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a069e64112
This patch moves part of the logic implemented by the target specific combine rules added at r210477 to a separate helper function. This should make easier to add more rules for matching AVX/AVX2 horizontal adds/subs. This patch also fixes a problem caused by a wrong check performed on indices of extract_vector_elt dag nodes in input to the scalar adds/subs. New tests have been added to verify that we correctly check indices of extract_vector_elt dag nodes when selecting a horizontal operation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210644 91177308-0d34-0410-b5e6-96231b3b80d8
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