[PATCH] D96015: [RegAllocFast] Handle case where operand of copy cannot be assigned.

[Quentin Colombet via Phabricator via llvm-commits]

qcolombet added a comment.

> It sounds like we need to have the fast-RA be able to defer to the more sophisticated allocators in certain cases.

That's a good idea! We could do something similar to what we do with GISel: set some function attributes to inform the other allocators whether or not they have something to do.

Now, ideally, I wish we had one performant allocator that works fast enough for O0.


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