/* @(#)s_isnan.c 5.1 93/09/24 */

/*

 * ====================================================

 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

 *

 * Developed at SunPro, a Sun Microsystems, Inc. business.

 * Permission to use, copy, modify, and distribute this

 * software is freely granted, provided that this notice

 * is preserved.

 * ====================================================

 */

#if defined(LIBM_SCCS) && !defined(lint)

static char rcsid[] = "$NetBSD: s_isnan.c,v 1.8 1995/05/10 20:47:36 jtc Exp $";

#endif

/*

 * isnan(x) returns 1 is x is nan, else 0;

 * no branching!

 */

#include <math.h>

#include <math_private.h>

#include <ldbl-classify-compat.h>

#include <shlib-compat.h>

#undef __isnan

int

__isnan (double x)

{

  int32_t hx, lx;

  EXTRACT_WORDS (hx, lx, x);

  hx &= 0x7fffffff;

  hx |= (uint32_t) (lx | (-lx)) >> 31;

  hx = 0x7ff00000 - hx;

  return (int) (((uint32_t) hx) >> 31);

}

hidden_def (__isnan)

weak_alias (__isnan, isnan)

#ifdef NO_LONG_DOUBLE

# if LDBL_CLASSIFY_COMPAT && SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_23)

compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);

# endif

weak_alias (__isnan, isnanl)

#endif