Differential D10086 Diff 26998 contrib/compiler-rt/lib/builtins/ffssi2.c

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				/* ===-- ffssi2.c - Implement __ffssi2 -------------------------------------===
				*
				* The LLVM Compiler Infrastructure
				*
				* This file is dual licensed under the MIT and the University of Illinois Open
				* Source Licenses. See LICENSE.TXT for details.
				*
				* ===----------------------------------------------------------------------===
				*
				* 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;
				}