gcc/testsuite/gcc.dg/tree-ssa/loop-interchange-11.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -floop-interchange -fdump-tree-linterchange-details" } */
   3
   4 #define M 256
   5 int a[M][M], b[M][M];
   6
   7 void
   8 simple_reduc_1 (int n, int *p)
   9 {
  10   for (int j = 0; j < n; j++)
  11     {
  12       int sum = p[j];
  13       for (int i = 0; i < n; i++)
  14         {
  15           sum = sum + b[i][j];
  16           b[i][j] += a[i][j];
  17         }
  18
  19       p[j] = sum;
  20     }
  21 }
  22 /* { dg-final { scan-tree-dump-not "Loop_pair<outer:., inner:.> is interchanged" "linterchange" } } */