integer-length

(integer-length integer)

Number of bits needed to represent the two's-complement magnitude of integer, excluding the sign. For a non-negative integer this is the position of the highest set bit plus one; for a negative integer it is the length of the ones' complement, so (integer-length -1) is 0 and (integer-length -5) is 3. On the interpreter and JVM integer may be any magnitude; on WASM it is a 31-bit i31.