[Symmetry]

Huh, I'd heard that the Bitmanip extension would have a conditional move but I don't see it in this version.

[brucehoult]

That, and other operations requiring three input registers -- therefore a LOT of encoding space -- has been postponed to a possible future extension.

Full GREV and my lovely GORC have also gotten lost, though the encodings for the specific REV and ORC instructions that are included are upwardly compatible with the proposed general versions.