1 
2 /* @(#)w_sqrt.c 1.3 95/01/18 */
3 /*
4  * ====================================================
5  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6  *
7  * Developed at SunSoft, a Sun Microsystems, Inc. business.
8  * Permission to use, copy, modify, and distribute this
9  * software is freely granted, provided that this notice
10  * is preserved.
11  * ====================================================
12  */
13 
14 /*
15  * wrapper sqrt(x)
16  */
17 
18 #include "fdlibm.h"
19 
20 #ifdef __STDC__
sqrt(double x)21 	double sqrt(double x)		/* wrapper sqrt */
22 #else
23 	double sqrt(x)			/* wrapper sqrt */
24 	double x;
25 #endif
26 {
27 #ifdef _IEEE_LIBM
28 	return __ieee754_sqrt(x);
29 #else
30 	double z;
31 	z = __ieee754_sqrt(x);
32 	if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
33 	if(x<0.0) {
34 	    return __kernel_standard(x,x,26); /* sqrt(negative) */
35 	} else
36 	    return z;
37 #endif
38 }
39