freepascal.compiler/compiler/nadd.pas

{
    Copyright (c) 1998-2002 by Florian Klaempfl

    Type checking and register allocation for add nodes

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 ****************************************************************************
}
unit nadd;

{$i fpcdefs.inc}

{ define addstringopt}

interface

    uses
      node,symtype;

    type
       taddnode = class(tbinopnode)
          resultrealtype : ttype;
          constructor create(tt : tnodetype;l,r : tnode);override;
          function pass_1 : tnode;override;
          function det_resulttype:tnode;override;
          function simplify : tnode;override;
    {$ifdef state_tracking}
      function track_state_pass(exec_known:boolean):boolean;override;
    {$endif}
         protected
          { override the following if you want to implement }
          { parts explicitely in the code generator (JM)    }
          function first_addstring: tnode; virtual;
          function first_addset: tnode; virtual;
          { only implements "muln" nodes, the rest always has to be done in }
          { the code generator for performance reasons (JM)                 }
          function first_add64bitint: tnode; virtual;

          { override and return false if you can handle 32x32->64 }
          { bit multiplies directly in your code generator. If    }
          { this function is overridden to return false, you can  }
          { get multiplies with left/right both s32bit or u32bit, }
          { and resulttype of the muln s64bit or u64bit           }
          function use_generic_mul32to64: boolean; virtual;

          { This routine calls internal runtime library helpers
            for all floating point arithmetic in the case
            where the emulation switches is on. Otherwise
            returns nil, and everything must be done in
            the code generation phase.
          }
          function first_addfloat : tnode; virtual;
         private
           { checks whether a muln can be calculated as a 32bit }
           { * 32bit -> 64 bit                                  }
           function try_make_mul32to64: boolean;
       end;
       taddnodeclass = class of taddnode;

    var
       { caddnode is used to create nodes of the add type }
       { the virtual constructor allows to assign         }
       { another class type to caddnode => processor      }
       { specific node types can be created               }
       caddnode : taddnodeclass;

implementation

    uses
{$IFNDEF MACOS_USE_FAKE_SYSUTILS}
      sysutils,
{$ENDIF MACOS_USE_FAKE_SYSUTILS}
      globtype,systems,
      cutils,verbose,globals,widestr,
      symconst,symdef,symsym,symtable,defutil,defcmp,
      cgbase,
      htypechk,pass_1,
      nbas,nmat,ncnv,ncon,nset,nopt,ncal,ninl,nmem,nutils,
      {$ifdef state_tracking}
      nstate,
      {$endif}
      cpuinfo,procinfo;


{*****************************************************************************
                                TADDNODE
*****************************************************************************}

{$ifdef fpc}
{$maxfpuregisters 0}
{$endif fpc}

    function getbestreal(const t1,t2 : ttype) : ttype;
      const
        floatweight : array[tfloattype] of byte =
          (2,3,4,0,1,5);
      begin
        if t1.def.deftype=floatdef then
          begin
            result:=t1;
            if t2.def.deftype=floatdef then
              begin
                { when a comp or currency is used, use always the
                  best float type to calculate the result }
                if (tfloatdef(t2.def).typ in [s64comp,s64currency]) or
                  (tfloatdef(t2.def).typ in [s64comp,s64currency]) then
                  result:=pbestrealtype^
                else
                  if floatweight[tfloatdef(t2.def).typ]>floatweight[tfloatdef(t1.def).typ] then
                    result:=t2;
              end;
          end
        else if t2.def.deftype=floatdef then
          result:=t2
        else internalerror(200508061);
      end;


    constructor taddnode.create(tt : tnodetype;l,r : tnode);
      begin
         inherited create(tt,l,r);
      end;


    function taddnode.simplify : tnode;
      var
        t : tnode;
        lt,rt   : tnodetype;
        rd,ld   : tdef;
        rv,lv   : tconstexprint;
        rvd,lvd : bestreal;
        ws1,ws2 : pcompilerwidestring;
        concatstrings : boolean;
        c1,c2   : array[0..1] of char;
        s1,s2   : pchar;
        l1,l2   : longint;
        resultset : Tconstset;
        b       : boolean;
      begin
        result:=nil;
        { is one a real float, then both need to be floats, this
          need to be done before the constant folding so constant
          operation on a float and int are also handled }
        resultrealtype:=pbestrealtype^;
        if (right.resulttype.def.deftype=floatdef) or (left.resulttype.def.deftype=floatdef) then
         begin
           { when both floattypes are already equal then use that
             floattype for results }
           if (right.resulttype.def.deftype=floatdef) and
              (left.resulttype.def.deftype=floatdef) and
              (tfloatdef(left.resulttype.def).typ=tfloatdef(right.resulttype.def).typ) then
             resultrealtype:=left.resulttype
           { when there is a currency type then use currency, but
             only when currency is defined as float }
           else
            if (is_currency(right.resulttype.def) or
                is_currency(left.resulttype.def)) and
               ((s64currencytype.def.deftype = floatdef) or
                (nodetype <> slashn)) then
             begin
               resultrealtype:=s64currencytype;
               inserttypeconv(right,resultrealtype);
               inserttypeconv(left,resultrealtype);
             end
           else
            begin
              resultrealtype:=getbestreal(left.resulttype,right.resulttype);
              inserttypeconv(right,resultrealtype);
              inserttypeconv(left,resultrealtype);
            end;
         end;

        { If both operands are constant and there is a widechar
          or widestring then convert everything to widestring. This
          allows constant folding like char+widechar }
        if is_constnode(right) and is_constnode(left) and
           (is_widestring(right.resulttype.def) or
            is_widestring(left.resulttype.def) or
            is_widechar(right.resulttype.def) or
            is_widechar(left.resulttype.def)) then
          begin
            inserttypeconv(right,cwidestringtype);
            inserttypeconv(left,cwidestringtype);
          end;

        { load easier access variables }
        rd:=right.resulttype.def;
        ld:=left.resulttype.def;
        rt:=right.nodetype;
        lt:=left.nodetype;

        if (nodetype = slashn) and
           (((rt = ordconstn) and
             (tordconstnode(right).value = 0)) or
            ((rt = realconstn) and
             (trealconstnode(right).value_real = 0.0))) then
          begin
            if (cs_check_range in aktlocalswitches) or
               (cs_check_overflow in aktlocalswitches) then
               begin
                 result:=crealconstnode.create(1,pbestrealtype^);
                 Message(parser_e_division_by_zero);
                 exit;
               end;
          end;


        { both are int constants }
        if (
            (
             is_constintnode(left) and
             is_constintnode(right)
            ) or
            (
             is_constboolnode(left) and
             is_constboolnode(right) and
             (nodetype in [slashn,ltn,lten,gtn,gten,equaln,unequaln,andn,xorn,orn])
            ) or
            (
             is_constenumnode(left) and
             is_constenumnode(right) and
             allowenumop(nodetype))
            ) or
            (
             (lt = pointerconstn) and
             is_constintnode(right) and
             (nodetype in [addn,subn])
            ) or
            (
             (lt in [pointerconstn,niln]) and
             (rt in [pointerconstn,niln]) and
             (nodetype in [ltn,lten,gtn,gten,equaln,unequaln,subn])
            ) then
          begin
             t:=nil;
             { when comparing/substracting  pointers, make sure they are }
             { of the same  type (JM)                                    }
             if (lt = pointerconstn) and (rt = pointerconstn) then
              begin
                if not(cs_extsyntax in aktmoduleswitches) and
                   not(nodetype in [equaln,unequaln]) then
                  CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename)
                else
                  if (nodetype <> subn) and
                     is_voidpointer(rd) then
                    inserttypeconv(right,left.resulttype)
                  else if (nodetype <> subn) and
                          is_voidpointer(ld) then
                    inserttypeconv(left,right.resulttype)
                  else if not(equal_defs(ld,rd)) then
                    IncompatibleTypes(ld,rd);
               end
             else if (ld.deftype=enumdef) and (rd.deftype=enumdef) then
              begin
                if not(equal_defs(ld,rd)) then
                  inserttypeconv(right,left.resulttype);
               end;

