ssymm(3P) Sun Performance Library ssymm(3P)NAMEssymm - perform one of the matrix-matrix operations C := alpha*A*B +
beta*C or C := alpha*B*A + beta*C
SYNOPSIS
SUBROUTINE SSYMM(SIDE, UPLO, M, N, ALPHA, A, LDA, B, LDB, BETA, C,
LDC)
CHARACTER * 1 SIDE, UPLO
INTEGER M, N, LDA, LDB, LDC
REAL ALPHA, BETA
REAL A(LDA,*), B(LDB,*), C(LDC,*)
SUBROUTINE SSYMM_64(SIDE, UPLO, M, N, ALPHA, A, LDA, B, LDB, BETA, C,
LDC)
CHARACTER * 1 SIDE, UPLO
INTEGER*8 M, N, LDA, LDB, LDC
REAL ALPHA, BETA
REAL A(LDA,*), B(LDB,*), C(LDC,*)
F95 INTERFACE
SUBROUTINE SYMM(SIDE, UPLO, [M], [N], ALPHA, A, [LDA], B, [LDB],
BETA, C, [LDC])
CHARACTER(LEN=1) :: SIDE, UPLO
INTEGER :: M, N, LDA, LDB, LDC
REAL :: ALPHA, BETA
REAL, DIMENSION(:,:) :: A, B, C
SUBROUTINE SYMM_64(SIDE, UPLO, [M], [N], ALPHA, A, [LDA], B, [LDB],
BETA, C, [LDC])
CHARACTER(LEN=1) :: SIDE, UPLO
INTEGER(8) :: M, N, LDA, LDB, LDC
REAL :: ALPHA, BETA
REAL, DIMENSION(:,:) :: A, B, C
C INTERFACE
#include <sunperf.h>
void ssymm(char side, char uplo, int m, int n, float alpha, float *a,
int lda, float *b, int ldb, float beta, float *c, int ldc);
void ssymm_64(char side, char uplo, long m, long n, float alpha, float
*a, long lda, float *b, long ldb, float beta, float *c, long
ldc);
PURPOSEssymm performs one of the matrix-matrix operations C := alpha*A*B +
beta*C or C := alpha*B*A + beta*C where alpha and beta are scalars, A
is a symmetric matrix and B and C are m by n matrices.
ARGUMENTS
SIDE (input)
On entry, SIDE specifies whether the symmetric matrix A
appears on the left or right in the operation as follows:
SIDE = 'L' or 'l' C := alpha*A*B + beta*C,
SIDE = 'R' or 'r' C := alpha*B*A + beta*C,
Unchanged on exit.
UPLO (input)
On entry, UPLO specifies whether the upper or lower
triangular part of the symmetric matrix A is to be
referenced as follows:
UPLO = 'U' or 'u' Only the upper triangular part of the
symmetric matrix is to be referenced.
UPLO = 'L' or 'l' Only the lower triangular part of the
symmetric matrix is to be referenced.
Unchanged on exit.
M (input)
On entry, M specifies the number of rows of the matrix C.
M >= 0. Unchanged on exit.
N (input)
On entry, N specifies the number of columns of the matrix C.
N >= 0. 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 m when
SIDE = 'L' or 'l' and is n otherwise.
Before entry with SIDE = 'L' or 'l', the m by m part of
the array A must contain the symmetric matrix, such that
when UPLO = 'U' or 'u', the leading m by m upper triangular
part of the array A must contain the upper triangular part
of the symmetric matrix and the strictly lower triangular
part of A is not referenced, and when UPLO = 'L' or 'l',
the leading m by m lower triangular part of the array A
must contain the lower triangular part of the symmetric
matrix and the strictly upper triangular part of A is not
referenced.
Before entry with SIDE = 'R' or 'r', the n by n part of
the array A must contain the symmetric matrix, such that
when UPLO = 'U' or 'u', the leading n by n upper triangular
part of the array A must contain the upper triangular part
of the symmetric matrix and the strictly lower triangular
part of A is not referenced, and when UPLO = 'L' or 'l',
the leading n by n lower triangular part of the array A
must contain the lower triangular part of the symmetric
matrix and the strictly upper triangular part of A is not
referenced.
Unchanged on exit.
LDA (input)
On entry, LDA specifies the first dimension of A as declared
in the calling (sub) program. When SIDE = 'L' or 'l' then
LDA >= max( 1, m ), otherwise LDA >= max( 1, n ). Unchanged
on exit.
B (input)
REAL array of DIMENSION ( LDB, n ). Before entry, the lead‐
ing 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. LDB >= max( 1, m ).
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 updated matrix.
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 ssymm(3P)
