yaxunl added a comment.

In https://reviews.llvm.org/D35438#810234, @rjmccall wrote:

> Hmm.  It doesn't seem unreasonable for this to require an insertion point as 
> a precondition.  In what situation do we emit addrspace casts after a return?


When the alloca address space is not zero and we declare an automatic variable 
after return.  Since we need to cast the automatic variable to default address 
space, we need to have a new basic block.


https://reviews.llvm.org/D35438



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