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

[Michael Kuperstein via llvm-commits]

mkuper added inline comments.


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Comment at: lib/CodeGen/SelectionDAG/DAGCombiner.cpp:13737
 
+// Checks for a BUILD_VECTOR composed of either all-undef's, or constants
+// possibly mixed with undef's.
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Any chance we can put this in a place that makes more sense?
See discussion on D25685.


Repository:
  rL LLVM

https://reviews.llvm.org/D25524