fpc/compiler/ncginl.pas

{
    $Id$
    Copyright (c) 1998-2002 by Florian Klaempfl and Carl Eric Codere

    Generate generic inline nodes

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

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

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

 ****************************************************************************
}
unit ncginl;

{$i fpcdefs.inc}

interface

    uses
       node,ninl;

    type
       tcginlinenode = class(tinlinenode)
          procedure pass_2;override;
          procedure second_assert;virtual;
          procedure second_sizeoftypeof;virtual;
          procedure second_length;virtual;
          procedure second_predsucc;virtual;
          procedure second_incdec;virtual;
          procedure second_typeinfo;virtual;
          procedure second_includeexclude;virtual;
          procedure second_pi; virtual;
          procedure second_arctan_real; virtual;
          procedure second_abs_real; virtual;
          procedure second_sqr_real; virtual;
          procedure second_sqrt_real; virtual;
          procedure second_ln_real; virtual;
          procedure second_cos_real; virtual;
          procedure second_sin_real; virtual;
       end;

implementation

    uses
      globtype,systems,
      cutils,verbose,globals,fmodule,
      symconst,symdef,defutil,symsym,
      aasmbase,aasmtai,aasmcpu,
      cginfo,cgbase,pass_1,pass_2,
      cpuinfo,cpubase,paramgr,
      nbas,ncon,ncal,ncnv,nld,
      tgobj,ncgutil,cgobj,rgobj
{$ifndef cpu64bit}
      ,cg64f32
{$endif cpu64bit}
      ;


{*****************************************************************************
                              TCGINLINENODE
*****************************************************************************}


    procedure tcginlinenode.pass_2;
       var
         oldpushedparasize : longint;
      begin
         location_reset(location,LOC_VOID,OS_NO);

         { save & reset pushedparasize }
         oldpushedparasize:=pushedparasize;
         pushedparasize:=0;
         case inlinenumber of
            in_assert_x_y:
              begin
                 second_Assert;
              end;
            in_sizeof_x,
            in_typeof_x :
              begin
                 second_SizeofTypeOf;
              end;
            in_length_x :
              begin
                 second_Length;
              end;
            in_pred_x,
            in_succ_x:
              begin
                 second_PredSucc;
              end;
            in_dec_x,
            in_inc_x :
              begin
                second_IncDec;
              end;
            in_typeinfo_x:
               begin
                  second_TypeInfo;
               end;
            in_include_x_y,
            in_exclude_x_y:
              begin
                 second_IncludeExclude;
              end;
            in_pi:
              begin
                second_pi;
              end;
            in_sin_extended:
              begin
                second_sin_real;
              end;
            in_arctan_extended:
              begin
                second_arctan_real;
              end;
            in_abs_extended:
              begin
                second_abs_real;
              end;
            in_sqr_extended:
              begin
                second_sqr_real;
              end;
            in_sqrt_extended:
              begin
                second_sqrt_real;
              end;
            in_ln_extended:
              begin
                second_ln_real;
              end;
            in_cos_extended:
              begin
                 second_cos_real;
              end;
{$ifdef SUPPORT_MMX}
            in_mmx_pcmpeqb..in_mmx_pcmpgtw:
              begin
                 location_reset(location,LOC_MMXREGISTER,OS_NO);
                 if left.location.loc=LOC_REGISTER then
                   begin
                      {!!!!!!!}
                   end
                 else if tcallparanode(left).left.location.loc=LOC_REGISTER then
                   begin
                      {!!!!!!!}
                   end
                 else
                   begin
                      {!!!!!!!}
                   end;
              end;
{$endif SUPPORT_MMX}
            else internalerror(9);
         end;
         { reset pushedparasize }
         pushedparasize:=oldpushedparasize;
      end;


