447673929632u, 50194329302u},
+    {17417077516652710041u, 3584742913798803163u, 219235682866u},
+    {4290982361913532783u, 4347581515245125290u, 84912721627u},
+    {11826659981004351409u, 16836742268156371391u, 2637732180u},
+    {932930645678090820u, 11764082328865615307u, 43322963970u},
+    {12707792781328052617u, 5957633711383291745u, 43u},
+    {16491596426880311906u, 799167628880u, 0u},
+    {3092207065214166010u, 799u, 0u},
+    {1u, 0u, 229537611776u},
+    {8142946531605512550u, 9917186842884466952u, 157257552869u},
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+    {2897692901883393664u, 163499238u, 0u},
+    {1u, 0u, 159339380736u},
+    {12323704802554838154u, 6260469580539185877u, 8965946783u},
+    {7135886931147821732u, 17818573101084525840u, 164119318024u},
+    {15341283120292884947u, 2201029069927307149u, 62563676580u},
+    {3092789040392634166u, 10397997613804897038u, 206773573694u},
+    {8811761390822097865u, 14269915965770103740u, 171909436366u},
+    {16870860798610218169u, 16776139909196366726u, 54338624171u},
+    {17452041453591904833u, 6246513436385199719u, 6158620214u},
+    {10314783684009874908u, 2926026498821554287u, 225852481030u},
+    {4932636630789274903u, 15725499391028340981u, 121464937185u},
+    {18143884346082124480u, 8576577277771450826u, 54841522553u},
+    {2823209155405527322u, 15523351176022259334u, 85258861878u},
+    {16195396106620226251u, 4775158829429176133u, 152549789013u},
+    {1150544491807648944u, 10141817222123532461u, 212696472984u},
+    {7767455475523884824u, 12847658900242624585u, 171743122900u},
+    {15204378045683991808u, 13708197964460514654u, 104105793195u},
+    {17239732561718805622u, 1951540006613246931u, 153540978792u},
+    {12886430624522800062u, 9979297327280092198u, 49833822361u},
+    {18162250541178258136u, 15381307706282553683u, 16544130097u},
+    {17028935366700158084u, 10037428657543061176u, 17140126480u},
+    {16075467823964198637u, 2584877324547208667u, 178061074449u},
+    {9803858825574498304u, 1126624732730703575u, 80081372850u},
+    {17464070808143041817u, 1501064139624981019u, 35282958416u},
+    {17682703471239266776u, 5219661484955306108u, 113289319203u},
+    {18147688354161351336u, 5336997298570282211u, 56660882545u},
+    {6663423873348080051u, 12191131175733833361u, 241200960568u},
+    {9417270363716235133u, 3707068178994436535u, 61273516273u},
+    {9295013721571344179u, 5045484691732942021u, 75804906301u},
+    {6199479138350037783u, 14847900542908711231u, 73493163339u},
+    {887603005365085688u, 9097257915916965134u, 226134008905u},
+    {333989628642975696u, 2472027983230314216u, 68865979874u},
+    {4620735991403939439u, 15974509111133272204u, 580u},
+    {12418523063962801201u, 10715086071862u, 0u},
+    {1587745622680169419u, 10715u, 0u},
+    {1u, 0u, 225655914496u},
+    {10968905082284365638u, 12099486841948187398u, 72288392929u},
+    {14076907092801977812u, 5319910566029976327u, 139626084168u},
+    {3438322122816124202u, 11549214421017285863u, 77108354699u},
+    {14645413324829073676u, 1998791413186046699u, 8925646925u},
+    {12271281439492289999u, 17075171930090011209u, 208821732872u},
+    {6233751789862708246u, 15158296003813501473u, 176073730256u},
+    {1962644459455827991u, 1360083178079384114u, 155334366896u},
+    {8726934184642952500u, 6167980558592741157u, 60196792475u},
+    {4531087719737475147u, 3630180428124865652u, 6123412028u},
+    {481513520412720775u, 2276550099763657676u, 110022063878u},
+    {992149349835802669u, 407006713016100654u, 68772091758u},
+    {11165474436676191361u, 14242579061653496001u, 190972772932u},
+    {10240785855143707184u, 17944493332678643703u, 76053515454u},
+    {10059329918238932466u, 987185901870869451u, 61302420044u},
+    {14791716450947031886u, 5578665155415167744u, 21262876221u},
+    {15378882314737417403u, 4849210377429577535u, 125586119445u},
+    {14726970229242271128u, 10811995403388891861u, 117382285949u},
+    {5090110549507128156u, 7051931074990177293u, 76110091637u},
+    {17185220781106503841u, 2030832259446664274u, 223329028940u},
