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Diffstat (limited to 'compiler-rt/lib/builtins/ffssi2.c')
-rw-r--r-- | compiler-rt/lib/builtins/ffssi2.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/compiler-rt/lib/builtins/ffssi2.c b/compiler-rt/lib/builtins/ffssi2.c new file mode 100644 index 000000000000..cba1f72fdc61 --- /dev/null +++ b/compiler-rt/lib/builtins/ffssi2.c @@ -0,0 +1,23 @@ +//===-- ffssi2.c - Implement __ffssi2 -------------------------------------===// +// +// Part of the LLVM Project, under the Apache 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 __ffssi2 for the compiler_rt library. +// +//===----------------------------------------------------------------------===// + +#include "int_lib.h" + +// 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 si_int __ffssi2(si_int a) { + if (a == 0) { + return 0; + } + return __builtin_ctz(a) + 1; +} |