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From: "tnfchris at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/103088] [12 regression] 500.perlbench from
 spec 2017 fails since r12-4698
Date: Thu, 18 Nov 2021 16:45:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103088

--- Comment #8 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
(In reply to Aldy Hernandez from comment #7)
> Could someone post the relevant configury bits used for the ppc64le case.
>=20
> I used:
>=20
> runcpu --config=3Dmyconfig -a validate --iterations=3D1  --ignore-errors
> --rebuild --noreportable -i test --tune=3Dbase 500.perlbench
>=20

The test dataset has extra checks that check differences between signed and
unsigned zero which -ffast-math turns on and `-fno-unsafe-math-optimization=
s`
doesn't turn off.  You'll want to do a ref run instead,

so either `-i ref` or just drop the `-i` entirely, since you've already
specified `--noreportable` it won't do the `train and ref` automatically.  =
The
test dataset is also likely too small to show the issue.=