[PATCH] D137632: [LoopPredication] Widen checks if condition operands constant ranges are known

[Dmitry Makogon via Phabricator via llvm-commits]

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This enables LoopPredication to widen checks of the following form:

  x < guardLimit,

where x and guardLimit have known constant ranges (meaning they are not
full-set). If they are reasonably small and max(x) <= max(guardLimit), we
can predicate the loop with the condition max(x) <= guardLimit.


https://reviews.llvm.org/D137632

Files:
  llvm/lib/Transforms/Scalar/LoopPredication.cpp
  llvm/test/Transforms/LoopPredication/constant-ranges.ll

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