/* ./util_f77/iswap.f -- translated by f2c (version 20030320).
   You must link the resulting object file with the libraries:
	-lf2c -lm   (in that order)
*/

#include <punc/vf2c.h>

/* Subroutine */ int iswap_(integer *n, integer *sx, integer *incx, integer *
	sy, integer *incy)
{
    /* System generated locals */
    integer i__1;

    /* Local variables */
    static integer i__, m, ix, iy, mp1, stemp;


/*     interchanges two vectors. */
/*     uses unrolled loops for increments equal to 1. */
/*     jack dongarra, linpack, 3/11/78. */


    /* 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;
} /* iswap_ */

