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 25#if HAVE_FAST_UNALIGNED && HAVE_INLINE_ASM 26 27#define AV_RN16 AV_RN16 28static av_always_inline uint16_t AV_RN16(const void *p) 29{ 30 uint16_t v; 31 __asm__ ("ldrh %0, %1" : "=r"(v) : "m"(*(const uint16_t *)p)); 32 return v; 33} 34 35#define AV_WN16 AV_WN16 36static av_always_inline void AV_WN16(void *p, uint16_t v) 37{ 38 __asm__ ("strh %1, %0" : "=m"(*(uint16_t *)p) : "r"(v)); 39} 40 41#define AV_RN32 AV_RN32 42static av_always_inline uint32_t AV_RN32(const void *p) 43{ 44 uint32_t v; 45 __asm__ ("ldr %0, %1" : "=r"(v) : "m"(*(const uint32_t *)p)); 46 return v; 47} 48 49#define AV_WN32 AV_WN32 50static av_always_inline void AV_WN32(void *p, uint32_t v) 51{ 52 __asm__ ("str %1, %0" : "=m"(*(uint32_t *)p) : "r"(v)); 53} 54 55#define AV_RN64 AV_RN64 56static av_always_inline uint64_t AV_RN64(const void *p) 57{ 58 union { uint64_t v; uint32_t hl[2]; } v; 59 __asm__ ("ldr %0, %2 \n\t" 60 "ldr %1, %3 \n\t" 61 : "=&r"(v.hl[0]), "=r"(v.hl[1]) 62 : "m"(*(const uint32_t*)p), "m"(*((const uint32_t*)p+1))); 63 return v.v; 64} 65 66#define AV_WN64 AV_WN64 67static av_always_inline void AV_WN64(void *p, uint64_t v) 68{ 69 union { uint64_t v; uint32_t hl[2]; } vv = { v }; 70 __asm__ ("str %2, %0 \n\t" 71 "str %3, %1 \n\t" 72 : "=m"(*(uint32_t*)p), "=m"(*((uint32_t*)p+1)) 73 : "r"(vv.hl[0]), "r"(vv.hl[1])); 74} 75 76#endif /* HAVE_INLINE_ASM */ 77 78#endif /* AVUTIL_ARM_INTREADWRITE_H */ 79