• NAME
• SYNOPSIS
• F95 INTERFACE
• C INTERFACE
• PURPOSE
• ARGUMENTS

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.