From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 16DE43861031; Thu, 25 Feb 2021 18:34:12 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 16DE43861031 From: "matz at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/99101] optimization bug with -ffinite-loops Date: Thu, 25 Feb 2021 18:34:11 +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: matz 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: 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, 25 Feb 2021 18:34:12 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99101 --- Comment #19 from Michael Matz --- (In reply to Michael Matz from comment #18) > But there are other blocks control dependend on bb4, namely bb5 and bb9. > To see this observe that bb9 doesn't pdom bb4, but there's a path from bb= 4 to > bb9 (e.g. bb4 -> bb5 -> bb9), where one node in that path that isn't bb4 = is ... where _each_ node in that path that isn't bb4 ... Sorry. (Essentially this captures the idea that the path-start node that is the control node is the _latest_ node that determines (non)execution of the path-end, i= .e. all further nodes after the control node unavoidably pass through path-end).=