From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id C0AEA3858C55; Tue, 12 Apr 2022 03:11:53 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org C0AEA3858C55 From: "crazylht at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/105216] [12 regression] 8% regression for m-queens compared to gcc11 O2 on CLX. Date: Tue, 12 Apr 2022 03:11:53 +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, needs-bisection X-Bugzilla-Severity: normal X-Bugzilla-Who: crazylht at gmail dot com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 12.0 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: Tue, 12 Apr 2022 03:11:53 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105216 --- Comment #10 from Hongtao.liu --- Probably related to below 3 cancelled jump thread which affects pre. 2076Threading through latch before loop opts would create non-empty latch: 2077 Cancelling jump thread: (15, 16) incoming edge; (16, 43) normal; 3742Path crosses loops: 3743 Cancelling jump thread: (36, 3) incoming edge; (3, 37) normal (37, 4) nocopy; 4755Threading through latch before loop opts would create non-empty latch: 4756 Cancelling jump thread: (26, 28) incoming edge; (28, 40) normal;=