Re: Global Warming - Forth as answer

From	rickman <gnuarm@gmail.com>
Newsgroups	comp.lang.forth
Subject	Re: Global Warming - Forth as answer
Date	2013-05-15 11:19 -0400
Organization	A noiseless patient Spider
Message-ID	<kn08r4$nc$1@dont-email.me> (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> <2013May15.170815@mips.complang.tuwien.ac.at>

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On 5/15/2013 11:08 AM, Anton Ertl wrote:
> 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.

Not much information in that reply.  How does that use more energy than 
reversible calculations?


>> 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.

But... by saying OVER + is reversible (which I'm not sure is true in 
this context) it is being used in a longer reversible computation.

Once I'm done with the current work slam, maybe I'll try to dig up the 
article.  If I can figure out which issue, I have a lot of the old back 
issues.

-- 

Rick

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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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