timer.h (1402B)
1 /* 2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21 #ifndef AVUTIL_X86_TIMER_H 22 #define AVUTIL_X86_TIMER_H 23 24 #include <stdint.h> 25 26 #if HAVE_INLINE_ASM 27 28 #define FF_TIMER_UNITS "decicycles" 29 #define AV_READ_TIME read_time 30 31 static inline uint64_t read_time(void) 32 { 33 uint32_t a, d; 34 __asm__ volatile( 35 #if ARCH_X86_64 || defined(__SSE2__) 36 "lfence \n\t" 37 #endif 38 "rdtsc \n\t" 39 : "=a" (a), "=d" (d)); 40 return ((uint64_t)d << 32) + a; 41 } 42 43 #elif HAVE_RDTSC 44 45 #include <intrin.h> 46 #define AV_READ_TIME __rdtsc 47 48 #endif /* HAVE_INLINE_ASM */ 49 50 #endif /* AVUTIL_X86_TIMER_H */