Even with strict aliasing, the only way C/C++ standard effectively lets one type to be cast to another is incurring a copy. Tell me what can be done better for

Even with strict aliasing, the only way C/C++ standard effectively lets one type to be cast to another is incurring a copy. Tell me what can be done better for performance in C that can't be done in Fortran or "another static language without pointer indirection".