+    {9858517691519529306u, 6069512651054767895u, 162575098847u},
+    {5595905546638020703u, 10608701253763958798u, 212851101602u},
+    {15555173226968030256u, 15700053443426906716u, 111962756308u},
+    {10745236628845355771u, 17759719234725541221u, 16823306351u},
+    {9973314042399760760u, 15187321568916405209u, 47598488080u},
+    {4374506813558796576u, 11040156458113129593u, 114151827759u},
+    {15960826480426749933u, 2800727824598008496u, 5162480498u},
+    {9636454862798615738u, 2997236166375604478u, 14339360261u},
+    {17973331528911319269u, 6260091886451512840u, 63952637454u},
+    {7366495200039369602u, 17573059315228347473u, 78407630399u},
+    {10505831326526933399u, 7519453664590169250u, 176857031246u},
+    {2803218632575724145u, 15809436065653866528u, 38067632u},
+    {8425731874431741636u, 702223880805592151u, 0u},
+    {14860552245711912111u, 702223880u, 0u},
+    {1u, 0u, 234012409856u},
+    {6993664200669526994u, 228921437623588921u, 212119037930u},
+    {4065363582031999356u, 2195862230003073883u, 71052052948u},
+    {6899780515342669867u, 960207412233973687u, 189133594695u},
+    {17713500890201844939u, 2464387149230492478u, 247196883901u},
+    {6445781125105107086u, 3631866936444955212u, 93085560055u},
+    {13563044070717478571u, 1578304441149380226u, 223986111069u},
+    {13167612994149348885u, 18190538519673445180u, 153068901087u},
+    {5505463469596727288u, 1271000736479934748u, 96991663513u},
+    {12125446212518819372u, 18292963032817745633u, 151930679904u},
+    {12537707724735421794u, 17168014021925537454u, 165978316695u},
+    {15173675086703777069u, 18046757712870378948u, 167805453733u},
+    {13535510174093048476u, 14857998893911743219u, 7646922151u},
+    {10698912997087096629u, 11933607369968684574u, 179188857095u},
+    {16952559548431933861u, 3483798509902859161u, 107400007091u},
+    {13528255827744249993u, 7378828438829845830u, 75856039275u},
+    {14122167436324771955u, 15791137430347699564u, 11923964747u},
+    {13071007137740038297u, 17044141236829932640u, 221491992075u},
+    {13011887609328904025u, 9075651910862456483u, 46965547485u},
+    {3116434332871336590u, 17811207355884564094u, 59240619054u},
+    {9050993820536772770u, 4438638126207305936u, 57678058555u},
+    {11993719123438634238u, 12507972635512950184u, 225794626361u},
+    {1414857165879849301u, 14658269128098109407u, 119197456865u},
+    {13819438220812375094u, 3642436268910286110u, 196205082231u},
+    {6073063033888264440u, 3783099432964819560u, 54514864836u},
+    {6828883869150720294u, 9497579866027539637u, 222184053046u},
+    {4548265621068768345u, 3395179445046271360u, 152321926878u},
+    {10422524923581371874u, 5938502732309497275u, 224314075544u},
+    {1858996082510682634u, 5793671185917606254u, 224048207584u},
+    {890276727450878316u, 889272970253526587u, 90465891296u},
+    {3886008133802710905u, 8594177504370135500u, 102399764570u},
+    {612074409233016757u, 7374354721120724711u, 190800386918u},
+    {3927020336901729264u, 14764532643665507566u, 2494u},
+    {5298603480094474942u, 46020944252475u, 0u},
+    {17418383752590430025u, 46020u, 0u},
+    {1u, 0u, 45292322816u},
+    {8973799690601597929u, 5392404173658087694u, 121269781293u},
+    {1343055462055792431u, 4976586473237854315u, 83342007929u},
+    {17425118728683169659u, 6308932742419013568u, 51261934931u},
+    {18389781726026675967u, 4831846642430703058u, 102983344691u},
+    {272526939565961561u, 18139507855949846900u, 231263777382u},
+    {11293026845930963228u, 4865833876326628409u, 113775023591u},
+    {13997416438903902597u, 14296661839130179260u, 163501702257u},
+    {6186605805999441184u, 9254773150378118247u, 221659992483u},
+    {4401776373281836138u, 12174712433727875142u, 65038253533u},
+    {16338917089754547008u, 705653145340915198u, 114962984513u},
+    {13337700757935003056u, 17763928858962481811u, 50215910002u},
+    {14612496890816348693u, 3982836567612046295u, 156690140722u},
+    {3219935399907691719u, 12730849277561967738u, 88938620316u},
+    {10887238730052330387u, 17314488764367235907u, 102864728152u},
+    {360256418697768294u, 15951418930590301118u, 37389952614u},
