+// Provide specialization of DenseMapInfo for PointerIntPair.
+template<typename PointerTy, unsigned IntBits, typename IntType>
+struct DenseMapInfo<PointerIntPair<PointerTy, IntBits, IntType> > {
+ typedef PointerIntPair<PointerTy, IntBits, IntType> Ty;
+ static Ty getEmptyKey() {
+ intptr_t Val = -1;
+ Val <<= PointerLikeTypeTraits<PointerTy>::NumLowBitsAvailable;
+ return Ty(reinterpret_cast<PointerTy>(Val), IntType((1 << IntBits)-1));
+ }
+ static Ty getTombstoneKey() {
+ intptr_t Val = -2;
+ Val <<= PointerLikeTypeTraits<PointerTy>::NumLowBitsAvailable;
+ return Ty(reinterpret_cast<PointerTy>(Val), IntType(0));
+ }
+ static unsigned getHashValue(Ty V) {
+ uintptr_t IV = reinterpret_cast<uintptr_t>(V.getOpaqueValue());
+ return unsigned(IV) ^ unsigned(IV >> 9);
+ }
+ static bool isEqual(const Ty &LHS, const Ty &RHS) { return LHS == RHS; }
+};
+
+// Teach SmallPtrSet that PointerIntPair is "basically a pointer".
+template<typename PointerTy, unsigned IntBits, typename IntType,
+ typename PtrTraits>
+class PointerLikeTypeTraits<PointerIntPair<PointerTy, IntBits, IntType,
+ PtrTraits> > {
+public:
+ static inline void *
+ getAsVoidPointer(const PointerIntPair<PointerTy, IntBits, IntType> &P) {
+ return P.getOpaqueValue();