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Commit a7d107a3 authored by Simon Pilgrim's avatar Simon Pilgrim
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[X86] SimplifyDemandedVectorEltsForTargetNode - pull out vector halving code. NFCI. 

Pull out the HADD/HSUB code to halve vector widths if the upper half isn't used - prep work to adding support for other opcodes.

llvm-svn: 359667
parent 99eefe94
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