https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85316 Bug 85316 depends on bug 85375, which changed state.
Bug 85375 Summary: possible missed optimisation / regression from 6.3 with while (__builtin_ffs(x) && x) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85375 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED