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intreadwrite.h
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1 /*
2  * Copyright (c) 2008 Mans Rullgard <mans@mansr.com>
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 #ifndef AVUTIL_PPC_INTREADWRITE_H
22 #define AVUTIL_PPC_INTREADWRITE_H
23 
24 #include <stdint.h>
25 #include "config.h"
26 
27 /*
28  * -O0 would compile the packed struct version, which is used by
29  * default, in an overly verbose fashion, so we override it here.
30  */
31 #if HAVE_BIGENDIAN
32 #define AV_RB64(p) (*(const uint64_t *)(p))
33 #define AV_WB64(p, v) (*(uint64_t *)(p) = (v))
34 
35 #else
36 #define AV_RL64(p) (*(const uint64_t *)(p))
37 #define AV_WL64(p, v) (*(uint64_t *)(p) = (v))
38 
39 #endif
40 
41 #if HAVE_XFORM_ASM
42 
43 #if HAVE_BIGENDIAN
44 #define AV_RL16 av_read_bswap16
45 #define AV_WL16 av_write_bswap16
46 #define AV_RL32 av_read_bswap32
47 #define AV_WL32 av_write_bswap32
48 #define AV_RL64 av_read_bswap64
49 #define AV_WL64 av_write_bswap64
50 
51 #else
52 #define AV_RB16 av_read_bswap16
53 #define AV_WB16 av_write_bswap16
54 #define AV_RB32 av_read_bswap32
55 #define AV_WB32 av_write_bswap32
56 #define AV_RB64 av_read_bswap64
57 #define AV_WB64 av_write_bswap64
58 
59 #endif
60 
61 static av_always_inline uint16_t av_read_bswap16(const void *p)
62 {
63  uint16_t v;
64  __asm__ ("lhbrx %0, %y1" : "=r"(v) : "Z"(*(const uint16_t*)p));
65  return v;
66 }
67 
68 static av_always_inline void av_write_bswap16(void *p, uint16_t v)
69 {
70  __asm__ ("sthbrx %1, %y0" : "=Z"(*(uint16_t*)p) : "r"(v));
71 }
72 
73 static av_always_inline uint32_t av_read_bswap32(const void *p)
74 {
75  uint32_t v;
76  __asm__ ("lwbrx %0, %y1" : "=r"(v) : "Z"(*(const uint32_t*)p));
77  return v;
78 }
79 
80 static av_always_inline void av_write_bswap32(void *p, uint32_t v)
81 {
82  __asm__ ("stwbrx %1, %y0" : "=Z"(*(uint32_t*)p) : "r"(v));
83 }
84 
85 #if HAVE_LDBRX
86 
87 static av_always_inline uint64_t av_read_bswap64(const void *p)
88 {
89  uint64_t v;
90  __asm__ ("ldbrx %0, %y1" : "=r"(v) : "Z"(*(const uint64_t*)p));
91  return v;
92 }
93 
94 static av_always_inline void av_write_bswap64(void *p, uint64_t v)
95 {
96  __asm__ ("stdbrx %1, %y0" : "=Z"(*(uint64_t*)p) : "r"(v));
97 }
98 
99 #else
100 
101 static av_always_inline uint64_t av_read_bswap64(const void *p)
102 {
103  union { uint64_t v; uint32_t hl[2]; } v;
104  __asm__ ("lwbrx %0, %y2 \n\t"
105  "lwbrx %1, %y3 \n\t"
106  : "=&r"(v.hl[1]), "=r"(v.hl[0])
107  : "Z"(*(const uint32_t*)p), "Z"(*((const uint32_t*)p+1)));
108  return v.v;
109 }
110 
111 static av_always_inline void av_write_bswap64(void *p, uint64_t v)
112 {
113  union { uint64_t v; uint32_t hl[2]; } vv = { v };
114  __asm__ ("stwbrx %2, %y0 \n\t"
115  "stwbrx %3, %y1 \n\t"
116  : "=Z"(*(uint32_t*)p), "=Z"(*((uint32_t*)p+1))
117  : "r"(vv.hl[1]), "r"(vv.hl[0]));
118 }
119 
120 #endif /* HAVE_LDBRX */
121 
122 #endif /* HAVE_XFORM_ASM */
123 
124 #endif /* AVUTIL_PPC_INTREADWRITE_H */