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      1 // g++ -fopenmp -I .. -O3 -DNDEBUG -finline-limit=1000 benchmarkX.cpp -o b && time ./b
      2 
      3 #include <iostream>
      4 
      5 #include <Eigen/Core>
      6 
      7 using namespace std;
      8 using namespace Eigen;
      9 
     10 #ifndef MATTYPE
     11 #define MATTYPE MatrixXLd
     12 #endif
     13 
     14 #ifndef MATSIZE
     15 #define MATSIZE 400
     16 #endif
     17 
     18 #ifndef REPEAT
     19 #define REPEAT 100
     20 #endif
     21 
     22 int main(int argc, char *argv[])
     23 {
     24 	MATTYPE I = MATTYPE::Ones(MATSIZE,MATSIZE);
     25 	MATTYPE m(MATSIZE,MATSIZE);
     26 	for(int i = 0; i < MATSIZE; i++) for(int j = 0; j < MATSIZE; j++)
     27 	{
     28 		m(i,j) = (i+j+1)/(MATSIZE*MATSIZE);
     29 	}
     30 	for(int a = 0; a < REPEAT; a++)
     31 	{
     32 		m = I + 0.0001 * (m + m*m);
     33 	}
     34 	cout << m(0,0) << endl;
     35 	return 0;
     36 }
     37