From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 18662 invoked by alias); 7 Nov 2013 17:22:18 -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 18628 invoked by uid 48); 7 Nov 2013 17:22:15 -0000 From: "ebotcazou at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/59019] [4.9 regression] ICE in advance_target_bb, at sched-rgn.c:3561 Date: Thu, 07 Nov 2013 17:22:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: rtl-optimization X-Bugzilla-Version: 4.9.0 X-Bugzilla-Keywords: ice-on-valid-code X-Bugzilla-Severity: normal X-Bugzilla-Who: ebotcazou at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 4.9.0 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: 2013-11/txt/msg00650.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59019 --- Comment #4 from Eric Botcazou --- > The problem I see where is we're going to have to run some kind of cleanup > pass after each RTL pass that might make these transformations (cse, gcse, > cprop, combine and I'm sure others). That seems quite heavyweight and bad > from a compile-time standpoint. > > But I don't really see a way out. I guess I'm hoping you have other > suggestions for how we can fix this. Maybe declare trap_if instructions unconditionally control-flow altering? They are probably quite rare in practice, so perhaps this wouldn't really pessimize.