[PATCH] D90052: AMDGPU/GlobalISel: Add clamp combine for IEEE=false

[Petar Avramovic via Phabricator via llvm-commits]

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Add clamp combine for IEEE mode set to false (shaders prefer this setting).
Source is fminnum(fmaxnum(Val, K0), K1 <https://reviews.llvm.org/K1>) or fmaxnum(fminnum(Val, K1 <https://reviews.llvm.org/K1>), K0)
with K0=0.0 and K1 <https://reviews.llvm.org/K1>=1.0 or fmed3 intrinsic with 0.0 and 1.0 as two out of
three operands.


https://reviews.llvm.org/D90052

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/clamp.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/postlegalizercombiner-clamp.mir

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