[PATCH] D147902: ValueTracking: Implement computeKnownFPClass for fpext

[Matt Arsenault via Phabricator via llvm-commits]

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Not sure the denormal handling logic applies for some of the exotic FP types


https://reviews.llvm.org/D147902

Files:
  llvm/lib/Analysis/ValueTracking.cpp
  llvm/test/Transforms/Attributor/nofpclass-fpext.ll

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