dspr2 - perform the symmetric rank 2 operation A := alpha*x*y' + alpha*y*x' + A
SUBROUTINE DSPR2(UPLO, N, ALPHA, X, INCX, Y, INCY, AP) CHARACTER*1 UPLO INTEGER N, INCX, INCY DOUBLE PRECISION ALPHA DOUBLE PRECISION X(*), Y(*), AP(*) SUBROUTINE DSPR2_64(UPLO, N, ALPHA, X, INCX, Y, INCY, AP) CHARACTER*1 UPLO INTEGER*8 N, INCX, INCY DOUBLE PRECISION ALPHA DOUBLE PRECISION X(*), Y(*), AP(*) F95 INTERFACE SUBROUTINE SPR2(UPLO, N, ALPHA, X, INCX, Y, INCY, AP) CHARACTER(LEN=1) :: UPLO INTEGER :: N, INCX, INCY REAL(8) :: ALPHA REAL(8), DIMENSION(:) :: X, Y, AP SUBROUTINE SPR2_64(UPLO, N, ALPHA, X, INCX, Y, INCY, AP) CHARACTER(LEN=1) :: UPLO INTEGER(8) :: N, INCX, INCY REAL(8) :: ALPHA REAL(8), DIMENSION(:) :: X, Y, AP C INTERFACE #include <sunperf.h> void dspr2(char uplo, int n, double alpha, double *x, int incx, double *y, int incy, double *ap); void dspr2_64(char uplo, long n, double alpha, double *x, long incx, double *y, long incy, double *ap);
Oracle Solaris Studio Performance Library dspr2(3P) NAME dspr2 - perform the symmetric rank 2 operation A := alpha*x*y' + alpha*y*x' + A SYNOPSIS SUBROUTINE DSPR2(UPLO, N, ALPHA, X, INCX, Y, INCY, AP) CHARACTER*1 UPLO INTEGER N, INCX, INCY DOUBLE PRECISION ALPHA DOUBLE PRECISION X(*), Y(*), AP(*) SUBROUTINE DSPR2_64(UPLO, N, ALPHA, X, INCX, Y, INCY, AP) CHARACTER*1 UPLO INTEGER*8 N, INCX, INCY DOUBLE PRECISION ALPHA DOUBLE PRECISION X(*), Y(*), AP(*) F95 INTERFACE SUBROUTINE SPR2(UPLO, N, ALPHA, X, INCX, Y, INCY, AP) CHARACTER(LEN=1) :: UPLO INTEGER :: N, INCX, INCY REAL(8) :: ALPHA REAL(8), DIMENSION(:) :: X, Y, AP SUBROUTINE SPR2_64(UPLO, N, ALPHA, X, INCX, Y, INCY, AP) CHARACTER(LEN=1) :: UPLO INTEGER(8) :: N, INCX, INCY REAL(8) :: ALPHA REAL(8), DIMENSION(:) :: X, Y, AP C INTERFACE #include <sunperf.h> void dspr2(char uplo, int n, double alpha, double *x, int incx, double *y, int incy, double *ap); void dspr2_64(char uplo, long n, double alpha, double *x, long incx, double *y, long incy, double *ap); PURPOSE dspr2 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, supplied in packed form. ARGUMENTS UPLO (input) On entry, UPLO specifies whether the upper or lower triangu- lar part of the matrix A is supplied in the packed array AP as follows: UPLO = 'U' or 'u' The upper triangular part of A is sup- plied in AP. UPLO = 'L' or 'l' The lower triangular part of A is sup- plied in AP. 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) Double precision array, dimension (1 + (n - 1)*abs(INCX)) Before entry, the incremented array X must contain the n ele- ment 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) Double precision array, dimension (1 + (n - 1)*abs(INCY)) Before entry, the incremented array Y must contain the n ele- ment vector y. Unchanged on exit. INCY (input) On entry, INCY specifies the increment for the elements of Y. INCY <> 0. Unchanged on exit. AP (input/output) Double precision array, dimension (( n*(n + 1))/2) Before entry with UPLO = 'U' or 'u', the array AP must contain the upper triangular part of the symmetric matrix packed sequen- tially, column by column, so that AP( 1 ) contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 1, 2 ) and a( 2, 2 ) respec- tively, and so on. On exit, the array AP is overwritten by the upper triangular part of the updated matrix. Before entry with UPLO = 'L' or 'l', the array AP must contain the lower triangular part of the symmetric matrix packed sequen- tially, column by column, so that AP( 1 ) contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 2, 1 ) and a( 3, 1 ) respec- tively, and so on. On exit, the array AP is overwritten by the lower triangular part of the updated matrix. 7 Nov 2015 dspr2(3P)