From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 120887 invoked by alias); 11 Mar 2015 17:46:17 -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 120789 invoked by uid 48); 11 Mar 2015 17:46:14 -0000 From: "jiwang at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/62173] [5 Regression] 64bit Arch can't ivopt while 32bit Arch can Date: Wed, 11 Mar 2015 17:46:00 -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: jiwang 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: 2015-03/txt/msg01241.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62173 --- Comment #36 from Jiong Wang --- and for rtl level improvement, need to enable DF_DU_CHAIN build on top of existing DF_UD_CHAIN (may cause extra compile time resource consumption). one draft patch is here, no feedback yet. https://gcc.gnu.org/ml/gcc-patches/2015-02/msg00736.html as both tree and rtl fix contain generic code modifications, I think it's better to defer it to next stage-1 given the issue itself is enhancement not bug.