| 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 | |
| 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 | } |