FFmpeg  4.0
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 #if HAVE_XFORM_ASM
28 
29 #if HAVE_BIGENDIAN
30 #define AV_RL16 av_read_bswap16
31 #define AV_WL16 av_write_bswap16
32 #define AV_RL32 av_read_bswap32
33 #define AV_WL32 av_write_bswap32
34 #define AV_RL64 av_read_bswap64
35 #define AV_WL64 av_write_bswap64
36 
37 #else
38 #define AV_RB16 av_read_bswap16
39 #define AV_WB16 av_write_bswap16
40 #define AV_RB32 av_read_bswap32
41 #define AV_WB32 av_write_bswap32
42 #define AV_RB64 av_read_bswap64
43 #define AV_WB64 av_write_bswap64
44 
45 #endif
46 
47 static av_always_inline uint16_t av_read_bswap16(const void *p)
48 {
49  uint16_t v;
50  __asm__ ("lhbrx %0, %y1" : "=r"(v) : "Z"(*(const uint16_t*)p));
51  return v;
52 }
53 
54 static av_always_inline void av_write_bswap16(void *p, uint16_t v)
55 {
56  __asm__ ("sthbrx %1, %y0" : "=Z"(*(uint16_t*)p) : "r"(v));
57 }
58 
59 static av_always_inline uint32_t av_read_bswap32(const void *p)
60 {
61  uint32_t v;
62  __asm__ ("lwbrx %0, %y1" : "=r"(v) : "Z"(*(const uint32_t*)p));
63  return v;
64 }
65 
66 static av_always_inline void av_write_bswap32(void *p, uint32_t v)
67 {
68  __asm__ ("stwbrx %1, %y0" : "=Z"(*(uint32_t*)p) : "r"(v));
69 }
70 
71 #if HAVE_LDBRX
72 
73 static av_always_inline uint64_t av_read_bswap64(const void *p)
74 {
75  uint64_t v;
76  __asm__ ("ldbrx %0, %y1" : "=r"(v) : "Z"(*(const uint64_t*)p));
77  return v;
78 }
79 
80 static av_always_inline void av_write_bswap64(void *p, uint64_t v)
81 {
82  __asm__ ("stdbrx %1, %y0" : "=Z"(*(uint64_t*)p) : "r"(v));
83 }
84 
85 #else
86 
87 static av_always_inline uint64_t av_read_bswap64(const void *p)
88 {
89  union { uint64_t v; uint32_t hl[2]; } v;
90  __asm__ ("lwbrx %0, %y2 \n\t"
91  "lwbrx %1, %y3 \n\t"
92  : "=&r"(v.hl[1]), "=r"(v.hl[0])
93  : "Z"(*(const uint32_t*)p), "Z"(*((const uint32_t*)p+1)));
94  return v.v;
95 }
96 
97 static av_always_inline void av_write_bswap64(void *p, uint64_t v)
98 {
99  union { uint64_t v; uint32_t hl[2]; } vv = { v };
100  __asm__ ("stwbrx %2, %y0 \n\t"
101  "stwbrx %3, %y1 \n\t"
102  : "=Z"(*(uint32_t*)p), "=Z"(*((uint32_t*)p+1))
103  : "r"(vv.hl[1]), "r"(vv.hl[0]));
104 }
105 
106 #endif /* HAVE_LDBRX */
107 
108 #endif /* HAVE_XFORM_ASM */
109 
110 #endif /* AVUTIL_PPC_INTREADWRITE_H */
#define av_always_inline
Definition: attributes.h:39