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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/101909] 73% regression on tfft benchmark for
 -O2 -ftree-loop-vectorize compared to -O2 on zen hardware
Date: Mon, 16 Aug 2021 09:56:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101909

--- Comment #4 from rguenther at suse dot de <rguenther at suse dot de> ---
On Mon, 16 Aug 2021, marxin at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101909
>=20
> Martin Li=C5=A1ka <marxin at gcc dot gnu.org> changed:
>=20
>            What    |Removed                     |Added
> -------------------------------------------------------------------------=
---
>                  CC|                            |marxin at gcc dot gnu.org
>=20
> --- Comment #3 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
> (In reply to Jan Hubicka from comment #2)
> > > So that's znver1 (split AVX IIRC) compared to znver2?
> > Martin will know how to decode machine names.  I am never sure.
> > It is with generic, so split AVX does not make difference.
> >=20
> > Honza
>=20
> zenith:
> https://lnt.opensuse.org/db_default/v4/SPEC/machine/376
>=20
> benzen:
> https://lnt.opensuse.org/db_default/v4/SPEC/machine/393

So indeed zenith is znver1 and benzen znver2.  But yeah, with
generic -O2 we don't use AVX.=