https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67153
--- Comment #19 from Andrew Pinski <pinskia at gcc dot gnu.org> --- bitset<> version real 0m1.073s user 0m1.052s sys 0m0.021s unsigned int real 0m0.903s user 0m0.883s sys 0m0.019s bitset with container adapter: real 0m1.519s user 0m1.499s sys 0m0.019s