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[binutils.git] / gold / ffsll.c
blobb247bc30af3c0e9a06969533d543d8366890380c
1 /* ffsll.c -- version of ffsll for gold. */
3 /* Copyright 2009 Free Software Foundation, Inc.
4 Written by Ian Lance Taylor <iant@google.com>.
6 This file is part of gold.
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.
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.
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. */
23 #include "config.h"
25 #include <string.h>
27 extern int ffsll (long long);
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. */
33 int
34 ffsll (long long arg)
36 unsigned long long i;
37 int ret;
39 if (arg == 0)
40 ret = 0;
41 else
43 ret = 1;
44 for (i = (unsigned long long) arg; (i & 1) == 0; i >>= 1)
45 ++ret;
47 return ret;