1 /* ffsl.h -- find the first set bit in a word.
2 Copyright (C) 2011 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17 /* Written by Eric Blake. */
19 /* This file is meant to be included by ffsl.c and ffsll.c, after
20 they have defined FUNC and TYPE. */
27 #if !defined FUNC || !defined TYPE
37 /* GCC has __builtin_ffs, but it is limited to int. */
43 return result + ffs ((unsigned int) j);
44 j >>= CHAR_BIT * sizeof (unsigned int);
45 result += CHAR_BIT * sizeof (unsigned int);