FASTTRAP_EFLAGS_SF
taken = (rp->r_ps & FASTTRAP_EFLAGS_SF) != 0;
taken = (rp->r_ps & FASTTRAP_EFLAGS_SF) == 0;
taken = ((rp->r_ps & FASTTRAP_EFLAGS_SF) == 0) !=
taken = ((rp->r_ps & FASTTRAP_EFLAGS_SF) == 0) ==
((rp->r_ps & FASTTRAP_EFLAGS_SF) == 0) !=
((rp->r_ps & FASTTRAP_EFLAGS_SF) == 0) ==