1/* ffs -- find first set bit in an int, from least significant end.
2   Copyright (C) 2013-2022 Free Software Foundation, Inc.
3   This file is part of the GNU C Library.
4
5   The GNU C Library is free software; you can redistribute it and/or
6   modify it under the terms of the GNU Lesser General Public
7   License as published by the Free Software Foundation; either
8   version 2.1 of the License, or (at your option) any later version.
9
10   The GNU C Library is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public
16   License along with the GNU C Library.  If not, see
17   <https://www.gnu.org/licenses/>.  */
18
19#include <sysdep.h>
20
21	.syntax unified
22	.text
23
24ENTRY (__ffs)
25	cmp	r0, #0
26	rbit	r0, r0
27	itt	ne
28	clzne	r0, r0
29	addne	r0, r0, #1
30	bx	lr
31END (__ffs)
32
33weak_alias (__ffs, ffs)
34weak_alias (__ffs, ffsl)
35libc_hidden_def (__ffs)
36libc_hidden_builtin_def (ffs)
37