[PATCH] D25589: AMDGPU: Fix using incorrect private resource with no allocation

[Matt Arsenault via llvm-commits]

arsenm created this revision.
arsenm added a subscriber: llvm-commits.
Herald added subscribers: tony-tye, yaxunl, nhaehnle, wdng, kzhuravl, qcolombet.
Herald added a reviewer: tstellarAMD.

It's possible to have a use of the private resource descriptor or
scratch wave offset registers even though there are no allocated
stack objects. This would result in continuing to use the maximum
number reserved registers. This could go over the number of SGPRs
available on VI, or violate the SGPR limit requested by
the function attributes.


https://reviews.llvm.org/D25589

Files:
  lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp
  lib/Target/AMDGPU/SIFrameLowering.cpp
  lib/Target/AMDGPU/SIInstrInfo.cpp
  lib/Target/AMDGPU/SIRegisterInfo.cpp
  test/CodeGen/AMDGPU/attr-amdgpu-flat-work-group-size.ll
  test/CodeGen/AMDGPU/attr-amdgpu-num-sgpr.ll
  test/CodeGen/AMDGPU/attr-amdgpu-waves-per-eu.ll
  test/CodeGen/AMDGPU/flat-scratch-reg.ll
  test/CodeGen/AMDGPU/private-access-no-objects.ll
  test/CodeGen/AMDGPU/si-sgpr-spill.ll
  test/CodeGen/AMDGPU/spill-alloc-sgpr-init-bug.ll
  test/CodeGen/AMDGPU/spill-m0.ll
  test/CodeGen/AMDGPU/wqm.ll

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