220 41353 article Path: news.gmane.org!.POSTED!not-for-mail From: joel.g.hemphill@gmail.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Optimizing Power Function for Integral Types Date: Thu, 17 Jan 2019 08:02:13 -0800 (PST) Lines: 351 Approved: news@gmane.org Message-ID: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_159_387068105.1547740933607" X-Trace: blaine.gmane.org 1547740813 29895 195.159.176.226 (17 Jan 2019 16:00:13 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 17 Jan 2019 16:00:13 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBC4Y55PCR4BBBB6OQLRAKGQEQHQ4S6A@isocpp.org Thu Jan 17 17:00:09 2019 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yb1-f197.google.com ([209.85.219.197]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gkA5Q-0007aP-Ch for gclcip-std-proposals@m.gmane.org; Thu, 17 Jan 2019 17:00:08 +0100 Original-Received: by mail-yb1-f197.google.com with SMTP id e205sf4267931yba.21 for ; Thu, 17 Jan 2019 08:02:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:message-id:subject:mime-version:x-original-sender :reply-to:precedence:mailing-list:list-id:list-post:list-help :list-archive:list-subscribe:list-unsubscribe; bh=wP75YkN+4dXd7pjj0Gg5aGbgjo01OfYAvkrl6ZHkMQY=; b=UzwCtUMB8+BzvYyM614PAP7obdaS+QmJHK6AjipVSGsvzZBrlE8gQMKLKncoC2lMVS ppeq0ygrNIQ/PO63g70u7NlHUU42ixf5AOx7FZz2JMZXuRYj1v0ZZrw7r07YGBQ8aq5I zJIqMu0fnhmOR5u/m84mNMFo00ajE1ERM0+U9wZKCxrAndiZCIuhROj66vER/kVWvE5W 1nyy0XmOY/pBn9YLk5LGDSnUB3duMpuSK6OKztW2HCVeWApN6yWEYqWa5NXxbRF91xV6 VrOER7WNZNrlNrp/k2hzOAVBBycw9lx0HJJOEhZdJIRsVhR+c+wPJoITwRDwhBHOsQYt 85rA== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:message-id:subject:mime-version:x-original-sender :reply-to:precedence:mailing-list:list-id:list-post:list-help :list-archive:list-subscribe:list-unsubscribe; bh=wP75YkN+4dXd7pjj0Gg5aGbgjo01OfYAvkrl6ZHkMQY=; b=VibLCk9L25KFzH8aaaQDk3HgBJAAAm3cepa5HFu1p10fKT/6D0ME5s4PASnBbfl0OT 78TlLIE4m0AhaQwWUXXTuU8QkSC7+ykEen7i2jABzZU07vG7yYGFMNqB0MSxGiuyIdmP X2ClMX9bQJAQljPFEuPA9tOzgRdgxA2wnKuNCLfOg/EqW2k+9dAaCFjsjX3xgKjIqKnr sFDR1EHLj39QNqiCJyZXw+G2UhiXt2iyPD2/hq7yh4NfMy8pi+6bfY28g5QqIjEqwtYT hymss88GrER843yD5Anhh4yMNclXtmZHWOFjmWnlX77zZHa7MRJ95E1Q3KcfyeD+QgeU joIw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:message-id:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=wP75YkN+4dXd7pjj0Gg5aGbgjo01OfYAvkrl6ZHkMQY=; b=QqCbVUk6VKxqmn3qTryRgyk35Kq3kfYQp1ocIhgD5U8xft7YMtCrSUB5J+bQZBPEPN 46582zvTMMkG6Y50lkNIbBjDm0s5tp0+aRJCjxkTBjuGSxmvmI3ea+LCSiuN+g5WwxVL Pwt10FA1fPCcJT6xdFaBkIM/gB7o4IPHID3R8ZKwTzxyyHan7jlUV/5ALxQKCjLl4d0v eqPN+Ihod75sYctRPLxRVvUtmBIbXR1GcA1ulHM3plsflgM+QROgR3dA/J12NWIciXA/ hajV2M+AxiDKlvwgnkpmsMDOvVe/PzkdHQVvJ/nRyosnIZDPdIQ5h1/TmR03DAlmSjNF XjlA== X-Gm-Message-State: AJcUukfmLksDs23mJb3lvni8ETLGvxXxVequZvz5lLkAE7/L/1UC13Ah DrbP4M3cUb7z50BsoPr6bClFpA== X-Google-Smtp-Source: ALg8bN6vs24jHsTE0doEVa3d0SeyNW9YbVuOB6DRirHxJk/5gPGOMWZyCi7mwLtPJRPc8LZFKX7zZQ== X-Received: by 2002:a25:c64e:: with SMTP id k75mr1240550ybf.90.1547740938895; Thu, 17 Jan 2019 08:02:18 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 2002:a81:3084:: with SMTP id w126ls4371788yww.4.gmail; Thu, 17 Jan 2019 08:02:14 -0800 (PST) X-Received: by 2002:a81:450:: with SMTP id 77mr166682ywe.6.1547740934531; Thu, 17 Jan 2019 08:02:14 -0800 (PST) X-Original-Sender: Joel.G.Hemphill@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:41353 Archived-At: ------=_Part_159_387068105.1547740933607 Content-Type: multipart/alternative; boundary="----=_Part_160_1686897718.1547740933607" ------=_Part_160_1686897718.1547740933607 Content-Type: text/plain; charset="UTF-8" As of C++11, per overload 7 of the 'pow' function ( https://en.cppreference.com/w/cpp/numeric/math/pow), integral types can be used as parameters, but they will be cast to double before calculation. I believe that an integral-specific overload should be made, which makes use of faster integer-operations available to CPUs. As a disclaimer, I am still a rather inexperienced programmer (College Sophomore), and I my have some misunderstands as to what would fall under the ISO standard and what would fall under compiler-implementations. As I understand it, the line about "If any argument has integral type, it is cast to double." is a component of the ISO standard. As stated on isocpp.org's FAQ section, this idea is based on existing practices. As discussed here ( https://stackoverflow.com/questions/2398442/why-isnt-int-powint-base-int-exponent-in-the-standard-c-libraries), multiple implementations of this function have been made on a per-user basis, due to its general simplicity and lack of inclusion in previous standards. In the below testing, I created a function using x86 asm. It is worth noting that even with more standard C++ approaches, as testified in the stackoverflow discussion above, a significant performance improvement can be made. For the sake of brevity, the data-table and source have been withheld, but if it is relevant to the conversation, I would be more than willing to provide them. Do any of you agree that this is a useful addition to the C++ standards? *Performance Testing:* Tests were run on an Intel Core i3 6006U @ 2.0GHz Custom Function (VS 2017) : __declspec(naked) __int32 __fastcall powi(__int32 base, __int32 exp) { __asm { ... } } Test Range: base: [-46340, 46340] (int-truncation of the sqrt of MAX_INT) exp: [-19, 19] (highest power of 3, that does not overflow the int type) Results: (Approx. x20 avg. improvement) [image: Untitled.png] *Possible Use-Cases:* Allocation of N-dimensional arrays, with N^M elements. -- 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/fbfec82c-5416-4c96-b53b-ef3d4309b613%40isocpp.org. ------=_Part_160_1686897718.1547740933607 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
As of C++11, per overload 7 of the 'pow' function = (https://en.= cppreference.com/w/cpp/numeric/math/pow), integral types can be used as= parameters, but they will be cast to double before calculation. I believe = that an integral-specific overload should be made, which makes use of faste= r integer-operations available to CPUs.

