[Bug target/65456] powerpc64le autovectorized copy loop missed optimization

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65456

--- Comment #11 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
(In reply to David Edelsohn from comment #10)
> I believe that the choice to scalarize is based on the vector cost model.

Hm, that would be interesting.  The applied patch changes the cost model to
favor the unaligned store on VSX.  Might be a place where it should be using
the cost model but perhaps isn't?  I'll look into it later this week.