freepascal.compiler/compiler/cgi386ad.inc

{
    $Id$
    Copyright (c) 1993-98 by Florian Klaempfl

    This include file generates i386+ assembler from the parse tree

    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.

 ****************************************************************************
}

    procedure secondas(var p : ptree);

      var
         pushed : tpushed;

      begin
         secondpass(p^.left);
         { save all used registers }
         pushusedregisters(pushed,$ff);

         { push instance to check: }
         case p^.left^.location.loc of
            LOC_REGISTER,LOC_CREGISTER:
              exprasmlist^.concat(new(pai386,op_reg(A_PUSH,
                S_L,p^.left^.location.register)));
            LOC_MEM,LOC_REFERENCE:
              exprasmlist^.concat(new(pai386,op_ref(A_PUSH,
                S_L,newreference(p^.left^.location.reference))));
            else internalerror(100);
         end;

         { we doesn't modifiy the left side, we check only the type }
         set_location(p^.location,p^.left^.location);

         { generate type checking }
         secondpass(p^.right);
         case p^.right^.location.loc of
            LOC_REGISTER,LOC_CREGISTER:
              begin
                 exprasmlist^.concat(new(pai386,op_reg(A_PUSH,
                   S_L,p^.right^.location.register)));
                 ungetregister32(p^.right^.location.register);
              end;
            LOC_MEM,LOC_REFERENCE:
              begin
                 exprasmlist^.concat(new(pai386,op_ref(A_PUSH,
                   S_L,newreference(p^.right^.location.reference))));
                 del_reference(p^.right^.location.reference);
              end;
            else internalerror(100);
         end;
         emitcall('DO_AS',true);
         { restore register, this restores automatically the }
         { result                                            }
         popusedregisters(pushed);
      end;

    procedure secondloadvmt(var p : ptree);

      begin
         p^.location.register:=getregister32;
         exprasmlist^.concat(new(pai386,op_csymbol_reg(A_MOV,
            S_L,newcsymbol(pobjectdef(pclassrefdef(p^.resulttype)^.definition)^.vmt_mangledname,0),
            p^.location.register)));
      end;

    procedure secondis(var p : ptree);

      var
         pushed : tpushed;

      begin
         { save all used registers }
         pushusedregisters(pushed,$ff);
         secondpass(p^.left);
         p^.location.loc:=LOC_FLAGS;
         p^.location.resflags:=F_NE;

         { push instance to check: }
         case p^.left^.location.loc of
            LOC_REGISTER,LOC_CREGISTER:
              begin
                 exprasmlist^.concat(new(pai386,op_reg(A_PUSH,
                   S_L,p^.left^.location.register)));
                 ungetregister32(p^.left^.location.register);
              end;
            LOC_MEM,LOC_REFERENCE:
              begin
                 exprasmlist^.concat(new(pai386,op_ref(A_PUSH,
                   S_L,newreference(p^.left^.location.reference))));
                 del_reference(p^.left^.location.reference);
              end;
            else internalerror(100);
         end;

         { generate type checking }
         secondpass(p^.right);
         case p^.right^.location.loc of
            LOC_REGISTER,LOC_CREGISTER:
              begin
                 exprasmlist^.concat(new(pai386,op_reg(A_PUSH,
                   S_L,p^.right^.location.register)));
                 ungetregister32(p^.right^.location.register);
              end;
            LOC_MEM,LOC_REFERENCE:
              begin
                 exprasmlist^.concat(new(pai386,op_ref(A_PUSH,
                   S_L,newreference(p^.right^.location.reference))));
                 del_reference(p^.right^.location.reference);
              end;
            else internalerror(100);
         end;
         emitcall('DO_IS',true);
         exprasmlist^.concat(new(pai386,op_reg_reg(A_OR,S_B,R_AL,R_AL)));
         popusedregisters(pushed);
      end;

    procedure setaddresult(cmpop,unsigned : boolean;var p :ptree);
      var
         flags : tresflags;
      begin
         if (p^.left^.resulttype^.deftype<>stringdef) and
            not ((p^.left^.resulttype^.deftype=setdef) and
               (psetdef(p^.left^.resulttype)^.settype<>smallset)) then
           begin
              { this can be useful if for instance length(string) is called }
              if (p^.left^.location.loc=LOC_REFERENCE) or
                 (p^.left^.location.loc=LOC_MEM) then
                ungetiftemp(p^.left^.location.reference);
              if (p^.right^.location.loc=LOC_REFERENCE) or
                 (p^.right^.location.loc=LOC_MEM) then
                ungetiftemp(p^.right^.location.reference);
           end;
         { in case of comparison operation the put result in the flags }
         if cmpop then
           begin
              if not(unsigned) then
                begin
                   if p^.swaped then
                     case p^.treetype of
                        equaln : flags:=F_E;
                        unequaln : flags:=F_NE;
                        ltn : flags:=F_G;
                        lten : flags:=F_GE;
                        gtn : flags:=F_L;
                        gten : flags:=F_LE;
                     end
                   else
                     case p^.treetype of
                        equaln : flags:=F_E;
                        unequaln : flags:=F_NE;
                        ltn : flags:=F_L;
                        lten : flags:=F_LE;
                        gtn : flags:=F_G;
                        gten : flags:=F_GE;
                     end;
                end
              else
                begin
                   if p^.swaped then
                     case p^.treetype of
                        equaln : flags:=F_E;
                        unequaln : flags:=F_NE;
                        ltn : flags:=F_A;
                        lten : flags:=F_AE;
                        gtn : flags:=F_B;
                        gten : flags:=F_BE;
                     end
                   else
                     case p^.treetype of
                        equaln : flags:=F_E;
                        unequaln : flags:=F_NE;
                        ltn : flags:=F_B;
                        lten : flags:=F_BE;
                        gtn : flags:=F_A;
                        gten : flags:=F_AE;
                     end;
                end;
              p^.location.loc:=LOC_FLAGS;
              p^.location.resflags:=flags;
           end;
      end;


