text: /* ffs -- find first set bit in a word, counted from least significant end.
     For AMD x86-64.
     This file is part of the GNU C Library.
     Copyright (C) 1991,92,93,94,97,98,2001,2004 Free Software Foundation, Inc.
     Contributed by Ulrich Drepper <drepper@cygnus.com>.
  
     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.  */
  
  #include <string.h>
  
  #undef	ffs
  
  int
  __ffs (int x)
  {
    int cnt;
    int tmp;
  
    asm ("bsfl %2,%0\n"		/* Count low bits in X and store in %1.  */
         "cmovel %1,%0\n"		/* If number was zero, use -1 as result.  */
         : "=&r" (cnt), "=r" (tmp) : "rm" (x), "1" (-1));
  
    return cnt + 1;
  }
  weak_alias (__ffs, ffs)
  libc_hidden_builtin_def (ffs)
  