| /* | |
| * copyright (c) 2006 Michael Niedermayer <[email protected]> | |
| * | |
| * This file is part of FFmpeg. | |
| * | |
| * FFmpeg 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. | |
| * | |
| * FFmpeg 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 FFmpeg; if not, write to the Free Software | |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| */ | |
| static inline uint64_t read_time(void) | |
| { | |
| uint32_t a, d; | |
| __asm__ volatile( | |
| #if ARCH_X86_64 || defined(__SSE2__) | |
| "lfence \n\t" | |
| #endif | |
| "rdtsc \n\t" | |
| : "=a" (a), "=d" (d)); | |
| return ((uint64_t)d << 32) + a; | |
| } | |