Re: [f-cpu] More Instruction Set Trouble

[Michael Riepe <michael@stud.uni-hannover.de>]

On Tue, Aug 21, 2001 at 12:33:15AM -0400, nicO wrote:
[...]
> > The `address add' idea looks better and better, and it's good for
> > pointer/array/structure accesses, too.
> > 
> 
> Hum i don't like that at all because you schould put an adder just
> before the memory unit. So we just as to make the pipeline longer. One
> of the key point of the FC0, to shorten the pipeline, is to put in
> parrallele the ALU and the load&store unit. If we put it in serial, we
> longer the pipe. So i think, it's much better for that case to use 2
> instructions. Never forget that it's adding an other addressing mode .

I think we have a slight misunderstanding here -- `address add' *is*
a separate instruction.  Like normal full-width add, but with slightly
different semantics (like code/data prefetching).

-- 
 Michael "Tired" Riepe <Michael.Riepe@stud.uni-hannover.de>
 "All I wanna do is have a little fun before I die"
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