// g++ -O3 -DNDEBUG benchmarkX.cpp -o benchmarkX && time ./benchmarkX | |
#include <iostream> | |
#include <Eigen/Core> | |
using namespace std; | |
using namespace Eigen; | |
#ifndef VECTYPE | |
#define VECTYPE VectorXLd | |
#endif | |
#ifndef VECSIZE | |
#define VECSIZE 1000000 | |
#endif | |
#ifndef REPEAT | |
#define REPEAT 1000 | |
#endif | |
int main(int argc, char *argv[]) { | |
VECTYPE I = VECTYPE::Ones(VECSIZE); | |
VECTYPE m(VECSIZE, 1); | |
for (int i = 0; i < VECSIZE; i++) { | |
m[i] = 0.1 * i / VECSIZE; | |
} | |
for (int a = 0; a < REPEAT; a++) { | |
m = VECTYPE::Ones(VECSIZE) + 0.00005 * (m.cwise().square() + m / 4); | |
} | |
cout << m[0] << endl; | |
return 0; | |
} |