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Commit 3224543b authored by Michael Liao's avatar Michael Liao
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Fix PR12359 

- In addition to undefined, if V2 is zero vector, skip 2nd PSHUFB and POR as
  well as PSHUFB will zero elements with negative indices.

  Patch by Sriram Murali <sriram.murali@intel.com>

llvm-svn: 163018
parent 0e337543
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