[PATCH] D55452: [CostModel][X86] Teach getArithmeticReductionCost to properly cost the shuffles needed for a PairWise reduction before we reach a legal type. And remove one shuffle from the end of the reduction.

[Craig Topper via Phabricator via llvm-commits]

craig.topper updated this revision to Diff 177402.
craig.topper added a comment.

Use ShufLT.second.getVectorNumElements() to create the ShufTy.


Repository:
  rL LLVM

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D55452/new/

https://reviews.llvm.org/D55452

Files:
  include/llvm/CodeGen/BasicTTIImpl.h
  test/Analysis/CostModel/X86/reduction.ll

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