[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 #79 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #78)
> gfbmadd RT, RA, RB, RC
> (RT) = gfbadd(gfbmul((RA), (RB)), (RC))
> 
> jacob you modified the ordering and naming
> of the registers.

well, what I put exactly matches maddld:
maddld RT,RA.RB,RC
prod0:127 ← (RA) × (RB)
sum0:127 ← prod + EXTS(RC)
RT ← sum64:127

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