[Libre-soc-isa] [Bug 1074] create twin-butterfly research page into DCT/FFT instructions

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1074

Jacob Lifshay <programmerjake at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |programmerjake at gmail.com

--- Comment #3 from Jacob Lifshay <programmerjake at gmail.com> ---
current pseudocode is 5-in 2-out, since that's too much, i have an idea that
might work for how to reduce that:
https://libre-soc.org/irclog/%23libre-soc.2023-04-27.log.html#t2023-04-27T20:06:41
> idea: put the pair of coefficients and accumulated sums each in 1 reg with each value being the lower/upper half of a reg...this should reduce input/output regs to 4-in 1-out
> idk if that'll fit the DCT pattern tho
> this is kinda like how cdtbcd works where the upper and lower halves are independent
> e.g. RT <- ((RT)[0:XLEN/2-1] + prod0) || ((RT)[XLEN/2:XLEN-1] + prod1)
> that way if you set elwid=32 you get 2 16-bit results

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