[PATCH] [SLPVectorizer] Reorder operands of shufflevector if it can result in a vectorized code.

[Karthik Bhat]

Hi Michael,
Thanks for the clarifications. Updated the code to handle reordering for any commutative binary vector operation were it is profitable.
Post this we are able to optimally vectorize your example.
Please let me know if this looks good to you.

Thanks and Regards
Karthik Bhat


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6677

Files:
  lib/Transforms/Vectorize/SLPVectorizer.cpp
  test/Transforms/SLPVectorizer/X86/addsub.ll
  test/Transforms/SLPVectorizer/X86/operandorder.ll

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