2 * This file is part of FFmpeg.
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.
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.
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
19 #ifndef AVUTIL_ARM_INTREADWRITE_H
20 #define AVUTIL_ARM_INTREADWRITE_H
24 #include "libavutil/attributes.h"
26 #if HAVE_FAST_UNALIGNED && HAVE_INLINE_ASM && !AV_GCC_VERSION_AT_LEAST(4,7)
28 #define AV_RN16 AV_RN16
29 static av_always_inline unsigned AV_RN16(const void *p)
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]));
38 __asm__ ("ldrh %0, %1" : "=r"(v) : "Uq"(q[0]), "m"(q[1]));
43 #define AV_WN16 AV_WN16
44 static av_always_inline void AV_WN16(void *p, uint16_t v)
46 __asm__ ("strh %1, %0" : "=m"(*(uint16_t *)p) : "r"(v));
49 #define AV_RN32 AV_RN32
50 static av_always_inline uint32_t AV_RN32(const void *p)
52 const struct __attribute__((packed)) { uint32_t v; } *q = p;
54 __asm__ ("ldr %0, %1" : "=r"(v) : "m"(*q));
58 #define AV_WN32 AV_WN32
59 static av_always_inline void AV_WN32(void *p, uint32_t v)
61 __asm__ ("str %1, %0" : "=m"(*(uint32_t *)p) : "r"(v));
66 #define AV_RN64 AV_RN64
67 static av_always_inline uint64_t AV_RN64(const void *p)
69 const struct __attribute__((packed)) { uint32_t v; } *q = p;
71 __asm__ ("ldr %Q0, %1 \n\t"
74 : "m"(q[0]), "m"(q[1]));
78 #define AV_WN64 AV_WN64
79 static av_always_inline void AV_WN64(void *p, uint64_t v)
81 __asm__ ("str %Q2, %0 \n\t"
83 : "=m"(*(uint32_t*)p), "=m"(*((uint32_t*)p+1))
87 #endif /* HAVE_ASM_MOD_Q */
89 #endif /* HAVE_INLINE_ASM */
91 #endif /* AVUTIL_ARM_INTREADWRITE_H */