dqdota

NAME

dqdota - compute a double precision constant plus an extended precision constant plus the extended precision dot product of two double precision vectors x and y.

SYNOPSIS

  DOUBLE PRECISION FUNCTION DQDOTA( N, DB, QC, DX, INCX, DY, INCY)
  INTEGER N, INCX, INCY
  REAL * 16 QC
  DOUBLE PRECISION DB
  DOUBLE PRECISION DX(*), DY(*)
 
  DOUBLE PRECISION FUNCTION DQDOTA_64( N, DB, QC, DX, INCX, DY, INCY)
  INTEGER*8 N, INCX, INCY
  REAL * 16 QC
  DOUBLE PRECISION DB
  DOUBLE PRECISION DX(*), DY(*)

F95 INTERFACE

  REAL(8) FUNCTION DQDOTA( [N], DB, QC, DX, [INCX], DY, [INCY])
  INTEGER :: N, INCX, INCY
  REAL(16) :: QC
  REAL(8) :: DB
  REAL(8), DIMENSION(:) :: DX, DY
 
  REAL(8) FUNCTION DQDOTA_64( [N], DB, QC, DX, [INCX], DY, [INCY])
  INTEGER(8) :: N, INCX, INCY
  REAL(16) :: QC
  REAL(8) :: DB
  REAL(8), DIMENSION(:) :: DX, DY

C INTERFACE

#include <sunperf.h>

double dqdota(int n, double db, long double qc, double *dx, int incx, double *dy, int incy);

double dqdota_64(long n, double db, long double qc, double *dx, long incx, double *dy, long incy);

PURPOSE

dqdota compute a double precision constant plus an extended precision constant plus the extended precision dot product of two double precision vectors x and y.

ARGUMENTS

* N (input): On entry, N specifies the number of elements in the vector. If N <= 0 then the function returns the value DB+QC. Unchanged on exit.
* DB (input): On entry, the constant that is added to the dot product before the result is returned. Unchanged on exit.
* QC (input/output): On entry, the extended precision constant to be added to the dot product. On exit, the extended precision result.
* DX (input): On entry, the incremented array DX must contain the vector x. Unchanged on exit.
* INCX (input): On entry, INCX specifies the increment for the elements of DX. INCX must not be zero. Unchanged on exit.
* DY (input): On entry, the incremented array DY must contain the vector y. Unchanged on exit.
* INCY (input): On entry, INCY specifies the increment for the elements of DY. INCY must not be zero. Unchanged on exit.