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From: "tnfchris at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/98782] [11/12 Regression] Bad interaction
 between IPA frequences and IRA resulting in spills due to changes in BB
 frequencies
Date: Wed, 15 Dec 2021 12:15:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98782

--- Comment #30 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
(In reply to Martin Jambor from comment #29)
> (In reply to Tamar Christina from comment #23)
> > I wonder if we can get rid of the final magic parameter too, we run with
> > --param ipa-cp-unit-growth=3D80 too which seems to have no more effect =
on
> > exchange, though still a slight effect on leela but a 12% gain in imagi=
ck.
> >=20
> > This looks like without the parameter we lose constprop on MorphologyAp=
ply
> > resulting in a much bigger function.  Do you want me to make a new tick=
et
> > for this?
>=20
> Indeed I did not know about this.  I think tracking it in a (separate) PR
> would make sense.  Thanks a lot for the pointer!

Thanks, created a new ticket
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103734 the threshold seems t=
o be a
lot lower than 80%, 20% seems to already be enough.=