fec54e63c56d38a9dd4ac65232506ce493a5f549
[libav.git] / libavutil / ppc / intreadwrite.h
1 /*
2 * Copyright (c) 2008 Mans Rullgard <mans@mansr.com>
3 *
4 * This file is part of Libav.
5 *
6 * Libav 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 * Libav 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 Libav; 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 */