  procedure secondaddstring(var p : ptree);

    var
       swapp : ptree;
       pushedregs : tpushed;
       href : treference;
       pushed,cmpop : boolean;

    begin
       { string operations are not commutative }
       if p^.swaped then
         begin
            swapp:=p^.left;
            p^.left:=p^.right;
            p^.right:=swapp;
            { because of jump being produced at comparison below: }
            p^.swaped:=not(p^.swaped);
         end;
       case p^.treetype of
          addn :
            begin
               cmpop:=false;
               secondpass(p^.left);
               if (p^.left^.treetype<>addn) then
                 begin
                    { can only reference be }
                    { string in register would be funny    }
                    { therefore produce a temporary string }

                    { release the registers }
                    del_reference(p^.left^.location.reference);
                    gettempofsizereference(256,href);
                    copystring(href,p^.left^.location.reference,255);
                    ungetiftemp(p^.left^.location.reference);

                    { does not hurt: }
                    p^.left^.location.loc:=LOC_MEM;
                    p^.left^.location.reference:=href;
                 end;

               secondpass(p^.right);

               { on the right we do not need the register anymore too }
               del_reference(p^.right^.location.reference);
{               if p^.right^.resulttype^.deftype=orddef then
                begin
                  pushusedregisters(pushedregs,$ff);
                  exprasmlist^.concat(new(pai386,op_ref_reg(
                     A_LEA,S_L,newreference(p^.left^.location.reference),R_EDI)));
                  exprasmlist^.concat(new(pai386,op_reg_reg(
                     A_XOR,S_L,R_EBX,R_EBX)));
                  reset_reference(href);
                  href.base:=R_EDI;
                  exprasmlist^.concat(new(pai386,op_ref_reg(
                     A_MOV,S_B,newreference(href),R_BL)));
                  exprasmlist^.concat(new(pai386,op_reg(
                     A_INC,S_L,R_EBX)));
                  exprasmlist^.concat(new(pai386,op_reg_ref(
                     A_MOV,S_B,R_BL,newreference(href))));
                  href.index:=R_EBX;
                  if p^.right^.treetype=ordconstn then
                    exprasmlist^.concat(new(pai386,op_const_ref(
                       A_MOV,S_L,p^.right^.value,newreference(href))))
                  else
                   begin
                     if p^.right^.location.loc in [LOC_CREGISTER,LOC_REGISTER] then
                      exprasmlist^.concat(new(pai386,op_reg_ref(
                        A_MOV,S_B,p^.right^.location.register,newreference(href))))
                     else
                      begin
                        exprasmlist^.concat(new(pai386,op_ref_reg(
                          A_MOV,S_L,newreference(p^.right^.location.reference),R_EAX)));
                        exprasmlist^.concat(new(pai386,op_reg_ref(
                          A_MOV,S_B,R_AL,newreference(href))));
                      end;
                   end;
                  popusedregisters(pushedregs);
                end
               else }
                begin
                  pushusedregisters(pushedregs,$ff);
                  emitpushreferenceaddr(p^.left^.location.reference);
                  emitpushreferenceaddr(p^.right^.location.reference);
                  emitcall('STRCONCAT',true);
                  maybe_loadesi;
                  popusedregisters(pushedregs);
                end;

