freepascal.compiler/compiler/sparc/cgcpu.pas

{******************************************************************************
    $Id$

    Copyright (c) 1998-2000 by Florian Klaempfl

    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 cgcpu;
{This unit implements the code generator for the SPARC architecture}
{$INCLUDE fpcdefs.inc}
INTERFACE
USES
  cginfo,cgbase,cgobj,cg64f32,
  aasmbase,aasmtai,aasmcpu,
  cpubase,cpuinfo,cpupara,
  node,symconst;
TYPE
  TCgSparc=CLASS(tcg)
{This method is used to pass a parameter, which is located in a register, to a
routine. It should give the parameter to the routine, as required by the
specific processor ABI. It is overriden for each CPU target.
  Size    : is the size of the operand in the register
  r       : is the register source of the operand
  LocPara : is the location where the parameter will be stored}
    procedure a_param_reg(list:TAasmOutput;sz:tcgsize;r:tregister;const LocPara:TParaLocation);override;
    {passes a parameter which is a constant to a function}
    procedure a_param_const(list:TAasmOutput;size:tcgsize;a:aword;CONST LocPara:TParaLocation);override;
    procedure a_param_ref(list:TAasmOutput;sz:tcgsize;CONST r:TReference;CONST LocPara:TParaLocation);override;
    procedure a_paramaddr_ref(list:TAasmOutput;CONST r:TReference;CONST LocPara:TParaLocation);override;
    procedure a_call_name(list:TAasmOutput;CONST s:string);override;
    procedure a_call_ref(list:TAasmOutput;CONST ref:TReference);override;
    procedure a_call_reg(list:TAasmOutput;Reg:TRegister);override;
    {Branch Instruction}
    procedure a_jmp_always(List:TAasmOutput;l:TAsmLabel);override;
    {General purpose instyructions}
    procedure a_op_const_reg(list:TAasmOutput;Op:TOpCG;a:AWord;reg:TRegister);override;
    procedure a_op_const_ref(list:TAasmOutput;Op:TOpCG;size:TCGSize;a:AWord;CONST ref:TReference);override;
    procedure a_op_reg_reg(list:TAasmOutput;Op:TOpCG;size:TCGSize;src, dst:TRegister);override;
    procedure a_op_ref_reg(list:TAasmOutput;Op:TOpCG;size:TCGSize;CONST ref:TReference;reg:TRegister);override;
    procedure a_op_reg_ref(list:TAasmOutput;Op:TOpCG;size:TCGSize;reg:TRegister;CONST ref:TReference);override;
    procedure a_op_const_reg_reg(list:TAasmOutput;op:TOpCg;size:tcgsize;a:aword;src, dst:tregister);override;
    procedure a_op_reg_reg_reg(list:TAasmOutput;op:TOpCg;size:tcgsize;src1, src2, dst:tregister);override;
        { move instructions }
    procedure a_load_const_reg(list:TAasmOutput;size:tcgsize;a:aword;reg:tregister);override;
    procedure a_load_const_ref(list:TAasmOutput;size:tcgsize;a:aword;CONST ref:TReference);override;
    procedure a_load_reg_ref(list:TAasmOutput;size:tcgsize;reg:tregister;CONST ref:TReference);override;
    procedure a_load_ref_reg(list:TAasmOutput;size:tcgsize;CONST ref:TReference;reg:tregister);override;
    procedure a_load_reg_reg(list:TAasmOutput;fromsize,tosize:tcgsize;reg1,reg2:tregister);override;
    procedure a_loadaddr_ref_reg(list:TAasmOutput;CONST ref:TReference;r:tregister);override;
        { fpu move instructions }
    procedure a_loadfpu_reg_reg(list:TAasmOutput;reg1, reg2:tregister);override;
    procedure a_loadfpu_ref_reg(list:TAasmOutput;size:tcgsize;CONST ref:TReference;reg:tregister);override;
    procedure a_loadfpu_reg_ref(list:TAasmOutput;size:tcgsize;reg:tregister;CONST ref:TReference);override;
        { vector register move instructions }
    procedure a_loadmm_reg_reg(list:TAasmOutput;reg1, reg2:tregister);override;
    procedure a_loadmm_ref_reg(list:TAasmOutput;CONST ref:TReference;reg:tregister);override;
    procedure a_loadmm_reg_ref(list:TAasmOutput;reg:tregister;CONST ref:TReference);override;
    procedure a_parammm_reg(list:TAasmOutput;reg:tregister);override;
        {  comparison operations }
    procedure a_cmp_const_reg_label(list:TAasmOutput;size:tcgsize;cmp_op:topcmp;a:aword;reg:tregister;l:tasmlabel);override;
    procedure a_cmp_const_ref_label(list:TAasmOutput;size:tcgsize;cmp_op:topcmp;a:aword;CONST ref:TReference;l:tasmlabel);override;
    procedure a_cmp_reg_reg_label(list:TAasmOutput;size:tcgsize;cmp_op:topcmp;reg1,reg2:tregister;l:tasmlabel);override;
    procedure a_cmp_ref_reg_label(list:TAasmOutput;size:tcgsize;cmp_op:topcmp;CONST ref:TReference;reg:tregister;l:tasmlabel);override;
    procedure a_jmp_cond(list:TAasmOutput;cond:TOpCmp;l:tasmlabel);{ override;}
    procedure a_jmp_flags(list:TAasmOutput;CONST f:TResFlags;l:tasmlabel);override;
    procedure g_flags2reg(list:TAasmOutput;Size:TCgSize;CONST f:tresflags;reg:TRegister);override;
    procedure g_overflowCheck(List:TAasmOutput;const p:TNode);override;
    procedure g_stackframe_entry(list:TAasmOutput;localsize:LongInt);override;
    procedure g_restore_all_registers(list:TAasmOutput;accused,acchiused:boolean);override;
    procedure g_restore_frame_pointer(list:TAasmOutput);override;
    procedure g_restore_standard_registers(list:taasmoutput;usedinproc:Tsupregset);override;
    procedure g_return_from_proc(list:TAasmOutput;parasize:aword);override;
    procedure g_save_all_registers(list : taasmoutput);override;
    procedure g_save_standard_registers(list : taasmoutput; usedinproc : Tsupregset);override;
    procedure g_concatcopy(list:TAasmOutput;CONST source,dest:TReference;len:aword;delsource,loadref:boolean);override;
    class function reg_cgsize(CONST reg:tregister):tcgsize;override;
  PRIVATE
    function IsSimpleRef(const ref:treference):boolean;
    procedure sizes2load(s1:tcgsize;s2:topsize;var op:tasmop;var s3:topsize);
    procedure floatload(list:TAasmOutput;t:tcgsize;CONST ref:TReference);
    procedure floatstore(list:TAasmOutput;t:tcgsize;CONST ref:TReference);
    procedure floatloadops(t:tcgsize;var op:tasmop;var s:topsize);
    procedure floatstoreops(t:tcgsize;var op:tasmop;var s:topsize);
  END;
  TCg64Sparc=class(tcg64f32)
    procedure a_op64_ref_reg(list:TAasmOutput;op:TOpCG;CONST ref:TReference;reg:TRegister64);override;
    procedure a_op64_reg_reg(list:TAasmOutput;op:TOpCG;regsrc,regdst:TRegister64);override;
    procedure a_op64_const_reg(list:TAasmOutput;op:TOpCG;value:qWord;regdst:TRegister64);override;
    procedure a_op64_const_ref(list:TAasmOutput;op:TOpCG;value:qWord;CONST ref:TReference);override;
    procedure get_64bit_ops(op:TOpCG;var op1,op2:TAsmOp);
  END;
CONST
  TOpCG2AsmOp:ARRAY[topcg]OF TAsmOp=(A_NONE,A_ADD,A_AND,A_UDIV,A_SDIV,A_UMUL, A_SMUL, A_NEG,A_NOT,A_OR,A_not,A_not,A_not,A_SUB,A_XOR);
  TOpCmp2AsmCond:ARRAY[topcmp]OF TAsmCond=(C_NONE,C_E,C_G,C_L,C_GE,C_LE,C_NE,C_BE,C_B,C_AE,C_A);
  TCGSize2OpSize:ARRAY[tcgsize]OF TOpSize=(S_NO,S_B,S_W,S_SW,S_SW,S_B,S_W,S_SW,S_SW,S_FS,S_FD,S_FQ,S_NO,S_NO,S_NO,S_NO,S_NO,S_NO,S_NO,S_NO,S_NO,S_NO,S_NO,S_NO);

