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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/101210] [9/10/11/12 regression] spurious "reference binding
 to misaligned address" ubsan error for integer comparison
Date: Fri, 25 Jun 2021 16:50:33 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101210

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[7/8/9/10/11/12 regression] |[9/10/11/12 regression]
                   |spurious "reference binding |spurious "reference binding
                   |to misaligned address"      |to misaligned address"
                   |ubsan error for integer     |ubsan error for integer
                   |comparison                  |comparison
                 CC|                            |jakub at gcc dot gnu.org
   Target Milestone|---                         |9.5

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I think this is caused by the PR70920 fix
r7-2226-g8f63caf6826e918678482413161e34b037a13fa7
We have (long) y =3D=3D 1 where y has REFERENCE_TYPE and that match.pd
rule transforms it into y =3D=3D 1 where 1 has also that REFERENCE_TYPE.
As ubsan instrumentation happens on partially GENERIC folded trees, doing t=
hat
in GENERIC for REFERENCE_TYPE is wrong, we should defer it to GIMPLE.=