gcc/testsuite/gcc.dg/tree-ssa/predcom-3.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fpredictive-commoning -fdump-tree-pcom-details" } */
   3
   4 int a[1000], b[1000];
   5
   6 void test(void)
   7 {
   8   int i;
   9
  10   for (i = 1; i < 999; i++)
  11     b[i] = (a[i + 1] + a[i] + a[i - 1]) / 3;
  12 }
  13
  14 /* Verify that we used 3 temporary variables for the loop.  */
  15 /* { dg-final { scan-tree-dump-times "Unrolling 3 times." 1 "pcom"} } */
  16 /* { dg-final { cleanup-tree-dump "pcom" } } */