text: /*	$NetBSD: isinfl.c,v 1.5 2004/03/04 23:42:38 kleink Exp $	*/
  /*	$DragonFly: src/lib/libc/i386/gen/isinfl.c,v 1.1 2005/07/26 21:15:19 joerg Exp $ */
  
  /*
   * Copyright (c) 1992, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * This software was developed by the Computer Systems Engineering group
   * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   * contributed to Berkeley.
   *
   * 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.
   * 3. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
   *
   * from: Header: isinf.c,v 1.1 91/07/08 19:03:34 torek Exp
   */
  
  #include <machine/ieee.h>
  #include <math.h>
  
  /*
   * 7.12.3.3 isinf - test for infinity
   *          IEEE 754 compatible 80-bit extended-precision Intel 386 version
   */
  int
  __isinfl(long double x)
  {
  	union ieee_ext_u u;
  
  	u.extu_ld = x;
  
  	return (u.extu_ext.ext_exp == EXT_EXP_INFNAN &&
  	    (u.extu_ext.ext_int == 1 &&
  	     u.extu_ext.ext_frach == 0 && u.extu_ext.ext_fracl == 0));
  }
  