+    {321440824631118565u, 7193356087283467260u, 136953715493u},
+    {10069228080701402580u, 17592945625696089445u, 243192687752u},
+    {9428069607611622975u, 3554461664875361427u, 46120009203u},
+    {14736799017468812344u, 2213779057785318207u, 153210386222u},
+    {10875332567307979280u, 3880940796082421147u, 149245476249u},
+    {4611492910339012807u, 4528237545358141042u, 108633238933u},
+    {10743508637597314786u, 11681196539088147362u, 140533156716u},
+    {9356196315668016028u, 9835005502912643016u, 128269103756u},
+    {15755598617722189347u, 4964088126040986695u, 206181905536u},
+    {1275276394173375542u, 3355564873147047621u, 30100456398u},
+    {12644999363867216251u, 1853093467828272926u, 105799888670u},
+    {4553830511509832021u, 14755341584803008676u, 103254872681u},
+    {8869400642218174412u, 4701571132542556620u, 87332245607u},
+    {16570849151159054040u, 6128849686644853850u, 68651977815u},
+    {16127119334101797673u, 12026867901170202093u, 86970890052u},
+    {9686867250420930550u, 17909760324981426302u, 230157084246u},
+    {10678226869774428035u, 2897692901883393663u, 163499238u},
+    {7767227962910162068u, 3016028602530220424u, 0u},
+    {9780840471948993674u, 3016028602u, 0u},
+    {1u, 0u, 213668069376u},
+    {6288709332106746357u, 12323704802554838153u, 16386837205u},
+    {9066785620141948673u, 7135886931147821731u, 141831652624u},
+    {8442375916704414909u, 15341283120292884946u, 14167660429u},
+    {11604629218100425803u, 3092789040392634165u, 188477686542u},
+    {3877248044010875762u, 8811761390822097864u, 134914571196u},
+    {16435137704395217283u, 16870860798610218168u, 103946077062u},
+    {14994442577577813271u, 17452041453591904832u, 111559165543u},
+    {4410105917142436089u, 10314783684009874907u, 245267398767u},
+    {4632574728444936970u, 4932636630789274902u, 202983581941u},
+    {9117147535650050359u, 18143884346082124479u, 134153046474u},
+    {588939301256904809u, 2823209155405527321u, 69877954182u},
+    {324393982565305683u, 16195396106620226250u, 173062371141u},
+    {9380909186923521175u, 1150544491807648943u, 73421074605u},
+    {4463385697777230217u, 7767455475523884823u, 94824230985u},
+    {16378985502426333808u, 15204378045683991807u, 211934567774u},
+    {18210894922387834354u, 17239732561718805621u, 38698574803u},
+    {1555748035329493205u, 12886430624522800061u, 83984577574u},
+    {4277055533891898507u, 18162250541178258135u, 184923140435u},
+    {11574429772510874408u, 17028935366700158083u, 219871452856u},
+    {17391099253493808815u, 16075467823964198636u, 215531468251u},
+    {5791212393959129882u, 9803858825574498303u, 27946729175u},
+    {11254268231455680880u, 17464070808143041816u, 124958581275u},
+    {16355477587312235322u, 17682703471239266775u, 227983788156u},
+    {2411485149249320633u, 18147688354161351335u, 145361224931u},
+    {12763114642070638360u, 6663423873348080050u, 183510511249u},
+    {1147543073987366419u, 9417270363716235132u, 197503883703u},
+    {8410777835225272692u, 9295013721571344178u, 63336074437u},
+    {8134725822306818018u, 6199479138350037782u, 14048117055u},
+    {8899607004752328377u, 887603005365085687u, 232018105614u},
+    {690976506652396830u, 333989628642975695u, 140250490600u},
+    {12281570945595192074u, 4620735991403939438u, 54673209484u},
+    {12592957291365552899u, 12418523063962801200u, 219086071862u},
+    {13595807339013970272u, 1587745622680169418u, 10715u},
+    {9698096389749839992u, 197658450495420u, 0u},
+    {8310173728816391804u, 197658u, 0u},
+};
+
+constexpr uint16_t POW10_OFFSET_2[69] = {
+    0,    2,    6,    12,   20,   29,   40,   52,   66,   80,   95,   112,
+    130,  150,  170,  192,  215,  240,  265,  292,  320,  350,  381,  413,
+    446,  480,  516,  552,  590,  629,  670,  712,  755,  799,  845,  892,
+    940,  989,  1040, 1092, 1145, 1199, 1254, 1311, 1369, 1428, 1488, 1550,
+    1613, 1678, 1743, 1810, 1878, 1947, 2017, 2088, 2161, 2235, 2311, 2387,
+    2465, 2544, 2625, 2706, 2789, 2873, 2959, 3046, 3133};
+
+constexpr uint8_t MIN_BLOCK_2[69] = {
+    0,  0,  0,  0,  0,  0,  1,  1,  2,  3,  3,  4,  4,  5,  5,  6,  6,  7,
+    7,  8,  8,  9,  9,  10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16,
+    17, 17, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23, 24, 24, 25, 26, 26,
+    27, 27, 28, 28, 29, 29, 30, 30, 31, 31, 32, 32, 33, 34, 0};
+
+constexpr uint64_t POW10_SPLIT_2[3133][3] = {
+    {0u, 0u, 3906250u},
+    {0u, 0u, 202000000000u},
+    {0u, 11153727427136454656u, 59u},
+    {0u, 7205759403792793600u, 59604644775u},
+    {0u, 0u, 167390625000u},
+    {0u, 0u, 232000000000u},
+    {0u, 16777216000000000u, 0u},
+    {0u, 12945425605062557696u, 909494u},
+    {0u, 4388757836872548352u, 182701772928u},
+    {0u, 1152921504606846976u, 128237915039u},
+    {0u, 0u, 159062500000u},
+    {0u, 0u, 160000000000u},
+    {0u, 256000000000u, 0u},
+    {0u, 16192327041775828992u, 13u},
+    {0u, 15024075324038053888u, 13877787807u},
+    {0u, 5449091666327633920u, 159814456755u},
+    {0u, 2494994193563254784u, 179295395851u},
+    {0u, 4611686018427387904u, 11135253906u},
+    {0u, 0u, 146250000000u},
+    {0u, 0u, 128000000000u},
+    {0u, 3906250u, 0u},
+    {0u, 3906250000000000u, 0u},
+    {0u, 4368439412768899072u, 211758u},
+    {0u, 1563676642168012800u, 46236813575u},
+    {0u, 11532349341402398720u, 7084767080u},
+    {0u, 9048364970084925440u, 104625169910u},
+    {0u, 16609275425742389248u, 246490512847u},
+    {0u, 0u, 207900390625u},
+    {0u, 0u, 225000000000u},
+    {11153727427136454656u, 59u, 0u},
+    {7205759403792793600u, 59604644775u, 0u},
+    {0u, 4264412554261970152u, 3u},
+    {0u, 14485570586272534528u, 3231174267u},
+    {0u, 17827675094632103936u, 123785264354u},
+    {0u, 7347197909193981952u, 226966440203u},
+    {0u, 13677404030777688064u, 11398292396u},
+    {0u, 3810326759732150272u, 172741453558u},
+    {0u, 9943947977234055168u, 246206558227u},
+    {0u, 0u, 19539062500u},
+    {0u, 0u, 228000000000u},
+    {12945425605062557696u, 909494u, 0u},
+    {4388757836872548352u, 909494701772928u, 0u},
+    {1152921504606846976u, 14878706826214591391u, 49303u},
+    {0u, 4387341015746028192u, 151806576313u},
+    {0u, 651726680428265472u, 185237838233u},
+    {0u, 2570638187944738816u, 153035330174u},
+    {0u, 7419175577111756800u, 126139354575u},
+    {0u, 17299322326264840192u, 207402194313u},
+    {0u, 7990511638862102528u, 137937798142u},
+    {0u, 16717361816799281152u, 254433166503u},
+    {0u, 0u, 167906250000u},
+    {0u, 0u, 16000000000u},
+    {16192327041775828992u, 13u, 0u},
+    {15024075324038053888u, 13877787807u, 0u},
+    {5449091666327633920u, 13877787807814456755u, 0u},
+    {2494994193563254784u, 9707857417284919307u, 752316384u},
+    {4611686018427387904u, 1844515466944871826u, 224526264005u},
+    {0u, 15167599819856275072u, 197099991383u},
+    {0u, 14830185305589481472u, 87822237233u},
+    {0u, 6163721531743535104u, 49803945956u},
+    {0u, 14122847407012052992u, 228334136013u},
+    {0u, 335491783960035328u, 205765601092u},
+    {0u, 941252322120433664u, 68018187046u},
+    {0u, 11529215046068469760u, 38051025390u},
+    {0u, 0u, 238625000000u},
+    {0u, 0u, 64000000000u},
+    {4368439412768899072u, 211758u, 0u},
+    {1563676642168012800u, 211758236813575u, 0u},
+    {11532349341402398720u, 8061591463141767016u, 11479u},
+    {9048364970084925440u, 16628725344207857142u, 215437019748u},
+    {16609275425742389248u, 3555541870038531535u, 100901445007u},
+    {0u, 18316647450161853665u, 143192746310u},
+    {0u, 16709574568378075648u, 70992947447u},
+    {0u, 7696022835795591168u, 247905827852u},
+    {0u, 16664449640376041472u, 12417202233u},
+    {0u, 3109186955116544000u, 57903381625u},
+    {0u, 10515518101817131008u, 121168549362u},
+    {0u, 9961962375743537152u, 242570047378u},
+    {0u, 9223372036854775808u, 146540039062u},
+    {0u, 0u, 150500000000u},
+    {14485570586272534528u, 3231174267u, 0u},
+    {17827675094632103936u, 3231174267785264354u, 0u},
+    {7347197909193981952u, 748977172262750475u, 175162308u},
+    {13677404030777688064u, 15965033457315095468u, 196040602133u},
+    {3810326759732150272u, 16809402149066729206u, 21865466197u},
