[Libre-soc-bugs] [Bug 782] add galois field bitmanip instructions

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=782

--- Comment #75 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
https://github.com/fast-crypto-lab/Frobenius_AFFT

that's totally opaque to me until i realised, it
is FFT with mul-add as modulo-mul and XOR.

then i also remembered that it is DCT that has the
mul-with-add-and-sub (which is meaningless for GF2
because add and sub are the same)

whereas FFT is:

  RT = MUL(RA, RC) + RB
  RS = RA - RB

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