Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751564Ab0BWRjE (ORCPT ); Tue, 23 Feb 2010 12:39:04 -0500 Received: from terminus.zytor.com ([198.137.202.10]:39508 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752894Ab0BWRjB (ORCPT ); Tue, 23 Feb 2010 12:39:01 -0500 Message-ID: <4B84118C.90203@zytor.com> Date: Tue, 23 Feb 2010 09:34:04 -0800 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.7) Gecko/20100120 Fedora/3.0.1-1.fc12 Thunderbird/3.0.1 MIME-Version: 1.0 To: Borislav Petkov CC: Michal Marek , linux-kbuild , Peter Zijlstra , Andrew Morton , Wu Fengguang , LKML , Jamie Lokier , Roland Dreier , Al Viro , "linux-fsdevel@vger.kernel.org" , Ingo Molnar , Brian Gerst Subject: Re: [PATCH] x86: Add optimized popcnt variants References: <4B7C29C1.10906@suse.cz> <20100218061923.GA1594@liondog.tnic> <20100219142205.GA32533@aftab> <4B7EB6EF.9010405@zytor.com> <20100219164512.GA492@aftab> <4B7EC20C.30607@zytor.com> <20100222141737.GB21233@aftab> <4B82BD01.3030008@zytor.com> <20100222184945.GD21233@aftab> <4B82E144.1050007@zytor.com> <20100223155852.GF30382@aftab> In-Reply-To: <20100223155852.GF30382@aftab> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 740 Lines: 18 On 02/23/2010 07:58 AM, Borislav Petkov wrote: > > Hmm, we cannot do that with the current design since __arch_hweight64 > is being inlined into every callsite and AFAICT we would have to build > every callsite with "-fcall-saved-rdi" which is clearly too much. The > explicit "=D" dummy constraint is straightforward, instead. > Uh... the -fcall-saved-rdi would go with all the other ones. Assuming it can actually work and that gcc doesn't choke on an inbound argument being saved. -hpa -- 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/