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/*************************************** Auteur : Pierre Aubert Mail : aubertp7@gmail.com Licence : CeCILL-C ****************************************/ //AVX intrinsic functions #include <immintrin.h> #include <iostream> #include "asterics_hpc.h" 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){ long unsigned int vecSize(VECTOR_ALIGNEMENT/sizeof(float)); long unsigned int nbVec(nbElement/vecSize); for(long unsigned int i(0lu); i < nbVec; ++i){ __m256 vecX = _mm256_load_ps(tabX + i*vecSize); __m256 vecY = _mm256_load_ps(tabY + i*vecSize); __m256 vecRes = _mm256_mul_ps(vecX, vecY); _mm256_store_ps(tabResult + i*vecSize, vecRes); } } ///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){ float * tabResult = (float*)asterics_malloc(sizeof(float)*nbElement); float * tabX = (float*)asterics_malloc(sizeof(float)*nbElement); float * tabY = (float*)asterics_malloc(sizeof(float)*nbElement); for(long unsigned int i(0lu); i < nbElement; ++i){ tabX[i] = (float)(i*32lu%17lu); tabY[i] = (float)(i*57lu%31lu); } long unsigned int beginTime(rdtsc()); for(long unsigned int i(0lu); i < nbRepetition; ++i){ hadamard_product(tabResult, tabX, tabY, nbElement); } long unsigned int elapsedTime((double)(rdtsc() - beginTime)/((double)nbRepetition)); double cyclePerElement(((double)elapsedTime)/((double)(nbElement))); cout << "evaluateHadamardProduct : nbElement = "<<nbElement<<", cyclePerElement = " << cyclePerElement << " cy/el, elapsedTime = " << elapsedTime << " cy" << endl; cerr << nbElement << "\t" << cyclePerElement << "\t" << elapsedTime << endl; asterics_free(tabResult); asterics_free(tabX); asterics_free(tabY); } int main(int argc, char** argv){ cout << "Hadamard product intrinsics" << endl; evaluateHadamardProduct(1000lu, 5000000lu); evaluateHadamardProduct(1600lu, 5000000lu); evaluateHadamardProduct(2000lu, 5000000lu); evaluateHadamardProduct(2400lu, 5000000lu); evaluateHadamardProduct(2664lu, 3000000lu); evaluateHadamardProduct(3000lu, 3000000lu); evaluateHadamardProduct(4000lu, 3000000lu); evaluateHadamardProduct(5000lu, 1000000lu); evaluateHadamardProduct(10000lu, 1000000lu); return 0; } |
Previous The main function |
Parent Manual vectorization (by Intrinsic functions) |
Outline | Next The CMakeLists.txt file |