DOF_ID_DIFIREG
h.dofh_ident[DOF_ID_DIFIREG]);
dof->dofh_ident[DOF_ID_DIFIREG] = DIF_DIR_NREGS;
hp->dofh_ident[DOF_ID_DIFIREG] = dtp->dt_conf.dtc_difintregs;
dof->dofh_ident[DOF_ID_DIFIREG] = DIF_DIR_NREGS;
if (dof->dofh_ident[DOF_ID_DIFIREG] > DIF_DIR_NREGS) {