gcc/testsuite/gcc.dg/tree-ssa/pr100794.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -ftree-loop-vectorize -fdump-tree-pcom-details -fdisable-tree-vect" } */
   3
   4 extern double arr[100];
   5 extern double foo (double, double);
   6 extern double sum;
   7
   8 void
   9 test (int i_0, int i_n)
  10 {
  11   int i;
  12   for (i = i_0; i < i_n - 1; i++)
  13     {
  14       double a = arr[i];
  15       double b = arr[i + 1];
  16       sum += a * b;
  17     }
  18 }
  19
  20 /* { dg-final { scan-tree-dump "Executing predictive commoning without unrolling" "pcom" } } */