|Description:||Returns the length (in bits) of the two's complement representation of an integer.|
|Class:||Elemental function; Generic|
|Arguments:||I must be of type integer.|
|Results:||The result type is the same as I. The result value is (LOG2( I + 1 )) if I is not negative; otherwise, the result value is (LOG2( -I )).|
ILEN (4) has the value 3.
ILEN (-4) has the value 2.