At 12:59 PM 7/5/01 -0700, you wrote:
> Don,
>
> I disagree with you about the Orthogonality of the PIC's.  That's
> one of it's claims to fame.  Or at least so I was told, and from
> what I've experienced.   Now, how that relates to writing a C
> compiler for them, I haven't a clue.  But from a programmers point
> of view, all instructions operate on all registers the same way as
> far as I can tell.  Correct me if I'm wrong, but I just disagree
> with this point.

RAM and code banking is one big deviation from orthogonality. The
12-bit processors are particularly unpleasant from this perspective.
If you can't easily generate relocatable code, a decent compiler gets
much more difficult. In some cases, the compiler vendors just gave
up. I think Hitech C, for example, does not support arrays larger
than 256 elements on the 12-bit processors.

Best regards,

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Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
Contributions invited->The AVR-gcc FAQ is at: http://www.bluecollarlinux.com
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