https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77745
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Known to work| |4.5.0 Target Milestone|--- |5.5 Summary|Inconsistent application of |[5/6/7 Regression] |aliasing rules |Inconsistent application of | |aliasing rules Known to fail| |5.4.0, 7.0 --- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> --- You know what you are right this is wrong code. Note I am surprised we don't emit clobber barriers before operator new anyways to say the life time of an object just started. This will most likely solve the issue overall.