IMPLEMENTATION
USES
  globtype,globals,verbose,systems,cutils,
  symdef,symsym,defutil,paramgr,
  rgobj,tgobj,rgcpu,cpupi;
procedure TCgSparc.a_param_reg(list:TAasmOutput;sz:tcgsize;r:tregister;const LocPara:TParaLocation);
  var
    r2:Tregister;
  begin
    r2.enum:=R_G0;
    with list,LocPara do
      case Loc of
        LOC_REGISTER:
          case Sz of
            OS_8,OS_S8:
              Concat(taicpu.op_Reg_Const_Reg(A_AND,r,$FF,Register));
            OS_16,OS_S16:
              begin
                Concat(taicpu.op_Reg_Reg_Reg(A_AND,r,r2,Register));
                {This will put 00...00111 in the hiest 22 bits of the reg}
                Concat(taicpu.op_Reg_Const_Reg(A_SETHI,Register,$7,Register));
              end;
            OS_32,OS_S32:
              if r.enum<>Register.enum
              then
                Concat(taicpu.op_Reg_Reg_Reg(A_OR,r,r2,Register));
            else
              InternalError(2002032212);
          end;
        else
          InternalError(2002101002);
      end;
  end;
procedure TCgSparc.a_param_const(list:TAasmOutput;size:tcgsize;a:aword;CONST LocPara:TParaLocation);
  var
    Ref:TReference;
  begin
    with List do
      case locpara.loc of
        LOC_REGISTER,LOC_CREGISTER:
          a_load_const_reg(list,size,a,locpara.register);
        LOC_REFERENCE:
          begin
            reference_reset(ref);
            ref.base:=locpara.reference.index;
            ref.offset:=locpara.reference.offset;
            a_load_const_ref(list,size,a,ref);
          end;
        else
          InternalError(2002122200);
      end;
    if locpara.sp_fixup<>0
    then
      InternalError(2002122201);
  end;
procedure TCgSparc.a_param_ref(list:TAasmOutput;sz:TCgSize;const r:TReference;const LocPara:TParaLocation);
  var
    ref: treference;
    tmpreg:TRegister;
  begin
    with LocPara do
      case locpara.loc of
        LOC_REGISTER,LOC_CREGISTER:
          a_load_ref_reg(list,sz,r,Register);
        LOC_REFERENCE:
          begin
          {Code conventions need the parameters being allocated in %o6+92. See
          comment on g_stack_frame}
            if locpara.sp_fixup<92
            then
              InternalError(2002081104);
            reference_reset(ref);
            ref.base:=locpara.reference.index;
            ref.offset:=locpara.reference.offset;
            tmpreg := get_scratch_reg_int(list,sz);
            a_load_ref_reg(list,sz,r,tmpreg);
            a_load_reg_ref(list,sz,tmpreg,ref);
            free_scratch_reg(list,tmpreg);
          end;
        LOC_FPUREGISTER,LOC_CFPUREGISTER:
                case sz of
                OS_32:
                a_loadfpu_ref_reg(list,OS_F32,r,locpara.register);
                  OS_64:
                  a_loadfpu_ref_reg(list,OS_F64,r,locpara.register);
            else
            internalerror(2002072801);
                end;
                else
                internalerror(2002081103);
        end;
  end;
procedure TCgSparc.a_paramaddr_ref(list:TAasmOutput;CONST r:TReference;CONST LocPara:TParaLocation);
  var
    Ref:TReference;
    TmpReg:TRegister;
  begin
    case locpara.loc of
      LOC_REGISTER,LOC_CREGISTER:
        a_loadaddr_ref_reg(list,r,locpara.register);
      LOC_REFERENCE:
        begin
          reference_reset(ref);
          ref.base := locpara.reference.index;
          ref.offset := locpara.reference.offset;
          tmpreg := get_scratch_reg_address(list);
          a_loadaddr_ref_reg(list,r,tmpreg);
          a_load_reg_ref(list,OS_ADDR,tmpreg,ref);
          free_scratch_reg(list,tmpreg);
        end;
    else
      internalerror(2002080701);
    end;
  end;
procedure TCgSparc.a_call_name(list:TAasmOutput;CONST s:string);
  BEGIN
    WITH List,objectlibrary DO
      BEGIN
        concat(taicpu.op_sym(A_CALL,S_SW,newasmsymbol(s)));
        concat(taicpu.op_none(A_NOP));
      END;
  END;
procedure TCgSparc.a_call_ref(list:TAasmOutput;CONST ref:TReference);
  begin
    list.concat(taicpu.op_ref(A_CALL,ref));
    list.concat(taicpu.op_none(A_NOP));
  end;
procedure TCgSparc.a_call_reg(list:TAasmOutput;Reg:TRegister);
  var
    RetAddrReg:TRegister;
  begin
    with RetAddrReg do
      begin
        enum:=R_INTREGISTER;
        Number:=NR_O7;
      end;
    list.concat(taicpu.op_reg_reg(A_JMPL,reg,RetAddrReg));
    if target_info.system=system_sparc_linux
    then
      list.concat(taicpu.op_none(A_NOP));
    include(current_procinfo.flags,pi_do_call);
 end;
{********************** branch instructions ********************}
procedure TCgSparc.a_jmp_always(List:TAasmOutput;l:TAsmLabel);
  begin
    List.Concat(TAiCpu.op_sym(A_BA,S_NO,objectlibrary.newasmsymbol(l.name)));
  end;
{********************** load instructions ********************}
procedure TCgSparc.a_load_const_reg(list:TAasmOutput;size:TCGSize;a:aword;reg:TRegister);
  var
    r:Tregister;
  begin
    r.enum:=R_G0;
    with List do
      if a=0
      then{R_G0 is usually set to zero, so we use it}
        Concat(taicpu.op_reg_reg_reg(A_OR,r,r,reg))
      else{There is no A_MOV in sparc, that's why we use A_OR with help of R_G0}
        begin
          Concat(taicpu.op_reg_const_reg(A_OR,r,a and $00001FFF,reg));
          a:=a and $FFFFE000;
          if a<>0
          then
            Concat(taicpu.op_const_reg(A_SETHI,a,reg));
        end;
  END;
procedure TCgSparc.a_load_const_ref(list:TAasmOutput;size:tcgsize;a:aword;CONST ref:TReference);

var r:Tregister;

  BEGIN
    r.enum:=R_G0;
    WITH List DO
      IF a=0
      THEN
        Concat(taicpu.op_reg_ref(A_ST,r,Ref))
      ELSE
        BEGIN
          r.enum:=R_G1;
          a_load_const_reg(list,size,a,r);
          a_load_reg_ref(list,size,r,Ref);
        END;
  END;
procedure TCgSparc.a_load_reg_ref(list:TAasmOutput;size:TCGSize;reg:tregister;const Ref:TReference);
  var
    op:tasmop;
  begin
    case size of
      { signed integer registers }
      OS_S8:
        Op:=A_STB;{Store Signed Byte}
      OS_S16:
        Op:=A_STH;{Store Signed Halfword}
      OS_S32:
        Op:=A_ST;{Store Word}
      OS_S64:
        Op:=A_STD;{Store Double Word}
      { unsigned integer registers }
    //A_STSTUB;{Store-Store Unsigned Byte}
      OS_8:
        Op:=A_STB;{Store Unsigned Bye}
      OS_16:
        Op:=A_STH;{Store Unsigned Halfword}
      OS_32:
        Op:=A_ST;{Store Word}
      OS_64:
        Op:=A_STD;{Store Double Word}
      { floating-point real registers }
      OS_F32:
        Op:=A_STF;{Store Floating-point word}
    //A_STFSR
      OS_F64:
        Op:=A_STDF;{Store Double Floating-point word}
      //A_STC;{Store Coprocessor}
      //A_STCSR;
      //A_STDC;{Store Double Coprocessor}
      else
        InternalError(2002122100);
    end;
    with list do
      concat(taicpu.op_reg_ref(op,reg,ref));
  end;
procedure TCgSparc.a_load_ref_reg(list:TAasmOutput;size:TCgSize;const ref:TReference;reg:tregister);
  var
    op:tasmop;
  begin
    case size of
      { signed integer registers }
      OS_S8:
        Op:=A_LDSB;{Load Signed Byte}
      OS_S16:
        Op:=A_LDSH;{Load Signed Halfword}
      OS_S32:
        Op:=A_LD;{Load Word}
      OS_S64:
        Op:=A_LDD;{Load Double Word}
      { unsigned integer registers }
    //A_LDSTUB;{Load-Store Unsigned Byte}
      OS_8:
        Op:=A_LDUB;{Load Unsigned Bye}
      OS_16:
        Op:=A_LDUH;{Load Unsigned Halfword}
      OS_32:
        Op:=A_LD;{Load Word}
      OS_64:
        Op:=A_LDD;{Load Double Word}
      { floating-point real registers }
      OS_F32:
        Op:=A_LDF;{Load Floating-point word}
    //A_LDFSR
      OS_F64:
        Op:=A_LDDF;{Load Double Floating-point word}
      //A_LDC;{Load Coprocessor}
      //A_LDCSR;
      //A_LDDC;{Load Double Coprocessor}
      else
        InternalError(2002122100);
    end;
    with list do
      concat(taicpu.op_ref_reg(op,ref,reg));
  end;
procedure TCgSparc.a_load_reg_reg(list:TAasmOutput;fromsize,tosize:tcgsize;reg1,reg2:tregister);
  var
    op:tasmop;
    s:topsize;
    r:Tregister;
  begin
    r.enum:=R_G0;
    if(reg1.enum<>reg2.enum)or
      (tcgsize2size[tosize]<tcgsize2size[fromsize])or
      ((tcgsize2size[tosize] = tcgsize2size[fromsize])and
        (tosize <> fromsize)and
        not(fromsize in [OS_32,OS_S32]))
    then
      with list do
        case fromsize of
          OS_8,OS_S8,OS_16,OS_S16,OS_32,OS_S32:
            concat(taicpu.op_reg_reg_reg(A_OR,r,reg1,reg2));
          else internalerror(2002090901);
        end;
  end;
    { all fpu load routines expect that R_ST[0-7] means an fpu regvar and }
    { R_ST means "the current value at the top of the fpu stack" (JM)     }
procedure TCgSparc.a_loadfpu_reg_reg(list:TAasmOutput;reg1, reg2:tregister);

       begin
{         if NOT (reg1 IN [R_F0..R_F31]) then
           begin
             list.concat(taicpu.op_reg(A_NONE,S_NO,
               trgcpu(rg).correct_fpuregister(reg1,trgcpu(rg).fpuvaroffset)));
             inc(trgcpu(rg).fpuvaroffset);
           end;
         if NOT (reg2 IN [R_F0..R_F31]) then
           begin
             list.concat(taicpu.op_reg(A_JMPL,S_NO,
                 trgcpu(rg).correct_fpuregister(reg2,trgcpu(rg).fpuvaroffset)));
             dec(trgcpu(rg).fpuvaroffset);
           end;}
       end;


    procedure TCgSparc.a_loadfpu_ref_reg(list:TAasmOutput;size:tcgsize;CONST ref:TReference;reg:tregister);

       begin
         floatload(list,size,ref);
{         if (reg <> R_ST) then
           a_loadfpu_reg_reg(list,R_ST,reg);}
       end;


    procedure TCgSparc.a_loadfpu_reg_ref(list:TAasmOutput;size:tcgsize;reg:tregister;const ref:TReference);
       const
         FpuStoreInstr: Array[OS_F32..OS_F64,boolean, boolean] of TAsmOp =
                            { indexed? updating?}
                    (((A_STF,A_STF),(A_STF,A_STF)),
                     ((A_STDF,A_STDF),(A_STDF,A_STDF)));
       var
         op: tasmop;
         ref2: treference;
         freereg: boolean;
       begin
         if not(size in [OS_F32,OS_F64])
         then
           internalerror(200201122);
{         ref2:=ref;
         freereg:=fixref(list,ref2);
         op:=fpustoreinstr[size,ref2.index.enum <> R_NO,false];
         a_load_store(list,op,reg,ref2);
         if freereg
         then
           cg.free_scratch_reg(list,ref2.base);}
       end;


    procedure TCgSparc.a_loadmm_reg_reg(list:TAasmOutput;reg1, reg2:tregister);

       begin
//         list.concat(taicpu.op_reg_reg(A_NONEQ,S_NO,reg1,reg2));
       end;


    procedure TCgSparc.a_loadmm_ref_reg(list:TAasmOutput;CONST ref:TReference;reg:tregister);

       begin
//         list.concat(taicpu.op_ref_reg(A_NONEQ,S_NO,ref,reg));
       end;


    procedure TCgSparc.a_loadmm_reg_ref(list:TAasmOutput;reg:tregister;CONST ref:TReference);

       begin
//         list.concat(taicpu.op_reg_ref(A_NONEQ,S_NO,reg,ref));
       end;
procedure TCgSparc.a_parammm_reg(list:TAasmOutput;reg:tregister);
  VAR
    href:TReference;
  BEGIN
//    list.concat(taicpu.op_const_reg(A_SUB,S_SW,8,R_RSP));
//    reference_reset_base(href,R_ESP,0);
//    list.concat(taicpu.op_reg_ref(A_NONEQ,S_NO,reg,href));
  END;
procedure TCgSparc.a_op_const_reg(list:TAasmOutput;Op:TOpCG;a:AWord;reg:TRegister);

      var
        opcode:tasmop;
        power:LongInt;

