1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
/* blas/sdot.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"
/*< real function sdot(n,sx,incx,sy,incy) >*/
doublereal sdot_(integer *n, real *sx, integer *incx, real *sy, integer *incy)
{
/* System generated locals */
integer i__1;
real ret_val;
/* Local variables */
integer i__, m, ix, iy, mp1;
real stemp;
/* 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(*) */
/*< real sx(*),sy(*),stemp >*/
/*< integer i,incx,incy,ix,iy,m,mp1,n >*/
/*< stemp = 0.0e0 >*/
/* Parameter adjustments */
--sy;
--sx;
/* Function Body */
stemp = (float)0.;
/*< sdot = 0.0e0 >*/
ret_val = (float)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__) {
/*< stemp = stemp + sx(ix)*sy(iy) >*/
stemp += sx[ix] * sy[iy];
/*< ix = ix + incx >*/
ix += *incx;
/*< iy = iy + incy >*/
iy += *incy;
/*< 10 continue >*/
/* L10: */
}
/*< sdot = stemp >*/
ret_val = stemp;
/*< 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__) {
/*< stemp = stemp + sx(i)*sy(i) >*/
stemp += sx[i__] * sy[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) {
/*< >*/
stemp = stemp + sx[i__] * sy[i__] + sx[i__ + 1] * sy[i__ + 1] + sx[
i__ + 2] * sy[i__ + 2] + sx[i__ + 3] * sy[i__ + 3] + sx[i__ +
4] * sy[i__ + 4];
/*< 50 continue >*/
/* L50: */
}
/*< 60 sdot = stemp >*/
L60:
ret_val = stemp;
/*< return >*/
return ret_val;
/*< end >*/
} /* sdot_ */
#ifdef __cplusplus
}
#endif
|
