Re: Re:"Is it dead yet?"

[" " <jshammond at my-Deja dot com>]

On Fri, 28 Jan 2000 21:50:01   Gerald Pfeifer wrote:
>On Thu, 13 Jan 2000,     wrote:
>> Within the last year I used the 1750 files
>> to create a compiler.  The
>> company I work for is building an updated 
>> version of the 1750 and we
>> needed tools for it.
>
> Have you already submitted your changes for
> inclusion into the official
> GCC sources? Respectively, are you planning
> to do so? When?
>

The changes haven't been sent in and I
doubt that they will be.

The short term answer is that we haven't
tested it enough to release it outside the
company.  The company won't export a buggy
release under any circumstances.

The long term answer is more complicated but
I'll explain.  Almost 20 years ago the USAF
created the Instruction Set Achitecture for
the MIL-STD-1750A.  This described to the
hardware manufacturers what the ISA of the
1750A was supposed to be.  Many versions of
this CPU were made but they all conformed to
the standard.  The 1750A files that are with
the GCC releases conform to this standard.
You definately want to keep these files as
they are.

They processor we are developing also conforms
to the standard but adds some features.  These
include 32 bit addr and data busses, rather
than the standard 16 bit widths.  To accomodate
this we had to add instructions which are not
part of the standard.  Our updates should not
be considered replacements for what already
exists, they really describe a new processor
and won't work with any other 1750 in existance.

The only people who might care about our source
files are our customers, who will get them 
with their purchase whether they want them 
or not.  I did not offer to send in these files
because I estimate zero demand for them through
your site, not worth the effort it would take
to add them.

If you still want the files I'd be happy to 
send them in when we release them to our
customers.

Regards,

Jeff


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