Re: Global Warming - Forth as answer

From	anton@mips.complang.tuwien.ac.at (Anton Ertl)
Newsgroups	comp.lang.forth
Subject	Re: Global Warming - Forth as answer
Date	2013-05-15 15:08 +0000
Organization	Institut fuer Computersprachen, Technische Universitaet Wien
Message-ID	<2013May15.170815@mips.complang.tuwien.ac.at> (permalink)
References	<6d2b5778-d3e5-4a63-9300-e242bb3db8bf@googlegroups.com> <51935df2$0$6067$e4fe514c@dreader36.news.xs4all.nl> <2013May15.144255@mips.complang.tuwien.ac.at> <kn07f7$o62$1@dont-email.me>

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rickman <gnuarm@gmail.com> writes:
>I don't remember the reversible issue in the article.  How does being 
>irreversible cause a higher energy consumption?

By destroying information.

>I remember learning that in general computation does *not* create 
>information, it actually destroys it, hence is irreversible.  When you 
>perform a computation that clobbers a register, like ADD A,B where the 
>result goes into B, B is lost and so the action is irreversible.  In 
>Forth + may not be reversible, but I think OVER is, unless you are 
>considering the state of the unused stack cell to be "information".

I don't remember the exact argument; maybe it was this; or maybe it
was that OVER cannot be used as a component in a longer reversible
computation because you then need some irreversible step to get rid of
the additional cell; or maybe something else.

- anton
-- 
M. Anton Ertl  http://www.complang.tuwien.ac.at/anton/home.html
comp.lang.forth FAQs: http://www.complang.tuwien.ac.at/forth/faq/toc.html
     New standard: http://www.forth200x.org/forth200x.html
   EuroForth 2013: http://www.euroforth.org/ef13/

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Global Warming - Forth as answer visualforth@rocketmail.com - 2013-05-14 15:21 -0700
  Re: Global Warming - Forth as answer hughaguilar96@yahoo.com - 2013-05-14 18:40 -0700
    Re: Global Warming - Forth as answer Steve <nospam275@gmail.com> - 2013-05-14 21:00 -0700
      Re: Global Warming - Forth as answer visualforth@rocketmail.com - 2013-05-15 22:24 -0700
        Re: Global Warming - Forth as answer Steve <nospam275@gmail.com> - 2013-05-19 19:25 -0700
  Re: Global Warming - Forth as answer albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-05-15 10:05 +0000
    Re: Global Warming - Forth as answer anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-05-15 12:42 +0000
      Re: Global Warming - Forth as answer rickman <gnuarm@gmail.com> - 2013-05-15 10:56 -0400
        Re: Global Warming - Forth as answer anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-05-15 15:08 +0000
          Re: Global Warming - Forth as answer rickman <gnuarm@gmail.com> - 2013-05-15 11:19 -0400
            Re: Global Warming - Forth as answer anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-05-15 15:22 +0000
              Re: Global Warming - Forth as answer rickman <gnuarm@gmail.com> - 2013-05-15 15:42 -0400
                Re: Global Warming - Forth as answer visualforth@rocketmail.com - 2013-05-15 13:45 -0700
                Re: Global Warming - Forth as answer Bernd Paysan <bernd.paysan@gmx.de> - 2013-05-15 23:38 +0200
                Re: Global Warming - Forth as answer anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-05-16 12:53 +0000
                Re: Global Warming - Forth as answer rickman <gnuarm@gmail.com> - 2013-05-16 14:03 -0400
                Re: Global Warming - Forth as answer anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-05-17 12:41 +0000
        Re: Global Warming - Forth as answer albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-05-17 13:17 +0000
          Re: Global Warming - Forth as answer dirk.bruehl@usa.net - 2013-05-17 08:36 -0700
            Re: Global Warming - Forth as answer Steve <nospam275@gmail.com> - 2013-05-19 19:12 -0700
            Re: Global Warming - Forth as answer Steve <nospam275@gmail.com> - 2013-05-20 00:06 -0700
    Re: Global Warming - Forth as answer rickman <gnuarm@gmail.com> - 2013-05-15 10:47 -0400
      Re: Global Warming - Forth as answer albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-05-17 13:23 +0000
        Re: Global Warming - Forth as answer rickman <gnuarm@gmail.com> - 2013-05-17 09:59 -0400
    Re: Global Warming - Forth as answer Steve <nospam275@gmail.com> - 2013-05-19 18:56 -0700
  Re: Global Warming - Forth as answer oh2aun@gmail.com - 2013-05-22 00:50 -0700

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