add missing #includes
[libav.git] / libavutil / 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_64
14 # define LEGACY_REGS "=Q"
15 #else
16 # define LEGACY_REGS "=q"
17 #endif
18
19 #if defined(ARCH_X86) || defined(ARCH_X86_64)
20 static always_inline uint16_t bswap_16(uint16_t x)
21 {
22 __asm("rorw $8, %0" :
23 LEGACY_REGS (x) :
24 "0" (x));
25 return x;
26 }
27
28 static always_inline uint32_t bswap_32(uint32_t x)
29 {
30 #if __CPU__ > 386
31 __asm("bswap %0":
32 "=r" (x) :
33 #else
34 __asm("xchgb %b0,%h0\n"
35 " rorl $16,%0\n"
36 " xchgb %b0,%h0":
37 LEGACY_REGS (x) :
38 #endif
39 "0" (x));
40 return x;
41 }
42
43 static inline uint64_t bswap_64(uint64_t x)
44 {
45 #ifdef ARCH_X86_64
46 __asm("bswap %0":
47 "=r" (x) :
48 "0" (x));
49 return x;
50 #else
51 union {
52 uint64_t ll;
53 struct {
54 uint32_t l,h;
55 } l;
56 } r;
57 r.l.l = bswap_32 (x);
58 r.l.h = bswap_32 (x>>32);
59 return r.ll;
60 #endif
61 }
62
63 #elif defined(ARCH_SH4)
64
65 static always_inline uint16_t bswap_16(uint16_t x) {
66 __asm__("swap.b %0,%0":"=r"(x):"0"(x));
67 return x;
68 }
69
70 static always_inline uint32_t bswap_32(uint32_t x) {
71 __asm__(
72 "swap.b %0,%0\n"
73 "swap.w %0,%0\n"
74 "swap.b %0,%0\n"
75 :"=r"(x):"0"(x));
76 return x;
77 }
78
79 static inline uint64_t bswap_64(uint64_t x)
80 {
81 union {
82 uint64_t ll;
83 struct {
84 uint32_t l,h;
85 } l;
86 } r;
87 r.l.l = bswap_32 (x);
88 r.l.h = bswap_32 (x>>32);
89 return r.ll;
90 }
91 #else
92
93 static always_inline uint16_t bswap_16(uint16_t x){
94 return (x>>8) | (x<<8);
95 }
96
97 #ifdef ARCH_ARM
98 static always_inline uint32_t bswap_32(uint32_t x){
99 uint32_t t;
100 __asm__ (
101 "eor %1, %0, %0, ror #16 \n\t"
102 "bic %1, %1, #0xFF0000 \n\t"
103 "mov %0, %0, ror #8 \n\t"
104 "eor %0, %0, %1, lsr #8 \n\t"
105 : "+r"(x), "+r"(t));
106 return x;
107 }
108 #else
109 static always_inline uint32_t bswap_32(uint32_t x){
110 x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
111 return (x>>16) | (x<<16);
112 }
113 #endif
114
115 static inline uint64_t bswap_64(uint64_t x)
116 {
117 #if 0
118 x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL);
119 x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL);
120 return (x>>32) | (x<<32);
121 #else
122 union {
123 uint64_t ll;
124 uint32_t l[2];
125 } w, r;
126 w.ll = x;
127 r.l[0] = bswap_32 (w.l[1]);
128 r.l[1] = bswap_32 (w.l[0]);
129 return r.ll;
130 #endif
131 }
132 #endif /* !ARCH_X86 */
133
134 #endif /* !HAVE_BYTESWAP_H */
135
136 // be2me ... BigEndian to MachineEndian
137 // le2me ... LittleEndian to MachineEndian
138
139 #ifdef WORDS_BIGENDIAN
140 #define be2me_16(x) (x)
141 #define be2me_32(x) (x)
142 #define be2me_64(x) (x)
143 #define le2me_16(x) bswap_16(x)
144 #define le2me_32(x) bswap_32(x)
145 #define le2me_64(x) bswap_64(x)
146 #else
147 #define be2me_16(x) bswap_16(x)
148 #define be2me_32(x) bswap_32(x)
149 #define be2me_64(x) bswap_64(x)
150 #define le2me_16(x) (x)
151 #define le2me_32(x) (x)
152 #define le2me_64(x) (x)
153 #endif
154
155 #endif /* __BSWAP_H__ */