FP_C_TO_OPENBSD_FLAG
disables = FP_C_TO_OPENBSD_FLAG(fp_c) & ~FP_C_TO_OPENBSD_MASK(fp_c);
orig_flags = FP_C_TO_OPENBSD_FLAG(p->p_md.md_flags);
new_flags = FP_C_TO_OPENBSD_FLAG(md_flags);
*retval = FP_C_TO_OPENBSD_FLAG(md_flags);
*retval = FP_C_TO_OPENBSD_FLAG(p->p_md.md_flags);