From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 40885 invoked by alias); 23 Apr 2015 09:31:52 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 40817 invoked by uid 48); 23 Apr 2015 09:31:47 -0000 From: "rguenth at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/65851] ice in set_lattice_value at tree-ssa-cc p.c:535 Date: Thu, 23 Apr 2015 09:31:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c++ X-Bugzilla-Version: 6.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: rguenth at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED 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: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2015-04/txt/msg01985.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65851 --- Comment #3 from Richard Biener --- We are transitioning from known-bits (likely alignment) to an invariant (thus constant). Most of the cases this happens because of too weak UNDEFINED handling. I suppose we should finally punt in making that "correct" and simply drop that lattice transition... (we already to sth similar for known-bits to known-bits). The assert is really there to catch this kind of missed optimizations, in theory we can just reject invalid transitions...