Different sized data and code pointers

[Thomas Gill <thomas dot gill at csr dot com>]

Hi all.

I'm working on a GCC backend for a small embedded processor. We've got a
 Harvard architecture with 16 bit data addresses and 24 bit code
addresses. How well does GCC support having different sized pointers for
this sort of thing? The macros POINTER_SIZE and Pmode seem to suggest 
that there's one pointer size for everything.

The backend that I've inherited gets most of the way with some really
horrible hacks, but it would be nice if those hacks weren't necessary. 
In any case, the hacks don't cope with casting function pointers to 
integers.

Thanks,
Ned.


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