/* * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * byte swapping routines */ #ifndef AVUTIL_X86_BSWAP_H #define AVUTIL_X86_BSWAP_H #include <stdint.h> #if defined(_MSC_VER) #include <intrin.h> #endif #include "config.h" #include "libavutil/attributes.h" #if defined(_MSC_VER) #define av_bswap16 av_bswap16 static av_always_inline av_const uint16_t av_bswap16(uint16_t x) { return _rotr16(x, 8); } #define av_bswap32 av_bswap32 static av_always_inline av_const uint32_t av_bswap32(uint32_t x) { return _byteswap_ulong(x); } #if ARCH_X86_64 #define av_bswap64 av_bswap64 static inline uint64_t av_const av_bswap64(uint64_t x) { return _byteswap_uint64(x); } #endif #elif HAVE_INLINE_ASM #if AV_GCC_VERSION_AT_MOST(4,0) #define av_bswap16 av_bswap16 static av_always_inline av_const unsigned av_bswap16(unsigned x) { __asm__("rorw $8, %w0" : "+r"(x)); return x; } #endif /* AV_GCC_VERSION_AT_MOST(4,0) */ #if AV_GCC_VERSION_AT_MOST(4,4) || defined(__INTEL_COMPILER) #define av_bswap32 av_bswap32 static av_always_inline av_const uint32_t av_bswap32(uint32_t x) { __asm__("bswap %0" : "+r" (x)); return x; } #if ARCH_X86_64 #define av_bswap64 av_bswap64 static inline uint64_t av_const av_bswap64(uint64_t x) { __asm__("bswap %0": "=r" (x) : "0" (x)); return x; } #endif #endif /* AV_GCC_VERSION_AT_MOST(4,4) */ #endif /* HAVE_INLINE_ASM */ #endif /* AVUTIL_X86_BSWAP_H */