freepascal.compiler/compiler/i386/n386add.pas

{
    $Id$
    Copyright (c) 2000 by Florian Klaempfl

    Code generation for add nodes on the i386

    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 n386add;

{$i defines.inc}

interface

    uses
       node,nadd,cpubase;

    type
       ti386addnode = class(taddnode)
          procedure pass_2;override;
          function getresflags(unsigned : boolean) : tresflags;
          procedure SetResultLocation(cmpop,unsigned : boolean);
         protected
          function first_addstring : tnode; override;
         private
          procedure second_addstring;
       end;

  implementation

    uses
      globtype,systems,
      cutils,verbose,globals,widestr,
      symconst,symdef,aasm,types,htypechk,
      cgbase,temp_gen,pass_2,regvars,
      cpuasm,
      ncon,nset,
      tainst,cga,ncgutil,n386util,tgcpu;

    function ti386addnode.getresflags(unsigned : boolean) : tresflags;

      begin
         case nodetype of
           equaln : getresflags:=F_E;
           unequaln : getresflags:=F_NE;
          else
           if not(unsigned) then
             begin
                if nf_swaped in flags then
                  case nodetype of
                     ltn : getresflags:=F_G;
                     lten : getresflags:=F_GE;
                     gtn : getresflags:=F_L;
                     gten : getresflags:=F_LE;
                  end
                else
                  case nodetype of
                     ltn : getresflags:=F_L;
                     lten : getresflags:=F_LE;
                     gtn : getresflags:=F_G;
                     gten : getresflags:=F_GE;
                  end;
             end
           else
             begin
                if nf_swaped in flags then
                  case nodetype of
                     ltn : getresflags:=F_A;
                     lten : getresflags:=F_AE;
                     gtn : getresflags:=F_B;
                     gten : getresflags:=F_BE;
                  end
                else
                  case nodetype of
                     ltn : getresflags:=F_B;
                     lten : getresflags:=F_BE;
                     gtn : getresflags:=F_A;
                     gten : getresflags:=F_AE;
                  end;
             end;
         end;
      end;


    procedure ti386addnode.SetResultLocation(cmpop,unsigned : boolean);

      begin
         { remove temporary location if not a set or string }
         { that's a bad hack (FK) who did this ?            }
         if (left.resulttype.def.deftype<>stringdef) and
            ((left.resulttype.def.deftype<>setdef) or (tsetdef(left.resulttype.def).settype=smallset)) and
            (left.location.loc in [LOC_MEM,LOC_REFERENCE]) then
           ungetiftemp(left.location.reference);
         if (right.resulttype.def.deftype<>stringdef) and
            ((right.resulttype.def.deftype<>setdef) or (tsetdef(right.resulttype.def).settype=smallset)) and
            (right.location.loc in [LOC_MEM,LOC_REFERENCE]) then
           ungetiftemp(right.location.reference);
         { in case of comparison operation the put result in the flags }
         if cmpop then
           begin
              clear_location(location);
              location.loc:=LOC_FLAGS;
              location.resflags:=getresflags(unsigned);
           end;
      end;


{*****************************************************************************
                                Addstring
*****************************************************************************}

    { note: if you implemented an fpc_shortstr_concat similar to the    }
    { one in i386.inc, you have to override first_addstring like in     }
    { ti386addnode.first_string and implement the shortstring concat    }
    { manually! The generic routine is different from the i386 one (JM) }
    function ti386addnode.first_addstring : tnode;

      begin
        { special cases for shortstrings, handled in pass_2 (JM) }
        { can't handle fpc_shortstr_compare with compilerproc either because it }
        { returns its results in the flags instead of in eax                    }
        if (((nodetype = addn) and
             is_shortstring(resulttype.def)) or
            ((nodetype in [ltn,lten,gtn,gten,equaln,unequaln]) and
             is_shortstring(left.resulttype.def))) then
          begin
            if nodetype = addn then
              location.loc := LOC_MEM
            else
              location.loc := LOC_FLAGS;
            calcregisters(self,0,0,0);
            result := nil;
            exit;
          end;
        { otherwise, use the generic code }
        result := inherited first_addstring;
      end;


    procedure ti386addnode.second_addstring;

      var
        pushedregs : tpushed;
        href       : treference;
        pushed,
        cmpop      : boolean;
        regstopush : byte;
      begin
        { string operations are not commutative }
        if nf_swaped in flags then
          swapleftright;
        case tstringdef(left.resulttype.def).string_typ of
           st_shortstring:
             begin
                case nodetype of
                   addn:
                     begin
                        cmpop:=false;
                        secondpass(left);
                        { if str_concat is set in expr
                          s:=s+ ... no need to create a temp string (PM) }
                        { the tempstring can also come from a typeconversion }
                        { or a function result, so simply check for a        }
                        { temp of 256 bytes(JM)                                          }

                        if not(istemp(left.location.reference) and
                               (getsizeoftemp(left.location.reference) = 256)) and
                           not(nf_use_strconcat in flags) then
                          begin

                             { can only reference be }
                             { string in register would be funny    }
                             { therefore produce a temporary string }

                             gettempofsizereference(256,href);
                             copyshortstring(href,left.location.reference,255,false,true);
                             { release the registers }
{                             done by copyshortstring now (JM)           }
{                             del_reference(left.location.reference); }
                             ungetiftemp(left.location.reference);

                             { does not hurt: }
                             clear_location(left.location);
                             left.location.loc:=LOC_MEM;
                             left.location.reference:=href;

                          end;

                        secondpass(right);

                        { on the right we do not need the register anymore too }
                        { Instead of releasing them already, simply do not }
                        { push them (so the release is in the right place, }
                        { because emitpushreferenceaddr doesn't need extra }
                        { registers) (JM)                                  }
                        regstopush := $ff;
                        remove_non_regvars_from_loc(right.location,
                          regstopush);
                        pushusedregisters(pushedregs,regstopush);
                       { push the maximum possible length of the result }
                        emitpushreferenceaddr(left.location.reference);
                       { the optimizer can more easily put the          }
                       { deallocations in the right place if it happens }
                       { too early than when it happens too late (if    }
                       { the pushref needs a "lea (..),edi; push edi")  }
                        del_reference(right.location.reference);
                        emitpushreferenceaddr(right.location.reference);
                        saveregvars(regstopush);
                        emitcall('FPC_SHORTSTR_CONCAT');
                        ungetiftemp(right.location.reference);
                        maybe_loadself;
                        popusedregisters(pushedregs);
                        set_location(location,left.location);
                     end;
                   ltn,lten,gtn,gten,equaln,unequaln :
                     begin
                       cmpop := true;
                       pushusedregisters(pushedregs,$ff);
                       secondpass(left);
                       emitpushreferenceaddr(left.location.reference);
                       del_reference(left.location.reference);
                       secondpass(right);
                       emitpushreferenceaddr(right.location.reference);
                       del_reference(right.location.reference);
                       saveregvars($ff);
                       emitcall('FPC_SHORTSTR_COMPARE');
                       maybe_loadself;
                       popusedregisters(pushedregs);
                       ungetiftemp(left.location.reference);
                       ungetiftemp(right.location.reference);
                     end;
                end;
                SetResultLocation(cmpop,true);
             end;
           else
             { rest should be handled in first pass (JM) }
             internalerror(200108303);
       end;
     end;


{*****************************************************************************
                                pass_2
*****************************************************************************}

    procedure ti386addnode.pass_2;
    { is also being used for xor, and "mul", "sub, or and comparative }
    { operators                                                }

      label do_normal;

      var
         unusedregisters : tregisterset;
         usablecount : byte;
         hregister,hregister2 : tregister;
         noswap,popeax,popedx,
         pushed,pushedfpu,
         mboverflow,cmpop : boolean;
         op,op2 : tasmop;
         resflags : tresflags;
         otl,ofl : tasmlabel;
         power : longint;
         opsize : topsize;
         hl4: tasmlabel;
         hr : preference;

