[PATCH] D153089: ValueTracking: Recognize fpclass clamping select patterns

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
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Improve computeKnownFPClass select handling to cover the case where
the condition performs a class test. This allows us to recognize
no-nans in cases like:

    
  %not.nan = fcmp ord float %x, 0.0
  %select = select i1 %not.nan, float %x, float 0.0
    

Math library code has edge similar edge case filtering on the inputs
and final results.


https://reviews.llvm.org/D153089

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

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