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...hese instructions are no longer unpredictable the rest of the compiler should know about them too, not just the MC layer, so this is even more of a hack," - and he suggested instead converting every instruction that takes an rGPR operand into a multiclass of two instructions, one predicated on HasV8Ops, and the other on its inverse. This isn't practical, however: ARMInstrThumb2.td specifies several hundred individual encodings, InstAliases and match patterns that use rGPR, and all these would need to be manually duplicated. Right now, we're trying to come up with a more sensible appr...