https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64043
--- Comment #17 from Jan Hubicka <hubicka at gcc dot gnu.org> --- Unforutnately it is a bit difficult without Haswell machine. Would be possible to profile it and post the difference in internal loops? Possibly the target option node is not streamed fully and some flags are getting lost, though I do not see how that can happen...