/*      $NetBSD: fpclassifyd_ieee754.c,v 1.2 2008/04/28 20:22:59 martin Exp $   */

/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Klaus Klein.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: fpclassifyd_ieee754.c,v 1.2 2008/04/28 20:22:59 martin Exp $");
#endif

#include <machine/ieee.h>
#include <math.h>

/*
* 7.12.3.1 fpclassify - classify real floating type
*          IEEE 754 double-precision version
*/
int
__fpclassifyd(double x)
{
       union ieee_double_u u;

       u.dblu_d = x;

       if (u.dblu_dbl.dbl_exp == 0) {
               if (u.dblu_dbl.dbl_frach == 0 && u.dblu_dbl.dbl_fracl == 0)
                       return FP_ZERO;
               else
                       return FP_SUBNORMAL;
       } else if (u.dblu_dbl.dbl_exp == DBL_EXP_INFNAN) {
               if (u.dblu_dbl.dbl_frach == 0 && u.dblu_dbl.dbl_fracl == 0)
                       return FP_INFINITE;
               else
                       return FP_NAN;
       }

       return FP_NORMAL;
}