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https://gitlab.com/freepascal.org/fpc/source.git
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657 lines
26 KiB
ObjectPascal
657 lines
26 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1998-2002 by Florian Klaempfl
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Generate assembler for constant nodes which are the same for
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all (most) processors
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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****************************************************************************
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}
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unit ncgcon;
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{$i fpcdefs.inc}
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interface
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uses
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node,ncon;
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type
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tcgrealconstnode = class(trealconstnode)
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procedure pass_2;override;
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end;
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tcgordconstnode = class(tordconstnode)
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procedure pass_2;override;
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end;
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tcgpointerconstnode = class(tpointerconstnode)
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procedure pass_2;override;
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end;
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tcgstringconstnode = class(tstringconstnode)
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procedure pass_2;override;
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end;
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tcgsetconstnode = class(tsetconstnode)
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procedure pass_2;override;
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end;
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tcgnilnode = class(tnilnode)
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procedure pass_2;override;
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end;
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tcgguidconstnode = class(tguidconstnode)
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procedure pass_2;override;
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end;
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implementation
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uses
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globtype,widestr,systems,
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verbose,globals,
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symconst,symdef,aasmbase,aasmtai,aasmcpu,defutil,
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cpuinfo,cpubase,
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cginfo,cgbase,tgobj,rgobj
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{$ifdef delphi}
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,dmisc
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{$endif}
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;
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{*****************************************************************************
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TCGREALCONSTNODE
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*****************************************************************************}
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procedure tcgrealconstnode.pass_2;
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{ I suppose the parser/pass_1 must make sure the generated real }
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{ constants are actually supported by the target processor? (JM) }
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const
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floattype2ait:array[tfloattype] of taitype=
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(ait_real_32bit,ait_real_64bit,ait_real_80bit,ait_comp_64bit,ait_comp_64bit,ait_real_128bit);
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var
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hp1 : tai;
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lastlabel : tasmlabel;
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realait : taitype;
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begin
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location_reset(location,LOC_CREFERENCE,def_cgsize(resulttype.def));
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lastlabel:=nil;
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realait:=floattype2ait[tfloatdef(resulttype.def).typ];
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{ const already used ? }
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if not assigned(lab_real) then
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begin
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{ tries to find an old entry }
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hp1:=tai(Consts.first);
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while assigned(hp1) do
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begin
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if hp1.typ=ait_label then
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lastlabel:=tai_label(hp1).l
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else
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begin
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if (hp1.typ=realait) and (lastlabel<>nil) then
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begin
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if(
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((realait=ait_real_32bit) and (tai_real_32bit(hp1).value=value_real)) or
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((realait=ait_real_64bit) and (tai_real_64bit(hp1).value=value_real)) or
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((realait=ait_real_80bit) and (tai_real_80bit(hp1).value=value_real)) or
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((realait=ait_comp_64bit) and (tai_comp_64bit(hp1).value=value_real))
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) then
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begin
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{ found! }
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lab_real:=lastlabel;
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break;
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end;
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end;
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lastlabel:=nil;
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end;
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hp1:=tai(hp1.next);
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end;
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{ :-(, we must generate a new entry }
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if not assigned(lab_real) then
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begin
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objectlibrary.getdatalabel(lastlabel);
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lab_real:=lastlabel;
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if (cs_create_smart in aktmoduleswitches) then
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Consts.concat(Tai_cut.Create);
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consts.concat(tai_align.create(const_align(4)));
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Consts.concat(Tai_label.Create(lastlabel));
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case realait of
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ait_real_32bit :
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Consts.concat(Tai_real_32bit.Create(ts32real(value_real)));
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ait_real_64bit :
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Consts.concat(Tai_real_64bit.Create(ts64real(value_real)));
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ait_real_80bit :
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Consts.concat(Tai_real_80bit.Create(value_real));
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ait_comp_64bit :
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Consts.concat(Tai_comp_64bit.Create(value_real));
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else
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internalerror(10120);
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end;
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end;
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end;
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location.reference.symbol:=lab_real;
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end;
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{*****************************************************************************
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TCGORDCONSTNODE
