1 files changed, 31 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/ffsti2.c b/contrib/llvm-project/compiler-rt/lib/builtins/ffsti2.c
new file mode 100644
index 000000000000..a2177d148a09
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/ffsti2.c
@@ -0,0 +1,31 @@
+//===-- ffsti2.c - Implement __ffsti2 -------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache 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 __ffsti2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+#ifdef CRT_HAS_128BIT
+
+// Returns: the index of the least significant 1-bit in a, or
+// the value zero if a is zero. The least significant bit is index one.
+
+COMPILER_RT_ABI int __ffsti2(ti_int a) {
+  twords x;
+  x.all = a;
+  if (x.s.low == 0) {
+    if (x.s.high == 0)
+      return 0;
+    return __builtin_ctzll(x.s.high) + (1 + sizeof(di_int) * CHAR_BIT);
+  }
+  return __builtin_ctzll(x.s.low) + 1;
+}
+
+#endif // CRT_HAS_128BIT