220 35639 article Path: news.gmane.org!.POSTED!not-for-mail From: Andrey Semashev Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Rotational shift operator Date: Thu, 30 Nov 2017 04:56:36 +0300 Lines: 18 Approved: news@gmane.org Message-ID: References: <69593098-e2cc-487e-bd14-9001b27aa7c1@isocpp.org> <3c658e5d-00ba-dafe-366f-7c1ea80cb533@gmail.com> <15c38bfe-86a0-286c-771d-31710988d76c@gmail.com> <3777412.cVlszARQpW@tjmaciei-mobl1> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" X-Trace: blaine.gmane.org 1512006999 22857 195.159.176.226 (30 Nov 2017 01:56:39 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 30 Nov 2017 01:56:39 +0000 (UTC) To: "ISO C++ Standard - Future Proposals" Original-X-From: std-proposals+bncBCXY5TXHWYJRBVOK7XIAKGQE7VV3HZA@isocpp.org Thu Nov 30 02:56:33 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-oi0-f69.google.com ([209.85.218.69]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eKE5X-0005M1-5h for gclcip-std-proposals@m.gmane.org; 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[209.85.220.41]) by mx.google.com with SMTPS id d186sor1146256oif.134.2017.11.29.17.56.37 for (Google Transport Security); Wed, 29 Nov 2017 17:56:37 -0800 (PST) Received-SPF: pass (google.com: domain of andrey.semashev@gmail.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; X-Received: by 10.202.198.215 with SMTP id w206mr3414682oif.30.1512006996711; Wed, 29 Nov 2017 17:56:36 -0800 (PST) Original-Received: by 10.157.13.52 with HTTP; Wed, 29 Nov 2017 17:56:36 -0800 (PST) In-Reply-To: <3777412.cVlszARQpW@tjmaciei-mobl1> X-Original-Sender: andrey.semashev@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=rtKN+F9Y; spf=pass (google.com: domain of andrey.semashev@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=andrey.semashev@gmail.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=gmail.com 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:35639 Archived-At: On Thu, Nov 30, 2017 at 3:53 AM, Thiago Macieira wrote: > On Wednesday, 29 November 2017 12:43:58 PST Andrey Semashev wrote: >> My point was that allowing overflows doesn't penalize the properly >> written code. At least, not in this case. Poorly written code, well, >> doesn't concern me as much. > > This example I sent is EXACTLY a case of where allowing overflow would have > penalised properly-written code. How? You said you did have a check for overflow, so why would the compiler be unable to optimize away the test you quoted? -- 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. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/CAEhD%2B6B40q%3DVJwEpisCuG-8-VuK8TizdRiVnHnJ7zsYzof7eRw%40mail.gmail.com. .