[PATCH] Add support to vectorize ctlz, cttz and powi intrinsics in SLPVectorizer

[Karthik Bhat]

Hi All,
First of sorry my last reply from my id seems to have introduced some junk char in the mail chain.

I have updated the patch to directly compare Value* instead of comparing SCEV as per comments.
As Nick mentioned the above mentioned IR example may not be generated when compiling with optimizations as gvn,cse,basicaa and dce would have removed these redundant code. 
The above mentioned IR was handcoded to highlight the benifit of using SCEV but as the basic transforms such as gvn,cse etc runs before vectorization this may not be required.

I have updated the patch accordingly to directly compare arguments instead of SCEV. Does this look good to commit?

Thanks
Karthik Bhat

http://reviews.llvm.org/D3851

Files:
  include/llvm/Transforms/Utils/VectorUtils.h
  lib/Transforms/Vectorize/SLPVectorizer.cpp
  test/Transforms/SLPVectorizer/X86/intrinsic.ll
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