https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80211
--- Comment #1 from Vladimir Makarov <vmakarov at gcc dot gnu.org> --- I can not reproduce it. With the mentioned options I have warning: implicit declaration of function '__builtin_dfp_dtstsfi_ov'; did you mean '__builtin_fpclassify`? The option set has no sense for me too. -mpower9-dform-vector implements new load insns for power9 but -mcpu=401 sets up an ancient ppc architecture. They are exclusive options. Even if the bug is reproducable, the PR should be marked as P4, IMHO.