As a disclaimer,= I am still a rather inexperienced programmer (College Sophomore), and I my= have some misunderstands as to what would fall under the ISO standard and = what would fall under compiler-implementations. As I understand it, the lin= e about "If any argument has integral type,=C2=A0it is cast to double.&qu= ot; is a component of the ISO standard.

As stated on isocpp.org's FAQ section, this idea = is based on existing practices. As discussed here (https://stackov= erflow.com/questions/2398442/why-isnt-int-powint-base-int-exponent-in-the-s= tandard-c-libraries), multiple imple= mentations=C2=A0of this function have been made on a per-user basis, due to= its general simplicity and lack of inclusion in previous standards. In the= below testing, I created a function using x86 asm. It is worth noting that= even with more standard C++ approaches, as testified in the stackoverflow = discussion above, a significant performance improvement can be made.=

For the sake of brevity, the data-table and sourc= e have been withheld, but if it is relevant=C2=A0to the conversation, I wou= ld be more than willing to provide them.

Do = any of you agree that this is a useful addition to the C++ standards?

Performance Testing:
<= div>
Tests were run on an Intel Core i3 6006U @ 2.0GHz=

Custom Function (VS 2017) :
__declspec(naked) __int32 __fastcall powi(__int32 base, __int32 exp) { __asm = { ... } }

Test Ra= nge:
base: [-46340, 46340]=C2=A0 (int-truncation of the sqrt of MAX_IN= T)
exp: [-19, 19] (highest power of 3, that does not overflow = the int type)

Results: (Approx. x20 avg. im= provement)

3D"Untitled.=

<= br>

P= ossible Use-Cases:

Allocation of N-dimensional arrays, with N^M elements.

--
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/fbfec82c-5416-4c96-b53b-ef3d4309b613= %40isocpp.org.
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