org.graalvm.compiler.core.common

Class NumUtil

java.lang.Object

org.graalvm.compiler.core.common.NumUtil

public class NumUtil
extends Object

A collection of static utility functions that check ranges of numbers.

Constructor Summary

Constructors

Constructor and Description
NumUtil()

Method Summary

Modifier and Type	Method and Description
static int	divideAndRoundUp(int number, int divisor)
static long	divideAndRoundUp(long number, long divisor)
static int	getNbitNumberInt(int n)
static long	getNbitNumberLong(int n)
static boolean	is32bit(long x)
static boolean	isByte(int x) Determines if a given int value is the range of signed byte values.
static boolean	isByte(long l) Determines if a given long value is the range of signed byte values.
static boolean	isInt(long l) Determines if a given long value is the range of signed int values.
static boolean	isShiftCount(int x)
static boolean	isShort(int x) Determines if a given int value is the range of signed short values.
static boolean	isShort(long x) Determines if a given long value is the range of signed short values.
static boolean	isSignedNbit(int n, int value)
static boolean	isSignedNbit(int n, long value)
static boolean	isUByte(int x) Determines if a given int value is the range of unsigned byte values.
static boolean	isUByte(long x) Determines if a given long value is the range of unsigned byte values.
static boolean	isUInt(long x) Determines if a given long value is the range of unsigned int values.
static boolean	isUnsignedNbit(int n, int value)
static boolean	isUnsignedNbit(int n, long value)
static boolean	isUShort(int s)
static boolean	isUShort(long s)
static int	log2Ceil(int val)
static long	maxUnsigned(long a, long b)
static long	maxValue(int bits) Get the maximum value representable in a bits bit signed integer.
static long	maxValueUnsigned(int bits) Get the maximum value representable in a bits bit unsigned integer.
static long	minUnsigned(long a, long b)
static long	minValue(int bits) Get the minimum value representable in a bits bit signed integer.
static int	roundDown(int number, int mod)
static long	roundDown(long number, long mod)
static int	roundUp(int number, int mod)
static long	roundUp(long number, long mod)
static byte	safeToByte(int v)
static int	safeToInt(long v)
static short	safeToShort(int v)
static byte	safeToUByte(int v)
static boolean	sameSign(long a, long b)

Methods inherited from class java.lang.Object

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

Constructor Detail

NumUtil

public NumUtil()

Method Detail

isShiftCount

public static boolean isShiftCount(int x)

isUByte

public static boolean isUByte(int x)

Determines if a given int value is the range of unsigned byte values.

isByte

public static boolean isByte(int x)

Determines if a given int value is the range of signed byte values.

isUByte

public static boolean isUByte(long x)

Determines if a given long value is the range of unsigned byte values.

isByte

public static boolean isByte(long l)

Determines if a given long value is the range of signed byte values.

isUInt

public static boolean isUInt(long x)

Determines if a given long value is the range of unsigned int values.

isInt

public static boolean isInt(long l)

Determines if a given long value is the range of signed int values.

isShort

public static boolean isShort(int x)

Determines if a given int value is the range of signed short values.

isShort

public static boolean isShort(long x)

Determines if a given long value is the range of signed short values.

isUShort

public static boolean isUShort(int s)

isUShort

public static boolean isUShort(long s)

is32bit

public static boolean is32bit(long x)

safeToUByte

public static byte safeToUByte(int v)

safeToByte

public static byte safeToByte(int v)

safeToShort

public static short safeToShort(int v)

safeToInt

public static int safeToInt(long v)

roundUp

public static int roundUp(int number,
                          int mod)

roundUp

public static long roundUp(long number,
                           long mod)

roundDown

public static int roundDown(int number,
                            int mod)

roundDown

public static long roundDown(long number,
                             long mod)

divideAndRoundUp

public static int divideAndRoundUp(int number,
                                   int divisor)

divideAndRoundUp

public static long divideAndRoundUp(long number,
                                    long divisor)

log2Ceil

public static int log2Ceil(int val)

isUnsignedNbit

public static boolean isUnsignedNbit(int n,
                                     int value)

isUnsignedNbit

public static boolean isUnsignedNbit(int n,
                                     long value)

isSignedNbit

public static boolean isSignedNbit(int n,
                                   int value)

isSignedNbit

public static boolean isSignedNbit(int n,
                                   long value)

getNbitNumberInt

public static int getNbitNumberInt(int n)

Parameters:

n - Number of bits that should be set to 1. Must be between 0 and 32 (inclusive).

Returns:

A number with n bits set to 1.

getNbitNumberLong

public static long getNbitNumberLong(int n)

Parameters:

n - Number of bits that should be set to 1. Must be between 0 and 64 (inclusive).

Returns:

A number with n bits set to 1.

minValue

public static long minValue(int bits)

Get the minimum value representable in a bits bit signed integer.

maxValue

public static long maxValue(int bits)

Get the maximum value representable in a bits bit signed integer.

maxValueUnsigned

public static long maxValueUnsigned(int bits)

Get the maximum value representable in a bits bit unsigned integer.

maxUnsigned

public static long maxUnsigned(long a,
                               long b)

minUnsigned

public static long minUnsigned(long a,
                               long b)

sameSign

public static boolean sameSign(long a,
                               long b)