Re: esp8266 eForth and it's development software

From	Cecil Bayona <cbayona@cbayona.com>
Newsgroups	comp.lang.forth
Subject	Re: esp8266 eForth and it's development software
Date	2017-03-01 21:17 -0600
Organization	A noiseless patient Spider
Message-ID	<o982o4$ib3$1@dont-email.me> (permalink)
References	(5 earlier) <87fuiwfqhr.fsf@nightsong.com> <o97sbi$b5d$1@dont-email.me> <87bmtkfnkq.fsf@nightsong.com> <o981bq$n4c$1@dont-email.me> <877f48fkqx.fsf@nightsong.com>

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On 3/1/2017 8:57 PM, Paul Rubin wrote:
> Cecil Bayona <cbayona@cbayona.com> writes:
>> I'm looking at this because for any CPU that has a C compiler which is
>> just about any CPU in existence one could generate a quickie eForth
>> compiler for it, but to be useful the C code needs to be better than
>> what is at present, mainly eliminate the division,
>
> Do you have an assembly code sample showing this division?
>
> Could you fix the C code to not use a division?  What does the C code
> look like now?
>
>> To work on it and tweak it well it is to my benefit to use decent
>> tools to speed up the process, that why I am currently favoring the
>> use of Rowleys C/C++ compiler (based on GCC)
>
> I didn't know that, I thought the Rowley compiler was independent.
>
>> For ARM and MSP430 I already own MPE Professional compilers but for
>> everything else it would be nice to have a readily available Forth.
>
> eForth is a really cool self-hosted implementation that's lots of fun to
> read, but it's minimalistic and you might want to use some alternative.
>
Rowley uses both their own compiler and GCC, but the interface and many 
of the tools is theirs.

It has code all over the place that will do things like;

IP = data(IP / sizeof(w)); and other similar code where the index into 
an array is calculated using division, the generated code is huge like 
it's not optimizing at all.

IP = instruction pointer in bytes
w is a temporary working register a long integer or 4 bytes but it could 
be two in some cases
data is an long array containing the dictionary/code

Faster would be using >> to shift the value 2 places instead of divide 
since it's a power of two.
Even faster would be to use a different variable that is the offset in 
long words so no math is required at all.

-- 
Cecil - k5nwa

Thread

esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-01 15:18 -0600
  Re: esp8266 eForth and it's development software David Schultz <abuse@127.0.0.1> - 2017-03-01 15:29 -0600
    Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-01 17:16 -0600
      Re: esp8266 eForth and it's development software David Schultz <abuse@127.0.0.1> - 2017-03-01 17:51 -0600
        Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-01 18:36 -0600
          Re: esp8266 eForth and it's development software Paul Rubin <no.email@nospam.invalid> - 2017-03-01 16:53 -0800
            Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-01 19:28 -0600
              Re: esp8266 eForth and it's development software Paul Rubin <no.email@nospam.invalid> - 2017-03-01 17:56 -0800
                Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-01 20:53 -0600
                Re: esp8266 eForth and it's development software Paul Rubin <no.email@nospam.invalid> - 2017-03-01 18:57 -0800
                Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-01 21:17 -0600
                Re: esp8266 eForth and it's development software David Schultz <abuse@127.0.0.1> - 2017-03-01 21:38 -0600
                Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-01 22:02 -0600
                Re: esp8266 eForth and it's development software Paul Rubin <no.email@nospam.invalid> - 2017-03-01 19:40 -0800
                Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-01 22:44 -0600
  Re: esp8266 eForth and it's development software Paul Rubin <no.email@nospam.invalid> - 2017-03-01 14:50 -0800
    Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-01 17:26 -0600
      Re: esp8266 eForth and it's development software Paul Rubin <no.email@nospam.invalid> - 2017-03-01 15:41 -0800
      Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-01 18:10 -0600
  Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-04 20:50 -0600
    Re: esp8266 eForth and it's development software Paul Rubin <no.email@nospam.invalid> - 2017-03-04 20:10 -0800
      Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-04 23:06 -0600
        Re: esp8266 eForth and it's development software Paul Rubin <no.email@nospam.invalid> - 2017-03-04 21:25 -0800
          Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-05 00:47 -0600
            Re: esp8266 eForth and it's development software Paul Rubin <no.email@nospam.invalid> - 2017-03-05 01:36 -0800
              Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-05 17:11 -0600
              Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-05 15:43 -0600
            Re: esp8266 eForth and it's development software Mark Wills <markwills1970@gmail.com> - 2017-03-06 01:45 -0800
              Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-06 10:44 -0600
              Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-06 12:28 -0600
                Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-06 16:00 -0600
                Re: esp8266 eForth and it's development software Rod Pemberton <NeedNotReplyHere@xrsevnneqk.cem> - 2017-03-06 17:57 -0500
                Re: esp8266 eForth and it's development software Mark Wills <markwills1970@gmail.com> - 2017-03-07 01:23 -0800
                Re: esp8266 eForth and it's development software albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-03-07 12:32 +0100
                Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-07 10:39 -0600
  Re: esp8266 eForth and it's development software albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-03-06 13:35 +0100
    Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-06 10:51 -0600
      Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-07 22:33 -0600
        Re: esp8266 eForth and it's development software Paul Rubin <no.email@nospam.invalid> - 2017-03-07 20:39 -0800
          Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-07 23:42 -0600
            Re: esp8266 eForth and it's development software Paul Rubin <no.email@nospam.invalid> - 2017-03-07 23:44 -0800
              Re: esp8266 eForth and it's development software Cecil Bayona <cbayona@cbayona.com> - 2017-03-08 11:03 -0600
          Re: esp8266 eForth and it's development software albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-03-08 12:05 +0100
    Re: esp8266 eForth and it's development software anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-03-06 17:09 +0000
      Re: esp8266 eForth and it's development software albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-03-07 12:52 +0100

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