Re: Forth without integer data stack. It is even better!

From	rickman <gnuarm@gmail.com>
Newsgroups	comp.lang.forth
Subject	Re: Forth without integer data stack. It is even better!
Date	2015-08-18 00:49 -0400
Organization	A noiseless patient Spider
Message-ID	<mqudct$vbn$1@dont-email.me> (permalink)
References	<ac218bc6-a9cb-47da-b69f-7a612373c302@googlegroups.com> <bbda7b81-5245-4ba3-946b-a9f622b5ee72@googlegroups.com> <5e8b89ea-0fe6-43d4-a067-536d1c2d5125@googlegroups.com>

Show all headers | View raw

On 8/17/2015 11:17 PM, hughaguilar96@gmail.com wrote:
> On Monday, August 17, 2015 at 6:28:18 PM UTC-7, Michael Barry wrote:
>> On Saturday, August 15, 2015 at 7:22:05 PM UTC-7, Ilya V. Vasilyev
>> wrote:
>>> I made Forth implementation without integer data stack. Main
>>> data stack contains float values.
>>>
>>> Here is the summary:
>>> http://the-hacker.ru/2015/ForthWithoutIntegerDataStack.pdf
>>>
>> It is possible that I missed this detail in your .pdf, but my main
>> concern would be that cells used as pointers would be subject to
>> normalization, meaning that floats would have to be translated to
>> address units before being used as memory addresses, in order to
>> prevent chaos, overlap and discontinuity in words that directly
>> accessed data structures.
>
> I don't think this is a problem.
>
> In the Lua book, it was mentioned that a lot of people think that
> floats are "fuzzy" and that an integer stored in a float will somehow
> pick up a fractional part when other integers stored in floats are
> added to it. This isn't true. There is no theoretical basis for this
> belief, and the Lua guys have never run into any problems in
> practice.

That is not strictly true.  As long as you don't exceed the range of the 
mantissa, integers in floating point are exact.  But given that an 
integer can be larger than can be represented in the mantissa (plus the 
hidden bit if used) the floating point number then the low order bits of 
the integer is lost.  This is a fair comparison in that the larger 
integer could be represented exactly in the same number of bits as the 
floating point number.

