djadmm(3P) Sun Performance Library djadmm(3P)NAMEdjadmm - Jagged diagonal matrix-matrix multiply (modified Ellpack)
SYNOPSIS
SUBROUTINE DJADMM( TRANSA, M, N, K, ALPHA, DESCRA,
* VAL, INDX, PNTR, MAXNZ, IPERM,
* B, LDB, BETA, C, LDC, WORK, LWORK)
INTEGER TRANSA, M, N, K, DESCRA(5), MAXNZ,
* LDB, LDC, LWORK
INTEGER INDX(NNZ), PNTR(MAXNZ+1), IPERM(M)
DOUBLE PRECISION ALPHA, BETA
DOUBLE PRECISION VAL(NNZ), B(LDB,*), C(LDC,*), WORK(LWORK)
SUBROUTINE DJADMM_64( TRANSA, M, N, K, ALPHA, DESCRA,
* VAL, INDX, PNTR, MAXNZ, IPERM,
* B, LDB, BETA, C, LDC, WORK, LWORK)
INTEGER*8 TRANSA, M, N, K, DESCRA(5), MAXNZ,
* LDB, LDC, LWORK
INTEGER*8 INDX(NNZ), PNTR(MAXNZ+1), IPERM(M)
DOUBLE PRECISION ALPHA, BETA
DOUBLE PRECISION VAL(NNZ), B(LDB,*), C(LDC,*), WORK(LWORK)
where NNZ=PNTR(MAXNZ+1)-PNTR(1)+1 is the number of non-zero elements.
F95 INTERFACE
SUBROUTINE JADMM( TRANSA, M, [N], K, ALPHA, DESCRA, VAL, INDX,
* PNTR, MAXNZ, IPERM, B, [LDB], BETA, C, [LDC], [WORK], [LWORK])
INTEGER TRANSA, M, K, MAXNZ
INTEGER, DIMENSION(:) :: DESCRA, INDX, PNTR, IPERM
DOUBLE PRECISION ALPHA, BETA
DOUBLE PRECISION, DIMENSION(:) :: VAL
DOUBLE PRECISION, DIMENSION(:, :) :: B, C
SUBROUTINE JADMM_64( TRANSA, M, [N], K, ALPHA, DESCRA, VAL, INDX,
* PNTR, MAXNZ, IPERM, B, [LDB], BETA, C, [LDC], [WORK], [LWORK])
INTEGER*8 TRANSA, M, K, MAXNZ
INTEGER*8, DIMENSION(:) :: DESCRA, INDX, PNTR, IPERM
DOUBLE PRECISION ALPHA, BETA
DOUBLE PRECISION, DIMENSION(:) :: VAL
DOUBLE PRECISION, DIMENSION(:, :) :: B, C
C INTERFACE
#include <sunperf.h>
void djadmm (const int transa, const int m, const int n, const int k,
const double alpha, const int* descra, const double* val,
const int* indx, const int* pntr, const int maxnz, const int*
iperm, const double* b, const int ldb, const double beta,
double* c, const int ldc);
void djadmm_64 (const long transa, const long m, const long n, const
long k, const double alpha, const long* descra, const double*
val, const long* indx, const long* pntr, const long maxnz,
const long* iperm, const double* b, const long ldb, const
double beta, double* c, const long ldc);
DESCRIPTIONdjadmm performs one of the matrix-matrix operations
C <- alpha op(A) B + beta C
where op( A ) is one of
op( A ) = A or op( A ) = A' or op( A ) = conjg( A' )
( ' indicates matrix transpose),
A is an M-by-K sparse matrix represented in the jagged diagonal format,
alpha and beta are scalars, C and B are dense matrices.
ARGUMENTSTRANSA(input) TRANSA specifies the form of op( A ) to be used in
the matrix multiplication as follows:
0 : operate with matrix
1 : operate with transpose matrix
2 : operate with the conjugate transpose of matrix.
2 is equivalent to 1 if matrix is real.
Unchanged on exit.
M(input) On entry, M specifies the number of rows in
the matrix A. Unchanged on exit.
