intreadwrite.h
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1 /*
2  * Copyright (c) 2009 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_MIPS_INTREADWRITE_H
22 #define AVUTIL_MIPS_INTREADWRITE_H
23 
24 #include <stdint.h>
25 #include "config.h"
26 
27 #if HAVE_INLINE_ASM
28 
29 #define AV_RN32 AV_RN32
30 static av_always_inline uint32_t AV_RN32(const void *p)
31 {
32  uint32_t v;
33  __asm__ ("lwl %0, %1 \n\t"
34  "lwr %0, %2 \n\t"
35  : "=&r"(v)
36  : "m"(*(const uint32_t *)((const uint8_t *)p+3*!HAVE_BIGENDIAN)),
37  "m"(*(const uint32_t *)((const uint8_t *)p+3*HAVE_BIGENDIAN)));
38  return v;
39 }
40 
41 #define AV_WN32 AV_WN32
42 static av_always_inline void AV_WN32(void *p, uint32_t v)
43 {
44  __asm__ ("swl %2, %0 \n\t"
45  "swr %2, %1 \n\t"
46  : "=m"(*(uint32_t *)((uint8_t *)p+3*!HAVE_BIGENDIAN)),
47  "=m"(*(uint32_t *)((uint8_t *)p+3*HAVE_BIGENDIAN))
48  : "r"(v));
49 }
50 
51 #if ARCH_MIPS64
52 
53 #define AV_RN64 AV_RN64
54 static av_always_inline uint64_t AV_RN64(const void *p)
55 {
56  uint64_t v;
57  __asm__ ("ldl %0, %1 \n\t"
58  "ldr %0, %2 \n\t"
59  : "=&r"(v)
60  : "m"(*(const uint64_t *)((const uint8_t *)p+7*!HAVE_BIGENDIAN)),
61  "m"(*(const uint64_t *)((const uint8_t *)p+7*HAVE_BIGENDIAN)));
62  return v;
63 }
64 
65 #define AV_WN64 AV_WN64
66 static av_always_inline void AV_WN64(void *p, uint64_t v)
67 {
68  __asm__ ("sdl %2, %0 \n\t"
69  "sdr %2, %1 \n\t"
70  : "=m"(*(uint64_t *)((uint8_t *)p+7*!HAVE_BIGENDIAN)),
71  "=m"(*(uint64_t *)((uint8_t *)p+7*HAVE_BIGENDIAN))
72  : "r"(v));
73 }
74 
75 #else
76 
77 #define AV_RN64 AV_RN64
78 static av_always_inline uint64_t AV_RN64(const void *p)
79 {
80  union { uint64_t v; uint32_t hl[2]; } v;
81  v.hl[0] = AV_RN32(p);
82  v.hl[1] = AV_RN32((const uint8_t *)p + 4);
83  return v.v;
84 }
85 
86 #define AV_WN64 AV_WN64
87 static av_always_inline void AV_WN64(void *p, uint64_t v)
88 {
89  union { uint64_t v; uint32_t hl[2]; } vv = { v };
90  AV_WN32(p, vv.hl[0]);
91  AV_WN32((uint8_t *)p + 4, vv.hl[1]);
92 }
93 
94 #endif /* ARCH_MIPS64 */
95 
96 #endif /* HAVE_INLINE_ASM */
97 
98 #endif /* AVUTIL_MIPS_INTREADWRITE_H */