gcc/testsuite/gcc.dg/tree-ssa/ssa-pre-15.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-optimized" } */
   3
   4 /* Verify we PRE the strlen call, as strlen("") folds to zero.  */
   5
   6 extern __SIZE_TYPE__ strlen (const char *);
   7
   8 __SIZE_TYPE__ mystrlen (const char *s)
   9 {
  10   if (!s)
  11     s = "";
  12   return strlen(s);
  13 }
  14
  15 /* { dg-final { scan-tree-dump "= 0;" "optimized" } } */
  16 /* { dg-final { cleanup-tree-dump "optimized" } } */