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/*
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 * Copyright (c) 2002-2005 The TenDRA Project <http://www.tendra.org/>.
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions are met:
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 *
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 * 1. Redistributions of source code must retain the above copyright notice,
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 *    this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright notice,
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 *    this list of conditions and the following disclaimer in the documentation
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 *    and/or other materials provided with the distribution.
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 * 3. Neither the name of The TenDRA Project nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific, prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
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 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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 * EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 *
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 * $Id$
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 */
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/*
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    		 Crown Copyright (c) 1997
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    This TenDRA(r) Computer Program is subject to Copyright
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    owned by the United Kingdom Secretary of State for Defence
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    acting through the Defence Evaluation and Research Agency
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    (DERA).  It is made available to Recipients with a
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    royalty-free licence for its use, reproduction, transfer
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    to other parties and amendment for any purpose not excluding
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    product development provided that any such use et cetera
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    shall be deemed to be acceptance of the following conditions:-
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        (1) Its Recipients shall ensure that this Notice is
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        reproduced upon any copies or amended versions of it;
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        (2) Any amended version of it shall be clearly marked to
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        show both the nature of and the organisation responsible
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        for the relevant amendment or amendments;
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        (3) Its onward transfer from a recipient to another
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        party shall be deemed to be that party's acceptance of
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        these conditions;
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        (4) DERA gives no warranty or assurance as to its
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        quality or suitability for any purpose and DERA accepts
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        no liability whatsoever in relation to any use to which
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        it may be put.
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*/
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/* 80x86/is_worth.c */
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/**********************************************************************
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$Author: release $
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$Date: 1998/01/17 15:55:52 $
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$Revision: 1.1.1.1 $
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$Log: is_worth.c,v $
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 * Revision 1.1.1.1  1998/01/17  15:55:52  release
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 * First version to be checked into rolling release.
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 *
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 * Revision 1.2  1995/01/30  12:56:29  pwe
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 * Ownership -> PWE, tidy banners
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 *
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 * Revision 1.1  1994/10/27  14:15:22  jmf
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 * Initial revision
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 *
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 * Revision 1.5  1994/07/15  13:58:07  jmf
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 * Admit global real consts. Safeguard father.
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 *
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 * Revision 1.4  1994/07/12  15:13:07  jmf
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 * protected father for test_tag
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 *
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 * Revision 1.3  1994/07/12  15:12:11  jmf
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 * Replaced keywords
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 *
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 * Revision 1.1  1994/07/12  14:35:40  jmf
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 * Initial revision
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 *
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**********************************************************************/
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#include "config.h"
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#include "common_types.h"
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#include "tags.h"
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#include "expmacs.h"
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#include "exp.h"
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#include "shapemacs.h"
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#include "is_worth.h"
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/* PROCEDURES */
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int is_worth
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(exp c)
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{
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				/* decide if constant c is worth declaring
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				   separately */
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  unsigned char cnam = name(c);
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  if (name(sh(c)) == realhd && cnam == cont_tag &&
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	name(son(c)) == name_tag && isvar(son(son(c))) &&
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	isglob(son(son(c))))
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    return 1;
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  if (cnam == cont_tag && name(son(c)) == name_tag &&
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       !isvar(son(son(c)))) {
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    return 1;
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  }
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  return((!is_o(cnam) && cnam != clear_tag &&
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	   cnam != int_to_bitf_tag && cnam != bitf_to_int_tag) ||
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  /* ignore simple things unless ... */
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     (cnam == cont_tag && name(son(c)) == cont_tag &&
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	name(son(son(c))) == name_tag)
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      || (cnam == name_tag &&
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         (isloadparam(son(c)) || isparam(son(c))) &&
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          !isvar(son(c)) &&
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          shape_size(sh(c)) <= 32
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          && name(sh(c))!= shrealhd
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        )
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      || (cnam == cont_tag && name(son(c)) == name_tag &&
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	   isvar(son(son(c))) && isglob(son(son(c))) &&
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	  ((last(c) && bro(c)!= nilexp) ||
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		(!last(c) && last(bro(c)) && bro(bro(c))!= nilexp)) &&
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	   name(father(c)) == test_tag)
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   );
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}