{
    $Id$
    Copyright (c) 1998-2002 by Florian Klaempfl

    This unit implements the SPARC specific class for the register
    allocator

    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 rgcpu;

{$i fpcdefs.inc}

interface

    uses
      cpubase,
      cpuinfo,
      aasmcpu,
      aasmtai,
      cclasses,globtype,
      cginfo,cgbase,aasmbase,rgobj;

    type
      trgcpu=class(trgobj)
        function GetRegisterFpu(list:TAasmOutput;size:Tcgsize):TRegister;override;
        function GetExplicitRegisterInt(list:taasmoutput;Reg:Tnewregister):tregister;override;
        procedure UngetregisterInt(list:taasmoutput;Reg:tregister);override;
      end;


implementation

    uses
      cgobj,verbose;

    function TRgCpu.GetRegisterFpu(list:TAasmOutput;size:Tcgsize):TRegister;
      var
        i: Toldregister;
        r: Tregister;
      begin
        for i:=firstsavefpureg to lastsavefpureg do
         begin
            if (i in unusedregsfpu) and
               (
                (size=OS_F32) or
                (not odd(ord(i)-ord(R_F0)))
               ) then
              begin
                 exclude(unusedregsfpu,i);
                 include(usedinproc,i);
                 include(usedbyproc,i);
                 dec(countunusedregsfpu);
                 r.enum:=i;
                 list.concat(tai_regalloc.alloc(r));
                 result := r;
                 exit;
              end;
         end;
        internalerror(10);
      end;


    function TRgCpu.GetExplicitRegisterInt(list:TAasmOutput;reg:TNewRegister):TRegister;
      var
        r:TRegister;
      begin
        if (reg=NR_O7) or (reg=NR_I7) then
          begin
            r.enum:=R_INTREGISTER;
            r.number:=reg;
            cg.a_reg_alloc(list,r);
            result:=r;
          end
        else
          result:=inherited GetExplicitRegisterInt(list,reg);
      end;


    procedure trgcpu.UngetRegisterInt(list:taasmoutput;reg:tregister);
      begin
        if reg.enum<>R_INTREGISTER then
          internalerror(200302191);
        if (reg.number=RS_O7) or (reg.number=NR_I7) then
          cg.a_reg_dealloc(list,reg)
        else
          inherited ungetregisterint(list,reg);
      end;


begin
  rg := trgcpu.create(24); {24 registers.}
end.
{
  $Log$
  Revision 1.11  2003-06-01 21:38:07  peter
    * getregisterfpu size parameter added
    * op_const_reg size parameter added
    * sparc updates

  Revision 1.10  2003/05/31 01:00:51  peter
    * register fixes

  Revision 1.9  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 1.8  2003/03/15 22:51:58  mazen
  * remaking sparc rtl compile

  Revision 1.7  2003/03/10 21:59:54  mazen
  * fixing index overflow in handling new registers arrays.

  Revision 1.6  2003/02/19 22:00:17  daniel
    * Code generator converted to new register notation
    - Horribily outdated todo.txt removed

  Revision 1.5  2003/01/08 18:43:58  daniel
   * Tregister changed into a record

  Revision 1.4  2002/10/13 21:46:07  mazen
  * assembler output format fixed

  Revision 1.3  2002/10/12 19:03:23  mazen
  * Get/Unget expilit registers to be re-examined

}