dsdot(3P) Sun Performance Library dsdot(3P)NAMEdsdot - compute the double precision dot product of two single preciā
sion vectors x and y.
SYNOPSIS
DOUBLE PRECISION FUNCTION DSDOT(N, X, INCX, Y, INCY)
INTEGER N, INCX, INCY
REAL X(*), Y(*)
DOUBLE PRECISION FUNCTION DSDOT_64(N, X, INCX, Y, INCY)
INTEGER*8 N, INCX, INCY
REAL X(*), Y(*)
F95 INTERFACE
REAL(8) FUNCTION DSDOT(N, X, INCX, Y, INCY)
INTEGER :: N, INCX, INCY
REAL, DIMENSION(:) :: X, Y
REAL(8) FUNCTION DSDOT_64(N, X, INCX, Y, INCY)
INTEGER(8) :: N, INCX, INCY
REAL, DIMENSION(:) :: X, Y
C INTERFACE
#include <sunperf.h>
double dsdot(int n, float *x, int incx, float *y, int incy);
double dsdot_64(long n, float *x, long incx, float *y, long incy);
PURPOSEdsdot compute the double precision dot product of x and y where x and y
are single precision n-vectors.
ARGUMENTS
N (input)
On entry, N specifies the number of elements in the vector.
If N is not positive then the function returns the value 0.0.
Unchanged on exit.
X (input)
( 1 + ( n - 1 )*abs( INCX ) ). On entry, the incremented
array X must contain the vector x. Unchanged on exit.
INCX (input)
On entry, INCX specifies the increment for the elements of X.
INCX must not be zero. Unchanged on exit.
Y (input)
( 1 + ( n - 1 )*abs( INCY ) ). On entry, the incremented
array Y must contain the vector y. Unchanged on exit.
INCY (input)
On entry, INCY specifies the increment for the elements of Y.
INCY must not be zero. Unchanged on exit.
6 Mar 2009 dsdot(3P)