[PATCH] D96605: AMDGPU/GlobalISel: Remove redundant G_FCANONICALIZE

[Petar Avramovic via Phabricator via llvm-commits]

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G_FMINNUM_IEEE and G_FMAXNUM_IEEE are known to be never SNaN
and there is no need to quiet them using G_FCANONICALIZE.
Add post legalizer combine that deletes such G_FCANONICALIZE and
replaces its uses with input (G_FMINNUM_IEEE or G_FMAXNUM_IEEE) register.


https://reviews.llvm.org/D96605

Files:
  llvm/lib/Target/AMDGPU/AMDGPUCombine.td
  llvm/lib/Target/AMDGPU/AMDGPUPostLegalizerCombiner.cpp
  llvm/test/CodeGen/AMDGPU/GlobalISel/combine-fcanonicalize.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/fmed3.ll

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