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

/* Subroutine */ int sswap_(integer *n, real *sx, integer *incx, real *sy, 
	integer *incy)
{
    /* System generated locals */
    integer i__1;
    /* Local variables */
    static integer i__, m;
    static real stemp;
    static integer ix, iy, mp1;
/*     interchanges two vectors.   
       uses unrolled loops for increments equal to 1.   
       jack dongarra, linpack, 3/11/78.   
       modified 12/3/93, array(1) declarations changed to array(*)   
       Parameter adjustments */
    --sy;
    --sx;
    /* Function Body */
    if (*n <= 0) {
	return 0;
    }
    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];
	sx[ix] = sy[iy];
	sy[iy] = stemp;
	ix += *incx;
	iy += *incy;
/* L10: */
    }
    return 0;
/*       code for both increments equal to 1   
         clean-up loop */
L20:
    m = *n % 3;
    if (m == 0) {
	goto L40;
    }
    i__1 = m;
    for (i__ = 1; i__ <= i__1; ++i__) {
	stemp = sx[i__];
	sx[i__] = sy[i__];
	sy[i__] = stemp;
/* L30: */
    }
    if (*n < 3) {
	return 0;
    }
L40:
    mp1 = m + 1;
    i__1 = *n;
    for (i__ = mp1; i__ <= i__1; i__ += 3) {
	stemp = sx[i__];
	sx[i__] = sy[i__];
	sy[i__] = stemp;
	stemp = sx[i__ + 1];
	sx[i__ + 1] = sy[i__ + 1];
	sy[i__ + 1] = stemp;
	stemp = sx[i__ + 2];
	sx[i__ + 2] = sy[i__ + 2];
	sy[i__ + 2] = stemp;
/* L50: */
    }
    return 0;
} /* sswap_ */

