From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 13345 invoked by alias); 26 Jan 2015 11:10:57 -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 13250 invoked by uid 48); 26 Jan 2015 11:10:48 -0000 From: "rguenth at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/62173] [5.0 regression] 64bit Arch can't ivopt while 32bit Arch can Date: Mon, 26 Jan 2015 11:10:00 -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: 5.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: rguenth at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: jiwang at gcc dot gnu.org X-Bugzilla-Target-Milestone: 5.0 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: 2015-01/txt/msg02828.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62173 --- Comment #18 from Richard Biener --- It's probably not correct to simply transfer range info from *idx to iv->base. Instead SCEV analysis needs to track the range of CHREC_LEFT when it analyzes the SSA use-def chain. That's of course a much bigger change :/ The patch may still help in some cases - I suppose the original testcase is reduced from sth else?