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Commit eb7c78c2 authored by Simon Pilgrim's avatar Simon Pilgrim
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[X86][SSE] combineMulToPMADDWD - mask off upper bits of sign-extended vXi32 constants 

If we are multiplying by a sign-extended vXi32 constant, then we can mask off the upper 16 bits to allow folding to PMADDWD and make use of its implicit sign-extension from i16
parent 2a4fa0c2
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