[PATCH] D12125: [DAGCombiner] Fold CONCAT_VECTORS of EXTRACT_SUBVECTOR (or undef) to VECTOR_SHUFFLE.

[Simon Pilgrim via llvm-commits]

RKSimon updated this revision to Diff 32541.
RKSimon added a comment.

Thanks Andrea, we've used the (Level < AfterLegalizeVectorOps && TLI.isTypeLegal(VT)) pattern in a lot of other shuffle code so don't have a problem adding it here.


Repository:
  rL LLVM

http://reviews.llvm.org/D12125

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/X86/pr15267.ll
  test/CodeGen/X86/vector-shuffle-256-v16.ll
  test/CodeGen/X86/vector-shuffle-256-v4.ll
  test/CodeGen/X86/vector-shuffle-256-v8.ll

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