subroutine sla_wwaddw	(	integer	N,
		real, dimension( * )	X,
		real, dimension( * )	Y,
		real, dimension( * )	W
	)

SLA_WWADDW adds a vector into a doubled-single vector.

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Purpose:

    SLA_WWADDW adds a vector W into a doubled-single vector (X, Y).

    This works for all extant IBM's hex and binary floating point
    arithmetics, but not for decimal.

Parameters

[in]	N	N is INTEGER The length of vectors X, Y, and W.
[in,out]	X	X is REAL array, dimension (N) The first part of the doubled-single accumulation vector.
[in,out]	Y	Y is REAL array, dimension (N) The second part of the doubled-single accumulation vector.
[in]	W	W is REAL array, dimension (N) The vector to be added.

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date

September 2012

Definition at line 83 of file sla_wwaddw.f.

*
*  -- LAPACK computational routine (version 3.4.2) --
*  -- LAPACK is a software package provided by Univ. of Tennessee,    --
*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
*     September 2012
*
*     .. Scalar Arguments ..
      INTEGER            n
*     ..
*     .. Array Arguments ..
      REAL               x( * ), y( * ), w( * )
*     ..
*
*  =====================================================================
*
*     .. Local Scalars ..
      REAL               s
      INTEGER            i
*     ..
*     .. Executable Statements ..
*
      DO 10 i = 1, n
        s = x(i) + w(i)
        s = (s + s) - s
        y(i) = ((x(i) - s) + w(i)) + y(i)
        x(i) = s
 10   CONTINUE
      RETURN

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