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* [PowerPC] Fix a performance bug for PPC::XXPERMDI.Tony Jiang2017-05-311-0/+307
There are some VectorShuffle Nodes in SDAG which can be selected to XXPERMDI Instruction, this patch recognizes them and does the selection to improve the PPC performance. Differential Revision: https://reviews.llvm.org/D33404 llvm-svn: 304298
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