N(input) On entry, N specifies the number of columns in
the matrix C. Unchanged on exit.
K(input) On entry, K specifies the number of columns
in the matrix A. Unchanged on exit.
ALPHA(input) On entry, ALPHA specifies the scalar alpha. Unchanged on exit.
DESCRA (input) Descriptor argument. Five element integer array.
DESCRA(1) matrix structure
0 : general
1 : symmetric (A=A')
2 : Hermitian (A= CONJG(A'))
3 : Triangular
4 : Skew(Anti)-Symmetric (A=-A')
5 : Diagonal
6 : Skew-Hermitian (A= -CONJG(A'))
DESCRA(2) upper/lower triangular indicator
1 : lower
2 : upper
DESCRA(3) main diagonal type
0 : non-unit
1 : unit
DESCRA(4) Array base (NOT IMPLEMENTED)
0 : C/C++ compatible
1 : Fortran compatible
DESCRA(5) repeated indices? (NOT IMPLEMENTED)
0 : unknown
1 : no repeated indices
VAL(input) On entry, VAL is a scalar array of length
NNZ=PNTR(MAXNZ+1)-PNTR(1)+1 consisting of entries of A.
VAL can be viewed as a column major ordering of a
row permutation of the Ellpack representation of A,
where the Ellpack representation is permuted so that
the rows are non-increasing in the number of nonzero
entries. Values added for padding in Ellpack are
not included in the Jagged-Diagonal format.
Unchanged on exit.
INDX(input) On entry, INDX is an integer array of length
NNZ=PNTR(MAXNZ+1)-PNTR(1)+1 consisting of the column
indices of the corresponding entries in VAL.
Unchanged on exit.
PNTR(input) On entry, PNTR is an integer array of length
MAXNZ+1, where PNTR(I)-PNTR(1)+1 points to
the location in VAL of the first element
in the row-permuted Ellpack represenation of A.
Unchanged on exit.
MAXNZ(input) On entry, MAXNZ specifies the max number of
nonzeros elements per row. Unchanged on exit.
IPERM(input) On entry, IPERM is an integer array of length M
such that I = IPERM(I'), where row I in the
original Ellpack representation corresponds
to row I' in the permuted representation.
If IPERM(1) = 0, it is assumed by convention that
IPERM(I) = I. IPERM is used to determine the order
in which rows of C are updated. Unchanged on exit.
B (input) Array of DIMENSION ( LDB, N ).
Before entry with TRANSA = 0, the leading k by n
part of the array B must contain the matrix B, otherwise
the leading m by n part of the array B must contain the
matrix B. Unchanged on exit.
LDB (input) On entry, LDB specifies the first dimension of B as declared
in the calling (sub) program. Unchanged on exit.
BETA (input) On entry, BETA specifies the scalar beta. Unchanged on exit.
C(input/output) Array of DIMENSION ( LDC, N ).
Before entry with TRANSA = 0, the leading m by n
part of the array C must contain the matrix C, otherwise
the leading k by n part of the array C must contain the
matrix C. On exit, the array C is overwritten by the matrix
( alpha*op( A )* B + beta*C ).
LDC (input) On entry, LDC specifies the first dimension of C as declared
in the calling (sub) program. Unchanged on exit.
WORK (is not referenced in the current version)
LWORK (is not referenced in the current version)
SEE ALSO
Libsunperf SPARSE BLAS is fully parallel and compatible with NIST FOR‐
TRAN Sparse Blas but the sources are different. Libsunperf SPARSE BLAS
is free of bugs found in NIST FORTRAN Sparse Blas. Besides several new
features and routines are implemented.
NIST FORTRAN Sparse Blas User's Guide available at:
http://math.nist.gov/mcsd/Staff/KRemington/fspblas/
Based on the standard proposed in
"Document for the Basic Linear Algebra Subprograms (BLAS) Standard",
University of Tennessee, Knoxville, Tennessee, 1996:
http://www.netlib.org/utk/papers/sparse.ps
3rd Berkeley Distribution 6 Mar 2009 djadmm(3P)
