https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71386
--- Comment #3 from Anton Mitrokhin <anton.mitrokhin at phystech dot edu> --- I see those warnings with -O3, but not with -O0. Why is that? I also do not see what is wrong with the code. Note, that clang with all warnings enabled (and ub sanitizer!) will also not produce any warnings and will generate correct code.
