220 38159 article Path: news.gmane.org!.POSTED!not-for-mail From: "dgutson ." Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: memcpy/memset/etc overloads for volatile memory Date: Wed, 23 May 2018 12:33:02 -0300 Lines: 149 Approved: news@gmane.org Message-ID: References: <5B0520CD.30204@gmx.net> <1695197.Kxq4M8jdJr@tjmaciei-mobl1> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="00000000000026e3b3056ce1401d" X-Trace: blaine.gmane.org 1527089458 7987 195.159.176.226 (23 May 2018 15:30:58 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 23 May 2018 15:30:58 +0000 (UTC) To: std-proposals Original-X-From: std-proposals+bncBDE3NBMV6UFBBMETS3MAKGQEAGHYMSQ@isocpp.org Wed May 23 17:30:54 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qk0-f197.google.com ([209.85.220.197]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fLVj3-0001y8-N7 for gclcip-std-proposals@m.gmane.org; Wed, 23 May 2018 17:30:53 +0200 Original-Received: by mail-qk0-f197.google.com with SMTP id d71-v6sf6310908qkg.0 for ; Wed, 23 May 2018 08:33:05 -0700 (PDT) ARC-Seal: i=2; a=rsa-sha256; t=1527089584; cv=pass; d=google.com; s=arc-20160816; b=Pf2dUbVhXq8RNC++fVOZTB601S+YjcRSZ3NwhvDjDyfx5EfRrasp6HGTs04VUHgTJb mflmzljmuYk0ZnTOwsO4Z+nZJR0xU9ob6BgwVCzK+v2zBBUJf7I6vXmkeo1lLmJn9wrR wS/jVkAHYw+wpqzfww45RyM8+diZ+8YL3778HvoUaM4ZmGW2PJglSrxh3AYqxFlT62Um eIMoR6D4H0wkz4kBTpW3/FuJIjRt/ZIaGeV+xJCQMsju5+sujmSpVhX1oKJkQl3773ev XmYvAZPTb0nBv1GugwDCyqMTxHskf/iidR55qhmDJ/nNot+WIHtsUKUTGER/hVaWU0Pe 9yrA== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-unsubscribe:list-subscribe:list-archive:list-help:list-post :list-id:mailing-list:precedence:reply-to:to:subject:message-id:date :from:references:in-reply-to:mime-version:arc-authentication-results :arc-message-signature:dkim-signature:arc-authentication-results; bh=Ifhx9yy41PX3r06zG+c3rzJLJ1SCQT5/hHwp7RMHZDU=; b=yrdk0hBTkyjrOx2FI/9BkMPHTGNo7s2uJHXJamasbcIIu6m9JshVy9qJS1dJSow2Is Awcgq2e+wbzXoiBdGuXc2b/wIowSjQQlbUGzUVRAH1iC5/uxHAwkqkMw/WhDD/NXhrNt Bxqg3pHdccytc3A6PRxIkPEnxOYFenUhXjwWoqF/Jftv3lFjBmmAWlgw8OrdUD7ToyT6 e8pzv16Guzrla1oygakyLPwkYgNGPj3orKk7FvuSQcsSaW4dNeQk1qArFJ7fxZ9S2iQR g9ncFMHanhR82/sFG8BF5x5XCsVPuOLZmaB0416Y7tMMArhX18jijGq8lfZdQ0mZcRef rq+g== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=N74uwANX; spf=pass (google.com: domain of danielgutson@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=danielgutson@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=Ifhx9yy41PX3r06zG+c3rzJLJ1SCQT5/hHwp7RMHZDU=; b=KXHLD7fGu7fDXUxiAiBeO9N/M5d0j7qjn/tYVcjOQxb/OY4u/lVNxlFKumkhqnXm0I 7YWCqyDPfvpz9ZAscRXWG+BN0yQnnM8tCysKQ2YwzVNeO7NM/QllXvMFfhY/ktKZjPSl RXTByzpLQlzPoeWITHx1ldt2IrhEdWuO6u6iuFc8pbp1idZu+eIC7GYcnqCxND478yG9 duvjQZUGUmWEWF+WklRRf5HKW5vm5fmWFTpQu/9L9h5NVmbZnkBcrs1T5ksQiyAS6VIx 8icGf8tiRnhgcoh4DyEzrt6veeDHVS+oxDyNVk0YQnn+iCZigBIdrDvg4vRFRHm6jQjo nnCw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to: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=Ifhx9yy41PX3r06zG+c3rzJLJ1SCQT5/hHwp7RMHZDU=; b=Li3jwktjK/kozZ3eRcCBScXb6dstQ0w6y2+eL+eY2dUV8U6SFgNKYnr69mUpMxb8Nr uguZANsQ0TdvBW/OGDURehZXJNHchQvOHJ3cARICusHAIOvU2TRwPDwvyrGabr9BfTTV roTR/OUJcsHCXyR80vM3PPv3AlJCqQQkaqqjaabz4cDAer++95HmRnOeyS9lYsnip/3i G05Z0cq6yiGVpbi5LSuCOA0cocc2HohK0gmhn+DrBn4D+RXL/lixOx3YY4IEegF6h/dQ afZsUkVNpc8D1kMb2mg+/jy4eKbJ+do0SnkXqaumbODNqTfqg14AVVjOZFRFhLbjj0+I ycfw== X-Gm-Message-State: ALKqPwcCYOoOP8yheKMxJyrapD4OaOv+MMtkfnraxPXSj/gPdWD/Q6M2 g9OwmhJwgf0k3WXQFKSZgsJi1w== X-Google-Smtp-Source: AB8JxZrXPYqRP6TnxCzQx8tBGleFfWAu/4VHl/xe9z3K5uvKakBN9uyJ3VRQGZ04WtotkX+kRULmKA== X-Received: by 2002:a0c:e787:: with SMTP id x7-v6mr1655168qvn.17.1527089584854; Wed, 23 May 2018 08:33:04 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 2002:a0c:a365:: with SMTP id u92-v6ls8773979qvu.8.gmail; Wed, 23 May 2018 08:33:03 -0700 (PDT) X-Received: by 2002:a0c:d442:: with SMTP id r2-v6mr3070066qvh.77.1527089583891; Wed, 23 May 2018 08:33:03 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1527089583; cv=none; d=google.com; s=arc-20160816; b=P8GMBG3799S1GrsMChf0hHUhYOxd2GgSN7JeW8aaHGlkYX7mEYBjns9NudX/1MR8IA xWXlzqIog/gCTtF9igmZyrQ92kmNOzzc3YXWUyu8gnNhHwclLqCqkhVM0PjNjq54Oeop Gq+y5XJducwJKcODx0/kzmSnO+O+GiWovdl9Gdb3D0UzV7FKGv/q/N9gsuSniAGQVlHj