[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 #35 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #34)
> (In reply to Luke Kenneth Casson Leighton from comment #33)
> > fantastic. do you have an indication of the gate count (and LUT4 resources,
> > synth_ecp5)?
> 
> I haven't checked, but I expect the additional resources required to be on
> the order of 500 2-in muxes (384 (6 layers * 64 bits) for the grev itself,
> the rest for misc routing in/out)

pffh, that's not bad at all. should be fine to look at a LUT2-based version
which will give 16 instructions and dozens of immediates in a 32-bit op

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