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Re: Stack Sizes

From rickman <gnuarm@gmail.com>
Newsgroups comp.lang.forth
Subject Re: Stack Sizes
Date 2016-10-05 20:01 -0400
Organization A noiseless patient Spider
Message-ID <nt448q$eig$1@dont-email.me> (permalink)
References (2 earlier) <57f3f915$0$875$e4fe514c@news.xs4all.nl> <nt10k9$61u$1@gioia.aioe.org> <b21bd81e-a189-4abd-a931-197e3653caa7@googlegroups.com> <nt3om1$8rj$1@dont-email.me> <60e003f5-ea51-42d2-a1cc-0479c25e2870@googlegroups.com>

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On 10/5/2016 7:32 PM, hughaguilar96@gmail.com wrote:
> On Wednesday, October 5, 2016 at 1:44:00 PM UTC-7, Cecil - k5nwa
> wrote:
>> Interesting, on and off I have worked on a project using a funky
>> virtual machine but somewhat different from your idea.
>>
>> The Forth compiler generates an internal form, basically
>> micro-primitives, it takes several micro-primitives do do simple
>> operations such a DUP, SWAP, + etc. many of those micro-primitives
>>  translate to a single instruction on a decent CPU.
>>
>> Here is where I take a turn in a different direction, before the
>> assembler generates the code for the CPU an optimizer steps in and
>> looks for patterns of micro-primitives, if a match is found then a
>> simpler pattern replaces the old pattern, these substitutions are
>> directed by a template file that specifies how to optimize the
>> code. After the optimizer is finished the code is handed over to
>> the assembler that generates actual machine code for a specific
>> CPU.
>
> That doesn't diverge very much from my design.
>
> I was thinking of having multiple versions of each instruction, each
> with a different configuration in regard to how many of the top stack
> items (0, 1 or 2) are expected in registers and how many (0, 1 or 2)
> are returned in registers.

That would need to be supported by the CPU directly, no?  In essence the 
CPU would have to know how many stack items are in registers and call 
the appropriate microcode to execute the appropriate primitive. 
Otherwise how would the compiler know what to expect when a word is 
compiled into another word?

Given that any word can be called my a number of other words, how can a 
compiler know what is happening at run time?

I'm not entirely clear on the context of this use of stack caching. 
Normally this is a technique used to facilitate the use of multiple 
registers in a standard CPU.  The trick is to know when to adjust the 
stack item count in registers and when such an adjustment would be 
counter productive.  It would not be unreasonable to keep in registers 
more items than typically needed by any one word and only adjust when 
required.  So hysteresis could facilitate this.  If a stack push is 
needed when the register count is already at max does a flush of n 
items.  A stack pop when the register usage count is at the minimum does 
a cache fill.  But how can a standard CPU know when to do this?  Either 
the CPU needs to have hardware support for this, which standard CPUs 
don't have, or extra instructions are required for every stack operation 
to check the register usage count.

Am I missing something?  If stack caching doesn't always keep the same 
number of items in registers, how can a standard CPU keep track of when 
to fill and flush?

