From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 1867 invoked by alias); 6 Aug 2012 15:36:54 -0000 Received: (qmail 1855 invoked by uid 22791); 6 Aug 2012 15:36:53 -0000 X-SWARE-Spam-Status: No, hits=-4.3 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00,KHOP_THREADED,TW_FC 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; Mon, 06 Aug 2012 15:36:41 +0000 From: "steven at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/54146] Very slow compile with attribute((flatten)) Date: Mon, 06 Aug 2012 15:36:00 -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: compile-time-hog X-Bugzilla-Severity: normal X-Bugzilla-Who: steven 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: 2012-08/txt/msg00345.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54146 --- Comment #21 from Steven Bosscher 2012-08-06 15:36:04 UTC --- (In reply to comment #20) Yay, it's always nice to be right the first time when diagnosing a problem. The tree loop optimizers spend 285s out of 1360s total compile time (with my flatten hack and ifcvt patch applied) in compute_global_livein. That's 21% of the total compile time. I have a few ideas for how to fix this.