Chuanqi Xu d30ca5e2e2 [C++20] [Coroutines] Implement return value optimization for get_return_object ...

This patch tries to implement RVO for coroutine's return object got from
get_return_object.
From [dcl.fct.def.coroutine]/p7 we could know that the return value of
get_return_object is either a reference or a prvalue. So it makes sense
to do copy elision for the return value. The return object should be
constructed directly into the storage where they would otherwise be
copied/moved to.

Test Plan: folly, check-all

Reviewed By: junparser

Differential revision: https://reviews.llvm.org/D117087

2022-02-16 13:38:00 +08:00

27 KiB

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