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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/94905] [10/11 Regression] Bogus warning
 -Werror=maybe-uninitialized
Date: Thu, 07 Apr 2022 09:39:33 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94905

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |needs-bisection

--- Comment #15 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Martin Li=C5=A1ka from comment #14)
> >=20
> > and the partial uninitialized read from it is not what the uninit pass =
can
> > diagnose (it's memory walking stops at the first may-def, it does not
> > prune must-def ranges).  But even with -fno-tree-loop-distribute-patter=
ns
> > -fno-tree-vectorize where we get similar IL as with GCC 11 we do not wa=
rn so
> > I wonder
> > what fixed it on trunk (when you add those options).
>=20
> It was fixed with r11-3659-gac1c65ad1a16d83e.

But the original testcase still warns on the branch but not trunk, so that
cannot be it.=