1/* 2 * This file is part of FFmpeg. 3 * 4 * FFmpeg is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation; either 7 * version 2.1 of the License, or (at your option) any later version. 8 * 9 * FFmpeg is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public 15 * License along with FFmpeg; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 19/** 20 * @file 21 * byte swapping routines 22 */ 23 24#ifndef AVUTIL_X86_BSWAP_H 25#define AVUTIL_X86_BSWAP_H 26 27#include <stdint.h> 28#include "config.h" 29#include "libavutil/attributes.h" 30 31#define bswap_16 bswap_16 32static av_always_inline av_const uint16_t bswap_16(uint16_t x) 33{ 34 __asm__("rorw $8, %0" : "+r"(x)); 35 return x; 36} 37 38#define bswap_32 bswap_32 39static av_always_inline av_const uint32_t bswap_32(uint32_t x) 40{ 41#if HAVE_BSWAP 42 __asm__("bswap %0" : "+r" (x)); 43#else 44 __asm__("rorw $8, %w0 \n\t" 45 "rorl $16, %0 \n\t" 46 "rorw $8, %w0" 47 : "+r"(x)); 48#endif 49 return x; 50} 51 52#if ARCH_X86_64 53#define bswap_64 bswap_64 54static inline uint64_t av_const bswap_64(uint64_t x) 55{ 56 __asm__("bswap %0": "=r" (x) : "0" (x)); 57 return x; 58} 59#endif 60 61#endif /* AVUTIL_X86_BSWAP_H */ 62