{*****************************************************************************
                          ASSERT GENERIC HANDLING
*****************************************************************************}
    procedure tcginlinenode.second_Assert;
     var
         hp2 : tstringconstnode;
         otlabel,oflabel{,l1}   : tasmlabel;
         r: Tregister;
     begin
       { the node should be removed in the firstpass }
       if not (cs_do_assertion in aktlocalswitches) then
          internalerror(7123458);
       otlabel:=truelabel;
       oflabel:=falselabel;
       objectlibrary.getlabel(truelabel);
       objectlibrary.getlabel(falselabel);
       secondpass(tcallparanode(left).left);
       maketojumpbool(exprasmlist,tcallparanode(left).left,lr_load_regvars);
       cg.a_label(exprasmlist,falselabel);
       { erroraddr }
       r.enum:=R_INTREGISTER;
       r.number:=NR_FRAME_POINTER_REG;
       cg.a_param_reg(exprasmlist,OS_ADDR,r,paramanager.getintparaloc(4));
       { lineno }
       cg.a_param_const(exprasmlist,OS_INT,aktfilepos.line,paramanager.getintparaloc(3));
       { filename string }
       hp2:=cstringconstnode.createstr(current_module.sourcefiles.get_file_name(aktfilepos.fileindex),st_shortstring);
       firstpass(tnode(hp2));
       secondpass(tnode(hp2));
       if codegenerror then
          exit;
       cg.a_paramaddr_ref(exprasmlist,hp2.location.reference,paramanager.getintparaloc(2));
       hp2.free;
       { push msg }
       secondpass(tcallparanode(tcallparanode(left).right).left);
       cg.a_paramaddr_ref(exprasmlist,tcallparanode(tcallparanode(left).right).left.location.reference,paramanager.getintparaloc(1));
       { call }
       cg.a_call_name(exprasmlist,'FPC_ASSERT');
       cg.a_label(exprasmlist,truelabel);
       truelabel:=otlabel;
       falselabel:=oflabel;
     end;


{*****************************************************************************
                          SIZEOF / TYPEOF GENERIC HANDLING
*****************************************************************************}

    { second_handle_ the sizeof and typeof routines }
    procedure tcginlinenode.second_SizeOfTypeOf;
      var
         href,
         hrefvmt   : treference;
         hregister : tregister;
      begin
        location_reset(location,LOC_REGISTER,OS_ADDR);
        { for both cases load vmt }
        if left.nodetype=typen then
          begin
            hregister:=rg.getaddressregister(exprasmlist);
            reference_reset_symbol(href,objectlibrary.newasmsymboldata(tobjectdef(left.resulttype.def).vmt_mangledname),0);
            cg.a_loadaddr_ref_reg(exprasmlist,href,hregister);
          end
        else
          begin
            secondpass(left);
            location_release(exprasmlist,left.location);
            hregister:=rg.getaddressregister(exprasmlist);

            { handle self inside a method of a class }
            case left.location.loc of
              LOC_CREGISTER,
              LOC_REGISTER :
                begin
                  if (left.resulttype.def.deftype=classrefdef) or
                     (po_staticmethod in current_procdef.procoptions) then
                    cg.a_load_reg_reg(exprasmlist,OS_ADDR,OS_ADDR,left.location.register,hregister)
                  else
                   begin
                     { load VMT pointer }
                     reference_reset_base(hrefvmt,left.location.register,tobjectdef(left.resulttype.def).vmt_offset);
                     cg.a_load_ref_reg(exprasmlist,OS_ADDR,OS_ADDR,hrefvmt,hregister);
                   end
                end;
              LOC_REFERENCE,
              LOC_CREFERENCE :
                begin
                  if is_class(left.resulttype.def) then
                   begin
                     { deref class }
                     cg.a_load_ref_reg(exprasmlist,OS_ADDR,OS_ADDR,left.location.reference,hregister);
                     cg.g_maybe_testself(exprasmlist,hregister);
                     { load VMT pointer }
                     reference_reset_base(hrefvmt,hregister,tobjectdef(left.resulttype.def).vmt_offset);
                     cg.a_load_ref_reg(exprasmlist,OS_ADDR,OS_ADDR,hrefvmt,hregister);
                   end
                  else
                   begin
                     { load VMT pointer, but not for classrefdefs }
                     if (left.resulttype.def.deftype=objectdef) then
                       inc(left.location.reference.offset,tobjectdef(left.resulttype.def).vmt_offset);
                     cg.a_load_ref_reg(exprasmlist,OS_ADDR,OS_ADDR,left.location.reference,hregister);
                   end;
                end;
              else
                internalerror(200301301);
            end;
          end;
        { in sizeof load size }
        if inlinenumber=in_sizeof_x then
           begin
             reference_reset_base(href,hregister,0);
             rg.ungetaddressregister(exprasmlist,hregister);
             hregister:=rg.getregisterint(exprasmlist,OS_INT);
             cg.a_load_ref_reg(exprasmlist,OS_INT,OS_INT,href,hregister);
           end;
        location.register:=hregister;
     end;



