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* [DAGCombiner] Update most ADD combines to support general vector combinesSimon Pilgrim2016-10-121-50/+27
| | | | | | | | Add a number of helper functions to match scalar or vector equivalent constant/splat values to allow most of the combine patterns to be used by vectors. Differential Revision: https://reviews.llvm.org/D25374 llvm-svn: 284015
* [X86][SSE] Added vector add combine testsSimon Pilgrim2016-09-161-0/+339
Some work great and others currently demonstrate the anti-vector bias prevalent in DAGCombiner llvm-svn: 281768
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