Package com.ibm.wala.util.math

Class Logs

java.lang.Object

com.ibm.wala.util.math.Logs

public class Logs
extends Object

simple utilities with logarithms

Constructor Summary

Constructors

Constructor	Description
Logs()

Method Summary

Modifier and Type	Method	Description
static int	binaryLogUp(int n)	Binary log: finds the smallest power k such that 2^k >= n
static int	binaryLogUp(long n)	Binary log: finds the smallest power k such that 2^k >= n
static boolean	isPowerOf2(int x)
static int	log2(int x)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Logs

public Logs()

Method Details

isPowerOf2

public static boolean isPowerOf2(int x)

Returns:

true iff x == 2^n for some integer n

log2

public static int log2(int x)
                throws IllegalArgumentException

Parameters:

x - where x == 2^n for some integer n

Throws:

IllegalArgumentException

binaryLogUp

public static int binaryLogUp(int n)

Binary log: finds the smallest power k such that 2^k >= n

binaryLogUp

public static int binaryLogUp(long n)

Binary log: finds the smallest power k such that 2^k >= n