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

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon updated this revision to Diff 150906.
RKSimon added a comment.

Refreshed with tests for RHS Identity shuffles


Repository:
  rL LLVM

https://reviews.llvm.org/D47986

Files:
  lib/Analysis/TargetTransformInfo.cpp
  test/Analysis/CostModel/X86/reduction.ll
  test/Analysis/CostModel/X86/shuffle-single-src.ll

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