               set_location(p^.location,p^.left^.location);
               ungetiftemp(p^.right^.location.reference);
            end;
          ltn,lten,gtn,gten,
          equaln,unequaln :
            begin
               cmpop:=true;
             { generate better code for s='' and s<>'' }
               if (p^.treetype in [equaln,unequaln]) and
                  (((p^.left^.treetype=stringconstn) and (p^.left^.values^='')) or
                   ((p^.right^.treetype=stringconstn) and (p^.right^.values^=''))) then
                 begin
                    secondpass(p^.left);
                    { are too few registers free? }
                    pushed:=maybe_push(p^.right^.registers32,p);
                    secondpass(p^.right);
                    if pushed then restore(p);
                    del_reference(p^.right^.location.reference);
                    del_reference(p^.left^.location.reference);
                    { only one node can be stringconstn }
                    { else pass 1 would have evaluted   }
                    { this node                         }
                    if p^.left^.treetype=stringconstn then
                      exprasmlist^.concat(new(pai386,op_const_ref(
                        A_CMP,S_B,0,newreference(p^.right^.location.reference))))
                    else
                      exprasmlist^.concat(new(pai386,op_const_ref(
                        A_CMP,S_B,0,newreference(p^.left^.location.reference))));
                 end
               else
                 begin
                    pushusedregisters(pushedregs,$ff);
                    secondpass(p^.left);
                    del_reference(p^.left^.location.reference);
                    emitpushreferenceaddr(p^.left^.location.reference);
                    secondpass(p^.right);
                    del_reference(p^.right^.location.reference);
                    emitpushreferenceaddr(p^.right^.location.reference);
                    emitcall('STRCMP',true);
                    maybe_loadesi;
                    popusedregisters(pushedregs);
                 end;
               ungetiftemp(p^.left^.location.reference);
               ungetiftemp(p^.right^.location.reference);
            end;
            else Message(sym_e_type_mismatch);
          end;
       setaddresult(cmpop,true,p);
    end;

    procedure secondadd(var p : ptree);

    { is also being used for xor, and "mul", "sub, or and comparative }
    { operators                                                       }

      label do_normal;

      var
         swapp : ptree;
         hregister : tregister;
         pushed,mboverflow,cmpop : boolean;
         op : tasmop;
         pushedregs : tpushed;
         flags : tresflags;
         otl,ofl : plabel;
         power : longint;
         href : treference;
         opsize : topsize;
         hl4: plabel;

         { true, if unsigned types are compared }
         unsigned : boolean;

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

         mmxbase : tmmxtype;

      begin
         if (p^.left^.resulttype^.deftype=stringdef) then
           begin
              secondaddstring(p);
              exit;
           end;
         unsigned:=false;
         is_in_dest:=false;
         extra_not:=false;

         opsize:=S_L;

         { calculate the operator which is more difficult }
         firstcomplex(p);
         { handling boolean expressions extra: }
         if ((p^.left^.resulttype^.deftype=orddef) and
            (porddef(p^.left^.resulttype)^.typ=bool8bit)) or
            ((p^.right^.resulttype^.deftype=orddef) and
            (porddef(p^.right^.resulttype)^.typ=bool8bit)) then
           begin
              if (p^.treetype=andn) or (p^.treetype=orn) then
                begin
                   p^.location.loc:=LOC_JUMP;
                   cmpop:=false;
                   case p^.treetype of
                     andn : begin
                               otl:=truelabel;
                               getlabel(truelabel);
                               secondpass(p^.left);
                               maketojumpbool(p^.left);
                               emitl(A_LABEL,truelabel);
                               truelabel:=otl;
                            end;
                     orn : begin
                              ofl:=falselabel;
                              getlabel(falselabel);
                              secondpass(p^.left);
                              maketojumpbool(p^.left);
                              emitl(A_LABEL,falselabel);
                              falselabel:=ofl;
                           end;
                     else Message(sym_e_type_mismatch);
                   end;
                  secondpass(p^.right);
                  maketojumpbool(p^.right);
                end
              else if p^.treetype in [unequaln,equaln,xorn] then
                begin
                   opsize:=S_B;
                   if p^.left^.treetype=ordconstn then
                     begin
                        swapp:=p^.right;
                        p^.right:=p^.left;
                        p^.left:=swapp;
                        p^.swaped:=not(p^.swaped);
                     end;
                   secondpass(p^.left);
                   p^.location:=p^.left^.location;
                   { are enough registers free ? }
                   pushed:=maybe_push(p^.right^.registers32,p);
                   secondpass(p^.right);
                   if pushed then restore(p);
                   goto do_normal;
                end
              else Message(sym_e_type_mismatch);
           end
         else
         if (p^.left^.resulttype^.deftype=setdef) and
            not(psetdef(p^.left^.resulttype)^.settype=smallset) then
           begin
              mboverflow:=false;
              secondpass(p^.left);
              set_location(p^.location,p^.left^.location);
              { are too few registers free? }
              pushed:=maybe_push(p^.right^.registers32,p);
              secondpass(p^.right);
              if pushed then restore(p);
              { not commutative }
              if p^.swaped then
                begin
                   swapp:=p^.left;
                   p^.left:=p^.right;
                   p^.right:=swapp;
                   { because of jump being produced by comparison }
                   p^.swaped:=not(p^.swaped);
                end;
              case p^.treetype of
                equaln,unequaln:
                  begin
                     cmpop:=true;
                     del_reference(p^.left^.location.reference);
                     del_reference(p^.right^.location.reference);
                     pushusedregisters(pushedregs,$ff);
                     emitpushreferenceaddr(p^.right^.location.reference);
                     emitpushreferenceaddr(p^.left^.location.reference);
                     emitcall('SET_COMP_SETS',true);
                     maybe_loadesi;
                     popusedregisters(pushedregs);
                     ungetiftemp(p^.left^.location.reference);
                     ungetiftemp(p^.right^.location.reference);
                  end;
                addn,symdifn,subn,muln:
                  begin
                     cmpop:=false;
                     del_reference(p^.left^.location.reference);
                     del_reference(p^.right^.location.reference);
                     href.symbol:=nil;
                     pushusedregisters(pushedregs,$ff);
                     gettempofsizereference(32,href);
                     emitpushreferenceaddr(href);
                     { wrong place !! was hard to find out
                     pushusedregisters(pushedregs,$ff);}
                     emitpushreferenceaddr(p^.right^.location.reference);
                     emitpushreferenceaddr(p^.left^.location.reference);
                     case p^.treetype of
                       subn:
                         emitcall('SET_SUB_SETS',true);
                       addn:
                         emitcall('SET_ADD_SETS',true);
                       symdifn:
                         emitcall('SET_SYMDIF_SETS',true);
                       muln:
                         emitcall('SET_MUL_SETS',true);
                     end;
                     maybe_loadesi;
                     popusedregisters(pushedregs);
                     ungetiftemp(p^.left^.location.reference);
                     ungetiftemp(p^.right^.location.reference);
                     p^.location.loc:=LOC_MEM;
                     stringdispose(p^.location.reference.symbol);
                     p^.location.reference:=href;
                  end;
                else Message(sym_e_type_mismatch);
              end;
           end
         else
           begin
              { in case of constant put it to the left }
              if p^.left^.treetype=ordconstn then
                begin
                   swapp:=p^.right;
                   p^.right:=p^.left;
                   p^.left:=swapp;
                   p^.swaped:=not(p^.swaped);
                end;
              secondpass(p^.left);
              { this will be complicated as
               a lot of code below assumes that
               p^.location and p^.left^.location are the same }

