gcc/testsuite/gcc.dg/torture/pr23821.c

   1 /* { dg-do compile } */
   2 /* { dg-skip-if "" { *-*-* } { "-O0" "-fno-fat-lto-objects" } { "" } } */
   3 /* At -O1 DOM threads a jump in a non-optimal way which leads to
   4    the bogus propagation.  */
   5 /* { dg-skip-if "" { *-*-* } { "-O1" } { "" } } */
   6 /* { dg-options "-fdump-tree-ivcanon-details" } */
   7
   8 int a[199];
   9
  10 extern void abort (void);
  11
  12 int
  13 main ()
  14 {
  15   int i, x;
  16   for (i = 0; i < 199; i++)
  17     {
  18       x = a[i];
  19       if (x != i)
  20         abort ();
  21     }
  22   return 0;
  23 }
  24
  25 /* Verify that we do not propagate the equivalence x == i into the
  26    induction variable increment.  */
  27
  28 /* { dg-final { scan-tree-dump "Added canonical iv" "ivcanon" } } */