Re: Green Hiils AdaMULTI 2000 -> Motorola Coldfire

[Tucker Taft <stt@averstar.com>]

Martin Dowie wrote:
> 
> Mark,
> 
> I don't know if the problems are still current, but here is a snippet
> from a conversion report to GH AdaMULTI (but targetted at PPC):
> 
> "The first problem we hit was where the ADA'83 code used types with
> 16 bit representation clauses to access 16 bit off board registers. In
> ADA'83 reading and writing to variables of these types compiled to
> a single access and the code worked fine. In GH ADA'95, however,
> the code was compiled into two byte accesses. This often had the effect
> of generating a bus error as some of the addresses in question cannot
> physically be accessed as 8 bits."
> 
> Some may argue that it was sloppy for the original code not have some
> embedded assembler to do the read/writing anyway, but that's not really
> the point here. I suspect that many projects don't go to this length if an
> "all Ada" version works.

pragma Atomic would presumably solve this problem in Ada 95.


-- 
-Tucker Taft   stt@avercom.net   http://www.averstar.com/~stt/
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