From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 22948 invoked by alias); 30 Sep 2004 17:03:55 -0000 Mailing-List: contact gcc-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Archive: List-Post: List-Help: Sender: gcc-owner@gcc.gnu.org Received: (qmail 22918 invoked from network); 30 Sep 2004 17:03:53 -0000 Received: from unknown (HELO mx2.redhat.com) (66.187.237.31) by sourceware.org with SMTP; 30 Sep 2004 17:03:53 -0000 Received: from int-mx2.corp.redhat.com (int-mx2.corp.redhat.com [172.16.27.26]) by mx2.redhat.com (8.12.11/8.12.10) with ESMTP id i8UH2SCe010153; Thu, 30 Sep 2004 13:02:28 -0400 Received: from potter.sfbay.redhat.com (potter.sfbay.redhat.com [172.16.27.15]) by int-mx2.corp.redhat.com (8.11.6/8.11.6) with ESMTP id i8UH3f701659; Thu, 30 Sep 2004 13:03:51 -0400 Received: from frothingslosh.sfbay.redhat.com (frothingslosh.sfbay.redhat.com [172.16.24.27]) by potter.sfbay.redhat.com (8.11.6/8.11.6) with ESMTP id i8UH3eV14596; Thu, 30 Sep 2004 10:03:40 -0700 Received: from frothingslosh.sfbay.redhat.com (localhost.localdomain [127.0.0.1]) by frothingslosh.sfbay.redhat.com (8.12.10/8.12.10) with ESMTP id i8UH3eQH008421; Thu, 30 Sep 2004 10:03:40 -0700 Received: (from rth@localhost) by frothingslosh.sfbay.redhat.com (8.12.10/8.12.10/Submit) id i8UH3ZbQ008419; Thu, 30 Sep 2004 10:03:35 -0700 X-Authentication-Warning: frothingslosh.sfbay.redhat.com: rth set sender to rth@redhat.com using -f Date: Thu, 30 Sep 2004 19:34:00 -0000 From: Richard Henderson To: Mostafa Hagog Cc: Canqun Yang , gcc@gcc.gnu.org, Ayal Zaks Subject: Re: SMS scheduling Message-ID: <20040930170335.GC8382@redhat.com> Mail-Followup-To: Richard Henderson , Mostafa Hagog , Canqun Yang , gcc@gcc.gnu.org, Ayal Zaks References: <20040930084214.GA6698@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.1i X-SW-Source: 2004-09/txt/msg01672.txt.bz2 On Thu, Sep 30, 2004 at 10:51:31AM +0200, Mostafa Hagog wrote: > > On Thu, Sep 30, 2004 at 10:03:37AM +0200, Mostafa Hagog wrote: > > > For 4.0 SMS intra-loop memory dependencies are detected using > > > the alias.c (as in haifa-sched) for inter-loop memory dependencies > > > we are very conservative and assume that all memory accesses are > > > aliased. > > > > alias.c is flow insensative, and thus as conservative as you > > could want. Why aren't you using it all the time? > > The answer is within your question; flow insensitive. > In SMS we are interested in loop-carried dependancies > and this is not provided by alias.c. Certainly, but surely flow insensitive data is better than assuming all memory accesses are aliased. r~