[PATCH] Exploit dereferenceable_or_null attribute in LICM pass

[Artur Pilipenko]

Rebased patch.


http://reviews.llvm.org/D9253

Files:
  include/llvm/Analysis/ValueTracking.h
  include/llvm/Transforms/Utils/LoopUtils.h
  lib/Analysis/ValueTracking.cpp
  lib/Transforms/Scalar/LICM.cpp
  test/Transforms/LICM/hoist-deref-load.ll

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