org.apfloat.internal

Class LongFactor3NTTStepStrategy

java.lang.Object

org.apfloat.internal.LongElementaryModMath

org.apfloat.internal.LongModMath

org.apfloat.internal.LongFactor3NTTStepStrategy

All Implemented Interfaces:

Parallelizable, Factor3NTTStepStrategy

public class LongFactor3NTTStepStrategy
extends LongModMath
implements Factor3NTTStepStrategy, Parallelizable

Steps for the factor-3 NTT.

The transform is done using a parallel algorithm, if the data fits in memory.

All access to this class must be externally synchronized.

Since:

1.7.0

Version:

1.8.0

Author:

Mikko Tommila

Constructor Summary

Constructors

Constructor and Description
LongFactor3NTTStepStrategy() Default constructor.

Method Summary

Modifier and Type	Method and Description
protected ParallelRunnable	createColumnTransformParallelRunnable(DataStorage dataStorage0, DataStorage dataStorage1, DataStorage dataStorage2, long startColumn, long columns, long power2length, long length, boolean isInverse, int modulus) Create a ParallelRunnable object for transforming the columns of the matrix using a 3-point NTT transform.
long	getMaxTransformLength() Get the maximum transform length.
void	transformColumns(DataStorage dataStorage0, DataStorage dataStorage1, DataStorage dataStorage2, long startColumn, long columns, long power2length, long length, boolean isInverse, int modulus) Transform the columns of a matrix using a 3-point transform.

Methods inherited from class org.apfloat.internal.LongModMath

createWTable, getForwardNthRoot, getInverseNthRoot, modDivide, modInverse, modPow, negate

Methods inherited from class org.apfloat.internal.LongElementaryModMath

getModulus, modAdd, modMultiply, modSubtract, setModulus

Methods inherited from class java.lang.Object

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

Constructor Detail

LongFactor3NTTStepStrategy

public LongFactor3NTTStepStrategy()

Default constructor.

Method Detail

transformColumns

public void transformColumns(DataStorage dataStorage0,
                             DataStorage dataStorage1,
                             DataStorage dataStorage2,
                             long startColumn,
                             long columns,
                             long power2length,
                             long length,
                             boolean isInverse,
                             int modulus)
                      throws ApfloatRuntimeException

Description copied from interface: Factor3NTTStepStrategy

Transform the columns of a matrix using a 3-point transform.

Specified by:

transformColumns in interface Factor3NTTStepStrategy

Parameters:

dataStorage0 - The data of the first column.

dataStorage1 - The data of the second column.

dataStorage2 - The data of the third column.

startColumn - The starting element index in the data storages to transform.

columns - How many columns to transform.

power2length - Length of the column transform.

length - Length of total transform (three times the length of one column).

isInverse - true if an inverse transform is performed, false if a forward transform is performed.

modulus - Index of the modulus.

Throws:

ApfloatRuntimeException

getMaxTransformLength

public long getMaxTransformLength()

Description copied from interface: Factor3NTTStepStrategy

Get the maximum transform length.

Specified by:

getMaxTransformLength in interface Factor3NTTStepStrategy

Returns:

The maximum transform length.

createColumnTransformParallelRunnable

protected ParallelRunnable createColumnTransformParallelRunnable(DataStorage dataStorage0,
                                                                 DataStorage dataStorage1,
                                                                 DataStorage dataStorage2,
                                                                 long startColumn,
                                                                 long columns,
                                                                 long power2length,
                                                                 long length,
                                                                 boolean isInverse,
                                                                 int modulus)

Create a ParallelRunnable object for transforming the columns of the matrix using a 3-point NTT transform.

Parameters:

dataStorage0 - The data of the first column.

dataStorage1 - The data of the second column.

dataStorage2 - The data of the third column.

startColumn - The starting element index in the data storages to transform.

columns - How many columns to transform.

power2length - Length of the column transform.

length - Length of total transform (three times the length of one column).

isInverse - true if an inverse transform is performed, false if a forward transform is performed.

modulus - Index of the modulus.

Returns:

A suitable object for performing the 3-point transforms in parallel.