ARM: change argument/return type of bswap_16() to unsigned 32-bit
[libav.git] / libavutil / arm / bswap.h
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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
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26#ifdef __ARMCC_VERSION
27
28#if HAVE_ARMV6
29#define bswap_16 bswap_16
ac73f1a8 30static av_always_inline av_const unsigned bswap_16(unsigned x)
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31{
32 __asm { rev16 x, x }
33 return x;
34}
35
36#define bswap_32 bswap_32
37static av_always_inline av_const uint32_t bswap_32(uint32_t x)
38{
39 return __rev(x);
40}
41#endif /* HAVE_ARMV6 */
42
300ad6c1 43#elif HAVE_INLINE_ASM
1e65f62e 44
b250f9c6 45#if HAVE_ARMV6
3a90480a 46#define bswap_16 bswap_16
ac73f1a8 47static av_always_inline av_const unsigned bswap_16(unsigned x)
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48{
49 __asm__("rev16 %0, %0" : "+r"(x));
50 return x;
51}
52#endif
53
54#define bswap_32 bswap_32
55static av_always_inline av_const uint32_t bswap_32(uint32_t x)
56{
b250f9c6 57#if HAVE_ARMV6
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58 __asm__("rev %0, %0" : "+r"(x));
59#else
60 uint32_t t;
61 __asm__ ("eor %1, %0, %0, ror #16 \n\t"
62 "bic %1, %1, #0xFF0000 \n\t"
63 "mov %0, %0, ror #8 \n\t"
64 "eor %0, %0, %1, lsr #8 \n\t"
65 : "+r"(x), "=&r"(t));
66#endif /* HAVE_ARMV6 */
67 return x;
68}
69
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70#endif /* __ARMCC_VERSION */
71
3a90480a 72#endif /* AVUTIL_ARM_BSWAP_H */