Re: [f-cpu] new manual version

[Yann Guidon <whygee@f-cpu.org>]

hi !

Michael Riepe wrote:
> 
> On Mon, Feb 18, 2002 at 09:50:50AM -0700, Ben Franchuk wrote:
> [...]
> > Would modified INC/DEC unit be useful for +2,4,8 -2,4,8 constants
> > and another INC/DEC instruction. I am thinking of a language like
> > FORTH where they pop and push stuff on a stack like mad and use
> > of the general adder could be a bottle neck on this kind of address
> > calculation.
> We still have the option to do that with the original instruction
> (there are some free bits because the instruction is 1r1w).
> And we don't need a separate unit either, we just have to leave the
> least significant bits alone.

you're right but, on the wider perspective, it is about memory addressing,
so post-incremented pointers are the rule in that case.

>  Michael "Tired" Riepe <Michael.Riepe@stud.uni-hannover.de>
WHYGEE
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