[LLVMdev] What is getTombstoneKey?

[Lawrence]

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 have problem to implement getTombstoneKey() because I
don't know what it is, could anyone tell me what it is about?

 

 

 

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