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Commit 77dcdc2f authored by Simon Pilgrim's avatar Simon Pilgrim
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[CostModel][X86] Pre-SSE41 targets can use PMADDWD for sext sub-i16 -> i32 

Without SSE41 sext/zext instructions the extensions will be split, meaning that the MUL->PMADDWD fold will split the sext_i32(x) into zext_i32(sext_i16(x))
parent 16729d0f
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