-- 

Rick C

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Thread

Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-03 08:22 -0400
  Re: Stack Sizes foxaudioresearch@gmail.com - 2016-10-03 07:00 -0700
    Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-03 11:14 -0400
      Re: Stack Sizes Bernd Linsel <bl1@gmx.com> - 2016-10-03 18:20 +0200
        Re: Stack Sizes Cecil Bayona <cbayona@cbayona.com> - 2016-10-03 11:30 -0500
          Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-03 15:27 -0400
          Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-03 18:12 -0400
            Re: Stack Sizes Cecil Bayona <cbayona@cbayona.com> - 2016-10-03 17:52 -0500
            Re: Stack Sizes Paul Rubin <no.email@nospam.invalid> - 2016-10-03 16:06 -0700
        Re: Stack Sizes Jan Coombs <jenfhaomndgfwutc@murmic.plus.com> - 2016-10-04 08:31 +0100
          Re: Stack Sizes anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-10-04 08:46 +0000
            Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-04 10:38 -0400
            Re: Stack Sizes hughaguilar96@gmail.com - 2016-10-04 11:59 -0700
              Re: Stack Sizes anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-10-05 09:59 +0000
                Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-05 10:16 -0400
                Re: Stack Sizes anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-10-06 08:21 +0000
          Re: Stack Sizes minforth@arcor.de - 2016-10-04 05:00 -0700
          Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-04 08:49 -0400
      Re: Stack Sizes Paul Rubin <no.email@nospam.invalid> - 2016-10-03 16:28 -0700
        Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-04 10:36 -0400
          Re: Stack Sizes Rod Pemberton <NoHaveNotOne@zxdehrnyya.cam> - 2016-10-04 16:15 -0400
          Re: Stack Sizes Brad Eckert <hwfwguy@gmail.com> - 2016-11-09 09:56 -0800
            Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-11-12 09:15 -0500
    Re: Stack Sizes Cecil Bayona <cbayona@cbayona.com> - 2016-10-03 10:35 -0500
    Re: Stack Sizes Bernd Paysan <bernd@net2o.de> - 2016-10-11 01:01 +0000
  Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-03 10:21 -0400
    Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-03 11:06 -0400
      Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-03 15:22 -0400
        Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-03 18:04 -0400
    Re: Stack Sizes Hans Bezemer <the.beez.speaks@gmail.com> - 2016-10-04 20:46 +0200
      Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-04 15:40 -0400
        Re: Stack Sizes hughaguilar96@gmail.com - 2016-10-05 12:26 -0700
          Re: Stack Sizes Cecil Bayona <cbayona@cbayona.com> - 2016-10-05 15:44 -0500
            Re: Stack Sizes hughaguilar96@gmail.com - 2016-10-05 16:32 -0700
              Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-05 20:01 -0400
                Re: Stack Sizes anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-10-07 07:39 +0000
              Re: Stack Sizes Cecil Bayona <cbayona@cbayona.com> - 2016-10-05 20:36 -0500
                Re: Stack Sizes hughaguilar96@gmail.com - 2016-10-05 21:28 -0700
          Re: Stack Sizes alex <alex@rivadpm.com> - 2016-10-05 22:07 +0100
            Re: Stack Sizes hughaguilar96@gmail.com - 2016-10-06 00:05 -0700
            Re: Stack Sizes Andrew Haley <andrew29@littlepinkcloud.invalid> - 2016-10-06 02:17 -0500
      Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-04 19:27 -0400
        Re: Stack Sizes Hans Bezemer <the.beez.speaks@gmail.com> - 2016-10-05 18:58 +0200
          Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-05 13:17 -0400
            Re: Stack Sizes Hans Bezemer <the.beez.speaks@gmail.com> - 2016-10-22 12:35 +0200
          Re: Stack Sizes Cecil Bayona <cbayona@cbayona.com> - 2016-10-05 12:18 -0500
            Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-05 16:07 -0400
              Re: Stack Sizes Cecil Bayona <cbayona@cbayona.com> - 2016-10-05 15:50 -0500
                Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-05 17:36 -0400
                Re: Stack Sizes Cecil Bayona <cbayona@cbayona.com> - 2016-10-05 17:14 -0500
                Re: Stack Sizes "Elizabeth D. Rather" <erather@forth.com> - 2016-10-05 14:48 -1000
                Re: Stack Sizes Cecil Bayona <cbayona@cbayona.com> - 2016-10-05 20:49 -0500
  Re: Stack Sizes anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-10-03 16:32 +0000
  Re: Stack Sizes Chris Curl <ccurl609@gmail.com> - 2016-10-03 13:53 -0700
    Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-03 17:54 -0400
  Re: Stack Sizes Rod Pemberton <NoHaveNotOne@zxdehrnyya.cam> - 2016-10-03 23:40 -0400
    Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-04 11:30 -0400
  Re: Stack Sizes hughaguilar96@gmail.com - 2016-10-03 21:47 -0700
    Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-04 11:22 -0400
