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#ifndef AVUTIL_ARM_BSWAP_H
20#define AVUTIL_ARM_BSWAP_H
21
22#include <stdint.h>
23#include "config.h"
24#include "libavutil/common.h"
25
26#if HAVE_ARMV6
27#define bswap_16 bswap_16
28static av_always_inline av_const uint16_t bswap_16(uint16_t x)
29{
30    __asm__("rev16 %0, %0" : "+r"(x));
31    return x;
32}
33#endif
34
35#define bswap_32 bswap_32
36static av_always_inline av_const uint32_t bswap_32(uint32_t x)
37{
38#if HAVE_ARMV6
39    __asm__("rev %0, %0" : "+r"(x));
40#else
41    uint32_t t;
42    __asm__ ("eor %1, %0, %0, ror #16 \n\t"
43             "bic %1, %1, #0xFF0000   \n\t"
44             "mov %0, %0, ror #8      \n\t"
45             "eor %0, %0, %1, lsr #8  \n\t"
46             : "+r"(x), "=&r"(t));
47#endif /* HAVE_ARMV6 */
48    return x;
49}
50
51#endif /* AVUTIL_ARM_BSWAP_H */
52