[PATCH] D27793: Don't combine splats with other shuffles.

[Eli Friedman via Phabricator via llvm-commits]

efriedma created this revision.
efriedma added reviewers: mkuper, craig.topper, RKSimon.
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We often end up creating shuffles which are worse than the obvious translation of the IR.

Depends on https://reviews.llvm.org/D27787 .

Fixes https://llvm.org/bugs/show_bug.cgi?id=31301 .


Repository:
  rL LLVM

https://reviews.llvm.org/D27793

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

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