From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 31155 invoked by alias); 27 May 2012 00:51:45 -0000 Received: (qmail 31140 invoked by uid 22791); 27 May 2012 00:51:43 -0000 X-SWARE-Spam-Status: No, hits=-2.5 required=5.0 tests=AWL,BAYES_00,DKIM_SIGNED,DKIM_VALID,FREEMAIL_FROM,KHOP_THREADED,RCVD_IN_DNSWL_NONE,RCVD_IN_HOSTKARMA_YE,T_RP_MATCHES_RCVD X-Spam-Check-By: sourceware.org Received: from imr-db03.mx.aol.com (HELO imr-db03.mx.aol.com) (205.188.91.97) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Sun, 27 May 2012 00:51:28 +0000 Received: from mtaout-mb02.r1000.mx.aol.com (mtaout-mb02.r1000.mx.aol.com [172.29.41.66]) by imr-db03.mx.aol.com (8.14.1/8.14.1) with ESMTP id q4R0pNF0019676 for ; Sat, 26 May 2012 20:51:23 -0400 Received: from [192.168.0.3] (cpe-69-133-204-177.cinci.res.rr.com [69.133.204.177]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mtaout-mb02.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPSA id 58107E00008E for ; Sat, 26 May 2012 20:51:23 -0400 (EDT) Message-ID: <4FC17A8A.5050205@aol.com> Date: Sun, 27 May 2012 07:30:00 -0000 From: Tim Prince Reply-To: tprince@computer.org User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 MIME-Version: 1.0 To: cygwin@cygwin.com Subject: Re: Is the Latest Release of Cygwin supported on Windows Server 8/2012 References: <70952A932255A2489522275A628B97C31348C437@xmb-sjc-233.amer.cisco.com> <4FC169D9.6090107@tlinx.org> In-Reply-To: <4FC169D9.6090107@tlinx.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:428693152:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d29424fc17a8b537a X-AOL-IP: 69.133.204.177 Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com X-SW-Source: 2012-05/txt/msg00591.txt.bz2 On 05/26/2012 07:40 PM, Linda Walsh wrote: > > > Every time you fetch a word or instruction that is not 8-byte > aligned, > you force a fatal (but caught by the processor and/or OS) signal for > unaligned > data. That forces execution out of the pipeline (though not likely > out of > cache, sadly, due to frequency of occurrence). That's not counting > the extra > cycles to fetch the rest of the data. On some machines that can > easily amount > to several dozen instructions worth. > There have been compilers for 32-bit Windows for 20 years which gave 8-byte alignments by default. cygwin changed the default configure parameter in binutils so as to support alignment about 8 years ago. It was tolerable to some before then as it matters only for 64-bit and larger objects (doubles, and SSE, after that was introduced). The characteristics of the worst compiler (with respect to alignment) available outside of cygwin don't have a bearing on this list. If the powers that be have decided that 64-bit mode should be supported on cygwin setup.exe only by mingw cross compilers, I'll accept that. -- Tim Prince -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple