3 doublereal ddot_(integer *n, doublereal *dx, integer *incx, doublereal *dy,
6 /* System generated locals */
11 integer i__, m, ix, iy, mp1;
14 /* .. Scalar Arguments .. */
16 /* .. Array Arguments .. */
22 /* forms the dot product of two vectors. */
23 /* uses unrolled loops for increments equal to one. */
24 /* jack dongarra, linpack, 3/11/78. */
25 /* modified 12/3/93, array(1) declarations changed to array(*) */
28 /* .. Local Scalars .. */
30 /* .. Intrinsic Functions .. */
32 /* Parameter adjustments */
42 if (*incx == 1 && *incy == 1) {
46 /* code for unequal increments or equal increments */
52 ix = (-(*n) + 1) * *incx + 1;
55 iy = (-(*n) + 1) * *incy + 1;
58 for (i__ = 1; i__ <= i__1; ++i__) {
59 dtemp += dx[ix] * dy[iy];
67 /* code for both increments equal to 1 */
78 for (i__ = 1; i__ <= i__1; ++i__) {
79 dtemp += dx[i__] * dy[i__];
88 for (i__ = mp1; i__ <= i__1; i__ += 5) {
89 dtemp = dtemp + dx[i__] * dy[i__] + dx[i__ + 1] * dy[i__ + 1] + dx[
90 i__ + 2] * dy[i__ + 2] + dx[i__ + 3] * dy[i__ + 3] + dx[i__ +