Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 18 Jan 2002 11:47:01 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 18 Jan 2002 11:46:53 -0500 Received: from smtp1.vol.cz ([195.250.128.73]:7691 "EHLO smtp1.vol.cz") by vger.kernel.org with ESMTP id ; Fri, 18 Jan 2002 11:46:39 -0500 Date: Sat, 12 Jan 2002 06:31:36 +0000 From: Pavel Machek To: Andi Kleen Cc: Alan Cox , linux-kernel@vger.kernel.org Subject: Re: [Q] Looking for an emulation for CMOV* instructions. Message-ID: <20020112063136.E511@toy.ucw.cz> In-Reply-To:

Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0.1i In-Reply-To: ; from ak@suse.de on Fri, Jan 11, 2002 at 10:54:07AM +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi! > > The kernel isnt there to fix up the fact authors can't read. Its also very > > hard to get emulations right. I grant that this wasn't helped by the fact > > the gcc x86 folks also couldnt read the pentium pro manual correctly. > > One corner case where emulation would IMHO make sense would be CMPXCHG8. > It would allow to do efficient inline mutexes in pthreads, and hit the > emulation only on 386/486. cpu feature flag checking is unfortunately > not an option normally for inline code. > > -Andi (who would have already done it if he had an 486/386 to test) Do you want one? I have elonex, which is 486sx, small and quiet (needs NFS root). But I'd want it back eventually. Or I might be able to get you some 386... Pavel -- Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt, details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/