[Bug tree-optimization/46284] Lack of proper optimization for certain SSE operations, and weird behavior with similar source codes

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46284

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Target|win32                       |i?86-*-*
          Component|c++                         |tree-optimization
               Host|win32                       |

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2010-11-02 
23:54:54 UTC ---
There are multiple issues that GCC does not optimize this correctly.  First of
the problem that the unions does not cause a bit field reference to happen, see
PR 28367.  Then not combining the bit field references together.