[Bug c++/116459] gcc 12.2.0 optimized out functions which has observable side affect

[xiaohuba2021 at 163 dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116459

--- Comment #7 from xiaohuba2021 <xiaohuba2021 at 163 dot com> ---
Created attachment 58975
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58975&action=edit
The miscompiled program