[PATCH] D115402: AMDGPU: Add second emergency slot for SGPR to vmem for large frames

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
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In a future change, we will sometimes use a VGPR offset for doing
spills to memory, in which case we need 2 free VGPRs to do the SGPR
spill. In most cases we could spill the VGPR along with the SGPR being
spilled, but we don't have any free lanes for SGPR_1024 in wave32 so
we could still potentially need a second scavenging slot.


https://reviews.llvm.org/D115402

Files:
  llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
  llvm/lib/Target/AMDGPU/SILowerSGPRSpills.cpp
  llvm/lib/Target/AMDGPU/SIMachineFunctionInfo.cpp
  llvm/lib/Target/AMDGPU/SIMachineFunctionInfo.h
  llvm/test/CodeGen/AMDGPU/sgpr-spill-vmem-large-frame.mir

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