[PATCH] D117253: [AMDGPU] Select VGPR versions of MFMA is possible

[Stanislav Mekhanoshin via Phabricator via llvm-commits]

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We can select _vgprcd versions of MAI instructions and have no
AGPRs with the whole budget left for VGPRs if:

1. This is a kernel;
2. It has no calls;
3. It runs at least on 2 waves thus having not more that 256 VGPRs.
4. There is no inline asm requesting AGPRs.


https://reviews.llvm.org/D117253

Files:
  llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
  llvm/lib/Target/AMDGPU/SIMachineFunctionInfo.cpp
  llvm/lib/Target/AMDGPU/SIMachineFunctionInfo.h
  llvm/lib/Target/AMDGPU/VOP3PInstructions.td
  llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.mfma.gfx90a.ll
  llvm/test/CodeGen/AMDGPU/acc-ldst.ll
  llvm/test/CodeGen/AMDGPU/gfx90a-enc.ll
  llvm/test/CodeGen/AMDGPU/llvm.amdgcn.mfma.bf16.ll
  llvm/test/CodeGen/AMDGPU/llvm.amdgcn.mfma.gfx90a.ll
  llvm/test/CodeGen/AMDGPU/llvm.amdgcn.mfma.i8.ll
  llvm/test/CodeGen/AMDGPU/llvm.amdgcn.mfma.ll
  llvm/test/CodeGen/AMDGPU/mfma-bf16-vgpr-cd-select.ll
  llvm/test/CodeGen/AMDGPU/mfma-cd-select.ll
  llvm/test/CodeGen/AMDGPU/mfma-loop.ll
  llvm/test/CodeGen/AMDGPU/mfma-vgpr-cd-select.ll
  llvm/test/CodeGen/AMDGPU/partial-regcopy-and-spill-missed-at-regalloc.ll
  llvm/test/CodeGen/AMDGPU/spill-agpr.ll

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