1 /* Find first set bit in a word, counted from least significant end.
3 Copyright (C) 1991-2022 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
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.
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.
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/>. */
20 #define ffsl __something_else
33 asm ("cntlzw %0,%1" : "=r" (cnt
) : "r" (x
& -x
));
36 weak_alias (__ffs
, ffs
)
37 libc_hidden_def (__ffs
)
38 libc_hidden_builtin_def (ffs
)
39 #if ULONG_MAX == UINT_MAX
41 weak_alias (__ffs
, ffsl
)
45 #include <string/ffs.c>