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[CostModel][X86] Add initial costs for non-lane-crossing one/two input shuffles #114254

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[CostModel][X86] Add initial costs for non-lane-crossing one/two input shuffles #114254

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Commits on Oct 30, 2024

  1. [CostModel][X86] Add initial costs for non-lane-crossing one/two inpu… 

    …t shuffles

Most of the x86 shuffle instructions operate within each 128-bit subvector lane, but our shuffle costs struggle to handle this and have to fallback to worst case shuffles that reference elements from any lane.

This patch detects shuffle masks that we know are "inlane" and enable us to assume a cheaper shuffle cost.
    @RKSimon
    RKSimon committed Oct 30, 2024
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