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