yading@11: /*
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * byte swapping routines
yading@11:  */
yading@11: 
yading@11: #ifndef AVUTIL_X86_BSWAP_H
yading@11: #define AVUTIL_X86_BSWAP_H
yading@11: 
yading@11: #include <stdint.h>
yading@11: #include "config.h"
yading@11: #include "libavutil/attributes.h"
yading@11: 
yading@11: #if HAVE_INLINE_ASM
yading@11: 
yading@11: #if !AV_GCC_VERSION_AT_LEAST(4,1)
yading@11: #define av_bswap16 av_bswap16
yading@11: static av_always_inline av_const unsigned av_bswap16(unsigned x)
yading@11: {
yading@11:     __asm__("rorw $8, %w0" : "+r"(x));
yading@11:     return x;
yading@11: }
yading@11: #endif /* !AV_GCC_VERSION_AT_LEAST(4,1) */
yading@11: 
yading@11: #if !AV_GCC_VERSION_AT_LEAST(4,5)
yading@11: #define av_bswap32 av_bswap32
yading@11: static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
yading@11: {
yading@11:     __asm__("bswap   %0" : "+r" (x));
yading@11:     return x;
yading@11: }
yading@11: 
yading@11: #if ARCH_X86_64
yading@11: #define av_bswap64 av_bswap64
yading@11: static inline uint64_t av_const av_bswap64(uint64_t x)
yading@11: {
yading@11:     __asm__("bswap  %0": "=r" (x) : "0" (x));
yading@11:     return x;
yading@11: }
yading@11: #endif
yading@11: #endif /* !AV_GCC_VERSION_AT_LEAST(4,5) */
yading@11: 
yading@11: #endif /* HAVE_INLINE_ASM */
yading@11: #endif /* AVUTIL_X86_BSWAP_H */