PFunctionTimer_impl.h

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/***************************************
        Auteur : Pierre Aubert
        Mail : pierre.aubert@lapp.in2p3.fr
        Licence : CeCILL-C
****************************************/
 
#ifndef __PFUNCTIONTIMER_IMPL_H__
#define __PFUNCTIONTIMER_IMPL_H__
 
#include "pin_thread_to_core.h"
#include "micro_benchmark_ns.h"
#include "PFunctionTimer.h"


template <class T>
[[gnu::always_inline]] inline void benchmark_doNotOptimize(T & value) {
#if defined(__clang__)
        asm volatile("" : "+r,m"(value) : : "memory");
#else
        asm volatile("" : "+m,r"(value) : : "memory");
#endif
}


template<typename _Callable, typename... _Args>
void PFunctionTimer::evalPerf(_Callable&& __f, _Args&&... __args){
        PIN_THREAD_TO_CORE
        int dummy = 0;
        ::benchmark_doNotOptimize(dummy);
        for(size_t i(0lu); i < p_nbMeasure; ++i){
                //Start chrono
                HiPeTime startNs = phoenix_getTime();
                size_t startCy = phoenix_rdtsc();
                //Call function
                ::benchmark_doNotOptimize(dummy);
                __f(__args...);
                //Compute ellapsed time
                size_t ellapsedTimeCy(phoenix_rdtsc() - startCy);
                p_vecEllapsedTimeNs[i] = (double)ellapsedTimeCy;
                NanoSecs elapsedTimeNs(phoenix_getTime() - startNs);
                double fullNs((double)elapsedTimeNs.count());
                p_vecEllapsedTimeCycle[i] = fullNs;
        }
}
 
//{Finally we close the header :
#endif