POK
sqrtf.c
1 /*
2  * POK header
3  *
4  * The following file is a part of the POK project. Any modification should
5  * made according to the POK licence. You CANNOT use this file or a part of
6  * this file is this part of a file for your own project
7  *
8  * For more information on the POK licence, please see our LICENCE FILE
9  *
10  * Please follow the coding guidelines described in doc/CODING_GUIDELINES
11  *
12  * Copyright (c) 2007-2009 POK team
13  *
14  * Created by julien on Fri Jan 30 14:41:34 2009
15  */
16 
17 /* w_sqrtf.c -- float version of w_sqrt.c.
18  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
19  */
20 
21 /*
22  * ====================================================
23  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
24  *
25  * Developed at SunPro, a Sun Microsystems, Inc. business.
26  * Permission to use, copy, modify, and distribute this
27  * software is freely granted, provided that this notice
28  * is preserved.
29  * ====================================================
30  */
31 
32 #ifdef POK_NEEDS_LIBMATH
33 
34 /*
35  * wrapper sqrtf(x)
36  */
37 
38 #include "math_private.h"
39 #include <libm.h>
40 
41 float
42 sqrtf(float x) /* wrapper sqrtf */
43 {
44 #ifdef _IEEE_LIBM
45  return __ieee754_sqrtf(x);
46 #else
47  float z;
48  z = __ieee754_sqrtf(x);
49  if (isnanf(x)) return z;
50  if(x<(float)0.0) {
51  /* sqrtf(negative) */
52  return (float)-1.0;
53  } else
54  return z;
55 #endif
56 }
57 
58 #endif