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Commit 8ae0e1f5 authored by Simon Pilgrim's avatar Simon Pilgrim
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[X86] Create X86ISD::SHUF128 512-bit masks with getV4X86ShuffleImm8ForMask 

This allows us to use the same canonicalizations as PSHUFD/SHUFPS etc. to avoid unnecessary demanded elts (better splat detection, blend pass through etc.) instead of defaulting to zero mask values.
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