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

[Karthik Bhat]

Hi Michael,
Thanks for the input. I really appreciate your help in the review process. I will rename the variables and update the patch as per review comments shortly.
Just one clarification here.
In your example -

  b[0]     b[0]
  b[1]     a[0]+c[0]
  b[2]     a[1]*c[1]
  b[3]     d[5]/e[6]

Post reordering i think we will still have good load order but in the right lane instead of left lane. If I'm not wrong we would get something like-

      b[0]     b[0]
  a[0]+c[0]    b[1]
  a[1]*c[1]    b[2]    
  d[5]/e[6]    b[3] 

retaining AllSameOpcode on right instead of left now.

Thanks and Regards
Karthik Bhat


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http://reviews.llvm.org/D6677

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