/* * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVUTIL_ARM_INTREADWRITE_H #define AVUTIL_ARM_INTREADWRITE_H #include <stdint.h> #include "config.h" #include "libavutil/attributes.h" #if HAVE_FAST_UNALIGNED && HAVE_INLINE_ASM && !AV_GCC_VERSION_AT_LEAST(4,7) #define AV_RN16 AV_RN16 static av_always_inline unsigned AV_RN16(const void *p) { const uint8_t *q = p; unsigned v; #if !AV_GCC_VERSION_AT_LEAST(4,6) __asm__ ("ldrh %0, %1" : "=r"(v) : "m"(*(const uint16_t *)q)); #elif defined __thumb__ __asm__ ("ldrh %0, %1" : "=r"(v) : "m"(q[0]), "m"(q[1])); #else __asm__ ("ldrh %0, %1" : "=r"(v) : "Uq"(q[0]), "m"(q[1])); #endif return v; } #define AV_WN16 AV_WN16 static av_always_inline void AV_WN16(void *p, uint16_t v) { __asm__ ("strh %1, %0" : "=m"(*(uint16_t *)p) : "r"(v)); } #define AV_RN32 AV_RN32 static av_always_inline uint32_t AV_RN32(const void *p) { const struct __attribute__((packed)) { uint32_t v; } *q = p; uint32_t v; __asm__ ("ldr %0, %1" : "=r"(v) : "m"(*q)); return v; } #define AV_WN32 AV_WN32 static av_always_inline void AV_WN32(void *p, uint32_t v) { __asm__ ("str %1, %0" : "=m"(*(uint32_t *)p) : "r"(v)); } #if HAVE_ASM_MOD_Q #define AV_RN64 AV_RN64 static av_always_inline uint64_t AV_RN64(const void *p) { const struct __attribute__((packed)) { uint32_t v; } *q = p; uint64_t v; __asm__ ("ldr %Q0, %1 \n\t" "ldr %R0, %2 \n\t" : "=&r"(v) : "m"(q[0]), "m"(q[1])); return v; } #define AV_WN64 AV_WN64 static av_always_inline void AV_WN64(void *p, uint64_t v) { __asm__ ("str %Q2, %0 \n\t" "str %R2, %1 \n\t" : "=m"(*(uint32_t*)p), "=m"(*((uint32_t*)p+1)) : "r"(v)); } #endif /* HAVE_ASM_MOD_Q */ #endif /* HAVE_INLINE_ASM */ #endif /* AVUTIL_ARM_INTREADWRITE_H */