220 21459 <23054154.pep436rK5Q@tjmaciei-mobl4> article Path: news.gmane.org!not-for-mail From: Thiago Macieira Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: alias_ptr, restrict_ptr, unaligned_ptr Date: Thu, 08 Oct 2015 16:23:03 -0700 Lines: 37 Approved: news@gmane.org Message-ID: <23054154.pep436rK5Q@tjmaciei-mobl4> References: <2270922.AyAy1RJ3rj@tjmaciei-mobl4> <561a7ad2-1b25-47e1-8aaf-b3fe53d52e95@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Trace: ger.gmane.org 1444346602 6291 80.91.229.3 (8 Oct 2015 23:23:22 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 8 Oct 2015 23:23:22 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCB4TK757YBRBYXV3OYAKGQE6WTE2TI@isocpp.org Fri Oct 09 01:23:15 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wi0-f200.google.com ([209.85.212.200]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ZkKWp-0004ay-8J for gclcip-std-proposals@m.gmane.org; Fri, 09 Oct 2015 01:23:15 +0200 Original-Received: by wicgi15 with SMTP id gi15sf11920786wic.2 for ; Thu, 08 Oct 2015 16:23:14 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:subject:date:message-id:user-agent :in-reply-to:references:mime-version:content-type:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=zrQZ1e8mk3QGVMYJVX6rRB+N8kB/LsU95NE/Y6mwTYw=; b=HxuFBMwexzZmnMvVdGoYAi+TnfqIbsGahLMfuDg+I7Kvh8xyiCQTbcuuQ1zKuyndAs OYqdiHM72pLKrrsJWfh4NO7T1dW0wJiklL/StPGPFe5Mt76iLgZFwaClmdhkTp6K5UPf ADa/eOBuxxgXqaYfh86T1ivTBeTYWKdrIVrIa72vDuEz8kwZzXC6sCfSmZ6r161PSV6i cd04zaRvUIJvD2Udfef5G9oBJPHhL0xUDPH8uItbHri/+/lb71yveo/gzc67v+GPvCPt iiYnGbS0iL+7wpjTm482fUDFRLkZIVGW0pNxjz1MDN0nPCb9dI6TFI3GW9R8WrU7CLD+ nrzQ= X-Gm-Message-State: ALoCoQkQRNSD82i/A0jrF7NW7VxXJDwgPVj8vThZY7agwgkyE0Ng68MnMrD5rWr0EqYoDUxXz+Nv X-Received: by 10.180.9.104 with SMTP id y8mr1240172wia.7.1444346594706; Thu, 08 Oct 2015 16:23:14 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.11.4 with SMTP id m4ls237992wib.10.gmail; Thu, 08 Oct 2015 16:23:14 -0700 (PDT) X-Received: by 10.180.221.193 with SMTP id qg1mr6603541wic.87.1444346594016; Thu, 08 Oct 2015 16:23:14 -0700 (PDT) Original-Received: from gondolin.macieira.info (gondolin.macieira.info. [2a01:4f8:d13:f81:21c:14ff:fe01:12a3]) by mx.google.com with ESMTP id mw8si14794970wic.89.2015.10.08.16.23.13 for ; Thu, 08 Oct 2015 16:23:13 -0700 (PDT) Received-SPF: pass (google.com: domain of thiago@macieira.org designates 2a01:4f8:d13:f81:21c:14ff:fe01:12a3 as permitted sender) client-ip=2a01:4f8:d13:f81:21c:14ff:fe01:12a3; Original-Received: from tjmaciei-mobl4.localnet (75-104-69-73.mobility.exede.net [75.104.69.73]) by gondolin.macieira.info (Postfix) with ESMTPSA id CBE8811B824 for ; Thu, 8 Oct 2015 16:23:12 -0700 (PDT) User-Agent: KMail/4.14.9 (Linux/4.1.6-1-desktop; KDE/4.14.9; x86_64; ; ) In-Reply-To: <561a7ad2-1b25-47e1-8aaf-b3fe53d52e95@isocpp.org> X-Original-Sender: thiago@macieira.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of thiago@macieira.org designates 2a01:4f8:d13:f81:21c:14ff:fe01:12a3 as permitted sender) smtp.mailfrom=thiago@macieira.org Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Spam-Checked-In-Group: std-proposals@isocpp.org 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:21459 Archived-At: On Thursday 08 October 2015 08:29:21 Nicol Bolas wrote: > On Thursday, October 8, 2015 at 11:24:39 AM UTC-4, Thiago Macieira wrote: > > On Thursday 08 October 2015 05:53:31 Nicol Bolas wrote: > > > However, IEEE-754 would still be a bit... dubious. There are many ARM > > > platforms that have to emulate floats in software. At the very least, > > > > there > > > > > should be a way to test whether floats are real IEEE-754 or emulated. > > > > I don't think that's a problem. Most emulations do use IEEE 754 too, so > > they'd > > fulfil the requirement. > > Yes, but how *exact* are they? Do they provide the exact (within the > tolerances of the spec) precision required for IEEE-754, 32-bit precision? > I imagine most of them cut corners and are willing to burn a digit or 3's > precision to get a faster answer. Maybe, but for the purposes of where the discussion started here, this is mostly about accessing the bits of the float so you can manipulate them more easily. -- Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org Software Architect - Intel Open Source Technology Center PGP/GPG: 0x6EF45358; fingerprint: E067 918B B660 DBD1 105C 966C 33F5 F005 6EF4 5358 -- --- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. To unsubscribe from this group and stop receiving emails from it, send an email to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposals/. .