/*******************************************************************************/
/* Loops permutation
   =================
   
   Compile with: gcc44 -march=core2 -O3 -ftree-vectorizer-verbose=2
                 icc -march=core2
                 icc -march=core2 -O3
   
******************************************************************************/   


# include <stdio.h>
# include <time.h>

#define N 10000

int main()
{  int i,j;
   static double x[N],b[N],A[N][N];
   clock_t clock0, clock1;

   for (i=0; i<N; i++) 
   {  x[i]=1; b[i]=0;}
   
   for (i=0; i<N; i++) 
     for (j=0; j<N; j++) A[i][j]=i+j;
   
/* Multiplication by columns
   *************************/
    
   clock0 = clock();
   .....
   ..... 
   clock1 = clock();
   printf("Columns CPU time was:  %g miliseconds.\n",
        (1000*(double)(clock1 - clock0))/CLOCKS_PER_SEC);

/* Multiplication by rows
   ***********************/
    
   clock0 = clock();
   .....
   ..... 
   clock1 = clock();
   printf("Rows CPU time was:  %g miliseconds.\n",
        (1000*(double)(clock1 - clock0))/CLOCKS_PER_SEC);
        
   return 0;
    
}