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From: "marxin 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: Mon, 31 Jan 2022 14:50:55 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94905

Martin Li=C5=A1ka <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |marxin at gcc dot gnu.org
           Keywords|needs-bisection             |

--- Comment #14 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
>=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-patterns
> -fno-tree-vectorize where we get similar IL as with GCC 11 we do not warn=
 so
> I wonder
> what fixed it on trunk (when you add those options).

It was fixed with r11-3659-gac1c65ad1a16d83e.=