1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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#define bswap_16 bswap_16
32static av_always_inline av_const uint16_t bswap_16(uint16_t x)
33{
34    __asm__("rorw $8, %0" : "+r"(x));
35    return x;
36}
37
38#define bswap_32 bswap_32
39static av_always_inline av_const uint32_t bswap_32(uint32_t x)
40{
41#if HAVE_BSWAP
42    __asm__("bswap   %0" : "+r" (x));
43#else
44    __asm__("rorw    $8,  %w0 \n\t"
45            "rorl    $16, %0  \n\t"
46            "rorw    $8,  %w0"
47            : "+r"(x));
48#endif
49    return x;
50}
51
52#if ARCH_X86_64
53#define bswap_64 bswap_64
54static inline uint64_t av_const bswap_64(uint64_t x)
55{
56    __asm__("bswap  %0": "=r" (x) : "0" (x));
57    return x;
58}
59#endif
60
61#endif /* AVUTIL_X86_BSWAP_H */
62