#include "blaswrap.h"
#include "f2c.h"

doublereal sdot_(integer *n, real *sx, integer *incx, real *sy, integer *incy)
{
    /* System generated locals */
    integer i__1;
    real ret_val;
    /* Local variables */
    static integer i__, m, ix, iy, mp1;
    static real stemp;
/*  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(*)   
       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_ */