1/*
2 * This file is part of Libav.
3 *
4 * Libav is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * Libav 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 GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19/**
20 * @file
21 * byte swapping routines
22 */
23
24#ifndef AVUTIL_X86_BSWAP_H
25#define AVUTIL_X86_BSWAP_H
26
27#include <stdint.h>
28#include "config.h"
29#include "libavutil/attributes.h"
30
31#if !AV_GCC_VERSION_AT_LEAST(4,1)
32#define av_bswap16 av_bswap16
33static av_always_inline av_const unsigned av_bswap16(unsigned x)
34{
35    __asm__("rorw $8, %w0" : "+r"(x));
36    return x;
37}
38#endif /* !AV_GCC_VERSION_AT_LEAST(4,1) */
39
40#if !AV_GCC_VERSION_AT_LEAST(4,5)
41#define av_bswap32 av_bswap32
42static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
43{
44    __asm__("bswap   %0" : "+r" (x));
45    return x;
46}
47
48#if ARCH_X86_64
49#define av_bswap64 av_bswap64
50static inline uint64_t av_const av_bswap64(uint64_t x)
51{
52    __asm__("bswap  %0": "=r" (x) : "0" (x));
53    return x;
54}
55#endif
56#endif /* !AV_GCC_VERSION_AT_LEAST(4,5) */
57
58#endif /* AVUTIL_X86_BSWAP_H */
59