[PATCH] D58585: [DAGCombine] Add undef shuffle elt support to partitionShuffleOfConcats

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: craig.topper, spatel, niravd, efriedma.
Herald added a project: LLVM.

Support undef shuffle mask indices in the shuffle(concat_vectors, concat_vectors) -> concat_vectors fold


Repository:
  rL LLVM

https://reviews.llvm.org/D58585

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/X86/subvector-broadcast.ll

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