[Bug c++/58055] [meta-bug] RVO / NRVO improvements

[marc at kdab dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58055

marc at kdab dot com changed:

           What    |Removed                     |Added
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                 CC|                            |marc at kdab dot com

--- Comment #5 from marc at kdab dot com ---
I have no clue about the architecture of GCC, but it sounds to me that NRVO is
definitely a front-end optimisation, because it's allowed to change observable
behaviour. E.g., you can elide the copy ctor and dtor even if they have side
effects. Once you go into some intermediate representation, the information
that a set of given side effects can be entirely removed is probably
irrevocably lost.