Amara Emerson 67a8775322 [AArch64] Don't generate gpr CSEL instructions in early-ifcvt if regclasses aren't compatible. ...

In GlobalISel we may in some unfortunate circumstances generate PHIs with
operands that are on separate banks. If-conversion doesn't currently check for
that case and ends up generating a CSEL on AArch64 with incorrect register
operands.

Differential Revision: https://reviews.llvm.org/D72961

2020-01-21 16:51:31 -08:00

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