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Commit 310a9a4f authored by Simon Pilgrim's avatar Simon Pilgrim
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[X86] matchBinaryShuffle - relax PACKSS for v2i64 -> v4i32 shuffle truncation pattern match. 

Similar to combineVectorSignBitsTruncation, we don't require all-signbits source inputs, just enough signbits to reach into the lowest i16 to safely use PACKSSDW.
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