1/* s_isnanl.c -- long double version for i387 of s_isnan.c.
2 * Conversion to long double by Ulrich Drepper,
3 * Cygnus Support, drepper@cygnus.com.
4 */
5
6/*
7 * ====================================================
8 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
9 *
10 * Developed at SunPro, a Sun Microsystems, Inc. business.
11 * Permission to use, copy, modify, and distribute this
12 * software is freely granted, provided that this notice
13 * is preserved.
14 * ====================================================
15 */
16
17#if defined(LIBM_SCCS) && !defined(lint)
18static char rcsid[] = "$NetBSD: $";
19#endif
20
21/*
22 * isnanl(x) returns 1 is x is nan, else 0;
23 * no branching!
24 */
25
26#include <math.h>
27#include <math_private.h>
28
29int __isnanl(long double x)
30{
31 int32_t se,hx,lx,pn;
32 GET_LDOUBLE_WORDS(se,hx,lx,x);
33 se = (se & 0x7fff) << 1;
34 /* Detect pseudo-normal numbers, i.e. exponent is non-zero and the top
35 bit of the significand is not set. */
36 pn = (uint32_t)((~hx & 0x80000000) & (se|(-se)))>>31;
37 /* Clear the significand bit when computing mantissa. */
38 lx |= hx & 0x7fffffff;
39 se |= (uint32_t)(lx|(-lx))>>31;
40 se = 0xfffe - se;
41
42 return (int)(((uint32_t)(se)) >> 16) | pn;
43}
44hidden_def (__isnanl)
45weak_alias (__isnanl, isnanl)
46