[PATCH] D159084: InstCombine: Fold is.fpclass(x, fcInf) to fabs+fcmp

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: sepavloff, jcranmer-intel, foad, andrew.w.kaylor, kpn, cameron.mcinally.
Herald added subscribers: StephenFan, hiraditya.
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arsenm requested review of this revision.
Herald added a subscriber: wdng.
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This is a better canonical form. fcmp and fabs are more widely
understood and fabs can fold for free into some sources.

Addresses todo from D146170 <https://reviews.llvm.org/D146170>


https://reviews.llvm.org/D159084

Files:
  llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
  llvm/test/Transforms/InstCombine/and-fcmp.ll
  llvm/test/Transforms/InstCombine/combine-is.fpclass-and-fcmp.ll
  llvm/test/Transforms/InstCombine/create-class-from-logic-fcmp.ll
  llvm/test/Transforms/InstCombine/is_fpclass.ll

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