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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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/**********************************************************************
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$Author: release $
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$Date: 1998/01/17 15:56:06 $
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$Revision: 1.1.1.1 $
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$Log: regable.c,v $
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* Revision 1.1.1.1 1998/01/17 15:56:06 release
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* First version to be checked into rolling release.
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*
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* Revision 1.3 1995/12/12 09:02:19 currie
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* out_pars not regable
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*
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* Revision 1.2 1995/09/22 15:49:17 currie
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* added outpar
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*
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* Revision 1.1 1995/04/13 09:08:06 currie
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* Initial revision
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*
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***********************************************************************/
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/******************************************************************
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regable.c
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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 "tags.h"
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#include "regable.h"
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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 register. Uses
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macros isvis, isglob, iscaonly from expmacs.h which examine the props
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field. The iscaonly bit is set by proc independent if the tag is only used
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by the contents operator or as the left hand side of an assignment. The
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procedure also uses the macro is_floating from shapemacs.h which checks
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the shape number is in the range for floating point shapes.
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****************************************************************/
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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)) { /* 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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/* ALTERATION #1 */
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return (a.ashsize <=32 && n!=cpdhd && n!= nofhd && n!=tophd);
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}
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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) && !isoutpar(e) && !isglob (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 register, single
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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) && !isoutpar(e) && !isglob (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
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(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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