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1 | /* |
2 | * Copyright (c) 2009 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_AVR32_INTREADWRITE_H | |
22 | #define AVUTIL_AVR32_INTREADWRITE_H | |
23 | ||
24 | #include <stdint.h> | |
25 | #include "config.h" | |
26 | #include "libavutil/bswap.h" | |
27 | ||
28 | /* | |
29 | * AVR32 does not support unaligned memory accesses, except for the AP | |
30 | * series which suppports unaligned 32-bit loads and stores. 16-bit | |
31 | * and 64-bit accesses must be aligned to 16 and 32 bits, respectively. | |
32 | * This means we cannot use the byte-swapping load/store instructions | |
33 | * here. | |
34 | * | |
35 | * For 16-bit, 24-bit, and (on UC series) 32-bit loads, we instead use | |
36 | * the LDINS.B instruction, which gcc fails to utilise with the | |
37 | * generic code. GCC also fails to use plain LD.W and ST.W even for | |
38 | * AP processors, so we override the generic code. The 64-bit | |
39 | * versions are improved by using our optimised 32-bit functions. | |
40 | */ | |
41 | ||
42 | #define AV_RL16 AV_RL16 | |
43 | static av_always_inline uint16_t AV_RL16(const void *p) | |
44 | { | |
45 | uint16_t v; | |
46 | __asm__ ("ld.ub %0, %1 \n\t" | |
47 | "ldins.b %0:l, %2 \n\t" | |
48 | : "=&r"(v) | |
49 | : "m"(*(const uint8_t*)p), "RKs12"(*((const uint8_t*)p+1))); | |
50 | return v; | |
51 | } | |
52 | ||
53 | #define AV_RB16 AV_RB16 | |
54 | static av_always_inline uint16_t AV_RB16(const void *p) | |
55 | { | |
56 | uint16_t v; | |
57 | __asm__ ("ld.ub %0, %2 \n\t" | |
58 | "ldins.b %0:l, %1 \n\t" | |
59 | : "=&r"(v) | |
60 | : "RKs12"(*(const uint8_t*)p), "m"(*((const uint8_t*)p+1))); | |
61 | return v; | |
62 | } | |
63 | ||
64 | #define AV_RB24 AV_RB24 | |
65 | static av_always_inline uint32_t AV_RB24(const void *p) | |
66 | { | |
67 | uint32_t v; | |
68 | __asm__ ("ld.ub %0, %3 \n\t" | |
69 | "ldins.b %0:l, %2 \n\t" | |
70 | "ldins.b %0:u, %1 \n\t" | |
71 | : "=&r"(v) | |
72 | : "RKs12"(* (const uint8_t*)p), | |
73 | "RKs12"(*((const uint8_t*)p+1)), | |
74 | "m" (*((const uint8_t*)p+2))); | |
75 | return v; | |
76 | } | |
77 | ||
78 | #define AV_RL24 AV_RL24 | |
79 | static av_always_inline uint32_t AV_RL24(const void *p) | |
80 | { | |
81 | uint32_t v; | |
82 | __asm__ ("ld.ub %0, %1 \n\t" | |
83 | "ldins.b %0:l, %2 \n\t" | |
84 | "ldins.b %0:u, %3 \n\t" | |
85 | : "=&r"(v) | |
86 | : "m" (* (const uint8_t*)p), | |
87 | "RKs12"(*((const uint8_t*)p+1)), | |
88 | "RKs12"(*((const uint8_t*)p+2))); | |
89 | return v; | |
90 | } | |
91 | ||
92 | #if ARCH_AVR32_AP | |
93 | ||
94 | #define AV_RB32 AV_RB32 | |
95 | static av_always_inline uint32_t AV_RB32(const void *p) | |
96 | { | |
97 | uint32_t v; | |
