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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/106922] [12 Regression] Bogus uninitialized
 warning on boost::optional<<std::vector<std::string>>>, missed FRE
Date: Mon, 17 Oct 2022 13:10:40 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106922

--- Comment #30 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:b9f58edfc2ccb0fb3840751a2fb4268ce5dd9b3d

commit r12-8837-gb9f58edfc2ccb0fb3840751a2fb4268ce5dd9b3d
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Sep 23 14:28:52 2022 +0200

    tree-optimization/106922 - extend same-val clobber FRE

    The following extends the skipping of same valued stores to
    handle an arbitrary number of them as long as they are from the
    same value (which we now record).  That's an obvious extension
    which allows to optimize the m_engaged member of std::optional
    more reliably.

            PR tree-optimization/106922
            * tree-ssa-sccvn.cc (vn_reference_lookup_3): Allow
            an arbitrary number of same valued skipped stores.

            * g++.dg/torture/pr106922.C: New testcase.

    (cherry picked from commit af611afe5fcc908a6678b5b205fb5af7d64fbcb2)=