/* 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) 1991-2018 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, see

   <http://www.gnu.org/licenses/>.  */

#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_def (__ffs)

libc_hidden_builtin_def (ffs)