[PATCH] D132308: [LV] Replace fixed-order cost model with a SK_Splice shuffle

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

In D132308#3737485 <https://reviews.llvm.org/D132308#3737485>, @xbolva00 wrote:

>>> existing cost model can drastically under-estimate the correct cost for the shuffle …. and some targets may require additions to the cost-model to correctly account for them.
>
> Hm, sounds like your fix improves some targets and at the same time possibly regresses others?

For now, please can you add a SK_Splice -> SK_PermuteTwoSrc remapping to targets with getShuffleCost that don't recognise SK_Splice?


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https://reviews.llvm.org/D132308