1 | /* Find first set bit in a word, counted from least significant end. |
2 | For PowerPC. |
3 | Copyright (C) 1991-2022 Free Software Foundation, Inc. |
4 | This file is part of the GNU C Library. |
5 | |
6 | The GNU C Library is free software; you can redistribute it and/or |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either |
9 | version 2.1 of the License, or (at your option) any later version. |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | Lesser General Public License for more details. |
15 | |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, see |
18 | <https://www.gnu.org/licenses/>. */ |
19 | |
20 | #define ffsl __something_else |
21 | #include <limits.h> |
22 | #include <string.h> |
23 | |
24 | #undef ffs |
25 | |
26 | #ifdef __GNUC__ |
27 | |
28 | int |
29 | __ffs (int x) |
30 | { |
31 | int cnt; |
32 | |
33 | asm ("cntlzw %0,%1" : "=r" (cnt) : "r" (x & -x)); |
34 | return 32 - cnt; |
35 | } |
36 | weak_alias (__ffs, ffs) |
37 | libc_hidden_def (__ffs) |
38 | libc_hidden_builtin_def (ffs) |
39 | #if ULONG_MAX == UINT_MAX |
40 | #undef ffsl |
41 | weak_alias (__ffs, ffsl) |
42 | #endif |
43 | |
44 | #else |
45 | #include <string/ffs.c> |
46 | #endif |
47 | |