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

   1 /* { dg-do compile } */
   2 /* { dg-options "-O1 -fdump-tree-fab" } */
   3
   4 /* Check that we fold strlen of equally long strings, and that we do not
   5    fail to terminate when there is a nontrivial cycle in the corresponding
   6    ssa graph.  */
   7
   8 extern __SIZE_TYPE__ strlen (const char *);
   9
  10 void foo(int i)
  11 {
  12   char *s = "abcde";
  13
  14   if (i)
  15     {
  16       s = "defgh";
  17       goto middle;
  18     }
  19
  20 start:
  21
  22   bla ();
  23
  24 middle:
  25
  26   if (bla ())
  27     goto start;
  28
  29   bar (strlen (s));
  30 }
  31
  32 /* There should be no calls to strlen.  */
  33 /* { dg-final { scan-tree-dump-times "strlen" 0 "fab"} } */
  34 /* { dg-final { cleanup-tree-dump "fab" } } */