[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 #43 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #42)
> I think we should use primary opcode 9 for the new second opcode for
> bitmanip instructions...but only for experimentation since it's marked as
> reserved because stuff used to be there. primary opcode 0 should't be used
> since it's reserved for implementation-dependent use and the `attn` opcode.

the official sandbox is EXT022.  the only reason for moving ternlogi
and grevlogi to a separate opcode is because they're completely nuts
on bit-allocation, and were putting design pressure on the bitmanip space
which is pretty heavily loaded.

ternlogi has to move from EXT05 if grevlogi is to be on EXT09, they're
allocated as a pair.

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