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Author SHA1 Message Date
Tony Jiang 0a429f040e [PowerPC] Fix a performance bug for PPC::XXSLDWI. 
There are some VectorShuffle Nodes in SDAG which can be selected to XXSLDWI
instruction, this patch recognizes them and does the selection to improve the
PPC performance.

llvm-svn: 303822
 2017-05-24 23:48:29 +00:00