text: /*	$NetBSD: floatdisf.c,v 1.4 1997/07/13 20:01:47 christos 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. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *	This product includes software developed by the University of
   *	California, Berkeley and its contributors.
   * 4. 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.
   */
  
  #include <sys/cdefs.h>
  #if defined(LIBC_SCCS) && !defined(lint)
  #if 0
  static char sccsid[] = "@(#)floatdisf.c	8.1 (Berkeley) 6/4/93";
  #else
  __RCSID("$NetBSD: floatdisf.c,v 1.4 1997/07/13 20:01:47 christos Exp $");
  #endif
  #endif /* LIBC_SCCS and not lint */
  
  #include "quad.h"
  
  /*
   * Convert (signed) quad to float.
   */
  float
  __floatdisf(x)
  	quad_t x;
  {
  	float f;
  	union uu u;
  	int neg;
  
  	/*
  	 * Get an unsigned number first, by negating if necessary.
  	 */
  	if (x < 0)
  		u.q = -x, neg = 1;
  	else
  		u.q = x, neg = 0;
  
  	/*
  	 * Now u.ul[H] has the factor of 2^32 (or whatever) and u.ul[L]
  	 * has the units.  Ideally we could just set f, add LONG_BITS to
  	 * its exponent, and then add the units, but this is portable
  	 * code and does not know how to get at an exponent.  Machine-
  	 * specific code may be able to do this more efficiently.
  	 *
  	 * Using double here may be excessive paranoia.
  	 */
  	f = (double)u.ul[H] * (((long)1 << (LONG_BITS - 2)) * 4.0);
  	f += u.ul[L];
  
  	return (neg ? -f : f);
  }
  