https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61317
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- > ints[j++]=~ints[j-1] & 0xFF; It is unspecified (in both C and C++ standards) if j++ can happen either before or after the expression j-1 has been evaluated.