         { true, if unsigned types are compared }
         unsigned : boolean;
         { true, if a small set is handled with the longint code }
         is_set : boolean;
         { is_in_dest if the result is put directly into }
         { the resulting refernce or varregister }
         is_in_dest : boolean;
         { true, if for sets subtractions the extra not should generated }
         extra_not : boolean;

{$ifdef SUPPORT_MMX}
         mmxbase : tmmxtype;
{$endif SUPPORT_MMX}
         pushedreg : tpushed;
         regstopush: byte;

      procedure firstjmp64bitcmp;

        var
           oldnodetype : tnodetype;

        begin
           load_all_regvars(exprasmlist);
           { the jump the sequence is a little bit hairy }
           case nodetype of
              ltn,gtn:
                begin
                   emitjmp(flags_to_cond(getresflags(unsigned)),truelabel);
                   { cheat a little bit for the negative test }
                   toggleflag(nf_swaped);
                   emitjmp(flags_to_cond(getresflags(unsigned)),falselabel);
                   toggleflag(nf_swaped);
                end;
              lten,gten:
                begin
                   oldnodetype:=nodetype;
                   if nodetype=lten then
                     nodetype:=ltn
                   else
                     nodetype:=gtn;
                   emitjmp(flags_to_cond(getresflags(unsigned)),truelabel);
                   { cheat for the negative test }
                   if nodetype=ltn then
                     nodetype:=gtn
                   else
                     nodetype:=ltn;
                   emitjmp(flags_to_cond(getresflags(unsigned)),falselabel);
                   nodetype:=oldnodetype;
                end;
              equaln:
                emitjmp(C_NE,falselabel);
              unequaln:
                emitjmp(C_NE,truelabel);
           end;
        end;

      procedure secondjmp64bitcmp;

        begin
           { the jump the sequence is a little bit hairy }
           case nodetype of
              ltn,gtn,lten,gten:
                begin
                   { the comparisaion of the low dword have to be }
                   {  always unsigned!                            }
                   emitjmp(flags_to_cond(getresflags(true)),truelabel);
                   emitjmp(C_None,falselabel);
                end;
              equaln:
                begin
                   emitjmp(C_NE,falselabel);
                   emitjmp(C_None,truelabel);
                end;
              unequaln:
                begin
                   emitjmp(C_NE,truelabel);
                   emitjmp(C_None,falselabel);
                end;
           end;
        end;

      begin
      { to make it more readable, string and set (not smallset!) have their
        own procedures }
         case left.resulttype.def.deftype of
         stringdef : begin
                       second_addstring;
                       exit;
                     end;
            setdef : begin
                     { normalsets are handled separate }
                       if not(tsetdef(left.resulttype.def).settype=smallset) then
                        begin
                          { should be handled in pass 1 (JM) }
                          internalerror(200109041);
                        end;
                     end;
         end;

         { defaults }
         unsigned:=false;
         is_in_dest:=false;
         extra_not:=false;
         noswap:=false;
         opsize:=S_L;

         { are we a (small)set, must be set here because the side can be
           swapped ! (PFV) }
         is_set:=(left.resulttype.def.deftype=setdef);

         { calculate the operator which is more difficult }
         firstcomplex(self);

         { handling boolean expressions extra: }
         if is_boolean(left.resulttype.def) and
            is_boolean(right.resulttype.def) then
           begin
             if (torddef(left.resulttype.def).typ=bool8bit) or
                (torddef(right.resulttype.def).typ=bool8bit) then
               opsize:=S_B
             else
               if (torddef(left.resulttype.def).typ=bool16bit) or
                  (torddef(right.resulttype.def).typ=bool16bit) then
                 opsize:=S_W
             else
               opsize:=S_L;
             if (cs_full_boolean_eval in aktlocalswitches) or
                (nodetype in
                  [unequaln,ltn,lten,gtn,gten,equaln,xorn]) then
               begin
                 if left.nodetype in [ordconstn,realconstn] then
                  swapleftright;
                 if left.location.loc=LOC_JUMP then
                   begin
                      otl:=truelabel;
                      getlabel(truelabel);
                      ofl:=falselabel;
                      getlabel(falselabel);
                   end;

                 secondpass(left);
                 { if in flags then copy first to register, because the
                   flags can be destroyed }
                 case left.location.loc of
                    LOC_FLAGS:
                      locflags2reg(left.location,opsize);
                    LOC_JUMP:
                      locjump2reg(left.location,opsize, otl, ofl);
                 end;
                 set_location(location,left.location);
                 pushed:=maybe_push(right.registers32,self,false);
                 if right.location.loc=LOC_JUMP then
                   begin
                      otl:=truelabel;
                      getlabel(truelabel);
                      ofl:=falselabel;
                      getlabel(falselabel);
                   end;
                 secondpass(right);
                 if pushed then
                   begin
                      restore(self,false);
                      set_location(left.location,location);
                   end;
                 case right.location.loc of
                    LOC_FLAGS:
                      locflags2reg(right.location,opsize);
                    LOC_JUMP:
                      locjump2reg(right.location,opsize,otl,ofl);
                 end;
                 goto do_normal;
              end;

             case nodetype of
              andn,
               orn : begin
                       clear_location(location);
                       location.loc:=LOC_JUMP;
                       cmpop:=false;
                       case nodetype of
                        andn : begin
                                  otl:=truelabel;
                                  getlabel(truelabel);
                                  secondpass(left);
                                  maketojumpbool(left,lr_load_regvars);
                                  emitlab(truelabel);
                                  truelabel:=otl;
                               end;
                        orn : begin
                                 ofl:=falselabel;
                                 getlabel(falselabel);
                                 secondpass(left);
                                 maketojumpbool(left,lr_load_regvars);
                                 emitlab(falselabel);
                                 falselabel:=ofl;
                              end;
                       else
                         CGMessage(type_e_mismatch);
                       end;
                       secondpass(right);
                       maketojumpbool(right,lr_load_regvars);
                     end;
             else
               CGMessage(type_e_mismatch);
             end
           end
         else
           begin
              { in case of constant put it to the left }
              if (left.nodetype=ordconstn) then
               swapleftright;
              secondpass(left);
              { this will be complicated as
               a lot of code below assumes that
               location and left.location are the same }

{$ifdef test_dest_loc}
              if dest_loc_known and (dest_loc_tree=p) and
                 ((dest_loc.loc=LOC_REGISTER) or (dest_loc.loc=LOC_CREGISTER)) then
                begin
                   set_location(location,dest_loc);
                   in_dest_loc:=true;
                   is_in_dest:=true;
                end
              else
{$endif test_dest_loc}
                set_location(location,left.location);

              { are too few registers free? }
              pushed:=maybe_push(right.registers32,self,is_64bitint(left.resulttype.def));
              if location.loc=LOC_FPU then
                pushedfpu:=maybe_pushfpu(right.registersfpu,self)
              else
                pushedfpu:=false;
              secondpass(right);
              if pushed then
                begin
                  restore(self,is_64bitint(left.resulttype.def));
                  set_location(left.location,location);
                end;

              if (left.resulttype.def.deftype=pointerdef) or

                 (right.resulttype.def.deftype=pointerdef) or

                 (is_class_or_interface(right.resulttype.def) and is_class_or_interface(left.resulttype.def)) or

                 (left.resulttype.def.deftype=classrefdef) or

                 (left.resulttype.def.deftype=procvardef) or

                 ((left.resulttype.def.deftype=enumdef) and
                  (left.resulttype.def.size=4)) or

                 ((left.resulttype.def.deftype=orddef) and
                 (torddef(left.resulttype.def).typ=s32bit)) or
                 ((right.resulttype.def.deftype=orddef) and
                 (torddef(right.resulttype.def).typ=s32bit)) or

                ((left.resulttype.def.deftype=orddef) and
                 (torddef(left.resulttype.def).typ=u32bit)) or
                 ((right.resulttype.def.deftype=orddef) and
                 (torddef(right.resulttype.def).typ=u32bit)) or

