220 2 <509DFF12.9060206@gmx.net> article Path: news.gmane.org!not-for-mail From: Jens Maurer Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Allowing constexpr char[]'s in asm directives Date: Sat, 10 Nov 2012 08:15:30 +0100 Lines: 24 Approved: news@gmane.org Message-ID: <509DFF12.9060206@gmx.net> References: <27482d3f-117d-4913-b1ff-feb6267760f3@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 X-Trace: ger.gmane.org 1352531778 11408 80.91.229.3 (10 Nov 2012 07:16:18 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 10 Nov 2012 07:16:18 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDPMTYGK64JRBQX666CAKGQEQQ5GJTQ@isocpp.org Sat Nov 10 08:16:28 2012 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-bk0-f70.google.com ([209.85.214.70]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1TX5Iq-0003x4-N8 for gclcip-std-proposals@m.gmane.org; Sat, 10 Nov 2012 08:16:28 +0100 Original-Received: by mail-bk0-f70.google.com with SMTP id jk13sf3414421bkc.9 for ; Fri, 09 Nov 2012 23:16:19 -0800 (PST) Original-Received: by 10.14.199.6 with SMTP id w6mr14875403een.0.1352531779267; Fri, 09 Nov 2012 23:16:19 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.14.198.201 with SMTP id v49ls3286577een.0.gmail; Fri, 09 Nov 2012 23:16:16 -0800 (PST) Original-Received: by 10.14.215.69 with SMTP id d45mr44112354eep.16.1352531776704; Fri, 09 Nov 2012 23:16:16 -0800 (PST) Original-Received: by 10.14.215.69 with SMTP id d45mr44112347eep.16.1352531776675; Fri, 09 Nov 2012 23:16:16 -0800 (PST) Original-Received: from mailout-de.gmx.net (mailout-de.gmx.net. [213.165.64.23]) by mx.google.com with SMTP id m46si1296573eeo.89.2012.11.09.23.16.16; Fri, 09 Nov 2012 23:16:16 -0800 (PST) Received-SPF: pass (google.com: domain of Jens.Maurer@gmx.net designates 213.165.64.23 as permitted sender) client-ip=213.165.64.23; Original-Received: (qmail invoked by alias); 10 Nov 2012 07:16:13 -0000 Original-Received: from dslb-088-072-129-079.pools.arcor-ip.net (EHLO [192.168.2.100]) [88.72.129.79] by mail.gmx.net (mp017) with SMTP; 10 Nov 2012 08:16:13 +0100 X-Authenticated: #5874409 X-Provags-ID: V01U2FsdGVkX1/zOotTAGrzzsb+w0hc2yqTSxTJp9S/s0LJg06X1C +RN5DCuonQ69I+ User-Agent: Mozilla/5.0 (X11; Linux i686; rv:6.0.1) Gecko/20110830 Thunderbird/6.0.1 In-Reply-To: <27482d3f-117d-4913-b1ff-feb6267760f3@isocpp.org> X-Y-GMX-Trusted: 0 X-Original-Sender: jens.maurer@gmx.net X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of Jens.Maurer@gmx.net designates 213.165.64.23 as permitted sender) smtp.mail=Jens.Maurer@gmx.net Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:2 Archived-At: On 11/10/2012 02:15 AM, stackmachine@hotmail.com wrote: > Simple feature: Allow the use of compiletime constant strings in asm directives. That would allow generating asm through template-meta programs. Wouldn't that be damn awesome? Could you provide an example program that makes use of such a feature in a non-trivial way, including the generation of the compile-time constant strings? In which way would the portability of that program be improved if the standard would prescribe the feature you're proposing? This needs a lot more elaboration before I'm willing to invest committee time in it. The current standard doesn't say a lot about "asm" (see section 7.4), except that its argument must be a string-literal. And even then, the entire asm is conditionally-supported, meaning an implementation can simply refuse an "asm" with an error message (and not implement it). Jens -- .