[PATCH] D47986: [CostModel] Treat Identity shuffle masks as zero cost

[Sanjay Patel via Phabricator via llvm-commits]

spatel added a comment.

We should fold these in InstSimplify, so assigning a zero cost seems appropriate, but that raises the question: who's creating these? Couldn't they call llvm::SimplifyShuffleVectorInst() and short-circuit the problem?


Repository:
  rL LLVM

https://reviews.llvm.org/D47986