{$ifdef test_dest_loc}
              if dest_loc_known and (dest_loc_tree=p) and
                 ((dest_loc.loc=LOC_REGISTER) or (dest_loc.loc=LOC_CREGISTER)) then
                begin
                   set_location(p^.location,dest_loc);
                   in_dest_loc:=true;
                   is_in_dest:=true;
                end
              else
{$endif test_dest_loc}
                set_location(p^.location,p^.left^.location);
              { are too few registers free? }
              pushed:=maybe_push(p^.right^.registers32,p);
              secondpass(p^.right);
              if pushed then restore(p);
              if (p^.left^.resulttype^.deftype=pointerdef) or

                 (p^.right^.resulttype^.deftype=pointerdef) or

                 ((p^.right^.resulttype^.deftype=objectdef) and
                  pobjectdef(p^.right^.resulttype)^.isclass and
                 (p^.left^.resulttype^.deftype=objectdef) and
                  pobjectdef(p^.left^.resulttype)^.isclass
                 ) or

                 (p^.left^.resulttype^.deftype=classrefdef) or

                 (p^.left^.resulttype^.deftype=procvardef) or

                 (p^.left^.resulttype^.deftype=enumdef) or

                 ((p^.left^.resulttype^.deftype=orddef) and
                 (porddef(p^.left^.resulttype)^.typ=s32bit)) or
                 ((p^.right^.resulttype^.deftype=orddef) and
                 (porddef(p^.right^.resulttype)^.typ=s32bit)) or

                ((p^.left^.resulttype^.deftype=orddef) and
                 (porddef(p^.left^.resulttype)^.typ=u32bit)) or
                 ((p^.right^.resulttype^.deftype=orddef) and
                 (porddef(p^.right^.resulttype)^.typ=u32bit)) or

                { as well as small sets }
                ((p^.left^.resulttype^.deftype=setdef) and
                 (psetdef(p^.left^.resulttype)^.settype=smallset)
                ) then
                begin
           do_normal:
                   mboverflow:=false;
                   cmpop:=false;
                   if (p^.left^.resulttype^.deftype=pointerdef) or
                      (p^.right^.resulttype^.deftype=pointerdef) or
                      ((p^.left^.resulttype^.deftype=orddef) and
                      (porddef(p^.left^.resulttype)^.typ=u32bit)) or
                      ((p^.right^.resulttype^.deftype=orddef) and
                      (porddef(p^.right^.resulttype)^.typ=u32bit)) then
                     unsigned:=true;
                   is_set:=p^.resulttype^.deftype=setdef;

                   case p^.treetype of
                      addn : begin
                                if is_set then
                                  begin
                                     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
                                  begin
                                     Message(sym_e_type_mismatch);
                                  end;
                             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;
                                     extra_not:=true;
                                  end
                                else
                                  begin
                                     op:=A_SUB;
                                     mboverflow:=true;
                                  end;
                             end;
                      ltn,lten,gtn,gten,
                      equaln,unequaln :
                             begin
                                op:=A_CMP;
                                cmpop:=true;
                             end;
                      xorn : op:=A_XOR;
                      orn : op:=A_OR;
                      andn : op:=A_AND;
                      else Message(sym_e_type_mismatch);
                   end;
                   { left and right no register?  }
                   { then one must be demanded    }
                   if (p^.left^.location.loc<>LOC_REGISTER) and
                     (p^.right^.location.loc<>LOC_REGISTER) then
                     begin
                        { register variable ? }
                        if (p^.left^.location.loc=LOC_CREGISTER) then
                          begin
                             { it is OK if this is the destination }
                             if is_in_dest then
                               begin
                                  hregister:=p^.location.register;
                                  emit_reg_reg(A_MOV,opsize,p^.left^.location.register,
                                    hregister);
                               end
                             else
                             if cmpop then
                               begin
                                  { do not disturb the register }
                                  hregister:=p^.location.register;
                               end
                             else
                               begin
                                  case opsize of
                                     S_L : hregister:=getregister32;
                                     S_B : hregister:=reg32toreg8(getregister32);
                                  end;
                                  emit_reg_reg(A_MOV,opsize,p^.left^.location.register,
                                    hregister);
                               end

