7.1.5.1.1 : Le main_cpp20.cpp
Comme toujours, on commence pas les includes : 
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#include <iostream>
#include <vector>

#include <algorithm>
//Some doc at : https://en.cppreference.com/w/cpp/header/execution
#include <execution>

#include "asterics_hpc.h"

///Do the Hadamard product
/**	@param[out] vecRes : vector of results of tabX*tabY
 * 	@param vecX : input vector
 * 	@param vecY : input vector
*/
void hadamard_product(std::vector<float> & vecRes, const std::vector<float> & vecX, const std::vector<float> & vecY){
	std::transform(EXECUTION_POLICY, std::begin(vecX), std::end(vecX), std::begin(vecY), std::begin(vecRes),
			[](float xi, float yi){ return xi * yi; });
}

///Get the number of cycles per elements of the Hadamard product
/**	@param nbElement : number of elements of the tables
 * 	@param nbRepetition : number of repetition to evaluate the function hadamard_product
*/
void evaluateHadamardProduct(long unsigned int nbElement, long unsigned int nbRepetition){


On déclare nos tableaux et on les initialise : 
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	std::vector<float> vecX, vecY, vecRes;
	vecRes.resize(nbElement);
	for(size_t i(0lu); i < nbElement; ++i){
		vecX.push_back(i*32lu%17lu);
		vecY.push_back(i*57lu%31lu);
	}
	float res(0.0f);
	//Stating the timer
	long unsigned int beginTime(rdtsc());
	for(long unsigned int i(0lu); i < nbRepetition; ++i){
		hadamard_product(vecRes, vecX, vecY);
		res += vecRes[0];
	}
	//Get the time of the nbRepetition calls
	long unsigned int elapsedTime((double)(rdtsc() - beginTime)/((double)nbRepetition));
	double cyclePerElement(((double)elapsedTime)/((double)nbElement));
	std::cout << "evaluateHadamardProduct C++20 : nbElement = "<<nbElement<<", cyclePerElement = " << cyclePerElement << " cy/el, elapsedTime = " << elapsedTime << " cy, res = " << res << std::endl;
	std::cerr << nbElement << "\t" << cyclePerElement << "\t" << elapsedTime << std::endl;
}


Ensuite, la fonction main : 
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int main(int argc, char** argv){
	std::cout << "Hadamard product C++ 20" << std::endl;
	evaluateHadamardProduct(1000lu, 1000000lu);
	evaluateHadamardProduct(2000lu, 1000000lu);
	evaluateHadamardProduct(3000lu, 1000000lu);
	evaluateHadamardProduct(5000lu, 1000000lu);
	evaluateHadamardProduct(10000lu, 1000000lu);
	return 0;
}


Le main_cpp20.cpp complet : 
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/***************************************
	Auteur : Pierre Aubert
	Mail : pierre.aubert@lapp.in2p3.fr
	Licence : CeCILL-C
****************************************/
#include <iostream>
#include <vector>

#include <algorithm>
//Some doc at : https://en.cppreference.com/w/cpp/header/execution
#include <execution>

#include "asterics_hpc.h"

///Do the Hadamard product
/**	@param[out] vecRes : vector of results of tabX*tabY
 * 	@param vecX : input vector
 * 	@param vecY : input vector
*/
void hadamard_product(std::vector<float> & vecRes, const std::vector<float> & vecX, const std::vector<float> & vecY){
	std::transform(EXECUTION_POLICY, std::begin(vecX), std::end(vecX), std::begin(vecY), std::begin(vecRes),
			[](float xi, float yi){ return xi * yi; });
}

///Get the number of cycles per elements of the Hadamard product
/**	@param nbElement : number of elements of the tables
 * 	@param nbRepetition : number of repetition to evaluate the function hadamard_product
*/
void evaluateHadamardProduct(long unsigned int nbElement, long unsigned int nbRepetition){
		std::vector<float> vecX, vecY, vecRes;
	vecRes.resize(nbElement);
	for(size_t i(0lu); i < nbElement; ++i){
		vecX.push_back(i*32lu%17lu);
		vecY.push_back(i*57lu%31lu);
	}
	float res(0.0f);
	//Stating the timer
	long unsigned int beginTime(rdtsc());
	for(long unsigned int i(0lu); i < nbRepetition; ++i){
		hadamard_product(vecRes, vecX, vecY);
		res += vecRes[0];
	}
	//Get the time of the nbRepetition calls
	long unsigned int elapsedTime((double)(rdtsc() - beginTime)/((double)nbRepetition));
	double cyclePerElement(((double)elapsedTime)/((double)nbElement));
	std::cout << "evaluateHadamardProduct C++20 : nbElement = "<<nbElement<<", cyclePerElement = " << cyclePerElement << " cy/el, elapsedTime = " << elapsedTime << " cy, res = " << res << std::endl;
	std::cerr << nbElement << "\t" << cyclePerElement << "\t" << elapsedTime << std::endl;
}

int main(int argc, char** argv){
	std::cout << "Hadamard product C++ 20" << std::endl;
	evaluateHadamardProduct(1000lu, 1000000lu);
	evaluateHadamardProduct(2000lu, 1000000lu);
	evaluateHadamardProduct(3000lu, 1000000lu);
	evaluateHadamardProduct(5000lu, 1000000lu);
	evaluateHadamardProduct(10000lu, 1000000lu);
	return 0;
}
Le fichier main_cpp20.cpp est disponible ici.