[PATCH] D81914: [AMDGPU] Avoid use of V_READLANE into EXEC in SGPR spills

[Carl Ritson via Phabricator via llvm-commits]

critson created this revision.
critson added reviewers: arsenm, dstuttard, rampitec, sameerds.
Herald added subscribers: llvm-commits, kerbowa, hiraditya, t-tye, tpr, yaxunl, nhaehnle, wdng, jvesely, kzhuravl, qcolombet.
Herald added a project: LLVM.

Depends on D81224 <https://reviews.llvm.org/D81224>.
Always prefer to clobber input SGPRs and restore them after the
spill.  This applies to both spills to VGPRs and scratch.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D81914

Files:
  llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp
  llvm/lib/Target/AMDGPU/SIRegisterInfo.h
  llvm/test/CodeGen/AMDGPU/sgpr-spill.mir
  llvm/test/CodeGen/AMDGPU/spill-special-sgpr.mir

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