Re: Endianness

From	anton@mips.complang.tuwien.ac.at (Anton Ertl)
Newsgroups	comp.lang.forth
Subject	Re: Endianness
Date	2017-04-24 16:58 +0000
Organization	Institut fuer Computersprachen, Technische Universitaet Wien
Message-ID	<2017Apr24.185835@mips.complang.tuwien.ac.at> (permalink)
References	<xn0kp08uz8o02ku009@nntp.aioe.org>

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"Rudy Velthuis" <newsgroups@rvelthuis.de> writes:
>I can't really find where it is stated, but I have the impression that
>Forth is, more or less, big-endian.
>
>For instance, I have seen code like:
>
>: U.   0 D. ;
>
>This means that, at least for that Forth, the TOS is the high order
>cell of a double word. Is this true for all Forth implementations, or
>is this just implementation defined?

It is true of standard implementations.

>If this is the case, is this true for bytes in a cell too, or is that
>implementation defined?

Implementation defined.

>Is it also true, or implementation defined, that the data stack
>generally grows downward?

Implementation defined.

Also of relevance: 2! ( x1 x2 a-addr -- ) stores x2 at a-addr and x1
at the next cell, so if you use it to store a double, you have stored
the double in big-endian order indeed; 2@ reads the items in the
corresponding order.

- 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 2016: http://www.euroforth.org/ef16/

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Endianness "Rudy Velthuis" <newsgroups@rvelthuis.de> - 2017-04-21 20:46 +0000
  Re: Endianness Alex <alex@rivadpm.com> - 2017-04-21 22:48 +0100
    Re: Endianness "Elizabeth D. Rather" <erather@forth.com> - 2017-04-21 12:16 -1000
      Re: Endianness "Rudy Velthuis" <newsgroups@rvelthuis.de> - 2017-04-22 04:42 +0000
        Re: Endianness "Elizabeth D. Rather" <erather@forth.com> - 2017-04-21 21:45 -1000
  Re: Endianness "HAA" <someone@microsoft.com> - 2017-04-22 11:12 +1000
    Re: Endianness "Elizabeth D. Rather" <erather@forth.com> - 2017-04-21 16:11 -1000
      Re: Endianness hughaguilar96@gmail.com - 2017-04-23 13:41 -0700
      Re: Endianness Bernd Paysan <bernd@net2o.de> - 2017-05-07 22:52 +0000
    Re: Endianness "Rudy Velthuis" <newsgroups@rvelthuis.de> - 2017-04-22 04:45 +0000
      Re: Endianness "HAA" <someone@microsoft.com> - 2017-04-23 12:21 +1000
        Re: Endianness Julian Fondren <julian.fondren@gmail.com> - 2017-04-22 22:49 -0700
          Re: Endianness "HAA" <someone@microsoft.com> - 2017-04-23 18:57 +1000
            Re: Endianness Julian Fondren <julian.fondren@gmail.com> - 2017-04-23 02:13 -0700
          Re: Endianness "Rudy Velthuis" <newsgroups@rvelthuis.de> - 2017-04-29 03:37 +0000
      Re: Endianness anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-04-24 16:56 +0000
    Re: Endianness Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-04-23 04:45 -0500
      Re: Endianness "HAA" <someone@microsoft.com> - 2017-04-24 10:09 +1000
        Re: Endianness "Elizabeth D. Rather" <erather@forth.com> - 2017-04-23 14:40 -1000
          Re: Endianness "HAA" <someone@microsoft.com> - 2017-04-24 13:41 +1000
            Re: Endianness "Elizabeth D. Rather" <erather@forth.com> - 2017-04-23 17:58 -1000
              Re: Endianness hughaguilar96@gmail.com - 2017-04-23 21:42 -0700
                Re: Endianness Julian Fondren <julian.fondren@gmail.com> - 2017-04-23 21:58 -0700
            Re: Endianness Julian Fondren <julian.fondren@gmail.com> - 2017-04-23 21:18 -0700
              Re: Endianness Julian Fondren <julian.fondren@gmail.com> - 2017-04-23 21:24 -0700
              Re: Endianness "HAA" <someone@microsoft.com> - 2017-04-26 09:21 +1000
                Re: Endianness Julian Fondren <julian.fondren@gmail.com> - 2017-04-25 16:56 -0700
  Re: Endianness anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-04-24 16:58 +0000

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