      begin
(*       Case Op of
          OP_DIV, OP_IDIV:
            Begin
              if ispowerof2(a,power) then
                begin
                  case op of
                    OP_DIV:
                      opcode := A_SHR;
                    OP_IDIV:
                      opcode := A_SAR;
                  end;
                  list.concat(taicpu.op_const_reg(opcode,S_SW,power,
                    reg));
                  exit;
                end;
              { the rest should be handled specifically in the code      }
              { generator because of the silly register usage restraints }
              internalerror(200109224);
            End;
          OP_MUL,OP_IMUL:
            begin
              if not(cs_check_overflow in aktlocalswitches) and
                 ispowerof2(a,power) then
                begin
                  list.concat(taicpu.op_const_reg(A_SHL,S_SW,power,
                    reg));
                  exit;
                end;
              if op = OP_IMUL then
                list.concat(taicpu.op_const_reg(A_IMUL,S_SW,
                  a,reg))
              else
                { OP_MUL should be handled specifically in the code        }
                { generator because of the silly register usage restraints }
                internalerror(200109225);
            end;
          OP_ADD, OP_AND, OP_OR, OP_SUB, OP_XOR:
            if not(cs_check_overflow in aktlocalswitches) and
               (a = 1) and
               (op in [OP_ADD,OP_SUB]) then
              if op = OP_ADD then
                list.concat(taicpu.op_reg(A_INC,S_SW,reg))
              else
                list.concat(taicpu.op_reg(A_DEC,S_SW,reg))
            else if (a = 0) then
              if (op <> OP_AND) then
                exit
              else
                list.concat(taicpu.op_const_reg(A_NONE,S_SW,0,reg))
            else if (a = high(aword)) and
                    (op in [OP_AND,OP_OR,OP_XOR]) then
                   begin
                     case op of
                       OP_AND:
                         exit;
                       OP_OR:
                         list.concat(taicpu.op_const_reg(A_NONE,S_SW,high(aword),reg));
                       OP_XOR:
                         list.concat(taicpu.op_reg(A_NOT,S_SW,reg));
                     end
                   end
            else
              list.concat(taicpu.op_const_reg(TOpCG2AsmOp[op],S_SW,
                a,reg));
          OP_SHL,OP_SHR,OP_SAR:
            begin
              if (a and 31) <> 0 Then
                list.concat(taicpu.op_const_reg(
                  TOpCG2AsmOp[op],S_SW,a and 31,reg));
              if (a shr 5) <> 0 Then
                internalerror(68991);
            end
          else internalerror(68992);
        end;*)
      end;


     procedure TCgSparc.a_op_const_ref(list:TAasmOutput;Op:TOpCG;size:TCGSize;a:AWord;CONST ref:TReference);

      var
        opcode:tasmop;
        power:LongInt;

      begin
(*        Case Op of
          OP_DIV, OP_IDIV:
            Begin
              if ispowerof2(a,power) then
                begin
                  case op of
                    OP_DIV:
                      opcode := A_SHR;
                    OP_IDIV:
                      opcode := A_SAR;
                  end;
                  list.concat(taicpu.op_const_ref(opcode,
                    TCgSize2OpSize[size],power,ref));
                  exit;
                end;
              { the rest should be handled specifically in the code      }
              { generator because of the silly register usage restraints }
              internalerror(200109231);
            End;
          OP_MUL,OP_IMUL:
            begin
              if not(cs_check_overflow in aktlocalswitches) and
                 ispowerof2(a,power) then
                begin
                  list.concat(taicpu.op_const_ref(A_SHL,TCgSize2OpSize[size],
                    power,ref));
                  exit;
                end;
              { can't multiply a memory location directly with a CONSTant }
              if op = OP_IMUL then
                inherited a_op_const_ref(list,op,size,a,ref)
              else
                { OP_MUL should be handled specifically in the code        }
                { generator because of the silly register usage restraints }
                internalerror(200109232);
            end;
          OP_ADD, OP_AND, OP_OR, OP_SUB, OP_XOR:
            if not(cs_check_overflow in aktlocalswitches) and
               (a = 1) and
               (op in [OP_ADD,OP_SUB]) then
              if op = OP_ADD then
                list.concat(taicpu.op_ref(A_INC,TCgSize2OpSize[size],ref))
              else
                list.concat(taicpu.op_ref(A_DEC,TCgSize2OpSize[size],ref))
            else if (a = 0) then
              if (op <> OP_AND) then
                exit
              else
                a_load_const_ref(list,size,0,ref)
            else if (a = high(aword)) and
                    (op in [OP_AND,OP_OR,OP_XOR]) then
                   begin
                     case op of
                       OP_AND:
                         exit;
                       OP_OR:
                         list.concat(taicpu.op_const_ref(A_NONE,TCgSize2OpSize[size],high(aword),ref));
                       OP_XOR:
                         list.concat(taicpu.op_ref(A_NOT,TCgSize2OpSize[size],ref));
                     end
                   end
            else
              list.concat(taicpu.op_const_ref(TOpCG2AsmOp[op],
                TCgSize2OpSize[size],a,ref));
          OP_SHL,OP_SHR,OP_SAR:
            begin
              if (a and 31) <> 0 Then
                list.concat(taicpu.op_const_ref(
                  TOpCG2AsmOp[op],TCgSize2OpSize[size],a and 31,ref));
              if (a shr 5) <> 0 Then
                internalerror(68991);
            end
          else internalerror(68992);
        end;*)
      end;


     procedure TCgSparc.a_op_reg_reg(list:TAasmOutput;Op:TOpCG;size:TCGSize;src, dst:TRegister);

        var
          regloadsize:tcgsize;
          dstsize:topsize;
          tmpreg:tregister;
          popecx:boolean;

