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 31static inline uint64_t read_time(void) 32{ 33 uint32_t a, d; 34 __asm__ volatile("rdtsc" : "=a" (a), "=d" (d)); 35 return ((uint64_t)d << 32) + a; 36} 37 38#elif HAVE_RDTSC 39 40#include <intrin.h> 41#define AV_READ_TIME __rdtsc 42 43#endif /* HAVE_INLINE_ASM */ 44 45#endif /* AVUTIL_X86_TIMER_H */ 46