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Groups > comp.lang.forth > #52178 > unrolled thread

Stack Operator Symbols

Started bytrans <transfire@gmail.com>
First post2016-10-24 20:42 -0700
Last post2016-10-30 18:19 +0100
Articles 5 on this page of 65 — 19 participants

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  Stack Operator Symbols trans <transfire@gmail.com> - 2016-10-24 20:42 -0700
    Re: Stack Operator Symbols hughaguilar96@gmail.com - 2016-10-25 01:58 -0700
    Re: Stack Operator Symbols november.nihal@gmail.com - 2016-10-25 10:52 -0700
    Re: Stack Operator Symbols Rod Pemberton <NeedNotReplyHere@xrsevnneqk.cem> - 2016-10-27 19:13 -0400
      Re: Stack Operator Symbols "Elizabeth D. Rather" <erather@forth.com> - 2016-10-27 17:08 -1000
        Re: Stack Operator Symbols "HAA" <someone@microsoft.com> - 2016-10-28 21:53 +1000
          Re: Stack Operator Symbols hughaguilar96@gmail.com - 2016-10-28 20:42 -0700
            Re: Stack Operator Symbols Walter Banks <walter@bytecraft.com> - 2016-10-29 17:15 -0400
              Re: Stack Operator Symbols hughaguilar96@gmail.com - 2016-10-29 17:27 -0700
          Re: Stack Operator Symbols "Elizabeth D. Rather" <erather@forth.com> - 2016-10-28 20:56 -1000
        Re: Stack Operator Symbols Paul Rubin <no.email@nospam.invalid> - 2016-10-29 00:46 -0700
          Re: Stack Operator Symbols Andrew Haley <andrew29@littlepinkcloud.invalid> - 2016-10-29 04:30 -0500
            Re: Stack Operator Symbols rickman <gnuarm@gmail.com> - 2016-10-29 16:58 -0400
            Re: Stack Operator Symbols Paul Rubin <no.email@nospam.invalid> - 2016-10-29 14:21 -0700
              Re: Stack Operator Symbols Andrew Haley <andrew29@littlepinkcloud.invalid> - 2016-10-30 04:03 -0500
                Re: Stack Operator Symbols Paul Rubin <no.email@nospam.invalid> - 2016-10-30 18:06 -0700
                  Re: Stack Operator Symbols Spiros Bousbouras <spibou@gmail.com> - 2016-10-31 01:43 +0000
                    Re: Stack Operator Symbols Paul Rubin <no.email@nospam.invalid> - 2016-10-30 19:23 -0700
                      Re: Stack Operator Symbols Andrew Haley <andrew29@littlepinkcloud.invalid> - 2016-10-31 05:13 -0500
                        Re: Stack Operator Symbols albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2016-10-31 12:42 +0100
                        Re: Stack Operator Symbols anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-10-31 12:12 +0000
                          Re: Stack Operator Symbols anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-10-31 14:49 +0000
                            Re: Stack Operator Symbols mhx@iae.nl - 2016-10-31 13:17 -0700
                            Re: Stack Operator Symbols anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-11-03 16:38 +0000
                      Re: Stack Operator Symbols Spiros Bousbouras <spibou@gmail.com> - 2016-11-20 14:33 +0000
                  Re: Stack Operator Symbols anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-10-31 08:35 +0000
              Re: Stack Operator Symbols anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-10-30 11:01 +0000
                Re: Stack Operator Symbols hughaguilar96@gmail.com - 2016-10-30 10:01 -0700
              Re: Stack Operator Symbols hughaguilar96@gmail.com - 2016-11-03 14:46 -0700
                Re: Stack Operator Symbols anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-11-04 23:04 +0000
