[PATCH] D119661: [LV] Support chained phis as incoming values for first-order recurs.

[Dave Green via Phabricator via llvm-commits]

dmgreen added a comment.

Hello - We are seeing some pretty large regressions from this, I think because of the cost model and MVE not having a very good way at the moment of lowering the shuffles that get produced. MVE doesn't have a 'ext' / 'vector.splice' instruction, and the cost model seems to currently be modelled as a v1 extract. Do you have any objections to changing the cost model to use a SK_Splice?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D119661/new/

https://reviews.llvm.org/D119661