        begin
(*          dstsize := S_Q{makeregsize(dst,size)};
          case op of
            OP_NEG,OP_NOT:
              begin
                if src <> R_NO then
                  internalerror(200112291);
                list.concat(taicpu.op_reg(TOpCG2AsmOp[op],dstsize,dst));
              end;
            OP_MUL,OP_DIV,OP_IDIV:
              { special stuff, needs separate handling inside code }
              { generator                                          }
              internalerror(200109233);
            OP_SHR,OP_SHL,OP_SAR:
              begin
                tmpreg := R_NO;
                { we need cl to hold the shift count, so if the destination }
                { is ecx, save it to a temp for now                         }
                if dst in [R_ECX,R_CX,R_CL] then
                  begin
                    case S_SW of
                      S_B:regloadsize := OS_8;
                      S_W:regloadsize := OS_16;
                      else regloadsize := OS_32;
                    end;
                    tmpreg := get_scratch_reg(list);
                    a_load_reg_reg(list,regloadsize,OS_32,src,tmpreg);
                  end;
                if not(src in [R_ECX,R_CX,R_CL]) then
                  begin
                    { is ecx still free (it's also free if it was allocated }
                    { to dst, since we've moved dst somewhere else already) }
                    if not((dst = R_ECX) or
                           ((R_ECX in rg.unusedregsint) and
                            { this will always be true, it's just here to }
                            { allocate ecx                                }
                            (rg.getexplicitregisterint(list,R_ECX) = R_ECX))) then
                      begin
                        list.concat(taicpu.op_reg(A_NONE,S_SW,R_ECX));
                        popecx := true;
                      end;
                    a_load_reg_reg(list,OS_8,OS_8,(src),R_CL);
                  end
                else
                  src := R_CL;
                { do the shift }
                if tmpreg = R_NO then
                  list.concat(taicpu.op_reg_reg(TOpCG2AsmOp[op],dstsize,
                    R_CL,dst))
                else
                  begin
                    list.concat(taicpu.op_reg_reg(TOpCG2AsmOp[op],S_SW,
                      R_CL,tmpreg));
                    { move result back to the destination }
                    a_load_reg_reg(list,OS_32,OS_32,tmpreg,R_ECX);
                    free_scratch_reg(list,tmpreg);
                  end;
                if popecx then
                  list.concat(taicpu.op_reg(A_POP,S_SW,R_ECX))
                else if not (dst in [R_ECX,R_CX,R_CL]) then
                  rg.ungetregisterint(list,R_ECX);
              end;
            else
              begin
                if S_SW <> dstsize then
                  internalerror(200109226);
                list.concat(taicpu.op_reg_reg(TOpCG2AsmOp[op],dstsize,
                  src,dst));
              end;
          end;*)
        end;


     procedure TCgSparc.a_op_ref_reg(list:TAasmOutput;Op:TOpCG;size:TCGSize;CONST ref:TReference;reg:TRegister);

       var
         opsize:topsize;

       begin
(*          case op of
            OP_NEG,OP_NOT,OP_IMUL:
              begin
                inherited a_op_ref_reg(list,op,size,ref,reg);
              end;
            OP_MUL,OP_DIV,OP_IDIV:
              { special stuff, needs separate handling inside code }
              { generator                                          }
              internalerror(200109239);
            else
              begin
                opsize := S_Q{makeregsize(reg,size)};
                list.concat(taicpu.op_ref_reg(TOpCG2AsmOp[op],opsize,ref,reg));
              end;
          end;*)
       end;


     procedure TCgSparc.a_op_reg_ref(list:TAasmOutput;Op:TOpCG;size:TCGSize;reg:TRegister;CONST ref:TReference);

       var
         opsize:topsize;

       begin
(*         case op of
           OP_NEG,OP_NOT:
             begin
               if reg <> R_NO then
                 internalerror(200109237);
               list.concat(taicpu.op_ref(TOpCG2AsmOp[op],tcgsize2opsize[size],ref));
             end;
           OP_IMUL:
             begin
               { this one needs a load/imul/store, which is the default }
               inherited a_op_ref_reg(list,op,size,ref,reg);
             end;
           OP_MUL,OP_DIV,OP_IDIV:
             { special stuff, needs separate handling inside code }
             { generator                                          }
             internalerror(200109238);
           else
             begin
               opsize := tcgsize2opsize[size];
               list.concat(taicpu.op_reg_ref(TOpCG2AsmOp[op],opsize,reg,ref));
             end;
         end;*)
       end;


    procedure TCgSparc.a_op_const_reg_reg(list:TAasmOutput;op:TOpCg;
        size:tcgsize;a:aword;src, dst:tregister);
      var
        tmpref:TReference;
        power:LongInt;
        opsize:topsize;
      begin
        opsize := S_SW;
        if (opsize <> S_SW) or
           not (size in [OS_32,OS_S32]) then
          begin
            inherited a_op_const_reg_reg(list,op,size,a,src,dst);
            exit;
          end;
        { if we get here, we have to do a 32 bit calculation, guaranteed }
        Case Op of
          OP_DIV, OP_IDIV, OP_MUL, OP_AND, OP_OR, OP_XOR, OP_SHL, OP_SHR,
          OP_SAR:
            { can't do anything special for these }
            inherited a_op_const_reg_reg(list,op,size,a,src,dst);
          OP_IMUL:
            begin
              if not(cs_check_overflow in aktlocalswitches) and
                 ispowerof2(a,power) then
                { can be done with a shift }
                inherited a_op_const_reg_reg(list,op,size,a,src,dst);
              list.concat(taicpu.op_reg_const_reg(A_SMUL,src,a,dst));
            end;
          OP_ADD, OP_SUB:
            if (a = 0) then
              a_load_reg_reg(list,size,size,src,dst)
            else
              begin
                reference_reset(tmpref);
                tmpref.base := src;
                tmpref.offset := LongInt(a);
                if op = OP_SUB then
                  tmpref.offset := -tmpref.offset;
                list.concat(taicpu.op_ref_reg(A_NONE,tmpref,dst));
              end
          else internalerror(200112302);
        end;
      end;

    procedure TCgSparc.a_op_reg_reg_reg(list:TAasmOutput;op:TOpCg;
        size:tcgsize;src1, src2, dst:tregister);
      var
        tmpref:TReference;
        opsize:topsize;
      begin
        opsize := S_SW;
        if (opsize <> S_SW) or
           (S_SW <> S_SW) or
           not (size in [OS_32,OS_S32]) then
          begin
            inherited a_op_reg_reg_reg(list,op,size,src1,src2,dst);
            exit;
          end;
        { if we get here, we have to do a 32 bit calculation, guaranteed }
        Case Op of
          OP_DIV, OP_IDIV, OP_MUL, OP_AND, OP_OR, OP_XOR, OP_SHL, OP_SHR,
          OP_SAR,OP_SUB,OP_NOT,OP_NEG:
            { can't do anything special for these }
            inherited a_op_reg_reg_reg(list,op,size,src1,src2,dst);
          OP_IMUL:
            list.concat(taicpu.op_reg_reg_reg(A_SMUL,src1,src2,dst));
          OP_ADD:
            begin
              reference_reset(tmpref);
              tmpref.base := src1;
              tmpref.index := src2;
              tmpref.scalefactor := 1;
              list.concat(taicpu.op_ref_reg(A_NONE,tmpref,dst));
            end
          else internalerror(200112303);
        end;
      end;

