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by sgentle 4277 days ago
Here's my attempt using the "ring of xor" technique posted elsewhere: https://imgur.com/xGHmN9c

It follows the hex structure of the other gates (inputs down and diagonally up, outputs up and diagonally down). It's got a radius 4 (the 5th blocks being the example inputs and outputs) but I think you could probably do better with some judicious bit trickery in the middle.

Edit: Radius 3: https://i.imgur.com/BaI6YLj - I wonder if 2 is possible?