                { as well as small sets }
                 is_set then
                begin
          do_normal:
                   mboverflow:=false;
                   cmpop:=false;
                   unsigned := not(is_signed(left.resulttype.def)) or
                               not(is_signed(right.resulttype.def));
                   case nodetype of
                      addn : begin
                               { this is a really ugly hack!!!!!!!!!! }
                               { this could be done later using EDI   }
                               { as it is done for subn               }
                               { instead of two registers!!!!         }
                               if is_set then
                                begin
                                { adding elements is not commutative }
                                  if (nf_swaped in flags) and (left.nodetype=setelementn) then
                                   swapleftright;
                                { are we adding set elements ? }
                                  if right.nodetype=setelementn then
                                   begin
                                   { no range support for smallsets! }
                                     if assigned(tsetelementnode(right).right) then
                                      internalerror(43244);
                                   { bts requires both elements to be registers }
                                     if left.location.loc in [LOC_MEM,LOC_REFERENCE] then
                                      begin
                                        ungetiftemp(left.location.reference);
                                        del_location(left.location);
{!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!}
                                        hregister:=getregisterint;
                                        emit_ref_reg(A_MOV,opsize,
                                          newreference(left.location.reference),hregister);
                                        clear_location(left.location);
                                        left.location.loc:=LOC_REGISTER;
                                        left.location.register:=hregister;
                                        set_location(location,left.location);
                                      end;
                                     if right.location.loc in [LOC_MEM,LOC_REFERENCE] then
                                      begin
                                        ungetiftemp(right.location.reference);
                                        del_location(right.location);
                                        hregister:=getregisterint;
                                        emit_ref_reg(A_MOV,opsize,
                                          newreference(right.location.reference),hregister);
                                        clear_location(right.location);
                                        right.location.loc:=LOC_REGISTER;
                                        right.location.register:=hregister;
                                      end;
                                     op:=A_BTS;
                                     noswap:=true;
                                   end
                                  else
                                   op:=A_OR;
                                  mboverflow:=false;
                                  unsigned:=false;
                                end
                               else
                                begin
                                  op:=A_ADD;
                                  mboverflow:=true;
                                end;
                             end;
                   symdifn : begin
                               { the symetric diff is only for sets }
                               if is_set then
                                begin
                                  op:=A_XOR;
                                  mboverflow:=false;
                                  unsigned:=false;
                                end
                               else
                                CGMessage(type_e_mismatch);
                             end;
                      muln : begin
                               if is_set then
                                begin
                                  op:=A_AND;
                                  mboverflow:=false;
                                  unsigned:=false;
                                end
                               else
                                begin
                                  if unsigned then
                                   op:=A_MUL
                                  else
                                   op:=A_IMUL;
                                  mboverflow:=true;
                                end;
                             end;
                      subn : begin
                               if is_set then
                                begin
                                  op:=A_AND;
                                  mboverflow:=false;
                                  unsigned:=false;
                                  If (not (nf_swaped in flags)) and
                                     (right.nodetype = setconstn) then
                                    right.location.reference.offset := not(right.location.reference.offset)
                                  Else If (nf_swaped in flags) and
                                     (left.nodetype = setconstn) then
                                    left.location.reference.offset := not(left.location.reference.offset)
                                  Else
                                    extra_not:=true;
                                end
                               else
                                begin
                                  op:=A_SUB;
                                  mboverflow:=true;
                                end;
                             end;
                  ltn,lten,
                  gtn,gten,
           equaln,unequaln : begin
                               If is_set Then
                                 Case nodetype of
                                   lten,gten:
                                     Begin
                                      If nodetype = lten then
                                        swapleftright;
                                      if left.location.loc in [LOC_MEM,LOC_REFERENCE] then
                                        begin
                                         ungetiftemp(left.location.reference);
                                         del_reference(left.location.reference);
                                         hregister:=getregisterint;
                                         emit_ref_reg(A_MOV,opsize,
                                           newreference(left.location.reference),hregister);
                                         clear_location(left.location);
                                         left.location.loc:=LOC_REGISTER;
                                         left.location.register:=hregister;
                                         set_location(location,left.location);
                                       end
                                      else
                                       if left.location.loc = LOC_CREGISTER Then
                                        {save the register var in a temp register, because
                                          its value is going to be modified}
                                          begin
                                            hregister := getregisterint;
                                            emit_reg_reg(A_MOV,opsize,
                                              left.location.register,hregister);
                                             clear_location(left.location);
                                             left.location.loc:=LOC_REGISTER;
                                             left.location.register:=hregister;
                                             set_location(location,left.location);
                                           end;
                                     {here, left.location should be LOC_REGISTER}
                                      If right.location.loc in [LOC_MEM,LOC_REFERENCE] Then
                                         emit_ref_reg(A_AND,opsize,
                                           newreference(right.location.reference),left.location.register)
                                      Else
                                        emit_reg_reg(A_AND,opsize,
                                          right.location.register,left.location.register);
                {warning: ugly hack ahead: we need a "jne" after the cmp, so
                 change the nodetype from lten/gten to equaln}
                                      nodetype := equaln
                                     End;
                           {no < or > support for sets}
                                   ltn,gtn: CGMessage(type_e_mismatch);
                                 End;
                               op:=A_CMP;
                               cmpop:=true;
                             end;
                      xorn : op:=A_XOR;
                       orn : op:=A_OR;
                      andn : op:=A_AND;
                   else
                     CGMessage(type_e_mismatch);
                   end;

                   { filter MUL, which requires special handling }
                   if op=A_MUL then
                     begin
                       popeax:=false;
                       popedx:=false;
                       { here you need to free the symbol first }
                       { left.location and right.location must }
                       { only be freed when they are really released,  }
                       { because the optimizer NEEDS correct regalloc  }
                       { info!!! (JM)                                  }
                       clear_location(location);

                 { the location.register will be filled in later (JM) }
                       location.loc:=LOC_REGISTER;
{$IfNDef NoShlMul}
                       if right.nodetype=ordconstn then
                        swapleftright;
                       If (left.nodetype = ordconstn) and
                          ispowerof2(tordconstnode(left).value, power) and
                          not(cs_check_overflow in aktlocalswitches) then
                         Begin
                           { This release will be moved after the next }
                           { instruction by the optimizer. No need to  }
                           { release left.location, since it's a   }
                           { constant (JM)                             }
                           release_loc(right.location);
                           location.register := getregisterint;
                           emitloadord2reg(right.location,torddef(u32bittype.def),location.register,false);
                           emit_const_reg(A_SHL,S_L,power,location.register)
                         End
                       Else
                        Begin
{$EndIf NoShlMul}
                         regstopush := $ff;
                         remove_non_regvars_from_loc(right.location,regstopush);
                         remove_non_regvars_from_loc(left.location,regstopush);
                         { now, regstopush does NOT contain EAX and/or EDX if they are }
                         { used in either the left or the right location, excepts if   }
                         {they are regvars. It DOES contain them if they are used in   }
                         { another location (JM)                                       }
                         if not(R_EAX in unused) and ((regstopush and ($80 shr byte(R_EAX))) <> 0) then
                          begin
                           emit_reg(A_PUSH,S_L,R_EAX);
                           popeax:=true;
                          end;
                         if not(R_EDX in unused) and ((regstopush and ($80 shr byte(R_EDX))) <> 0) then
                          begin
                           emit_reg(A_PUSH,S_L,R_EDX);
                           popedx:=true;
                          end;
                         { left.location can be R_EAX !!! }
                         getexplicitregister32(R_EDI);
                         { load the left value }
                         emitloadord2reg(left.location,torddef(u32bittype.def),R_EDI,true);
                         release_loc(left.location);
                         { allocate EAX }
                         if R_EAX in unused then
                           exprasmList.concat(Tairegalloc.Alloc(R_EAX));
                         { load he right value }
                         emitloadord2reg(right.location,torddef(u32bittype.def),R_EAX,true);
                         release_loc(right.location);
                         { allocate EAX if it isn't yet allocated (JM) }
                         if (R_EAX in unused) then
                           exprasmList.concat(Tairegalloc.Alloc(R_EAX));
                         { also allocate EDX, since it is also modified by }
                         { a mul (JM)                                      }
                         if R_EDX in unused then
                           exprasmList.concat(Tairegalloc.Alloc(R_EDX));
                         emit_reg(A_MUL,S_L,R_EDI);
                         ungetregister32(R_EDI);
                         if R_EDX in unused then
                           exprasmList.concat(Tairegalloc.DeAlloc(R_EDX));
                         if R_EAX in unused then
                           exprasmList.concat(Tairegalloc.DeAlloc(R_EAX));
                         location.register := getregisterint;
                         emit_reg_reg(A_MOV,S_L,R_EAX,location.register);
                         if popedx then
                          emit_reg(A_POP,S_L,R_EDX);
                         if popeax then
                          emit_reg(A_POP,S_L,R_EAX);
{$IfNDef NoShlMul}
                        End;
{$endif NoShlMul}
                       SetResultLocation(false,true);
                       exit;
                     end;

