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[X86][SSE] combineTargetShuffle - use scaleShuffleMask helper to widen shuffle…

Authored by RKSimon on Aug 8 2020, 11:35 AM.

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[X86][SSE] combineTargetShuffle - use scaleShuffleMask helper to widen shuffle mask. NFCI.

Use scaleShuffleMask helper for the shuffle(hadd,hadd) canonicalization.

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Committed
RKSimonAug 8 2020, 11:36 AM
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rG44b260cb0aab: [X86] Increase the number of instructions searched for isSafeToClobberEFLAGS in…
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