[PATCH] D91716: AMDGPU/GlobalISel: Calculate isKnownNeverNaN for fminnum and fmaxnum

[Petar Avramovic via Phabricator via llvm-commits]

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G_FMINNUM_IEEE and G_FMAXNUM_IEEE are never SNaN by definition.
When IEEE is set to true G_FMINNUM and G_FMAXNUM are lowered to
G_FMINNUM_IEEE and G_FMAXNUM_IEEE meaning they are never SNaN in
this mode. By default G_FMINNUM and G_FMAXNUM may be SNaN,
but since this might be target dependent allow option to override
default behavior via isKnownNeverNaNForMI in TargetLowering.


https://reviews.llvm.org/D91716

Files:
  llvm/include/llvm/CodeGen/TargetLowering.h
  llvm/lib/CodeGen/GlobalISel/Utils.cpp
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
  llvm/lib/Target/AMDGPU/AMDGPUISelLowering.h
  llvm/test/CodeGen/AMDGPU/GlobalISel/fmed3.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-fmaxnum.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-fminnum.mir

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