[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 #59 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
as if grevlut was not fun enough already i figured a 3-in register variant
would allow multiple left-right 4+4 LUTs in RC, one for each row
in the swapping-lookup-crossover-mixing-thing.

i can't explain why, it just felt right, to have the means to
flip individual rows, i think this will turn out to be a really
powerful instruction.

i did however just realise that the sh parameter is totally redundant
because if you can provide individual LUTs per row then it is a straightforward
matter to set an 8-bit setting within RC for that row which does absolutely
nothing.  hilariously a grevluti might help with setting up RC with the
appropriate bits, hmm.  some of them.

thoughts appreciated.

-- 
You are receiving this mail because:
You are on the CC list for the bug.