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- /* sdot.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"
- 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;
- /* .. Scalar Arguments .. */
- /* .. */
- /* .. Array Arguments .. */
- /* .. */
- /* Purpose */
- /* ======= */
- /* 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(*) */
- /* .. Local Scalars .. */
- /* .. */
- /* .. Intrinsic Functions .. */
- /* .. */
- /* Parameter adjustments */
- --sy;
- --sx;
- /* Function Body */
- stemp = 0.f;
- ret_val = 0.f;
- if (*n <= 0) {
- return ret_val;
- }
- if (*incx == 1 && *incy == 1) {
- goto L20;
- }
- /* code for unequal increments or equal increments */
- /* not equal to 1 */
- ix = 1;
- iy = 1;
- if (*incx < 0) {
- ix = (-(*n) + 1) * *incx + 1;
- }
- if (*incy < 0) {
- iy = (-(*n) + 1) * *incy + 1;
- }
- i__1 = *n;
- for (i__ = 1; i__ <= i__1; ++i__) {
- stemp += sx[ix] * sy[iy];
- ix += *incx;
- iy += *incy;
- /* L10: */
- }
- ret_val = stemp;
- return ret_val;
- /* code for both increments equal to 1 */
- /* clean-up loop */
- L20:
- m = *n % 5;
- if (m == 0) {
- goto L40;
- }
- i__1 = m;
- for (i__ = 1; i__ <= i__1; ++i__) {
- stemp += sx[i__] * sy[i__];
- /* L30: */
- }
- if (*n < 5) {
- goto L60;
- }
- L40:
- mp1 = m + 1;
- 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];
- /* L50: */
- }
- L60:
- ret_val = stemp;
- return ret_val;
- } /* sdot_ */
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