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 7DE163894C35; Wed,  7 Apr 2021 02:29:41 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 7DE163894C35
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/98736] [10/11 Regression] Wrong partition
 order generated in loop distribution pass since r10-619-g5879ab5fafedc8f6
Date: Wed, 07 Apr 2021 02:29:41 +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: 11.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: cvs-commit at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: amker at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 10.3
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-98736-4-gGHwcUA9i2@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-98736-4@http.gcc.gnu.org/bugzilla/>
References: <bug-98736-4@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, 07 Apr 2021 02:29:41 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98736

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Bin Cheng <amker@gcc.gnu.org>:

https://gcc.gnu.org/g:e0bdccac582c01c928a05f26edcd8f5ac24669eb

commit r11-8023-ge0bdccac582c01c928a05f26edcd8f5ac24669eb
Author: Bin Cheng <bin.cheng@linux.alibaba.com>
Date:   Wed Apr 7 10:24:32 2021 +0800

    tree-optimization/98736 - use programing order preserved RPO in ldist

    Tree loop distribution uses RPO to build reduced dependence graph,
    it's important that RPO preserves the original programing order.
    Though it usually does so, when distributing loop nest, exit BB can
    be placed before some loop BBs while after loop header.  This patch
    fixes the issue by calling rev_post_order_and_mark_dfs_back_seme.

    gcc/ChangeLog:

            PR tree-optimization/98736
            * tree-loop-distribution.c
            * (loop_distribution::bb_top_order_init):
            Compute RPO with programing order preserved by calling function
            rev_post_order_and_mark_dfs_back_seme.

    gcc/testsuite/ChangeLog:

            PR tree-optimization/98736
            * gcc.c-torture/execute/pr98736.c: New test.=