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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: Tue, 14 Dec 2021 15:08:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98782

--- Comment #28 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
(In reply to pthaugen from comment #19)
> I tried -fno-inline-functions-called-once and the patches on a Power9
> system. Following are the run times and spill counts (grep -c Spilling
> exchange2.fppized.f90.298r.ira). Interesting that the spill counts increa=
se
> when -fno-inline-functions-called-once is added, but obviously that
> additional spill is on cold paths since execution time improves. Compiler
> options used are "-O3 -mcpu=3Dpower9 -fpeel-loops -funroll-loops -ffast-m=
ath".
>=20
>                                   time(sec)      Spill
> base                                473           3284
>=20
> no-inline-functions-called-once     370           5410
>=20
> patches 1 & 2                       397            461
>=20
> patches 1 & 2
> + no-inline-functions-called-once   299            870

Ah thanks for testing!, so at least we know that all architectures are
suffering from the same underlying issue :)=