BIG_CHUNK_HIGHBIT
result = (result >> 1) | BIG_CHUNK_HIGHBIT;
if ((t & BIG_CHUNK_HIGHBIT) == 0) {
t1.value[t1.len - 1] = BIG_CHUNK_HIGHBIT;
bit = BIG_CHUNK_HIGHBIT;
r->value[rwords - 1] |= BIG_CHUNK_HIGHBIT;
while ((b > 1) && ((c & BIG_CHUNK_HIGHBIT) == 0)) {
((aa->value[aa->len - 1] & BIG_CHUNK_HIGHBIT) != 0)) {