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65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
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/* Copyright (C) 2015 RWTH Aachen University, Germany.
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Contributed by Stefan Lankes <slankes@eonerc.rwth-aachen.de>.
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Libgomp is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/*
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* This file contains system specific timer routines. It is expected that
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* a system may well want to write special versions of each of these.
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*/
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#include "libgomp.h"
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#include <unistd.h>
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extern unsigned int get_cpufreq(void);
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static unsigned long long start_tsc;
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inline static unsigned long long rdtsc(void)
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{
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unsigned long lo, hi;
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asm volatile ("rdtsc" : "=a"(lo), "=d"(hi) :: "memory");
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return ((unsigned long long) hi << 32ULL | (unsigned long long) lo);
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}
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__attribute__((constructor)) static void timer_init()
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{
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start_tsc = rdtsc();
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}
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double
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omp_get_wtime (void)
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{
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double ret;
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ret = (double) (rdtsc() - start_tsc) / ((double) get_cpufreq() * 1000000.0);
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//printf("CPU frequency: %d MHz\n", get_cpufreq());
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return ret;
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}
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double
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omp_get_wtick (void)
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{
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return 1.0 / ((double) get_cpufreq() * 1000000.0);
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}
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ialias (omp_get_wtime)
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ialias (omp_get_wtick)
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