freepascal.compiler/compiler/sparc/rgcpu.pas

{
    $Id$
    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;
        procedure UngetRegisterFpu(list:taasmoutput;reg:tregister;size:TCGsize);override;
        procedure ClearTempGen;override;
      end;


implementation

    uses
      cgobj,verbose;


    function TRgCpu.GetRegisterFpu(list:TAasmOutput;size:Tcgsize):TRegister;
      var
        i: Tsuperregister;
        r: Tregister;
      begin
        for i:=firstsavefpureg to lastsavefpureg do
         begin
            if (i in unusedregsfpu) and
               (
                (size=OS_F32) or
                (not odd(i-RS_F0))
               ) then
              begin
                 exclude(unusedregsfpu,i);
                 dec(countunusedregsfpu);
                 r:=newreg(R_FPUREGISTER,i,R_SUBNONE);
                 list.concat(tai_regalloc.alloc(r));
                 result := r;
                 { double need 2 FPU registers }
                 if size=OS_F64 then
                   begin
                     r:=newreg(R_FPUREGISTER,i+1,R_SUBNONE);
                     exclude(unusedregsfpu,i+1);
                     dec(countunusedregsfpu);
                     list.concat(tai_regalloc.alloc(r));
                   end;
                 exit;
              end;
         end;
        internalerror(10);
      end;


    procedure trgcpu.UngetRegisterFpu(list:taasmoutput;reg:tregister;size:TCGsize);
      var
        r : tregister;
        supreg : tsuperregister;
      begin
        supreg:=getsupreg(reg);
        { double need 2 FPU registers }
        if (size=OS_F64) then
          begin
            { Only even FP registers are allowed }
            if odd(supreg-RS_F0) then
              internalerror(200306101);
            r:=newreg(R_FPUREGISTER,supreg+1,R_SUBNONE);
            inc(countunusedregsfpu);
            include(unusedregsfpu,getsupreg(r));
            list.concat(tai_regalloc.dealloc(r));
          end;
        inc(countunusedregsfpu);
        include(unusedregsfpu,supreg);
        list.concat(tai_regalloc.dealloc(reg));
      end;


    procedure trgcpu.cleartempgen;
      begin
        inherited cleartempgen;
      end;

begin
  { Only use %o and %l }
  rg := trgcpu.create(16);
end.
{
  $Log$
  Revision 1.17  2003-09-03 15:55:01  peter
    * NEWRA branch merged

  Revision 1.16.2.2  2003/09/02 17:49:17  peter
    * newra updates

  Revision 1.16.2.1  2003/09/01 21:02:55  peter
    * sparc updates for new tregister

  Revision 1.16  2003/08/11 21:18:20  peter
    * start of sparc support for newra

  Revision 1.15  2003/07/02 22:18:04  peter
    * paraloc splitted in callerparaloc,calleeparaloc
    * sparc calling convention updates

  Revision 1.14  2003/06/17 16:36:11  peter
    * freeintparaloc added

  Revision 1.13  2003/06/12 22:47:52  mazen
  - unused temp var r removed in GetExplicitRegisterInt function
  * some case added for var and fauncions naming

  Revision 1.12  2003/06/12 21:11:44  peter
    * updates like the powerpc

  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

}