[PATCH] D31961: DAGCombine: Combine shuffles of splat-shuffles

[Zvi Rackover via Phabricator via llvm-commits]

zvi created this revision.

Reapply r299047, but this time handle correctly splat-masks with undef elements.


Repository:
  rL LLVM

https://reviews.llvm.org/D31961

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/X86/shuffle-of-splat-multiuses.ll

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