https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56183 Bug 56183 depends on bug 52278, which changed state.
Bug 52278 Summary: [4.8/4.9/5 Regression] [avr] inefficient register allocation for SUBREGs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52278 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |WORKSFORME