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
28int
29__ffs (int x)
30{
31 int cnt;
32
33 asm ("cntlzw %0,%1" : "=r" (cnt) : "r" (x & -x));
34 return 32 - cnt;
35}
36weak_alias (__ffs, ffs)
37libc_hidden_def (__ffs)
38libc_hidden_builtin_def (ffs)
39#if ULONG_MAX == UINT_MAX
40#undef ffsl
41weak_alias (__ffs, ffsl)
42#endif
43
44#else
45#include <string/ffs.c>
46#endif
47

source code of glibc/sysdeps/powerpc/ffs.c