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/* blas/ddot.f -- translated by f2c (version 20050501).
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
*/
#ifdef __cplusplus
extern "C" {
#endif
#include "v3p_netlib.h"
/*< double precision function ddot(n,dx,incx,dy,incy) >*/
doublereal ddot_(integer *n, doublereal *dx, integer *incx, doublereal *dy,
integer *incy)
{
/* System generated locals */
integer i__1;
doublereal ret_val;
/* Local variables */
integer i__, m, ix, iy, mp1;
doublereal dtemp;
/* forms the dot product of two vectors. */
/* uses unrolled loops for increments equal to one. */
/* jack dongarra, linpack, 3/11/78. */
/* modified 12/3/93, array(1) declarations changed to array(*) */
/*< double precision dx(*),dy(*),dtemp >*/
/*< integer i,incx,incy,ix,iy,m,mp1,n >*/
/*< ddot = 0.0d0 >*/
/* Parameter adjustments */
--dy;
--dx;
/* Function Body */
ret_val = 0.;
/*< dtemp = 0.0d0 >*/
dtemp = 0.;
/*< if(n.le.0)return >*/
if (*n <= 0) {
return ret_val;
}
/*< if(incx.eq.1.and.incy.eq.1)go to 20 >*/
if (*incx == 1 && *incy == 1) {
goto L20;
}
/* code for unequal increments or equal increments */
/* not equal to 1 */
/*< ix = 1 >*/
ix = 1;
/*< iy = 1 >*/
iy = 1;
/*< if(incx.lt.0)ix = (-n+1)*incx + 1 >*/
if (*incx < 0) {
ix = (-(*n) + 1) * *incx + 1;
}
/*< if(incy.lt.0)iy = (-n+1)*incy + 1 >*/
if (*incy < 0) {
iy = (-(*n) + 1) * *incy + 1;
}
/*< do 10 i = 1,n >*/
i__1 = *n;
for (i__ = 1; i__ <= i__1; ++i__) {
/*< dtemp = dtemp + dx(ix)*dy(iy) >*/
dtemp += dx[ix] * dy[iy];
/*< ix = ix + incx >*/
ix += *incx;
/*< iy = iy + incy >*/
iy += *incy;
/*< 10 continue >*/
/* L10: */
}
/*< ddot = dtemp >*/
ret_val = dtemp;
/*< return >*/
return ret_val;
/* code for both increments equal to 1 */
/* clean-up loop */
/*< 20 m = mod(n,5) >*/
L20:
m = *n % 5;
/*< if( m .eq. 0 ) go to 40 >*/
if (m == 0) {
goto L40;
}
/*< do 30 i = 1,m >*/
i__1 = m;
for (i__ = 1; i__ <= i__1; ++i__) {
/*< dtemp = dtemp + dx(i)*dy(i) >*/
dtemp += dx[i__] * dy[i__];
/*< 30 continue >*/
/* L30: */
}
/*< if( n .lt. 5 ) go to 60 >*/
if (*n < 5) {
goto L60;
}
/*< 40 mp1 = m + 1 >*/
L40:
mp1 = m + 1;
/*< do 50 i = mp1,n,5 >*/
i__1 = *n;
for (i__ = mp1; i__ <= i__1; i__ += 5) {
/*< >*/
dtemp = dtemp + dx[i__] * dy[i__] + dx[i__ + 1] * dy[i__ + 1] + dx[
i__ + 2] * dy[i__ + 2] + dx[i__ + 3] * dy[i__ + 3] + dx[i__ +
4] * dy[i__ + 4];
/*< 50 continue >*/
/* L50: */
}
/*< 60 ddot = dtemp >*/
L60:
ret_val = dtemp;
/*< return >*/
return ret_val;
/*< end >*/
} /* ddot_ */
#ifdef __cplusplus
}
#endif
|
