https://gcc.gnu.org/bugzilla/show_bug.cgi?id=16996 Bug 16996 depends on bug 11180, which changed state.
Bug 11180 Summary: [avr-gcc] Optimization decrease performance of struct assignment. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=11180 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED