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8ca089df49
The function was making too many assumptions about its input: 1. The NEON_VDUP optimisation was far too aggressive, assuming (I think) that the input would always be BUILD_VECTOR. 2. We were treating most unknown concats as legal (by returning Op rather than SDValue()). I think only concats of pairs of vectors are actually legal. http://llvm.org/PR19094 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203450 91177308-0d34-0410-b5e6-96231b3b80d8
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