                          end
                        else
                          begin
                             del_reference(p^.left^.location.reference);

                             if is_in_dest then
                               begin
                                  hregister:=p^.location.register;
                                  exprasmlist^.concat(new(pai386,op_ref_reg(A_MOV,opsize,
                                  newreference(p^.left^.location.reference),hregister)));
                               end
                             else
                               begin
                                  { first give free, then demand new register }
                                  case opsize of
                                     S_L : hregister:=getregister32;
                                     S_B : hregister:=reg32toreg8(getregister32);
                                  end;
                                  exprasmlist^.concat(new(pai386,op_ref_reg(A_MOV,opsize,
                                    newreference(p^.left^.location.reference),hregister)));
                               end;
                          end;

                        p^.location.loc:=LOC_REGISTER;
                        p^.location.register:=hregister;

                     end
                   else
                     { if on the right the register then swap }
                     if (p^.right^.location.loc=LOC_REGISTER) then
                       begin
                          swap_location(p^.location,p^.right^.location);

                          { newly swapped also set swapped flag }
                          p^.swaped:=not(p^.swaped);
                       end;
                   { at this point, p^.location.loc should be LOC_REGISTER }
                   { and p^.location.register should be a valid register   }
                   { containing the left result                            }
                   if p^.right^.location.loc<>LOC_REGISTER then
                     begin
                        if (p^.treetype=subn) and p^.swaped then
                          begin
                             if p^.right^.location.loc=LOC_CREGISTER then
                               begin
                                  if extra_not then
                                    exprasmlist^.concat(new(pai386,op_reg(A_NOT,opsize,p^.location.register)));

                                  emit_reg_reg(A_MOV,opsize,p^.right^.location.register,R_EDI);
                                  emit_reg_reg(op,opsize,p^.location.register,R_EDI);
                                  emit_reg_reg(A_MOV,opsize,R_EDI,p^.location.register);
                               end
                             else
                               begin
                                  if extra_not then
                                    exprasmlist^.concat(new(pai386,op_reg(A_NOT,opsize,p^.location.register)));

                                  exprasmlist^.concat(new(pai386,op_ref_reg(A_MOV,opsize,
                                    newreference(p^.right^.location.reference),R_EDI)));
                                  exprasmlist^.concat(new(pai386,op_reg_reg(op,opsize,p^.location.register,R_EDI)));
                                  exprasmlist^.concat(new(pai386,op_reg_reg(A_MOV,opsize,R_EDI,p^.location.register)));
                                  del_reference(p^.right^.location.reference);
                               end;
                          end
                        else
                          begin
                             if (p^.right^.treetype=ordconstn) and
                                (op=A_CMP) and
                                (p^.right^.value=0) then
                               begin
                                  exprasmlist^.concat(new(pai386,op_reg_reg(A_TEST,opsize,p^.location.register,
                                    p^.location.register)));
                               end
                             else if (p^.right^.treetype=ordconstn) and
                                (op=A_ADD) and
                                (p^.right^.value=1) then
                               begin
                                  exprasmlist^.concat(new(pai386,op_reg(A_INC,opsize,
                                    p^.location.register)));
                               end
                             else if (p^.right^.treetype=ordconstn) and
                                (op=A_SUB) and
                                (p^.right^.value=1) then
                               begin
                                  exprasmlist^.concat(new(pai386,op_reg(A_DEC,opsize,
                                    p^.location.register)));
                               end
                             else if (p^.right^.treetype=ordconstn) and
                                (op=A_IMUL) and
                                (ispowerof2(p^.right^.value,power)) then
                               begin
                                  exprasmlist^.concat(new(pai386,op_const_reg(A_SHL,opsize,power,
                                    p^.location.register)));
                               end
                             else
                               begin
                                  if (p^.right^.location.loc=LOC_CREGISTER) then
                                    begin
                                       if extra_not then
                                         begin
                                            emit_reg_reg(A_MOV,S_L,p^.right^.location.register,R_EDI);
                                            exprasmlist^.concat(new(pai386,op_reg(A_NOT,S_L,R_EDI)));
                                            emit_reg_reg(A_AND,S_L,R_EDI,
                                              p^.location.register);
                                         end
                                       else
                                         begin
                                            emit_reg_reg(op,opsize,p^.right^.location.register,
                                              p^.location.register);
                                         end;
                                    end
                                  else
                                    begin
                                       if extra_not then
                                         begin
                                            exprasmlist^.concat(new(pai386,op_ref_reg(A_MOV,S_L,newreference(
                                              p^.right^.location.reference),R_EDI)));
                                            exprasmlist^.concat(new(pai386,op_reg(A_NOT,S_L,R_EDI)));
                                            emit_reg_reg(A_AND,S_L,R_EDI,
                                              p^.location.register);
                                         end
                                       else
                                         begin
                                            exprasmlist^.concat(new(pai386,op_ref_reg(op,opsize,newreference(
                                              p^.right^.location.reference),p^.location.register)));
                                         end;
                                       del_reference(p^.right^.location.reference);
                                    end;
                               end;
                          end;
                     end
                   else
                     begin
                        { when swapped another result register }
                        if (p^.treetype=subn) and p^.swaped then
                          begin
                             if extra_not then
                               exprasmlist^.concat(new(pai386,op_reg(A_NOT,S_L,p^.location.register)));

