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// 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;
}
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