[PATCH] X86: tidy up MOV64ri64i32

[Tim Northover]

Hi,

This patch changes MOV64ri64i32 into something I've called MOV32ri64 to avoid the horrible MCInst lowering sub-register hackery. I've also taken the opportunity to implement one of the FIXMEs, combining label generation into a single selection pattern for this instruction.

The main thing I'm unsure of is whether I should have created it as a more detailed pseudo-instruction, with itineraries and so on to improve scheduling.

Does it look OK?

Cheers.

Tim.
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