Reapply r12489: Add pure, const and malloc attributes to proper functions
[libav.git] / libavutil / bswap.h
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1/*
2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3 *
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4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
b78e7197 9 * version 2.1 of the License, or (at your option) any later version.
04d7f601 10 *
b78e7197 11 * FFmpeg is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
b78e7197 17 * License along with FFmpeg; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
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21/**
22 * @file bswap.h
7ce68923 23 * byte swapping routines
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24 */
25
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26#ifndef FFMPEG_BSWAP_H
27#define FFMPEG_BSWAP_H
a9b3f630 28
99545457 29#include <stdint.h>
a087028a 30#include "config.h"
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31#include "common.h"
32
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33#ifdef HAVE_BYTESWAP_H
34#include <byteswap.h>
35#else
36
85074d3c 37static av_always_inline av_const uint16_t bswap_16(uint16_t x)
a9b3f630 38{
bf5d7db5 39#if defined(ARCH_X86)
3662d880 40 asm("rorw $8, %0" : "+r"(x));
bf5d7db5 41#elif defined(ARCH_SH4)
70fa2e27 42 asm("swap.b %0,%0" : "=r"(x) : "0"(x));
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43#else
44 x= (x>>8) | (x<<8);
45#endif
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46 return x;
47}
a9b3f630 48
85074d3c 49static av_always_inline av_const uint32_t bswap_32(uint32_t x)
a9b3f630 50{
bf5d7db5 51#if defined(ARCH_X86)
6bd859d6 52#ifdef HAVE_BSWAP
3662d880 53 asm("bswap %0" : "+r" (x));
a9b3f630 54#else
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55 asm("rorw $8, %w0 \n\t"
56 "rorl $16, %0 \n\t"
57 "rorw $8, %w0"
58 : "+r"(x));
a9b3f630 59#endif
0c6bd2ea 60#elif defined(ARCH_SH4)
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61 asm("swap.b %0,%0\n"
62 "swap.w %0,%0\n"
63 "swap.b %0,%0\n"
64 : "=r"(x) : "0"(x));
bf5d7db5 65#elif defined(ARCH_ARM)
6ad1fa5a 66 uint32_t t;
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67 asm ("eor %1, %0, %0, ror #16 \n\t"
68 "bic %1, %1, #0xFF0000 \n\t"
69 "mov %0, %0, ror #8 \n\t"
70 "eor %0, %0, %1, lsr #8 \n\t"
71 : "+r"(x), "+r"(t));
20d45dc2 72#elif defined(ARCH_BFIN)
20d45dc2 73 unsigned tmp;
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74 asm("%1 = %0 >> 8 (V); \n\t"
75 "%0 = %0 << 8 (V); \n\t"
76 "%0 = %0 | %1; \n\t"
77 "%0 = PACK(%0.L, %0.H); \n\t"
20d45dc2 78 : "+d"(x), "=&d"(tmp));
6ad1fa5a 79#else
33f72572 80 x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
853d15c2 81 x= (x>>16) | (x<<16);
bf5d7db5 82#endif
853d15c2 83 return x;
24dea064 84}
a9b3f630 85
85074d3c 86static inline uint64_t av_const bswap_64(uint64_t x)
74fc9989 87{
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88#if 0
89 x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL);
90 x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL);
91 return (x>>32) | (x<<32);
bf5d7db5 92#elif defined(ARCH_X86_64)
70fa2e27 93 asm("bswap %0": "=r" (x) : "0" (x));
bf5d7db5 94 return x;
33f72572 95#else
115329f1 96 union {
74fc9989 97 uint64_t ll;
115329f1 98 uint32_t l[2];
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99 } w, r;
100 w.ll = x;
101 r.l[0] = bswap_32 (w.l[1]);
102 r.l[1] = bswap_32 (w.l[0]);
103 return r.ll;
33f72572 104#endif
74fc9989 105}
a9b3f630 106
bb270c08 107#endif /* !HAVE_BYTESWAP_H */
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108
109// be2me ... BigEndian to MachineEndian
110// le2me ... LittleEndian to MachineEndian
111
112#ifdef WORDS_BIGENDIAN
113#define be2me_16(x) (x)
114#define be2me_32(x) (x)
115#define be2me_64(x) (x)
116#define le2me_16(x) bswap_16(x)
117#define le2me_32(x) bswap_32(x)
118#define le2me_64(x) bswap_64(x)
119#else
120#define be2me_16(x) bswap_16(x)
121#define be2me_32(x) bswap_32(x)
122#define be2me_64(x) bswap_64(x)
123#define le2me_16(x) (x)
124#define le2me_32(x) (x)
125#define le2me_64(x) (x)
126#endif
127
5b21bdab 128#endif /* FFMPEG_BSWAP_H */