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Subject: [Bug rtl-optimization/100148] [10/11/12 Regression] -fcompare-debug
 failure (length) with -O2 -fno-dce -fno-tree-dce -fno-tree-dominator-opts
 -fno-tree-sink
Date: Wed, 21 Apr 2021 10:32:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100148

--- Comment #4 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:022f6ee3ad67ee30f62c8c2aeeb4156494f3284e

commit r12-24-g022f6ee3ad67ee30f62c8c2aeeb4156494f3284e
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Apr 21 12:31:45 2021 +0200

    cprop: Fix -fcompare-debug bug in constprop_register [PR100148]

    The following testcase shows different behavior between -g and -g0
    in constprop_register, if a flags register setter is separated
    from a conditional jump using those flags with -g by a DEBUG_INSN.
    As it uses just NEXT_INSN, for -g it will look at the DEBUG_INSN which =
is
    not a conditional jump, while otherwise it would look at the conditional
    jump and call cprop_jump.

    2021-04-21  Jakub Jelinek  <jakub@redhat.com>

            PR rtl-optimization/100148
            * cprop.c (constprop_register): Use next_nondebug_insn instead =
of
            NEXT_INSN.

            * g++.dg/opt/pr100148.C: New test.=