{*************** compare instructructions ****************}
procedure TCgSparc.a_cmp_const_reg_label(list:TAasmOutput;size:tcgsize;cmp_op:topcmp;a:aword;reg:tregister;l:tasmlabel);
  begin
    if(a=0)
    then
      list.concat(taicpu.op_reg_reg(A_CMP,reg,reg))
    else
      list.concat(taicpu.op_reg_const(A_CMP,reg,a));
    a_jmp_cond(list,cmp_op,l);
  end;
procedure TCgSparc.a_cmp_const_ref_label(list:TAasmOutput;size:tcgsize;cmp_op:topcmp;a:aword;const ref:TReference;l:tasmlabel);
  var
    cReg,rReg:TRegister;
  begin
    with cg do
      begin
        cReg:=get_scratch_reg_int(List,size);
        rReg:=get_scratch_reg_int(List,size);
        a_load_const_reg(List,OS_32,a,cReg);
        a_load_ref_reg(List,OS_32,ref,rReg);
        List.Concat(taicpu.op_reg_reg(A_CMP,rReg,cReg));
        a_jmp_cond(list,cmp_op,l);
        free_scratch_reg(List,cReg);
        free_scratch_reg(List,rReg);
      end;
  end;

      procedure TCgSparc.a_cmp_reg_reg_label(list:TAasmOutput;size:tcgsize;cmp_op:topcmp;
        reg1,reg2:tregister;l:tasmlabel);

        begin
 {         if regsize(reg1) <> S_SW then
            internalerror(200109226);
          list.concat(taicpu.op_reg_reg(A_CMP,regsize(reg1),reg1,reg2));
          a_jmp_cond(list,cmp_op,l);}
        end;
procedure TCgSparc.a_cmp_ref_reg_label(list:TAasmOutput;size:tcgsize;cmp_op:topcmp;CONST ref:TReference;reg:tregister;l:tasmlabel);
  var
    TempReg:TRegister;
   begin
     TempReg:=cg.get_scratch_reg_int(List,size);
     a_load_ref_reg(list,OS_32,Ref,TempReg);
     list.concat(taicpu.op_reg_reg_reg(A_SUBcc,TempReg,Reg,CpuReg[R_G0]));
     a_jmp_cond(list,cmp_op,l);
     cg.free_scratch_reg(exprasmlist,TempReg);
   end;
procedure TCgSparc.a_jmp_cond(list:TAasmOutput;cond:TOpCmp;l:TAsmLabel);
  var
    ai:TAiCpu;
  begin
    ai:=TAiCpu.Op_sym(A_BA,S_NO,l);
    ai.SetCondition(TOpCmp2AsmCond[cond]);
    with List do
      begin
        Concat(ai);
        Concat(TAiCpu.Op_none(A_NOP));
      end;
  end;
procedure TCgSparc.a_jmp_flags(list:TAasmOutput;CONST f:TResFlags;l:tasmlabel);
  var
    ai:taicpu;
  begin
    ai := Taicpu.op_sym(A_BA,S_NO,l);
    ai.SetCondition(flags_to_cond(f));
    with List do
      begin
        Concat(ai);
        Concat(TAiCpu.Op_none(A_NOP));
      end;
  end;
procedure TCgSparc.g_flags2reg(list:TAasmOutput;Size:TCgSize;CONST f:tresflags;reg:TRegister);
  VAR
    ai:taicpu;
    r,hreg:tregister;

  BEGIN
    r.enum:=R_PSR;
    hreg := rg.makeregsize(reg,OS_8);
    ai:=Taicpu.Op_reg_reg(A_RDPSR,r,hreg);
    ai.SetCondition(flags_to_cond(f));
    with List do
      begin
        Concat(ai);
        Concat(TAiCpu.Op_none(A_NOP));
      end;
    IF hreg.enum<>reg.enum
    THEN
      a_load_reg_reg(list,OS_32,OS_32,hreg,reg);
  END;
procedure TCgSparc.g_overflowCheck(List:TAasmOutput;const p:TNode);
  var
    hl:TAsmLabel;
    r:Tregister;
  begin
    r.enum:=R_NONE;
    if not(cs_check_overflow in aktlocalswitches)
    then
      exit;
    objectlibrary.getlabel(hl);
    if not((p.resulttype.def.deftype=pointerdef) or
       ((p.resulttype.def.deftype=orddef) and
        (torddef(p.resulttype.def).typ in [u64bit,u16bit,u32bit,u8bit,uchar,
                                         bool8bit,bool16bit,bool32bit])))
    then
      begin
        list.concat(taicpu.op_reg(A_NONE,r));
        a_jmp_always(list,hl)
      end
    else
      a_jmp_cond(list,OC_NONE,hl);
      a_call_name(list,'FPC_OVERFLOW');
      a_label(list,hl);
    end;

