[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 #9 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Luke Kenneth Casson Leighton from comment #8)
> https://git.libre-soc.org/?p=libreriscv.git;a=commitdiff;
> h=9094d03d96dc474267c587fc94b8b5fdc8244227
> 
> 
> +    res1 <- ROTL64(prod1, XLEN-SH)
> +    res2 <- ROTL64(prod2, XLEN-SH)
> 
> ha, excellent.

oh hang on, no, that doesn't quite do it, the MSBs still get
rotated into LSB positions.  or err the the other way round.

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