1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* byte swapping routines
*/
#ifndef AVUTIL_X86_BSWAP_H
#define AVUTIL_X86_BSWAP_H
#include <stdint.h>
#include "config.h"
#include "libavutil/attributes.h"
#if defined(_MSC_VER)
#define av_bswap16 av_bswap16
static av_always_inline av_const uint16_t av_bswap16(uint16_t x)
{
return _rotr16(x, 8);
}
#define av_bswap32 av_bswap32
static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
{
return _byteswap_ulong(x);
}
#if ARCH_X86_64
#define av_bswap64 av_bswap64
static inline uint64_t av_const av_bswap64(uint64_t x)
{
return _byteswap_uint64(x);
}
#endif
#elif HAVE_INLINE_ASM
#if AV_GCC_VERSION_AT_MOST(4,0)
#define av_bswap16 av_bswap16
static av_always_inline av_const unsigned av_bswap16(unsigned x)
{
__asm__("rorw $8, %w0" : "+r"(x));
return x;
}
#endif /* AV_GCC_VERSION_AT_MOST(4,0) */
#if AV_GCC_VERSION_AT_MOST(4,4) || defined(__INTEL_COMPILER)
#define av_bswap32 av_bswap32
static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
{
__asm__("bswap %0" : "+r" (x));
return x;
}
#if ARCH_X86_64
#define av_bswap64 av_bswap64
static inline uint64_t av_const av_bswap64(uint64_t x)
{
__asm__("bswap %0": "=r" (x) : "0" (x));
return x;
}
#endif
#endif /* AV_GCC_VERSION_AT_MOST(4,4) */
#endif /* HAVE_INLINE_ASM */
#endif /* AVUTIL_X86_BSWAP_H */
|
