https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19794 Bug 19794 depends on bug 70879, which changed state.
Bug 70879 Summary: Missed jump threading opportunity with multiple != conditions https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70879 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED