1 files changed, 65 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/floatdidf.c b/contrib/llvm-project/compiler-rt/lib/builtins/floatdidf.c
new file mode 100644
index 000000000000..6da81f7a05bf
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/floatdidf.c
@@ -0,0 +1,65 @@
+//===-- floatdidf.c - Implement __floatdidf -------------------------------===//
+//
+// Part of the LLVM Project, under the Apache 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 __floatdidf for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: convert a to a double, rounding toward even.
+
+// Assumption: double is a IEEE 64 bit floating point type
+//             di_int is a 64 bit integral type
+
+// seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm
+// mmmm
+
+#ifndef __SOFTFP__
+// Support for systems that have hardware floating-point; we'll set the inexact
+// flag as a side-effect of this computation.
+
+COMPILER_RT_ABI double __floatdidf(di_int a) {
+  static const double twop52 = 4503599627370496.0; // 0x1.0p52
+  static const double twop32 = 4294967296.0;       // 0x1.0p32
+
+  union {
+    int64_t x;
+    double d;
+  } low = {.d = twop52};
+
+  const double high = (int32_t)(a >> 32) * twop32;
+  low.x |= a & INT64_C(0x00000000ffffffff);
+
+  const double result = (high - twop52) + low.d;
+  return result;
+}
+
+#else
+// Support for systems that don't have hardware floating-point; there are no
+// flags to set, and we don't want to code-gen to an unknown soft-float
+// implementation.
+
+#define SRC_I64
+#define DST_DOUBLE
+#include "int_to_fp_impl.inc"
+
+COMPILER_RT_ABI double __floatdidf(di_int a) { return __floatXiYf__(a); }
+#endif
+
+#if defined(__ARM_EABI__)
+#if defined(COMPILER_RT_ARMHF_TARGET)
+AEABI_RTABI double __aeabi_l2d(di_int a) { return __floatdidf(a); }
+#else
+COMPILER_RT_ALIAS(__floatdidf, __aeabi_l2d)
+#endif
+#endif
+
+#if defined(__MINGW32__) && defined(__arm__)
+COMPILER_RT_ALIAS(__floatdidf, __i64tod)
+#endif