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libavutil
x86
bswap.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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/**
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* @file
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* byte swapping routines
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*/
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#ifndef AVUTIL_X86_BSWAP_H
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#define AVUTIL_X86_BSWAP_H
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#include <stdint.h>
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#if defined(_MSC_VER)
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#include <intrin.h>
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#endif
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#include "
config.h
"
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#include "
libavutil/attributes.h
"
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#if defined(_MSC_VER)
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#define av_bswap16 av_bswap16
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static
av_always_inline
av_const
uint16_t
av_bswap16
(uint16_t x)
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{
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return
_rotr16(x, 8);
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}
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#define av_bswap32 av_bswap32
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static
av_always_inline
av_const
uint32_t
av_bswap32
(uint32_t x)
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{
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return
_byteswap_ulong(x);
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}
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#if ARCH_X86_64
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#define av_bswap64 av_bswap64
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static
inline
uint64_t
av_const
av_bswap64
(uint64_t x)
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{
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return
_byteswap_uint64(x);
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}
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#endif
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#elif HAVE_INLINE_ASM
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#if AV_GCC_VERSION_AT_MOST(4,0)
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#define av_bswap16 av_bswap16
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static
av_always_inline
av_const
unsigned
av_bswap16
(
unsigned
x)
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{
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__asm__(
"rorw $8, %w0"
:
"+r"
(x));
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return
x;
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}
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#endif
/* AV_GCC_VERSION_AT_MOST(4,0) */
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#if AV_GCC_VERSION_AT_MOST(4,4) || defined(__INTEL_COMPILER)
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#define av_bswap32 av_bswap32
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static
av_always_inline
av_const
uint32_t
av_bswap32
(uint32_t x)
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{
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__asm__(
"bswap %0"
:
"+r"
(x));
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return
x;
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}
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#if ARCH_X86_64
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#define av_bswap64 av_bswap64
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static
inline
uint64_t
av_const
av_bswap64
(uint64_t x)
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{
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__asm__(
"bswap %0"
:
"=r"
(x) :
"0"
(x));
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return
x;
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}
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#endif
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#endif
/* AV_GCC_VERSION_AT_MOST(4,4) */
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#endif
/* HAVE_INLINE_ASM */
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#endif
/* AVUTIL_X86_BSWAP_H */
av_const
#define av_const
Definition:
attributes.h:76
av_bswap16
#define av_bswap16
Definition:
bswap.h:31
attributes.h
Macro definitions for various function/variable attributes.
config.h
av_bswap32
#define av_bswap32
Definition:
bswap.h:33
av_bswap64
static uint64_t av_const av_bswap64(uint64_t x)
Definition:
bswap.h:73
av_always_inline
#define av_always_inline
Definition:
attributes.h:39
Generated on Fri Jan 12 2018 01:46:00 for FFmpeg by
1.8.6