[Libre-soc-isa] [Bug 962] design integer-versions of fft/dct "butterfly" instructions

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=962

--- Comment #2 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Konstantinos Margaritis (markos) from comment #1)
> First working prototype/design here:
> 
> https://libre-soc.org/openpower/sv/twin_butterfly/

awesome.  comments:

    * maddsubrs RT,RA,SH,RB

normally (by convention) RB is in the 3rd operand position.

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