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

doublereal slapy3_(real *x, real *y, real *z__)
{
/*  -- LAPACK auxiliary routine (version 3.1) --   
       Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..   
       November 2006   


    Purpose   
    =======   

    SLAPY3 returns sqrt(x**2+y**2+z**2), taking care not to cause   
    unnecessary overflow.   

    Arguments   
    =========   

    X       (input) REAL   
    Y       (input) REAL   
    Z       (input) REAL   
            X, Y and Z specify the values x, y and z.   

    ===================================================================== */
    /* System generated locals */
    real ret_val, r__1, r__2, r__3;
    /* Builtin functions */
    double sqrt(doublereal);
    /* Local variables */
    static real w, xabs, yabs, zabs;



    xabs = dabs(*x);
    yabs = dabs(*y);
    zabs = dabs(*z__);
/* Computing MAX */
    r__1 = max(xabs,yabs);
    w = dmax(r__1,zabs);
    if (w == 0.f) {
/*     W can be zero for max(0,nan,0)   
       adding all three entries together will make sure   
       NaN will not disappear. */
	ret_val = xabs + yabs + zabs;
    } else {
/* Computing 2nd power */
	r__1 = xabs / w;
/* Computing 2nd power */
	r__2 = yabs / w;
/* Computing 2nd power */
	r__3 = zabs / w;
	ret_val = w * sqrt(r__1 * r__1 + r__2 * r__2 + r__3 * r__3);
    }
    return ret_val;

/*     End of SLAPY3 */

} /* slapy3_ */