      Re: Stack Sizes hughaguilar96@gmail.com - 2016-10-04 11:44 -0700
        Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-04 15:53 -0400
          Re: Stack Sizes Rod Pemberton <NoHaveNotOne@zxdehrnyya.cam> - 2016-10-04 16:15 -0400
      Re: Stack Sizes hughaguilar96@gmail.com - 2016-10-05 14:31 -0700
        Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-06 08:48 -0400
          Re: Stack Sizes Paul Rubin <no.email@nospam.invalid> - 2016-10-06 13:08 -0700
            Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-06 19:11 -0400
  Re: Stack Sizes jim.brakefield@ieee.org - 2016-10-06 12:08 -0700
    Re: Stack Sizes alex <alex@rivadpm.com> - 2016-10-06 21:47 +0100
    Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-06 19:05 -0400
    Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-06 21:57 -0400
      Re: Stack Sizes jim.brakefield@ieee.org - 2016-10-06 19:21 -0700
        Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-07 00:10 -0400
          Re: Stack Sizes Paul Rubin <no.email@nospam.invalid> - 2016-10-06 23:14 -0700
            Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-07 02:26 -0400
              Re: Stack Sizes Paul Rubin <no.email@nospam.invalid> - 2016-10-06 23:57 -0700
                Re: Stack Sizes Andrew Haley <andrew29@littlepinkcloud.invalid> - 2016-10-07 08:18 -0500
                Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-07 10:52 -0400
                Re: Stack Sizes hughaguilar96@gmail.com - 2016-10-09 16:22 -0700
                Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-10 01:49 -0400
                Re: Stack Sizes Cecil Bayona <cbayona@cbayona.com> - 2016-10-10 10:21 -0500
                Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-10 22:39 -0400
                Straight Forth Re: Stack Sizes albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2016-10-10 12:36 +0200
                Re: Straight Forth Re: Stack Sizes hughaguilar96@gmail.com - 2016-10-13 13:45 -0700
                Re: Straight Forth Re: Stack Sizes hughaguilar96@gmail.com - 2016-10-14 01:16 -0700
                Re: Straight Forth Re: Stack Sizes hughaguilar96@gmail.com - 2016-10-15 20:38 -0700
                Re: Straight Forth Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-16 02:00 -0400
                Re: Straight Forth Re: Stack Sizes lawrencedo99@gmail.com - 2016-10-16 18:38 -0700
                Re: Straight Forth Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-16 22:27 -0400
                Re: Straight Forth Re: Stack Sizes Raimond Dragomir <raimond.dragomir@gmail.com> - 2016-10-16 21:14 -0700
                Re: Straight Forth Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-17 00:35 -0400
                Re: Straight Forth Re: Stack Sizes Raimond Dragomir <raimond.dragomir@gmail.com> - 2016-10-16 23:31 -0700
                Re: Straight Forth Re: Stack Sizes "Elizabeth D. Rather" <erather@forth.com> - 2016-10-16 20:36 -1000
                Re: Straight Forth Re: Stack Sizes hughaguilar96@gmail.com - 2016-10-17 13:11 -0700
                Re: Straight Forth Re: Stack Sizes Rod Pemberton <NeedNotReplyHere@xrsevnneqk.cem> - 2016-10-17 19:14 -0400
                Re: Straight Forth Re: Stack Sizes Bernd Paysan <bernd@net2o.de> - 2016-10-17 21:53 +0000
                Re: Straight Forth Re: Stack Sizes lawrencedo99@gmail.com - 2016-10-17 16:54 -0700
                Re: Straight Forth Re: Stack Sizes Bernd Paysan <bernd@net2o.de> - 2016-10-21 22:13 +0000
                Re: Straight Forth Re: Stack Sizes lawrencedo99@gmail.com - 2016-10-21 17:46 -0700
                Re: Straight Forth Re: Stack Sizes Bernd Paysan <bernd@net2o.de> - 2016-10-23 22:26 +0000
                Re: Straight Forth Re: Stack Sizes JUERGEN <epldfpga@aol.com> - 2016-10-24 09:13 -0700
                Re: Straight Forth Re: Stack Sizes lawrencedo99@gmail.com - 2016-10-24 16:28 -0700
                Re: Straight Forth Re: Stack Sizes Paul Rubin <no.email@nospam.invalid> - 2016-10-24 17:20 -0700
                Re: Straight Forth Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-24 22:23 -0400
                Re: Straight Forth Re: Stack Sizes Bernd Paysan <bernd@net2o.de> - 2016-11-04 20:39 +0000
                Re: Straight Forth Re: Stack Sizes lawrencedo99@gmail.com - 2016-10-16 22:42 -0700
                Re: Straight Forth Re: Stack Sizes albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2016-10-17 11:12 +0200
                Re: Straight Forth Re: Stack Sizes Paul Rubin <no.email@nospam.invalid> - 2016-10-17 09:20 -0700
                Re: Straight Forth Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-17 19:11 -0400
                Re: Straight Forth Re: Stack Sizes Paul Rubin <no.email@nospam.invalid> - 2016-10-17 16:40 -0700
                Re: Straight Forth Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-17 20:19 -0400
