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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/96722] [8/9/10/11 Regression] Clobbers on
 NULL since r8-1519
Date: Tue, 25 Aug 2020 11:50:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96722

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:a5b15fcb954ba63d58f0daa700281aba33b5f24a

commit r11-2840-ga5b15fcb954ba63d58f0daa700281aba33b5f24a
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Aug 25 13:49:40 2020 +0200

    gimple: Ignore *0 =3D {CLOBBER} in path isolation [PR96722]

    Clobbers of MEM_REF with NULL address are just fancy nops, something we
just
    ignore and don't emit any code for it (ditto for other clobbers), they =
just
    mark end of life on something, so we shouldn't infer from those that th=
ere
    is some UB.

    2020-08-25  Jakub Jelinek  <jakub@redhat.com>

            PR tree-optimization/96722
            * gimple.c (infer_nonnull_range): Formatting fix.
            (infer_nonnull_range_by_dereference): Return false for clobber
stmts.

            * g++.dg/opt/pr96722.C: New test.=