+    {9943947977234055168u, 7563769067065700371u, 85911239516u},
+    {0u, 13550322810840051428u, 92410032742u},
+    {0u, 8663209637545764864u, 102734564471u},
+    {0u, 8969247575312957440u, 119469633535u},
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+    {8501492578048509537u, 2052996319372883413u, 118273380388u},
+    {2296237701094386060u, 8825683007899981588u, 36111293153u},
+    {3753593040591076946u, 9992196755378745151u, 225478441234u},
+    {8518075399775653155u, 9301073417573669950u, 18541678071u},
+    {12757855675959554597u, 5331614769144850592u, 247504212200u},
+    {121631169379748595u, 14354009428310052102u, 232289027415u},
+    {16679062494579173314u, 5581221063029119078u, 87778132410u},
+    {10739912744743898054u, 1529260335339476189u, 186302558600u},
+    {9367340677776287570u, 16483061525949201148u, 136082901368u},
+    {12227321512794715397u, 14431217812333089675u, 120893548555u},
+    {7241061891859170651u, 3452349151135392267u, 11782317885u},
+    {13148571323079237489u, 9075317899834447999u, 61187152222u},
+    {12509763434355012654u, 2764331337978901575u, 94491973969u},
+    {11812768946960181977u, 1942890683708857202u, 81149854702u},
+    {14170358803552564832u, 165089169728028447u, 238105324315u},
+    {18179989524780635952u, 15193620741871233073u, 27008949501u},
+    {17091718978514754901u, 14995000835194145926u, 253823647830u},
+    {7394768384359232459u, 1788823614552255558u, 86812880624u},
+    {6778628272692852803u, 8384901184618498845u, 240096972322u},
+    {18193335045875234320u, 405511217862281310u, 34454546404u},
+    {1378519212560967521u, 3111530463755196557u, 228021982807u},
+    {4677732610631043584u, 7893558450035460812u, 87168676404u},
+    {17296098591070486528u, 156573858237402216u, 52427910661u},
+    {7343735382392963072u, 15915324019419451223u, 5008487885u},
+    {14525996728454217728u, 16293363012778802804u, 205862771443u},
+    {9691359370008330240u, 14342105318291351412u, 243883264978u},
+    {3044433348102455296u, 3788398842525387052u, 210777487087u},
+    {9223372036854775808u, 14118764407048307670u, 239205369512u},
+    {0u, 2705021334614720768u, 168765379752u},
+    {0u, 7017988973805568000u, 168146639500u},
+    {0u, 10956732053634154496u, 140380445944u},
+    {0u, 14657517938546835456u, 248593965634u},
+    {0u, 11268868284797157376u, 66794585639u},
+    {0u, 14600669991935148032u, 39610886573u},
+    {0u, 4611686018427387904u, 173791503906u},
+    {0u, 0u, 34250000000u},
+    {0u, 0u, 128000000000u},
+    {8201586317771250746u, 1424047269u, 0u},
+    {3278889188817135834u, 1424047269444608885u, 0u},
+    {1710725240251040430u, 3001188830946823627u, 77197757u},
+    {1850175733663425006u, 9732296932705387049u, 189162694772u},
+    {9147599666163914249u, 16337535782679529459u, 116527588873u},
+    {10221885933644344166u, 7969742269895046547u, 9885659589u},
+    {14901479793736678101u, 2923592083903829642u, 197432040594u},
+    {5181831442059703136u, 8144196241160608534u, 146158488244u},
+    {6396246577759793483u, 16431078457793424253u, 180441497762u},
+    {14167229556464870447u, 202362949592775653u, 162890730548u},
+    {2969982933326311854u, 8835125248522947981u, 52010970117u},
+    {7892677766222018881u, 7959873808777345113u, 5478953099u},
+    {798698968922663621u, 14929747122315126151u, 139431505623u},
+    {15926812109043458972u, 4310328817360515349u, 215809343213u},
+    {8663842590352697437u, 7294899422760201126u, 237233663393u},
+    {17093523026636671168u, 2047461597291187207u, 161395457290u},
+    {839764004742743203u, 10942374468813517900u, 10110993115u},
+    {16894643909298232323u, 10364795403063433969u, 219593187308u},
+    {9066702926218949317u, 12330859528790939137u, 236561876684u},
+    {9119392417260546810u, 8973160144879916806u, 204668457234u},
+    {9723021096578315109u, 2895354388547509877u, 18486435986u},
+    {14787464248751217597u, 16766844772497556429u, 146156957475u},
+    {3733434565920249133u, 7442407174620948827u, 35908932476u},
+    {6643788868836820841u, 6683013428676659077u, 124403453701u},
+    {4729646697422664063u, 16713703375071907588u, 5362286883u},
