[PATCH] D114700: AMDGPU/GlobalISel: Fix constant bus restriction errors for med3

[Petar Avramovic via Phabricator via llvm-commits]

Petar.Avramovic created this revision.
Petar.Avramovic added reviewers: foad, arsenm, sebastian-ne.
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Move sgpr operands that violate constant bus restriction to vgpr
when creating med3 in post-regbankselect combiner.
SDAG does this in postiselhook via legalizeOperandsVOP3.
Detected on targets older then gfx10 (e.g. gfx9) for constants
that are too large to be inlined (constant are sgpr by default).


https://reviews.llvm.org/D114700

Files:
  llvm/lib/Target/AMDGPU/AMDGPURegBankCombiner.cpp
  llvm/test/CodeGen/AMDGPU/GlobalISel/regbankcombiner-smed3.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/regbankcombiner-umed3.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/smed3.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/umed3.ll

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