Typically, you should look for code that works with pointers (e.g. calculating pixel address directly), especially if using Pointer <-> Integer typecasts, which should be changed to PtrInt / PtrUInt instead. When accessing external APIs, make sure that pointers and other data types are not mixed (e.g. if function requests pointer, don't declare it as integer and vice-versa). Other than that, LLP64 and LP64 models are meant to simplify porting applications to 64-bit, so if you don't rely heavily on pointers, your code should supposedly work out of the box.
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