                  Re: Stack Operator Symbols Rod Pemberton <NeedNotReplyHere@xrsevnneqk.cem> - 2016-11-05 03:16 -0400
          Re: Stack Operator Symbols peter.m.falth@gmail.com - 2016-10-29 09:13 -0700
            Re: Stack Operator Symbols "HAA" <someone@microsoft.com> - 2016-10-30 08:47 +1100
              Re: Stack Operator Symbols trans <transfire@gmail.com> - 2016-10-29 14:57 -0700
                Re: Stack Operator Symbols "HAA" <someone@microsoft.com> - 2016-10-30 09:20 +1100
          Re: Stack Operator Symbols Rod Pemberton <NeedNotReplyHere@xrsevnneqk.cem> - 2016-10-29 18:46 -0400
            Re: Stack Operator Symbols Paul Rubin <no.email@nospam.invalid> - 2016-10-29 19:45 -0700
              Re: Stack Operator Symbols hughaguilar96@gmail.com - 2016-10-29 20:29 -0700
                Re: Stack Operator Symbols hughaguilar96@gmail.com - 2016-10-29 20:47 -0700
                  Re: Stack Operator Symbols Cecil Bayona <cbayona@cbayona.com> - 2016-10-29 23:15 -0500
                    Re: Stack Operator Symbols "Elizabeth D. Rather" <erather@forth.com> - 2016-10-29 21:37 -1000
                      Re: Stack Operator Symbols hughaguilar96@gmail.com - 2016-10-30 10:07 -0700
              Re: Stack Operator Symbols "Elizabeth D. Rather" <erather@forth.com> - 2016-10-29 21:35 -1000
                Re: Stack Operator Symbols "HAA" <someone@microsoft.com> - 2016-10-31 13:11 +1100
                  Re: Stack Operator Symbols hughaguilar96@gmail.com - 2016-10-30 20:02 -0700
                  Re: Stack Operator Symbols "Elizabeth D. Rather" <erather@forth.com> - 2016-10-30 22:08 -1000
                  Re: Stack Operator Symbols anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-10-31 09:02 +0000
                    Re: Stack Operator Symbols "HAA" <someone@microsoft.com> - 2016-11-03 20:49 +1100
                      Re: Stack Operator Symbols anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-11-03 15:33 +0000
                        Re: Stack Operator Symbols Rod Pemberton <NeedNotReplyHere@xrsevnneqk.cem> - 2016-11-03 16:55 -0400
                          Re: Stack Operator Symbols anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-11-03 22:21 +0000
    Re: Stack Operator Symbols hughaguilar96@gmail.com - 2016-10-27 20:31 -0700
      Re: Stack Operator Symbols november.nihal@gmail.com - 2016-10-28 09:52 -0700
        Re: Stack Operator Symbols hughaguilar96@gmail.com - 2016-10-28 20:32 -0700
    Re: Stack Operator Symbols Mark Wills <markwills1970@gmail.com> - 2016-10-30 04:49 -0700
      Re: Stack Operator Symbols Coos Haak <htrofhc@gmail.com> - 2016-10-30 14:49 +0100
        Re: Stack Operator Symbols Matthias Koch <matthias.koch@hot.uni-hannover.de> - 2016-10-31 13:31 +0100
          Re: Stack Operator Symbols Coos Haak <htrofhc@gmail.com> - 2016-10-31 14:12 +0100
            Re: Stack Operator Symbols Matthias Koch <matthias.koch@hot.uni-hannover.de> - 2016-10-31 15:03 +0100
          Re: Stack Operator Symbols Mark Wills <markwills1970@gmail.com> - 2016-11-03 14:22 -0700
            Re: Stack Operator Symbols Coos Haak <htrofhc@gmail.com> - 2016-11-04 00:46 +0100
          Re: Stack Operator Symbols "HAA" <someone@microsoft.com> - 2016-11-05 13:14 +1100
      Re: Stack Operator Symbols trans <transfire@gmail.com> - 2016-10-30 06:50 -0700
        Re: Stack Operator Symbols trans <transfire@gmail.com> - 2016-10-30 08:56 -0700
        Re: Stack Operator Symbols albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2016-10-30 18:19 +0100

