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From: "aldyh 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: Sun, 21 Nov 2021 19:37:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103088

--- Comment #21 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
One last comment.

A smaller hammer than -fno-unsafe-math-optimizations may be
-fno-finite-math-only which allows for the problematic NAN behavior in
Perl_do_ncmp.  Allowing for the inlining, but not munging the comparisons. =
 For
that matter, the test passes for ref with it.

Though someone more knowledgeable with perl+math should opine here.  I don't
know if NAN / INF are the only issues in this test wrt -ffast-math.=