POK
finite.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 /* @(#)s_finite.c 5.1 93/09/24 */
18 /*
19  * ====================================================
20  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
21  *
22  * Developed at SunPro, a Sun Microsystems, Inc. business.
23  * Permission to use, copy, modify, and distribute this
24  * software is freely granted, provided that this notice
25  * is preserved.
26  * ====================================================
27  */
28 
29 /*
30  * finite(x) returns 1 is x is finite, else 0;
31  * no branching!
32  */
33 
34 #ifdef POK_NEEDS_LIBMATH
35 
36 #include <libm.h>
37 #include "math_private.h"
38 
39 int
40 finite(double x)
41 {
42  int32_t hx;
43  GET_HIGH_WORD(hx,x);
44  return (int)((uint32_t)((hx&0x7fffffff)-0x7ff00000)>>31);
45 }
46 
47 #endif