From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 26218 invoked by alias); 2 Jun 2007 02:00:15 -0000 Received: (qmail 26031 invoked by uid 48); 2 Jun 2007 02:00:02 -0000 Date: Sat, 02 Jun 2007 02:00:00 -0000 Message-ID: <20070602020001.26030.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug tree-optimization/32183] [4.3 Regression] reassoc2 can more extra calculations into a loop In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "hjl at lucon dot org" 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: 2007-06/txt/msg00080.txt.bz2 ------- Comment #13 from hjl at lucon dot org 2007-06-02 02:00 ------- (In reply to comment #11) > (In reply to comment #10) > > I will try to track down which checkin causes this. > No need, it was just the addition of DCE. So what is happening now is that DCE > removes the other use of the multiply so reassiocation can happen and then > reassiocation just happens to make it worse than it was before. > Has anyone measured impact of adding DCE on SPEC CPU 2000/2006 peformance? -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32183