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/*
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Copyright (c) 1993 Open Software Foundation, Inc.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software
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and its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appears in all
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copies and that both the copyright notice and this permission
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notice appear in supporting documentation.
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OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING
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ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE.
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IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
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CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
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NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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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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/**********************************************************************
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$Author: release $
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$Date: 1998/02/04 15:49:06 $
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$Revision: 1.2 $
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$Log: regable.c,v $
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* Revision 1.2 1998/02/04 15:49:06 release
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* Added OSF copyright message.
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*
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* Revision 1.1.1.1 1998/01/17 15:55:57 release
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* First version to be checked into rolling release.
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*
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* Revision 1.2 1996/10/04 16:03:54 pwe
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* add banners and mod for PWE ownership
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*
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**********************************************************************/
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/******************************************************************
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regable.c
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This has procedures to determine whether ident exp will fit in a
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register. Called, for example, by needs scan which uses these procs to
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decide whether to mark the props of the exp with inreg_bits or infreg_bits
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or neither.
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******************************************************************/
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#include "config.h"
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#include "memtdf.h"
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#include "codegen.h"
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#include "comment.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 PROTO_N ((s)) PROTO_T (shape s)
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{
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int n = name(s);
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if (is_floating(n) || IS_AGGREGATE(s))
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{
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/* floats, compound and arreay not generally in fixed reg */
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return 0;
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}
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else
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{
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return shape_size(s)<=32 && n!=tophd;
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}
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}
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bool fixregable PROTO_N ((e)) PROTO_T (exp e)
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{
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if (!isvis(e) && !isoutpar(e) && !isglob(e) )
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{
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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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{
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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 PROTO_N ((e)) PROTO_T (exp e)
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{
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if (!isvis(e) && !isoutpar(e) && !isglob(e) )
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{
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shape s = sh(son(e));
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return is_floating(name(s));
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}
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else
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{
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return 0;
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}
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}
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