From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 29435 invoked by alias); 13 Jun 2012 09:46:48 -0000 Received: (qmail 29424 invoked by uid 22791); 13 Jun 2012 09:46:46 -0000 X-SWARE-Spam-Status: No, hits=-4.3 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00,KHOP_THREADED,TW_IV X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Wed, 13 Jun 2012 09:46:33 +0000 From: "rguenth at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/53645] Missed optimization for vector integer division lowering Date: Wed, 13 Jun 2012 09:46:00 -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-Keywords: missed-optimization X-Bugzilla-Severity: enhancement X-Bugzilla-Who: rguenth 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: --- X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 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 X-SW-Source: 2012-06/txt/msg00766.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53645 --- Comment #4 from Richard Guenther 2012-06-13 09:46:19 UTC --- (In reply to comment #2) > I think we've talked about enhancing the pattern recognizer to expand it as > mult at the tree level, reusing parts of the expander code for that. I believe > I've looked at it, but can't find any patch (I think it was around mid December > when > sdivmod pattern recognizer has been added). I'll look at it again. Note that this is already vector form in source, so enhancing the pattern recognizer would only help for PR51581. I think we want to move synth_mult / expand_divmod to the tree level or make its worker IL independent (possibly with using appropriate costs for vector vs. scalar during vector lowering).