Re: Challenge: optimizing isqrt

From	Serhiy Storchaka <storchaka@gmail.com>
Subject	Re: Challenge: optimizing isqrt
Date	2014-11-26 18:24 +0200
References	<54543787$0$13005$c3e8da3$5496439d@news.astraweb.com> <m4la9e$5hl$1@ger.gmane.org> <CAP=-cKWj5yeL34GG5ay4v-V9i6nuTgF3VvmC8=PDOYruwp8q5Q@mail.gmail.com> <m52lhi$4sq$1@ger.gmane.org> <547522DD.1020201@davea.name>
Newsgroups	comp.lang.python
Message-ID	<mailman.16344.1417019187.18130.python-list@python.org> (permalink)

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On 26.11.14 02:46, Dave Angel wrote:
> Unfortunately, for many values, the version of the function with >>1 is
> slower.  It's only when the argument is bigger than 10**40 that it's as
> much as 1% faster.  But it's true that for really large values, it's
> quicker.

Note that this path is used only for values above 2**53 (about 10**16). 
For all tested values from 10**16 to 10**40 the difference between two 
versions is not larger than 1% (in one or other direction). But the 
difference between different runs of the benchmark for the same version 
vary about 1%. So the difference between versions in this range doesn't 
matter.

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Challenge: optimizing isqrt Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-11-01 12:29 +1100
  Re: Challenge: optimizing isqrt Chris Angelico <rosuav@gmail.com> - 2014-11-01 13:12 +1100
  Re: Challenge: optimizing isqrt Christian Gollwitzer <auriocus@gmx.de> - 2014-11-01 09:02 +0100
    Re: Challenge: optimizing isqrt Christian Gollwitzer <auriocus@gmx.de> - 2014-11-01 09:09 +0100
    Re: Challenge: optimizing isqrt Chris Angelico <rosuav@gmail.com> - 2014-11-01 19:13 +1100
      Re: Challenge: optimizing isqrt Christian Gollwitzer <auriocus@gmx.de> - 2014-11-01 09:25 +0100
        Re: Challenge: optimizing isqrt Chris Angelico <rosuav@gmail.com> - 2014-11-01 19:33 +1100
          Re: Challenge: optimizing isqrt Christian Gollwitzer <auriocus@gmx.de> - 2014-11-01 09:38 +0100
            Re: Challenge: optimizing isqrt Chris Angelico <rosuav@gmail.com> - 2014-11-01 19:45 +1100
  Re: Challenge: optimizing isqrt Akira Li <4kir4.1i@gmail.com> - 2014-11-01 12:12 +0300
  Re: Challenge: optimizing isqrt Serhiy Storchaka <storchaka@gmail.com> - 2014-11-20 20:00 +0200
  Re: Challenge: optimizing isqrt Stephen Tucker <stephen_tucker@sil.org> - 2014-11-21 08:15 +0000
  Re: Challenge: optimizing isqrt Dave Angel <davea@davea.name> - 2014-11-23 10:43 -0500
  Re: Challenge: optimizing isqrt Serhiy Storchaka <storchaka@gmail.com> - 2014-11-25 21:31 +0200
  Re: Challenge: optimizing isqrt Dave Angel <davea@davea.name> - 2014-11-25 19:46 -0500
  Re: Challenge: optimizing isqrt Stephen Tucker <stephen_tucker@sil.org> - 2014-11-26 07:57 +0000
    Re: Challenge: optimizing isqrt Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-11-26 21:25 +1100
  Re: Challenge: optimizing isqrt Serhiy Storchaka <storchaka@gmail.com> - 2014-11-26 18:24 +0200

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