| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Find first set bit in a word, counted from least significant end. |
| 2 | For PowerPC. |
| 3 | Copyright (C) 1991-2015 Free Software Foundation, Inc. |
| 4 | This file is part of the GNU C Library. |
| 5 | Contributed by Torbjorn Granlund (tege@sics.se). |
| 6 | |
| 7 | The GNU C Library is free software; you can redistribute it and/or |
| 8 | modify it under the terms of the GNU Lesser General Public |
| 9 | License as published by the Free Software Foundation; either |
| 10 | version 2.1 of the License, or (at your option) any later version. |
| 11 | |
| 12 | The GNU C Library is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | Lesser General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU Lesser General Public |
| 18 | License along with the GNU C Library; if not, see |
| 19 | <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #define ffsl __something_else |
| 22 | #include <limits.h> |
| 23 | #include <string.h> |
| 24 | |
| 25 | #undef ffs |
| 26 | |
| 27 | #ifdef __GNUC__ |
| 28 | |
| 29 | int |
| 30 | __ffs (int x) |
| 31 | { |
| 32 | int cnt; |
| 33 | |
| 34 | asm ("cntlzw %0,%1" : "=r" (cnt) : "r" (x & -x)); |
| 35 | return 32 - cnt; |
| 36 | } |
| 37 | weak_alias (__ffs, ffs) |
| 38 | libc_hidden_def (__ffs) |
| 39 | libc_hidden_builtin_def (ffs) |
| 40 | #if ULONG_MAX == UINT_MAX |
| 41 | #undef ffsl |
| 42 | weak_alias (__ffs, ffsl) |
| 43 | #endif |
| 44 | |
| 45 | #else |
| 46 | #include <string/ffs.c> |
| 47 | #endif |