1597 struct IVChain {  struct
1598   SmallVector<IVInc,1> Incs;
1599   const SCEV *ExprBase;
1601   IVChain() : ExprBase(nullptr) {}  in IVChain()  argument
1603   IVChain(const IVInc &Head, const SCEV *Base)  in IVChain()  function
1606   typedef SmallVectorImpl<IVInc>::const_iterator const_iterator;
1609   const_iterator begin() const {  in begin()
1613   const_iterator end() const {  in end()
1618   bool hasIncs() const { return Incs.size() >= 2; }  in hasIncs()
1621   void add(const IVInc &X) { Incs.push_back(X); }  in add()
1624   Instruction *tailUserInst() const { return Incs.back().UserInst; }  in tailUserInst()