[PATCH] D49662: DAG: Enhance isKnownNeverNaN

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: scanon.
Herald added subscribers: tpr, nhaehnle, wdng.

Add a parameter for testing specifically for
sNaNs - at least one instruction pattern on AMDGPU
needs to check specifically for this.

      

Also handle more cases, and add a target hook
for custom nodes, similar to the hooks for known
bits.

I'll merge https://reviews.llvm.org/D49561 into this later


https://reviews.llvm.org/D49662

Files:
  include/llvm/CodeGen/SelectionDAG.h
  include/llvm/CodeGen/TargetLowering.h
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  lib/CodeGen/SelectionDAG/TargetLowering.cpp
  lib/Target/AMDGPU/SIISelLowering.cpp
  test/CodeGen/AMDGPU/clamp.ll
  test/CodeGen/AMDGPU/fmed3.ll
  test/CodeGen/AMDGPU/fmul-2-combine-multi-use.ll
  test/CodeGen/AMDGPU/known-never-snan.ll

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