[PATCH] [LoopVectorize]Teach Loop Vectorizer about interleaved memory access

[Hao Liu]

Hi,

I update a new patch according to the comments from Michael and the patch in PR17677 by Renato.

This patch also fixes the WriteAfterWrite issue I mentioned in last comment. 2 new test cases are added.

Review please.

Thanks,
-Hao


http://reviews.llvm.org/D9368

Files:
  include/llvm/Analysis/LoopAccessAnalysis.h
  include/llvm/Analysis/TargetTransformInfo.h
  include/llvm/Analysis/TargetTransformInfoImpl.h
  include/llvm/CodeGen/BasicTTIImpl.h
  lib/Analysis/LoopAccessAnalysis.cpp
  lib/Analysis/TargetTransformInfo.cpp
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/AArch64/arbitrary-induction-step.ll
  test/Transforms/LoopVectorize/interleaved-access.ll

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