1 /* ===-- ffsti2.c - Implement __ffsti2 -------------------------------------===
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 __ffsti2 for the compiler_rt library.
12 * ===----------------------------------------------------------------------===
19 /* Returns: the index of the least significant 1-bit in a, or
20 * the value zero if a is zero. The least significant bit is index one.
23 COMPILER_RT_ABI si_int
32 return __builtin_ctzll(x.s.high) + (1 + sizeof(di_int) * CHAR_BIT);
34 return __builtin_ctzll(x.s.low) + 1;
37 #endif /* CRT_HAS_128BIT */