/**
* Return the index of the lowest set bit in this MutableBigInteger. If the magnitude of this
* MutableBigInteger is zero, -1 is returned.
*/
private final int getLowestSetBit() {
if (intLen == 0) return -1;
int j, b;
for (j = intLen - 1; (j > 0) && (value[j + offset] == 0); j--) ;
b = value[j + offset];
if (b == 0) return -1;
return ((intLen - 1 - j) << 5) + BigInteger.trailingZeroCnt(b);
}
