Re: [f-cpu] Omega Network

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

hi !

Michael Riepe wrote:
> Hi y'all!
> 
> To clarify the `reversed omega network' issue: it's just an omega network
> with inputs and outputs swapped (see picture 1).
> 
> You may ask, "what's the difference?"  It's not visible in the picture,
> but there is a one important difference -- if the "forward" omega net is
> used for bit shifting, the control logic for the last stage is minimal
> while that for the first stage is huge.  So I reversed the net, and now
> I have minimal logic in the first stage, and the more hairy decoders at
> the end :)
> 
> Both versions can do the basic operations we need: rotate left/right
> and/or bit reversal (see picture 2).  In contrast to other
> implementations, the omega net also supports the SIMD versions of
> these operations, with almost no overhead.

i have only one thing to say :
 oh yeah :-)

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