gcc/testsuite/gcc.dg/loop-unswitch-4.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -funswitch-loops" } */
   3
   4 #include <stdlib.h>
   5 __attribute__ ((noinline))
   6 void foo (float **a, float **b, float *c, int n, int m, int l)
   7 {
   8   int i,j,k;
   9   float s;
  10   for (i=0; i<l; i++)
  11     for (j=0; j<n; j++)
  12       for (k=0; k<m; k++)
  13         c[i] += a[i][k] * b[k][j];
  14 }
  15
  16 int main()
  17 {
  18   const int N = 32;
  19   float **ar1, **ar2;
  20   float *res;
  21   int i, j;
  22   ar1 = (float **)malloc (N * sizeof (float*));
  23   ar2 = (float **)malloc (N * sizeof (float*));
  24   res = (float *)malloc( N * sizeof (float));
  25   for (i=0; i<N; i++)
  26     {
  27       ar1[i] = (float*)malloc (N * sizeof (float));
  28       ar2[i] = (float*)malloc (N * sizeof (float));
  29     }
  30   for (i=0; i<N; i++)
  31     {
  32       for (j=0; j<N; j++)
  33         {
  34           ar1[i][j] = 2.0f;
  35           ar2[i][j] = 1.5f;
  36         }
  37       res[i] = 0.0f;
  38     }
  39   foo (ar1, ar2, res, N, N, N);
  40   for (i=0; i<N; i++)
  41     if (res[i] != 3072.0f)
  42       abort();
  43   for (i=0; i<N; i++)
  44     res[i] = 0.0f;
  45   foo (ar1, ar2, res, N, 0, N);
  46   for (i=0; i<N; i++)
  47     if (res[i] != 0.0f)
  48       abort();
  49
  50   return 0;
  51 }
  52