[PATCH] D86806: AMDGPU: Fix incorrectly deleting copies after spilling SGPR tuples

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
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Herald added subscribers: danielkiss, hiraditya, t-tye, tpr, dstuttard, yaxunl, nhaehnle, jvesely, kzhuravl, qcolombet.
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The implicit def of the super register would appear to kill any live
uses of components before the spill, and would be deleted by
MachineCopyPropagation. We need to add implicit uses of the super
register, similarly to what copyPhysReg does. VGPR tuples appear to be
correctly handled already. I need to double check the SGPR->memory
path.


https://reviews.llvm.org/D86806

Files:
  llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp
  llvm/test/CodeGen/AMDGPU/spill-reg-tuple-super-reg-use.mir
  llvm/test/CodeGen/AMDGPU/spill192.mir

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