gcc/testsuite/g++.dg/tree-ssa/copyprop-1.C

   1 /* { dg-do compile } */
   2 /* { dg-options "-O -fdump-tree-dce2" } */
   3
   4 /* Verify that we can eliminate the useless conversions to/from
   5    const qualified pointer types
   6      this_2 = o_1;
   7      D.20003_4 = this_2->data_m;
   8      this_5 = D.20003_4;
   9      D.20005_6 = this_5->value;
  10    copyprop should propagate o_1 and D.20003_4 to the loads of data_m
  11    and value.  dce removes all traces of this.  */
  12
  13 struct Data {
  14   int get() const { return value; }
  15   int value;
  16 };
  17
  18 struct Object {
  19   int operator[](int i) const { return data_m->get(); }
  20   Data *data_m;
  21 };
  22
  23 int foo(Object&o)
  24 {
  25   return o[0];
  26 }
  27
  28 /* { dg-final { scan-tree-dump-not ".* = \[^>;\]*;" "dce2" { xfail *-*-* } } } */
  29 /* { dg-final { cleanup-tree-dump "dce2" } } */