gcc/testsuite/gcc.dg/tree-ssa/loop-10.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O1 -fdump-tree-vars" } */
   3
   4 int bar (void);
   5
   6 void foo (void)
   7 {
   8   unsigned i, j, n;
   9
  10   for (i = 0; i < 100000; i++)
  11     ;
  12
  13   n = bar ();
  14   for (i = 0; i < n; i++)
  15     ;
  16
  17   for (i = 0; i < n; i++)
  18     for (j = 0; j < n; j++)
  19       ;
  20
  21   /* These should not be removed.  */
  22   for (i = 0; i < 10000; i++)
  23     bar ();
  24
  25   for (i = 0; i != n; i += 2)
  26     ;
  27 }
  28
  29 /* { dg-final { scan-tree-dump-times "if " 3 "vars" } } */
  30 /* { dg-final { scan-tree-dump-times "bar " 2 "vars" } } */
  31
  32 /* { dg-final { cleanup-tree-dump "vars" } } */