1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19#ifndef AVUTIL_ARM_INTREADWRITE_H
20#define AVUTIL_ARM_INTREADWRITE_H
21
22#include <stdint.h>
23#include "config.h"
24#include "libavutil/attributes.h"
25
26#if HAVE_FAST_UNALIGNED && HAVE_INLINE_ASM && !AV_GCC_VERSION_AT_LEAST(4,7)
27
28#define AV_RN16 AV_RN16
29static av_always_inline unsigned AV_RN16(const void *p)
30{
31    const uint8_t *q = p;
32    unsigned v;
33#if !AV_GCC_VERSION_AT_LEAST(4,6)
34    __asm__ ("ldrh %0, %1" : "=r"(v) : "m"(*(const uint16_t *)q));
35#elif defined __thumb__
36    __asm__ ("ldrh %0, %1" : "=r"(v) : "m"(q[0]), "m"(q[1]));
37#else
38    __asm__ ("ldrh %0, %1" : "=r"(v) : "Uq"(q[0]), "m"(q[1]));
39#endif
40    return v;
41}
42
43#define AV_WN16 AV_WN16
44static av_always_inline void AV_WN16(void *p, uint16_t v)
45{
46    __asm__ ("strh %1, %0" : "=m"(*(uint16_t *)p) : "r"(v));
47}
48
49#define AV_RN32 AV_RN32
50static av_always_inline uint32_t AV_RN32(const void *p)
51{
52    const struct __attribute__((packed)) { uint32_t v; } *q = p;
53    uint32_t v;
54    __asm__ ("ldr  %0, %1" : "=r"(v) : "m"(*q));
55    return v;
56}
57
58#define AV_WN32 AV_WN32
59static av_always_inline void AV_WN32(void *p, uint32_t v)
60{
61    __asm__ ("str  %1, %0" : "=m"(*(uint32_t *)p) : "r"(v));
62}
63
64#if HAVE_ASM_MOD_Q
65
66#define AV_RN64 AV_RN64
67static av_always_inline uint64_t AV_RN64(const void *p)
68{
69    const struct __attribute__((packed)) { uint32_t v; } *q = p;
70    uint64_t v;
71    __asm__ ("ldr   %Q0, %1  \n\t"
72             "ldr   %R0, %2  \n\t"
73             : "=&r"(v)
74             : "m"(q[0]), "m"(q[1]));
75    return v;
76}
77
78#define AV_WN64 AV_WN64
79static av_always_inline void AV_WN64(void *p, uint64_t v)
80{
81    __asm__ ("str  %Q2, %0  \n\t"
82             "str  %R2, %1  \n\t"
83             : "=m"(*(uint32_t*)p), "=m"(*((uint32_t*)p+1))
84             : "r"(v));
85}
86
87#endif /* HAVE_ASM_MOD_Q */
88
89#endif /* HAVE_INLINE_ASM */
90
91#endif /* AVUTIL_ARM_INTREADWRITE_H */
92