[PATCH] D68195: [DAGCombiner] Peek through vector concats when trying to combine shuffles.

[Amaury SECHET via Phabricator via llvm-commits]

deadalnix created this revision.
deadalnix added reviewers: craig.topper, efriedma, RKSimon, lebedev.ri.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.

This combine showed up as needed when exploring the regression when processing the DAG in topological order.


Repository:
  rL LLVM

https://reviews.llvm.org/D68195

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/X86/vector-shuffle-combining.ll

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