https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118518
--- Comment #17 from Benjamin Schulz <schulz.benjamin at googlemail dot com> --- My code in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120835 apparently provokes gcc to yield different results for the same computation with differing -O optimization levels... I do not use any kind of difficult tricks that c++ allows. just rather simple c++