1/* ffsll.c -- version of ffsll for gold.  */
2
3/* Copyright 2009 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
27extern 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
33int
34ffsll (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}
49