intreadwrite.h (2579B)
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_MOST(4,6) 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_MOST(4,5) 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 */