Sync with mplayer's stuff
[libav.git] / bswap.h
CommitLineData
a9b3f630
NK
1#ifndef __BSWAP_H__
2#define __BSWAP_H__
3
4#ifdef HAVE_CONFIG_H
5#include "config.h"
6#endif
7
8#ifdef HAVE_BYTESWAP_H
9#include <byteswap.h>
10#else
11
12#include <inttypes.h>
13
14#ifdef ARCH_X86
15inline static unsigned short ByteSwap16(unsigned short x)
16{
17 __asm("xchgb %b0,%h0" :
18 "=q" (x) :
19 "0" (x));
20 return x;
21}
22#define bswap_16(x) ByteSwap16(x)
23
24inline static unsigned int ByteSwap32(unsigned int x)
25{
26#if __CPU__ > 386
27 __asm("bswap %0":
28 "=r" (x) :
29#else
30 __asm("xchgb %b0,%h0\n"
31 " rorl $16,%0\n"
32 " xchgb %b0,%h0":
33 "=q" (x) :
34#endif
35 "0" (x));
36 return x;
37}
38#define bswap_32(x) ByteSwap32(x)
39
40inline static unsigned long long int ByteSwap64(unsigned long long int x)
41{
42 register union { __extension__ unsigned long long int __ll;
43 unsigned long int __l[2]; } __x;
44 asm("xchgl %0,%1":
45 "=r"(__x.__l[0]),"=r"(__x.__l[1]):
46 "0"(bswap_32((unsigned long)x)),"1"(bswap_32((unsigned long)(x>>32))));
47 return __x.__ll;
48}
49#define bswap_64(x) ByteSwap64(x)
50
51#else
52
53#define bswap_16(x) (((x) & 0x00ff) << 8 | ((x) & 0xff00) >> 8)
54
55
56// code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc.
57#define bswap_32(x) \
58 ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
59 (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
60
61#define bswap_64(x) \
62 (__extension__ \
63 ({ union { __extension__ unsigned long long int __ll; \
64 unsigned long int __l[2]; } __w, __r; \
65 __w.__ll = (x); \
66 __r.__l[0] = bswap_32 (__w.__l[1]); \
67 __r.__l[1] = bswap_32 (__w.__l[0]); \
68 __r.__ll; }))
69#endif /* !ARCH_X86 */
70
71#endif /* !HAVE_BYTESWAP_H */
72
73// be2me ... BigEndian to MachineEndian
74// le2me ... LittleEndian to MachineEndian
75
76#ifdef WORDS_BIGENDIAN
77#define be2me_16(x) (x)
78#define be2me_32(x) (x)
79#define be2me_64(x) (x)
80#define le2me_16(x) bswap_16(x)
81#define le2me_32(x) bswap_32(x)
82#define le2me_64(x) bswap_64(x)
83#else
84#define be2me_16(x) bswap_16(x)
85#define be2me_32(x) bswap_32(x)
86#define be2me_64(x) bswap_64(x)
87#define le2me_16(x) (x)
88#define le2me_32(x) (x)
89#define le2me_64(x) (x)
90#endif
91
92#endif