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*****************************************************************************}
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procedure tcgordconstnode.pass_2;
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begin
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location_reset(location,LOC_CONSTANT,def_cgsize(resulttype.def));
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location.valueqword:=TConstExprUInt(value);
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end;
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{*****************************************************************************
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TCGPOINTERCONSTNODE
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*****************************************************************************}
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procedure tcgpointerconstnode.pass_2;
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begin
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{ an integer const. behaves as a memory reference }
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location_reset(location,LOC_CONSTANT,OS_ADDR);
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location.value:=AWord(value);
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end;
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{*****************************************************************************
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TCGSTRINGCONSTNODE
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*****************************************************************************}
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procedure tcgstringconstnode.pass_2;
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var
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hp1,hp2 : tai;
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l1,l2,
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lastlabel : tasmlabel;
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lastlabelhp : tai;
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pc : pchar;
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same_string : boolean;
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l,j,
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i,mylength : longint;
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begin
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{ for empty ansistrings we could return a constant 0 }
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if (st_type in [st_ansistring,st_widestring]) and
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(len=0) then
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begin
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location_reset(location,LOC_CONSTANT,OS_ADDR);
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location.value:=0;
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exit;
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end;
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{ return a constant reference in memory }
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location_reset(location,LOC_CREFERENCE,def_cgsize(resulttype.def));
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{ const already used ? }
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lastlabel:=nil;
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lastlabelhp:=nil;
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if not assigned(lab_str) then
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begin
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if is_shortstring(resulttype.def) then
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mylength:=len+2
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else
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mylength:=len+1;
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{ widestrings can't be reused yet }
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if not(is_widestring(resulttype.def)) then
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begin
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{ tries to found an old entry }
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hp1:=tai(Consts.first);
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while assigned(hp1) do
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begin
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if hp1.typ=ait_label then
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begin
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lastlabel:=tai_label(hp1).l;
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lastlabelhp:=hp1;
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end
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else
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begin
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{ when changing that code, be careful that }
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{ you don't use typed consts, which are }
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{ are also written to consts }
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{ currently, this is no problem, because }
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{ typed consts have no leading length or }
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{ they have no trailing zero }
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if (hp1.typ=ait_string) and (lastlabel<>nil) and
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(tai_string(hp1).len=mylength) then
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begin
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same_string:=true;
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{ if shortstring then check the length byte first and
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set the start index to 1 }
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case st_type of
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st_shortstring:
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begin
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if len=ord(tai_string(hp1).str[0]) then
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j:=1
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else
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same_string:=false;
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end;
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st_ansistring,
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st_widestring :
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begin
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{ before the string the following sequence must be found:
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<label>
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constsymbol <datalabel>
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const32 <len>
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const32 <len>
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const32 -1
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we must then return <label> to reuse
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}
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hp2:=tai(lastlabelhp.previous);
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if assigned(hp2) and
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(hp2.typ=ait_const_32bit) and
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(tai_const(hp2).value=-1) and
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assigned(hp2.previous) and
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(tai(hp2.previous).typ=ait_const_32bit) and
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(tai_const(hp2.previous).value=len) and
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assigned(hp2.previous.previous) and
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(tai(hp2.previous.previous).typ=ait_const_32bit) and
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(tai_const(hp2.previous.previous).value=len) and
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assigned(hp2.previous.previous.previous) and
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(tai(hp2.previous.previous.previous).typ=ait_const_symbol) and
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assigned(hp2.previous.previous.previous.previous) and
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(tai(hp2.previous.previous.previous.previous).typ=ait_label) then
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begin
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lastlabel:=tai_label(hp2.previous.previous.previous.previous).l;
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j:=0;
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end
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else
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same_string:=false;
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end;
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else
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same_string:=false;
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end;
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{ don't check if the length byte was already wrong }
