https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116761
--- Comment #1 from Filip Kastl <pheeck at gcc dot gnu.org> --- This graph plots results of -march=x86_64v3 -Ofast -flto. https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=1119.230.0 A spike can be seen in this graph too so maybe this is a general x86_64 slowdown? However, I haven't seen this slowdown on our Intel machine. This graph plots results of -march=native -Ofast (without LTO). https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=965.230.0 There is also a spike so this slowdown probably isn't specific to lto.
