aboutsummaryrefslogtreecommitdiffstats
path: root/libavutil/avr32/intreadwrite.h
blob: 95179f1d11aa86326a3d335d30bcc1593a724fe3 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
/*
 * Copyright (c) 2009 Mans Rullgard <mans@mansr.com>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVUTIL_AVR32_INTREADWRITE_H
#define AVUTIL_AVR32_INTREADWRITE_H

#include <stdint.h>
#include "config.h"
#include "libavutil/bswap.h"

/*
 * AVR32 does not support unaligned memory accesses, except for the AP
 * series which supports unaligned 32-bit loads and stores.  16-bit
 * and 64-bit accesses must be aligned to 16 and 32 bits, respectively.
 * This means we cannot use the byte-swapping load/store instructions
 * here.
 *
 * For 16-bit, 24-bit, and (on UC series) 32-bit loads, we instead use
 * the LDINS.B instruction, which gcc fails to utilise with the
 * generic code.  GCC also fails to use plain LD.W and ST.W even for
 * AP processors, so we override the generic code.  The 64-bit
 * versions are improved by using our optimised 32-bit functions.
 */

#define AV_RL16 AV_RL16
static av_always_inline uint16_t AV_RL16(const void *p)
{
    uint16_t v;
    __asm__ ("ld.ub    %0,   %1  \n\t"
             "ldins.b  %0:l, %2  \n\t"
             : "=&r"(v)
             : "m"(*(const uint8_t*)p), "RKs12"(*((const uint8_t*)p+1)));
    return v;
}

#define AV_RB16 AV_RB16
static av_always_inline uint16_t AV_RB16(const void *p)
{
    uint16_t v;
    __asm__ ("ld.ub    %0,   %2  \n\t"
             "ldins.b  %0:l, %1  \n\t"
             : "=&r"(v)
             : "RKs12"(*(const uint8_t*)p), "m"(*((const uint8_t*)p+1)));
    return v;
}

#define AV_RB24 AV_RB24
static av_always_inline uint32_t AV_RB24(const void *p)
{
    uint32_t v;
    __asm__ ("ld.ub    %0,   %3  \n\t"
             "ldins.b  %0:l, %2  \n\t"
             "ldins.b  %0:u, %1  \n\t"
             : "=&r"(v)
             : "RKs12"(* (const uint8_t*)p),
               "RKs12"(*((const uint8_t*)p+1)),
               "m"    (*((const uint8_t*)p+2)));
    return v;
}

#define AV_RL24 AV_RL24
static av_always_inline uint32_t AV_RL24(const void *p)
{
    uint32_t v;
    __asm__ ("ld.ub    %0,   %1  \n\t"
             "ldins.b  %0:l, %2  \n\t"
             "ldins.b  %0:u, %3  \n\t"
             : "=&r"(v)
             : "m"    (* (const uint8_t*)p),
               "RKs12"(*((const uint8_t*)p+1)),
               "RKs12"(*((const uint8_t*)p+2)));
    return v;
}

#if ARCH_AVR32_AP

#define AV_RB32 AV_RB32
static av_always_inline uint32_t AV_RB32(const void *p)
{
    uint32_t v;
    __asm__ ("ld.w %0, %1" : "=r"(v) : "m"(*(const uint32_t*)p));
    return v;
}

#define AV_WB32 AV_WB32
static av_always_inline void AV_WB32(void *p, uint32_t v)
{
    __asm__ ("st.w %0, %1" : "=m"(*(uint32_t*)p) : "r"(v));
}

/* These two would be defined by generic code, but we need them sooner. */
#define AV_RL32(p)    av_bswap32(AV_RB32(p))
#define AV_WL32(p, v) AV_WB32(p, av_bswap32(v))

#define AV_WB64 AV_WB64
static av_always_inline void AV_WB64(void *p, uint64_t v)
{
    union { uint64_t v; uint32_t hl[2]; } vv = { v };
    AV_WB32(p, vv.hl[0]);
    AV_WB32((uint32_t*)p+1, vv.hl[1]);
}

#define AV_WL64 AV_WL64
static av_always_inline void AV_WL64(void *p, uint64_t v)
{
    union { uint64_t v; uint32_t hl[2]; } vv = { v };
    AV_WL32(p, vv.hl[1]);
    AV_WL32((uint32_t*)p+1, vv.hl[0]);
}

#else /* ARCH_AVR32_AP */

#define AV_RB32 AV_RB32
static av_always_inline uint32_t AV_RB32(const void *p)
{
    uint32_t v;
    __asm__ ("ld.ub    %0,   %4  \n\t"
             "ldins.b  %0:l, %3  \n\t"
             "ldins.b  %0:u, %2  \n\t"
             "ldins.b  %0:t, %1  \n\t"
             : "=&r"(v)
             : "RKs12"(* (const uint8_t*)p),
               "RKs12"(*((const uint8_t*)p+1)),
               "RKs12"(*((const uint8_t*)p+2)),
               "m"    (*((const uint8_t*)p+3)));
    return v;
}

#define AV_RL32 AV_RL32
static av_always_inline uint32_t AV_RL32(const void *p)
{
    uint32_t v;
    __asm__ ("ld.ub    %0,   %1  \n\t"
             "ldins.b  %0:l, %2  \n\t"
             "ldins.b  %0:u, %3  \n\t"
             "ldins.b  %0:t, %4  \n\t"
             : "=&r"(v)
             : "m"    (* (const uint8_t*)p),
               "RKs12"(*((const uint8_t*)p+1)),
               "RKs12"(*((const uint8_t*)p+2)),
               "RKs12"(*((const uint8_t*)p+3)));
    return v;
}

#endif /* ARCH_AVR32_AP */

#define AV_RB64 AV_RB64
static av_always_inline uint64_t AV_RB64(const void *p)
{
    union { uint64_t v; uint32_t hl[2]; } v;
    v.hl[0] = AV_RB32(p);
    v.hl[1] = AV_RB32((const uint32_t*)p+1);
    return v.v;
}

#define AV_RL64 AV_RL64
static av_always_inline uint64_t AV_RL64(const void *p)
{
    union { uint64_t v; uint32_t hl[2]; } v;
    v.hl[1] = AV_RL32(p);
    v.hl[0] = AV_RL32((const uint32_t*)p+1);
    return v.v;
}

#endif /* AVUTIL_AVR32_INTREADWRITE_H */