[llvm-dev] Function with multi return path?

[TONGARI J via llvm-dev]

Hi Reid,

I'm aware of the invoke instruction and landingpad. But it's too heavy
weight for control flow. It's quite expensive to take the exceptional path
in C++.

What I want is a more lightweight approach, to pass the return address to
the callee, and let the callee jump to that address directly.
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