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libavutil
arm
intreadwrite.h
Go to the documentation of this file.
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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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#include "
libavutil/attributes.h
"
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#if HAVE_FAST_UNALIGNED && HAVE_INLINE_ASM && !AV_GCC_VERSION_AT_LEAST(4,7)
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#define AV_RN16 AV_RN16
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static
av_always_inline
unsigned
AV_RN16
(
const
void
*p)
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{
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const
uint8_t
*q = p;
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unsigned
v
;
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#if !AV_GCC_VERSION_AT_LEAST(4,6)
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__asm__ (
"ldrh %0, %1"
:
"=r"
(v) :
"m"
(*(
const
uint16_t *)q));
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#elif defined __thumb__
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__asm__ (
"ldrh %0, %1"
:
"=r"
(v) :
"m"
(q[0]),
"m"
(q[1]));
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#else
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__asm__ (
"ldrh %0, %1"
:
"=r"
(v) :
"Uq"
(q[0]),
"m"
(q[1]));
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#endif
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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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const
struct
__attribute__((packed)) { uint32_t
v
; } *q = p;
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uint32_t
v
;
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__asm__ (
"ldr %0, %1"
:
"=r"
(v) :
"m"
(*q));
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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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#if HAVE_ASM_MOD_Q
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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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const
struct
__attribute__((packed)) { uint32_t
v
; } *q = p;
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uint64_t
v
;
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__asm__ (
"ldr %Q0, %1 \n\t"
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"ldr %R0, %2 \n\t"
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:
"=&r"
(v)
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:
"m"
(q[0]),
"m"
(q[1]));
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return
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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__asm__ (
"str %Q2, %0 \n\t"
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"str %R2, %1 \n\t"
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:
"=m"
(*(uint32_t*)p),
"=m"
(*((uint32_t*)p+1))
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:
"r"
(v));
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}
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#endif
/* HAVE_ASM_MOD_Q */
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#endif
/* HAVE_INLINE_ASM */
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#endif
/* AVUTIL_ARM_INTREADWRITE_H */
Generated on Sun Mar 23 2014 23:50:14 for FFmpeg by
1.8.2