configure: do not use character classes with awk
[libav.git] / libavutil / intmath.h
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1/*
2 * Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#ifndef AVUTIL_INTMATH_H
22#define AVUTIL_INTMATH_H
23
24#include "config.h"
25#include "common.h"
26
27#if HAVE_FAST_CLZ && AV_GCC_VERSION_AT_LEAST(3,4)
28
29#ifndef av_log2
30
31#define av_log2(x) (31 - __builtin_clz((x)|1))
32
33#ifndef av_log2_16bit
34#define av_log2_16bit av_log2
35#endif
36
37#endif /* av_log2 */
38
39#endif /* AV_GCC_VERSION_AT_LEAST(3,4) */
40
41#endif /* AVUTIL_INTMATH_H */