                             exprasmlist^.concat(new(pai386,op_reg_reg(op,opsize,
                               p^.location.register,p^.right^.location.register)));
                               swap_location(p^.location,p^.right^.location);
                               { newly swapped also set swapped flag }
                               { just to maintain ordering           }
                               p^.swaped:=not(p^.swaped);
                          end
                        else
                          begin
                             if extra_not then
                               exprasmlist^.concat(new(pai386,op_reg(A_NOT,S_L,p^.right^.location.register)));
                             exprasmlist^.concat(new(pai386,op_reg_reg(op,opsize,
                               p^.right^.location.register,
                               p^.location.register)));
                          end;
                        case opsize of
                           S_L : ungetregister32(p^.right^.location.register);
                           S_B : ungetregister32(reg8toreg32(p^.right^.location.register));
                        end;
                     end;

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

                   { only in case of overflow operations }
                   { produce overflow code }
                   if mboverflow then
                   { we must put it here directly, because sign of operation }
                   { is in unsigned VAR!!                                    }
                   begin
                     if cs_check_overflow in aktswitches  then
                     begin
                       getlabel(hl4);
                       if unsigned then
                        emitl(A_JNB,hl4)
                       else
                        emitl(A_JNO,hl4);
                       emitcall('RE_OVERFLOW',true);
                       emitl(A_LABEL,hl4);
                     end;
                   end;
                end
              else if ((p^.left^.resulttype^.deftype=orddef) and
                 (porddef(p^.left^.resulttype)^.typ=uchar)) then
                begin
                   case p^.treetype of
                      ltn,lten,gtn,gten,
                      equaln,unequaln :
                                cmpop:=true;
                      else Message(sym_e_type_mismatch);
                   end;
                   unsigned:=true;
                   { left and right no register? }
                   { the one must be demanded    }
                   if (p^.location.loc<>LOC_REGISTER) and
                     (p^.right^.location.loc<>LOC_REGISTER) then
                     begin
                        if p^.location.loc=LOC_CREGISTER then
                          begin
                             if cmpop then
                               { do not disturb register }
                               hregister:=p^.location.register
                             else
                               begin
                                  hregister:=reg32toreg8(getregister32);
                                  emit_reg_reg(A_MOV,S_B,p^.location.register,
                                    hregister);
                               end;
                          end
                        else
                          begin
                             del_reference(p^.location.reference);

                             { first give free then demand new register }
                             hregister:=reg32toreg8(getregister32);
                             exprasmlist^.concat(new(pai386,op_ref_reg(A_MOV,S_B,newreference(p^.location.reference),
                               hregister)));
                          end;
                        p^.location.loc:=LOC_REGISTER;
                        p^.location.register:=hregister;
                     end;

                   { now p always a register }

                   if (p^.right^.location.loc=LOC_REGISTER) and
                      (p^.location.loc<>LOC_REGISTER) then
                     begin
                       swap_location(p^.location,p^.right^.location);

                        { newly swapped also set swapped flag }
                        p^.swaped:=not(p^.swaped);
                     end;
                   if p^.right^.location.loc<>LOC_REGISTER then
                     begin
                        if p^.right^.location.loc=LOC_CREGISTER then
                          begin
                             emit_reg_reg(A_CMP,S_B,
                                p^.right^.location.register,p^.location.register);
                          end
                        else
                          begin
                             exprasmlist^.concat(new(pai386,op_ref_reg(A_CMP,S_B,newreference(
                                p^.right^.location.reference),p^.location.register)));
                             del_reference(p^.right^.location.reference);
                          end;
                     end
                   else
                     begin
                        emit_reg_reg(A_CMP,S_B,p^.right^.location.register,
                          p^.location.register);
                        ungetregister32(reg8toreg32(p^.right^.location.register));
                     end;
                   ungetregister32(reg8toreg32(p^.location.register));
                end
              else if (p^.left^.resulttype^.deftype=floatdef) and
                  (pfloatdef(p^.left^.resulttype)^.typ<>f32bit) then
                 begin
                    { real constants to the left }
                    if p^.left^.treetype=realconstn then
                      begin
                         swapp:=p^.right;
                         p^.right:=p^.left;
                         p^.left:=swapp;
                         p^.swaped:=not(p^.swaped);
                      end;
                    cmpop:=false;
                    case p^.treetype 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 Message(sym_e_type_mismatch);
                    end;

                    if (p^.right^.location.loc<>LOC_FPU) then
                      begin
                         floatload(pfloatdef(p^.right^.resulttype)^.typ,p^.right^.location.reference);
                         if (p^.left^.location.loc<>LOC_FPU) then
                           floatload(pfloatdef(p^.left^.resulttype)^.typ,p^.left^.location.reference)
                         { left was on the stack => swap }
                         else
                           p^.swaped:=not(p^.swaped);

