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Commit 8c58c066 authored by Simon Pilgrim's avatar Simon Pilgrim
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[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

llvm-svn: 231581
parent a99e152e
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