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Commit 62fca69a authored by Simon Pilgrim's avatar Simon Pilgrim
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[CostModel][X86][AVX2] Improve 256-bit vector non-uniform shifts costs 

Haswell, Excavator and early Ryzen all have slower 256-bit non-uniform vector shifts (confirmed on AMDSoG/Agner/instlatx64 and llvm models) - so bump the worst case costs accordingly.

Noticed while investigating PR50364
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