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[X86] lowerShuffleWithVPMOV - remove unnecessary shuffle commutation. NFCI.

Authored by RKSimon on Aug 19 2020, 5:28 AM.

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[X86] lowerShuffleWithVPMOV - remove unnecessary shuffle commutation. NFCI.

canonicalizeShuffleMaskWithCommute should have already ensured the lower elements are from V1, we do have test coverage for this already.

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Committed
RKSimonAug 19 2020, 5:28 AM
Parents
rGb61cef3a921b: [X86][AVX] getAVX512TruncNode - don't truncate from illegal vector widths.
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