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if same_string then
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begin
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for i:=0 to len do
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begin
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if tai_string(hp1).str[j]<>value_str[i] then
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begin
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same_string:=false;
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break;
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end;
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inc(j);
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end;
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end;
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{ found ? }
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if same_string then
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begin
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lab_str:=lastlabel;
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break;
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end;
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end;
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lastlabel:=nil;
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end;
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hp1:=tai(hp1.next);
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end;
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end;
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{ :-(, we must generate a new entry }
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if not assigned(lab_str) then
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begin
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objectlibrary.getdatalabel(lastlabel);
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lab_str:=lastlabel;
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if (cs_create_smart in aktmoduleswitches) then
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Consts.concat(Tai_cut.Create);
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consts.concat(tai_align.create(const_align(4)));
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Consts.concat(Tai_label.Create(lastlabel));
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{ generate an ansi string ? }
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case st_type of
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st_ansistring:
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begin
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{ an empty ansi string is nil! }
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if len=0 then
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Consts.concat(Tai_const.Create_32bit(0))
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else
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begin
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objectlibrary.getdatalabel(l1);
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objectlibrary.getdatalabel(l2);
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Consts.concat(Tai_label.Create(l2));
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Consts.concat(Tai_const_symbol.Create(l1));
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Consts.concat(Tai_const.Create_32bit(len));
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Consts.concat(Tai_const.Create_32bit(len));
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Consts.concat(Tai_const.Create_32bit(-1));
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Consts.concat(Tai_label.Create(l1));
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getmem(pc,len+2);
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move(value_str^,pc^,len);
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pc[len]:=#0;
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{ to overcome this problem we set the length explicitly }
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{ with the ending null char }
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Consts.concat(Tai_string.Create_length_pchar(pc,len+1));
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{ return the offset of the real string }
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lab_str:=l2;
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end;
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end;
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st_widestring:
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begin
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{ an empty wide string is nil! }
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if len=0 then
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Consts.concat(Tai_const.Create_32bit(0))
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else
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begin
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objectlibrary.getdatalabel(l1);
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objectlibrary.getdatalabel(l2);
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Consts.concat(Tai_label.Create(l2));
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Consts.concat(Tai_const_symbol.Create(l1));
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{ we use always UTF-16 coding for constants }
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{ at least for now }
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{ Consts.concat(Tai_const.Create_8bit(2)); }
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Consts.concat(Tai_const.Create_32bit(len));
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Consts.concat(Tai_const.Create_32bit(len));
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Consts.concat(Tai_const.Create_32bit(-1));
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Consts.concat(Tai_label.Create(l1));
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for i:=0 to len-1 do
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Consts.concat(Tai_const.Create_16bit(pcompilerwidestring(value_str)^.data[i]));
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{ terminating zero }
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Consts.concat(Tai_const.Create_16bit(0));
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{ return the offset of the real string }
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lab_str:=l2;
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end;
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end;
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st_shortstring:
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begin
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{ truncate strings larger than 255 chars }
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if len>255 then
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l:=255
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else
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l:=len;
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{ also length and terminating zero }
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getmem(pc,l+3);
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move(value_str^,pc[1],l+1);
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pc[0]:=chr(l);
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{ to overcome this problem we set the length explicitly }
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{ with the ending null char }
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pc[l+1]:=#0;
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Consts.concat(Tai_string.Create_length_pchar(pc,l+2));
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end;
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end;
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end;
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end;
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location.reference.symbol:=lab_str;
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end;
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{*****************************************************************************
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TCGSETCONSTNODE
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*****************************************************************************}
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procedure tcgsetconstnode.pass_2;
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var
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hp1 : tai;
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lastlabel : tasmlabel;
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i : longint;
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neededtyp : taitype;
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type
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setbytes=array[0..31] of byte;
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Psetbytes=^setbytes;
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begin
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{ small sets are loaded as constants }
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if tsetdef(resulttype.def).settype=smallset then