98 | __asm__ ("ld.w %0, %1" : "=r"(v) : "m"(*(const uint32_t*)p)); | |
99 | return v; | |
100 | } | |
101 | ||
102 | #define AV_WB32 AV_WB32 | |
103 | static av_always_inline void AV_WB32(void *p, uint32_t v) | |
104 | { | |
105 | __asm__ ("st.w %0, %1" : "=m"(*(uint32_t*)p) : "r"(v)); | |
106 | } | |
107 | ||
108 | /* These two would be defined by generic code, but we need them sooner. */ | |
109 | #define AV_RL32(p) av_bswap32(AV_RB32(p)) | |
110 | #define AV_WL32(p, v) AV_WB32(p, av_bswap32(v)) | |
111 | ||
112 | #define AV_WB64 AV_WB64 | |
113 | static av_always_inline void AV_WB64(void *p, uint64_t v) | |
114 | { | |
115 | union { uint64_t v; uint32_t hl[2]; } vv = { v }; | |
116 | AV_WB32(p, vv.hl[0]); | |
117 | AV_WB32((uint32_t*)p+1, vv.hl[1]); | |
118 | } | |
119 | ||
120 | #define AV_WL64 AV_WL64 | |
121 | static av_always_inline void AV_WL64(void *p, uint64_t v) | |
122 | { | |
123 | union { uint64_t v; uint32_t hl[2]; } vv = { v }; | |
124 | AV_WL32(p, vv.hl[1]); | |
125 | AV_WL32((uint32_t*)p+1, vv.hl[0]); | |
126 | } | |
127 | ||
128 | #else /* ARCH_AVR32_AP */ | |
129 | ||
130 | #define AV_RB32 AV_RB32 | |
131 | static av_always_inline uint32_t AV_RB32(const void *p) | |
132 | { | |
133 | uint32_t v; | |
134 | __asm__ ("ld.ub %0, %4 \n\t" | |
135 | "ldins.b %0:l, %3 \n\t" | |
136 | "ldins.b %0:u, %2 \n\t" | |
137 | "ldins.b %0:t, %1 \n\t" | |
138 | : "=&r"(v) | |
139 | : "RKs12"(* (const uint8_t*)p), | |
140 | "RKs12"(*((const uint8_t*)p+1)), | |
141 | "RKs12"(*((const uint8_t*)p+2)), | |
142 | "m" (*((const uint8_t*)p+3))); | |
143 | return v; | |
144 | } | |
145 | ||
146 | #define AV_RL32 AV_RL32 | |
147 | static av_always_inline uint32_t AV_RL32(const void *p) | |
148 | { | |
149 | uint32_t v; | |
150 | __asm__ ("ld.ub %0, %1 \n\t" | |
151 | "ldins.b %0:l, %2 \n\t" | |
152 | "ldins.b %0:u, %3 \n\t" | |
153 | "ldins.b %0:t, %4 \n\t" | |
154 | : "=&r"(v) | |
155 | : "m" (* (const uint8_t*)p), | |
156 | "RKs12"(*((const uint8_t*)p+1)), | |
157 | "RKs12"(*((const uint8_t*)p+2)), | |
158 | "RKs12"(*((const uint8_t*)p+3))); | |
159 | return v; | |
160 | } | |
161 | ||
162 | #endif /* ARCH_AVR32_AP */ | |
163 | ||
164 | #define AV_RB64 AV_RB64 | |
165 | static av_always_inline uint64_t AV_RB64(const void *p) | |
166 | { | |
167 | union { uint64_t v; uint32_t hl[2]; } v; | |
168 | v.hl[0] = AV_RB32(p); | |
169 | v.hl[1] = AV_RB32((const uint32_t*)p+1); | |
170 | return v.v; | |
171 | } | |
172 | ||
173 | #define AV_RL64 AV_RL64 | |
174 | static av_always_inline uint64_t AV_RL64(const void *p) | |
175 | { | |
176 | union { uint64_t v; uint32_t hl[2]; } v; | |
177 | v.hl[1] = AV_RL32(p); | |
178 | v.hl[0] = AV_RL32((const uint32_t*)p+1); | |
179 | return v.v; | |
180 | } | |
181 | ||
182 | #endif /* AVUTIL_AVR32_INTREADWRITE_H */ |