mpbits.f90 File Reference

Bit field counters. More...

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Data Types
module	mpbits
	Bit field data. More...
Functions/Subroutines
subroutine	inbits (im, jm, inc)
	Fill bit fields (counters).
subroutine	clbits (in, idimb, iencdb, jbfw)
	Calculate bit (field) array size, encoding.
subroutine	ndbits (ndims, ncmprs, nsparr, mnpair, ihst, jcmprs)
	Analyze bit fields.
subroutine	ckbits (ndims, mnpair, jcmprs)
	Check sparsity of matrix.
subroutine	spbits (nsparr, nsparc, ncmprs)
	Create sparsity information.

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Detailed Description

Bit field counters.

Count pairs of global parameters for sparse storage of global matrix, apply pair entries cut and build (compressed) sparsity structure (row offsets, column lists).

In sparse storage mode for each row the list of column indices with non zero elements (and those elements) are stored. With compression this list is represented by the first column and their number for continous regions (encoded in single 32bit words). Rare elements may be stored in single precision.

Definition in file mpbits.f90.

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Function/Subroutine Documentation

subroutine ckbits	(	INTEGER(KIND=large), dimension(4), intent(out)	ndims,
		INTEGER, intent(in)	mnpair,
		INTEGER, intent(in)	jcmprs
	)

Check sparsity of matrix.

Parameters:

[out]	ndims	(1): (reduced) size of bit array; (2): size of column lists; (3/4): number of (double/single precision) off diagonal elements;
[in]	mnpair	min. entries for pair
[in]	jcmprs	<>0: compress row information (column indices)

Definition at line 395 of file mpbits.f90.

Referenced by loop2().

subroutine clbits	(	INTEGER, intent(in)	in,
		INTEGER(KIND=large), intent(out)	idimb,
		INTEGER, intent(out)	iencdb,
		INTEGER, intent(in)	jbfw
	)

Calculate bit (field) array size, encoding.

Parameters:

[in]	in	matrix size
[out]	idimb	dimension for bit (field) array
[out]	iencdb	number of bits for encoding column counter
[in]	jbfw	bit field width

Definition at line 112 of file mpbits.f90.

Referenced by loop2().

subroutine inbits	(	INTEGER, intent(in)	im,
		INTEGER, intent(in)	jm,
		INTEGER, intent(in)	inc
	)

Fill bit fields (counters).

Parameters:

[in]	im	first index
[in]	jm	second index
[in]	inc	increment (usually 1)

Definition at line 35 of file mpbits.f90.

Referenced by loop2().

subroutine ndbits	(	INTEGER(KIND=large), dimension(4), intent(out)	ndims,
		INTEGER, dimension(:), intent(out)	ncmprs,
		INTEGER(KIND=large), dimension(:,:), intent(out)	nsparr,
		INTEGER, intent(in)	mnpair,
		INTEGER, intent(in)	ihst,
		INTEGER, intent(in)	jcmprs
	)

Analyze bit fields.

Parameters:

[out]	ndims	(1): (reduced) size of bit array; (2): size of column lists; (3/4): number of (double/single precision) off diagonal elements;
[out]	ncmprs	compression info (per row)
[out]	nsparr	row offsets
[in]	mnpair	min. entries for pair
[in]	ihst	>0: histogram number
[in]	jcmprs	<>0: compress row information (column indices)

Definition at line 167 of file mpbits.f90.

Referenced by loop2().

subroutine spbits	(	INTEGER(KIND=large), dimension(:,:), intent(in)	nsparr,
		INTEGER, dimension(:), intent(out)	nsparc,
		INTEGER, dimension(:), intent(in)	ncmprs
	)

Create sparsity information.

Parameters:

[in]	nsparr	row offsets
[out]	nsparc	column indices
[in]	ncmprs	compression info (per row)

Definition at line 494 of file mpbits.f90.

Referenced by loop2().