[PATCH] D115807: AMDGPU: Use v_accvgpr_mov_b32 when copying AGPR tuples on gfx90a

[Matt Arsenault via Phabricator via llvm-commits]

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This is an optimization, but also fixes a compile failure when no free
VGPRs are available. The problem still exists for gfx908 where a
scratch register is still required. This also still exists for the
SGPR to AGPR case.


https://reviews.llvm.org/D115807

Files:
  llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
  llvm/test/CodeGen/AMDGPU/accvgpr-copy.mir
  llvm/test/CodeGen/AMDGPU/agpr-copy-no-vgprs.mir
  llvm/test/CodeGen/AMDGPU/agpr-copy-sgpr-no-vgprs.mir

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