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| PR1ME C compiler sources derek@_NOSPAM_knosof.co.uk (Derek M. Jones) (2019-09-25) |
| Re: PR1ME C compiler sources arnold@skeeve.com (2019-09-25) |
| Re: PR1ME C compiler sources drb@ihatespam.msu.edu (2019-09-25) |
| Re: PR1ME C compiler sources drb@ihatespam.msu.edu (2019-09-25) |
| Re: PR1ME C compiler sources derek@_NOSPAM_knosof.co.uk (Derek M. Jones) (2019-09-26) |
| Re: PR1ME C compiler sources gneuner2@comcast.net (George Neuner) (2019-09-27) |
| Re: C compiler pointer management on DSPs derek@_NOSPAM_knosof.co.uk (Derek M. Jones) (2019-09-28) |
| Re: C compiler pointer management on DSPs david.brown@hesbynett.no (David Brown) (2019-09-29) |
| Re: C compiler pointer management on DSPs 847-115-0292@kylheku.com (Kaz Kylheku) (2019-09-30) |
| Re: C compiler pointer management on DSPs gneuner2@comcast.net (George Neuner) (2019-10-03) |
| Re: C compiler pointer management on DSPs gah4@u.washington.edu (2020-02-27) |
| Re: C compiler pointer management on DSPs robin51@dodo.com.au (2020-02-28) |
| Re: C compiler pointer management on DSPs gah4@u.washington.edu (2020-02-28) |
| From: | David Brown <david.brown@hesbynett.no> |
| Newsgroups: | comp.compilers |
| Date: | Sun, 29 Sep 2019 10:53:35 +0200 |
| Organization: | A noiseless patient Spider |
| References: | 19-09-003 19-09-004 19-09-006 19-09-007 19-09-009 19-09-015 19-09-017 |
| Injection-Info: | gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970"; logging-data="96365"; mail-complaints-to="abuse@iecc.com" |
| Keywords: | DSP, architecture, C |
| Posted-Date: | 30 Sep 2019 18:06:34 EDT |
| Content-Language: | en-GB |
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.)
Some processors have larger access sizes to simplify the hardware. The
first DEC Alpha, and some ARM designs, had no instructions for reading
or writing 8-bit or 16-bit data. In effect, these had 32-bit (maybe on
the Alpha it was 64-bit) "byte" sizes. But smaller access sizes could
be easily simulated in software.
I can't think of any application where 48-bit would such a natural fit
that you'd have it as your basic access unit. Some video DSP's have
used 48-bit units, but that is for a vector of 3 16-bit colour units.
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