Package com.ibm.wala.util.intset

Class Bits

java.lang.Object

com.ibm.wala.util.intset.Bits

public class Bits
extends Object

utilities for manipulating values at the bit-level.

Method Summary

Modifier and Type	Method	Description
static boolean	fits(int val, int bits)	Does an int literal val fit in bits bits?
static int	lower16(int value)	Return the lower 16 bits (as an int) of an int
static int	lower32(long value)	Return the lower 32 bits (as an int) of a long
static int	lower8(int value)	Return the lower 8 bits (as an int) of an int
static int	populationCount(int value)	Return the number of ones in the binary representation of an integer.
static int	upper16(int value)	Return the upper 16 bits (as an int) of an int
static int	upper24(int value)	Return the upper 24 bits (as an int) of an int
static int	upper32(long value)	Return the upper 32 bits (as an int) of a long

Methods inherited from class java.lang.Object

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

Method Details

lower8

public static int lower8(int value)

Return the lower 8 bits (as an int) of an int

lower16

public static int lower16(int value)

Return the lower 16 bits (as an int) of an int

upper16

public static int upper16(int value)

Return the upper 16 bits (as an int) of an int

upper24

public static int upper24(int value)

Return the upper 24 bits (as an int) of an int

lower32

public static int lower32(long value)

Return the lower 32 bits (as an int) of a long

upper32

public static int upper32(long value)

Return the upper 32 bits (as an int) of a long

fits

public static boolean fits(int val,
 int bits)

Does an int literal val fit in bits bits?

populationCount

public static int populationCount(int value)

Return the number of ones in the binary representation of an integer. Hank Warren's Hacker's Delight algorithm