                   { Convert flags to register first }
                   if (left.location.loc=LOC_FLAGS) then
                    locflags2reg(left.location,opsize);
                   if (right.location.loc=LOC_FLAGS) then
                    locflags2reg(right.location,opsize);

                   { left and right no register?  }
                   { then one must be demanded    }
                   if (left.location.loc<>LOC_REGISTER) and
                      (right.location.loc<>LOC_REGISTER) then
                     begin
                        { register variable ? }
                        if (left.location.loc=LOC_CREGISTER) then
                          begin
                             { it is OK if this is the destination }
                             if is_in_dest then
                               begin
                                  hregister:=location.register;
                                  emit_reg_reg(A_MOV,opsize,left.location.register,
                                    hregister);
                               end
                             else
                             if cmpop then
                               begin
                                  { do not disturb the register }
                                  hregister:=location.register;
                               end
                             else
                               begin
                                  case opsize of
                                     S_L : hregister:=getregisterint;
                                     S_B : hregister:=reg32toreg8(getregisterint);
                                  end;
                                  emit_reg_reg(A_MOV,opsize,left.location.register,
                                    hregister);
                               end
                          end
                        else
                          begin
                             ungetiftemp(left.location.reference);
                             del_reference(left.location.reference);
                             if is_in_dest then
                               begin
                                  hregister:=location.register;
                                  emit_ref_reg(A_MOV,opsize,
                                    newreference(left.location.reference),hregister);
                               end
                             else
                               begin
                                  { first give free, then demand new register }
                                  case opsize of
                                     S_L : hregister:=getregisterint;
                                     S_W : hregister:=reg32toreg16(getregisterint);
                                     S_B : hregister:=reg32toreg8(getregisterint);
                                  end;
                                  emit_ref_reg(A_MOV,opsize,
                                    newreference(left.location.reference),hregister);
                               end;
                          end;
                        clear_location(location);
                        location.loc:=LOC_REGISTER;
                        location.register:=hregister;
                     end
                   else
                     { if on the right the register then swap }
                     if not(noswap) and (right.location.loc=LOC_REGISTER) then
                       begin
                          swap_location(location,right.location);

                          { newly swapped also set swapped flag }
                          toggleflag(nf_swaped);
                       end;
                   { at this point, location.loc should be LOC_REGISTER }
                   { and location.register should be a valid register   }
                   { containing the left result                     }

                    if right.location.loc<>LOC_REGISTER then
                     begin
                        if (nodetype=subn) and (nf_swaped in flags) then
                          begin
                             if right.location.loc=LOC_CREGISTER then
                               begin
                                  if extra_not then
                                    emit_reg(A_NOT,opsize,location.register);
                                  getexplicitregister32(R_EDI);
                                  emit_reg_reg(A_MOV,opsize,right.location.register,R_EDI);
                                  emit_reg_reg(op,opsize,location.register,R_EDI);
                                  emit_reg_reg(A_MOV,opsize,R_EDI,location.register);
                                  ungetregister32(R_EDI);
                               end
                             else
                               begin
                                  if extra_not then
                                    emit_reg(A_NOT,opsize,location.register);
                                  getexplicitregister32(R_EDI);
                                  emit_ref_reg(A_MOV,opsize,
                                    newreference(right.location.reference),R_EDI);
                                  emit_reg_reg(op,opsize,location.register,R_EDI);
                                  emit_reg_reg(A_MOV,opsize,R_EDI,location.register);
                                  ungetregister32(R_EDI);
                                  ungetiftemp(right.location.reference);
                                  del_reference(right.location.reference);
                               end;
                          end
                        else
                          begin
                             if (right.nodetype=ordconstn) and
                                (op=A_CMP) and
                                (tordconstnode(right).value=0) then
                               begin
                                  emit_reg_reg(A_TEST,opsize,location.register,
                                    location.register);
                               end
                             else if (right.nodetype=ordconstn) and
                                (op=A_ADD) and
                                (tordconstnode(right).value=1) and
                                not(cs_check_overflow in aktlocalswitches) then
                               begin
                                  emit_reg(A_INC,opsize,
                                    location.register);
                               end
                             else if (right.nodetype=ordconstn) and
                                (op=A_SUB) and
                                (tordconstnode(right).value=1) and
                                not(cs_check_overflow in aktlocalswitches) then
                               begin
                                  emit_reg(A_DEC,opsize,
                                    location.register);
                               end
                             else if (right.nodetype=ordconstn) and
                                (op=A_IMUL) and
                                (ispowerof2(tordconstnode(right).value,power)) and
                                not(cs_check_overflow in aktlocalswitches) then
                               begin
                                  emit_const_reg(A_SHL,opsize,power,
                                    location.register);
                               end
                             else
                               begin
                                  if (right.location.loc=LOC_CREGISTER) then
                                    begin
                                       if extra_not then
                                         begin
                                            getexplicitregister32(R_EDI);
                                            emit_reg_reg(A_MOV,S_L,right.location.register,R_EDI);
                                            emit_reg(A_NOT,S_L,R_EDI);
                                            emit_reg_reg(A_AND,S_L,R_EDI,
                                              location.register);
                                            ungetregister32(R_EDI);
                                         end
                                       else
                                         begin
                                            emit_reg_reg(op,opsize,right.location.register,
                                              location.register);
                                         end;
                                    end
                                  else
                                    begin
                                       if extra_not then
                                         begin
                                            getexplicitregister32(R_EDI);
                                            emit_ref_reg(A_MOV,S_L,newreference(
                                              right.location.reference),R_EDI);
                                            emit_reg(A_NOT,S_L,R_EDI);
                                            emit_reg_reg(A_AND,S_L,R_EDI,
                                              location.register);
                                            ungetregister32(R_EDI);
                                         end
                                       else
                                         begin
                                            emit_ref_reg(op,opsize,newreference(
                                              right.location.reference),location.register);
                                         end;
                                       ungetiftemp(right.location.reference);
                                       del_reference(right.location.reference);
                                    end;
                               end;
                          end;
                     end
                   else
                     begin
                        { when swapped another result register }
                        if (nodetype=subn) and (nf_swaped in flags) then
                          begin
                             if extra_not then
                               emit_reg(A_NOT,S_L,location.register);

                             emit_reg_reg(op,opsize,
                               location.register,right.location.register);
                               swap_location(location,right.location);
                               { newly swapped also set swapped flag }
                               { just to maintain ordering         }
                               toggleflag(nf_swaped);
                          end
                        else
                          begin
                             if extra_not then
                               emit_reg(A_NOT,S_L,right.location.register);
                             emit_reg_reg(op,opsize,
                               right.location.register,
                               location.register);
                          end;
                        case opsize of
                           S_L : ungetregister32(right.location.register);
                           S_B : ungetregister32(reg8toreg32(right.location.register));
                        end;
                     end;

                   if cmpop then
                     case opsize of
                        S_L : ungetregister32(location.register);
                        S_B : ungetregister32(reg8toreg32(location.register));
                     end;

