From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from terminus.zytor.com ([198.137.202.10]:40667 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751991AbaBHSwc (ORCPT ); Sat, 8 Feb 2014 13:52:32 -0500 Message-ID: <52F67CD7.5090609@zytor.com> Date: Sat, 08 Feb 2014 10:52:07 -0800 From: "H. Peter Anvin" MIME-Version: 1.0 Subject: Re: [PATCH 02/17] x86, lto: Disable fancy hweight optimizations for LTO v2 References: <1391846481-31491-1-git-send-email-ak@linux.intel.com> <1391846481-31491-2-git-send-email-ak@linux.intel.com> In-Reply-To: <1391846481-31491-2-git-send-email-ak@linux.intel.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kbuild-owner@vger.kernel.org List-ID: To: Andi Kleen , linux-kernel@vger.kernel.org Cc: linux-kbuild@vger.kernel.org, x86@kernel.org On 02/08/2014 12:01 AM, Andi Kleen wrote: > The fancy x86 hweight uses different compiler options for the > hweight file. This does not work with LTO. Just disable the optimization > with LTO No, I'm going to NAK this. This means not using the POPCNT instruction if LTO is enabled, and that really isn't an acceptable option. -hpa