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clang-p2996/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
Craig Topper d1eca0f32c [CodeGen] Teach OR combine of shuffles involving zero vectors to better handle undef indices. 
Undef indices can now be treated as zeros. Or if its undef ORed with zero, we will keep the undef.

llvm-svn: 274472
2016-07-03 19:37:12 +00:00

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