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[X86][SSE] Add scalar horizontal add/sub tests for element extractions from…

Description

[X86][SSE] Add scalar horizontal add/sub tests for element extractions from upper lanes

As suggested on D61263

Details

Committed
RKSimonMay 1 2019, 4:17 AM
Parents
rL359670: [X86][SSE] Add X86ISD::UNPCKL\UNPCK to SimplifyDemandedVectorEltsForTargetNode…
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