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Subject: [Bug c++/101210] [9/10 regression] spurious "reference binding to
 misaligned address" ubsan error for integer comparison
Date: Tue, 10 May 2022 08:19:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101210

--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Jakub Jelinek
<jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:208ad9a001f192c763e2c9682a4c296b4696a10c

commit r10-10628-g208ad9a001f192c763e2c9682a4c296b4696a10c
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Jun 29 11:24:38 2021 +0200

    match.pd: Avoid (intptr_t)x eq/ne CST to x eq/ne (typeof x) CST opt in
GENERIC when sanitizing [PR101210]

    When we have (intptr_t) x =3D=3D cst where x has REFERENCE_TYPE, this
    optimization creates x =3D=3D cst out of it where cst has REFERENCE_TYP=
E.
    If it is done in GENERIC folding, it can results in ubsan failures
    where the INTEGER_CST with REFERENCE_TYPE is instrumented.

    Fixed by deferring it to GIMPLE folding in this case.

    2021-06-29  Jakub Jelinek  <jakub@redhat.com>

            PR c++/101210
            * match.pd ((intptr_t)x eq/ne CST to x eq/ne (typeof x) CST): D=
on't
            perform the optimization in GENERIC when sanitizing and x has a
            reference type.

            * g++.dg/ubsan/pr101210.C: New test.

    (cherry picked from commit 53fd7544aff6d0a18869017cb9bb921a7f5dcd04)=