mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-22 10:50:07 +00:00
41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/* ffs -- find first set bit in a word, counted from least significant end.
|
|
For Intel 80x86, x>=3.
|
|
This file is part of the GNU C Library.
|
|
Copyright (C) 1991, 92, 93, 94, 97, 98 Free Software Foundation, Inc.
|
|
Contributed by Torbjorn Granlund (tege@sics.se).
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#define ffsl __something_else
|
|
#include <string.h>
|
|
|
|
#undef ffs
|
|
|
|
#ifdef __GNUC__
|
|
|
|
int
|
|
__ffs (x)
|
|
int x;
|
|
{
|
|
int cnt;
|
|
int tmp;
|
|
|
|
asm ("xorl %0,%0\n" /* Set CNT to zero. */
|
|
"bsfl %2,%1\n" /* Count low bits in X and store in %1. */
|
|
"jz 1f\n" /* Jump if OK, i.e. X was non-zero. */
|
|
"leal 1(%1),%0\n" /* Return bsfl-result plus one on %0. */
|
|
"1:" : "=&a" (cnt), "=r" (tmp) : "rm" (x));
|
|
|
|
return cnt;
|
|
}
|
|
weak_alias (__ffs, ffs)
|
|
#undef ffsl
|
|
weak_alias (__ffs, ffsl)
|
|
|
|
#else
|
|
#include <sysdeps/generic/ffs.c>
|
|
#endif
|