[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 #76 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #74)
> (In reply to Jacob Lifshay from comment #72)
> 
> > that's GF(p) FFT.
> 
> sigh that is the correct one used for Reed Solomon and ECC25519

Reed Solomon uses either carry-less or GF(2^n) iirc.

ECC uses either GF(2^n) or GF(p) (depending on the variety of ECC), except that
the word size is usually > 64-bits, so we may need to use carry-less or big
integer operations there.

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