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w_sqrt.c
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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__
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 }