[PATCH] D43810: [SCEV] Smart range calculation for SCEVUnknown Phis

[Max Kazantsev via Phabricator via llvm-commits]

mkazantsev created this revision.
mkazantsev added reviewers: sanjoy, skatkov, reames.

The range of SCEVUnknown Phi which merges values `X1, X2, ..., XN`
 can be evaluated as `U(Range(X1), Range(X2), ..., Range(XN))`.


https://reviews.llvm.org/D43810

Files:
  include/llvm/Analysis/ScalarEvolution.h
  lib/Analysis/ScalarEvolution.cpp
  test/Analysis/ScalarEvolution/unknown_phis.ll
  test/Transforms/IRCE/single-access-no-preloop.ll
  test/Transforms/LoopVectorize/X86/consecutive-ptr-cg-bug.ll

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