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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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/* 	$Id: regable.c,v 1.1.1.1 1998/01/17 15:56:01 release Exp $	 */
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#ifndef lint
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static char vcid[] = "$Id: regable.c,v 1.1.1.1 1998/01/17 15:56:01 release Exp $";
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#endif /* lint */
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/*
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   regable.c
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*/
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/*
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$Log: regable.c,v $
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 * Revision 1.1.1.1  1998/01/17  15:56:01  release
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 * First version to be checked into rolling release.
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 *
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 * Revision 1.4  1996/01/17  09:30:47  john
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 * Change for new caller access method
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 *
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 * Revision 1.3  1995/09/29  09:45:41  john
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 * Added outpar
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 *
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 * Revision 1.2  1995/05/16  10:54:51  john
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 * Cosmetic changes
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 *
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 * Revision 1.1.1.1  1995/03/23  10:39:19  john
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 * Entered into CVS
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 *
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 * Revision 1.3  1995/03/17  10:12:11  john
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 * Changed valregable, so bitfields can now be put into registers.
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 *
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*/
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#include "config.h"
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#include "expmacs.h"
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#include "common_types.h"
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#include "shapemacs.h"
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#include "regable.h"
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#include "tags.h"
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bool valregable
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    PROTO_N ( ( s ) )
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    PROTO_T ( shape s )
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{
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  int n = name(s);
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  if (is_floating (n)) {
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    /* check shape to see if floating point */
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    return 0;
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  }
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  else {
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    ash a;
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    a = ashof (s);		/* get ash corresponding to shape of e */
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    return (a.ashsize <=64 && n!=cpdhd && n!= nofhd);
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  }
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}
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/*
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  fixregable
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  determines whether the exp e can fit in a single fixed point
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  register. Uses macros isvis, isglob from expmacs.h which examine
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  the props field.
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*/
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bool fixregable
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    PROTO_N ( ( e ) )
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    PROTO_T ( exp e )
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{
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  if (!isvis (e) && !isglob (e) && !isoutpar(e) &&
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      name(son(e))!=caller_name_tag) {
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    shape s = sh (son (e));	/* son of ident exp is def */
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    return valregable (s);
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  }
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  else {
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    return 0;
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  }
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}
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/*
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  floatregable
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  determines whether the exp e can fit in a floating point
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  register, single or double.
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*/
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bool floatregable
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    PROTO_N ( ( e ) )
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    PROTO_T ( exp e )
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{
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  if (!isvis (e) && !isglob (e) && !isoutpar(e) &&
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      name(son(e))!=caller_name_tag) {
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    shape s = sh (son (e));
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    if (is_floating(name (s))) {
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      return 1;
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    }
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    else {
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      return 0;
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    }
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  }
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  else {
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    return 0;
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  }
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}
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