From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 985 invoked by alias); 25 Feb 2006 18:31:26 -0000 Received: (qmail 949 invoked by alias); 25 Feb 2006 18:31:21 -0000 Date: Sat, 25 Feb 2006 18:37:00 -0000 Message-ID: <20060225183121.948.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug tree-optimization/26406] [4.2 Regression] Forwardprop does harm for VRP to figure out if a point is non zero In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "law at redhat dot com" Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2006-02/txt/msg02923.txt.bz2 List-Id: ------- Comment #15 from law at redhat dot com 2006-02-25 18:31 ------- Subject: Re: [4.2 Regression] Forwardprop does harm for VRP to figure out if a point is non zero On Sat, 2006-02-25 at 17:31 +0000, pinskia at gcc dot gnu dot org wrote: > > ------- Comment #14 from pinskia at gcc dot gnu dot org 2006-02-25 17:31 ------- > Why is forward prop doing this in the first place, this actually causes > increased register pressure for sure, at least for non one use variables? Because in the case of multiple-use it's removing a partial redundancy. I've already stated I believe I have a way to fix this. Please be patient, there are more pressing matters to deal with first. jeff -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26406