[PATCH] D38494: [ScalarEvolution] Handling for ICmp occuring in then evolution chain.

[Jatin Bhateja via Phabricator via llvm-commits]

jbhateja created this revision.
Herald added a subscriber: sanjoy.

If a compare instruction is same or inverse of the compare in the
 branch of the loop latch, then return a constant evolution node. 
 This shall facilitate computations of loop exit counts in cases 
 where compare appears in the evolution chain of induction variables.

Will fix PR 34538


https://reviews.llvm.org/D38494

Files:
  include/llvm/Analysis/ScalarEvolution.h
  lib/Analysis/ScalarEvolution.cpp
  lib/Transforms/Scalar/LoopStrengthReduce.cpp
  test/Analysis/ScalarEvolution/pr34538.ll

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