2340a9a935b7f4714f79f14ebbb5e7ebfaf63120
[deb_ffmpeg.git] / intreadwrite.h
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
29 static 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
44 static 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
50 static 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
59 static 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
67 static 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
79 static 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 */