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.

                                            Regards,

                                              Jim




On Thu, 05 July 2001, Don Hyde wrote:

>
> Well, the compiler guys just don't want to mess with it.  The PIC's is about
> as un-orthogonal (and compiler-unfriendly) as you can get, but there are
> several compilers for them, and some of them are pretty good.
>
> Orthogonality in an instruction set means that it has a bunch of registers
> that are alike, with instructions that all work the same on all the
> registers.  Very few actual processors are completely orthogonal, and some
> of the most common (such as Intel's and PIC's and RISC machines) are very
> far from that ideal of convenience for compiler writers.
>
> > -----Original Message-----
> > From: Simon-Thijs de Feber [mailto:stdf23173@YAHOO.CO.UK]
> > Sent: Thursday, July 05, 2001 2:42 PM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: [OT]: Making of a C compiler
> >
> >
> > Hello all,
> >
> > No this is not the next proposal for a C-compiler.
> > I was just wondering how the compiler is made.
> >
> > teh company i work for has a processor of which they
> > cannot make a c compiler just because it has no
> > Orthogonal Instruction Set.
> >
> > This does not mean anything to me !!
> >
> > Please can some one elaborate ???
> >
> >
> > grtz,
> >
> >
> > Simon
> >
> >
> > ____________________________________________________________
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> >
> >
>
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jim@jpes.com

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