Package org.apfloat.aparapi

Class IntAparapiMatrixStrategy

java.lang.Object

org.apfloat.aparapi.IntAparapiMatrixStrategy

All Implemented Interfaces:

MatrixStrategy

public class IntAparapiMatrixStrategy
extends Object
implements MatrixStrategy

Matrix transposition in the GPU for the int type.

Since:

1.8.3

Version:

1.8.3

Author:

Mikko Tommila

Constructor Summary

Constructors

Constructor	Description
IntAparapiMatrixStrategy()	Default constructor.

Method Summary

Modifier and Type	Method	Description
void	permuteToDoubleWidth(ArrayAccess arrayAccess, int n1, int n2)	Permute the rows of the n1 x n2 matrix so that it is shaped like a n1/2 x 2*n2 matrix.
void	permuteToHalfWidth(ArrayAccess arrayAccess, int n1, int n2)	Permute the rows of the n1 x n2 matrix so that it is shaped like a 2*n1 x n2/2 matrix.
void	transpose(ArrayAccess arrayAccess, int n1, int n2)	Transpose a n1 x n2 matrix.
void	transposeSquare(ArrayAccess arrayAccess, int n1, int n2)	Transpose a square n1 x n1 block of n1 x n2 matrix.

Methods inherited from class java.lang.Object

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

Constructor Details

IntAparapiMatrixStrategy

public IntAparapiMatrixStrategy()

Default constructor.

Method Details

transpose

public void transpose(ArrayAccess arrayAccess,
 int n1,
 int n2)
               throws ApfloatRuntimeException

Description copied from interface: MatrixStrategy

Transpose a n₁ x n₂ matrix.

Both n₁ and n₂ must be powers of two. Additionally, one of these must be true:

n₁ = n₂
n₁ = 2*n₂
n₂ = 2*n₁

Specified by:

transpose in interface MatrixStrategy

Parameters:

arrayAccess - Accessor to the matrix data. This data will be transposed.

n1 - Number of rows in the matrix.

n2 - Number of columns in the matrix.

Throws:

ApfloatRuntimeException

transposeSquare

public void transposeSquare(ArrayAccess arrayAccess,
 int n1,
 int n2)
                     throws ApfloatRuntimeException

Description copied from interface: MatrixStrategy

Transpose a square n₁ x n₁ block of n₁ x n₂ matrix.

Both n₁ and n₂ must be powers of two, and n₁ <= n₂.

Specified by:

transposeSquare in interface MatrixStrategy

Parameters:

arrayAccess - Accessor to the matrix data. This data will be transposed.

n1 - Number of rows and columns in the block to be transposed.

n2 - Number of columns in the matrix.

Throws:

ApfloatRuntimeException

permuteToHalfWidth

public void permuteToHalfWidth(ArrayAccess arrayAccess,
 int n1,
 int n2)
                        throws ApfloatRuntimeException

Description copied from interface: MatrixStrategy

Permute the rows of the n₁ x n₂ matrix so that it is shaped like a 2*n₁ x n₂/2 matrix. Logically, the matrix is split in half, and the right half is moved below the left half.

Both n₁ and n₂ must be powers of two. E.g. if the matrix layout is originally as follows:

Matrix before

0	1	2	3	4	5	6	7
8	9	10	11	12	13	14	15

Then after this method it is as follows:

Matrix after

0	1	2	3
8	9	10	11
4	5	6	7
12	13	14	15

Specified by:

permuteToHalfWidth in interface MatrixStrategy

Parameters:

arrayAccess - Accessor to the matrix data. This data will be permuted.

n1 - Number of rows in the matrix.

n2 - Number of columns in the matrix.

Throws:

ApfloatRuntimeException

permuteToDoubleWidth

public void permuteToDoubleWidth(ArrayAccess arrayAccess,
 int n1,
 int n2)
                          throws ApfloatRuntimeException

Description copied from interface: MatrixStrategy

Permute the rows of the n₁ x n₂ matrix so that it is shaped like a n₁/2 x 2*n₂ matrix. Logically, the matrix is split in half, and the lower half is moved to the right side of the upper half.

Both n₁ and n₂ must be powers of two, and n₁ >= 2.

E.g. if the matrix layout is originally as follows:

Matrix before

0	1	2	3
4	5	6	7
8	9	10	11
12	13	14	15

Then after this method it is as follows:

Matrix after

0	1	2	3	8	9	10	11
4	5	6	7	12	13	14	15

Specified by:

permuteToDoubleWidth in interface MatrixStrategy

Parameters:

arrayAccess - Accessor to the matrix data. This data will be permuted.

n1 - Number of rows in the matrix.

n2 - Number of columns in the matrix.

Throws:

ApfloatRuntimeException