Package org.apache.lucene.internal.hppc

Class BitMixer

java.lang.Object

org.apache.lucene.internal.hppc.BitMixer

public final class BitMixer
extends Object

Bit mixing utilities. The purpose of these methods is to evenly distribute key space over int32 range.

Forked from com.carrotsearch.hppc.BitMixer

github: https://github.com/carrotsearch/hppc release: 0.10.0

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

Constructor Summary

Constructors

Constructor	Description
BitMixer()

Method Summary

Modifier and Type	Method	Description
static int	mix(byte key)
static int	mix(char key)
static int	mix(double key)
static int	mix(float key)
static int	mix(int key)
static int	mix(long key)
static int	mix(short key)
static int	mix(Object key)
static int	mix32(int k)	MH3's plain finalization step.
static long	mix64(long z)	Computes David Stafford variant 9 of 64bit mix function (MH3 finalization step, with different shifts and constants).
static int	mixPhi(byte k)
static int	mixPhi(char k)
static int	mixPhi(double k)
static int	mixPhi(float k)
static int	mixPhi(int k)
static int	mixPhi(long k)
static int	mixPhi(short k)
static int	mixPhi(Object k)

Methods inherited from class java.lang.Object

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

Constructor Detail

BitMixer

public BitMixer()

Method Detail

mix

public static int mix(byte key)

mix

public static int mix(short key)

mix

public static int mix(char key)

mix

public static int mix(int key)

mix

public static int mix(float key)

mix

public static int mix(double key)

mix

public static int mix(long key)

mix

public static int mix(Object key)

mix32

public static int mix32(int k)

MH3's plain finalization step.

mix64

public static long mix64(long z)

Computes David Stafford variant 9 of 64bit mix function (MH3 finalization step, with different shifts and constants).

Variant 9 is picked because it contains two 32-bit shifts which could be possibly optimized into better machine code.

See Also:

"http://zimbry.blogspot.com/2011/09/better-bit-mixing-improving-on.html"

mixPhi

public static int mixPhi(byte k)

mixPhi

public static int mixPhi(char k)

mixPhi

public static int mixPhi(short k)

mixPhi

public static int mixPhi(int k)

mixPhi

public static int mixPhi(float k)

mixPhi

public static int mixPhi(double k)

mixPhi

public static int mixPhi(long k)

mixPhi

public static int mixPhi(Object k)