1 /*
2 * ====================================================
3 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
4 *
5 * Developed at SunPro, a Sun Microsystems, Inc. business.
6 * Permission to use, copy, modify, and distribute this
7 * software is freely granted, provided that this notice
8 * is preserved.
9 * ====================================================
10 */
11
12 /*
13 * finite(x) returns 1 is x is finite, else 0;
14 * no branching!
15 */
16
17 #include <features.h>
18 /* Prevent math.h from defining a colliding inline */
19 #undef __USE_EXTERN_INLINES
20 #include "math.h"
21 #include "math_private.h"
22
__finite(double x)23 int __finite(double x)
24 {
25 u_int32_t hx;
26
27 GET_HIGH_WORD(hx, x);
28 /* Finite numbers have at least one zero bit in exponent. */
29 /* All other numbers will result in 0xffffffff after OR: */
30 return (hx | 0x800fffff) != 0xffffffff;
31 }
32 libm_hidden_def(__finite)
33