[Bug target/54349] _mm_cvtsi128_si64 unnecessary stores value at stack

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54349

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |jakub at gcc dot gnu.org
         Resolution|                            |INVALID

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-08-22 14:57:54 UTC ---
Not a bug.  You need to tune for a CPU where inter-unit moves are desirable. 
The default is generic tuning, which is a compromise between Intel CPUs (where
they are desirable) and AMD CPUs (where they are undesirable).  In this
particular case the generic tuning doesn't do inter-unit moves as part of the
compromise.  If you -mtune=corei7 or similar, you'll get an inter-unit move in
both cases.