gcc/testsuite/gcc.dg/tree-ssa/ssa-pre-8.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fno-tree-dominator-opts -fdump-tree-fre1-stats" } */
   3 struct s {
   4       int *n;
   5 };
   6
   7 int
   8 foo (__SIZE_TYPE__ i, struct s *array)
   9 {
  10   int *p = array[i].n;
  11   if (p)
  12     {
  13       int *q = array[i].n;
  14       if (p != q)
  15         return 1;
  16     }
  17   return 0;
  18 }
  19 /* We should eliminate two address calculations, and one load.  */
  20 /* We also elimiate the PHI node feeding the return because the case
  21    returning 1 is unreachable.  */
  22 /* We used to eliminate a cast but that was before POINTER_PLUS_EXPR
  23    was added.  */
  24 /* { dg-final { scan-tree-dump-times "Eliminated: 4" 1 "fre1"} } */