                Re: Straight Forth Re: Stack Sizes Paul Rubin <no.email@nospam.invalid> - 2016-10-17 17:25 -0700
                Re: Straight Forth Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-17 20:50 -0400
                Re: Straight Forth Re: Stack Sizes albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2016-10-18 02:04 +0200
                Re: Straight Forth Re: Stack Sizes anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-10-18 06:13 +0000
                Re: Straight Forth Re: Stack Sizes hughaguilar96@gmail.com - 2016-10-16 15:21 -0700
                Re: Straight Forth Re: Stack Sizes Doug Hoffman <glidedog@gmail.com> - 2016-10-17 04:09 -0400
                Re: Straight Forth Re: Stack Sizes hughaguilar96@gmail.com - 2016-10-17 13:48 -0700
                Re: Straight Forth Re: Stack Sizes albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2016-10-18 02:12 +0200
                Re: Straight Forth Re: Stack Sizes hughaguilar96@gmail.com - 2016-10-18 00:35 -0700
                Re: Straight Forth Re: Stack Sizes albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2016-10-18 12:53 +0200
                Re: Straight Forth Re: Stack Sizes hughaguilar96@gmail.com - 2016-10-18 12:12 -0700
                Re: Stack Sizes anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-10-07 16:53 +0000
                Re: Stack Sizes Andrew Haley <andrew29@littlepinkcloud.invalid> - 2016-10-09 08:34 -0500
                Re: Stack Sizes anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-10-09 16:03 +0000
                Re: Stack Sizes Andrew Haley <andrew29@littlepinkcloud.invalid> - 2016-10-10 03:25 -0500
                Re: Stack Sizes Cecil Bayona <cbayona@cbayona.com> - 2016-10-10 10:29 -0500
                Re: Stack Sizes Andrew Haley <andrew29@littlepinkcloud.invalid> - 2016-10-11 05:19 -0500
                Re: Stack Sizes anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-10-10 14:41 +0000
                Re: Stack Sizes Lars Brinkhoff <lars.spam@nocrew.org> - 2016-10-10 20:23 +0200
                Re: Stack Sizes Andrew Haley <andrew29@littlepinkcloud.invalid> - 2016-10-11 05:16 -0500
                Re: Stack Sizes anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-10-12 12:54 +0000
                Re: Stack Sizes albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2016-10-12 18:27 +0200
                Re: Stack Sizes anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-10-12 17:06 +0000
                Re: Stack Sizes Andrew Haley <andrew29@littlepinkcloud.invalid> - 2016-10-12 13:01 -0500
                Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-12 17:07 -0400
                Re: Stack Sizes albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2016-10-13 03:18 +0200
                Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-14 14:26 -0400
                Re: Stack Sizes lawrencedo99@gmail.com - 2016-10-12 20:30 -0700
                Re: Stack Sizes anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-10-13 15:52 +0000
                Re: Stack Sizes lawrencedo99@gmail.com - 2016-10-13 15:05 -0700
                Re: Stack Sizes Andrew Haley <andrew29@littlepinkcloud.invalid> - 2016-10-14 03:08 -0500
                Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-14 14:41 -0400
                Re: Stack Sizes Cecil Bayona <cbayona@cbayona.com> - 2016-10-07 12:33 -0500
                Re: Stack Sizes rickman <gnuarm@gmail.com> - 2016-10-08 01:12 -0400
              Re: Stack Sizes Rod Pemberton <NeedNotReplyHere@xrsevnneqk.cem> - 2016-10-07 23:05 -0400
                Re: Stack Sizes jim.brakefield@ieee.org - 2016-10-07 21:56 -0700
                Re: Stack Sizes Walter Banks <walter@bytecraft.com> - 2016-10-08 07:23 -0400
                Re: Stack Sizes lawrencedo99@gmail.com - 2016-10-11 22:39 -0700
            Re: Stack Sizes Lars Brinkhoff <lars.spam@nocrew.org> - 2016-10-07 08:21 +0200
            Re: Stack Sizes albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2016-10-07 09:22 +0200
              Re: Stack Sizes Lars Brinkhoff <lars.spam@nocrew.org> - 2016-10-07 09:35 +0200
                Re: Stack Sizes jim.brakefield@ieee.org - 2016-10-07 10:51 -0700
                Re: Stack Sizes Cecil Bayona <cbayona@cbayona.com> - 2016-10-07 13:21 -0500
                Re: Stack Sizes Lars Brinkhoff <lars.spam@nocrew.org> - 2016-10-07 20:40 +0200
                Re: Stack Sizes albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2016-10-07 20:53 +0200
            Re: Stack Sizes anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-10-07 07:35 +0000
              Re: Stack Sizes Paul Rubin <no.email@nospam.invalid> - 2016-10-07 01:09 -0700
                Re: Stack Sizes anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-10-07 15:59 +0000
                Re: Stack Sizes Bernd Paysan <bernd@net2o.de> - 2016-10-17 22:05 +0000

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