[PATCH] D27787: Don't combine a shuffle of two BUILD_VECTORs in general.

[Eli Friedman via Phabricator via llvm-commits]

efriedma updated this revision to Diff 81622.
efriedma added a comment.

More "conservative" patch.  This just tries to specifically detect splat-ish cases.

Not sure this actually covers every interesting case, but I don't have any other ideas.


Repository:
  rL LLVM

https://reviews.llvm.org/D27787

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/ARM/vtrn.ll
  test/CodeGen/ARM/vzip.ll
  test/CodeGen/X86/oddshuffles.ll
  test/CodeGen/X86/vector-shuffle-128-v16.ll

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