| /* High precision, low overhead timing functions. i686 version. |
| Copyright (C) 1998-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. |
| |
| The GNU C Library 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. |
| |
| The GNU C Library 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 the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef _HP_TIMING_H |
| #define _HP_TIMING_H 1 |
| |
| /* We always assume having the timestamp register. */ |
| #define HP_TIMING_AVAIL (1) |
| #define HP_SMALL_TIMING_AVAIL (1) |
| |
| /* We indeed have inlined functions. */ |
| #define HP_TIMING_INLINE (1) |
| |
| /* We use 64bit values for the times. */ |
| typedef unsigned long long int hp_timing_t; |
| |
| /* That's quite simple. Use the `rdtsc' instruction. Note that the value |
| might not be 100% accurate since there might be some more instructions |
| running in this moment. This could be changed by using a barrier like |
| 'cpuid' right before the `rdtsc' instruciton. But we are not interested |
| in accurate clock cycles here so we don't do this. */ |
| #define HP_TIMING_NOW(Var) __asm__ __volatile__ ("rdtsc" : "=A" (Var)) |
| |
| #include <hp-timing-common.h> |
| |
| #endif /* hp-timing.h */ |
