/* * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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> #include "config.h" #include "libavutil/attributes.h" #define av_bswap16 av_bswap16 static av_always_inline av_const unsigned av_bswap16(unsigned x) { __asm__("rorw $8, %w0" : "+r"(x)); return x; } #define av_bswap32 av_bswap32 static av_always_inline av_const uint32_t av_bswap32(uint32_t x) { #if HAVE_BSWAP __asm__("bswap %0" : "+r" (x)); #else __asm__("rorw $8, %w0 \n\t" "rorl $16, %0 \n\t" "rorw $8, %w0" : "+r"(x)); #endif 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 /* AVUTIL_X86_BSWAP_H */