Is it very hard to implement Zero-overhead deterministic exceptions: Throwing values??

[sotrdg sotrdg via Gcc]

http://open-std.org/JTC1/SC22/WG21/docs/papers/2018/p0709r0.pdf

I really want this feature. How, it looks like this requires changes on RTL, 
gimple and C++ front-end. Is that very hard to implement it?

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