From http://llvm.org/docs/CodingStandards.html#ci_rtti_exceptions

LLVM does make extensive use of a hand-rolled form of RTTI that use templates like isa<>, cast<>, and dyn_cast<>. This form of RTTI is opt-in and can be added to any class. It is also substantially more efficient than dynamic_cast<>.

How is isa and the others implemented?

c++ llvm
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