[PATCH] D25524: [DAGCombine] Preserve shuffles when one of the vector operands is constant

[Zvi Rackover via llvm-commits]

zvi updated this revision to Diff 75527.
zvi added a comment.

- Using @andreadb's improved early-exit conditions
- Moved the helper function to a more suitable location


Repository:
  rL LLVM

https://reviews.llvm.org/D25524

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

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