CodeGen/SelectionDAG/LegalizeVectorTypes.cpp

2563       SmallVector<SmallVector<std::pair<unsigned, int>, 2>> Pairs;
2567         if (Pairs.empty() || Pairs.back().size() == 2)
2568           Pairs.emplace_back();
2570           Pairs.back().emplace_back(I, 0);
2574           Pairs.back().emplace_back(I, 1);
2577       if (!Pairs.empty() && Pairs.front().size() > 1) {
2584               Pairs, [SrcRegIdx](ArrayRef<std::pair<unsigned, int>> Idxs) {
2588           if (It == Pairs.end())
2594         for (ArrayRef<std::pair<unsigned, int>> Idxs : Pairs) {