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Subject: [Bug rtl-optimization/100254] [11/12 Regression] -fcompare-debug
 failure (length) with -O2 -fno-guess-branch-probability -fipa-pta
 -fnon-call-exceptions
Date: Tue, 04 May 2021 12:21:55 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100254

--- Comment #8 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:1eb90acf00a47f9ed28ff6bd7914a4ae4bf9d325

commit r9-9505-g1eb90acf00a47f9ed28ff6bd7914a4ae4bf9d325
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Apr 27 15:26:24 2021 +0200

    cfgcleanup: Fix -fcompare-debug issue in outgoing_edges_match [PR100254]

    The following testcase fails with -fcompare-debug.  The problem is that
    outgoing_edges_match behaves differently between -g0 and -g, if
    some load/store with REG_EH_REGION is followed by DEBUG_INSNs, the
    REG_EH_REGION check is not done, while when there are no DEBUG_INSNs, i=
t is
    done.

    We already compute last1 and last2 as BB_END (bb{1,2}) with skipped deb=
ug
    insns and notes, so this patch just uses those.

    2021-04-27  Jakub Jelinek  <jakub@redhat.com>

            PR rtl-optimization/100254
            * cfgcleanup.c (outgoing_edges_match): Check REG_EH_REGION on
            last1 and last2 insns rather than BB_END (bb1) and BB_END (bb2)
insns.

            * g++.dg/opt/pr100254.C: New test.

    (cherry picked from commit e600df51a15b2ec7a72731921a2464ffe59cf5ab)=