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s_finite.c
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1 
2 /* @(#)s_finite.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  * finite(x) returns 1 is x is finite, else 0;
16  * no branching!
17  */
18 
19 #include "fdlibm.h"
20 
21 #ifdef __STDC__
22  int finite(double x)
23 #else
24  int finite(x)
25  double x;
26 #endif
27 {
28  int hx;
29  hx = __HI(x);
30  return (unsigned)((hx&0x7fffffff)-0x7ff00000)>>31;
31 }