Re: [f-cpu] New EU_SHL Instruction

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

hi !

Thilo Reichelt wrote:

> At 01:59 09.01.03 +0100, you wrote:
>
> > hi !
> >
> > i don't remember the discussion about this, but there was some kind 
> > of inherent
> > limitation related to the index size ...
> > If we set that the size of the index equals the size of the chunk, 
> > that should be ok.
>
> I faintly remember this discussion. Probably from 2000 or earlier. 
> When the f-cpu list was still at yahoo!
> <searching ... ... ... >
>
> This discussion was in may 2000 .
> And, as Michael Riepe has already said, if the smallest chunk size is 
> 8 bits, this instruction is only useful up to 2048 bit wide registers
>
> Hmm, reading the old posts is a little bit confusing...
> Ok, the discussion jumped around between what Michael Riepe called 
> permute now and another instruction, which would shuffle around chunks 
> from TWO different source registers and stuff them in a destination 
> register (a 3r1w instruction)
Thanks for this search :-)

i don't remember about the 3R1W instruction.


> Thilo Reichelt
YG

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