https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78200
--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> --- When I compare GCC 6 (r241818) against trunk (r241997) with -Ofast -march=native (on Haswell) I get 429.mcf 9120 230 39.7 S 9120 240 38.0 * 429.mcf 9120 227 40.1 S 9120 244 37.4 S 429.mcf 9120 230 39.7 * 9120 237 38.6 S thats ~5% regression. Profiling that shows 20.89% 398295 mcf_peak.amd64- mcf_peak.amd64-m64-gcc42-nn [.] primal_bea_mpp 18.34% 349619 mcf_base.amd64- mcf_base.amd64-m64-gcc42-nn [.] primal_bea_mpp 15.45% 294258 mcf_peak.amd64- mcf_peak.amd64-m64-gcc42-nn [.] refresh_potential 13.53% 257796 mcf_base.amd64- mcf_base.amd64-m64-gcc42-nn [.] refresh_potential