https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77902
--- Comment #2 from Allan Jensen <linux at carewolf dot com> --- While this have been the case in both GCC 5 and GCC 6, it appears to both failing cases previously meantioned already produced the best case result in using a half recent GCC 7. gcc version 7.0.0 20160923 (experimental) (GCC)
