[llvm-dev] How to get return address at llvm ir level?

[PenYiWang via llvm-dev]

Hi

I want to write a FunctionPass to insert some code before return.

Funcion:
..
..
..
mov eax,[esp]
cmp eax,0x12345678
je 0x12345678
ret
(maybe stack will not balance)

I wonder that can I get the return address at llvm ir level?

I use IRBuilder to CreateICmpEQ and CreateCondBr.

but I don't how to get the value of return addrss.

I have found there is a  Intrinsic::returnaddress.

Is Intrinsic::returnaddress can help me?

I don't konw how to use Intrinsic::returnaddress because few files use this
intrinsic.

Thanks
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