From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Sun, 08 Sep 2002 18:12:50 +0200 (CEST) Received: from p508B4F9D.dip.t-dialin.net ([80.139.79.157]:29568 "EHLO dea.linux-mips.net") by linux-mips.org with ESMTP id ; Sun, 8 Sep 2002 18:12:49 +0200 Received: (from ralf@localhost) by dea.linux-mips.net (8.11.6/8.11.6) id g869UnT04205; Fri, 6 Sep 2002 11:30:49 +0200 Date: Fri, 6 Sep 2002 11:30:49 +0200 From: Ralf Baechle To: "Maciej W. Rozycki" Cc: Daniel Jacobowitz , Hartvig Ekner , "Kevin D. Kissell" , Tor Arntsen , Carsten Langgaard , linux-mips@linux-mips.org Subject: Re: 64-bit and N32 kernel interfaces Message-ID: <20020906113049.A2993@linux-mips.org> References: <20020905145954.GA17383@nevyn.them.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: ; from macro@ds2.pg.gda.pl on Thu, Sep 05, 2002 at 05:10:51PM +0200 Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 144 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: ralf@linux-mips.org Precedence: bulk X-list: linux-mips On Thu, Sep 05, 2002 at 05:10:51PM +0200, Maciej W. Rozycki wrote: > > No - the point is that all data types have the same size in N32. It > > was created explicitly as a transitional sop for people who didn't want > > to fix their code, but wanted a performance increase from their 64-bit > > hardware. > > Well, what's the performance increase of n32 over o32? The increased > number of argument registers? I doubt it's noticeable in most cases. That's a minor optimization. More important is the availability of MIPS III/IV and MIPS64 instruction sets which means 64-bit integer registers and 32 64-bit double precission fp registers. Ralf