v62kga28GGSn0D2pndnmPZO3oRr1FLq1JI1lg7oljhNdBDY4qM77rTH/QUrUtkLirH5Z MDXs6VuYew8Yhqayvpiqj+VuJqVeq46dh5mZhU9v98NUKEd/flz3CI9wpUKXEIvvPTK8 +fHA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=to:subject:message-id:date:from:references:in-reply-to:mime-version :dkim-signature:arc-authentication-results; bh=M7qbrIL2UEndTbeH29N2kXBencsLaHn4VrDIoRg/W3w=; b=Xu2ZbW6OM8vC1vsAhZY4eRqwzet60b835x1KnanZ/Ih7riagbBWgoJOCBqdIofPfrR HTsbmiql3R4PiRsKVOzLaS+m8HCYHoyuG2DjZWYKAzOj/Twwm2BZ7IBvzzWQYQFVqtKV Z8sfuAcvKHHNVimO1ZGXfpKbRJziVfHd9toguAw0gnfhTTSD0hpMKrDgjHtY7sLx/yQp wVnzYi6GB33k8V9boqi3l/v+UfvSDdHyo6uEwomaVf5ctHv7meOWz7FeQVdADFFCeQWd O3revOt+glKZsAdV8WFMUc0sW5Nzzysa2yRFPbNZPYHLoLn4lzogpRXx1AJKaD/wLdv7 gJIA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=N74uwANX; spf=pass (google.com: domain of danielgutson@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=danielgutson@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Original-Received: from mail-sor-f41.google.com (mail-sor-f41.google.com. [209.85.220.41]) by mx.google.com with SMTPS id y39-v6sor10406613qvc.41.2018.05.23.08.33.03 for (Google Transport Security); Wed, 23 May 2018 08:33:03 -0700 (PDT) Received-SPF: pass (google.com: domain of danielgutson@gmail.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; X-Received: by 2002:a0c:bd23:: with SMTP id m35-v6mr3002757qvg.127.1527089583283; Wed, 23 May 2018 08:33:03 -0700 (PDT) Original-Received: by 2002:a0c:acac:0:0:0:0:0 with HTTP; Wed, 23 May 2018 08:33:02 -0700 (PDT) In-Reply-To: <1695197.Kxq4M8jdJr@tjmaciei-mobl1> X-Original-Sender: danielgutson@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=N74uwANX; spf=pass (google.com: domain of danielgutson@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=danielgutson@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com 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:38159 Archived-At: --00000000000026e3b3056ce1401d Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, May 23, 2018 at 12:13 PM, Thiago Macieira wrote: > On Wednesday, 23 May 2018 10:31:15 -03 dgutson . wrote: > > I think that we could think about some requirements packed in something > > like a memory_traits, where it would specify: > > - pointer type (optionally volatile-qualified) > > - alignment requirements > > - memory synchronization needs / specifications (an enumerator) > > - vectorization habilities > > Or, like I said, you can roll out your own memcpy or memset (which are > quite > trivial) if you have specific requirements. > I propose to leave "triviality" out of the discussion, since this can get combinatoric complex, and there is no metric of "triviality" either. There are many std functions that are arguably trivial as well, and despite that, they are in the STL because people use them. We can keep arguing about triviality, what is trivial and what isn't, and we will end up comparing somebody with Hitler as per Godwin's Law. Please forgive me, I sincerely respect you but this is not a discussion I would like to have. > > -- > Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org > Software Architect - Intel Open Source Technology Center > > > > -- > 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/1695197.Kxq4M8jdJr%40tjmaciei-mobl1. > --=20 Who=E2=80=99s got the sweetest disposition? One guess, that=E2=80=99s who? Who=E2=80=99d never, ever start an argument? Who never shows a bit of temperament? Who's never wrong but always right? Who'd never dream of starting a fight? Who get stuck with all the bad luck? --=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/CAFdMc-2o%3DSKNdmiy_fnnWWJ%2B3%2BZkbh2sKU4pks40h= gS3md%3DMNA%40mail.gmail.com. --00000000000026e3b3056ce1401d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Wed, May 23, 2018 at 12:13 PM, Thiago Macieira <= ;thiago@macieira.o= rg> wrote:
On Wednesday, 23 May 2018 10:31:15 -03 dgutson . wrote:
> I think that we could think about some requirements packed in somethin= g
> like a memory_traits, where it would specify:
>=C2=A0 =C2=A0- pointer type (optionally volatile-qualified)
>=C2=A0 =C2=A0- alignment requirements
>=C2=A0 =C2=A0- memory synchronization needs / specifications (an enumer= ator)
>=C2=A0 =C2=A0- vectorization habilities

