http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59835
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Ah, with -O2 -mavx512f -march=k8 it actually hangs. So the short testcase is enough to reproduce it.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59835
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Ah, with -O2 -mavx512f -march=k8 it actually hangs. So the short testcase is enough to reproduce it.