[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 #80 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #79)

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

drat, drat.  and i based the GF twin ops on
FP ones... damnit that's going to have ramifications
for SV REMAP (madd* is not implemented yet)
last thing i want to dig into right now.

not sure what's best to do here.  the twin ops
can be left for later, as long as the opcode space
is allocated.

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