checkoverflow
if (!nc && checkoverflow(val, 21, raddr, " x 4k", where, off)) {
if (checkoverflow(val, 26, raddr, " word", where, off)) {
if (checkoverflow(val, 64, raddr, "", where, off)) {
if (checkoverflow(val, 32, raddr, "", where, off)) {
if (checkoverflow(val, 16, raddr, "", where, off)) {