source: soft/giet_vm/giet_libs/math/s_finite.c

Last change on this file was 777, checked in by meunier, 9 years ago
  • Ajout de quelques fonction dans la lib math
  • Déplacement de certaines fonctions de stdlib vers string
File size: 792 bytes
Line 
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/* Modified for GIET-VM static OS at UPMC, France 2015.
13 */
14
15/*
16 * finite(x) returns 1 is x is finite, else 0;
17 * no branching!
18 */
19
20#include "../math.h"
21#include "math_private.h"
22
23int isfinite(double x)
24{
25        uint32_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
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