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4cca6b86 UD |
1 | /* Find first set bit in a word, counted from least significant end. |
2 | For PowerPC. | |
d4697bc9 | 3 | Copyright (C) 1991-2014 Free Software Foundation, Inc. |
41bdb6e2 | 4 | This file is part of the GNU C Library. |
4cca6b86 UD |
5 | Contributed by Torbjorn Granlund (tege@sics.se). |
6 | ||
7 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
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. | |
4cca6b86 UD |
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 | |
41bdb6e2 | 15 | Lesser General Public License for more details. |
4cca6b86 | 16 | |
41bdb6e2 | 17 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
18 | License along with the GNU C Library; if not, see |
19 | <http://www.gnu.org/licenses/>. */ | |
4cca6b86 | 20 | |
cdb47f09 | 21 | #define ffsl __something_else |
4e73e115 | 22 | #include <limits.h> |
1f205a47 | 23 | #include <string.h> |
4cca6b86 | 24 | |
cdb47f09 UD |
25 | #undef ffs |
26 | ||
27 | #ifdef __GNUC__ | |
28 | ||
4cca6b86 | 29 | int |
19212f87 | 30 | __ffs (int x) |
4cca6b86 UD |
31 | { |
32 | int cnt; | |
33 | ||
34 | asm ("cntlzw %0,%1" : "=r" (cnt) : "r" (x & -x)); | |
35 | return 32 - cnt; | |
36 | } | |
19212f87 | 37 | weak_alias (__ffs, ffs) |
5bb43a43 | 38 | libc_hidden_def (__ffs) |
2dd18ce2 | 39 | libc_hidden_builtin_def (ffs) |
4e73e115 | 40 | #if ULONG_MAX == UINT_MAX |
cdb47f09 UD |
41 | #undef ffsl |
42 | weak_alias (__ffs, ffsl) | |
4e73e115 | 43 | #endif |
cdb47f09 UD |
44 | |
45 | #else | |
2826ac7e | 46 | #include <string/ffs.c> |
cdb47f09 | 47 | #endif |