| Inna Palant | ff3f07a | 2019-07-11 16:15:26 -0700 | [diff] [blame] | 1 | /* ===-- ffssi2.c - Implement __ffssi2 -------------------------------------=== |
| 2 | * |
| 3 | * The LLVM Compiler Infrastructure |
| 4 | * |
| 5 | * This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | * Source Licenses. See LICENSE.TXT for details. |
| 7 | * |
| 8 | * ===----------------------------------------------------------------------=== |
| 9 | * |
| 10 | * This file implements __ffssi2 for the compiler_rt library. |
| 11 | * |
| 12 | * ===----------------------------------------------------------------------=== |
| 13 | */ |
| 14 | |
| 15 | #include "int_lib.h" |
| 16 | |
| 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. |
| 19 | */ |
| 20 | |
| 21 | COMPILER_RT_ABI si_int |
| 22 | __ffssi2(si_int a) |
| 23 | { |
| 24 | if (a == 0) |
| 25 | { |
| 26 | return 0; |
| 27 | } |
| 28 | return __builtin_ctz(a) + 1; |
| 29 | } |
