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Simon Pilgrim 0c78aae183 [CostModel][X86] Improve accuracy of sext/zext to 256-bit vector costs on AVX1 targets
Determined from llvm-mca analysis (btver2 vs bdver2 vs sandybridge), the split+extends+concat sequence on AVX1 capable targets are cheaper than the #ops that the cost was previously based on.
2021-05-27 18:17:50 +01:00
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