220 15623 article Path: news.gmane.org!not-for-mail From: Vlad from Moscow Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Library support for relaxed constexpr Date: Tue, 13 Jan 2015 01:20:34 -0800 (PST) Lines: 108 Approved: news@gmane.org Message-ID: References: <5ccd3d6e-859c-4b66-b61c-317b704647f2@isocpp.org> <14072581.09eDfPqFOs@tjmaciei-mobl4> <9F9D7F25-F862-4358-B074-8F8C87255E2A@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_2754_1091509529.1421140834165" X-Trace: ger.gmane.org 1421140848 6789 80.91.229.3 (13 Jan 2015 09:20:48 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 13 Jan 2015 09:20:48 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCXLLRHD7IDRBYWG2OSQKGQESTCD4KQ@isocpp.org Tue Jan 13 10:20:37 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qc0-f198.google.com ([209.85.216.198]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1YAxeO-0000ag-1Y for gclcip-std-proposals@m.gmane.org; Tue, 13 Jan 2015 10:20:36 +0100 Original-Received: by mail-qc0-f198.google.com with SMTP id i8sf4927305qcq.1 for ; Tue, 13 Jan 2015 01:20:35 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:to:message-id:in-reply-to:references :subject:mime-version:content-type:x-original-sender:reply-to :precedence:mailing-list:list-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=ltoz4smizwdbwgSDdJq/e+mUdhFPeN5l8GjeIBX+FmI=; b=NAvWJ4uQ3Pq1IwTjuGGpL72kj+JmUQl5fUb1KNfUIAPFwxUgvxA0TxSWJlW9I4YZVi BAXnPkBIipXGgVuz/q3jgnreXwTppohvWzKme46Ggwn6IlNWzBZLHNlT9XPL87N3X8Au ZHhDSQDmxU+mo+kK8LK9PwCDiPabcmL7ijxd7ZCMRXMIVwn9As+APnl/Wn69+ljCnC2w LozwpuIsjahiJvVYkSknBenfLpNM3HlkPL9eU6wVcUsQ/rIQdeORZOKo4VE3yzmojzoL XeTKx7kxRyy/hz9MKMAAKDa84zIfMNy5vy+8SqqDTzeoMOYa3Yph9TgusaDZvJkWgQ0Y u18g== X-Gm-Message-State: ALoCoQl+tIwJAqoCpKz6P8m7Ik2ieC8RHoE5LicdUOBdwqbt/yo4efS+yytQHrtero+/X+yP7BoX X-Received: by 10.224.86.2 with SMTP id q2mr26528728qal.1.1421140835226; Tue, 13 Jan 2015 01:20:35 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.23.102 with SMTP id 93ls3142472qgo.95.gmail; Tue, 13 Jan 2015 01:20:34 -0800 (PST) X-Received: by 10.140.41.180 with SMTP id z49mr27qgz.30.1421140834682; Tue, 13 Jan 2015 01:20:34 -0800 (PST) In-Reply-To: <9F9D7F25-F862-4358-B074-8F8C87255E2A@gmail.com> X-Original-Sender: vlad.moscow@mail.ru 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:15623 Archived-At: ------=_Part_2754_1091509529.1421140834165 Content-Type: multipart/alternative; boundary="----=_Part_2755_727983994.1421140834165" ------=_Part_2755_727983994.1421140834165 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable I am sorry for my silly question. What is Urbana? On Tuesday, January 13, 2015 at 4:18:18 AM UTC+3, David Krauss wrote: > > > On 2015=E2=80=9301=E2=80=9313, at 6:43 AM, Thiago Macieira > wrote: > > Note that the difference is whether the intrinsic functions are considere= d > =20 > constexpr or not. For GCC, __builtin_ldexp is constexpr but isn't for=20 > Clang: > > > For GCC, most of is constexpr because it has supported=20 > compile-time evaluation of constant floating-point expressions since time= =20 > immemorial. Only in C++11 (once constexpr extensions were forbidden) did= =20 > this extension become nonconforming. > > I almost finished a paper for Urbana, =E2=80=9CRefining floating-point co= nstexpr,=E2=80=9D=20 > but ultimately I had enough other material, and the implementations kept= =20 > evolving under my feet. I should finish it and find a presenter for Lenex= a.=20 > Co-authors are welcome! > --=20 ---=20 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 e= mail 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-proposa= ls/. ------=_Part_2755_727983994.1421140834165 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
I am sorry for my silly question. What is  Urbana?
On Tuesday, January 13, 2015 at 4:18:18 AM UTC+3, David Krauss wrote:<= blockquote class=3D"gmail_quote" style=3D"margin: 0px 0px 0px 0.8ex; paddin= g-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px;= border-left-style: solid;">

<= div>
On 2015=E2=80=9301=E2=80=9313, at 6:43 A= M, Thiago Macieira <thi...@macieira= ..org> wrote:

Note that the difference is wh= ether the intrinsic functions are considered 
constexpr or not. For GCC,= __builtin_ldexp is constexpr but isn't for Clang:

For GCC, most of= <cmath> is constexpr because it has su= pported compile-time evaluation of constant floating-point expressions sinc= e time immemorial. Only in C++11 (once constexpr extensions were forbidden) did this extension become nonconforming.

I almost finished a paper for Urbana, =E2=80=9CRefini= ng floating-point constexpr,=E2=80=9D but ultimately I had enough other mat= erial, and the implementations kept evolving under my feet. I should finish= it and find a presenter for Lenexa. Co-authors are welcome!

--

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