[Bug middle-end/28367] accessing via union on a vector does not cause vec_extract to be used

["rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28367

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
         AssignedTo|unassigned at gcc dot       |rguenth at gcc dot gnu.org
                   |gnu.org                     |

--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-03-16 11:41:03 UTC ---
comment #1 is fixed, the original problem persists.  optimized dump:

;; Function f (f)

f (vector(4) float t)
{
  union
  {
    vector(4) float t1;
    float t2[4];
  } t5;
  float D.2687;

<bb 2>:
  t5.t1 = t_1(D);
  D.2687_2 = t5.t2[0];
  return D.2687_2;

}

FRE does not know how to handle different sizes in its support for
type-punning stores/loads (visit_reference_op_load).

Mine.