ssyr2 - perform the symmetric rank 2 operation A := alpha*x*y' + alpha*y*x' + A
SUBROUTINE SSYR2(UPLO, N, ALPHA, X, INCX, Y, INCY, A, LDA) CHARACTER*1 UPLO INTEGER N, INCX, INCY, LDA REAL ALPHA REAL X(*), Y(*), A(LDA,*) SUBROUTINE SSYR2_64(UPLO, N, ALPHA, X, INCX, Y, INCY, A, LDA) CHARACTER*1 UPLO INTEGER*8 N, INCX, INCY, LDA REAL ALPHA REAL X(*), Y(*), A(LDA,*) F95 INTERFACE SUBROUTINE SYR2(UPLO, N, ALPHA, X, INCX, Y, INCY, A, LDA) CHARACTER(LEN=1) :: UPLO INTEGER :: N, INCX, INCY, LDA REAL :: ALPHA REAL, DIMENSION(:) :: X, Y REAL, DIMENSION(:,:) :: A SUBROUTINE SYR2_64(UPLO, N, ALPHA, X, INCX, Y, INCY, A, LDA) CHARACTER(LEN=1) :: UPLO INTEGER(8) :: N, INCX, INCY, LDA REAL :: ALPHA REAL, DIMENSION(:) :: X, Y REAL, DIMENSION(:,:) :: A C INTERFACE #include <sunperf.h> void ssyr2(char uplo, int n, float alpha, float *x, int incx, float *y, int incy, float *a, int lda); void ssyr2_64(char uplo, long n, float alpha, float *x, long incx, float *y, long incy, float *a, long lda);
Oracle Solaris Studio Performance Library ssyr2(3P) NAME ssyr2 - perform the symmetric rank 2 operation A := alpha*x*y' + alpha*y*x' + A SYNOPSIS SUBROUTINE SSYR2(UPLO, N, ALPHA, X, INCX, Y, INCY, A, LDA) CHARACTER*1 UPLO INTEGER N, INCX, INCY, LDA REAL ALPHA REAL X(*), Y(*), A(LDA,*) SUBROUTINE SSYR2_64(UPLO, N, ALPHA, X, INCX, Y, INCY, A, LDA) CHARACTER*1 UPLO INTEGER*8 N, INCX, INCY, LDA REAL ALPHA REAL X(*), Y(*), A(LDA,*) F95 INTERFACE SUBROUTINE SYR2(UPLO, N, ALPHA, X, INCX, Y, INCY, A, LDA) CHARACTER(LEN=1) :: UPLO INTEGER :: N, INCX, INCY, LDA REAL :: ALPHA REAL, DIMENSION(:) :: X, Y REAL, DIMENSION(:,:) :: A SUBROUTINE SYR2_64(UPLO, N, ALPHA, X, INCX, Y, INCY, A, LDA) CHARACTER(LEN=1) :: UPLO INTEGER(8) :: N, INCX, INCY, LDA REAL :: ALPHA REAL, DIMENSION(:) :: X, Y REAL, DIMENSION(:,:) :: A C INTERFACE #include <sunperf.h> void ssyr2(char uplo, int n, float alpha, float *x, int incx, float *y, int incy, float *a, int lda); void ssyr2_64(char uplo, long n, float alpha, float *x, long incx, float *y, long incy, float *a, long lda); PURPOSE ssyr2 performs the symmetric rank 2 operation A := alpha*x*y' + alpha*y*x' + A, where alpha is a scalar, x and y are n element vectors and A is an n by n symmetric matrix. ARGUMENTS UPLO (input) On entry, UPLO specifies whether the upper or lower triangu- lar part of the array A is to be referenced as follows: UPLO = 'U' or 'u' Only the upper triangular part of A is to be referenced. UPLO = 'L' or 'l' Only the lower triangular part of A is to be referenced. Unchanged on exit. N (input) On entry, N specifies the order of the matrix A. N >= 0. Unchanged on exit. ALPHA (input) On entry, ALPHA specifies the scalar alpha. Unchanged on exit. X (input) ( 1 + ( n - 1 )*abs( INCX ) ). Before entry, the incremented array X must contain the n element vector x. Unchanged on exit. INCX (input) On entry, INCX specifies the increment for the elements of X. INCX <> 0. Unchanged on exit. Y (input) ( 1 + ( n - 1 )*abs( INCY ) ). Before entry, the incremented array Y must contain the n element vector y. Unchanged on exit. INCY (input) On entry, INCY specifies the increment for the elements of Y. INCY <> 0. Unchanged on exit. A (input/output) Before entry with 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. On exit, the upper triangular part of the array A is overwritten by the upper triangular part of the updated matrix. Before entry with 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. On exit, the lower triangular part of the array A is overwritten by the lower triangular part of the updated matrix. LDA (input) On entry, LDA specifies the first dimension of A as declared in the calling (sub) program. LDA >= max( 1, n ). Unchanged on exit. 7 Nov 2015 ssyr2(3P)