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/* dla_wwaddw.f -- translated by f2c (version 20061008).
You must link the resulting object file with libf2c:
on Microsoft Windows system, link with libf2c.lib;
on Linux or Unix systems, link with .../path/to/libf2c.a -lm
or, if you install libf2c.a in a standard place, with -lf2c -lm
-- in that order, at the end of the command line, as in
cc *.o -lf2c -lm
Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,
http://www.netlib.org/f2c/libf2c.zip
*/
#include "f2c.h"
#include "blaswrap.h"
/* Subroutine */ int dla_wwaddw__(integer *n, doublereal *x, doublereal *y,
doublereal *w)
{
/* System generated locals */
integer i__1;
/* Local variables */
integer i__;
doublereal s;
/* -- LAPACK routine (version 3.2) -- */
/* -- Contributed by James Demmel, Deaglan Halligan, Yozo Hida and -- */
/* -- Jason Riedy of Univ. of California Berkeley. -- */
/* -- November 2008 -- */
/* -- LAPACK is a software package provided by Univ. of Tennessee, -- */
/* -- Univ. of California Berkeley and NAG Ltd. -- */
/* .. */
/* .. Scalar Arguments .. */
/* .. */
/* .. Array Arguments .. */
/* .. */
/* Purpose */
/* ======= */
/* DLA_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. */
/* Arguments */
/* ========= */
/* N (input) INTEGER */
/* The length of vectors X, Y, and W. */
/* X, Y (input/output) DOUBLE PRECISION array, length N */
/* The doubled-single accumulation vector. */
/* W (input) DOUBLE PRECISION array, length N */
/* The vector to be added. */
/* .. */
/* .. Local Scalars .. */
/* .. */
/* .. Executable Statements .. */
/* Parameter adjustments */
--w;
--y;
--x;
/* Function Body */
i__1 = *n;
for (i__ = 1; i__ <= i__1; ++i__) {
s = x[i__] + w[i__];
s = s + s - s;
y[i__] = x[i__] - s + w[i__] + y[i__];
x[i__] = s;
/* L10: */
}
return 0;
} /* dla_wwaddw__ */
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