[Bug rtl-optimization/84753] GCC does not fold xxswapd followed by vperm

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84753

Bill Schmidt <wschmidt at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-03-08
     Ever confirmed|0                           |1

--- Comment #6 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
We should keep this issue open for a different problem, though.  When swap
optimization doesn't succeed on such a loop, we don't end up optimizing away
the xxlnand associated with the vperm on Power8.  Currently that is only done
as part of swap optimization.  It's a minor savings but worth doing.