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

    Generate PowerPC assembler for in set/case 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 nppcset;

{$i fpcdefs.inc}

interface

    uses
       node,nset,ncgset,cpubase,cginfo,cgbase,cgobj,aasmbase,aasmtai;

    type

       tppccasenode = class(tcgcasenode)
         protected
           procedure genlinearlist(hp : pcaserecord); override;
       end;


implementation

    uses
      globtype,systems,
      verbose,globals,
      symconst,symdef,defbase,
      paramgr,
      pass_2,cgcpu,
      ncon,
      cga,tgobj,ncgutil,regvars,rgobj,aasmcpu;



{*****************************************************************************
                            TCGCASENODE
*****************************************************************************}


    procedure tppccasenode.genlinearlist(hp : pcaserecord);

      var
         first : boolean;
         last : TConstExprInt;
         resflags: tresflags;

      procedure genitem(t : pcaserecord);

          procedure gensub(value:longint);
          var
            tmpreg: tregister;
          begin
            value := -value;
            if (value >= low(smallint)) and
               (value <= high(smallint)) then
              exprasmlist.concat(taicpu.op_reg_reg_const(A_ADDIC_,hregister,
                hregister,value))
            else
              begin
                tmpreg := cg.get_scratch_reg_int(exprasmlist);
                cg.a_load_const_reg(exprasmlist,OS_INT,value,tmpreg);
                exprasmlist.concat(taicpu.op_reg_reg_reg(A_ADD_,hregister,
                  hregister,tmpreg));
                cg.free_scratch_reg(exprasmlist,tmpreg);
              end;
          end;

        begin
           if assigned(t^.less) then
             genitem(t^.less);
           { need we to test the first value }
           if first and (t^._low>get_min_value(left.resulttype.def)) then
             begin
               cg.a_cmp_const_reg_label(exprasmlist,OS_INT,jmp_lt,
                 longint(t^._low),hregister,elselabel);
             end;
           if t^._low=t^._high then
             begin
                if t^._low-last=0 then
                  exprasmlist.concat(taicpu.op_reg_reg_const(A_CMPWI,R_CR0,
                    hregister,0))
                else
                  gensub(longint(t^._low-last));
                last:=t^._low;
                resflags.cr := R_CR0;
                resflags.flag := F_EQ;
                cg.a_jmp_flags(exprasmlist,resflags,t^.statement);
             end
           else
             begin
                { it begins with the smallest label, if the value }
                { is even smaller then jump immediately to the    }
                { ELSE-label                                }
                if first then
                  begin
                     { have we to ajust the first value ? }
                     if (t^._low>get_min_value(left.resulttype.def)) then
                       gensub(longint(t^._low));
                  end
                else
                  begin
                    { if there is no unused label between the last and the }
                    { present label then the lower limit can be checked    }
                    { immediately. else check the range in between:       }

                    { note: you can't use gensub() here because dec doesn't }
                    { change the carry flag (needed for jmp_lxx) (JM)       }
                    gensub(longint(t^._low-last));
                    tcgppc(cg).a_jmp_cond(exprasmlist,jmp_lt,elselabel);
                  end;
                gensub(longint(t^._high-t^._low));
                tcgppc(cg).a_jmp_cond(exprasmlist,jmp_le,t^.statement);
                last:=t^._high;
             end;
           first:=false;
           if assigned(t^.greater) then
             genitem(t^.greater);
        end;

      begin
         { do we need to generate cmps? }
         if (with_sign and (min_label<0)) then
           genlinearcmplist(hp)
         else
           begin
              last:=0;
              first:=true;
              genitem(hp);
              cg.a_jmp_always(exprasmlist,elselabel);
           end;
      end;




begin
   ccasenode:=tppccasenode;
end.
{
  $Log$
  Revision 1.1  2002-08-11 11:39:12  jonas
    + powerpc-specific genlinearlist

  Revision 1.13  2002/08/11 06:14:40  florian
    * fixed powerpc compilation problems

  Revision 1.12  2002/08/10 17:15:12  jonas
    * optimizations and bugfix

  Revision 1.11  2002/07/28 09:24:18  carl
  + generic case node

  Revision 1.10  2002/07/23 14:31:00  daniel
  * Added internal error when asked to generate code for 'if expr in []'

  Revision 1.9  2002/07/23 12:34:30  daniel
  * Readded old set code. To use it define 'oldset'. Activated by default
    for ppc.

  Revision 1.8  2002/07/22 11:48:04  daniel
  * Sets are now internally sets.

  Revision 1.7  2002/07/21 16:58:20  jonas
    * fixed some bugs in tcginnode.pass_2() and optimized the bit test

  Revision 1.6  2002/07/20 11:57:54  florian
    * types.pas renamed to defbase.pas because D6 contains a types
      unit so this would conflicts if D6 programms are compiled
    + Willamette/SSE2 instructions to assembler added

  Revision 1.5  2002/07/11 14:41:28  florian
    * start of the new generic parameter handling

  Revision 1.4  2002/07/07 10:16:29  florian
    * problems with last commit fixed

  Revision 1.3  2002/07/06 20:19:25  carl
  + generic set handling

  Revision 1.2  2002/07/01 16:23:53  peter
    * cg64 patch
    * basics for currency
    * asnode updates for class and interface (not finished)

  Revision 1.1  2002/06/16 08:14:56  carl
  + generic sets

}