{*****************************************************************************
                          LENGTH GENERIC HANDLING
*****************************************************************************}

    procedure tcginlinenode.second_Length;
      var
        lengthlab : tasmlabel;
        hregister : tregister;
        href : treference;
      begin
        secondpass(left);
        if is_shortstring(left.resulttype.def) then
         begin
           location_copy(location,left.location);
           location.size:=OS_8;
         end
        else
         begin
           { length in ansi strings is at offset -8 }
           location_force_reg(exprasmlist,left.location,OS_ADDR,false);
           hregister:=left.location.register;
           objectlibrary.getlabel(lengthlab);
           cg.a_cmp_const_reg_label(exprasmlist,OS_ADDR,OC_EQ,0,hregister,lengthlab);
           reference_reset_base(href,hregister,-8);
           cg.a_load_ref_reg(exprasmlist,OS_32,OS_32,href,hregister);
           cg.a_label(exprasmlist,lengthlab);
           location_reset(location,LOC_REGISTER,OS_32);
           location.register:=hregister;
         end;
      end;


{*****************************************************************************
                         PRED/SUCC GENERIC HANDLING
*****************************************************************************}

    procedure tcginlinenode.second_PredSucc;
      var
         cgsize : TCGSize;
         cgop : topcg;
      begin
        secondpass(left);
        if inlinenumber=in_pred_x then
           cgop:=OP_SUB
        else
           cgop:=OP_ADD;
        cgsize:=def_cgsize(resulttype.def);

        { we need a value in a register }
        location_copy(location,left.location);
        location_force_reg(exprasmlist,location,cgsize,false);

        if cgsize in [OS_64,OS_S64] then
          cg64.a_op64_const_reg(exprasmlist,cgop,1,
                      location.register64)
        else
          cg.a_op_const_reg(exprasmlist,cgop,location.size,1,location.register);

        cg.g_rangecheck(exprasmlist,location,resulttype.def,resulttype.def);
      end;


