[PATCH] D127964: [DCE] Eliminate no-op atan and atan2 calls

[Mohammed Nurul Hoque via Phabricator via llvm-commits]

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>From the opengroup specifications, atan2 fails if the result underflows and atan fails if the argument is subnormal.
In other cases we can eliminate the call to atan/atan2.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D127964

Files:
  llvm/lib/Analysis/ConstantFolding.cpp
  llvm/test/Transforms/InstCombine/elimAtan.ll
  llvm/test/Transforms/InstSimplify/ConstProp/math-1.ll
  llvm/test/Transforms/InstSimplify/ConstProp/math-2.ll

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