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

[redi at gcc dot gnu.org via Gcc-bugs]

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

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to xiaohuba2021 from comment #0)
> struct Matrix {
>     long long mat[2][2];
>     Matrix() { memset(mat, 0, sizeof(mat)); }

N.B. there's no miscompilation if you change this to the more idiomatic and
sensible:

     Matrix() : mat() { }