{*****************************************************************************
                         INC/DEC GENERIC HANDLING
*****************************************************************************}
      procedure tcginlinenode.second_IncDec;
       const
         addsubop:array[in_inc_x..in_dec_x] of TOpCG=(OP_ADD,OP_SUB);
        var
         addvalue : longint;
         addconstant : boolean;
         hregisterhi,
         hregister : tregister;
         cgsize : tcgsize;
         pushedregs : tmaybesave;
        begin
          { set defaults }
          addconstant:=true;
          { load first parameter, must be a reference }
          secondpass(tcallparanode(left).left);
          cgsize:=def_cgsize(tcallparanode(left).left.resulttype.def);
          { get addvalue }
          case tcallparanode(left).left.resulttype.def.deftype of
            orddef,
            enumdef :
                addvalue:=1;
            pointerdef :
               begin
                 if is_void(tpointerdef(tcallparanode(left).left.resulttype.def).pointertype.def) then
                   addvalue:=1
                 else
                   addvalue:=tpointerdef(tcallparanode(left).left.resulttype.def).pointertype.def.size;
               end;
           else
               internalerror(10081);
          end;
          { second_ argument specified?, must be a s32bit in register }
          if assigned(tcallparanode(left).right) then
            begin
            {$ifndef newra}
              maybe_save(exprasmlist,tcallparanode(tcallparanode(left).right).left.registers32,
                 tcallparanode(left).left.location,pushedregs);
            {$endif}
              secondpass(tcallparanode(tcallparanode(left).right).left);
            {$ifndef newra}
              maybe_restore(exprasmlist,tcallparanode(left).left.location,pushedregs);
            {$endif}
              { when constant, just multiply the addvalue }
              if is_constintnode(tcallparanode(tcallparanode(left).right).left) then
                 addvalue:=addvalue*get_ordinal_value(tcallparanode(tcallparanode(left).right).left)
              else
                begin
                  location_force_reg(exprasmlist,tcallparanode(tcallparanode(left).right).left.location,cgsize,false);
                  hregister:=tcallparanode(tcallparanode(left).right).left.location.register;
                  hregisterhi:=tcallparanode(tcallparanode(left).right).left.location.registerhigh;
                  { insert multiply with addvalue if its >1 }
                  if addvalue>1 then
                    cg.a_op_const_reg(exprasmlist,OP_IMUL,cgsize,addvalue,hregister);
                  addconstant:=false;
                end;
            end;
          { write the add instruction }
          if addconstant then
            begin
              if cgsize in [OS_64,OS_S64] then
               cg64.a_op64_const_loc(exprasmlist,addsubop[inlinenumber],
                  addvalue,tcallparanode(left).left.location)
              else
               cg.a_op_const_loc(exprasmlist,addsubop[inlinenumber],
                  aword(addvalue),tcallparanode(left).left.location);
            end
           else
             begin
{$ifndef cpu64bit}
               if cgsize in [OS_64,OS_S64] then
                 cg64.a_op64_reg_loc(exprasmlist,addsubop[inlinenumber],
                   joinreg64(hregister,hregisterhi),tcallparanode(left).left.location)
               else
{$endif cpu64bit}
                 cg.a_op_reg_loc(exprasmlist,addsubop[inlinenumber],
                   hregister,tcallparanode(left).left.location);
               location_release(exprasmlist,tcallparanode(tcallparanode(left).right).left.location);
             end;
          location_release(exprasmlist,tcallparanode(left).left.location);
          cg.g_overflowcheck(exprasmlist,tcallparanode(left).left.location,tcallparanode(left).resulttype.def);
          cg.g_rangecheck(exprasmlist,tcallparanode(left).left.location,tcallparanode(left).left.resulttype.def,
              tcallparanode(left).left.resulttype.def);
        end;


{*****************************************************************************
                         TYPEINFO GENERIC HANDLING
*****************************************************************************}
      procedure tcginlinenode.second_typeinfo;
        var
         href : treference;
        begin
          location_reset(location,LOC_REGISTER,OS_ADDR);
          location.register:=rg.getaddressregister(exprasmlist);
          reference_reset_symbol(href,tstoreddef(ttypenode(tcallparanode(left).left).resulttype.def).get_rtti_label(fullrtti),0);
          cg.a_loadaddr_ref_reg(exprasmlist,href,location.register);
        end;


{*****************************************************************************
                     INCLUDE/EXCLUDE GENERIC HANDLING
*****************************************************************************}
      procedure tcginlinenode.second_IncludeExclude;
        var
         hregister : tregister;
         L : longint;
         pushedregs : TMaybesave;
         cgop : topcg;
         addrreg, hregister2: tregister;
         use_small : boolean;
         cgsize : tcgsize;
         href : treference;
        begin
          secondpass(tcallparanode(left).left);
          if tcallparanode(tcallparanode(left).right).left.nodetype=ordconstn then
            begin
              { calculate bit position }
              l:=1 shl (tordconstnode(tcallparanode(tcallparanode(left).right).left).value mod 32);

