Libav 0.7.1
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00001 /* 00002 * This file is part of Libav. 00003 * 00004 * Libav is free software; you can redistribute it and/or 00005 * modify it under the terms of the GNU Lesser General Public 00006 * License as published by the Free Software Foundation; either 00007 * version 2.1 of the License, or (at your option) any later version. 00008 * 00009 * Libav is distributed in the hope that it will be useful, 00010 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00012 * Lesser General Public License for more details. 00013 * 00014 * You should have received a copy of the GNU Lesser General Public 00015 * License along with Libav; if not, write to the Free Software 00016 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00017 */ 00018 00024 #ifndef AVUTIL_X86_BSWAP_H 00025 #define AVUTIL_X86_BSWAP_H 00026 00027 #include <stdint.h> 00028 #include "config.h" 00029 #include "libavutil/attributes.h" 00030 00031 #define av_bswap16 av_bswap16 00032 static av_always_inline av_const unsigned av_bswap16(unsigned x) 00033 { 00034 __asm__("rorw $8, %w0" : "+r"(x)); 00035 return x; 00036 } 00037 00038 #define av_bswap32 av_bswap32 00039 static av_always_inline av_const uint32_t av_bswap32(uint32_t x) 00040 { 00041 #if HAVE_BSWAP 00042 __asm__("bswap %0" : "+r" (x)); 00043 #else 00044 __asm__("rorw $8, %w0 \n\t" 00045 "rorl $16, %0 \n\t" 00046 "rorw $8, %w0" 00047 : "+r"(x)); 00048 #endif 00049 return x; 00050 } 00051 00052 #if ARCH_X86_64 00053 #define av_bswap64 av_bswap64 00054 static inline uint64_t av_const av_bswap64(uint64_t x) 00055 { 00056 __asm__("bswap %0": "=r" (x) : "0" (x)); 00057 return x; 00058 } 00059 #endif 00060 00061 #endif /* AVUTIL_X86_BSWAP_H */