From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 31330 invoked by alias); 29 Jul 2003 18:12:10 -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 31221 invoked from network); 29 Jul 2003 18:12:06 -0000 Received: from unknown (HELO kayak.mcgary.org) (63.227.80.137) by sources.redhat.com with SMTP; 29 Jul 2003 18:12:06 -0000 Received: from kayak.mcgary.org (localhost [127.0.0.1]) by kayak.mcgary.org (8.12.8/8.12.8) with ESMTP id h6TIC5FA013838; Tue, 29 Jul 2003 11:12:05 -0700 Received: (from gkm@localhost) by kayak.mcgary.org (8.12.8/8.12.8/Submit) id h6TIC1UV013828; Tue, 29 Jul 2003 11:12:01 -0700 X-Authentication-Warning: kayak.mcgary.org: gkm set sender to greg@mcgary.org using -f To: "Nitin Gupta--SSW, Noida" Cc: gcc@gcc.gnu.org, greg@mcgary.org Subject: Re: ideas for modeling pipeline with bypass registers? References: From: Greg McGary Date: Tue, 29 Jul 2003 18:26:00 -0000 In-Reply-To: Message-ID: User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-SW-Source: 2003-07/txt/msg02049.txt.bz2 "Nitin Gupta--SSW, Noida" writes: > > No. It doesn't make sense to allocate it because it has a fixed, > > limited, machine-defined use and isn't available for other purposes. > How many such registers do you have in your target? I don't see how it matters at the level of abstraction we are dealing with, but there are three functional-units: adder, barrel-shifter, logic, and each has a bypass register. Greg