https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65076
--- Comment #28 from Markus Trippelsdorf <trippels at gcc dot gnu.org> --- Yes, it is still 15% on my machine, too: markus@x4 ~ % time g++ -w -Ofast tramp3d-v4.cpp g++ -w -Ofast tramp3d-v4.cpp 25.45s user 0.33s system 99% cpu 25.832 total (At least this is still faster than clang: markus@x4 ~ % time clang++ -w -Ofast tramp3d-v4.cpp clang++ -w -Ofast tramp3d-v4.cpp 31.03s user 0.15s system 100% cpu 31.183 total)