                         { releases the right reference }
                         del_reference(p^.right^.location.reference);
                      end
                    { the nominator in st0 }
                    else if (p^.left^.location.loc<>LOC_FPU) then
                      floatload(pfloatdef(p^.left^.resulttype)^.typ,p^.left^.location.reference)
                    { fpu operands are always in the wrong order on the stack }
                    else
                      p^.swaped:=not(p^.swaped);

                    { releases the left reference }
                    if (p^.left^.location.loc<>LOC_FPU) then
                      del_reference(p^.left^.location.reference);

                    { if we swaped the tree nodes, then use the reverse operator }
                    if p^.swaped then
                      begin
                         if (p^.treetype=slashn) then
                           op:=A_FDIVRP
                         else if (p^.treetype=subn) then
                           op:=A_FSUBRP;
                      end;
                    { to avoid the pentium bug
                    if (op=FDIVP) and (opt_processors=pentium) then
                      exprasmlist^.concat(new(pai386,op_CALL,S_NO,'EMUL_FDIVP')
                    else
                    }
                    { the Intel assemblers want operands }
                    if op<>A_FCOMPP then
                       exprasmlist^.concat(new(pai386,op_reg_reg(op,S_NO,R_ST,R_ST1)))
                    else
                      exprasmlist^.concat(new(pai386,op_none(op,S_NO)));
                    { on comparison load flags }
                    if cmpop then
                      begin
                         if not(R_EAX in unused) then
                           emit_reg_reg(A_MOV,S_L,R_EAX,R_EDI);
                         exprasmlist^.concat(new(pai386,op_reg(A_FNSTSW,S_NO,R_AX)));
                         exprasmlist^.concat(new(pai386,op_none(A_SAHF,S_NO)));
                         if not(R_EAX in unused) then
                           emit_reg_reg(A_MOV,S_L,R_EDI,R_EAX);
                         if p^.swaped then
                           case p^.treetype of
                              equaln : flags:=F_E;
                              unequaln : flags:=F_NE;
                              ltn : flags:=F_A;
                              lten : flags:=F_AE;
                              gtn : flags:=F_B;
                              gten : flags:=F_BE;
                           end
                         else
                           case p^.treetype of
                              equaln : flags:=F_E;
                              unequaln : flags:=F_NE;
                              ltn : flags:=F_B;
                              lten : flags:=F_BE;
                              gtn : flags:=F_A;
                              gten : flags:=F_AE;
                           end;
                         p^.location.loc:=LOC_FLAGS;
                         p^.location.resflags:=flags;
                         cmpop:=false;
                      end
                    else
                      p^.location.loc:=LOC_FPU;
                 end
{$ifdef SUPPORT_MMX}
               else if is_mmx_able_array(p^.left^.resulttype) then
                 begin
                   cmpop:=false;
                   mmxbase:=mmx_type(p^.left^.resulttype);
                   case p^.treetype of
                      addn : begin
                                if (cs_mmx_saturation in aktswitches^) 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 aktswitches^) 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 Message(sym_e_type_mismatch);
                   end;
                   { left and right no register?  }
                   { then one must be demanded    }
                   if (p^.left^.location.loc<>LOC_MMXREGISTER) and
                     (p^.right^.location.loc<>LOC_MMXREGISTER) then
                     begin
                        { register variable ? }
                        if (p^.left^.location.loc=LOC_CMMXREGISTER) then
                          begin
                             { it is OK if this is the destination }
                             if is_in_dest then
                               begin
                                  hregister:=p^.location.register;
                                  emit_reg_reg(A_MOVQ,S_NO,p^.left^.location.register,
                                    hregister);
                               end
                             else
                               begin
                                  hregister:=getregistermmx;
                                  emit_reg_reg(A_MOVQ,S_NO,p^.left^.location.register,
                                    hregister);
                               end

                          end
                        else
                          begin
                             del_reference(p^.left^.location.reference);

                             if is_in_dest then
                               begin
                                  hregister:=p^.location.register;
                                  exprasmlist^.concat(new(pai386,op_ref_reg(A_MOVQ,S_NO,
                                  newreference(p^.left^.location.reference),hregister)));
                               end
                             else
                               begin
                                  hregister:=getregistermmx;
                                  exprasmlist^.concat(new(pai386,op_ref_reg(A_MOVQ,S_NO,
                                    newreference(p^.left^.location.reference),hregister)));
                               end;
                          end;

