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From: "aoliva at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/105665] [12/13 Regression] wrong code at -Os
 and above on x86_64-linux-gnu since r12-397-gda9e6e63d1ae22
Date: Sat, 28 May 2022 00:17:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105665

Alexandre Oliva <aoliva at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |aoliva at gcc dot g=
nu.org

--- Comment #5 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Mine.  The problem is that the undef name may appear deep in a chain of phi=
s,
instead of appearing directly in the base expr.=