-- 

Rick

Thread

Forth without integer data stack. It is even better! "Ilya V. Vasilyev" <arvi1973@gmail.com> - 2015-08-15 19:22 -0700
  Re: Forth without integer data stack. It is even better! hughaguilar96@gmail.com - 2015-08-15 20:42 -0700
    Re: Forth without integer data stack. It is even better! "Ilya V. Vasilyev" <arvi1973@gmail.com> - 2015-08-16 02:13 -0700
      Re: Forth without integer data stack. It is even better! hughaguilar96@gmail.com - 2015-08-18 12:09 -0700
        Re: Forth without integer data stack. It is even better! Michael Barry <barrym95838@yahoo.com> - 2015-08-18 15:33 -0700
          Re: Forth without integer data stack. It is even better! Michael Barry <barrym95838@yahoo.com> - 2015-08-18 16:18 -0700
            Re: Forth without integer data stack. It is even better! anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-08-19 08:22 +0000
        Re: Forth without integer data stack. It is even better! "Rod Pemberton" <boo@fasdfrewar.cdm> - 2015-08-19 03:38 -0400
        Re: Forth without integer data stack. It is even better! "Ilya V. Vasilyev" <arvi1973@gmail.com> - 2015-09-19 17:21 -0700
          Re: Forth without integer data stack. It is even better! hughaguilar96@gmail.com - 2015-09-19 21:07 -0700
  Re: Forth without integer data stack. It is even better! "WJ" <w_a_x_man@yahoo.com> - 2015-08-16 06:52 +0000
  Re: Forth without integer data stack. It is even better! Roelf Toxopeus <rt4all@notthis.hetnet.nl> - 2015-08-16 14:19 +0200
    Re: Forth without integer data stack. It is even better! Mark Wills <markwills1970@gmail.com> - 2015-08-16 05:52 -0700
      Re: Forth without integer data stack. It is even better! hughaguilar96@gmail.com - 2015-08-16 14:42 -0700
        Re: Forth without integer data stack. It is even better! dylan.mcnamee@gmail.com - 2015-09-21 12:02 -0700
          Re: Forth without integer data stack. It is even better! Bernd Paysan <bernd.paysan@gmx.de> - 2015-09-22 00:34 +0200
      Re: Forth without integer data stack. It is even better! "WJ" <w_a_x_man@yahoo.com> - 2015-09-26 19:18 +0000
    Re: Forth without integer data stack. It is even better! hughaguilar96@gmail.com - 2015-08-16 12:08 -0700
      Re: Forth without integer data stack. It is even better! rickman <gnuarm@gmail.com> - 2015-08-16 15:17 -0400
  Re: Forth without integer data stack. It is even better! anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-08-16 13:47 +0000
    Re: Forth without integer data stack. It is even better! Paul Rubin <no.email@nospam.invalid> - 2015-08-16 07:54 -0700
      Re: Forth without integer data stack. It is even better! anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-08-16 15:04 +0000
        Re: Forth without integer data stack. It is even better! Bernd Paysan <bernd.paysan@gmx.de> - 2015-08-16 23:56 +0200
          Re: Forth without integer data stack. It is even better! Richard Owlett <rowlett@cloud85.net> - 2015-08-17 05:57 -0500
            Re: Forth without integer data stack. It is even better! Coos Haak <chforth@hccnet.nl> - 2015-08-17 13:52 +0200
              Re: Forth without integer data stack. It is even better! Mark Wills <markwills1970@gmail.com> - 2015-08-17 05:00 -0700
            Re: Forth without integer data stack. It is even better! anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-08-17 12:03 +0000
              Re: Forth without integer data stack. It is even better! Mark Wills <markwills1970@gmail.com> - 2015-08-17 05:29 -0700
                Re: Forth without integer data stack. It is even better! anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-08-18 09:10 +0000
          Re: Forth without integer data stack. It is even better! Roelf Toxopeus <rt4all@notthis.hetnet.nl> - 2015-08-17 14:50 +0200
            Re: Forth without integer data stack. It is even better! Bernd Paysan <bernd.paysan@gmx.de> - 2015-08-17 19:42 +0200
              Re: Forth without integer data stack. It is even better! Roelf Toxopeus <rt4all@notthis.hetnet.nl> - 2015-08-17 23:16 +0200
                Re: Forth without integer data stack. It is even better! Bernd Paysan <bernd.paysan@gmx.de> - 2015-08-18 01:00 +0200
                Re: Forth without integer data stack. It is even better! Bernd Paysan <bernd.paysan@gmx.de> - 2015-08-18 01:17 +0200
                Re: Forth without integer data stack. It is even better! Roelf Toxopeus <rt4all@notthis.hetnet.nl> - 2015-08-18 10:12 +0200
              Re: Forth without integer data stack. It is even better! Александр Стадниченко <stadnichenko.a.s@gmail.com> - 2015-09-26 08:12 -0700
              Re: Forth without integer data stack. It is even better! Александр Стадниченко <stadnichenko.a.s@gmail.com> - 2015-09-26 08:35 -0700
                Re: Forth without integer data stack. It is even better! Bernd Paysan <bernd.paysan@gmx.de> - 2015-09-26 21:23 +0200
                Re: Forth without integer data stack. It is even better! Александр Стадниченко <stadnichenko.a.s@gmail.com> - 2015-09-27 09:55 -0700
                Re: Forth without integer data stack. It is even better! Александр Стадниченко <stadnichenko.a.s@gmail.com> - 2015-09-27 10:00 -0700
    Re: Forth without integer data stack. It is even better! mhx@iae.nl - 2015-08-16 08:37 -0700
  Re: Forth without integer data stack. It is even better! Michael Barry <barrym95838@yahoo.com> - 2015-08-17 18:28 -0700
    Re: Forth without integer data stack. It is even better! hughaguilar96@gmail.com - 2015-08-17 20:17 -0700
      Re: Forth without integer data stack. It is even better! rickman <gnuarm@gmail.com> - 2015-08-18 00:49 -0400
        Re: Forth without integer data stack. It is even better! Michael Barry <barrym95838@yahoo.com> - 2015-08-17 23:00 -0700
          Re: Forth without integer data stack. It is even better! anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-08-18 06:25 +0000
            Re: Forth without integer data stack. It is even better! hughaguilar96@gmail.com - 2015-08-18 08:39 -0700
              Re: Forth without integer data stack. It is even better! rickman <gnuarm@gmail.com> - 2015-08-18 12:09 -0400
  Re: Forth without integer data stack. It is even better! Ilya Tarasov <ilya74.tarasov@gmail.com> - 2015-08-18 01:31 -0700
    Re: Forth without integer data stack. It is even better! "Ilya V. Vasilyev" <arvi1973@gmail.com> - 2015-09-12 17:47 -0700
      Re: Forth without integer data stack. It is even better! hughaguilar96@gmail.com - 2015-09-12 18:06 -0700

csiph-web