[Bug tree-optimization/65492] Bad optimization in -O3 on SSE intrinsics

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65492

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Target|                            |x86_64-*-*
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-03-20
            Version|unknown                     |5.0
     Ever confirmed|0                           |1

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Part of it is if-conversion enabled at -O3 (-fno-tree-loop-if-convert), but
then -O2 is still ~20% faster.

Confirmed.

Not sure if really caused by intrinsics.