Contents
dgemm - perform one of the matrix-matrix operations C :=
alpha*op( A )*op( B ) + beta*C
SUBROUTINE DGEMM(TRANSA, TRANSB, M, N, K, ALPHA, A, LDA, B, LDB,
BETA, C, LDC)
CHARACTER * 1 TRANSA, TRANSB
INTEGER M, N, K, LDA, LDB, LDC
DOUBLE PRECISION ALPHA, BETA
DOUBLE PRECISION A(LDA,*), B(LDB,*), C(LDC,*)
SUBROUTINE DGEMM_64(TRANSA, TRANSB, M, N, K, ALPHA, A, LDA, B, LDB,
BETA, C, LDC)
CHARACTER * 1 TRANSA, TRANSB
INTEGER*8 M, N, K, LDA, LDB, LDC
DOUBLE PRECISION ALPHA, BETA
DOUBLE PRECISION A(LDA,*), B(LDB,*), C(LDC,*)
F95 INTERFACE
SUBROUTINE GEMM([TRANSA], [TRANSB], [M], [N], [K], ALPHA, A, [LDA],
B, [LDB], BETA, C, [LDC])
CHARACTER(LEN=1) :: TRANSA, TRANSB
INTEGER :: M, N, K, LDA, LDB, LDC
REAL(8) :: ALPHA, BETA
REAL(8), DIMENSION(:,:) :: A, B, C
SUBROUTINE GEMM_64([TRANSA], [TRANSB], [M], [N], [K], ALPHA, A, [LDA],
B, [LDB], BETA, C, [LDC])
CHARACTER(LEN=1) :: TRANSA, TRANSB
INTEGER(8) :: M, N, K, LDA, LDB, LDC
REAL(8) :: ALPHA, BETA
REAL(8), DIMENSION(:,:) :: A, B, C
C INTERFACE
#include <sunperf.h>
void dgemm(char transa, char transb, int m, int n, int k,
double alpha, double *a, int lda, double *b, int
ldb, double beta, double *c, int ldc);
void dgemm_64(char transa, char transb, long m, long n, long
k, double alpha, double *a, long lda, double *b,
long ldb, double beta, double *c, long ldc);
dgemm performs one of the matrix-matrix operations C :=
alpha*op( A )*op( B ) + beta*C where op( X ) is one of
op( X ) = X or op( X ) = X',
alpha and beta are scalars, and A, B and C are matrices,
with op( A ) an m by k matrix, op( B ) a k by n matrix
and C an m by n matrix.
TRANSA (input)
On entry, TRANSA specifies the form of op( A ) to
be used in the matrix multiplication as follows:
TRANSA = 'N' or 'n', op( A ) = A.
TRANSA = 'T' or 't', op( A ) = A'.
TRANSA = 'C' or 'c', op( A ) = A'.
Unchanged on exit.
TRANSA is defaulted to 'N' for F95 INTERFACE.
TRANSB (input)
On entry, TRANSB specifies the form of op( B ) to
be used in the matrix multiplication as follows:
TRANSB = 'N' or 'n', op( B ) = B.
TRANSB = 'T' or 't', op( B ) = B'.
TRANSB = 'C' or 'c', op( B ) = B'.
Unchanged on exit.
TRANSB is defaulted to 'N' for F95 INTERFACE.
M (input)
On entry, M specifies the number of rows of
the matrix op( A ) and of the matrix C. M
must be at least zero. Unchanged on exit.
N (input)
On entry, N specifies the number of columns of
the matrix op( B ) and the number of columns of
the matrix C. N must be at least zero. Unchanged
on exit.
K (input)
On entry, K specifies the number of columns of
the matrix op( A ) and the number of rows of the
matrix op( B ). K must be at least zero.
Unchanged on exit.
ALPHA (input)
On entry, ALPHA specifies the scalar alpha.
Unchanged on exit.
A (input)
DOUBLE PRECISION array of DIMENSION ( LDA, ka ),
where ka is k when TRANSA = 'N' or 'n', and is
m otherwise. Before entry with TRANSA = 'N' or
'n', the leading m by k part of the array A
must contain the matrix A, otherwise the leading
k by m part of the array A must contain the
matrix A. Unchanged on exit.
LDA (input)
On entry, LDA specifies the first dimension of A
as declared in the calling (sub) program. When
TRANSA = 'N' or 'n' then LDA >= max( 1, m ), oth-
erwise LDA >= max( 1, k ). Unchanged on exit.
B (input)
DOUBLE PRECISION array of DIMENSION ( LDB, kb ),
where kb is n when TRANSB = 'N' or 'n', and is
k otherwise. Before entry with TRANSB = 'N' or
'n', the leading k by n part of the array B
must contain the matrix B, otherwise the leading
n by k 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. When
TRANSB = 'N' or 'n' then LDB >= max( 1, k ), oth-
erwise LDB >= max( 1, n ). Unchanged on exit.
BETA (input)
On entry, BETA specifies the scalar beta. When
BETA is supplied as zero then C need not be set
on input. Unchanged on exit.
C (input/output)
DOUBLE PRECISION array of DIMENSION ( LDC, n ).
Before entry, the leading m by n part of the
array C must contain the matrix C, except when
beta is zero, in which case C need not be set on
entry. On exit, the array C is overwritten by
the m by n matrix ( alpha*op( A )*op( B ) +
beta*C ).
LDC (input)
On entry, LDC specifies the first dimension of C
as declared in the calling (sub) program. LDC
>= max( 1, m ). Unchanged on exit.