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From: "marxin 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: Fri, 19 Nov 2021 11:40:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103088

--- Comment #14 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
> > Richi the configury bits you shared once upon a time had
> > -fno-unsafe-math-optimizations for 500.perlbench.  Are there known issu=
es with
> > this test for -ffast-math that we had -fno-unsafe-math-optimizations?
>=20
> Indeed - interesting.  I don't remember anything and I have originally
> copied this config from our testers which means iff then maybe
> Martin knows ... ;)

Yes, I can confirm we have=20

   EXTRA_OPTIMIZE      =3D -fno-strict-aliasing -fno-unsafe-math-optimizati=
ons

for perlbench benchmark. It's also mentioned in portability Issues:
https://www.spec.org/cpu2017/Docs/benchmarks/500.perlbench_r.html

```
3. GCC -Ofast and unsafe math: Users of GCC's -Ofast option may encounter
problems with the test workload failing to validate. If you go to the run
directory and look at file test.out.mis, you may see output such as:
...
```

So I would close this as invalid as it's a known limitation.=