                   { only in case of overflow operations }
                   { produce overflow code }
                   { we must put it here directly, because sign of operation }
                   { is in unsigned VAR!!                                   }
                   if mboverflow then
                    begin
                      if cs_check_overflow in aktlocalswitches  then
                       begin
                         getlabel(hl4);
                         if unsigned then
                          emitjmp(C_NB,hl4)
                         else
                          emitjmp(C_NO,hl4);
                         emitcall('FPC_OVERFLOW');
                         emitlab(hl4);
                       end;
                    end;
                end
              else

              { Char type }
                if ((left.resulttype.def.deftype=orddef) and
                    (torddef(left.resulttype.def).typ=uchar)) or
              { enumeration type 16 bit }
                   ((left.resulttype.def.deftype=enumdef) and
                    (left.resulttype.def.size=1)) then
                 begin
                   case nodetype of
                      ltn,lten,gtn,gten,
                      equaln,unequaln :
                                cmpop:=true;
                      else CGMessage(type_e_mismatch);
                   end;
                   unsigned:=true;
                   { left and right no register? }
                   { the one must be demanded    }
                   if (location.loc<>LOC_REGISTER) and
                     (right.location.loc<>LOC_REGISTER) then
                     begin
                        if location.loc=LOC_CREGISTER then
                          begin
                             if cmpop then
                               { do not disturb register }
                               hregister:=location.register
                             else
                               begin
                                  hregister:=reg32toreg8(getregisterint);
                                  emit_reg_reg(A_MOV,S_B,location.register,
                                    hregister);
                               end;
                          end
                        else
                          begin
                             del_reference(location.reference);

                             { first give free then demand new register }
                             hregister:=reg32toreg8(getregisterint);
                             emit_ref_reg(A_MOV,S_B,newreference(location.reference),
                               hregister);
                          end;
                        clear_location(location);
                        location.loc:=LOC_REGISTER;
                        location.register:=hregister;
                     end;

                   { now p always a register }

                   if (right.location.loc=LOC_REGISTER) and
                      (location.loc<>LOC_REGISTER) then
                     begin
                       swap_location(location,right.location);
                       { newly swapped also set swapped flag }
                       toggleflag(nf_swaped);
                     end;

                   if right.location.loc<>LOC_REGISTER then
                     begin
                        if right.location.loc=LOC_CREGISTER then
                          begin
                             emit_reg_reg(A_CMP,S_B,
                                right.location.register,location.register);
                          end
                        else
                          begin
                             emit_ref_reg(A_CMP,S_B,newreference(
                                right.location.reference),location.register);
                             del_reference(right.location.reference);
                          end;
                     end
                   else
                     begin
                        emit_reg_reg(A_CMP,S_B,right.location.register,
                          location.register);
                        ungetregister32(reg8toreg32(right.location.register));
                     end;
                   ungetregister32(reg8toreg32(location.register));
                end
              else
              { 16 bit enumeration type }
                if ((left.resulttype.def.deftype=enumdef) and
                    (left.resulttype.def.size=2)) then
                 begin
                   case nodetype of
                      ltn,lten,gtn,gten,
                      equaln,unequaln :
                                cmpop:=true;
                      else CGMessage(type_e_mismatch);
                   end;
                   unsigned:=true;
                   { left and right no register? }
                   { the one must be demanded    }
                   if (location.loc<>LOC_REGISTER) and
                     (right.location.loc<>LOC_REGISTER) then
                     begin
                        if location.loc=LOC_CREGISTER then
                          begin
                             if cmpop then
                               { do not disturb register }
                               hregister:=location.register
                             else
                               begin
                                  hregister:=reg32toreg16(getregisterint);
                                  emit_reg_reg(A_MOV,S_W,location.register,
                                    hregister);
                               end;
                          end
                        else
                          begin
                             del_reference(location.reference);

                             { first give free then demand new register }
                             hregister:=reg32toreg16(getregisterint);
                             emit_ref_reg(A_MOV,S_W,newreference(location.reference),
                               hregister);
                          end;
                        clear_location(location);
                        location.loc:=LOC_REGISTER;
                        location.register:=hregister;
                     end;

                   { now p always a register }

                   if (right.location.loc=LOC_REGISTER) and
                      (location.loc<>LOC_REGISTER) then
                     begin
                       swap_location(location,right.location);
                       { newly swapped also set swapped flag }
                       toggleflag(nf_swaped);
                     end;

                   if right.location.loc<>LOC_REGISTER then
                     begin
                        if right.location.loc=LOC_CREGISTER then
                          begin
                             emit_reg_reg(A_CMP,S_W,
                                right.location.register,location.register);
                          end
                        else
                          begin
                             emit_ref_reg(A_CMP,S_W,newreference(
                                right.location.reference),location.register);
                             del_reference(right.location.reference);
                          end;
                     end
                   else
                     begin
                        emit_reg_reg(A_CMP,S_W,right.location.register,
                          location.register);
                        ungetregister32(reg16toreg32(right.location.register));
                     end;
                   ungetregister32(reg16toreg32(location.register));
                end
              else
              { 64 bit types }
              if is_64bitint(left.resulttype.def) then
                begin
                   mboverflow:=false;
                   cmpop:=false;
                   unsigned:=((left.resulttype.def.deftype=orddef) and
                       (torddef(left.resulttype.def).typ=u64bit)) or
                      ((right.resulttype.def.deftype=orddef) and
                       (torddef(right.resulttype.def).typ=u64bit));
                   case nodetype of
                      addn : begin
                                begin
                                  op:=A_ADD;
                                  op2:=A_ADC;
                                  mboverflow:=true;
                                end;
                             end;
                      subn : begin
                                op:=A_SUB;
                                op2:=A_SBB;
                                mboverflow:=true;
                             end;
                      ltn,lten,
                      gtn,gten,
                      equaln,unequaln:
                             begin
                               op:=A_CMP;
                               op2:=A_CMP;
                               cmpop:=true;
                             end;

                      xorn:
                        begin
                           op:=A_XOR;
                           op2:=A_XOR;
                        end;

                      orn:
                        begin
                           op:=A_OR;
                           op2:=A_OR;
                        end;

                      andn:
                        begin
                           op:=A_AND;
                           op2:=A_AND;
                        end;
                      muln:
                        ;
                   else
                     CGMessage(type_e_mismatch);
                   end;

                   if nodetype=muln then
                     begin
                       { should be handled in pass_1 (JM) }
                       internalerror(200109051);
                     end
                   else
                     begin
                        { left and right no register?  }
                        { then one must be demanded    }
                        if (left.location.loc<>LOC_REGISTER) and
                           (right.location.loc<>LOC_REGISTER) then
                          begin
                             { register variable ? }
                             if (left.location.loc=LOC_CREGISTER) then
                               begin
                                  { it is OK if this is the destination }
                                  if is_in_dest then
                                    begin
                                       hregister:=location.registerlow;
                                       hregister2:=location.registerhigh;
                                       emit_reg_reg(A_MOV,S_L,left.location.registerlow,
                                         hregister);
                                       emit_reg_reg(A_MOV,S_L,left.location.registerlow,
                                         hregister2);
                                    end
                                  else
                                  if cmpop then
                                    begin
                                       { do not disturb the register }
                                       hregister:=location.registerlow;
                                       hregister2:=location.registerhigh;
                                    end
                                  else
                                    begin
                                       hregister:=getregisterint;
                                       hregister2:=getregisterint;
                                       emit_reg_reg(A_MOV,S_L,left.location.registerlow,
                                         hregister);
                                       emit_reg_reg(A_MOV,S_L,left.location.registerhigh,
                                         hregister2);
                                    end
                               end
                             else
                               begin
                                  ungetiftemp(left.location.reference);
                                  del_reference(left.location.reference);
                                  if is_in_dest then
                                    begin
                                       hregister:=location.registerlow;
                                       hregister2:=location.registerhigh;
                                       emit_mov_ref_reg64(left.location.reference,hregister,hregister2);
                                    end
                                  else
                                    begin
                                       hregister:=getregisterint;
                                       hregister2:=getregisterint;
                                       emit_mov_ref_reg64(left.location.reference,hregister,hregister2);
                                    end;
                               end;
                             clear_location(location);
                             location.loc:=LOC_REGISTER;
                             location.registerlow:=hregister;
                             location.registerhigh:=hregister2;
                          end
                        else
                          { if on the right the register then swap }
                          if not(noswap) and (right.location.loc=LOC_REGISTER) then
                            begin
                               swap_location(location,right.location);

