[Bug c++/97553] [missed optimization] constexprness not noticed when UBsan enabled

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97553

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Depends on what you mean by properly.  -O3 can be used with sanitization, but
expecting the code to be optimized the same way as without sanitization is
wrong, it is more important to catch as many bugs as possible, and the runtime
instrumentation slows things down anyway.  The sanitization is not meant to be
used for production code, only when debugging it.