              { determine operator }
              if inlinenumber=in_include_x_y then
                cgop:=OP_OR
              else
                begin
                  cgop:=OP_AND;
                  l:=not(l);
                end;
              if (tcallparanode(left).left.location.loc=LOC_REFERENCE) then
                begin
                  inc(tcallparanode(left).left.location.reference.offset,
                    (tordconstnode(tcallparanode(tcallparanode(left).right).left).value div 32)*4);
                  cg.a_op_const_ref(exprasmlist,cgop,OS_INT,l,tcallparanode(left).left.location.reference);
                  location_release(exprasmlist,tcallparanode(left).left.location);
                end
              else
                { LOC_CREGISTER }
                begin
                  cg.a_op_const_reg(exprasmlist,cgop,tcallparanode(left).left.location.size,l,tcallparanode(left).left.location.register);
                end;
            end
          else
            begin
             use_small:=
                 { set type }
                 (tsetdef(tcallparanode(left).left.resulttype.def).settype=smallset)
                  and
                   { elemenut number between 1 and 32 }
                  ((tcallparanode(tcallparanode(left).right).left.resulttype.def.deftype=orddef) and
                   (torddef(tcallparanode(tcallparanode(left).right).left.resulttype.def).high<=32) or
                   (tcallparanode(tcallparanode(left).right).left.resulttype.def.deftype=enumdef) and
                   (tenumdef(tcallparanode(tcallparanode(left).right).left.resulttype.def).max<=32));

              { generate code for the element to set }
            {$ifndef newra}
              maybe_save(exprasmlist,tcallparanode(tcallparanode(left).right).left.registers32,
                        tcallparanode(left).left.location,pushedregs);
            {$endif newra}
              secondpass(tcallparanode(tcallparanode(left).right).left);
            {$ifndef newra}
              maybe_restore(exprasmlist,tcallparanode(left).left.location,pushedregs);
            {$endif newra}

              { bitnumber - which must be loaded into register }
            {$ifdef newra}
              hregister:=rg.getregisterint(exprasmlist,OS_INT);
            {$else}
              hregister := cg.get_scratch_reg_int(exprasmlist,OS_INT);
            {$endif}
              hregister2 := rg.getregisterint(exprasmlist,OS_INT);

              case tcallparanode(tcallparanode(left).right).left.location.loc of
                 LOC_CREGISTER,
                 LOC_REGISTER:
                   begin
                     cg.a_load_reg_reg(exprasmlist,OS_INT,OS_INT,
                       tcallparanode(tcallparanode(left).right).left.location.register,hregister);
                   end;
                 LOC_CREFERENCE,
                 LOC_REFERENCE:
                   begin
                     cgsize := def_cgsize(tcallparanode(tcallparanode(left).right).left.resulttype.def);
                     cg.a_load_ref_reg(exprasmlist,cgsize,cgsize,
                       tcallparanode(tcallparanode(left).right).left.location.reference,hregister);
                   end;
               else
                 internalerror(20020727);
               end;

              if use_small then
                begin
                  { hregister contains the bitnumber to add }
                   cg.a_load_const_reg(exprasmlist, OS_INT, 1, hregister2);
                   cg.a_op_reg_reg(exprasmlist, OP_SHL, OS_INT, hregister, hregister2);


                  { possiblities :
                       bitnumber : LOC_REFERENCE, LOC_REGISTER, LOC_CREGISTER
                       set value : LOC_REFERENCE, LOC_REGISTER
                  }
                  { location of set }
                  if (tcallparanode(left).left.location.loc=LOC_REFERENCE) then
                    begin
                     if inlinenumber=in_include_x_y then
                       begin
                         cg.a_op_reg_ref(exprasmlist, OP_OR, OS_32, hregister2,
                         tcallparanode(left).left.location.reference);
                       end
                     else
                       begin
                         cg.a_op_reg_reg(exprasmlist, OP_NOT, OS_32, hregister2,
                         hregister2);
                         cg.a_op_reg_ref(exprasmlist, OP_AND, OS_32, hregister2,
                         tcallparanode(left).left.location.reference);
                       end;

                    end
                  else
                    internalerror(20020728);
                end
              else
                begin
                  { possiblities :
                       bitnumber : LOC_REFERENCE, LOC_REGISTER, LOC_CREGISTER
                       set value : LOC_REFERENCE
                  }
                  { hregister contains the bitnumber (div 32 to get the correct offset) }
                  { hregister contains the bitnumber to add }

                  cg.a_op_const_reg_reg(exprasmlist, OP_SHR, OS_32, 5, hregister,hregister2);
                  cg.a_op_const_reg(exprasmlist, OP_SHL, OS_32, 2, hregister2);
              {$ifdef newra}
                  addrreg:=rg.getaddressregister(exprasmlist);
              {$else}
                  addrreg := cg.get_scratch_reg_address(exprasmlist);
              {$endif}
                  { calculate the correct address of the operand }
                  cg.a_loadaddr_ref_reg(exprasmlist, tcallparanode(left).left.location.reference,addrreg);
                  cg.a_op_reg_reg(exprasmlist, OP_ADD, OS_INT, hregister2, addrreg);

