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[glibc.git] / sysdeps / am29k / ffs.c
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1 /* ffs -- find first set bit in a word, counted from least significant end.
2 For Amd 290x0.
3 Copyright (C) 1991, 1992, 1997 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5 Contributed by Torbjorn Granlund (tege@sics.se).
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Library General Public License as
9 published by the Free Software Foundation; either version 2 of the
10 License, or (at your option) any later version.
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
15 Library General Public License for more details.
17 You should have received a copy of the GNU Library General Public
18 License along with the GNU C Library; see the file COPYING.LIB. If not,
19 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 #include <bstring.h>
24 #undef ffs
26 #ifdef __GNUC__
28 int
29 __ffs (x)
30 int x;
32 int cnt;
34 asm ("clz %0,%1" : "=r" (cnt) : "r" (x & -x));
36 return 32 - cnt;
38 weak_alias (__ffs, ffs)
40 #else
41 #include <sysdeps/generic/ffs.c>
42 #endif