1 /* @(#)w_sqrt.c 5.1 93/09/24 */
2 /*
3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5 *
6 * Developed at SunPro, a Sun Microsystems, Inc. business.
7 * Permission to use, copy, modify, and distribute this
8 * software is freely granted, provided that this notice
9 * is preserved.
10 * ====================================================
11 */
12
13 #include <sys/cdefs.h>
14 #if defined(LIBM_SCCS) && !defined(lint)
15 __RCSID("$NetBSD: w_sqrt.c,v 1.10 2013/11/19 19:24:34 joerg Exp $");
16 #endif
17
18 /*
19 * wrapper sqrt(x)
20 */
21
22 #include "namespace.h"
23 #include "math.h"
24 #include "math_private.h"
25
26 #ifndef __HAVE_LONG_DOUBLE
__strong_alias(_sqrtl,sqrt)27 __strong_alias(_sqrtl, sqrt)
28 __weak_alias(sqrtl, _sqrtl)
29 #endif
30
31 double
32 sqrt(double x) /* wrapper sqrt */
33 {
34 #ifdef _IEEE_LIBM
35 return __ieee754_sqrt(x);
36 #else
37 double z;
38 z = __ieee754_sqrt(x);
39 if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
40 if(x<0.0) {
41 return __kernel_standard(x,x,26); /* sqrt(negative) */
42 } else
43 return z;
44 #endif
45 }
46