+    {4090144564201555829u, 8791044883080637861u, 35906051675u},
+    {2109480737093400002u, 602844107089214413u, 91476563498u},
+    {16577155033369419739u, 9754832281172880875u, 42032680244u},
+    {745377248603805917u, 10587846778003503903u, 52528810517u},
+    {11305561465807999667u, 17206244172922947013u, 21573968323u},
+    {2211245518782892177u, 11620628420699303875u, 195932752365u},
+    {14170095199249735666u, 17864732368219338611u, 237629955528u},
+    {17849973668116118927u, 4146383014621345887u, 200968449082u},
+    {9020960204585720001u, 11445705075042688243u, 58224775873u},
+    {10807134002871850916u, 7369147888966546592u, 193620472915u},
+    {3925122626254791201u, 9762476865090597796u, 83399482307u},
+    {17208463291312718997u, 5507001428194242827u, 195529224931u},
+    {5145077219589447653u, 11371471148365328344u, 227298535145u},
+    {17602397765035489468u, 3148788104946538618u, 233616448686u},
+    {16422643262490753377u, 3762722308424507574u, 174170696145u},
+    {2902509461400906224u, 1156171244825745915u, 209203977585u},
+    {3422418805967265206u, 14208921674868257865u, 113062676168u},
+    {4228874576277237392u, 7903080886897905503u, 200770267187u},
+    {2553488530807495751u, 6367240794154270982u, 51428426873u},
+    {11546099176912486413u, 1623672396662369850u, 121345168815u},
+    {10460791037534167991u, 18323231215381674394u, 175088019456u},
+    {8127117908566000904u, 9842279843006544554u, 993304354u},
+    {11541304458088287306u, 7376839231308610600u, 34533551059u},
+    {6249718665174839700u, 609751749293657672u, 211399899256u},
+    {13102508413386290995u, 10386457966860989799u, 120033054708u},
+    {6274675218640661911u, 11160336020836149780u, 244563051014u},
+    {3404497118599817167u, 17947559933847409193u, 6605003027u},
+    {11258566093988562335u, 10229787001712704590u, 19972939173u},
+    {16762592482501635397u, 10441677090043619866u, 165554557864u},
+    {5550125446725071998u, 4996681336392922375u, 168566044449u},
+    {6370033225258510318u, 124497102381021895u, 33270870638u},
+    {1503521728674735398u, 8180812057779384577u, 110006749001u},
+    {4250415082606384364u, 5294232873532946716u, 73443482710u},
+    {6020091901030562974u, 2885620189169448039u, 86287000939u},
+    {16288222967151527138u, 16662526875008170507u, 107156429783u},
+    {6377016228656203782u, 15663095032402672480u, 215903277391u},
+    {8378856515587563750u, 1824281504410546614u, 79849098083u},
+    {15812881490200838483u, 9506565509584809953u, 99098894498u},
+    {4548570371183413652u, 16941136942345070055u, 162515351948u},
+    {16731431495283420383u, 15924115693705937725u, 140918380873u},
+    {14737727629551135532u, 9247807690406628462u, 73863248041u},
+    {12413722258104293893u, 7993916633864834871u, 169501324659u},
+    {800899742400762438u, 1018504409177639408u, 115433351089u},
+    {603197008376033550u, 12097800686634130718u, 177055213234u},
+    {6380777281587743935u, 6221488888422637551u, 178655823089u},
+    {10001440249018225388u, 8229322865256080421u, 241337267588u},
+    {5505914461980436708u, 7927745108183101786u, 132446112486u},
+    {1105464290051876864u, 8488683721235326653u, 230429763923u},
+    {4500443576769970176u, 11165516518170922283u, 83460172466u},
+    {2843045143185981440u, 5463648141113596927u, 178605283863u},
+    {660949699682893824u, 3958440403860778042u, 23296184959u},
+    {276549164618219520u, 5091534813990256011u, 127214587484u},
+    {4683743612465315840u, 6100166970623291280u, 92276012655u},
+    {0u, 1913011027739012426u, 111330690714u},
+    {0u, 11310957650604221440u, 154103704535u},
+    {0u, 16303817257009020928u, 215613168242u},
+    {0u, 9090406322154766336u, 114883831704u},
+    {0u, 3003279315069566976u, 152492791914u},
+    {0u, 16582887146675765248u, 106162808097u},
+    {0u, 9691746398101307392u, 33898960113u},
+    {0u, 0u, 241525390625u},
+    {0u, 0u, 33000000000u},
+};
+
+#endif // LLVM_LIBC_SRC___SUPPORT_RYU_CONSTANTS_H
diff --git a/contrib/llvm-project/libc/src/__support/ryu_long_double_constants.h b/contrib/llvm-project/libc/src/__support/ryu_long_double_constants.h
