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Subject: [Bug rtl-optimization/94873] [8/9/10/11 Regression] wrong code with
 -O -fno-merge-constants -fno-split-wide-types -fno-tree-fre
Date: Wed, 06 May 2020 07:34:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94873

--- Comment #20 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:f14848aea70066777faf201c0b6eb3c5520bfab9

commit r11-127-gf14848aea70066777faf201c0b6eb3c5520bfab9
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed May 6 09:31:19 2020 +0200

    combine: Don't replace SET_SRC with REG_EQUAL note content if SET_SRC h=
as
side-effects [PR94873]

    There were some discussions about whether REG_EQUAL notes are valid on
insns with a single
    set which contains auto-inc-dec side-effects in the SET_SRC and the
majority thinks that
    it should be valid.  So, this patch fixes the combiner to punt in that
case, because otherwise
    the auto-inc-dec side-effects from the SET_SRC are lost.

    2020-05-06  Jakub Jelinek  <jakub@redhat.com>

            PR rtl-optimization/94873
            * combine.c (combine_instructions): Don't optimize using REG_EQ=
UAL
            note if SET_SRC (set) has side-effects.

            * gcc.dg/pr94873.c: New test.=