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#ifndef AVUTIL_ARM_BSWAP_H 20#define AVUTIL_ARM_BSWAP_H 21 22#include <stdint.h> 23#include "config.h" 24#include "libavutil/common.h" 25 26#if HAVE_ARMV6 27#define bswap_16 bswap_16 28static av_always_inline av_const uint16_t bswap_16(uint16_t x) 29{ 30 __asm__("rev16 %0, %0" : "+r"(x)); 31 return x; 32} 33#endif 34 35#define bswap_32 bswap_32 36static av_always_inline av_const uint32_t bswap_32(uint32_t x) 37{ 38#if HAVE_ARMV6 39 __asm__("rev %0, %0" : "+r"(x)); 40#else 41 uint32_t t; 42 __asm__ ("eor %1, %0, %0, ror #16 \n\t" 43 "bic %1, %1, #0xFF0000 \n\t" 44 "mov %0, %0, ror #8 \n\t" 45 "eor %0, %0, %1, lsr #8 \n\t" 46 : "+r"(x), "=&r"(t)); 47#endif /* HAVE_ARMV6 */ 48 return x; 49} 50 51#endif /* AVUTIL_ARM_BSWAP_H */ 52