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#ifndef AVUTIL_ARM_BSWAP_H
20#define AVUTIL_ARM_BSWAP_H
21
22#include <stdint.h>
23#include "config.h"
24#include "libavutil/attributes.h"
25
26#ifdef __ARMCC_VERSION
27
28#if HAVE_ARMV6
29#define av_bswap16 av_bswap16
30static av_always_inline av_const unsigned av_bswap16(unsigned x)
31{
32    __asm { rev16 x, x }
33    return x;
34}
35
36#define av_bswap32 av_bswap32
37static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
38{
39    return __rev(x);
40}
41#endif /* HAVE_ARMV6 */
42
43#elif HAVE_INLINE_ASM
44
45#if HAVE_ARMV6
46#define av_bswap16 av_bswap16
47static av_always_inline av_const unsigned av_bswap16(unsigned x)
48{
49    __asm__("rev16 %0, %0" : "+r"(x));
50    return x;
51}
52#endif
53
54#if !AV_GCC_VERSION_AT_LEAST(4,5)
55#define av_bswap32 av_bswap32
56static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
57{
58#if HAVE_ARMV6
59    __asm__("rev %0, %0" : "+r"(x));
60#else
61    uint32_t t;
62    __asm__ ("eor %1, %0, %0, ror #16 \n\t"
63             "bic %1, %1, #0xFF0000   \n\t"
64             "mov %0, %0, ror #8      \n\t"
65             "eor %0, %0, %1, lsr #8  \n\t"
66             : "+r"(x), "=&r"(t));
67#endif /* HAVE_ARMV6 */
68    return x;
69}
70#endif /* !AV_GCC_VERSION_AT_LEAST(4,5) */
71
72#endif /* __ARMCC_VERSION */
73
74#endif /* AVUTIL_ARM_BSWAP_H */
75