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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/100152] [10/11/12 Regression] used caller-saved register
 not preserved across a call.
Date: Fri, 23 Apr 2021 12:34:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100152

--- Comment #38 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #37)
> Oh, and FYI a cc1 cross from x86_64 to x86_64-apple-darwin19.6.0 doesn't =
seem
> to reproduce the issue with the reduced testcase (I seee no call to
> ___UTF_8_put remaining with -O3 -fPIC -fno-strict-aliasing -fwrapv).

I think my interestingness test isn't strict enough - the creduced code
resulting doesn't have an extern for ___UTF_8_put and only seems to not inl=
ine
that fn because the interface has been mangled. [ so that the fn is
legitimately binds_localP as the pasted case ].

if you still have the build around, out of curiosity, does it fail on the
original .i file attached here?

and with -fno-trapping-math -fno-math-errno -fschedule-insns2
-fomit-frame-pointer

( I only need O2 to get a fail ).=