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loop.c
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loop.c
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/*
* ftalat - Frequency Transition Latency Estimator
* Copyright (C) 2013 Universite de Versailles
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "loop.h"
#include <stdio.h>
#include "rdtsc.h"
const unsigned int NB_ITER = 30L;
#define asmLoop()\
{\
asm volatile(\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
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"addl $1,%%eax;\n\t"\
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"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
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"addl $1,%%eax;\n\t"\
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"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
"addl $1,%%eax;\n\t"\
:\
:\
:"%eax"\
);\
}
__inline__ unsigned long loop()
{
unsigned long long startTime = 0;
unsigned long long endTime = 0;
unsigned int i = 0;
//sync_rdtscll(startTime);
sync_rdtsc1(startTime);
for ( i = 0 ; i < 8; i++ )
asmLoop();
sync_rdtsc2(endTime);
//sync_rdtscll(endTime);
return (unsigned long) (endTime - startTime);
}