From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andi Kleen Subject: Re: [RFC] div64_64 support Date: 03 Mar 2007 03:31:52 +0100 Message-ID: References: <20070223170527.4ca695b2@freekitty> <20070226143127.5c74bec9@freekitty> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Jan Engelhardt , linux-kernel@vger.kernel.org, netdev@vger.kernel.org To: Stephen Hemminger Return-path: Received: from ns2.suse.de ([195.135.220.15]:34916 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2992880AbXCCBcP (ORCPT ); Fri, 2 Mar 2007 20:32:15 -0500 In-Reply-To: <20070226143127.5c74bec9@freekitty> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Stephen Hemminger writes: > Here is another way to handle the 64 bit divide case. > It allows full 64 bit divide by adding the support routine > GCC needs. Not supplying that was intentional by Linus so that people think twice (or more often) before they using such expensive operations. A plain / looks too innocent. Is it really needed by CUBIC anyways? It uses it for getting the cubic root, but the algorithm recommended by Hacker's Delight (great book) doesn't use any divisions at all. Probably better to use a better algorithm without divisions. -Andi