1 files changed, 29 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/clzti2.c b/contrib/llvm-project/compiler-rt/lib/builtins/clzti2.c
new file mode 100644
index 000000000000..25d30119f271
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/clzti2.c
@@ -0,0 +1,29 @@
+//===-- clzti2.c - Implement __clzti2 -------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache 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 __clzti2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+#ifdef CRT_HAS_128BIT
+
+// Returns: the number of leading 0-bits
+
+// Precondition: a != 0
+
+COMPILER_RT_ABI int __clzti2(ti_int a) {
+  twords x;
+  x.all = a;
+  const di_int f = -(x.s.high == 0);
+  return __builtin_clzll((x.s.high & ~f) | (x.s.low & f)) +
+         ((si_int)f & ((si_int)(sizeof(di_int) * CHAR_BIT)));
+}
+
+#endif // CRT_HAS_128BIT