220 30868 <6822781.nUHQ9xRxne@tjmaciei-mobl1> article Path: news.gmane.org!.POSTED!not-for-mail From: Thiago Macieira Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Detecting compile-time evaluation Date: Fri, 10 Feb 2017 08:47:37 -0800 Lines: 38 Approved: news@gmane.org Message-ID: <6822781.nUHQ9xRxne@tjmaciei-mobl1> References: <86a47916-27c3-4e29-862f-9b4e1f105c1c@isocpp.org> <5b081db0-cc7b-4a5f-b9fe-b9f8ae7ab9f7@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Trace: blaine.gmane.org 1486745273 8914 195.159.176.226 (10 Feb 2017 16:47:53 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 10 Feb 2017 16:47:53 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCB4TK757YBRBMW567CAKGQELNY7VRA@isocpp.org Fri Feb 10 17:47:48 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-io0-f199.google.com ([209.85.223.199]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ccEMI-0001ig-9p for gclcip-std-proposals@m.gmane.org; Fri, 10 Feb 2017 17:47:42 +0100 Original-Received: by mail-io0-f199.google.com with SMTP id q20sf70270774ioi.0 for ; Fri, 10 Feb 2017 08:47:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding: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=k7Z5We+QoXHB1LaQgCTEfp1SezCqcut75TJM6yHxn10=; b=n+4RWb/3fpmy38XHrZtgX/EV0ZIKyyspigOLXeOSx3pJu7pnxZKw67Igj/cOTGDsRn s++LE79DwVVddykBlBAOBI064HW0aes+pCBfdpjAn9T8FHHU8eHZBrWcjyA44MJq1Ce8 F/jKv2DhoVvwe5VhgWHrhsPkqGIrscHqI8FWW048vdedfZdLj8pV16NzMKe5mxqaEkGp qqijruOYjcNuuvqc4lh63Ip9rvInADR2v49lpGAAbCcM9z5OzapUjIx5ug4Vpt70QN51 HzMdZ51njkaugEEgKG0GihkO9bm9SnsBtUNLmXf6A/icfMcrGN1wa4Dm6TX5jV46eiPE ERjg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding: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=k7Z5We+QoXHB1LaQgCTEfp1SezCqcut75TJM6yHxn10=; b=FTLkWvxNk1S1BurmHiBZN7QPOsH/4zkLD8Q1xmCV/U8zwf0Z3xdG/gxLEIJ9gpRBVl AnVPYbUljIl7mQU28tGEZU4qtK1PPslQKggiyaeU4eFCdMDnzVDWz37vV6fFb/iLE8od xyzKHMWukfPPvbP3kjKc3n8qjgl/JvGxNjtfHb/aXx+cVGbGxpP88en6rHOEFFDvO0Gs 8LuJC0JAEjdhNuZI48T0mEDRWIvC5CYlZSpz/i/5WbrFlFqHdjxA2o8FmFvF1HXtwatI IzvkH1AerdIvLJSGKqyGoYbOGsEwURJrJVngAKf5X1Nk/M7zCbbxsrGg2dxolGg+Oapc xSV X-Gm-Message-State: AMke39nyMdjeMZ/Ye9y6DJwXQuxg4H823uj2iH2BafyXywZDq6adH3+m7e5ZU0MfOxN5kw== X-Received: by 10.107.16.143 with SMTP id 15mr3396810ioq.38.1486745267667; Fri, 10 Feb 2017 08:47:47 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.36.107.18 with SMTP id v18ls1439597itc.7.canary-gmail; Fri, 10 Feb 2017 08:47:46 -0800 (PST) X-Received: by 10.36.22.12 with SMTP id a12mr27401367ita.51.1486745266614; Fri, 10 Feb 2017 08:47:46 -0800 (PST) Original-Received: from gondolin.macieira.info (gondolin.macieira.info. [2a01:4f8:d13:f81:21c:14ff:fe01:12a3]) by mx.google.com with ESMTP id k188si1393040ita.95.2017.02.10.08.47.46 for ; Fri, 10 Feb 2017 08:47:46 -0800 (PST) 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-mobl1.localnet (unknown [IPv6:2601:1c0:4501:5f9f:989b:c924:3db1:b2f5]) by gondolin.macieira.info (Postfix) with ESMTPSA id C057E11B5A9 for ; Fri, 10 Feb 2017 08:47:44 -0800 (PST) In-Reply-To: <5b081db0-cc7b-4a5f-b9fe-b9f8ae7ab9f7@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-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:30868 Archived-At: Em sexta-feira, 10 de fevereiro de 2017, =C3=A0s 04:35:38 PST, Gonzalo BG e= screveu: > Do you know how many SSE vector intrinsics and vector types are supported > by the constant expression evaluators of clang, gcc, and msvc? None, don'= t > need to even mention AVX or anything more modern, just plain old 1999's > SSE. Of course. But in our experience, any algorithm that can be complex enough to warrant= =20 SIMD optimisation is too complex for a constexpr inline function. We don't= =20 have any example of that in Qt code. All the ones that would need to be=20 constexpr and have a faster runtime have been so far solved by compiler=20 intrinsics. The closest thing that would come to what you're saying is calculating a=20 string's hash. But we specifically *don't* want to have that inline so that= we=20 can change the algorithm later (right now, I'm considering changing the one= we=20 have based on CRC32 to one based on AES). --=20 Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org Software Architect - Intel Open Source Technology Center --=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. To view this discussion on the web visit https://groups.google.com/a/isocpp= ..org/d/msgid/std-proposals/6822781.nUHQ9xRxne%40tjmaciei-mobl1. .