From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id E44343858430; Wed, 24 Nov 2021 11:40:50 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org E44343858430
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/103168] Value numbering for PRE of pure
 functions can be improved
Date: Wed, 24 Nov 2021 11:40:50 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 12.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: normal
X-Bugzilla-Who: cvs-commit at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: rguenth at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-103168-4-UtAXuLXURD@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-103168-4@http.gcc.gnu.org/bugzilla/>
References: <bug-103168-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Wed, 24 Nov 2021 11:40:51 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103168

--- Comment #18 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:6180f5c8d6d1dc7b6634c41a46f0f8f5ca2e5b9d

commit r12-5499-g6180f5c8d6d1dc7b6634c41a46f0f8f5ca2e5b9d
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Nov 24 09:08:44 2021 +0100

    tree-optimization/103168 - Improve VN of pure function calls

    This improves value-numbering of calls that read memory, calls
    to const functions with aggregate arguments and calls to
    pure functions where the latter include const functions we
    demoted to pure for the fear of interposing with a less
    optimized version.  Note that for pure functions we do not
    handle functions that access global memory.

    2021-11-24  Richard Biener  <rguenther@suse.de>
                Jan Hubicka  <jh@suse.cz>

            PR tree-optimization/103168
            * ipa-modref.h (struct modref_summary): Add load_accesses.
            * ipa-modref.c (modref_summary::finalize): Initialize
load_accesses.
            * tree-ssa-sccvn.c (visit_reference_op_call): Use modref
            info to walk the virtual use->def chain to CSE const/pure
            function calls possibly reading from memory.

            * g++.dg/tree-ssa/pr103168.C: New testcase.=