| 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 */ |