                        p^.location.loc:=LOC_MMXREGISTER;
                        p^.location.register:=hregister;

                     end
                   else
                     { if on the right the register then swap }
                     if (p^.right^.location.loc=LOC_MMXREGISTER) then
                       begin
                          swap_location(p^.location,p^.right^.location);

                          { newly swapped also set swapped flag }
                          p^.swaped:=not(p^.swaped);
                       end;
                   { at this point, p^.location.loc should be LOC_MMXREGISTER }
                   { and p^.location.register should be a valid register      }
                   { containing the left result                               }
                   if p^.right^.location.loc<>LOC_MMXREGISTER then
                     begin
                        if (p^.treetype=subn) and p^.swaped then
                          begin
                             if p^.right^.location.loc=LOC_CMMXREGISTER then
                               begin
                                  emit_reg_reg(A_MOVQ,S_NO,p^.right^.location.register,R_MM7);
                                  emit_reg_reg(op,S_NO,p^.location.register,R_EDI);
                                  emit_reg_reg(A_MOVQ,S_NO,R_MM7,p^.location.register);
                               end
                             else
                               begin

                                  exprasmlist^.concat(new(pai386,op_ref_reg(A_MOVQ,S_NO,
                                    newreference(p^.right^.location.reference),R_MM7)));
                                  exprasmlist^.concat(new(pai386,op_reg_reg(op,S_NO,p^.location.register,
                                    R_MM7)));
                                  exprasmlist^.concat(new(pai386,op_reg_reg(A_MOVQ,S_NO,
                                    R_MM7,p^.location.register)));
                                  del_reference(p^.right^.location.reference);
                               end;
                          end
                        else
                          begin
                             if (p^.right^.location.loc=LOC_CREGISTER) then
                               begin
                                  emit_reg_reg(op,S_NO,p^.right^.location.register,
                                    p^.location.register);
                               end
                             else
                               begin
                                  exprasmlist^.concat(new(pai386,op_ref_reg(op,S_NO,newreference(
                                    p^.right^.location.reference),p^.location.register)));
                                  del_reference(p^.right^.location.reference);
                               end;
                          end;
                     end
                   else
                     begin
                        { when swapped another result register }
                        if (p^.treetype=subn) and p^.swaped then
                          begin
                             exprasmlist^.concat(new(pai386,op_reg_reg(op,S_NO,
                               p^.location.register,p^.right^.location.register)));
                               swap_location(p^.location,p^.right^.location);
                               { newly swapped also set swapped flag }
                               { just to maintain ordering           }
                               p^.swaped:=not(p^.swaped);
                          end
                        else
                          begin
                             exprasmlist^.concat(new(pai386,op_reg_reg(op,S_NO,
                               p^.right^.location.register,
                               p^.location.register)));
                          end;
                        ungetregistermmx(p^.right^.location.register);
                     end;
                end
{$endif SUPPORT_MMX}
              else Message(sym_e_type_mismatch);
           end;
       setaddresult(cmpop,unsigned,p);
    end;

{
     $Log$
     Revision 1.3  1998-04-08 11:34:22  peter
       * nasm works (linux only tested)

     Revision 1.2  1998/03/28 23:09:55  florian
       * secondin bugfix (m68k and i386)
       * overflow checking bugfix (m68k and i386) -- pretty useless in
         secondadd, since everything is done using 32-bit
       * loading pointer to routines hopefully fixed (m68k)
       * flags problem with calls to RTL internal routines fixed (still strcmp
         to fix) (m68k)
       * #ELSE was still incorrect (didn't take care of the previous level)
       * problem with filenames in the command line solved
       * problem with mangledname solved
       * linking name problem solved (was case insensitive)
       * double id problem and potential crash solved
       * stop after first error
       * and=>test problem removed
       * correct read for all float types
       * 2 sigsegv fixes and a cosmetic fix for Internal Error
       * push/pop is now correct optimized (=> mov (%esp),reg)

     Revision 1.1.1.1  1998/03/25 11:18:12  root
     * Restored version

     Revision 1.15  1998/03/10 23:48:36  florian
       * a couple of bug fixes to get the compiler with -OGaxz compiler, sadly
         enough, it doesn't run

     Revision 1.14  1998/03/10 01:17:18  peter
       * all files have the same header
       * messages are fully implemented, EXTDEBUG uses Comment()
       + AG... files for the Assembler generation

     Revision 1.13  1998/03/09 10:44:38  peter
       + string='', string<>'', string:='', string:=char optimizes (the first 2
         were already in cg68k2)

     Revision 1.12  1998/03/06 00:52:16  peter
       * replaced all old messages from errore.msg, only ExtDebug and some
         Comment() calls are left
       * fixed options.pas

     Revision 1.11  1998/03/02 01:48:30  peter
       * renamed target_DOS to target_GO32V1
       + new verbose system, merged old errors and verbose units into one new
         verbose.pas, so errors.pas is obsolete

     Revision 1.10  1998/02/15 21:27:50  florian
     *** empty log message ***
}