[PATCH] D45439: [IRCE] Use NUW flag for indvar

[Sam Parker via Phabricator via llvm-commits]

samparker created this revision.
samparker added a reviewer: mkazantsev.

IsInductionVar currently looks for nsw properties for the induction variable, and this patch now adds the use of nuw. isKnownNonNegative has also been added as a helper function which uses isLoopEntryGuardedByCond to check that the value is greater or equal than zero. If this is valid, I will extract it out into SCEV's isKnownNonNegative.


https://reviews.llvm.org/D45439

Files:
  lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp
  test/Transforms/IRCE/stride_more_than_1.ll
  test/Transforms/IRCE/variable-loop-bounds.ll

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