Or, like I said, you can roll out your own memcpy or memset (which a= re quite
trivial) if you have specific requirements.

=
I propose to leave "triviality" out of the discussion, since= this can get combinatoric complex, and there is no metric of "trivial= ity" either.
There are many std functions that are arguably = trivial as well, and despite that, they are in the STL because people use t= hem.
We can keep arguing about triviality, what is trivial and wh= at isn't, and we will end up comparing somebody with Hitler as per Godw= in's Law.
Please forgive me, I sincerely respect you but this= is not a discussion I would like to have.
=C2=A0

--
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
=C2=A0 =C2=A0Software Architect - Intel Open Source Technology Center



--
You received this message because you are subscribed to the Google Groups &= quot;ISO C++ Standard - Future Proposals" group.
To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-propo= sals+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/1695197.Kxq4M8jdJr%40tjmaciei-= mobl1.



--
Who=E2=80=99s got t= he sweetest disposition?
One guess, that=E2=80=99s who?
Who=E2=80=99d= never, ever start an argument?
Who never shows a bit of temperament?Who's never wrong but always right?
Who'd never dream of starti= ng a fight?
Who get stuck with all the bad luck?

--
You received this message because you are subscribed to the Google Groups &= quot;ISO C++ Standard - Future Proposals" group.
To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposa= ls+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/CAFdMc-2o= %3DSKNdmiy_fnnWWJ%2B3%2BZkbh2sKU4pks40hgS3md%3DMNA%40mail.gmail.com. --00000000000026e3b3056ce1401d-- .