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In AVX 256bit vectors are valid vectors and therefore the Type Legalizer doesn't split the VSELECT and SETCC nodes. AVX only supports MIN/MAX on 128bit vectors and this fix enables vector splitting for this special case in the X86 DAG Combiner. This fix is related to PR16695, PR17002, and <rdar://problem/14594431>. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191131 91177308-0d34-0410-b5e6-96231b3b80d8
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