sh4 optimized idct & bswap patch by (BERO <bero at geocities dot co dot jp>)
[libav.git] / libavcodec / bswap.h
1 /**
2 * @file bswap.h
3 * byte swap.
4 */
5
6 #ifndef __BSWAP_H__
7 #define __BSWAP_H__
8
9 #ifdef HAVE_BYTESWAP_H
10 #include <byteswap.h>
11 #else
12
13 #ifdef ARCH_X86
14 inline static unsigned short ByteSwap16(unsigned short x)
15 {
16 __asm("xchgb %b0,%h0" :
17 "=q" (x) :
18 "0" (x));
19 return x;
20 }
21 #define bswap_16(x) ByteSwap16(x)
22
23 inline static unsigned int ByteSwap32(unsigned int x)
24 {
25 #if __CPU__ > 386
26 __asm("bswap %0":
27 "=r" (x) :
28 #else
29 __asm("xchgb %b0,%h0\n"
30 " rorl $16,%0\n"
31 " xchgb %b0,%h0":
32 "=q" (x) :
33 #endif
34 "0" (x));
35 return x;
36 }
37 #define bswap_32(x) ByteSwap32(x)
38
39 inline static unsigned long long int ByteSwap64(unsigned long long int x)
40 {
41 register union { __extension__ uint64_t __ll;
42 uint32_t __l[2]; } __x;
43 asm("xchgl %0,%1":
44 "=r"(__x.__l[0]),"=r"(__x.__l[1]):
45 "0"(bswap_32((unsigned long)x)),"1"(bswap_32((unsigned long)(x>>32))));
46 return __x.__ll;
47 }
48 #define bswap_64(x) ByteSwap64(x)
49
50 #elif defined(ARCH_SH4)
51
52 static inline uint16_t ByteSwap16(uint16_t x) {
53 __asm__("swap.b %0,%0":"=r"(x):"0"(x));
54 return x;
55 }
56
57 static inline uint32_t ByteSwap32(uint32_t x) {
58 __asm__(
59 "swap.b %0,%0\n"
60 "swap.w %0,%0\n"
61 "swap.b %0,%0\n"
62 :"=r"(x):"0"(x));
63 return x;
64 }
65
66 #define bswap_16(x) ByteSwap16(x)
67 #define bswap_32(x) ByteSwap32(x)
68
69 inline static uint64_t ByteSwap64(uint64_t x)
70 {
71 union {
72 uint64_t ll;
73 struct {
74 uint32_t l,h;
75 } l;
76 } r;
77 r.l.l = bswap_32 (x);
78 r.l.h = bswap_32 (x>>32);
79 return r.ll;
80 }
81 #define bswap_64(x) ByteSwap64(x)
82
83 #else
84
85 #define bswap_16(x) (((x) & 0x00ff) << 8 | ((x) & 0xff00) >> 8)
86
87
88 // code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc.
89 #define bswap_32(x) \
90 ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
91 (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
92
93 inline static uint64_t ByteSwap64(uint64_t x)
94 {
95 union {
96 uint64_t ll;
97 uint32_t l[2];
98 } w, r;
99 w.ll = x;
100 r.l[0] = bswap_32 (w.l[1]);
101 r.l[1] = bswap_32 (w.l[0]);
102 return r.ll;
103 }
104 #define bswap_64(x) ByteSwap64(x)
105
106 #endif /* !ARCH_X86 */
107
108 #endif /* !HAVE_BYTESWAP_H */
109
110 // be2me ... BigEndian to MachineEndian
111 // le2me ... LittleEndian to MachineEndian
112
113 #ifdef WORDS_BIGENDIAN
114 #define be2me_16(x) (x)
115 #define be2me_32(x) (x)
116 #define be2me_64(x) (x)
117 #define le2me_16(x) bswap_16(x)
118 #define le2me_32(x) bswap_32(x)
119 #define le2me_64(x) bswap_64(x)
120 #else
121 #define be2me_16(x) bswap_16(x)
122 #define be2me_32(x) bswap_32(x)
123 #define be2me_64(x) bswap_64(x)
124 #define le2me_16(x) (x)
125 #define le2me_32(x) (x)
126 #define le2me_64(x) (x)
127 #endif
128
129 #endif /* __BSWAP_H__ */