[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 #18 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #15)
> (In reply to Jacob Lifshay from comment #13)
> 
> > here x would have to be reduced to something without the top bit set, only
> > after reducing it is it a value you'd actually expect to have as an input.
> > I'm not working out what it'd reduce to at the moment, it's 4:30am here.
> 
> brainmelt :)
> 
> when not 4:30am, is there any reason to support binary? i mean if prime is
> just XOR then pffh.

you got them mixed up. binary gf add is xor. prime gf add is integer addition
followed by subtracting the prime if the sum is too big.

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