[PATCH] D122286: [AMDGPU] VGPR need to be reserved for AGPR copy *only* on subtarget GFX908

[Mahesha S via Phabricator via llvm-commits]

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Indirect SGPR to AGPR copy, and AGPR to AGPR copy via an intermediate
VGPR copy is required *only* on subtarget GFX908. Hence no need to reserve
VGPR on other MI targets.

Add a missing testcase for SGPR to AGPR copy which would fail without a
reserved VGPR on GFX908.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D122286

Files:
  llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
  llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp
  llvm/test/CodeGen/AMDGPU/agpr-copy-no-free-registers.ll

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