Class IntegerUtil

java.lang.Object

ca.spottedleaf.common.util.IntegerUtil

public final class IntegerUtil
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
static final int	HIGH_BIT_U32
static final long	HIGH_BIT_U64

Method Summary

Modifier and Type	Method	Description
static int	branchlessAbs(int val)
static long	branchlessAbs(long val)
static int	ceilLog2(int value)
static long	ceilLog2(long value)
static int	floorLog2(int value)
static int	floorLog2(long value)
static int	getDivisorMultiple(long numbers)
static long	getDivisorNumbers(int d)
static int	getDivisorShift(long numbers)
static int	getIntMask(int bits)
static long	getLongMask(int bits)
static int	getTrailingBit(int n)
static long	getTrailingBit(long n)
static long	getUnsignedDivisorMagic(long divisor, int bits)	Usage:
static boolean	isPowerOfTwo(int n)
static boolean	isPowerOfTwo(long n)
static long	longValueExact(Number x)	Returns the long value of the number, without discarding any fractional portion of the number.
static int	roundCeilLog2(int value)
static long	roundCeilLog2(long value)
static int	roundFloorLog2(int value)
static long	roundFloorLog2(long value)
static int	trailingZeros(int n)
static int	trailingZeros(long n)

Methods inherited from class Object

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

Field Details

HIGH_BIT_U32

public static final int HIGH_BIT_U32

See Also:

• Constant Field Values

HIGH_BIT_U64

public static final long HIGH_BIT_U64

See Also:

• Constant Field Values

Method Details

ceilLog2

public static int ceilLog2(int value)

ceilLog2

public static long ceilLog2(long value)

floorLog2

public static int floorLog2(int value)

floorLog2

public static int floorLog2(long value)

roundCeilLog2

public static int roundCeilLog2(int value)

roundCeilLog2

public static long roundCeilLog2(long value)

roundFloorLog2

public static int roundFloorLog2(int value)

roundFloorLog2

public static long roundFloorLog2(long value)

isPowerOfTwo

public static boolean isPowerOfTwo(int n)

isPowerOfTwo

public static boolean isPowerOfTwo(long n)

getTrailingBit

public static int getTrailingBit(int n)

getTrailingBit

public static long getTrailingBit(long n)

trailingZeros

public static int trailingZeros(int n)

trailingZeros

public static int trailingZeros(long n)

getDivisorMultiple

public static int getDivisorMultiple(long numbers)

getDivisorShift

public static int getDivisorShift(long numbers)

getDivisorNumbers

public static long getDivisorNumbers(int d)

branchlessAbs

public static int branchlessAbs(int val)

branchlessAbs

public static long branchlessAbs(long val)

getUnsignedDivisorMagic

public static long getUnsignedDivisorMagic(long divisor,
 int bits)

Usage:

    static final long mult = getSimpleMultiplier(divisor, bits);
    long x = ...;
    long magic = x * mult;
    long divQ = magic >>> bits;
    long divR = ((magic & ((1L << bits) - 1L)) * divisor) >>> bits;

Parameters:

bits - The number of bits of precision for the returned result.

getLongMask

public static long getLongMask(int bits)

getIntMask

public static int getIntMask(int bits)

longValueExact

public static long longValueExact(Number x)

Returns the long value of the number, without discarding any fractional portion of the number.

Parameters:

x - The number

Returns:

The integer portion of the number

Throws:

ArithmeticException - If the number cannot be represented as a long