1  /* ffsll.c -- version of ffsll for gold.  */
       2  
       3  /* Copyright (C) 2009-2023 Free Software Foundation, Inc.
       4     Written by Ian Lance Taylor <iant@google.com>.
       5  
       6     This file is part of gold.
       7  
       8     This program is free software; you can redistribute it and/or modify
       9     it under the terms of the GNU General Public License as published by
      10     the Free Software Foundation; either version 3 of the License, or
      11     (at your option) any later version.
      12  
      13     This program is distributed in the hope that it will be useful,
      14     but WITHOUT ANY WARRANTY; without even the implied warranty of
      15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      16     GNU General Public License for more details.
      17  
      18     You should have received a copy of the GNU General Public License
      19     along with this program; if not, write to the Free Software
      20     Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
      21     MA 02110-1301, USA.  */
      22  
      23  #include "config.h"
      24  
      25  #include <string.h>
      26  
      27  extern int ffsll (long long);
      28  
      29  /* This file implements ffsll for systems which don't have it.  We use
      30     ffsll if possible because gcc supports it as a builtin which will
      31     use a machine instruction if there is one.  */
      32  
      33  int
      34  ffsll (long long arg)
      35  {
      36    unsigned long long i;
      37    int ret;
      38  
      39    if (arg == 0)
      40      ret = 0;
      41    else
      42      {
      43        ret = 1;
      44        for (i = (unsigned long long) arg; (i & 1) == 0; i >>= 1)
      45  	++ret;
      46      }
      47    return ret;
      48  }