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begin
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location_reset(location,LOC_CONSTANT,OS_32);
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location.value:=PAWord(value_set)^;
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exit;
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end;
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location_reset(location,LOC_CREFERENCE,OS_NO);
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neededtyp:=ait_const_8bit;
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lastlabel:=nil;
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{ const already used ? }
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if not assigned(lab_set) then
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begin
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{ tries to found an old entry }
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hp1:=tai(Consts.first);
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while assigned(hp1) do
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begin
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if hp1.typ=ait_label then
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lastlabel:=tai_label(hp1).l
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else
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begin
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if (lastlabel<>nil) and (hp1.typ=neededtyp) then
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begin
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if (hp1.typ=ait_const_8bit) then
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begin
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{ compare normal set }
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i:=0;
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while assigned(hp1) and (i<32) do
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begin
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{$ifdef oldset}
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if tai_const(hp1).value<>value_set^[i] then
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{$else}
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if tai_const(hp1).value<>Psetbytes(value_set)^[i] then
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{$endif}
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break;
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inc(i);
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hp1:=tai(hp1.next);
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end;
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if i=32 then
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begin
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{ found! }
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lab_set:=lastlabel;
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break;
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end;
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{ leave when the end of consts is reached, so no
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hp1.next is done }
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if not assigned(hp1) then
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break;
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end
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else
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begin
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{ compare small set }
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if plongint(value_set)^=tai_const(hp1).value then
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begin
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{ found! }
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lab_set:=lastlabel;
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break;
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end;
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end;
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end;
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lastlabel:=nil;
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end;
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hp1:=tai(hp1.next);
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end;
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{ :-(, we must generate a new entry }
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if not assigned(lab_set) then
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begin
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objectlibrary.getdatalabel(lastlabel);
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lab_set:=lastlabel;
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if (cs_create_smart in aktmoduleswitches) then
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Consts.concat(Tai_cut.Create);
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consts.concat(tai_align.create(const_align(4)));
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Consts.concat(Tai_label.Create(lastlabel));
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if tsetdef(resulttype.def).settype=smallset then
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begin
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move(value_set^,i,sizeof(longint));
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Consts.concat(Tai_const.Create_32bit(i));
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end
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else
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begin
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for i:=0 to 31 do
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Consts.concat(Tai_const.Create_8bit(Psetbytes(value_set)^[i]));
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end;
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end;
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end;
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location.reference.symbol:=lab_set;
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end;
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{*****************************************************************************
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TCGNILNODE
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*****************************************************************************}
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procedure tcgnilnode.pass_2;
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begin
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location_reset(location,LOC_CONSTANT,OS_ADDR);
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location.value:=0;
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end;
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|
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{*****************************************************************************
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TCGPOINTERCONSTNODE
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*****************************************************************************}
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procedure tcgguidconstnode.pass_2;
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var
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tmplabel : TAsmLabel;
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i : integer;
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begin
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location_reset(location,LOC_CREFERENCE,OS_NO);
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{ label for GUID }
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objectlibrary.getdatalabel(tmplabel);
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consts.concat(tai_align.create(const_align(16)));
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consts.concat(Tai_label.Create(tmplabel));
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consts.concat(Tai_const.Create_32bit(value.D1));
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consts.concat(Tai_const.Create_16bit(value.D2));
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consts.concat(Tai_const.Create_16bit(value.D3));
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for i:=Low(value.D4) to High(value.D4) do
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consts.concat(Tai_const.Create_8bit(value.D4[i]));
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location.reference.symbol:=tmplabel;
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end;
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begin
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crealconstnode:=tcgrealconstnode;
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cordconstnode:=tcgordconstnode;
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cpointerconstnode:=tcgpointerconstnode;
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cstringconstnode:=tcgstringconstnode;
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csetconstnode:=tcgsetconstnode;
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cnilnode:=tcgnilnode;
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cguidconstnode:=tcgguidconstnode;
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end.
