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111 lines
2.8 KiB
111 lines
2.8 KiB
*> \brief \b SLA_WWADDW adds a vector into a doubled-single vector.
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*
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* =========== DOCUMENTATION ===========
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*
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* Online html documentation available at
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* http://www.netlib.org/lapack/explore-html/
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*
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*> \htmlonly
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*> Download SLA_WWADDW + dependencies
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*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/sla_wwaddw.f">
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*> [TGZ]</a>
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*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/sla_wwaddw.f">
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*> [ZIP]</a>
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*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/sla_wwaddw.f">
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*> [TXT]</a>
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*> \endhtmlonly
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*
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* Definition:
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* ===========
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*
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* SUBROUTINE SLA_WWADDW( N, X, Y, W )
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*
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* .. Scalar Arguments ..
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* INTEGER N
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* ..
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* .. Array Arguments ..
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* REAL X( * ), Y( * ), W( * )
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* ..
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*
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*
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*> \par Purpose:
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* =============
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*>
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*> \verbatim
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*>
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*> SLA_WWADDW adds a vector W into a doubled-single vector (X, Y).
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*>
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*> This works for all extant IBM's hex and binary floating point
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*> arithmetic, but not for decimal.
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*> \endverbatim
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*
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* Arguments:
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* ==========
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*
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*> \param[in] N
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*> \verbatim
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*> N is INTEGER
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*> The length of vectors X, Y, and W.
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*> \endverbatim
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*>
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*> \param[in,out] X
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*> \verbatim
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*> X is REAL array, dimension (N)
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*> The first part of the doubled-single accumulation vector.
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*> \endverbatim
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*>
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*> \param[in,out] Y
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*> \verbatim
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*> Y is REAL array, dimension (N)
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*> The second part of the doubled-single accumulation vector.
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*> \endverbatim
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*>
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*> \param[in] W
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*> \verbatim
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*> W is REAL array, dimension (N)
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*> The vector to be added.
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*> \endverbatim
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*
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* Authors:
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* ========
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*
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*> \author Univ. of Tennessee
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*> \author Univ. of California Berkeley
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*> \author Univ. of Colorado Denver
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*> \author NAG Ltd.
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*
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*> \ingroup realOTHERcomputational
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*
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* =====================================================================
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SUBROUTINE SLA_WWADDW( N, X, Y, W )
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*
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* -- LAPACK computational routine --
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* -- LAPACK is a software package provided by Univ. of Tennessee, --
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* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
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*
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* .. Scalar Arguments ..
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INTEGER N
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* ..
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* .. Array Arguments ..
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REAL X( * ), Y( * ), W( * )
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* ..
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*
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* =====================================================================
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*
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* .. Local Scalars ..
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REAL S
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INTEGER I
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* ..
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* .. Executable Statements ..
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*
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DO 10 I = 1, N
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S = X(I) + W(I)
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S = (S + S) - S
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Y(I) = ((X(I) - S) + W(I)) + Y(I)
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X(I) = S
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10 CONTINUE
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RETURN
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*
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* End of SLA_WWADDW
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*
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END
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