             { load values }
             case lt of
               ordconstn:
                 lv:=tordconstnode(left).value;
               pointerconstn:
                 lv:=tpointerconstnode(left).value;
               niln:
                 lv:=0;
               else
                 internalerror(2002080202);
             end;
             case rt of
               ordconstn:
                 rv:=tordconstnode(right).value;
               pointerconstn:
                 rv:=tpointerconstnode(right).value;
               niln:
                 rv:=0;
               else
                 internalerror(2002080203);
             end;
             if (lt = pointerconstn) and
                (rt <> pointerconstn) then
               rv := rv * tpointerdef(left.resulttype.def).pointertype.def.size;
             if (rt = pointerconstn) and
                (lt <> pointerconstn) then
               lv := lv * tpointerdef(right.resulttype.def).pointertype.def.size;
             case nodetype of
               addn :
                 begin
                   {$ifopt Q-}
                     {$define OVERFLOW_OFF}
                     {$Q+}
                   {$endif}
                   try
                     if (lt=pointerconstn) then
                       t := cpointerconstnode.create(lv+rv,left.resulttype)
                     else
                       if is_integer(ld) then
                         t := genintconstnode(lv+rv)
                     else
                       t := cordconstnode.create(lv+rv,left.resulttype,(ld.deftype<>enumdef));
                   except
                     on E:EIntOverflow do
                       begin
                         Message(parser_e_arithmetic_operation_overflow);
                         { Recover }
                         t:=genintconstnode(0)
                       end;
                   end;
                   {$ifdef OVERFLOW_OFF}
                     {$Q-}
                     {$undef OVERFLOW_OFF}
                   {$endif}
                 end;
               subn :
                 begin
                   {$ifopt Q-}
                     {$define OVERFLOW_OFF}
                     {$Q+}
                   {$endif}
                   try
                     if (lt=pointerconstn) then
                       begin
                         { pointer-pointer results in an integer }
                         if (rt=pointerconstn) then
                           t := genintconstnode((lv-rv) div tpointerdef(ld).pointertype.def.size)
                         else
                           t := cpointerconstnode.create(lv-rv,left.resulttype);
                       end
                     else
                       begin
                         if is_integer(ld) then
                           t:=genintconstnode(lv-rv)
                         else
                           t:=cordconstnode.create(lv-rv,left.resulttype,(ld.deftype<>enumdef));
                       end;
                   except
                     on E:EIntOverflow do
                       begin
                         Message(parser_e_arithmetic_operation_overflow);
                         { Recover }
                         t:=genintconstnode(0)
                       end;
                   end;
                   {$ifdef OVERFLOW_OFF}
                     {$Q-}
                     {$undef OVERFLOW_OFF}
                   {$endif}
                 end;
               muln :
                 begin
                   {$ifopt Q-}
                     {$define OVERFLOW_OFF}
                     {$Q+}
                   {$endif}
                   try
                     if (torddef(ld).typ <> u64bit) or
                        (torddef(rd).typ <> u64bit) then
                       t:=genintconstnode(lv*rv)
                     else
                       t:=genintconstnode(int64(qword(lv)*qword(rv)));
                   except
                     on E:EIntOverflow do
                       begin
                         Message(parser_e_arithmetic_operation_overflow);
                         { Recover }
                         t:=genintconstnode(0)
                       end;
                   end;
                   {$ifdef OVERFLOW_OFF}
                     {$Q-}
                     {$undef OVERFLOW_OFF}
                   {$endif}
                 end;
               xorn :
                 if is_integer(ld) then
                   t:=genintconstnode(lv xor rv)
                 else
                   t:=cordconstnode.create(lv xor rv,left.resulttype,true);
               orn :
                 if is_integer(ld) then
                   t:=genintconstnode(lv or rv)
                 else
                   t:=cordconstnode.create(lv or rv,left.resulttype,true);
               andn :
                 if is_integer(ld) then
                   t:=genintconstnode(lv and rv)
                 else
                   t:=cordconstnode.create(lv and rv,left.resulttype,true);
               ltn :
                 t:=cordconstnode.create(ord(lv<rv),booltype,true);
               lten :
                 t:=cordconstnode.create(ord(lv<=rv),booltype,true);
               gtn :
                 t:=cordconstnode.create(ord(lv>rv),booltype,true);
               gten :
                 t:=cordconstnode.create(ord(lv>=rv),booltype,true);
               equaln :
                 t:=cordconstnode.create(ord(lv=rv),booltype,true);
               unequaln :
                 t:=cordconstnode.create(ord(lv<>rv),booltype,true);
               slashn :
                 begin
                   { int/int becomes a real }
                   rvd:=rv;
                   lvd:=lv;
                   t:=crealconstnode.create(lvd/rvd,resultrealtype);
                 end;
               else
                 begin
                   CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
                   t:=cnothingnode.create;
                 end;
             end;
             result:=t;
             exit;
          end;

      { both real constants ? }
        if (lt=realconstn) and (rt=realconstn) then
          begin
             lvd:=trealconstnode(left).value_real;
             rvd:=trealconstnode(right).value_real;
             case nodetype of
                addn :
                  t:=crealconstnode.create(lvd+rvd,resultrealtype);
                subn :
                  t:=crealconstnode.create(lvd-rvd,resultrealtype);
                muln :
                  t:=crealconstnode.create(lvd*rvd,resultrealtype);
                starstarn,
                caretn :
                  begin
                    if lvd<0 then
                     begin
                       Message(parser_e_invalid_float_operation);
                       t:=crealconstnode.create(0,resultrealtype);
                     end
                    else if lvd=0 then
                      t:=crealconstnode.create(1.0,resultrealtype)
                    else
                      t:=crealconstnode.create(exp(ln(lvd)*rvd),resultrealtype);
                  end;
                slashn :
                  t:=crealconstnode.create(lvd/rvd,resultrealtype);
                ltn :
                  t:=cordconstnode.create(ord(lvd<rvd),booltype,true);
                lten :
                  t:=cordconstnode.create(ord(lvd<=rvd),booltype,true);
                gtn :
                  t:=cordconstnode.create(ord(lvd>rvd),booltype,true);
                gten :
                  t:=cordconstnode.create(ord(lvd>=rvd),booltype,true);
                equaln :
                  t:=cordconstnode.create(ord(lvd=rvd),booltype,true);
                unequaln :
                  t:=cordconstnode.create(ord(lvd<>rvd),booltype,true);
                else
                  begin
                    CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
                    t:=cnothingnode.create;
                  end;
             end;
             result:=t;
             exit;
          end;

        { first, we handle widestrings, so we can check later for }
        { stringconstn only                                       }

        { widechars are converted above to widestrings too }
        { this isn't veryy efficient, but I don't think    }
        { that it does matter that much (FK)               }
        if (lt=stringconstn) and (rt=stringconstn) and
          (tstringconstnode(left).cst_type=cst_widestring) and
          (tstringconstnode(right).cst_type=cst_widestring) then
          begin
             initwidestring(ws1);
             initwidestring(ws2);
             copywidestring(pcompilerwidestring(tstringconstnode(left).value_str),ws1);
             copywidestring(pcompilerwidestring(tstringconstnode(right).value_str),ws2);
             case nodetype of
                addn :
                  begin
                     concatwidestrings(ws1,ws2);
                     t:=cstringconstnode.createwstr(ws1);
                  end;
                ltn :
                  t:=cordconstnode.create(byte(comparewidestrings(ws1,ws2)<0),booltype,true);
                lten :
                  t:=cordconstnode.create(byte(comparewidestrings(ws1,ws2)<=0),booltype,true);
                gtn :
                  t:=cordconstnode.create(byte(comparewidestrings(ws1,ws2)>0),booltype,true);
                gten :
                  t:=cordconstnode.create(byte(comparewidestrings(ws1,ws2)>=0),booltype,true);
                equaln :
                  t:=cordconstnode.create(byte(comparewidestrings(ws1,ws2)=0),booltype,true);
                unequaln :
                  t:=cordconstnode.create(byte(comparewidestrings(ws1,ws2)<>0),booltype,true);
                else
                  begin
                    CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
                    t:=cnothingnode.create;
                  end;
             end;
             donewidestring(ws1);
             donewidestring(ws2);
             result:=t;
             exit;
          end;

        { concating strings ? }
        concatstrings:=false;

        if (lt=ordconstn) and (rt=ordconstn) and
           is_char(ld) and is_char(rd) then
          begin
             c1[0]:=char(byte(tordconstnode(left).value));
             c1[1]:=#0;
             l1:=1;
             c2[0]:=char(byte(tordconstnode(right).value));
             c2[1]:=#0;
             l2:=1;
             s1:=@c1;
             s2:=@c2;
             concatstrings:=true;
          end
        else if (lt=stringconstn) and (rt=ordconstn) and is_char(rd) then
          begin
             s1:=tstringconstnode(left).value_str;
             l1:=tstringconstnode(left).len;
             c2[0]:=char(byte(tordconstnode(right).value));
             c2[1]:=#0;
             s2:=@c2;
             l2:=1;
             concatstrings:=true;
          end
        else if (lt=ordconstn) and (rt=stringconstn) and is_char(ld) then
          begin
             c1[0]:=char(byte(tordconstnode(left).value));
             c1[1]:=#0;
             l1:=1;
             s1:=@c1;
             s2:=tstringconstnode(right).value_str;
             l2:=tstringconstnode(right).len;
             concatstrings:=true;
          end
        else if (lt=stringconstn) and (rt=stringconstn) then
          begin
             s1:=tstringconstnode(left).value_str;
             l1:=tstringconstnode(left).len;
             s2:=tstringconstnode(right).value_str;
             l2:=tstringconstnode(right).len;
             concatstrings:=true;
          end;
        if concatstrings then
          begin
             case nodetype of
                addn :
                  t:=cstringconstnode.createpchar(concatansistrings(s1,s2,l1,l2),l1+l2);
                ltn :
                  t:=cordconstnode.create(byte(compareansistrings(s1,s2,l1,l2)<0),booltype,true);
                lten :
                  t:=cordconstnode.create(byte(compareansistrings(s1,s2,l1,l2)<=0),booltype,true);
                gtn :
                  t:=cordconstnode.create(byte(compareansistrings(s1,s2,l1,l2)>0),booltype,true);
                gten :
                  t:=cordconstnode.create(byte(compareansistrings(s1,s2,l1,l2)>=0),booltype,true);
                equaln :
                  t:=cordconstnode.create(byte(compareansistrings(s1,s2,l1,l2)=0),booltype,true);
                unequaln :
                  t:=cordconstnode.create(byte(compareansistrings(s1,s2,l1,l2)<>0),booltype,true);
                else
                  begin
                    CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
                    t:=cnothingnode.create;
                  end;
             end;
             result:=t;
             exit;
          end;

        { set constant evaluation }
        if (right.nodetype=setconstn) and
           not assigned(tsetconstnode(right).left) and
           (left.nodetype=setconstn) and
           not assigned(tsetconstnode(left).left) then
          begin
             { check if size adjusting is needed, only for left
               to right as the other way is checked in the typeconv }
             if (tsetdef(right.resulttype.def).settype=smallset) and
                (tsetdef(left.resulttype.def).settype<>smallset) then
               right.resulttype.setdef(tsetdef.create(tsetdef(right.resulttype.def).elementtype,255));
             { check base types }
             inserttypeconv(left,right.resulttype);

             if codegenerror then
              begin
                { recover by only returning the left part }
                result:=left;
                left:=nil;
                exit;
              end;
             case nodetype of
               addn :
                 begin
                   resultset:=tsetconstnode(right).value_set^ + tsetconstnode(left).value_set^;
                   t:=csetconstnode.create(@resultset,left.resulttype);
                 end;
                muln :
                  begin
                    resultset:=tsetconstnode(right).value_set^ * tsetconstnode(left).value_set^;
                    t:=csetconstnode.create(@resultset,left.resulttype);
                  end;
               subn :
                  begin
                    resultset:=tsetconstnode(left).value_set^ - tsetconstnode(right).value_set^;
                            t:=csetconstnode.create(@resultset,left.resulttype);
                  end;
               symdifn :
                  begin
                    resultset:=tsetconstnode(right).value_set^ >< tsetconstnode(left).value_set^;
                        t:=csetconstnode.create(@resultset,left.resulttype);
                  end;
               unequaln :
                  begin
                    b:=tsetconstnode(right).value_set^ <> tsetconstnode(left).value_set^;
                    t:=cordconstnode.create(byte(b),booltype,true);
                  end;
               equaln :
                  begin
                    b:=tsetconstnode(right).value_set^ = tsetconstnode(left).value_set^;
                    t:=cordconstnode.create(byte(b),booltype,true);
                  end;
               lten :
                  begin
                    b:=tsetconstnode(left).value_set^ <= tsetconstnode(right).value_set^;
                    t:=cordconstnode.create(byte(b),booltype,true);
                  end;
               gten :
                  begin
                    b:=tsetconstnode(left).value_set^ >= tsetconstnode(right).value_set^;
                    t:=cordconstnode.create(byte(b),booltype,true);
                  end;
                else
                  begin
                    CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
                    t:=cnothingnode.create;
                  end;
             end;
             result:=t;
             exit;
          end;

      end;


    function taddnode.det_resulttype:tnode;
      var
        hp      : tnode;
        lt,rt   : tnodetype;
        rd,ld   : tdef;
        htype   : ttype;
        ot      : tnodetype;
        hsym    : tfieldvarsym;
        i       : longint;
        strtype : tstringtype;
        b       : boolean;
{$ifdef state_tracking}
        factval : Tnode;
        change  : boolean;
{$endif}

      begin
         result:=nil;
         { first do the two subtrees }
         resulttypepass(left);
         resulttypepass(right);
         { both left and right need to be valid }
         set_varstate(left,vs_read,[vsf_must_be_valid]);
         set_varstate(right,vs_read,[vsf_must_be_valid]);
         if codegenerror then
           exit;

         { tp procvar support }
         maybe_call_procvar(left,true);
         maybe_call_procvar(right,true);

         { convert array constructors to sets, because there is no other operator
           possible for array constructors }
         if is_array_constructor(left.resulttype.def) then
          begin
            arrayconstructor_to_set(left);
            resulttypepass(left);
          end;
         if is_array_constructor(right.resulttype.def) then
          begin
            arrayconstructor_to_set(right);
            resulttypepass(right);
          end;

         { allow operator overloading }
         hp:=self;
         if isbinaryoverloaded(hp) then
           begin
              result:=hp;
              exit;
           end;
         { Stop checking when an error was found in the operator checking }
         if codegenerror then
           begin
             result:=cerrornode.create;
             exit;
           end;


         { Kylix allows enum+ordconstn in an enum declaration (blocktype
           is bt_type), we need to do the conversion here before the
           constant folding }
         if (m_delphi in aktmodeswitches) and
            (blocktype=bt_type) then
          begin
            if (left.resulttype.def.deftype=enumdef) and
               (right.resulttype.def.deftype=orddef) then
             begin
               { insert explicit typecast to default signed int }
               left:=ctypeconvnode.create_internal(left,sinttype);
               resulttypepass(left);
             end
            else
             if (left.resulttype.def.deftype=orddef) and
                (right.resulttype.def.deftype=enumdef) then
              begin
                { insert explicit typecast to default signed int }
                right:=ctypeconvnode.create_internal(right,sinttype);
                resulttypepass(right);
              end;
          end;

         result:=simplify;
         if assigned(result) then
           exit;

        { load easier access variables }
        rd:=right.resulttype.def;
        ld:=left.resulttype.def;
        rt:=right.nodetype;
        lt:=left.nodetype;

         { but an int/int gives real/real! }
         if nodetype=slashn then
          begin
            if is_currency(left.resulttype.def) and
               is_currency(right.resulttype.def) then
              { In case of currency, converting to float means dividing by 10000 }
              { However, since this is already a division, both divisions by     }
              { 10000 are eliminated when we divide the results -> we can skip   }
              { them.                                                            }
              if s64currencytype.def.deftype = floatdef then
                begin
                  { there's no s64comptype or so, how do we avoid the type conversion?
                  left.resulttype := s64comptype;
                  right.resulttype := s64comptype; }
                end
              else
                begin
                  left.resulttype := s64inttype;
                  right.resulttype := s64inttype;
                end
            else if (left.resulttype.def.deftype <> floatdef) and
               (right.resulttype.def.deftype <> floatdef) then
              CGMessage(type_h_use_div_for_int);
            inserttypeconv(right,resultrealtype);
            inserttypeconv(left,resultrealtype);
          end

         { if both are orddefs then check sub types }
         else if (ld.deftype=orddef) and (rd.deftype=orddef) then
           begin
             { optimize multiplacation by a power of 2 }
             if not(cs_check_overflow in aktlocalswitches) and
                (nodetype = muln) and
                (((left.nodetype = ordconstn) and
                  ispowerof2(tordconstnode(left).value,i)) or
                 ((right.nodetype = ordconstn) and
                  ispowerof2(tordconstnode(right).value,i))) then
               begin
                 if left.nodetype = ordconstn then
                   begin
                     tordconstnode(left).value := i;
                     result := cshlshrnode.create(shln,right,left);
                   end
                 else
                   begin
                     tordconstnode(right).value := i;
                     result := cshlshrnode.create(shln,left,right);
                   end;
                 left := nil;
                 right := nil;
                 exit;
               end;

              { set for & and | operations in macpas mode: they only work on }
              { booleans, and always short circuit evaluation                }
              if (nf_short_bool in flags) then
                begin
                  if not is_boolean(ld) then
                    begin
                      inserttypeconv(left,booltype);
                      ld := left.resulttype.def;
                    end;
                  if not is_boolean(rd) then
                    begin
                      inserttypeconv(right,booltype);
                      rd := right.resulttype.def;
                    end;
                end;

             { 2 booleans? Make them equal to the largest boolean }
             if (is_boolean(ld) and is_boolean(rd)) or
                (nf_short_bool in flags) then
              begin
                if torddef(left.resulttype.def).size>torddef(right.resulttype.def).size then
                 begin
                   right:=ctypeconvnode.create_internal(right,left.resulttype);
                   ttypeconvnode(right).convtype:=tc_bool_2_bool;
                   resulttypepass(right);
                 end
                else if torddef(left.resulttype.def).size<torddef(right.resulttype.def).size then
                 begin
                   left:=ctypeconvnode.create_internal(left,right.resulttype);
                   ttypeconvnode(left).convtype:=tc_bool_2_bool;
                   resulttypepass(left);
                 end;
                case nodetype of
                  xorn,
                  ltn,
                  lten,
                  gtn,
                  gten,
                  andn,
                  orn:
                    begin
                    end;
                  unequaln,
                  equaln:
                    begin
                      if not(cs_full_boolean_eval in aktlocalswitches) or
                         (nf_short_bool in flags) then
                       begin
                         { Remove any compares with constants }
                         if (left.nodetype=ordconstn) then
                          begin
                            hp:=right;
                            b:=(tordconstnode(left).value<>0);
                            ot:=nodetype;
                            left.free;
                            left:=nil;
                            right:=nil;
                            if (not(b) and (ot=equaln)) or
                               (b and (ot=unequaln)) then
                             begin
                               hp:=cnotnode.create(hp);
                             end;
                            result:=hp;
                            exit;
                          end;
                         if (right.nodetype=ordconstn) then
                          begin
                            hp:=left;
                            b:=(tordconstnode(right).value<>0);
                            ot:=nodetype;
                            right.free;
                            right:=nil;
                            left:=nil;
                            if (not(b) and (ot=equaln)) or
                               (b and (ot=unequaln)) then
                             begin
                               hp:=cnotnode.create(hp);
                             end;
                            result:=hp;
                            exit;
                          end;
                       end;
                    end;
                  else
                    begin
                      CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
                      result:=cnothingnode.create;
                      exit;
                    end;
                end;
              end
             { Both are chars? }
             else if is_char(rd) and is_char(ld) then
               begin
                 if nodetype=addn then
                  begin
                    resulttype:=cshortstringtype;
                    if not(is_constcharnode(left) and is_constcharnode(right)) then
                     begin
                       inserttypeconv(left,cshortstringtype);
{$ifdef addstringopt}
                       hp := genaddsstringcharoptnode(self);
                       result := hp;
                       exit;
{$endif addstringopt}
                     end;
                  end;
               end
             { There is a widechar? }
             else if is_widechar(rd) or is_widechar(ld) then
               begin
                 { widechar+widechar gives widestring }
                 if nodetype=addn then
                   begin
                     inserttypeconv(left,cwidestringtype);
                     if (torddef(rd).typ<>uwidechar) then
                       inserttypeconv(right,cwidechartype);
                     resulttype:=cwidestringtype;
                   end
                 else
                   begin
                     if (torddef(ld).typ<>uwidechar) then
                       inserttypeconv(left,cwidechartype);
                     if (torddef(rd).typ<>uwidechar) then
                       inserttypeconv(right,cwidechartype);
                   end;
               end
             { is there a currency type ? }
             else if ((torddef(rd).typ=scurrency) or (torddef(ld).typ=scurrency)) then
               begin
                  if (torddef(ld).typ<>scurrency) then
                   inserttypeconv(left,s64currencytype);
                  if (torddef(rd).typ<>scurrency) then
                   inserttypeconv(right,s64currencytype);
               end
             { and,or,xor work on bit patterns and don't care
               about the sign of integers }
             else if (nodetype in [andn,orn,xorn]) and
                     is_integer(ld) and is_integer(rd) then
               begin
                 if rd.size>ld.size then
                   inserttypeconv_internal(left,right.resulttype)
                 else
                   inserttypeconv_internal(right,left.resulttype);
               end
             { is there a signed 64 bit type ? }
             else if ((torddef(rd).typ=s64bit) or (torddef(ld).typ=s64bit)) then
               begin
                  if (torddef(ld).typ<>s64bit) then
                   inserttypeconv(left,s64inttype);
                  if (torddef(rd).typ<>s64bit) then
                   inserttypeconv(right,s64inttype);
               end
             { is there a unsigned 64 bit type ? }
             else if ((torddef(rd).typ=u64bit) or (torddef(ld).typ=u64bit)) then
               begin
                  if (torddef(ld).typ<>u64bit) then
                   inserttypeconv(left,u64inttype);
                  if (torddef(rd).typ<>u64bit) then
                   inserttypeconv(right,u64inttype);
               end
             { 64 bit cpus do calculations always in 64 bit }
{$ifndef cpu64bit}
             { is there a cardinal? }
             else if ((torddef(rd).typ=u32bit) or (torddef(ld).typ=u32bit)) then
               begin
                 { convert positive constants to u32bit }
                 if (torddef(ld).typ<>u32bit) and
                    is_constintnode(left) and
                    (tordconstnode(left).value >= 0) then
                   inserttypeconv(left,u32inttype);
                 if (torddef(rd).typ<>u32bit) and
                    is_constintnode(right) and
                    (tordconstnode(right).value >= 0) then
                   inserttypeconv(right,u32inttype);
                 { when one of the operand is signed perform
                   the operation in 64bit, can't use rd/ld here because there
                   could be already typeconvs inserted }
                 if is_signed(left.resulttype.def) or
                    is_signed(right.resulttype.def) then
                   begin
                     CGMessage(type_w_mixed_signed_unsigned);
                     inserttypeconv(left,s64inttype);
                     inserttypeconv(right,s64inttype);
                   end
                 else
                   begin
                     if (torddef(left.resulttype.def).typ<>u32bit) then
                       inserttypeconv(left,u32inttype);
                     if (torddef(right.resulttype.def).typ<>u32bit) then
                       inserttypeconv(right,u32inttype);
                   end;
               end
{$endif cpu64bit}
             { generic ord conversion is sinttype }
             else
               begin
                 { if the left or right value is smaller than the normal
                   type sinttype and is unsigned, and the other value
                   is a constant < 0, the result will always be false/true
                   for equal / unequal nodes.
                 }
                 if (
                      { left : unsigned ordinal var, right : < 0 constant }
                      (
                       ((is_signed(ld)=false) and (is_constintnode(left) =false)) and
                       ((is_constintnode(right)) and (tordconstnode(right).value < 0))
                      ) or
                      { right : unsigned ordinal var, left : < 0 constant }
                      (
                       ((is_signed(rd)=false) and (is_constintnode(right) =false)) and
                       ((is_constintnode(left)) and (tordconstnode(left).value < 0))
                      )
                    )  then
                    begin
                      if nodetype = equaln then
                         CGMessage(type_w_signed_unsigned_always_false)
                      else
                      if nodetype = unequaln then
                         CGMessage(type_w_signed_unsigned_always_true)
                      else
                      if (is_constintnode(left) and (nodetype in [ltn,lten])) or
                         (is_constintnode(right) and (nodetype in [gtn,gten])) then
                         CGMessage(type_w_signed_unsigned_always_true)
                      else
                      if (is_constintnode(right) and (nodetype in [ltn,lten])) or
                         (is_constintnode(left) and (nodetype in [gtn,gten])) then
                         CGMessage(type_w_signed_unsigned_always_false);
                    end;

                 { When there is a signed type or there is a minus operation
                   we convert to signed int. Otherwise (both are unsigned) we keep
                   the result also unsigned. This is compatible with Delphi (PFV) }
                 if is_signed(ld) or
                    is_signed(rd) or
                    (nodetype=subn) then
                   begin
                     inserttypeconv(right,sinttype);
                     inserttypeconv(left,sinttype);
                   end
                 else
                   begin
                     inserttypeconv(right,uinttype);
                     inserttypeconv(left,uinttype);
                   end;
               end;
           end

         { if both are floatdefs, conversion is already done before constant folding }
         else if (ld.deftype=floatdef) then
           begin
             if not(nodetype in [addn,subn,muln,slashn,equaln,unequaln,ltn,lten,gtn,gten]) then
               CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
           end

         { left side a setdef, must be before string processing,
           else array constructor can be seen as array of char (PFV) }
         else if (ld.deftype=setdef) then
          begin
            { trying to add a set element? }
            if (nodetype=addn) and (rd.deftype<>setdef) then
             begin
               if (rt=setelementn) then
                begin
                  if not(equal_defs(tsetdef(ld).elementtype.def,rd)) then
                   CGMessage(type_e_set_element_are_not_comp);
                end
               else
                CGMessage(type_e_mismatch)
             end
            else
             begin
               if not(nodetype in [addn,subn,symdifn,muln,equaln,unequaln,lten,gten]) then
                CGMessage(type_e_set_operation_unknown);
               { right def must be a also be set }
               if (rd.deftype<>setdef) or not(equal_defs(rd,ld)) then
                CGMessage(type_e_set_element_are_not_comp);
             end;

            { ranges require normsets }
            if (tsetdef(ld).settype=smallset) and
               (rt=setelementn) and
               assigned(tsetelementnode(right).right) then
             begin
               { generate a temporary normset def, it'll be destroyed
                 when the symtable is unloaded }
               htype.setdef(tsetdef.create(tsetdef(ld).elementtype,255));
               inserttypeconv(left,htype);
             end;

            { if the right side is also a setdef then the settype must
              be the same as the left setdef }
            if (rd.deftype=setdef) and
               (tsetdef(ld).settype<>tsetdef(rd).settype) then
             begin
               { when right is a normset we need to typecast both
                 to normsets }
               if (tsetdef(rd).settype=normset) then
                inserttypeconv(left,right.resulttype)
               else
                inserttypeconv(right,left.resulttype);
             end;
          end
         { pointer comparision and subtraction }
         else if (
                  (rd.deftype=pointerdef) and (ld.deftype=pointerdef)
                 ) or
                 { compare/add pchar to variable (not stringconst) char arrays
                   by addresses like BP/Delphi }
                 (
                  (nodetype in [equaln,unequaln,subn,addn]) and
                  (
                   ((is_pchar(ld) or (lt=niln)) and is_chararray(rd) and (rt<>stringconstn)) or
                   ((is_pchar(rd) or (rt=niln)) and is_chararray(ld) and (lt<>stringconstn))
                  )
                 ) then
          begin
            { convert char array to pointer }
            if is_chararray(rd) then
              begin
                inserttypeconv(right,charpointertype);
                rd:=right.resulttype.def;
              end
            else if is_chararray(ld) then
              begin
                inserttypeconv(left,charpointertype);
                ld:=left.resulttype.def;
              end;

            case nodetype of
               equaln,unequaln :
                 begin
                    if is_voidpointer(right.resulttype.def) then
                      inserttypeconv(right,left.resulttype)
                    else if is_voidpointer(left.resulttype.def) then
                      inserttypeconv(left,right.resulttype)
                    else if not(equal_defs(ld,rd)) then
                      IncompatibleTypes(ld,rd);
                    { now that the type checking is done, convert both to charpointer, }
                    { because methodpointers are 8 bytes even though only the first 4  }
                    { bytes must be compared. This can happen here if we are in        }
                    { TP/Delphi mode, because there @methodpointer = voidpointer (but  }
                    { a voidpointer of 8 bytes). A conversion to voidpointer would be  }
                    { optimized away, since the result already was a voidpointer, so   }
                    { use a charpointer instead (JM)                                   }
                    inserttypeconv_internal(left,charpointertype);
                    inserttypeconv_internal(right,charpointertype);
                 end;
               ltn,lten,gtn,gten:
                 begin
                    if (cs_extsyntax in aktmoduleswitches) then
                     begin
                       if is_voidpointer(right.resulttype.def) then
                        inserttypeconv(right,left.resulttype)
                       else if is_voidpointer(left.resulttype.def) then
                        inserttypeconv(left,right.resulttype)
                       else if not(equal_defs(ld,rd)) then
                        IncompatibleTypes(ld,rd);
                     end
                    else
                     CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
                 end;
               subn:
                 begin
                    if (cs_extsyntax in aktmoduleswitches) then
                      begin
                        if is_voidpointer(right.resulttype.def) then
                          inserttypeconv(right,left.resulttype)
                        else if is_voidpointer(left.resulttype.def) then
                          inserttypeconv(left,right.resulttype)
                        else if not(equal_defs(ld,rd)) then
                          IncompatibleTypes(ld,rd);
                      end
                    else
                      CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);

                    if not(nf_has_pointerdiv in flags) and
                      (tpointerdef(rd).pointertype.def.size>1) then
                      begin
                        hp:=getcopy;
                        include(hp.flags,nf_has_pointerdiv);
                        result:=cmoddivnode.create(divn,hp,cordconstnode.create(tpointerdef(rd).pointertype.def.size,sinttype,false));
                      end;
                    resulttype:=sinttype;
                    exit;
                 end;
               addn:
                 begin
                    if (cs_extsyntax in aktmoduleswitches) then
                     begin
                       if is_voidpointer(right.resulttype.def) then
                         inserttypeconv(right,left.resulttype)
                       else if is_voidpointer(left.resulttype.def) then
                         inserttypeconv(left,right.resulttype)
                       else if not(equal_defs(ld,rd)) then
                         IncompatibleTypes(ld,rd);
                     end
                    else
                      CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
                    resulttype:=sinttype;
                    exit;
                 end;
               else
                 CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
            end;
          end

         { is one of the operands a string?,
           chararrays are also handled as strings (after conversion), also take
           care of chararray+chararray and chararray+char.
           Note: Must be done after pointerdef+pointerdef has been checked, else
           pchar is converted to string }
         else if (rd.deftype=stringdef) or
                 (ld.deftype=stringdef) or
                 ((is_pchar(rd) or is_chararray(rd) or is_char(rd) or is_open_chararray(rd) or
                   is_pwidechar(rd) or is_widechararray(rd) or is_widechar(rd) or is_open_widechararray(rd)) and
                  (is_pchar(ld) or is_chararray(ld) or is_char(ld) or is_open_chararray(ld) or
                   is_pwidechar(ld) or is_widechararray(ld) or is_widechar(ld) or is_open_widechararray(ld))) then
          begin
            if (nodetype in [addn,equaln,unequaln,lten,gten,ltn,gtn]) then
              begin
                { Is there a widestring? }
                if is_widestring(rd) or is_widestring(ld) or
                   is_pwidechar(rd) or is_widechararray(rd) or is_widechar(rd) or is_open_widechararray(rd) or
                   is_pwidechar(ld) or is_widechararray(ld) or is_widechar(ld) or is_open_widechararray(ld) then
                  strtype:= st_widestring
                else
                  if is_ansistring(rd) or is_ansistring(ld) or
                     ((cs_ansistrings in aktlocalswitches) and
                     //todo: Move some of this to longstring's then they are implemented?
                      (
                       is_pchar(rd) or (is_chararray(rd) and (rd.size > 255)) or is_open_chararray(rd) or
                       is_pchar(ld) or (is_chararray(ld) and (ld.size > 255)) or is_open_chararray(ld)
                      )
                     ) then
                    strtype:= st_ansistring
                else
                  if is_longstring(rd) or is_longstring(ld) then
                    strtype:= st_longstring
                else
                  begin
                    {$warning todo: add a warning/hint here if one converting a too large array}
                    { nodes is PChar, array [with size > 255] or OpenArrayOfChar.
                      Note: Delphi halts with error if "array [0..xx] of char"
                           is assigned to ShortString and string length is less
                           then array size }
                    strtype:= st_shortstring;
                  end;

                // Now convert nodes to common string type
                case strtype of
                  st_widestring :
                    begin
                      if not(is_widestring(rd)) then
                        inserttypeconv(right,cwidestringtype);
                      if not(is_widestring(ld)) then
                        inserttypeconv(left,cwidestringtype);
                    end;
                  st_ansistring :
                    begin
                      if not(is_ansistring(rd)) then
                        inserttypeconv(right,cansistringtype);
                      if not(is_ansistring(ld)) then
                        inserttypeconv(left,cansistringtype);
                    end;
                  st_longstring :
                    begin
                      if not(is_longstring(rd)) then
                        inserttypeconv(right,clongstringtype);
                      if not(is_longstring(ld)) then
                        inserttypeconv(left,clongstringtype);
                     end;
                   st_shortstring :
                     begin
                       if not(is_shortstring(ld)) then
                         inserttypeconv(left,cshortstringtype);
                       { don't convert char, that can be handled by the optimized node }
                       if not(is_shortstring(rd) or is_char(rd)) then
                         inserttypeconv(right,cshortstringtype);
                     end;
                   else
                     internalerror(2005101);
                end;
              end
            else
              CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
          end

         { class or interface equation }
         else if is_class_or_interface(rd) or is_class_or_interface(ld) then
          begin
            if (nodetype in [equaln,unequaln]) then
              begin
                if is_class_or_interface(rd) and is_class_or_interface(ld) then
                 begin
                   if tobjectdef(rd).is_related(tobjectdef(ld)) then
                    inserttypeconv(right,left.resulttype)
                   else
                    inserttypeconv(left,right.resulttype);
                 end
                else if is_class_or_interface(rd) then
                  inserttypeconv(left,right.resulttype)
                else
                  inserttypeconv(right,left.resulttype);
              end
            else
              CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
          end

         else if (rd.deftype=classrefdef) and (ld.deftype=classrefdef) then
          begin
            if (nodetype in [equaln,unequaln]) then
              begin
                if tobjectdef(tclassrefdef(rd).pointertype.def).is_related(
                        tobjectdef(tclassrefdef(ld).pointertype.def)) then
                  inserttypeconv(right,left.resulttype)
                else
                  inserttypeconv(left,right.resulttype);
              end
            else
              CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
          end

         { allows comperasion with nil pointer }
         else if is_class_or_interface(rd) or (rd.deftype=classrefdef) then
          begin
            if (nodetype in [equaln,unequaln]) then
              inserttypeconv(left,right.resulttype)
            else
              CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
          end

         else if is_class_or_interface(ld) or (ld.deftype=classrefdef) then
          begin
            if (nodetype in [equaln,unequaln]) then
              inserttypeconv(right,left.resulttype)
            else
              CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
          end

       { support procvar=nil,procvar<>nil }
         else if ((ld.deftype=procvardef) and (rt=niln)) or
                 ((rd.deftype=procvardef) and (lt=niln)) then
          begin
            if not(nodetype in [equaln,unequaln]) then
              CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
            { find proc field in methodpointer record }
            hsym:=tfieldvarsym(trecorddef(methodpointertype.def).symtable.search('proc'));
            if not assigned(hsym) then
              internalerror(200412043);
            { For methodpointers compare only tmethodpointer.proc }
            if (rd.deftype=procvardef) and
               (not tprocvardef(rd).is_addressonly) then
              begin
                right:=csubscriptnode.create(
                           hsym,
                           ctypeconvnode.create_internal(right,methodpointertype));
               end;
            if (ld.deftype=procvardef) and
               (not tprocvardef(ld).is_addressonly) then
              begin
                left:=csubscriptnode.create(
                          hsym,
                          ctypeconvnode.create_internal(left,methodpointertype));
              end;
          end

       { support dynamicarray=nil,dynamicarray<>nil }
         else if (is_dynamic_array(ld) and (rt=niln)) or
                 (is_dynamic_array(rd) and (lt=niln)) or
                 (is_dynamic_array(ld) and is_dynamic_array(rd)) then
          begin
            if not(nodetype in [equaln,unequaln]) then
              CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
          end

{$ifdef SUPPORT_MMX}
       { mmx support, this must be before the zero based array
         check }
         else if (cs_mmx in aktlocalswitches) and
                 is_mmx_able_array(ld) and
                 is_mmx_able_array(rd) and
                 equal_defs(ld,rd) then
            begin
              case nodetype of
                addn,subn,xorn,orn,andn:
                  ;
                { mul is a little bit restricted }
                muln:
                  if not(mmx_type(ld) in [mmxu16bit,mmxs16bit,mmxfixed16]) then
                    CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
                else
                  CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
              end;
            end
{$endif SUPPORT_MMX}

         { this is a little bit dangerous, also the left type }
         { pointer to should be checked! This broke the mmx support      }
         else if (rd.deftype=pointerdef) or
                 (is_zero_based_array(rd) and (rt<>stringconstn)) then
          begin
            if is_zero_based_array(rd) then
              begin
                resulttype.setdef(tpointerdef.create(tarraydef(rd).elementtype));
                inserttypeconv(right,resulttype);
              end
            else
              resulttype:=right.resulttype;
            inserttypeconv(left,sinttype);
            if nodetype=addn then
              begin
                if not(cs_extsyntax in aktmoduleswitches) or
                   (not(is_pchar(ld)) and not(m_add_pointer in aktmodeswitches)) then
                  CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
                if (rd.deftype=pointerdef) and
                   (tpointerdef(rd).pointertype.def.size>1) then
                   begin
                     left:=caddnode.create(muln,left,
                       cordconstnode.create(tpointerdef(rd).pointertype.def.size,sinttype,true));
                   end;
              end
            else
              CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
          end

         else if (ld.deftype=pointerdef) or
                 (is_zero_based_array(ld) and (lt<>stringconstn)) then
           begin
             if is_zero_based_array(ld) then
               begin
                  resulttype.setdef(tpointerdef.create(tarraydef(ld).elementtype));
                  inserttypeconv(left,resulttype);
               end
             else
               resulttype:=left.resulttype;

             inserttypeconv(right,sinttype);
             if nodetype in [addn,subn] then
               begin
                 if not(cs_extsyntax in aktmoduleswitches) or
                    (not(is_pchar(ld)) and not(m_add_pointer in aktmodeswitches)) then
                   CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
                 if (ld.deftype=pointerdef) and
                    (tpointerdef(ld).pointertype.def.size>1) then
                   begin
                     right:=caddnode.create(muln,right,
                       cordconstnode.create(tpointerdef(ld).pointertype.def.size,sinttype,true));
                   end
                 else
                   if is_zero_based_array(ld) and
                      (tarraydef(ld).elementtype.def.size>1) then
                     begin
                       right:=caddnode.create(muln,right,
                         cordconstnode.create(tarraydef(ld).elementtype.def.size,sinttype,true));
                     end;
               end
             else
               CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
           end

         else if (rd.deftype=procvardef) and
                 (ld.deftype=procvardef) and
                 equal_defs(rd,ld) then
          begin
            if (nodetype in [equaln,unequaln]) then
              begin
                if tprocvardef(rd).is_addressonly then
                  begin
                    inserttypeconv_internal(right,voidpointertype);
                    inserttypeconv_internal(left,voidpointertype);
                  end
                else
                  begin
                    { find proc field in methodpointer record }
                    hsym:=tfieldvarsym(trecorddef(methodpointertype.def).symtable.search('proc'));
                    if not assigned(hsym) then
                      internalerror(200412043);
                    { Compare tmehodpointer(left).proc }
                    right:=csubscriptnode.create(
                                 hsym,
                                 ctypeconvnode.create_internal(right,methodpointertype));
                    left:=csubscriptnode.create(
                                 hsym,
                                 ctypeconvnode.create_internal(left,methodpointertype));
                  end;
              end
            else
              CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
          end

         { enums }
         else if (ld.deftype=enumdef) and (rd.deftype=enumdef) then
          begin
            if allowenumop(nodetype) then
              inserttypeconv(right,left.resulttype)
            else
              CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),ld.typename,rd.typename);
          end

         { generic conversion, this is for error recovery }
         else
          begin
            inserttypeconv(left,sinttype);
            inserttypeconv(right,sinttype);
          end;

         { set resulttype if not already done }
         if not assigned(resulttype.def) then
          begin
             case nodetype of
                ltn,lten,gtn,gten,equaln,unequaln :
                  resulttype:=booltype;
                slashn :
                  resulttype:=resultrealtype;
                addn:
                  begin
                    { for strings, return is always a 255 char string }
                    if is_shortstring(left.resulttype.def) then
                     resulttype:=cshortstringtype
                    else
                     resulttype:=left.resulttype;
                  end;
                else
                  resulttype:=left.resulttype;
             end;
          end;

         { when the result is currency we need some extra code for
           multiplication and division. this should not be done when
           the muln or slashn node is created internally }
         if not(nf_is_currency in flags) and
            is_currency(resulttype.def) then
          begin
            case nodetype of
              slashn :
                begin
                  { slashn will only work with floats }
                  hp:=caddnode.create(muln,getcopy,crealconstnode.create(10000.0,s64currencytype));
                  include(hp.flags,nf_is_currency);
                  result:=hp;
                end;
              muln :
                begin
                  if s64currencytype.def.deftype=floatdef then
                    hp:=caddnode.create(slashn,getcopy,crealconstnode.create(10000.0,s64currencytype))
                  else
                    hp:=cmoddivnode.create(divn,getcopy,cordconstnode.create(10000,s64currencytype,false));
                  include(hp.flags,nf_is_currency);
                  result:=hp
                end;
            end;
          end;
      end;


    function taddnode.first_addstring: tnode;
      const
        swap_relation: array [ltn..unequaln] of Tnodetype=(gtn, gten, ltn, lten, equaln, unequaln);
      var
        p: tnode;
      begin
        { when we get here, we are sure that both the left and the right }
        { node are both strings of the same stringtype (JM)              }
        case nodetype of
          addn:
            begin
              if (left.nodetype=stringconstn) and (tstringconstnode(left).len=0) then
                begin
                  result:=right;
                  left:=nil;
                  right:=nil;
                  exit;
                end;
              if (right.nodetype=stringconstn) and (tstringconstnode(right).len=0) then
                begin
                  result:=left;
                  left:=nil;
                  right:=nil;
                  exit;
                end;
              { create the call to the concat routine both strings as arguments }
              result := ccallnode.createintern('fpc_'+
                tstringdef(resulttype.def).stringtypname+'_concat',
                ccallparanode.create(right,ccallparanode.create(left,nil)));
              { we reused the arguments }
              left := nil;
              right := nil;
            end;
          ltn,lten,gtn,gten,equaln,unequaln :
            begin
              { generate better code for comparison with empty string, we
                only need to compare the length with 0 }
              if (nodetype in [equaln,unequaln,gtn,gten,ltn,lten]) and
                 (((left.nodetype=stringconstn) and (tstringconstnode(left).len=0)) or
                  ((right.nodetype=stringconstn) and (tstringconstnode(right).len=0))) then
                begin
                  { switch so that the constant is always on the right }
                  if left.nodetype = stringconstn then
                    begin
                      p := left;
                      left := right;
                      right := p;
                      nodetype:=swap_relation[nodetype];
                    end;
                  if is_shortstring(left.resulttype.def) or
                     (nodetype in [gtn,gten,ltn,lten]) then
                    { compare the length with 0 }
                    result := caddnode.create(nodetype,
                      cinlinenode.create(in_length_x,false,left),
                      cordconstnode.create(0,s32inttype,false))
                  else
                    begin
                      { compare the pointer with nil (for ansistrings etc), }
                      { faster than getting the length (JM)                 }
                      result:= caddnode.create(nodetype,
                        ctypeconvnode.create_internal(left,voidpointertype),
                        cpointerconstnode.create(0,voidpointertype));
                    end;
                  { left is reused }
                  left := nil;
                  { right isn't }
                  right.free;
                  right := nil;
                  exit;
                end;
              { no string constant -> call compare routine }
              result := ccallnode.createintern('fpc_'+
                tstringdef(left.resulttype.def).stringtypname+'_compare',
                ccallparanode.create(right,ccallparanode.create(left,nil)));
              { and compare its result with 0 according to the original operator }
              result := caddnode.create(nodetype,result,
                cordconstnode.create(0,s32inttype,false));
              left := nil;
              right := nil;
            end;
        end;
      end;


    function taddnode.first_addset: tnode;
      var
        procname: string[31];
        tempn: tnode;
        paras: tcallparanode;
        srsym: ttypesym;
      begin
        { get the sym that represents the fpc_normal_set type }
        srsym:=search_system_type('FPC_NORMAL_SET');
        case nodetype of
          equaln,unequaln,lten,gten:
            begin
              case nodetype of
                equaln,unequaln:
                  procname := 'fpc_set_comp_sets';
                lten,gten:
                  begin
                    procname := 'fpc_set_contains_sets';
                    { (left >= right) = (right <= left) }
                    if nodetype = gten then
                      begin
                        tempn := left;
                        left := right;
                        right := tempn;
                      end;
                   end;
               end;
               { convert the arguments (explicitely) to fpc_normal_set's }
               left := ctypeconvnode.create_internal(left,srsym.restype);
               right := ctypeconvnode.create_internal(right,srsym.restype);
               result := ccallnode.createintern(procname,ccallparanode.create(right,
                 ccallparanode.create(left,nil)));
               { left and right are reused as parameters }
               left := nil;
               right := nil;
               { for an unequaln, we have to negate the result of comp_sets }
               if nodetype = unequaln then
                 result := cnotnode.create(result);
            end;
          addn:
            begin
              { optimize first loading of a set }
              if (right.nodetype=setelementn) and
                 not(assigned(tsetelementnode(right).right)) and
                 is_emptyset(left) then
                begin
                  { type cast the value to pass as argument to a byte, }
                  { since that's what the helper expects               }
                  tsetelementnode(right).left :=
                    ctypeconvnode.create_internal(tsetelementnode(right).left,u8inttype);
                  { set the resulttype to the actual one (otherwise it's }
                  { "fpc_normal_set")                                    }
                  result := ccallnode.createinternres('fpc_set_create_element',
                    ccallparanode.create(tsetelementnode(right).left,nil),
                    resulttype);
                  { reused }
                  tsetelementnode(right).left := nil;
                end
              else
                begin
                  if right.nodetype=setelementn then
                   begin
                     { convert the arguments to bytes, since that's what }
                     { the helper expects                               }
                     tsetelementnode(right).left :=
                       ctypeconvnode.create_internal(tsetelementnode(right).left,
                       u8inttype);

                     { convert the original set (explicitely) to an   }
                     { fpc_normal_set so we can pass it to the helper }
                     left := ctypeconvnode.create_internal(left,srsym.restype);

                     { add a range or a single element? }
                     if assigned(tsetelementnode(right).right) then
                       begin
                         tsetelementnode(right).right :=
                           ctypeconvnode.create_internal(tsetelementnode(right).right,
                           u8inttype);

                         { create the call }
                         result := ccallnode.createinternres('fpc_set_set_range',
                           ccallparanode.create(tsetelementnode(right).right,
                           ccallparanode.create(tsetelementnode(right).left,
                           ccallparanode.create(left,nil))),resulttype);
                       end
                     else
                       begin
                         result := ccallnode.createinternres('fpc_set_set_byte',
                           ccallparanode.create(tsetelementnode(right).left,
                           ccallparanode.create(left,nil)),resulttype);
                       end;
                     { remove reused parts from original node }
                     tsetelementnode(right).right := nil;
                     tsetelementnode(right).left := nil;
                     left := nil;
                   end
                  else
                   begin
                     { add two sets }

                     { convert the sets to fpc_normal_set's }
                     result := ccallnode.createinternres('fpc_set_add_sets',
                       ccallparanode.create(
                         ctypeconvnode.create_explicit(right,srsym.restype),
                       ccallparanode.create(
                         ctypeconvnode.create_internal(left,srsym.restype),nil)),resulttype);
                     { remove reused parts from original node }
                     left := nil;
                     right := nil;
                   end;
                end
            end;
          subn,symdifn,muln:
            begin
              { convert the sets to fpc_normal_set's }
              paras := ccallparanode.create(ctypeconvnode.create_internal(right,srsym.restype),
                ccallparanode.create(ctypeconvnode.create_internal(left,srsym.restype),nil));
              case nodetype of
                subn:
                  result := ccallnode.createinternres('fpc_set_sub_sets',
                    paras,resulttype);
                symdifn:
                  result := ccallnode.createinternres('fpc_set_symdif_sets',
                    paras,resulttype);
                muln:
                  result := ccallnode.createinternres('fpc_set_mul_sets',
                    paras,resulttype);
              end;
              { remove reused parts from original node }
              left := nil;
              right := nil;
            end;
          else
            internalerror(200108311);
        end;
      end;


    function taddnode.use_generic_mul32to64: boolean;
      begin
        result := true;
      end;


    function taddnode.try_make_mul32to64: boolean;

      function canbe32bitint(v: tconstexprint; fromdef: torddef; todefsigned: boolean): boolean;
        begin
          if (fromdef.typ <> u64bit) then
            result :=
             ((v >= 0) or
              todefsigned) and
             (v >= low(longint)) and
             (v <= high(longint))
          else
            result :=
             (qword(v) >= low(cardinal)) and
             (qword(v) <= high(cardinal))
        end;

      var
        temp: tnode;
      begin
        result := false;
        if ((left.nodetype = typeconvn) and
            is_integer(ttypeconvnode(left).left.resulttype.def) and
            (not(torddef(ttypeconvnode(left).left.resulttype.def).typ in [u64bit,s64bit]))  and
           (((right.nodetype = ordconstn) and
             canbe32bitint(tordconstnode(right).value,torddef(right.resulttype.def),is_signed(left.resulttype.def))) or
            ((right.nodetype = typeconvn) and
             is_integer(ttypeconvnode(right).left.resulttype.def) and
             not(torddef(ttypeconvnode(right).left.resulttype.def).typ in [u64bit,s64bit])) and
             (is_signed(ttypeconvnode(left).left.resulttype.def) =
              is_signed(ttypeconvnode(right).left.resulttype.def)))) then
          begin
            temp := ttypeconvnode(left).left;
            ttypeconvnode(left).left := nil;
            left.free;
            left := temp;
            if (right.nodetype = typeconvn) then
              begin
                temp := ttypeconvnode(right).left;
                ttypeconvnode(right).left := nil;
                right.free;
                right := temp;
              end;
            if (is_signed(left.resulttype.def)) then
              begin
                inserttypeconv(left,s32inttype);
                inserttypeconv(right,s32inttype);
              end
            else
              begin
                inserttypeconv(left,u32inttype);
                inserttypeconv(right,u32inttype);
              end;
            firstpass(left);
            firstpass(right);
            result := true;
          end;
      end;


    function taddnode.first_add64bitint: tnode;
      var
        procname: string[31];
        temp: tnode;
        power: longint;
      begin
        result := nil;
        { create helper calls mul }
        if nodetype <> muln then
          exit;

        { make sure that if there is a constant, that it's on the right }
        if left.nodetype = ordconstn then
          begin
            temp := right;
            right := left;
            left := temp;
          end;

        { can we use a shift instead of a mul? }
        if not (cs_check_overflow in aktlocalswitches) and
           (right.nodetype = ordconstn) and
           ispowerof2(tordconstnode(right).value,power) then
          begin
            tordconstnode(right).value := power;
            result := cshlshrnode.create(shln,left,right);
            { left and right are reused }
            left := nil;
            right := nil;
            { return firstpassed new node }
            exit;
          end;

        if not(use_generic_mul32to64) and
           try_make_mul32to64 then
          exit;

        { when currency is used set the result of the
          parameters to s64bit, so they are not converted }
        if is_currency(resulttype.def) then
          begin
            left.resulttype:=s64inttype;
            right.resulttype:=s64inttype;
          end;

        { otherwise, create the parameters for the helper }
        right := ccallparanode.create(
          cordconstnode.create(ord(cs_check_overflow in aktlocalswitches),booltype,true),
          ccallparanode.create(right,ccallparanode.create(left,nil)));
        left := nil;
        { only qword needs the unsigned code, the
          signed code is also used for currency }
        if is_signed(resulttype.def) then
          procname := 'fpc_mul_int64'
        else
          procname := 'fpc_mul_qword';
        result := ccallnode.createintern(procname,right);
        right := nil;
      end;


    function taddnode.first_addfloat : tnode;
      var
        procname: string[31];
        { do we need to reverse the result ? }
        notnode : boolean;
      begin
        result := nil;
        notnode := false;
        { In non-emulation mode, real opcodes are
          emitted for floating point values.
        }
        if not (cs_fp_emulation in aktmoduleswitches) then
          exit;

        if not(target_info.system in system_wince) then
          begin
            case tfloatdef(left.resulttype.def).typ of
              s32real:
                procname:='float32';
              s64real:
                procname:='float64';
              {!!! not yet implemented
              s128real:
              }
              else
                internalerror(2005082601);
            end;

            case nodetype of
              addn:
                procname:=procname+'_add';
              muln:
                procname:=procname+'_mul';
              subn:
                procname:=procname+'_sub';
              slashn:
                procname:=procname+'_div';
              ltn:
                procname:=procname+'_lt';
              lten:
                procname:=procname+'_le';
              gtn:
                begin
                  procname:=procname+'_le';
                  notnode:=true;
                end;
              gten:
                begin
                  procname:=procname+'_lt';
                  notnode:=true;
                end;
              equaln:
                procname:=procname+'_eq';
              unequaln:
                begin
                  procname:=procname+'_eq';
                  notnode:=true;
                end;
              else
                CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),left.resulttype.def.typename,right.resulttype.def.typename);
            end;
          end
        else
          begin
            case nodetype of
              addn:
                procname:='ADD';
              muln:
                procname:='MUL';
              subn:
                procname:='SUB';
              slashn:
                procname:='DIV';
              ltn:
                procname:='LT';
              lten:
                procname:='LE';
              gtn:
                procname:='GT';
              gten:
                procname:='GE';
              equaln:
                procname:='EQ';
              unequaln:
                procname:='NE';
              else
                CGMessage3(type_e_operator_not_supported_for_types,node2opstr(nodetype),left.resulttype.def.typename,right.resulttype.def.typename);
            end;
            case tfloatdef(left.resulttype.def).typ of
              s32real:
                procname:=procname+'S';
              s64real:
                procname:=procname+'D';
              {!!! not yet implemented
              s128real:
              }
              else
                internalerror(2005082602);
            end;

          end;
        result:=ccallnode.createintern(procname,ccallparanode.create(right,
           ccallparanode.create(left,nil)));
        left:=nil;
        right:=nil;

        { do we need to reverse the result }
        if notnode then
          result:=cnotnode.create(result);
      end;


    function taddnode.pass_1 : tnode;
      var
{$ifdef addstringopt}
         hp      : tnode;
{$endif addstringopt}
         lt,rt   : tnodetype;
         rd,ld   : tdef;
      begin
         result:=nil;

         { Can we optimize multiple string additions into a single call?
           This need to be done on a complete tree to detect the multiple
           add nodes and is therefor done before the subtrees are processed }
         if canbemultistringadd(self) then
           begin
             result := genmultistringadd(self);
             exit;
           end;

         { first do the two subtrees }
         firstpass(left);
         firstpass(right);

         if codegenerror then
           exit;

         { load easier access variables }
         rd:=right.resulttype.def;
         ld:=left.resulttype.def;
         rt:=right.nodetype;
         lt:=left.nodetype;

         { int/int gives real/real! }
         if nodetype=slashn then
           begin
{$ifdef cpufpemu}
             if (aktfputype=fpu_soft) or (cs_fp_emulation in aktmoduleswitches) then
               begin
                 result:=first_addfloat;
                 if assigned(result) then
                   exit;
               end;
{$endif cpufpemu}
             expectloc:=LOC_FPUREGISTER;
             { maybe we need an integer register to save }
             { a reference                               }
             if ((left.expectloc<>LOC_FPUREGISTER) or
                 (right.expectloc<>LOC_FPUREGISTER)) and
                (left.registersint=right.registersint) then
               calcregisters(self,1,1,0)
             else
               calcregisters(self,0,1,0);
              { an add node always first loads both the left and the    }
              { right in the fpu before doing the calculation. However, }
              { calcregisters(0,2,0) will overestimate the number of    }
              { necessary registers (it will make it 3 in case one of   }
              { the operands is already in the fpu) (JM)                }
              if ((left.expectloc<>LOC_FPUREGISTER) or
                  (right.expectloc<>LOC_FPUREGISTER)) and
                 (registersfpu < 2) then
                inc(registersfpu);
           end

         { if both are orddefs then check sub types }
         else if (ld.deftype=orddef) and (rd.deftype=orddef) then
           begin
           { 2 booleans ? }
             if is_boolean(ld) and is_boolean(rd) then
              begin
                if (not(cs_full_boolean_eval in aktlocalswitches) or
                    (nf_short_bool in flags)) and
                   (nodetype in [andn,orn]) then
                 begin
                   expectloc:=LOC_JUMP;
                   calcregisters(self,0,0,0);
                 end
                else
                 begin
                   if nodetype in [ltn,lten,gtn,gten,equaln,unequaln] then
                     begin
                       expectloc:=LOC_FLAGS;
                       if (left.expectloc in [LOC_JUMP,LOC_FLAGS]) and
                          (left.expectloc in [LOC_JUMP,LOC_FLAGS]) then
                         calcregisters(self,2,0,0)
                       else
                         calcregisters(self,1,0,0);
                     end
                   else
                     begin
                       expectloc:=LOC_REGISTER;
                       calcregisters(self,0,0,0);
                     end;
                 end;
              end
             else
             { Both are chars? only convert to shortstrings for addn }
              if is_char(ld) then
               begin
                 if nodetype=addn then
                  internalerror(200103291);
                 expectloc:=LOC_FLAGS;
                 calcregisters(self,1,0,0);
               end
{$ifndef cpu64bit}
              { is there a 64 bit type ? }
             else if (torddef(ld).typ in [s64bit,u64bit,scurrency]) then
               begin
                 result := first_add64bitint;
                 if assigned(result) then
                   exit;
                  if nodetype in [addn,subn,muln,andn,orn,xorn] then
                    expectloc:=LOC_REGISTER
                  else
                    expectloc:=LOC_JUMP;
                  calcregisters(self,2,0,0)
               end
{$endif cpu64bit}
             { is there a cardinal? }
             else if (torddef(ld).typ=u32bit) then
               begin
                  if nodetype in [addn,subn,muln,andn,orn,xorn] then
                    expectloc:=LOC_REGISTER
                  else
                    expectloc:=LOC_FLAGS;
                 calcregisters(self,1,0,0);
                 { for unsigned mul we need an extra register }
                 if nodetype=muln then
                  inc(registersint);
               end
             { generic s32bit conversion }
             else
               begin
                  if nodetype in [addn,subn,muln,andn,orn,xorn] then
                    expectloc:=LOC_REGISTER
                  else
                    expectloc:=LOC_FLAGS;
                 calcregisters(self,1,0,0);
               end;
           end

         { left side a setdef, must be before string processing,
           else array constructor can be seen as array of char (PFV) }
         else if (ld.deftype=setdef) then
           begin
             if tsetdef(ld).settype=smallset then
               begin
                 if nodetype in [ltn,lten,gtn,gten,equaln,unequaln] then
                   expectloc:=LOC_FLAGS
                 else
                   expectloc:=LOC_REGISTER;
                 { are we adding set elements ? }
                 if right.nodetype=setelementn then
                   calcregisters(self,2,0,0)
                 else
                   calcregisters(self,1,0,0);
               end
             else
{$ifdef MMXSET}
{$ifdef i386}
               if cs_mmx in aktlocalswitches then
                 begin
                   expectloc:=LOC_MMXREGISTER;
                   calcregisters(self,0,0,4);
                 end
               else
{$endif}
{$endif MMXSET}
                 begin
                   result := first_addset;
                   if assigned(result) then
                     exit;
                   expectloc:=LOC_CREFERENCE;
                   calcregisters(self,0,0,0);
                   { here we call SET... }
                   include(current_procinfo.flags,pi_do_call);
                 end;
           end

         { compare pchar by addresses like BP/Delphi }
         else if is_pchar(ld) then
           begin
             if nodetype in [addn,subn,muln,andn,orn,xorn] then
               expectloc:=LOC_REGISTER
             else
               expectloc:=LOC_FLAGS;
             calcregisters(self,1,0,0);
           end

         { is one of the operands a string }
         else if (ld.deftype=stringdef) then
            begin
              if is_widestring(ld) then
                begin
                   { this is only for add, the comparisaion is handled later }
                   expectloc:=LOC_REGISTER;
                end
              else if is_ansistring(ld) then
                begin
                   { this is only for add, the comparisaion is handled later }
                   expectloc:=LOC_REGISTER;
                end
              else if is_longstring(ld) then
                begin
                   { this is only for add, the comparisaion is handled later }
                   expectloc:=LOC_REFERENCE;
                end
              else
                begin
{$ifdef addstringopt}
                   { can create a call which isn't handled by callparatemp }
                   if canbeaddsstringcharoptnode(self) then
                     begin
                       hp := genaddsstringcharoptnode(self);
                       pass_1 := hp;
                       exit;
                     end
                   else
{$endif addstringopt}
                     begin
                       { Fix right to be shortstring }
                       if is_char(right.resulttype.def) then
                        begin
                          inserttypeconv(right,cshortstringtype);
                          firstpass(right);
                        end;
                     end;
{$ifdef addstringopt}
                   { can create a call which isn't handled by callparatemp }
                   if canbeaddsstringcsstringoptnode(self) then
                     begin
                       hp := genaddsstringcsstringoptnode(self);
                       pass_1 := hp;
                       exit;
                     end;
{$endif addstringopt}
                end;
             { otherwise, let addstring convert everything }
              result := first_addstring;
              exit;
           end

         { is one a real float ? }
         else if (rd.deftype=floatdef) or (ld.deftype=floatdef) then
            begin
{$ifdef cpufpemu}
             if (aktfputype=fpu_soft) or (cs_fp_emulation in aktmoduleswitches) then
               begin
                 result:=first_addfloat;
                 if assigned(result) then
                   exit;
               end;
{$endif cpufpemu}
              if nodetype in [addn,subn,muln,andn,orn,xorn] then
                expectloc:=LOC_FPUREGISTER
              else
                expectloc:=LOC_FLAGS;
              calcregisters(self,0,1,0);
              { an add node always first loads both the left and the    }
              { right in the fpu before doing the calculation. However, }
              { calcregisters(0,2,0) will overestimate the number of    }
              { necessary registers (it will make it 3 in case one of   }
              { the operands is already in the fpu) (JM)                }
              if ((left.expectloc<>LOC_FPUREGISTER) or
                  (right.expectloc<>LOC_FPUREGISTER)) and
                 (registersfpu < 2) then
                inc(registersfpu);
            end

         { pointer comperation and subtraction }
         else if (ld.deftype=pointerdef) then
            begin
              if nodetype in [addn,subn,muln,andn,orn,xorn] then
                expectloc:=LOC_REGISTER
              else
                expectloc:=LOC_FLAGS;
              calcregisters(self,1,0,0);
           end

         else if is_class_or_interface(ld) then
            begin
              expectloc:=LOC_FLAGS;
              calcregisters(self,1,0,0);
            end

         else if (ld.deftype=classrefdef) then
            begin
              expectloc:=LOC_FLAGS;
              calcregisters(self,1,0,0);
            end

         { support procvar=nil,procvar<>nil }
         else if ((ld.deftype=procvardef) and (rt=niln)) or
                 ((rd.deftype=procvardef) and (lt=niln)) then
            begin
              expectloc:=LOC_FLAGS;
              calcregisters(self,1,0,0);
            end

{$ifdef SUPPORT_MMX}
       { mmx support, this must be before the zero based array
         check }
         else if (cs_mmx in aktlocalswitches) and is_mmx_able_array(ld) and
                 is_mmx_able_array(rd) then
            begin
              expectloc:=LOC_MMXREGISTER;
              calcregisters(self,0,0,1);
            end
{$endif SUPPORT_MMX}

         else if (rd.deftype=pointerdef) or (ld.deftype=pointerdef) then
            begin
              expectloc:=LOC_REGISTER;
              calcregisters(self,1,0,0);
            end

         else  if (rd.deftype=procvardef) and
                  (ld.deftype=procvardef) and
                  equal_defs(rd,ld) then
           begin
             expectloc:=LOC_FLAGS;
             calcregisters(self,1,0,0);
           end

         else if (ld.deftype=enumdef) then
           begin
              expectloc:=LOC_FLAGS;
              calcregisters(self,1,0,0);
           end

{$ifdef SUPPORT_MMX}
         else if (cs_mmx in aktlocalswitches) and
                 is_mmx_able_array(ld) and
                 is_mmx_able_array(rd) then
            begin
              expectloc:=LOC_MMXREGISTER;
              calcregisters(self,0,0,1);
            end
{$endif SUPPORT_MMX}

         { the general solution is to convert to 32 bit int }
         else
           begin
             expectloc:=LOC_REGISTER;
             calcregisters(self,1,0,0);
           end;
      end;

{$ifdef state_tracking}
    function Taddnode.track_state_pass(exec_known:boolean):boolean;

    var factval:Tnode;

    begin
    track_state_pass:=false;
    if left.track_state_pass(exec_known) then
      begin
        track_state_pass:=true;
        left.resulttype.def:=nil;
        do_resulttypepass(left);
      end;
    factval:=aktstate.find_fact(left);
    if factval<>nil then
        begin
        track_state_pass:=true;
            left.destroy;
            left:=factval.getcopy;
        end;
    if right.track_state_pass(exec_known) then
        begin
        track_state_pass:=true;
        right.resulttype.def:=nil;
        do_resulttypepass(right);
        end;
    factval:=aktstate.find_fact(right);
    if factval<>nil then
        begin
        track_state_pass:=true;
            right.destroy;
            right:=factval.getcopy;
        end;
    end;
{$endif}

begin
   caddnode:=taddnode;
end.