sgemm(3P) Sun Performance Library sgemm(3P)NAMEsgemm - perform one of the matrix-matrix operations C := alpha*op( A
)*op( B ) + beta*C
SYNOPSIS
SUBROUTINE SGEMM(TRANSA, TRANSB, M, N, K, ALPHA, A, LDA, B, LDB,
BETA, C, LDC)
CHARACTER * 1 TRANSA, TRANSB
INTEGER M, N, K, LDA, LDB, LDC
REAL ALPHA, BETA
REAL A(LDA,*), B(LDB,*), C(LDC,*)
SUBROUTINE SGEMM_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
REAL ALPHA, BETA
REAL 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 :: ALPHA, BETA
REAL, 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 :: ALPHA, BETA
REAL, DIMENSION(:,:) :: A, B, C
C INTERFACE
#include <sunperf.h>
void sgemm(char transa, char transb, int m, int n, int k, float alpha,
float *a, int lda, float *b, int ldb, float beta, float *c,
int ldc);
void sgemm_64(char transa, char transb, long m, long n, long k, float
alpha, float *a, long lda, float *b, long ldb, float beta,
float *c, long ldc);
PURPOSEsgemm 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.
ARGUMENTS
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)
REAL 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 ), otherwise LDA >= max( 1, k ). Unchanged
on exit.
B (input)
REAL 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 ), otherwise 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)
REAL array of DIMENSION ( LDC, n ). Before entry, the lead‐
ing 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.
6 Mar 2009 sgemm(3P)
