1/* 2 * This file is part of Libav. 3 * 4 * Libav 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 * Libav 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 Libav; 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_bswap16 av_bswap16 30static av_always_inline av_const unsigned av_bswap16(unsigned x) 31{ 32 __asm { rev16 x, x } 33 return x; 34} 35 36#define av_bswap32 av_bswap32 37static av_always_inline av_const uint32_t av_bswap32(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 av_bswap16 av_bswap16 47static av_always_inline av_const unsigned av_bswap16(unsigned x) 48{ 49 __asm__("rev16 %0, %0" : "+r"(x)); 50 return x; 51} 52#endif 53 54#if !AV_GCC_VERSION_AT_LEAST(4,5) 55#define av_bswap32 av_bswap32 56static av_always_inline av_const uint32_t av_bswap32(uint32_t x) 57{ 58#if HAVE_ARMV6 59 __asm__("rev %0, %0" : "+r"(x)); 60#else 61 uint32_t t; 62 __asm__ ("eor %1, %0, %0, ror #16 \n\t" 63 "bic %1, %1, #0xFF0000 \n\t" 64 "mov %0, %0, ror #8 \n\t" 65 "eor %0, %0, %1, lsr #8 \n\t" 66 : "+r"(x), "=&r"(t)); 67#endif /* HAVE_ARMV6 */ 68 return x; 69} 70#endif /* !AV_GCC_VERSION_AT_LEAST(4,5) */ 71 72#endif /* __ARMCC_VERSION */ 73 74#endif /* AVUTIL_ARM_BSWAP_H */ 75