www/experiments/matmul/matmul.c

   1 #include <stdio.h>
   2
   3 #define N 1536
   4 float A[N][N];
   5 float B[N][N];
   6 float C[N][N];
   7
   8 void init_array()
   9 {
  10     int i, j;
  11
  12     for (i = 0; i < N; i++) {
  13         for (j = 0; j < N; j++) {
  14             A[i][j] = (1+(i*j)%1024)/2.0;
  15             B[i][j] = (1+(i*j)%1024)/2.0;
  16         }
  17     }
  18 }
  19
  20 void print_array()
  21 {
  22     int i, j;
  23
  24     for (i = 0; i < N; i++) {
  25         for (j = 0; j < N; j++) {
  26             fprintf(stdout, "%lf ", C[i][j]);
  27             if (j%80 == 79) fprintf(stdout, "\n");
  28         }
  29         fprintf(stdout, "\n");
  30     }
  31 }
  32
  33 int main()
  34 {
  35     int i, j, k;
  36     double t_start, t_end;
  37
  38     init_array();
  39
  40     for (i = 0; i < N; i++) {
  41         for (j = 0; j < N; j++) {
  42             C[i][j] = 0;
  43             for (k = 0; k < N; k++)
  44                 C[i][j] = C[i][j] + A[i][k] * B[k][j];
  45         }
  46     }
  47
  48 #ifdef TEST
  49     print_array();
  50 #endif
  51     return 0;
  52 }