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

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Thu Jan 6 02:56:21 GMT 2022


--- Comment #19 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #18)
> the question is, then: is it worth it?  for the sheer awesome flexibility
> it has - the number of options that can be covered - i'd say hell yes,
> if it wasn't for the fact that it's 65 *thousand* gates - four times
> larger than a 64-bit multiplier and three times larger than an IEEE754 FP
> multiply.

I think that's an interesting idea, however I think that should be left for
next time -- We're kinda out-of-time and I just want to be done with the
bitmanip instructions...I'm going to work on the rest of the bitmanip
instructions in approximately the order I think they will be most useful to
least useful, hence why I started on ternlog and grev. If/when we run out of
time, that way we will have the most useful ones all finished -- and the more
questionable/incompletely-designed instructions left for last.

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