bswap.h (1896B)
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 /** 20 * @file 21 * byte swapping routines 22 */ 23 24 #ifndef AVUTIL_X86_BSWAP_H 25 #define AVUTIL_X86_BSWAP_H 26 27 #include <stdint.h> 28 #if defined(_MSC_VER) 29 #include <stdlib.h> 30 #include <intrin.h> 31 #endif 32 #include "config.h" 33 #include "libavutil/attributes.h" 34 35 #if defined(_MSC_VER) 36 37 #define av_bswap16 av_bswap16 38 static av_always_inline av_const uint16_t av_bswap16(uint16_t x) 39 { 40 return _rotr16(x, 8); 41 } 42 43 #define av_bswap32 av_bswap32 44 static av_always_inline av_const uint32_t av_bswap32(uint32_t x) 45 { 46 return _byteswap_ulong(x); 47 } 48 49 #if ARCH_X86_64 50 #define av_bswap64 av_bswap64 51 static inline uint64_t av_const av_bswap64(uint64_t x) 52 { 53 return _byteswap_uint64(x); 54 } 55 #endif 56 57 58 #elif HAVE_INLINE_ASM 59 60 #ifdef __INTEL_COMPILER 61 #define av_bswap32 av_bswap32 62 static av_always_inline av_const uint32_t av_bswap32(uint32_t x) 63 { 64 __asm__("bswap %0" : "+r" (x)); 65 return x; 66 } 67 68 #if ARCH_X86_64 69 #define av_bswap64 av_bswap64 70 static inline uint64_t av_const av_bswap64(uint64_t x) 71 { 72 __asm__("bswap %0": "=r" (x) : "0" (x)); 73 return x; 74 } 75 #endif 76 #endif /* __INTEL_COMPILER */ 77 78 #endif /* HAVE_INLINE_ASM */ 79 #endif /* AVUTIL_X86_BSWAP_H */