Re: C compiler pointer management on DSPs

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From	Kaz Kylheku <847-115-0292@kylheku.com>
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Subject	Re: C compiler pointer management on DSPs
Date	Mon, 30 Sep 2019 23:50:30 +0000 (UTC)
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On 2019-09-29, David Brown <david.brown@hesbynett.no> wrote:
> On 28/09/2019 20:19, Derek M. Jones wrote:
>> George,
>>
>>> Just curious - what DSPs have 48-bit characters?
>>
>> Motorola DSP56000 Family Optimizing C Compiler uses 24 bits
>> TMS320C3x/C4x Optimizing C Compiler uses 32 bits
>>
>> I remember reading a compiler manual and thinking, wow, that's
>> unusual.
>
> 24-bit DSP's have been popular for audio applications.  (There is also
> the TPU, a specialised RISC processor used for timer applications in
> engine control microcontrollers, that is 24-bit.)

Zilog produced a somewhat odd upgrade to the Z80 called eZ80.

(Not related to the incompatible Z8000 from 1979).

No idea in what exact year this was introduced, but it's actually seeing
some commercial success, unlike other Z80 upgrade attempts. Such as,
it's used in TI-84 graphing calculators.

https://en.wikipedia.org/wiki/Zilog_eZ80

This operates in a Z80 compatible mode or a mode called "ADL" in which
registers are 24 bits wide, and there is a 16M flat address space.

Someone made a board for this that runs a Lisp dialect called Maker Lisp
see <https://makerlisp.com/> and more recently CP/M.

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Thread

PR1ME C compiler sources "Derek M. Jones" <derek@_NOSPAM_knosof.co.uk> - 2019-09-25 15:27 +0100
  Re: PR1ME C compiler sources arnold@skeeve.com (Aharon Robbins) - 2019-09-25 18:32 +0000
    Re: PR1ME C compiler sources drb@ihatespam.msu.edu (Dennis Boone) - 2019-09-25 20:02 -0500
      Re: PR1ME C compiler sources arnold@skeeve.com (Aharon Robbins) - 2019-09-26 10:57 +0000
    Re: PR1ME C compiler sources drb@ihatespam.msu.edu (Dennis Boone) - 2019-09-25 20:04 -0500
      Re: PR1ME C compiler sources drb@ihatespam.msu.edu (Dennis Boone) - 2019-09-25 20:28 -0500
        Re: PR1ME C compiler sources "Derek M. Jones" <derek@_NOSPAM_knosof.co.uk> - 2019-09-26 11:53 +0100
          Re: PR1ME C compiler sources drb@ihatespam.msu.edu (Dennis Boone) - 2019-09-27 10:19 -0500
            Re: PR1ME C compiler sources "Derek M. Jones" <derek@_NOSPAM_knosof.co.uk> - 2019-09-28 00:48 +0100
              Re: PR1ME C compiler pointer management drb@ihatespam.msu.edu (Dennis Boone) - 2019-09-28 11:08 -0500
                Re: PR1ME C compiler sources and pointer formats Christopher F Clark <christopher.f.clark@compiler-resources.com> - 2019-09-29 07:48 -0400
                Re: PR1ME C compiler sources and pointer formats drb@ihatespam.msu.edu (Dennis Boone) - 2019-09-30 22:10 -0500
          Re: PR1ME C compiler sources George Neuner <gneuner2@comcast.net> - 2019-09-27 20:56 -0400
            Re: C compiler pointer management on DSPs "Derek M. Jones" <derek@_NOSPAM_knosof.co.uk> - 2019-09-28 19:19 +0100
              Re: C compiler pointer management on DSPs David Brown <david.brown@hesbynett.no> - 2019-09-29 10:53 +0200
                Re: C compiler pointer management on DSPs Kaz Kylheku <847-115-0292@kylheku.com> - 2019-09-30 23:50 +0000
                Re: C compiler pointer management on DSPs George Neuner <gneuner2@comcast.net> - 2019-10-03 01:34 -0400
                Re: C compiler pointer management on DSPs gah4@u.washington.edu - 2020-02-27 14:23 -0800
                Re: C compiler pointer management on DSPs robin51@dodo.com.au - 2020-02-28 10:26 +1100
                Re: C compiler pointer management on DSPs gah4@u.washington.edu - 2020-02-28 02:33 -0800

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