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/attributes.h" 25 26#ifdef __ARMCC_VERSION 27 28#if HAVE_ARMV6 29#define av_bswap32 av_bswap32 30static av_always_inline av_const uint32_t av_bswap32(uint32_t x) 31{ 32 return __rev(x); 33} 34#endif /* HAVE_ARMV6 */ 35 36#elif HAVE_INLINE_ASM 37 38#if HAVE_ARMV6_INLINE 39#define av_bswap16 av_bswap16 40static av_always_inline av_const unsigned av_bswap16(unsigned x) 41{ 42 __asm__("rev16 %0, %0" : "+r"(x)); 43 return x; 44} 45#endif 46 47#if AV_GCC_VERSION_AT_MOST(4,4) 48#define av_bswap32 av_bswap32 49static av_always_inline av_const uint32_t av_bswap32(uint32_t x) 50{ 51#if HAVE_ARMV6_INLINE 52 __asm__("rev %0, %0" : "+r"(x)); 53#else 54 uint32_t t; 55 __asm__ ("eor %1, %0, %0, ror #16 \n\t" 56 "bic %1, %1, #0xFF0000 \n\t" 57 "mov %0, %0, ror #8 \n\t" 58 "eor %0, %0, %1, lsr #8 \n\t" 59 : "+r"(x), "=&r"(t)); 60#endif /* HAVE_ARMV6_INLINE */ 61 return x; 62} 63#endif /* AV_GCC_VERSION_AT_MOST(4,4) */ 64 65#endif /* __ARMCC_VERSION */ 66 67#endif /* AVUTIL_ARM_BSWAP_H */ 68