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

/* Subroutine */ int zaxpy_(integer *n, doublecomplex *za, doublecomplex *zx, 
	integer *incx, doublecomplex *zy, integer *incy)
{
    /* System generated locals */
    integer i__1, i__2, i__3, i__4;
    doublecomplex z__1, z__2;
    /* Local variables */
    static integer i__;
    extern doublereal dcabs1_(doublecomplex *);
    static integer ix, iy;
/*     constant times a vector plus a vector.   
       jack dongarra, 3/11/78.   
       modified 12/3/93, array(1) declarations changed to array(*)   
       Parameter adjustments */
    --zy;
    --zx;
    /* Function Body */
    if (*n <= 0) {
	return 0;
    }
    if (dcabs1_(za) == 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__) {
	i__2 = iy;
	i__3 = iy;
	i__4 = ix;
	z__2.r = za->r * zx[i__4].r - za->i * zx[i__4].i, z__2.i = za->r * zx[
		i__4].i + za->i * zx[i__4].r;
	z__1.r = zy[i__3].r + z__2.r, z__1.i = zy[i__3].i + z__2.i;
	zy[i__2].r = z__1.r, zy[i__2].i = z__1.i;
	ix += *incx;
	iy += *incy;
/* L10: */
    }
    return 0;
/*        code for both increments equal to 1 */
L20:
    i__1 = *n;
    for (i__ = 1; i__ <= i__1; ++i__) {
	i__2 = i__;
	i__3 = i__;
	i__4 = i__;
	z__2.r = za->r * zx[i__4].r - za->i * zx[i__4].i, z__2.i = za->r * zx[
		i__4].i + za->i * zx[i__4].r;
	z__1.r = zy[i__3].r + z__2.r, z__1.i = zy[i__3].i + z__2.i;
	zy[i__2].r = z__1.r, zy[i__2].i = z__1.i;
/* L30: */
    }
    return 0;
} /* zaxpy_ */

