mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-17 10:30:20 +00:00
40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
|
/* ffs -- find first set bit in a word, counted from least significant end.
|
||
|
|
For IBM rs6000.
|
||
|
|
Copyright (C) 1991, 1992 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 Library General Public License as
|
||
|
|
published by the Free Software Foundation; either version 2 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
|
||
|
|
Library General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Library General Public
|
||
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
||
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
||
|
|
Cambridge, MA 02139, USA. */
|
||
|
|
|
||
|
|
#include <ansidecl.h>
|
||
|
|
#include <bstring.h>
|
||
|
|
|
||
|
|
#undef ffs
|
||
|
|
|
||
|
|
#ifdef __GNUC__
|
||
|
|
|
||
|
|
int
|
||
|
|
DEFUN(ffs, (x), int x)
|
||
|
|
{
|
||
|
|
int cnt;
|
||
|
|
|
||
|
|
asm ("cntlz %0,%1" : "=r" (cnt) : "r" (x & -x));
|
||
|
|
return 32 - cnt;
|
||
|
|
}
|
||
|
|
|
||
|
|
#else
|
||
|
|
#include <sysdeps/generic/ffs.c>
|
||
|
|
#endif
|