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References: <bug-45522-176@http.gcc.gnu.org/bugzilla/>
Subject: [Bug tree-optimization/45522] VRP misses oppurtunity for statement folding.
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------- Comment #4 from hubicka at gcc dot gnu dot org  2010-09-03 20:04 -------
A related testcase where we fail to fold fundamentals[0]
typedef union tree_node *tree;
enum tree_code
{
  OFFSET_TYPE, ENUMERAL_TYPE, BOOLEAN_TYPE, POINTER_TYPE, FIXED_POINT_TYPE,
};
struct tree_base
{
  unsigned public_flag:1;
};
struct tree_decl_with_vis
{
  unsigned comdat_flag:1;
};
union tree_node
{
  struct tree_base base;
  struct tree_decl_with_vis decl_with_vis;
};
enum tree_index
{
    TI_LONG_DOUBLE_PTR_TYPE, TI_INTEGER_PTR_TYPE, TI_VOID_TYPE, TI_PTR_TYPE,
    TI_VA_LIST_FPR_COUNTER_FIELD, TI_BOOLEAN_TYPE, TI_FILEPTR_TYPE,
    TI_CURRENT_TARGET_PRAGMA, TI_CURRENT_OPTIMIZE_PRAGMA, TI_MAX
};
extern tree global_trees[TI_MAX];
emit_support_tinfos (void)
{
  static tree *const fundamentals[] = {
    &global_trees[TI_VOID_TYPE], &global_trees[TI_BOOLEAN_TYPE],
  };
  int ix;
  for (ix = 0; fundamentals[ix]; ix++)
    {
        {
          tree tinfo;
            {
              ((void) (!(((tinfo)->base.public_flag) && !(__extension__ (
                                                                          {
                                                                         
__typeof
                                                                         
(tinfo)
                                                                          __t
                                                                          =
                                                                         
(tinfo);
                                                                          __t;}
                                                          )->decl_with_vis.
                                                          comdat_flag)) ?
                       fancy_abort ("../../gcc/cp/rtti.c", 1529,
                                    __FUNCTION__), 0 : 0));
            }
        }
    }
}


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45522