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One quick question: What's the difference between a move vop and a move-function?

Rob MacLachlan? replies

Well, that's a fine question. Mostly move VOPs can do things that move-functions can't, such as allocate temporaries. Move functions are more efficient to compile because no IR2 is generated to represent them, and the register allocator assumes that register save/restore can be done with move functions.

I think there may also be an element of historical artifact here, in that move functions were implemented first, and move VOPs added later as a more general mechanism.

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