[Bug target/104122] On Zen3, 510.parest_r (built with -Ofast) is faster with generic than with native ISA

[jamborm at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104122

--- Comment #4 from Martin Jambor <jamborm at gcc dot gnu.org> ---
(In reply to Martin Jambor from comment #3)
> (In reply to Richard Biener from comment #2)
>
> > I suppose -march=native -mtune=generic is still bad?
> 
> I don't know, I'd have to manually check.
> 

It turns out that (at least on the Ryzen machine) -march=native
-mtune=generic is actually 15% better than not using any of the two
options.