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{
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$Log$
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Revision 1.26 2003-01-05 13:36:53 florian
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* x86-64 compiles
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+ very basic support for float128 type (x86-64 only)
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Revision 1.25 2002/12/29 16:58:11 peter
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* write terminating 0 for widestring constants
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Revision 1.24 2002/12/07 14:10:21 carl
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* fix warnings by adding explicit typecasts
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Revision 1.23 2002/11/25 17:43:17 peter
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* splitted defbase in defutil,symutil,defcmp
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* merged isconvertable and is_equal into compare_defs(_ext)
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* made operator search faster by walking the list only once
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Revision 1.22 2002/11/09 15:36:50 carl
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* align all constants correctly (default of 4 size for real type constants)
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Revision 1.21 2002/10/06 21:01:50 peter
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* use tconstexpruint instead of qword
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Revision 1.20 2002/10/05 12:43:25 carl
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* fixes for Delphi 6 compilation
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(warning : Some features do not work under Delphi)
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Revision 1.19 2002/08/18 20:06:23 peter
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* inlining is now also allowed in interface
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* renamed write/load to ppuwrite/ppuload
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* tnode storing in ppu
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* nld,ncon,nbas are already updated for storing in ppu
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Revision 1.18 2002/08/11 14:32:26 peter
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* renamed current_library to objectlibrary
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Revision 1.17 2002/08/11 13:24:11 peter
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* saving of asmsymbols in ppu supported
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* asmsymbollist global is removed and moved into a new class
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tasmlibrarydata that will hold the info of a .a file which
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corresponds with a single module. Added librarydata to tmodule
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to keep the library info stored for the module. In the future the
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objectfiles will also be stored to the tasmlibrarydata class
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* all getlabel/newasmsymbol and friends are moved to the new class
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Revision 1.16 2002/08/10 17:15:06 jonas
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* endianess fix
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Revision 1.15 2002/07/23 12:34:30 daniel
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* Readded old set code. To use it define 'oldset'. Activated by default
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for ppc.
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Revision 1.14 2002/07/22 11:48:04 daniel
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* Sets are now internally sets.
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Revision 1.13 2002/07/20 11:57:53 florian
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* types.pas renamed to defbase.pas because D6 contains a types
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unit so this would conflicts if D6 programms are compiled
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+ Willamette/SSE2 instructions to assembler added
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Revision 1.12 2002/07/01 18:46:22 peter
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* internal linker
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* reorganized aasm layer
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Revision 1.11 2002/07/01 16:23:53 peter
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* cg64 patch
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* basics for currency
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* asnode updates for class and interface (not finished)
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Revision 1.10 2002/05/18 13:34:09 peter
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* readded missing revisions
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Revision 1.9 2002/05/16 19:46:37 carl
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+ defines.inc -> fpcdefs.inc to avoid conflicts if compiling by hand
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+ try to fix temp allocation (still in ifdef)
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+ generic constructor calls
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+ start of tassembler / tmodulebase class cleanup
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Revision 1.7 2002/04/04 19:05:57 peter
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* removed unused units
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* use tlocation.size in cg.a_*loc*() routines
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Revision 1.6 2002/04/02 17:11:28 peter
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* tlocation,treference update
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* LOC_CONSTANT added for better constant handling
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* secondadd splitted in multiple routines
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* location_force_reg added for loading a location to a register
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of a specified size
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* secondassignment parses now first the right and then the left node
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(this is compatible with Kylix). This saves a lot of push/pop especially
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with string operations
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* adapted some routines to use the new cg methods
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Revision 1.5 2002/03/31 20:26:34 jonas
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+ a_loadfpu_* and a_loadmm_* methods in tcg
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* register allocation is now handled by a class and is mostly processor
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independent (+rgobj.pas and i386/rgcpu.pas)
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* temp allocation is now handled by a class (+tgobj.pas, -i386\tgcpu.pas)
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* some small improvements and fixes to the optimizer
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* some register allocation fixes
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* some fpuvaroffset fixes in the unary minus node
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* push/popusedregisters is now called rg.save/restoreusedregisters and
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(for i386) uses temps instead of push/pop's when using -Op3 (that code is
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also better optimizable)
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* fixed and optimized register saving/restoring for new/dispose nodes
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* LOC_FPU locations now also require their "register" field to be set to
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R_ST, not R_ST0 (the latter is used for LOC_CFPUREGISTER locations only)
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- list field removed of the tnode class because it's not used currently
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and can cause hard-to-find bugs
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Revision 1.4 2002/02/26 09:12:39 jonas
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* fixed problem when compiling the compiler with Delphi (reported by
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"Luc Langlois" <L_Langlois@Videotron.ca>) (lo/hi don't work as in FPC
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when used with int64's under Delphi)
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}
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