Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753744AbZJCWcu (ORCPT ); Sat, 3 Oct 2009 18:32:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753257AbZJCWct (ORCPT ); Sat, 3 Oct 2009 18:32:49 -0400 Received: from boogie.lpds.sztaki.hu ([193.224.70.237]:37109 "EHLO boogie.lpds.sztaki.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752267AbZJCWcs (ORCPT ); Sat, 3 Oct 2009 18:32:48 -0400 Date: Sun, 4 Oct 2009 00:32:10 +0200 From: Gabor Gombas To: Matteo Croce Cc: Arjan van de Ven , "H. Peter Anvin" , linux-kernel@vger.kernel.org Subject: Re: i686 quirk for AMD Geode Message-ID: <20091003223210.GA4193@boogie.lpds.sztaki.hu> References: <40101cc30910021912r17b3a08bue1b9412e4fa47d89@mail.gmail.com> <20091003110546.78958508@infradead.org> <40101cc30910031504pa9f8536k82dbd7668dfa643d@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <40101cc30910031504pa9f8536k82dbd7668dfa643d@mail.gmail.com> X-Copyright: Forwarding or publishing without permission is prohibited. Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1062 Lines: 25 On Sun, Oct 04, 2009 at 12:04:03AM +0200, Matteo Croce wrote: > yes cmov and i686 are unrelated but some distros (Debian & co.) > compiles libraries for two archs: > i486 and i686-cmov so only i686 machines does benefit from cmov. > This is why I cared about having an i686 aware userspace but it seems > that for a missing instruction I can't do that You could emulate the missing instruction. As long as it is not really used, the performance cost of the emulation should not matter. Of course if userspace starts to use long NOPs extensively then it becomes a problem. Gabor -- --------------------------------------------------------- MTA SZTAKI Computer and Automation Research Institute Hungarian Academy of Sciences --------------------------------------------------------- -- 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/