daxpy
daxpy - compute y := alpha * x + y
SUBROUTINE DAXPY( N, ALPHA, X, INCX, Y, INCY)
INTEGER N, INCX, INCY
DOUBLE PRECISION ALPHA
DOUBLE PRECISION X(*), Y(*)
SUBROUTINE DAXPY_64( N, ALPHA, X, INCX, Y, INCY)
INTEGER*8 N, INCX, INCY
DOUBLE PRECISION ALPHA
DOUBLE PRECISION X(*), Y(*)
SUBROUTINE AXPY( [N], ALPHA, X, [INCX], Y, [INCY])
INTEGER :: N, INCX, INCY
REAL(8) :: ALPHA
REAL(8), DIMENSION(:) :: X, Y
SUBROUTINE AXPY_64( [N], ALPHA, X, [INCX], Y, [INCY])
INTEGER(8) :: N, INCX, INCY
REAL(8) :: ALPHA
REAL(8), DIMENSION(:) :: X, Y
#include <sunperf.h>
void daxpy(int n, double alpha, double *x, int incx, double *y, int incy);
void daxpy_64(long n, double alpha, double *x, long incx, double *y, long incy);
daxpy compute y := alpha * x + y
where alpha is a scalar and x and y are n-vectors.
-
* N (input)
-
On entry, N specifies the number of elements in the vector. N must be at least one for the subroutine to have any visible effect. 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
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/output)
-
( 1 + ( m - 1 )*abs( INCY ) ).
On entry, the incremented array Y
must contain the vector y. On exit, Y is overwritten by the
updated vector y.
-
* INCY (input)
-
On entry, INCY specifies the increment for the elements of
Y. INCY must not be zero.
Unchanged on exit.