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#52428

FromCoos Haak <htrofhc@gmail.com>
Date2016-11-04 00:46 +0100
Message-ID<xs36tuorcwqx$.y6x07o1kw31h.dlg@40tude.net>
In reply to#52419
Op Thu, 3 Nov 2016 14:22:11 -0700 (PDT) schreef Mark Wills:

> On Monday, 31 October 2016 12:28:10 UTC, Matthias Koch  wrote:
>>> From Forth-79.pdf:
>>> 
>>><     n1 --- n2
>>>   Swap the high and low bytes within n1. "byte-swap"
>>> 
>>> I don't know if anyone still uses this ;-)
>> 
>> I do occasionally. MSP430 chips have an opcode for it :-)
>> 
>> Matthias
> 
> It's useful on big-endian systems that favour the high-byte. It's essential
> on the TMS99xx family.

Why would a big-endian system need this more than a little-endian?

groet Coos

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#52449

From"HAA" <someone@microsoft.com>
Date2016-11-05 13:14 +1100
Message-ID<nvjfaa$1j9e$1@gioia.aioe.org>
In reply to#52336
Matthias Koch wrote:
> > From Forth-79.pdf:
> >
> ><     n1 --- n2
> >   Swap the high and low bytes within n1. "byte-swap"
> >
> > I don't know if anyone still uses this ;-)
>
> I do occasionally. MSP430 chips have an opcode for it :-)
>
> Matthias

And CRC processing.  As long as 8 bits remains useful as a
minimum size for encoding chunks of data, there will be uses
for ><.  What's the alternative - shifting bits.

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#52310

Fromtrans <transfire@gmail.com>
Date2016-10-30 06:50 -0700
Message-ID<516fa81e-1bce-47c8-8abd-c4e8a37bf3de@googlegroups.com>
In reply to#52308
On Sunday, October 30, 2016 at 7:49:47 AM UTC-4, Mark Wills wrote:
> On Tuesday, 25 October 2016 04:43:00 UTC+1, trans  wrote:
> > I was looking at various Unicode symbols today[1], and noticing that there are symbols for Arithmetic, Calculus, Logic, Set Theory, even Music. Stack manipulation seems pretty fundamental to me. I wonder why standard symbols have never been put forth for them?
> 
> : |> ( n - n n ) dup ;
> : <| ( n n - n ) drop ;
> : >< ( a b -- b a ) swap ;

I kind of like, though the the first two remind me more of push and pull. I had been playing with,

  : |<- push ;
  : |-> pull ;
  : <>  swap ;
  : ><  drop ;

Also, nice thing about your first two is that they translate well to Unicode symbols.

  : ◁ 
  : ▷

For drop, Unicode ⌫ makes some sense, though I find it a bit small.

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#52311

Fromtrans <transfire@gmail.com>
Date2016-10-30 08:56 -0700
Message-ID<f39ef56c-681c-4a7f-b0ca-8ea8373c145a@googlegroups.com>
In reply to#52310
On Sunday, October 30, 2016 at 9:50:05 AM UTC-4, trans wrote:
> 
> For drop, Unicode ⌫ makes some sense, though I find it a bit small.

Or too big depending on the typeface... strange.

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#52314

Fromalbert@cherry.spenarnc.xs4all.nl (Albert van der Horst)
Date2016-10-30 18:19 +0100
Message-ID<nv5a26$vpu$1@cherry.spenarnc.xs4all.nl>
In reply to#52310
In article <516fa81e-1bce-47c8-8abd-c4e8a37bf3de@googlegroups.com>,
trans  <transfire@gmail.com> wrote:
>On Sunday, October 30, 2016 at 7:49:47 AM UTC-4, Mark Wills wrote:
>> On Tuesday, 25 October 2016 04:43:00 UTC+1, trans  wrote:
>> > I was looking at various Unicode symbols today[1], and noticing that th=
>ere are symbols for Arithmetic, Calculus, Logic, Set Theory, even Music. St=
>ack manipulation seems pretty fundamental to me. I wonder why standard symb=
>ols have never been put forth for them?
>>=20
>> : |> ( n - n n ) dup ;
>> : <| ( n n - n ) drop ;
>> : >< ( a b -- b a ) swap ;
>
>I kind of like, though the the first two remind me more of push and pull. I=
> had been playing with,
>
>  : |<- push ;
>  : |-> pull ;
>  : <>  swap ;
>  : ><  drop ;
>
>Also, nice thing about your first two is that they translate well to Unicod=
>e symbols.
>
>  : =E2=97=81=20
>  : =E2=96=B7
>
>For drop, Unicode =E2=8C=AB makes some sense, though I find it a bit small.

This is not productive. Special symbols in math work because in math
a formula is a two dimensional layout.
Forth is one-dimensional. Remember the stress on pronunciation that
makes it possible to communicate a Forth program over the phone?
This of course has to do with the fact that Chuck Moore is vision-
impaired.

Groetjes Albert

(I would hate to have to input unicode symbols in Forth.)
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert@spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst

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