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ffmpeg / libavutil / arm / intreadwrite.h @ bdd19e29

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/*
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#ifndef AVUTIL_ARM_INTREADWRITE_H
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#define AVUTIL_ARM_INTREADWRITE_H
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#include <stdint.h>
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#include "config.h"
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#if HAVE_FAST_UNALIGNED && HAVE_INLINE_ASM
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#define AV_RN16 AV_RN16
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static av_always_inline uint16_t AV_RN16(const void *p)
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{
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    uint16_t v;
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    __asm__ ("ldrh %0, %1" : "=r"(v) : "m"(*(const uint16_t *)p));
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    return v;
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}
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#define AV_WN16 AV_WN16
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static av_always_inline void AV_WN16(void *p, uint16_t v)
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{
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    __asm__ ("strh %1, %0" : "=m"(*(uint16_t *)p) : "r"(v));
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}
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#define AV_RN32 AV_RN32
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static av_always_inline uint32_t AV_RN32(const void *p)
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{
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    uint32_t v;
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    __asm__ ("ldr  %0, %1" : "=r"(v) : "m"(*(const uint32_t *)p));
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    return v;
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}
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#define AV_WN32 AV_WN32
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static av_always_inline void AV_WN32(void *p, uint32_t v)
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{
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    __asm__ ("str  %1, %0" : "=m"(*(uint32_t *)p) : "r"(v));
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}
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#define AV_RN64 AV_RN64
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static av_always_inline uint64_t AV_RN64(const void *p)
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{
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    union { uint64_t v; uint32_t hl[2]; } v;
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    __asm__ ("ldr   %0, %2  \n\t"
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             "ldr   %1, %3  \n\t"
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             : "=&r"(v.hl[0]), "=r"(v.hl[1])
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             : "m"(*(const uint32_t*)p), "m"(*((const uint32_t*)p+1)));
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    return v.v;
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}
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#define AV_WN64 AV_WN64
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static av_always_inline void AV_WN64(void *p, uint64_t v)
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{
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    union { uint64_t v; uint32_t hl[2]; } vv = { v };
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    __asm__ ("str  %2, %0  \n\t"
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             "str  %3, %1  \n\t"
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             : "=m"(*(uint32_t*)p), "=m"(*((uint32_t*)p+1))
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             : "r"(vv.hl[0]), "r"(vv.hl[1]));
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}
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#endif /* HAVE_INLINE_ASM */
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#endif /* AVUTIL_ARM_INTREADWRITE_H */