Simon Pilgrim b8056be62c [DAGCombiner] Add a shuffle mask commutation helper function. NFCI. ...

We have an increasing number of cases where we are creating commuted shuffle masks - all implementing nearly the same code.

This patch adds a static helper function - ShuffleVectorSDNode::commuteMask() and replaces a number of cases to use it.

Differential Revision: http://reviews.llvm.org/D8139

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231581 91177308-0d34-0410-b5e6-96231b3b80d8

2015-03-07 22:33:11 +00:00

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