search for: emptykey

...ed a DoubleKey struct similar to CallValue but with two Value * > member, However I have problem to implement getTombstoneKey() because I > don’t know what it is, could anyone tell me what it is about? The tombstone is simply a key value that 1. cannot occur as a key in the map (inserting EmptyKey or TombstoneKey will trigger an assertion) 2. does not compare equal to any other value We usually use something like ~0 for the empty key and ~1 for tombstones. See DenseMapInfo.h for some examples. For the data structure background: DenseMap is a quadratically probed hash map so when a collis...

Hi, All: I am trying to extend EarlyCSE.cpp to do more commoning of GEP instruction, it requires a hashtable with two keys, I defined typedef ScopedHashTable<DoubleKey, std::pair<Value *, unsigned>, DenseMapInfo<Value *>, LoadMapAllocator> LoadHTType; I declared a DoubleKey struct similar to CallValue but with two Value * member, However I