If I am right every C-compiler uses optimizer from gcc (Llinux). PIC 18x
has implemented addressable stack but C18 compilek doesn't use it at
all. I can't agree to do a really good optimizer is not very hard work
but it should be done producing compiler for a group of micros.
BTW Keil compiler for 51 uses registers anytime where it's possible but
there is a memory part too because ... one never knows....
Regards

Igor

> Any compiler ought to be smart enough to put all the global variables
> into registers (if they fit.)  (to be fair, it wasn't clear whether
> they meant this mainly for the cases where not all the variables fit
> in registers; using local variables makes it possibles (or at least a
> lot
> easier) to determine when you can reuse a location because it's not
> used anymore...)  Any good compiler ought  to be able to reference
> global memory as offsets to a global heap pointer if the improvement
in
> memory utilization is that significant...  (although I don't know how
> hard that would be, really.)
>
> BillW

Exactly! And with regard to how difficult it would be, answer: not very
hard.

Regards
Sergio Masci

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