[PATCH] D143182: CodeGen: Optimize lowering of is.fpclass fcZero|fcSubnormal

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: jcranmer-intel, kpn, sepavloff, andrew.w.kaylor.
Herald added subscribers: kosarev, kerbowa, pengfei, hiraditya, jvesely.
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arsenm requested review of this revision.
Herald added a subscriber: wdng.
Herald added a project: LLVM.

Combine the two checks into a check if the exponent bits are 0. The
inverted case isn't reachable until a future change, and GlobalISel
currently doesn't attempt the inversion optimization.


https://reviews.llvm.org/D143182

Files:
  llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/test/CodeGen/AMDGPU/llvm.is.fpclass.f16.ll
  llvm/test/CodeGen/X86/is_fpclass.ll

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