[Libre-soc-bugs] [Bug 755] add grev instruction (OP_GREV)

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=755

--- Comment #46 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Luke Kenneth Casson Leighton from comment #45)
> (In reply to Jacob Lifshay from comment #44)
> 
> > opcode 22 is currently used by setvl and friends and iirc you didn't want to
> > move them until you're back in working-on-SV mode, so I picked other opcodes
> > meanwhile.
> 
> there should - unless i made a mistake - be room for setvl in opcode 22.

arse, i made a mistake.
https://libre-soc.org/openpower/sv/bitmanip/

ok (not matching what's in sv/trans/svp64.py but correctable)
NN                                              --11 110        Rc      setvl

not ok because there's not enough space.  or, there might be, i have
to double-check the encoding.
NN      RA      RB      RC              10      --10 110        Rc      rsvd

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