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[glibc.git] / sysdeps / powerpc / ffs.c
blob01d5f743a0ac33ea76d84083da0b5630c826b752
1 /* Find first set bit in a word, counted from least significant end.
2 For PowerPC.
3 Copyright (C) 1991, 1992, 1997, 1998 Free Software Foundation, Inc.
4 Contributed by Torbjorn Granlund (tege@sics.se).
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 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 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If not,
18 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 #define ffsl __something_else
22 #include <string.h>
24 #undef ffs
26 #ifdef __GNUC__
28 int
29 __ffs (int x)
31 int cnt;
33 asm ("cntlzw %0,%1" : "=r" (cnt) : "r" (x & -x));
34 return 32 - cnt;
36 weak_alias (__ffs, ffs)
37 #undef ffsl
38 weak_alias (__ffs, ffsl)
40 #else
41 #include <sysdeps/generic/ffs.c>
42 #endif