From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 6320 invoked by alias); 30 Sep 2009 13:18:00 -0000 Received: (qmail 5635 invoked by uid 48); 30 Sep 2009 13:17:47 -0000 Date: Wed, 30 Sep 2009 13:18:00 -0000 Message-ID: <20090930131747.5634.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug tree-optimization/41488] IVOpts cannot coalesce multiple induction variables In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "rguenth at gcc dot gnu 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: 2009-09/txt/msg02737.txt.bz2 ------- Comment #3 from rguenth at gcc dot gnu dot org 2009-09-30 13:17 ------- The issue here is that loop header copying creates a new induction variable by moving the use before the definition of D.2708_4 = start_3(D) + i_12. So it just does what we teach PRE not to do ... -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41488