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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/111497] [11/12/13 Regression] ICE building mariadb
 on i686 since r8-470
Date: Thu, 30 Nov 2023 11:44:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111497

--- Comment #9 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-13 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:741743c028dc00f27b9c8b1d5211c1f602f2fddd

commit r13-8109-g741743c028dc00f27b9c8b1d5211c1f602f2fddd
Author: Vladimir N. Makarov <vmakarov@redhat.com>
Date:   Mon Sep 25 16:19:50 2023 -0400

    [PR111497][LRA]: Copy substituted equivalence

    When we substitute the equivalence and it becomes shared, we can fail
    to correctly update reg info used by LRA.  This can result in wrong
    code generation, e.g. because of incorrect live analysis.  It can also
    result in compiler crash as the pseudo survives RA.  This is what
    exactly happened for the PR.  This patch solves this problem by
    unsharing substituted equivalences.

    gcc/ChangeLog:

            PR middle-end/111497
            * lra-constraints.cc (lra_constraints): Copy substituted
            equivalence.
            * lra.cc (lra): Change comment for calling unshare_all_rtl_agai=
n.

    gcc/testsuite/ChangeLog:

            PR middle-end/111497
            * g++.target/i386/pr111497.C: new test.

    (cherry picked from commit 3c23defed384cf17518ad6c817d94463a445d21b)=