Use common define for x86_32 and x86_64.
[libav.git] / libavutil / bswap.h
1 /*
2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
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
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /**
22 * @file bswap.h
23 * byte swap.
24 */
25
26 #ifndef __BSWAP_H__
27 #define __BSWAP_H__
28
29 #ifdef HAVE_BYTESWAP_H
30 #include <byteswap.h>
31 #else
32
33 #ifdef ARCH_X86_64
34 # define LEGACY_REGS "=Q"
35 #else
36 # define LEGACY_REGS "=q"
37 #endif
38
39 #if defined(ARCH_X86)
40 static always_inline uint16_t bswap_16(uint16_t x)
41 {
42 __asm("rorw $8, %0" :
43 LEGACY_REGS (x) :
44 "0" (x));
45 return x;
46 }
47
48 static always_inline uint32_t bswap_32(uint32_t x)
49 {
50 #if __CPU__ != 386
51 __asm("bswap %0":
52 "=r" (x) :
53 #else
54 __asm("xchgb %b0,%h0\n"
55 " rorl $16,%0\n"
56 " xchgb %b0,%h0":
57 LEGACY_REGS (x) :
58 #endif
59 "0" (x));
60 return x;
61 }
62
63 static inline uint64_t bswap_64(uint64_t x)
64 {
65 #ifdef ARCH_X86_64
66 __asm("bswap %0":
67 "=r" (x) :
68 "0" (x));
69 return x;
70 #else
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 #endif
81 }
82
83 #elif defined(ARCH_SH4)
84
85 static always_inline uint16_t bswap_16(uint16_t x) {
86 __asm__("swap.b %0,%0":"=r"(x):"0"(x));
87 return x;
88 }
89
90 static always_inline uint32_t bswap_32(uint32_t x) {
91 __asm__(
92 "swap.b %0,%0\n"
93 "swap.w %0,%0\n"
94 "swap.b %0,%0\n"
95 :"=r"(x):"0"(x));
96 return x;
97 }
98
99 static inline uint64_t bswap_64(uint64_t x)
100 {
101 union {
102 uint64_t ll;
103 struct {
104 uint32_t l,h;
105 } l;
106 } r;
107 r.l.l = bswap_32 (x);
108 r.l.h = bswap_32 (x>>32);
109 return r.ll;
110 }
111 #else
112
113 static always_inline uint16_t bswap_16(uint16_t x){
114 return (x>>8) | (x<<8);
115 }
116
117 #ifdef ARCH_ARM
118 static always_inline uint32_t bswap_32(uint32_t x){
119 uint32_t t;
120 __asm__ (
121 "eor %1, %0, %0, ror #16 \n\t"
122 "bic %1, %1, #0xFF0000 \n\t"
123 "mov %0, %0, ror #8 \n\t"
124 "eor %0, %0, %1, lsr #8 \n\t"
125 : "+r"(x), "+r"(t));
126 return x;
127 }
128 #else
129 static always_inline uint32_t bswap_32(uint32_t x){
130 x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
131 return (x>>16) | (x<<16);
132 }
133 #endif
134
135 static inline uint64_t bswap_64(uint64_t x)
136 {
137 #if 0
138 x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL);
139 x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL);
140 return (x>>32) | (x<<32);
141 #else
142 union {
143 uint64_t ll;
144 uint32_t l[2];
145 } w, r;
146 w.ll = x;
147 r.l[0] = bswap_32 (w.l[1]);
148 r.l[1] = bswap_32 (w.l[0]);
149 return r.ll;
150 #endif
151 }
152 #endif /* defined(ARCH_X86) */
153
154 #endif /* !HAVE_BYTESWAP_H */
155
156 // be2me ... BigEndian to MachineEndian
157 // le2me ... LittleEndian to MachineEndian
158
159 #ifdef WORDS_BIGENDIAN
160 #define be2me_16(x) (x)
161 #define be2me_32(x) (x)
162 #define be2me_64(x) (x)
163 #define le2me_16(x) bswap_16(x)
164 #define le2me_32(x) bswap_32(x)
165 #define le2me_64(x) bswap_64(x)
166 #else
167 #define be2me_16(x) bswap_16(x)
168 #define be2me_32(x) bswap_32(x)
169 #define be2me_64(x) bswap_64(x)
170 #define le2me_16(x) (x)
171 #define le2me_32(x) (x)
172 #define le2me_64(x) (x)
173 #endif
174
175 #endif /* __BSWAP_H__ */