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libavutil
arm
bswap.h
Go to the documentation of this file.
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/*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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_BSWAP_H
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#define AVUTIL_ARM_BSWAP_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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#ifdef __ARMCC_VERSION
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#if HAVE_ARMV6
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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 { rev16 x, x }
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return
x;
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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
__rev(x);
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}
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#endif
/* HAVE_ARMV6 */
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#elif HAVE_INLINE_ASM
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#if HAVE_ARMV6
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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__(
"rev16 %0, %0"
:
"+r"
(x));
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return
x;
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}
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#endif
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#if !AV_GCC_VERSION_AT_LEAST(4,5)
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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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#if HAVE_ARMV6
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__asm__(
"rev %0, %0"
:
"+r"
(x));
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#else
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uint32_t
t
;
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__asm__ (
"eor %1, %0, %0, ror #16 \n\t"
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"bic %1, %1, #0xFF0000 \n\t"
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"mov %0, %0, ror #8 \n\t"
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"eor %0, %0, %1, lsr #8 \n\t"
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:
"+r"
(x),
"=&r"
(t));
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#endif
/* HAVE_ARMV6 */
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return
x;
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}
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#endif
/* !AV_GCC_VERSION_AT_LEAST(4,5) */
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#endif
/* __ARMCC_VERSION */
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#endif
/* AVUTIL_ARM_BSWAP_H */
av_const
#define av_const
Definition:
attributes.h:63
av_bswap16
#define av_bswap16
Definition:
bswap.h:31
attributes.h
Macro definitions for various function/variable attributes.
t
static float t
Definition:
output-example.c:54
av_bswap32
#define av_bswap32
Definition:
bswap.h:33
av_always_inline
#define av_always_inline
Definition:
attributes.h:39