                  { hregister contains the bitnumber to add }
                  cg.a_load_const_reg(exprasmlist, OS_INT, 1, hregister2);
                  cg.a_op_const_reg(exprasmlist, OP_AND, OS_INT, 31, hregister);
                  cg.a_op_reg_reg(exprasmlist, OP_SHL, OS_INT, hregister, hregister2);


                  reference_reset_base(href,addrreg,0);

                  if inlinenumber=in_include_x_y then
                       begin
                         cg.a_op_reg_ref(exprasmlist, OP_OR, OS_32, hregister2, href);
                       end
                     else
                       begin
                         cg.a_op_reg_reg(exprasmlist, OP_NOT, OS_32, hregister2, hregister2);
                         cg.a_op_reg_ref(exprasmlist, OP_AND, OS_32, hregister2, href);
                       end;
                {$ifdef newra}
                  rg.ungetregisterint(exprasmlist,addrreg);
                {$else}
                  cg.free_scratch_reg(exprasmlist, addrreg);
                {$endif}
                end;
              {$ifdef newra}
                rg.ungetregisterint(exprasmlist,hregister);
              {$else}
                cg.free_scratch_reg(exprasmlist,hregister);
              {$endif}
                rg.ungetregisterint(exprasmlist,hregister2);
            end;
        end;

{*****************************************************************************
                            FLOAT GENERIC HANDLING
*****************************************************************************}

{
  These routines all call internal RTL routines, so if they are
  called here, they give an internal error
}
    procedure tcginlinenode.second_pi;
      begin
        internalerror(20020718);
      end;

    procedure tcginlinenode.second_arctan_real;
      begin
        internalerror(20020718);
      end;

    procedure tcginlinenode.second_abs_real;
      begin
        internalerror(20020718);
      end;


    procedure tcginlinenode.second_sqr_real;
      begin
        internalerror(20020718);
      end;

    procedure tcginlinenode.second_sqrt_real;
      begin
        internalerror(20020718);
      end;

    procedure tcginlinenode.second_ln_real;
      begin
        internalerror(20020718);
      end;

    procedure tcginlinenode.second_cos_real;
      begin
        internalerror(20020718);
      end;

    procedure tcginlinenode.second_sin_real;
      begin
        internalerror(20020718);
      end;

begin
   cinlinenode:=tcginlinenode;
end.

{
  $Log$
  Revision 1.35  2003-06-03 21:11:09  peter
    * cg.a_load_* get a from and to size specifier
    * makeregsize only accepts newregister
    * i386 uses generic tcgnotnode,tcgunaryminus

  Revision 1.34  2003/06/01 21:38:06  peter
    * getregisterfpu size parameter added
    * op_const_reg size parameter added
    * sparc updates

  Revision 1.33  2003/05/24 17:15:59  jonas
    - removed bogus location_copy for include/exclude

  Revision 1.32  2003/05/23 21:10:38  jonas
    * fixed exclude

  Revision 1.31  2003/05/23 14:27:35  peter
    * remove some unit dependencies
    * current_procinfo changes to store more info

  Revision 1.30  2003/05/09 17:47:02  peter
    * self moved to hidden parameter
    * removed hdisposen,hnewn,selfn

  Revision 1.29  2003/05/01 12:27:08  jonas
    * fixed include/exclude for normalsets

  Revision 1.28  2003/04/27 11:21:33  peter
    * aktprocdef renamed to current_procdef
    * procinfo renamed to current_procinfo
    * procinfo will now be stored in current_module so it can be
      cleaned up properly
    * gen_main_procsym changed to create_main_proc and release_main_proc
      to also generate a tprocinfo structure
    * fixed unit implicit initfinal

