[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

--- Comment #4 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #3)
> current pseudocode is 5-in 2-out, since that's too much, i have an idea that
> might work for how to reduce that:

already sorted. copying the pre-established pattern for ffmadds
it is RA that is used as the input-accumulator.

this is the way twin-butterfly works


RT = RA+RB*RC
RS = RA-RB*RC

where if you look at the unit test and also dig into the DCT
Schedule you find RT=RA and RB=RS.

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