[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 #23 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #22)

> skip zero-extension instructions that could otherwise be needed. I picked
> zero-extension rather than sign-extension because that doesn't require
> copying the sign bit, potentially saving wiring.

sensible.  signed concept is only meaningful on arithmetic, this is
a Logical op.  none of the Logical ops do arithmetic.

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