From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 8C9153857818; Thu, 17 Feb 2022 10:48:30 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 8C9153857818 From: "cvs-commit at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/103237] [9/10 Regression] wrong code with -ftree-vectorize at -O1 on x86_64-linux-gnu starting with r7-1219-gb28ead45fe630b9e Date: Thu, 17 Feb 2022 10:48:30 +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: 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: rguenth at gcc dot gnu.org X-Bugzilla-Target-Milestone: 9.5 X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: 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 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Feb 2022 10:48:30 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103237 --- Comment #10 from CVS Commits --- The releases/gcc-10 branch has been updated by Richard Biener : https://gcc.gnu.org/g:c4015dab1a4697177f5801c8149f7ce15eeeb9e1 commit r10-10465-gc4015dab1a4697177f5801c8149f7ce15eeeb9e1 Author: Richard Biener Date: Mon Nov 15 11:37:56 2021 +0100 tree-optimization/103237 - avoid vectorizing unhandled double reductions Double reductions which have multiple LC PHIs in the inner loop are not handled correctly during transformation since those PHIs are not properly classified as reduction. The following disables vectorizing them. 2021-11-15 Richard Biener PR tree-optimization/103237 * tree-vect-loop.c (vect_is_simple_reduction): Fail for double reductions with multiple inner loop LC PHI nodes. * gcc.dg/torture/pr103237.c: New testcase. (cherry picked from commit 220bd61874cf114667b44f9ded76ed0639eb278b)=