1 /* ===-- ffssi2.c - Implement __ffssi2 -------------------------------------===
3 * The LLVM Compiler Infrastructure
5 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. See LICENSE.TXT for details.
8 * ===----------------------------------------------------------------------===
10 * This file implements __ffssi2 for the compiler_rt library.
12 * ===----------------------------------------------------------------------===
17 /* Returns: the index of the least significant 1-bit in a, or
18 * the value zero if a is zero. The least significant bit is index one.
21 COMPILER_RT_ABI si_int
28 return __builtin_ctz(a) + 1;