new file mode 100644
index 000000000000..8ebb29727789
--- /dev/null
+++ b/contrib/llvm-project/libc/src/__support/ryu_long_double_constants.h
@@ -0,0 +1,120478 @@
+//===-- Ryu Constants for long double conversion ----------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_RYU_LONG_DOUBLE_CONSTANTS_H
+#define LLVM_LIBC_SRC___SUPPORT_RYU_LONG_DOUBLE_CONSTANTS_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+constexpr size_t TABLE_SHIFT_CONST = 120;
+constexpr size_t IDX_SIZE = 128;
+
+constexpr size_t MID_INT_SIZE = (256 + 64);
+
+constexpr uint32_t POW10_OFFSET[] = {
+    0,     4,     13,    26,    43,    64,    90,    120,   154,   193,   236,
+    283,   334,   390,   450,   514,   582,   655,   732,   813,   899,   989,
+    1083,  1181,  1284,  1391,  1502,  1618,  1738,  1862,  1990,  2123,  2260,
+    2401,  2547,  2697,  2851,  3009,  3172,  3339,  3510,  3686,  3866,  4050,
+    4238,  4431,  4628,  4829,  5034,  5244,  5458,  5676,  5899,  6126,  6357,
+    6592,  6832,  7076,  7324,  7577,  7834,  8095,  8360,  8630,  8904,  9182,
+    9465,  9752,  10043, 10338, 10638, 10942, 11250, 11563, 11880, 12201, 12526,
+    12856, 13190, 13528, 13871, 14218, 14569, 14924, 15284, 15648, 16016, 16388,
+    16765, 17146, 17531, 17921, 18315, 18713, 19115, 19522, 19933, 20348, 20768,
+    21192, 21620, 22052, 22489, 22930, 23375, 23825, 24279, 24737, 25199, 25666,
+    26137, 26612, 27092, 27576, 28064, 28556, 29053, 29554, 30059, 30568, 31082,
+    31600, 32122, 32649, 33180, 33715, 34254, 34798, 35346};
+
+constexpr uint32_t POW10_OFFSET_2[130] = {
+    0,     15,    44,    83,    131,   190,   259,   338,   426,   524,   633,
+    751,   879,   1017,  1166,  1324,  1492,  1670,  1858,  2056,  2264,  2482,
+    2709,  2947,  3195,  3453,  3720,  3997,  4285,  4582,  4889,  5206,  5534,
+    5871,  6218,  6575,  6941,  7318,  7705,  8102,  8508,  8925,  9352,  9788,
+    10234, 10690, 11157, 11633, 12119, 12615, 13122, 13638, 14164, 14700, 15245,
+    15801, 16367, 16943, 17528, 18124, 18730, 19345, 19970, 20605, 21251, 21906,
+    22571, 23246, 23931, 24626, 25331, 26046, 26770, 27505, 28250, 29004, 29768,
+    30543, 31328, 32122, 32926, 33740, 34565, 35399, 36243, 37097, 37961, 38835,
+    39719, 40613, 41516, 42430, 43354, 44287, 45230, 46184, 47148, 48121, 49104,
+    50097, 51100, 52113, 53136, 54169, 55212, 56265, 57328, 58400, 59482, 60575,
+    61678, 62790, 63912, 65045, 66188, 67340, 68502, 69674, 70856, 72048, 73250,
+    74462, 75684, 76916, 78158, 79409, 80670, 81942, 83224, 84515};
+
+constexpr uint16_t MIN_BLOCK_2[130] = {
+    0,   0,   4,   9,   13,  17,  21,  26,  30,  34,  39,  43,  47,  51,  56,
+    60,  64,  68,  73,  77,  81,  86,  90,  94,  98,  103, 107, 111, 116, 120,
+    124, 128, 133, 137, 141, 146, 150, 154, 158, 163, 167, 171, 176, 180, 184,
+    188, 193, 197, 201, 205, 210, 214, 218, 223, 227, 231, 235, 240, 244, 248,
+    253, 257, 261, 265, 270, 274, 278, 283, 287, 291, 295, 300, 304, 308, 313,
+    317, 321, 325, 330, 334, 338, 342, 347, 351, 355, 360, 364, 368, 372, 377,
+    381, 385, 390, 394, 398, 402, 407, 411, 415, 420, 424, 428, 432, 437, 441,
+    445, 450, 454, 458, 462, 467, 471, 475, 479, 484, 488, 492, 497, 501, 505,
+    509, 514, 518, 522, 527, 531, 535, 539, 544, 0};
+
+constexpr uint64_t POW10_SPLIT[][5] = {
+    {1u, 72057594037927936u, 0u, 0u, 0u},
+    {699646928636035157u, 72057594u, 0u, 0u, 0u},
+    {1329227995784915873u, 0u, 0u, 0u, 0u},
+    {1329227996u, 0u, 0u, 0u, 0u},
+    {1u, 0u, 0u, 72057594037927936u, 0u},
+    {17296309485351745867u, 5171444645924616994u, 699646928636035156u, 72057594u, 0u},
+    {16598859101615853088u, 16672297533003297785u, 1329227995784915872u, 0u, 0u},
+    {7469952526870444257u, 14479142226848862514u, 1329227995u, 0u, 0u},
+    {13531654022114669524u, 6073184580144670117u, 1u, 0u, 0u},
+    {15757609704383306943u, 24519928653u, 0u, 0u, 0u},
+    {9590990814237149590u, 24u, 0u, 0u, 0u},
+    {452312848584u, 0u, 0u, 0u, 0u},
+    {453u, 0u, 0u, 0u, 0u},
+    {1u, 0u, 0u, 0u, 3000826u},
+    {3609144142396852269u, 16798760952716600047u, 17296309485351745866u, 5171444645924616994u, 1463310u},
