}
};
+// Provide a FoldingSetTrait::Equals specialization for MDNode that can use a
+// shortcut to avoid comparing all operands.
+template<> struct FoldingSetTrait<MDNode> : DefaultFoldingSetTrait<MDNode> {
+ static bool Equals(const MDNode &X, const FoldingSetNodeID &ID,
+ unsigned IDHash, FoldingSetNodeID &TempID) {
+ assert(!X.isNotUniqued() && "Non-uniqued MDNode in FoldingSet?");
+ // First, check if the cached hashes match. If they don't we can skip the
+ // expensive operand walk.
+ if (X.Hash != IDHash)
+ return false;
+
+ // If they match we have to compare the operands.
+ X.Profile(TempID);
+ return TempID == ID;
+ }
+ static unsigned ComputeHash(const MDNode &X, FoldingSetNodeID &) {
+ return X.Hash; // Return cached hash.
+ }
+};
+
/// DebugRecVH - This is a CallbackVH used to keep the Scope -> index maps
/// up to date as MDNodes mutate. This class is implemented in DebugLoc.cpp.
class DebugRecVH : public CallbackVH {
DenseMapAPFloatKeyInfo> FPMapTy;
FPMapTy FPConstants;
- StringMap<MDString*> MDStringCache;
+ StringMap<Value*> MDStringCache;
FoldingSet<MDNode> MDNodeSet;
// MDNodes may be uniqued or not uniqued. When they're not uniqued, they