Chapter 1.1 : The main.cpp file
First, we have to include the appropriate files :
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#include <iostream>
using namespace std;
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Then, we define our hadamard kernel :
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///Do the Hadamard product
/** @param[out] tabResult : table of results of tabX*tabY
* @param tabX : input table
* @param tabY : input table
* @param nbElement : number of elements in the tables
*/
void hadamard_product(float* tabResult, const float* tabX, const float* tabY, long unsigned int nbElement){
for(long unsigned int i(0lu); i < nbElement; ++i){
tabResult[i] = tabX[i]*tabY[i];
}
}
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We add the function to evaluate our kernel :
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///Get the number of cycles per elements of the Hadamard product
/** @param nbElement : number of elements of the tables
*/
void evaluateHadamardProduct(long unsigned int nbElement){
float * tabResult = new float[nbElement];
float * tabX = new float[nbElement];
float * tabY = new float[nbElement];
for(long unsigned int i(0lu); i < nbElement; ++i){
tabX[i] = (float)(i*32lu%17lu);
tabY[i] = (float)(i*57lu%31lu);
}
hadamard_product(tabResult, tabX, tabY, 4000lu);
cout << "tabResult[0] = " << tabResult[0] << endl;
delete[] tabResult;
delete[] tabX;
delete[] tabY;
}
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Finally, we call the function to evaluate several points in order to make plots :
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int main(int argc, char** argv){
cout << "Hadamard product" << endl;
evaluateHadamardProduct(1000lu);
evaluateHadamardProduct(2000lu);
evaluateHadamardProduct(3000lu);
evaluateHadamardProduct(5000lu);
evaluateHadamardProduct(10000lu);
return 0;
}
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The full
main.cpp file :
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/***************************************
Auteur : Pierre Aubert
Mail : aubertp7@gmail.com
Licence : CeCILL-C
****************************************/
#include <iostream>
using namespace std;
///Do the Hadamard product
/** @param[out] tabResult : table of results of tabX*tabY
* @param tabX : input table
* @param tabY : input table
* @param nbElement : number of elements in the tables
*/
void hadamard_product(float* tabResult, const float* tabX, const float* tabY, long unsigned int nbElement){
for(long unsigned int i(0lu); i < nbElement; ++i){
tabResult[i] = tabX[i]*tabY[i];
}
}
///Get the number of cycles per elements of the Hadamard product
/** @param nbElement : number of elements of the tables
*/
void evaluateHadamardProduct(long unsigned int nbElement){
float * tabResult = new float[nbElement];
float * tabX = new float[nbElement];
float * tabY = new float[nbElement];
for(long unsigned int i(0lu); i < nbElement; ++i){
tabX[i] = (float)(i*32lu%17lu);
tabY[i] = (float)(i*57lu%31lu);
}
hadamard_product(tabResult, tabX, tabY, 4000lu);
cout << "tabResult[0] = " << tabResult[0] << endl;
delete[] tabResult;
delete[] tabX;
delete[] tabY;
}
int main(int argc, char** argv){
cout << "Hadamard product" << endl;
evaluateHadamardProduct(1000lu);
evaluateHadamardProduct(2000lu);
evaluateHadamardProduct(3000lu);
evaluateHadamardProduct(5000lu);
evaluateHadamardProduct(10000lu);
return 0;
}
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You can get the file
here.