OPENBSD_FLAG_TO_FP_C
p->p_md.md_flags &= ~OPENBSD_FLAG_TO_FP_C(FP_X_IMP);
#define SET_FP_C_FLAG(fp_c, m) (CLEAR_FP_C_FLAG(fp_c) | OPENBSD_FLAG_TO_FP_C(m))
do curproc->p_md.md_flags |= OPENBSD_FLAG_TO_FP_C(f); \