[PATCH] D90050: AMDGPU/GlobalISel: Add integer med3 combines

[Petar Avramovic via Phabricator via llvm-commits]

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Add signed and unsigned integer version of med3 combine.
Source pattern is min(max(Val, K0), K1 <https://reviews.llvm.org/K1>) or max(min(Val, K1 <https://reviews.llvm.org/K1>), K0)
where K0 and K1 <https://reviews.llvm.org/K1> are constants and K0 < K1 <https://reviews.llvm.org/K1>. Destination is med3
that corresponds to signedness of min/max in source.


https://reviews.llvm.org/D90050

Files:
  llvm/lib/Target/AMDGPU/AMDGPUCombine.td
  llvm/lib/Target/AMDGPU/AMDGPUGISel.td
  llvm/lib/Target/AMDGPU/AMDGPUPostLegalizerCombiner.cpp
  llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
  llvm/lib/Target/AMDGPU/SIInstructions.td
  llvm/test/CodeGen/AMDGPU/GlobalISel/postlegalizercombiner-smed3.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/postlegalizercombiner-umed3.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/smed3.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/umed3.ll

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