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Commit dd7ba380 authored by Simon Pilgrim's avatar Simon Pilgrim
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[X86] matchTruncateWithPACK - consistently prefer shuffles for truncation to sub-64-bit vXi16 

If we're truncating from v2i32 / v2i64 then PSHUFLW / PSHUFD+PSHUFLW should more easily allow further shuffle combines than a PACK chain will
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