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 bswap_16 bswap_16 30static av_always_inline av_const unsigned bswap_16(unsigned x) 31{ 32 __asm { rev16 x, x } 33 return x; 34} 35 36#define bswap_32 bswap_32 37static av_always_inline av_const uint32_t bswap_32(uint32_t x) 38{ 39 return __rev(x); 40} 41#endif /* HAVE_ARMV6 */ 42 43#elif HAVE_INLINE_ASM 44 45#if HAVE_ARMV6 46#define bswap_16 bswap_16 47static av_always_inline av_const unsigned bswap_16(unsigned x) 48{ 49 __asm__("rev16 %0, %0" : "+r"(x)); 50 return x; 51} 52#endif 53 54#define bswap_32 bswap_32 55static av_always_inline av_const uint32_t bswap_32(uint32_t x) 56{ 57#if HAVE_ARMV6 58 __asm__("rev %0, %0" : "+r"(x)); 59#else 60 uint32_t t; 61 __asm__ ("eor %1, %0, %0, ror #16 \n\t" 62 "bic %1, %1, #0xFF0000 \n\t" 63 "mov %0, %0, ror #8 \n\t" 64 "eor %0, %0, %1, lsr #8 \n\t" 65 : "+r"(x), "=&r"(t)); 66#endif /* HAVE_ARMV6 */ 67 return x; 68} 69 70#endif /* __ARMCC_VERSION */ 71 72#endif /* AVUTIL_ARM_BSWAP_H */ 73