+    {11568848377382068865u, 2419982808370854966u, 16598859101615853087u, 16672297533003297785u, 3665872u},
+    {10068303578029323957u, 2922947087773078955u, 7469952526870444256u, 14479142226848862514u, 1102995u},
+    {11645070846862630231u, 15419220167069510189u, 13531654022114669523u, 6073184580144670117u, 1u},
+    {12449386705878485055u, 3452124642157173415u, 15757609704383306942u, 24519928653u, 0u},
+    {15025619323517318418u, 5979700067267186898u, 9590990814237149589u, 24u, 0u},
+    {14996237555047131272u, 4913998146922579596u, 452312848583u, 0u, 0u},
+    {10211005638256058413u, 5771037749337678923u, 452u, 0u, 0u},
+    {1014743503555840530u, 8343699359066u, 0u, 0u, 0u},
+    {12900897707145290678u, 8343u, 0u, 0u, 0u},
+    {153914086704666u, 0u, 0u, 0u, 0u},
+    {153915u, 0u, 0u, 0u, 0u},
+    {1u, 0u, 0u, 0u, 506406u},
+    {9917186842884466953u, 16428432973129962469u, 3609144142396852268u, 16798760952716600047u, 2281280u},
+    {4751011869809829335u, 3721112279790863773u, 11568848377382068864u, 2419982808370854966u, 2203279u},
+    {11068497969931435029u, 18032764903259620752u, 10068303578029323956u, 2922947087773078955u, 3846350u},
+    {17118056985122509954u, 18058455550468776078u, 11645070846862630230u, 15419220167069510189u, 3546301u},
+    {14607066080907684459u, 15692090139033993189u, 12449386705878485054u, 3452124642157173415u, 3847690u},
+    {11768892370493391107u, 389416944300619392u, 15025619323517318417u, 5979700067267186898u, 763373u},
+    {4043396447647747170u, 12009691357260487292u, 14996237555047131271u, 4913998146922579596u, 348583u},
+    {1670341095362518057u, 13494259174449809899u, 10211005638256058412u, 5771037749337678923u, 452u},
+    {3190817644167043165u, 18288583400616279876u, 1014743503555840529u, 8343699359066u, 0u},
+    {10425820027224322486u, 7216107869057471u, 12900897707145290677u, 8343u, 0u},
+    {13139964660506311565u, 17237061291959073877u, 153914086704665u, 0u, 0u},
+    {2297772885416059937u, 1599418782488783272u, 153914u, 0u, 0u},
+    {7677687919964523763u, 2839213766779714u, 0u, 0u, 0u},
+    {14144589152747892828u, 2839213u, 0u, 0u, 0u},
+    {52374249726338270u, 0u, 0u, 0u, 0u},
+    {52374250u, 0u, 0u, 0u, 0u},
+    {1u, 0u, 0u, 0u, 3868386u},
+    {3757709791947931308u, 8142946531605512549u, 9917186842884466952u, 16428432973129962469u, 2503150u},
+    {3452755398462519465u, 5328402096432654514u, 4751011869809829334u, 3721112279790863773u, 995644u},
+    {3105818720159874523u, 1932004361303814511u, 11068497969931435028u, 18032764903259620752u, 2388336u},
+    {16859138458894499364u, 2511477647985517770u, 17118056985122509953u, 18058455550468776078u, 3013660u},
+    {12271894740606233755u, 17451375493324716693u, 14607066080907684458u, 15692090139033993189u, 1579084u},
+    {5429638071845793701u, 9489266854478998488u, 11768892370493391106u, 389416944300619392u, 2609173u},
+    {145278150038876889u, 8803053132063235168u, 4043396447647747169u, 12009691357260487292u, 1056505u},
+    {9050266019724932450u, 16198682197142616772u, 1670341095362518056u, 13494259174449809899u, 3144842u},
+    {11907016253451490866u, 13696242485403414201u, 3190817644167043164u, 18288583400616279876u, 391185u},
+    {2472757296513770735u, 16409082426079859930u, 10425820027224322485u, 7216107869057471u, 829215u},
+    {10558733798178239360u, 11653410736879597609u, 13139964660506311564u, 17237061291959073877u, 767165u},
+    {15917322570831255850u, 13589514120653213260u, 2297772885416059936u, 1599418782488783272u, 153914u},
+    {12254334656791355238u, 8032934885905905773u, 7677687919964523762u, 2839213766779714u, 0u},
+    {7869542424662730262u, 2753021350129449272u, 14144589152747892827u, 2839213u, 0u},
+    {1378558986933000253u, 16974897459201404132u, 52374249726338269u, 0u, 0u},
+    {13521405041909411105u, 13398576176159101588u, 52374249u, 0u, 0u},
+    {3206744593298092012u, 966134380754314586u, 0u, 0u, 0u},
+    {13914648122214918505u, 966134380u, 0u, 0u, 0u},
+    {17822033662586700073u, 0u, 0u, 0u, 0u},
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