From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 25302 invoked by alias); 26 Jun 2012 19:53:59 -0000 Received: (qmail 25281 invoked by uid 22791); 26 Jun 2012 19:53:57 -0000 X-SWARE-Spam-Status: No, hits=-3.2 required=5.0 tests=AWL,BAYES_00,KHOP_THREADED,T_RP_MATCHES_RCVD X-Spam-Check-By: sourceware.org Received: from terminus.zytor.com (HELO mail.zytor.com) (198.137.202.10) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Tue, 26 Jun 2012 19:53:31 +0000 Received: from anacreon.sc.intel.com (fmdmzpr03-ext.fm.intel.com [192.55.54.38]) (authenticated bits=0) by mail.zytor.com (8.14.5/8.14.5) with ESMTP id q5QJr7UL026028 (version=TLSv1/SSLv3 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO); Tue, 26 Jun 2012 12:53:07 -0700 Message-ID: <4FEA131D.4090905@zytor.com> Date: Tue, 26 Jun 2012 19:53:00 -0000 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1 MIME-Version: 1.0 To: x32-abi@googlegroups.com CC: "H.J. Lu" , discuss@x86-64.org, GCC Development , Binutils , GNU C Library , GDB Subject: Re: [x86-64 psABI] RFC: Extend x86-64 psABI to support x32 References: In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Mailing-List: contact gdb-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-owner@sourceware.org X-SW-Source: 2012-06/txt/msg00087.txt.bz2 On 06/26/2012 12:47 PM, H.J. Lu wrote: >> >> May I ask why the decision was made to use ILP32 instead of L64P32? The >> latter would seem to avoid lots of porting problems in particular. And if >> porting difficulties are the major complained about x32, is it really too >> late to switch? Thanks - mdb > > x32 is designed to replace ia32 where long is 32-bit, not x86-64. > It's worth noting that there are *no* Linux platforms that are not ILP32 or LP64, so adding a third memory model is likely to cause even more problems... -hpa