                               { newly swapped also set swapped flag }
                               toggleflag(nf_swaped);
                            end;
                        { at this point, location.loc should be LOC_REGISTER }
                        { and location.register should be a valid register   }
                        { containing the left result                        }

                        if right.location.loc<>LOC_REGISTER then
                          begin
                             if (nodetype=subn) and (nf_swaped in flags) then
                               begin
                                  if right.location.loc=LOC_CREGISTER then
                                    begin
                                       getexplicitregister32(R_EDI);
                                       emit_reg_reg(A_MOV,opsize,right.location.register,R_EDI);
                                       emit_reg_reg(op,opsize,location.register,R_EDI);
                                       emit_reg_reg(A_MOV,opsize,R_EDI,location.register);
                                       ungetregister32(R_EDI);
                                       getexplicitregister32(R_EDI);
                                       emit_reg_reg(A_MOV,opsize,right.location.registerhigh,R_EDI);
                                       { the carry flag is still ok }
                                       emit_reg_reg(op2,opsize,location.registerhigh,R_EDI);
                                       emit_reg_reg(A_MOV,opsize,R_EDI,location.registerhigh);
                                       ungetregister32(R_EDI);
                                    end
                                  else
                                    begin
                                       getexplicitregister32(R_EDI);
                                       emit_ref_reg(A_MOV,opsize,
                                         newreference(right.location.reference),R_EDI);
                                       emit_reg_reg(op,opsize,location.registerlow,R_EDI);
                                       emit_reg_reg(A_MOV,opsize,R_EDI,location.registerlow);
                                       ungetregister32(R_EDI);
                                       getexplicitregister32(R_EDI);
                                       hr:=newreference(right.location.reference);
                                       inc(hr^.offset,4);
                                       emit_ref_reg(A_MOV,opsize,
                                         hr,R_EDI);
                                       { here the carry flag is still preserved }
                                       emit_reg_reg(op2,opsize,location.registerhigh,R_EDI);
                                       emit_reg_reg(A_MOV,opsize,R_EDI,
                                         location.registerhigh);
                                       ungetregister32(R_EDI);
                                       ungetiftemp(right.location.reference);
                                       del_reference(right.location.reference);
                                    end;
                               end
                             else if cmpop then
                               begin
                                  if (right.location.loc=LOC_CREGISTER) then
                                    begin
                                       emit_reg_reg(A_CMP,S_L,right.location.registerhigh,
                                          location.registerhigh);
                                       firstjmp64bitcmp;
                                       emit_reg_reg(A_CMP,S_L,right.location.registerlow,
                                          location.registerlow);
                                       secondjmp64bitcmp;
                                    end
                                  else
                                    begin
                                       hr:=newreference(right.location.reference);
                                       inc(hr^.offset,4);

                                       emit_ref_reg(A_CMP,S_L,
                                         hr,location.registerhigh);
                                       firstjmp64bitcmp;

                                       emit_ref_reg(A_CMP,S_L,newreference(
                                         right.location.reference),location.registerlow);
                                       secondjmp64bitcmp;

                                       emitjmp(C_None,falselabel);

                                       ungetiftemp(right.location.reference);
                                       del_reference(right.location.reference);
                                    end;
                               end
                             else
                               begin
                                  {
                                  if (right.nodetype=ordconstn) and
                                     (op=A_CMP) and
                                     (right.value=0) then
                                    begin
                                       emit_reg_reg(A_TEST,opsize,location.register,
                                         location.register);
                                    end
                                  else if (right.nodetype=ordconstn) and
                                     (op=A_IMUL) and
                                     (ispowerof2(right.value,power)) then
                                    begin
                                       emit_const_reg(A_SHL,opsize,power,
                                         location.register);
                                    end
                                  else
                                  }
                                    begin
                                       if (right.location.loc=LOC_CREGISTER) then
                                         begin
                                            emit_reg_reg(op,S_L,right.location.registerlow,
                                               location.registerlow);
                                            emit_reg_reg(op2,S_L,right.location.registerhigh,
                                               location.registerhigh);
                                         end
                                       else
                                         begin
                                            emit_ref_reg(op,S_L,newreference(
                                              right.location.reference),location.registerlow);
                                            hr:=newreference(right.location.reference);
                                            inc(hr^.offset,4);
                                            emit_ref_reg(op2,S_L,
                                              hr,location.registerhigh);
                                            ungetiftemp(right.location.reference);
                                            del_reference(right.location.reference);
                                         end;
                                    end;
                               end;
                          end
                        else
                          begin
                             { when swapped another result register }
                             if (nodetype=subn) and (nf_swaped in flags) then
                               begin
                                 emit_reg_reg(op,S_L,
                                    location.registerlow,
                                    right.location.registerlow);
                                 emit_reg_reg(op2,S_L,
                                    location.registerhigh,
                                    right.location.registerhigh);
                                  swap_location(location,right.location);
                                  { newly swapped also set swapped flag }
                                  { just to maintain ordering           }
                                  toggleflag(nf_swaped);
                               end
                             else if cmpop then
                               begin
                                  emit_reg_reg(A_CMP,S_L,
                                    right.location.registerhigh,
                                    location.registerhigh);
                                  firstjmp64bitcmp;
                                  emit_reg_reg(A_CMP,S_L,
                                    right.location.registerlow,
                                    location.registerlow);
                                  secondjmp64bitcmp;
                               end
                             else
                               begin
                                  emit_reg_reg(op,S_L,
                                    right.location.registerlow,
                                    location.registerlow);
                                  emit_reg_reg(op2,S_L,
                                    right.location.registerhigh,
                                    location.registerhigh);
                               end;
                             ungetregister32(right.location.registerlow);
                             ungetregister32(right.location.registerhigh);
                          end;

                        if cmpop then
                          begin
                             ungetregister32(location.registerlow);
                             ungetregister32(location.registerhigh);
                          end;

                        { only in case of overflow operations }
                        { produce overflow code }
                        { we must put it here directly, because sign of operation }
                        { is in unsigned VAR!!                              }
                        if mboverflow then
                         begin
                           if cs_check_overflow in aktlocalswitches  then
                            begin
                              getlabel(hl4);
                              if unsigned then
                               emitjmp(C_NB,hl4)
                              else
                               emitjmp(C_NO,hl4);
                              emitcall('FPC_OVERFLOW');
                              emitlab(hl4);
                            end;
                         end;
                        { we have LOC_JUMP as result }
                        if cmpop then
                          begin
                             clear_location(location);
                             location.loc:=LOC_JUMP;
                             cmpop:=false;
                          end;
                     end;
                end
              else
              { Floating point }
               if (left.resulttype.def.deftype=floatdef) then
                 begin
                    { real constants to the right, but only if it
                      isn't on the FPU stack, i.e. 1.0 or 0.0!
                    if (left.nodetype=realconstn) and
                      (left.location.loc<>LOC_FPU) then
                      swapleftright; obsolete, already swaped above PM }
                    cmpop:=false;
                    case nodetype of
                       addn : op:=A_FADDP;
                       muln : op:=A_FMULP;
                       subn : op:=A_FSUBP;
                       slashn : op:=A_FDIVP;
                       ltn,lten,gtn,gten,
                       equaln,unequaln : begin
                                            op:=A_FCOMPP;
                                            cmpop:=true;
                                         end;
                       else CGMessage(type_e_mismatch);
                    end;

                    if (right.location.loc<>LOC_FPU) then
                      begin
                         if right.location.loc=LOC_CFPUREGISTER then
                           begin
                              emit_reg( A_FLD,S_NO,
                                correct_fpuregister(right.location.register,fpuvaroffset));
                              inc(fpuvaroffset);
                            end
                         else
                            begin
                              floatload(tfloatdef(right.resulttype.def).typ,right.location.reference);
                              if pushedfpu then
                                ungetiftemp(right.location.reference);
                            end;
                         if (left.location.loc<>LOC_FPU) then
                           begin
                              if left.location.loc=LOC_CFPUREGISTER then
                                begin
                                   emit_reg( A_FLD,S_NO,
                                     correct_fpuregister(left.location.register,fpuvaroffset));
                                   inc(fpuvaroffset);
                                end
                              else
                                begin
                                  floatload(tfloatdef(left.resulttype.def).typ,left.location.reference);
                                  if pushedfpu then
                                     ungetiftemp(left.location.reference);
                                end;
                           end
                         { left was on the stack => swap }
                         else
                           toggleflag(nf_swaped);

                         { releases the right reference }
                         del_reference(right.location.reference);
                      end
                    { the nominator in st0 }
                    else if (left.location.loc<>LOC_FPU) then
                      begin
                         if left.location.loc=LOC_CFPUREGISTER then
                           begin
                              emit_reg( A_FLD,S_NO,
                                correct_fpuregister(left.location.register,fpuvaroffset));
                              inc(fpuvaroffset);
                           end
                         else
                           begin
                             floatload(tfloatdef(left.resulttype.def).typ,left.location.reference);
                             if pushedfpu then
                              ungetiftemp(left.location.reference);
                           end;
                      end
                    { fpu operands are always in the wrong order on the stack }
                    else
                      toggleflag(nf_swaped);

                    { releases the left reference }
                    if (left.location.loc in [LOC_MEM,LOC_REFERENCE]) then
                      del_reference(left.location.reference);

                    { if we swaped the tree nodes, then use the reverse operator }
                    if nf_swaped in flags then
                      begin
                         if (nodetype=slashn) then
                           op:=A_FDIVRP
                         else if (nodetype=subn) then
                           op:=A_FSUBRP;
                      end;
                    { to avoid the pentium bug
                    if (op=FDIVP) and (opt_processors=pentium) then
                      emitcall('EMUL_FDIVP')
                    else
                    }
                    { the Intel assemblers want operands }
                    if op<>A_FCOMPP then
                      begin
                         emit_reg_reg(op,S_NO,R_ST,R_ST1);
                         dec(fpuvaroffset);
                      end
                    else
                      begin
                         emit_none(op,S_NO);
                         dec(fpuvaroffset,2);
                      end;

                    { on comparison load flags }
                    if cmpop then
                     begin
                       if not(R_EAX in unused) then
                         begin
                           getexplicitregister32(R_EDI);
                           emit_reg_reg(A_MOV,S_L,R_EAX,R_EDI);
                         end;
                       emit_reg(A_FNSTSW,S_NO,R_AX);
                       emit_none(A_SAHF,S_NO);
                       if not(R_EAX in unused) then
                         begin
                           emit_reg_reg(A_MOV,S_L,R_EDI,R_EAX);
                           ungetregister32(R_EDI);
                         end;
                       if nf_swaped in flags then
                        begin
                          case nodetype of
                              equaln : resflags:=F_E;
                            unequaln : resflags:=F_NE;
                                 ltn : resflags:=F_A;
                                lten : resflags:=F_AE;
                                 gtn : resflags:=F_B;
                                gten : resflags:=F_BE;
                          end;
                        end
                       else
                        begin
                          case nodetype of
                              equaln : resflags:=F_E;
                            unequaln : resflags:=F_NE;
                                 ltn : resflags:=F_B;
                                lten : resflags:=F_BE;
                                 gtn : resflags:=F_A;
                                gten : resflags:=F_AE;
                          end;
                        end;
                       clear_location(location);
                       location.loc:=LOC_FLAGS;
                       location.resflags:=resflags;
                       cmpop:=false;
                     end
                    else
                     begin
                        clear_location(location);
                        location.loc:=LOC_FPU;
                     end;
                 end
{$ifdef SUPPORT_MMX}
               else

               { MMX Arrays }
                if is_mmx_able_array(left.resulttype.def) then
                 begin
                   cmpop:=false;
                   mmxbase:=mmx_type(left.resulttype.def);
                   case nodetype of
                      addn : begin
                                if (cs_mmx_saturation in aktlocalswitches) then
                                  begin
                                     case mmxbase of
                                        mmxs8bit:
                                          op:=A_PADDSB;
                                        mmxu8bit:
                                          op:=A_PADDUSB;
                                        mmxs16bit,mmxfixed16:
                                          op:=A_PADDSB;
                                        mmxu16bit:
                                          op:=A_PADDUSW;
                                     end;
                                  end
                                else
                                  begin
                                     case mmxbase of
                                        mmxs8bit,mmxu8bit:
                                          op:=A_PADDB;
                                        mmxs16bit,mmxu16bit,mmxfixed16:
                                          op:=A_PADDW;
                                        mmxs32bit,mmxu32bit:
                                          op:=A_PADDD;
                                     end;
                                  end;
                             end;
                      muln : begin
                                case mmxbase of
                                   mmxs16bit,mmxu16bit:
                                     op:=A_PMULLW;
                                   mmxfixed16:
                                     op:=A_PMULHW;
                                end;
                             end;
                      subn : begin
                                if (cs_mmx_saturation in aktlocalswitches) then
                                  begin
                                     case mmxbase of
                                        mmxs8bit:
                                          op:=A_PSUBSB;
                                        mmxu8bit:
                                          op:=A_PSUBUSB;
                                        mmxs16bit,mmxfixed16:
                                          op:=A_PSUBSB;
                                        mmxu16bit:
                                          op:=A_PSUBUSW;
                                     end;
                                  end
                                else
                                  begin
                                     case mmxbase of
                                        mmxs8bit,mmxu8bit:
                                          op:=A_PSUBB;
                                        mmxs16bit,mmxu16bit,mmxfixed16:
                                          op:=A_PSUBW;
                                        mmxs32bit,mmxu32bit:
                                          op:=A_PSUBD;
                                     end;
                                  end;
                             end;
                      {
                      ltn,lten,gtn,gten,
                      equaln,unequaln :
                             begin
                                op:=A_CMP;
                                cmpop:=true;
                             end;
                      }
                      xorn:
                        op:=A_PXOR;
                      orn:
                        op:=A_POR;
                      andn:
                        op:=A_PAND;
                      else CGMessage(type_e_mismatch);
                   end;
                   { left and right no register?  }
                   { then one must be demanded    }
                   if (left.location.loc<>LOC_MMXREGISTER) and
                     (right.location.loc<>LOC_MMXREGISTER) then
                     begin
                        { register variable ? }
                        if (left.location.loc=LOC_CMMXREGISTER) then
                          begin
                             { it is OK if this is the destination }
                             if is_in_dest then
                               begin
                                  hregister:=location.register;
                                  emit_reg_reg(A_MOVQ,S_NO,left.location.register,
                                    hregister);
                               end
                             else
                               begin
                                  hregister:=getregistermmx;
                                  emit_reg_reg(A_MOVQ,S_NO,left.location.register,
                                    hregister);
                               end
                          end
                        else
                          begin
                             del_reference(left.location.reference);

                             if is_in_dest then
                               begin
                                  hregister:=location.register;
                                  emit_ref_reg(A_MOVQ,S_NO,
                                    newreference(left.location.reference),hregister);
                               end
                             else
                               begin
                                  hregister:=getregistermmx;
                                  emit_ref_reg(A_MOVQ,S_NO,
                                    newreference(left.location.reference),hregister);
                               end;
                          end;
                        clear_location(location);
                        location.loc:=LOC_MMXREGISTER;
                        location.register:=hregister;
                     end
                   else
                     { if on the right the register then swap }
                     if (right.location.loc=LOC_MMXREGISTER) then
                       begin
                          swap_location(location,right.location);
                          { newly swapped also set swapped flag }
                          toggleflag(nf_swaped);
                       end;
                   { at this point, location.loc should be LOC_MMXREGISTER }
                   { and location.register should be a valid register      }
                   { containing the left result                        }
                   if right.location.loc<>LOC_MMXREGISTER then
                     begin
                        if (nodetype=subn) and (nf_swaped in flags) then
                          begin
                             if right.location.loc=LOC_CMMXREGISTER then
                               begin
                                  emit_reg_reg(A_MOVQ,S_NO,right.location.register,R_MM7);
                                  emit_reg_reg(op,S_NO,location.register,R_MM0);
                                  emit_reg_reg(A_MOVQ,S_NO,R_MM7,location.register);
                               end
                             else
                               begin
                                  emit_ref_reg(A_MOVQ,S_NO,
                                    newreference(right.location.reference),R_MM7);
                                  emit_reg_reg(op,S_NO,location.register,
                                    R_MM7);
                                  emit_reg_reg(A_MOVQ,S_NO,
                                    R_MM7,location.register);
                                  del_reference(right.location.reference);
                               end;
                          end
                        else
                          begin
                             if (right.location.loc=LOC_CREGISTER) then
                               begin
                                  emit_reg_reg(op,S_NO,right.location.register,
                                    location.register);
                               end
                             else
                               begin
                                  emit_ref_reg(op,S_NO,newreference(
                                    right.location.reference),location.register);
                                  del_reference(right.location.reference);
                               end;
                          end;
                     end
                   else
                     begin
                        { when swapped another result register }
                        if (nodetype=subn) and (nf_swaped in flags) then
                          begin
                             emit_reg_reg(op,S_NO,
                               location.register,right.location.register);
                             swap_location(location,right.location);
                             { newly swapped also set swapped flag }
                             { just to maintain ordering         }
                             toggleflag(nf_swaped);
                          end
                        else
                          begin
                             emit_reg_reg(op,S_NO,
                               right.location.register,
                               location.register);
                          end;
                        ungetregistermmx(right.location.register);
                     end;
                end
{$endif SUPPORT_MMX}
              else CGMessage(type_e_mismatch);
           end;
       SetResultLocation(cmpop,unsigned);
    end;

begin
   caddnode:=ti386addnode;
end.
{
  $Log$
  Revision 1.28  2001-12-30 17:24:46  jonas
    * range checking is now processor independent (part in cgobj, part in
    cg64f32) and should work correctly again (it needed some changes after
    the changes of the low and high of tordef's to int64)
  * maketojumpbool() is now processor independent (in ncgutil)
  * getregister32 is now called getregisterint

  Revision 1.27  2001/12/29 15:29:58  jonas
    * powerpc/cgcpu.pas compiles :)
    * several powerpc-related fixes
    * cpuasm unit is now based on common tainst unit
    + nppcmat unit for powerpc (almost complete)

  Revision 1.25  2001/10/12 13:51:51  jonas
    * fixed internalerror(10) due to previous fpu overflow fixes ("merged")
    * fixed bug in n386add (introduced after compilerproc changes for string
      operations) where calcregisters wasn't called for shortstring addnodes
    * NOTE: from now on, the location of a binary node must now always be set
       before you call calcregisters() for it

  Revision 1.24  2001/09/17 21:29:13  peter
    * merged netbsd, fpu-overflow from fixes branch

  Revision 1.23  2001/09/05 15:22:09  jonas
    * made multiplying, dividing and mod'ing of int64 and qword processor
      independent with compilerprocs (+ small optimizations by using shift/and
      where possible)

  Revision 1.22  2001/09/04 11:38:55  jonas
    + searchsystype() and searchsystype() functions in symtable
    * changed ninl and nadd to use these functions
    * i386 set comparison functions now return their results in al instead
      of in the flags so that they can be sued as compilerprocs
    - removed all processor specific code from n386add.pas that has to do
      with set handling, it's now all done in nadd.pas
    * fixed fpc_set_contains_sets in genset.inc
    * fpc_set_in_byte is now coded inline in n386set.pas and doesn't use a
      helper anymore
    * some small fixes in compproc.inc/set.inc regarding the declaration of
      internal helper types (fpc_small_set and fpc_normal_set)

  Revision 1.21  2001/09/03 13:27:42  jonas
    * compilerproc implementation of set addition/substraction/...
    * changed the declaration of some set helpers somewhat to accomodate the
      above change
    * i386 still uses the old code for comparisons of sets, because its
      helpers return the results in the flags
    * dummy tc_normal_2_small_set type conversion because I need the original
      resulttype of the set add nodes
    NOTE: you have to start a cycle with 1.0.5!

  Revision 1.20  2001/08/30 15:43:14  jonas
    * converted adding/comparing of strings to compileproc. Note that due
      to the way the shortstring helpers for i386 are written, they are
      still handled by the old code (reason: fpc_shortstr_compare returns
      results in the flags instead of in eax and fpc_shortstr_concat
      has wierd parameter conventions). The compilerproc stuff should work
      fine with the generic implementations though.
    * removed some nested comments warnings

  Revision 1.19  2001/08/29 17:50:45  jonas
    * removed unused var

  Revision 1.18  2001/08/29 12:03:23  jonas
    * fixed wrong regalloc info around FPC_MUL/DIV/MOD_INT64/QWORD calls
    * fixed partial result overwriting with the above calls too

  Revision 1.17  2001/08/26 13:36:55  florian
    * some cg reorganisation
    * some PPC updates

  Revision 1.16  2001/07/08 21:00:16  peter
    * various widestring updates, it works now mostly without charset
      mapping supported

  Revision 1.15  2001/06/25 14:11:37  jonas
    * fixed set bug discovered by Carl (merged)

  Revision 1.14  2001/06/18 20:36:25  peter
    * -Ur switch (merged)
    * masm fixes (merged)
    * quoted filenames for go32v2 and win32

  Revision 1.13  2001/05/27 14:30:56  florian
    + some widestring stuff added

  Revision 1.12  2001/05/06 17:12:14  jonas
    * fixed an IE10 and another bug with [var1..var2] construct

  Revision 1.11  2001/04/13 01:22:18  peter
    * symtable change to classes
    * range check generation and errors fixed, make cycle DEBUG=1 works
    * memory leaks fixed

  Revision 1.10  2001/04/02 21:20:36  peter
    * resulttype rewrite

  Revision 1.9  2000/12/31 11:14:11  jonas
    + implemented/fixed docompare() mathods for all nodes (not tested)
    + nopt.pas, nadd.pas, i386/n386opt.pas: optimized nodes for adding strings
      and constant strings/chars together
    * n386add.pas: don't copy temp strings (of size 256) to another temp string
      when adding

  Revision 1.8  2000/12/25 00:07:32  peter
    + new tlinkedlist class (merge of old tstringqueue,tcontainer and
      tlinkedlist objects)

  Revision 1.7  2000/12/16 15:56:18  jonas
    - removed all ifdef cardinalmulfix code

  Revision 1.6  2000/12/05 11:44:32  jonas
    + new integer regvar handling, should be much more efficient

  Revision 1.5  2000/11/29 00:30:45  florian
    * unused units removed from uses clause
    * some changes for widestrings

  Revision 1.4  2000/11/13 11:30:56  florian
    * some bugs with interfaces and NIL fixed

  Revision 1.3  2000/11/04 14:25:23  florian
    + merged Attila's changes for interfaces, not tested yet

  Revision 1.2  2000/10/31 22:02:56  peter
    * symtable splitted, no real code changes

  Revision 1.1  2000/10/15 09:33:31  peter
    * moved n386*.pas to i386/ cpu_target dir

  Revision 1.6  2000/10/14 10:14:47  peter
    * moehrendorf oct 2000 rewrite

  Revision 1.5  2000/09/30 16:08:45  peter
    * more cg11 updates

  Revision 1.4  2000/09/24 15:06:18  peter
    * use defines.inc

  Revision 1.3  2000/09/22 22:42:52  florian
    * more fixes

  Revision 1.2  2000/09/21 12:24:22  jonas
    * small fix to my changes for full boolean evaluation support (moved
      opsize determination for boolean operations back in boolean
      processing block)
    + full boolean evaluation support (from cg386add)

  Revision 1.1  2000/09/20 21:23:32  florian
    * initial revision
}