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Commit 0a429f04 authored by Tony Jiang's avatar Tony Jiang
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[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
parent 8b78185e
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