[Bug tree-optimization/61301] missed optimization of move if vector passed by reference

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61301

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-05-26
                 CC|                            |rguenth at gcc dot gnu.org,
                   |                            |thomas.preudhomme at arm dot 
com
     Ever confirmed|0                           |1
           Severity|normal                      |enhancement

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
  _3 = MEM[(const float *)this_1(D) + 4B];
  _4 = MEM[(const float *)this_1(D)];
  _5 = MEM[(const float *)this_1(D) + 12B];
  _6 = MEM[(const float *)this_1(D) + 8B];
  _7 = {_3, _4, _5, _6};
  return _7;

does look like an opportunity for a bswap pass improvement.  Basically
handle CONSTRUCTOR as supported composition operation (and then support
vector loads and shuffle, of course).