[PATCH] D93144: RegisterCoalescer: Fix not setting undef on coalesced subregister uses

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: qcolombet, MatzeB, kparzysz, rampitec, foad, tpr, dstuttard.
Herald added subscribers: kerbowa, hiraditya, nhaehnle, jvesely.
arsenm requested review of this revision.
Herald added a subscriber: wdng.
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This was only adding undef to the use if the copy itself had a
subregister index. It did not consider the subrange liveness if the
use had a subreg index to begin with.


https://reviews.llvm.org/D93144

Files:
  llvm/lib/CodeGen/RegisterCoalescer.cpp
  llvm/test/CodeGen/AMDGPU/undef-subreg-use-after-coalesce.mir

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