Simon Pilgrim bbfdb8cc2d [CostModel][X86] Add scalar rotate-by-immediate costs
As noted on #63980 rotate by immediate amounts is much cheaper than variable amounts.

This still needs to be expanded to vector rotate cases, and we need to add reasonable funnel-shift costs as well (very tricky as there's a huge range in CPU behaviour for these).
2023-07-27 16:54:30 +01:00
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