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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94283

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Jakub Jelinek
<jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:4dcfd4e56b0d22af12750372f3e0b49249b1d473

commit r9-8469-g4dcfd4e56b0d22af12750372f3e0b49249b1d473
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Apr 7 20:57:37 2020 +0200

    if-conv: Fix -fcompare-debug bugs in ifcvt_local_dce [PR94283]

    The following testcase shows -fcompare-debug bugs in ifcvt_local_dce,
    where the decisions what statements are needed is based also on debug s=
tmt
    operands, which is wrong.
    So, this patch makes sure to never add debug stmt to the worklist, or n=
ever
    add an assign to worklist just because it is used in a debug stmt in
another
    bb.

    2020-03-24  Jakub Jelinek  <jakub@redhat.com>

            PR debug/94283
            * tree-if-conv.c (ifcvt_local_dce): For gimple debug stmts, just
set
            GF_PLF_2, but don't add them to worklist.  Don't add an assigme=
nt
to
            worklist or set GF_PLF_2 just because it is used in a debug stm=
t in
            another bb.  Formatting improvements.

            * gcc.target/i386/pr94283.c: New test.=