  Revision 1.27  2003/04/25 08:25:26  daniel
    * Ifdefs around a lot of calls to cleartempgen
    * Fixed registers that are allocated but not freed in several nodes
    * Tweak to register allocator to cause less spills
    * 8-bit registers now interfere with esi,edi and ebp
      Compiler can now compile rtl successfully when using new register
      allocator

  Revision 1.26  2003/04/24 22:29:57  florian
    * fixed a lot of PowerPC related stuff

  Revision 1.25  2003/04/22 23:50:22  peter
    * firstpass uses expectloc
    * checks if there are differences between the expectloc and
      location.loc from secondpass in EXTDEBUG

  Revision 1.24  2003/04/22 10:09:35  daniel
    + Implemented the actual register allocator
    + Scratch registers unavailable when new register allocator used
    + maybe_save/maybe_restore unavailable when new register allocator used

  Revision 1.23  2003/04/06 21:11:23  olle
    * changed newasmsymbol to newasmsymboldata for data symbols

  Revision 1.22  2003/03/28 19:16:56  peter
    * generic constructor working for i386
    * remove fixed self register
    * esi added as address register for i386

  Revision 1.21  2003/02/19 22:00:14  daniel
    * Code generator converted to new register notation
    - Horribily outdated todo.txt removed

  Revision 1.20  2003/01/31 22:47:27  peter
    * fix previous typeof change

  Revision 1.19  2003/01/30 21:46:57  peter
    * self fixes for static methods (merged)

  Revision 1.18  2003/01/08 18:43:56  daniel
   * Tregister changed into a record

  Revision 1.17  2002/11/25 17:43:18  peter
    * splitted defbase in defutil,symutil,defcmp
    * merged isconvertable and is_equal into compare_defs(_ext)
    * made operator search faster by walking the list only once

  Revision 1.16  2002/10/05 12:43:25  carl
    * fixes for Delphi 6 compilation
     (warning : Some features do not work under Delphi)

  Revision 1.15  2002/09/30 07:00:46  florian
    * fixes to common code to get the alpha compiler compiled applied

  Revision 1.14  2002/09/17 18:54:02  jonas
    * a_load_reg_reg() now has two size parameters: source and dest. This
      allows some optimizations on architectures that don't encode the
      register size in the register name.

  Revision 1.13  2002/08/13 18:01:52  carl
    * rename swatoperands to swapoperands
    + m68k first compilable version (still needs a lot of testing):
        assembler generator, system information , inline
        assembler reader.

  Revision 1.12  2002/08/11 14:32:26  peter
    * renamed current_library to objectlibrary

  Revision 1.11  2002/08/11 13:24:11  peter
    * saving of asmsymbols in ppu supported
    * asmsymbollist global is removed and moved into a new class
      tasmlibrarydata that will hold the info of a .a file which
      corresponds with a single module. Added librarydata to tmodule
      to keep the library info stored for the module. In the future the
      objectfiles will also be stored to the tasmlibrarydata class
    * all getlabel/newasmsymbol and friends are moved to the new class

  Revision 1.10  2002/08/05 18:27:48  carl
    + more more more documentation
    + first version include/exclude (can't test though, not enough scratch for i386 :()...

  Revision 1.9  2002/08/04 19:06:41  carl
    + added generic exception support (still does not work!)
    + more documentation

  Revision 1.8  2002/07/31 07:54:59  jonas
    * re-enabled second_assigned()

  Revision 1.7  2002/07/30 20:50:43  florian
    * the code generator knows now if parameters are in registers

  Revision 1.6  2002/07/29 21:23:42  florian
    * more fixes for the ppc
    + wrappers for the tcnvnode.first_* stuff introduced

  Revision 1.5  2002/07/28 20:45:22  florian
    + added direct assembler reader for PowerPC

  Revision 1.4  2002/07/26 09:45:20  florian
    * fixed a mistake in yesterday's commit, forgot to commit it

  Revision 1.3  2002/07/25 22:58:30  florian
  no message

  Revision 1.2  2002/07/25 17:55:41  carl
    + First working revision

  Revision 1.1  2002/07/24 04:07:49  carl
   + first revision (incomplete)
}