{ *********** entry/exit code and address loading ************ }

procedure TCgSparc.g_stackframe_entry(list:TAasmOutput;LocalSize:LongInt);
  var
    r : tregister;
  begin
    { Althogh the SPARC architecture require only word alignment, software
      convention and the operating system require every stack frame to be double word
      aligned }
    LocalSize:=align(LocalSize,8);
    { Execute the SAVE instruction to get a new register window and create a new
      stack frame. In the "SAVE %i6,size,%i6" the first %i6 is related to the state
      before execution of the SAVE instrucion so it is the caller %i6, when the %i6
      after execution of that instruction is the called function stack pointer}
    r.enum:=R_INTREGISTER;
    r.number:=NR_STACK_POINTER_REG;
    list.concat(Taicpu.Op_reg_const_reg(A_SAVE,r,-LocalSize,r));
  end;


procedure TCgSparc.g_restore_all_registers(list:TaasmOutput;accused,acchiused:boolean);
  begin
    { The sparc port uses the sparc standard calling convetions so this function has no used }
  end;


procedure TCgSparc.g_restore_frame_pointer(list:TAasmOutput);
  begin
     { This function intontionally does nothing as frame pointer is restored in the
       delay slot of the return instrucion done in g_return_from_proc}
  end;


procedure TCgSparc.g_restore_standard_registers(list:taasmoutput;usedinproc:Tsupregset);
  begin
    { The sparc port uses the sparc standard calling convetions so this function has no used }
  end;


procedure TCgSparc.g_return_from_proc(list:TAasmOutput;parasize:aword);
  var
    r,r2:Tregister;
  begin
    { According to the SPARC ABI, the stack is cleared using the RESTORE instruction
      which is genereted in the g_restore_frame_pointer. Notice that SPARC has no
      RETURN instruction and that JMPL is used instead. The JMPL instrucion have one
      delay slot, so an inversion is possible such as
      JMPL  %i7+8,%g0
      RESTORE  %g0,0,%g0
      If no inversion we can use just
      RESTORE  %g0,0,%g0
      JMPL  %i7+8,%g0
      NOP
    }
    with list do
      begin
        { Return address is computed by adding 8 to the CALL address saved onto %i6}
        r.enum:=R_G0;
        r2.enum:=R_I7;
        concat(Taicpu.Op_caddr_reg(A_JMPL,r,8,r));
        { We use trivial restore in the delay slot of the JMPL instruction, as we
          already set result onto %i0 }
        concat(Taicpu.Op_reg_const_reg(A_RESTORE,r,0,r));
     end
  end;


procedure TCgSparc.g_save_all_registers(list : taasmoutput);
  begin
    { The sparc port uses the sparc standard calling convetions so this function has no used }
  end;


procedure TCgSparc.g_save_standard_registers(list : taasmoutput; usedinproc:Tsupregset);
  begin
    { The sparc port uses the sparc standard calling convetions so this function has no used }
  end;


procedure TCgSparc.a_loadaddr_ref_reg(list:TAasmOutput;CONST ref:TReference;r:tregister);

       begin
//         list.concat(taicpu.op_ref_reg(A_LEA,S_SW,ref,r));
       end;
{ ************* 64bit operations ************ }
    procedure TCg64Sparc.get_64bit_ops(op:TOpCG;var op1,op2:TAsmOp);
      begin
        case op of
          OP_ADD :
            begin
              op1:=A_ADD;
              op2:=A_ADD;
            end;
          OP_SUB :
            begin
              op1:=A_SUB;
              op2:=A_SUB;
            end;
          OP_XOR :
            begin
              op1:=A_XOR;
              op2:=A_XOR;
            end;
          OP_OR :
            begin
              op1:=A_OR;
              op2:=A_OR;
            end;
          OP_AND :
            begin
              op1:=A_AND;
              op2:=A_AND;
            end;
          else
            internalerror(200203241);
        end;
      end;


    procedure TCg64Sparc.a_op64_ref_reg(list:TAasmOutput;op:TOpCG;CONST ref:TReference;reg:TRegister64);
      var
        op1,op2:TAsmOp;
        tempref:TReference;
      begin
        get_64bit_ops(op,op1,op2);
        list.concat(taicpu.op_ref_reg(op1,ref,reg.reglo));
        tempref:=ref;
        inc(tempref.offset,4);
        list.concat(taicpu.op_ref_reg(op2,tempref,reg.reghi));
      end;


    procedure TCg64Sparc.a_op64_reg_reg(list:TAasmOutput;op:TOpCG;regsrc,regdst:TRegister64);
      var
        op1,op2:TAsmOp;
      begin
        get_64bit_ops(op,op1,op2);
        list.concat(taicpu.op_reg_reg(op1,regsrc.reglo,regdst.reglo));
        list.concat(taicpu.op_reg_reg(op2,regsrc.reghi,regdst.reghi));
      end;


    procedure TCg64Sparc.a_op64_const_reg(list:TAasmOutput;op:TOpCG;value:qWord;regdst:TRegister64);
      var
        op1,op2:TAsmOp;
      begin
        case op of
          OP_AND,OP_OR,OP_XOR:
            WITH cg DO
              begin
                a_op_const_reg(list,op,Lo(Value),regdst.reglo);
                a_op_const_reg(list,op,Hi(Value),regdst.reghi);
              end;
          OP_ADD, OP_SUB:
            begin
              {can't use a_op_const_ref because this may use dec/inc}
              get_64bit_ops(op,op1,op2);
              list.concat(taicpu.op_const_reg(op1,Lo(Value),regdst.reglo));
              list.concat(taicpu.op_const_reg(op2,Hi(Value),regdst.reghi));
            end;
          else
            internalerror(200204021);
        end;
      end;


procedure TCg64Sparc.a_op64_const_ref(list:TAasmOutput;op:TOpCG;value:qWord;const ref:TReference);
  var
    op1,op2:TAsmOp;
    tempref:TReference;
  begin
    case op of
      OP_AND,OP_OR,OP_XOR:
      with cg do
        begin
          a_op_const_ref(list,op,OS_32,Lo(Value),ref);
          tempref:=ref;
          inc(tempref.offset,4);
          a_op_const_ref(list,op,OS_32,Hi(Value),tempref);
        end;
      OP_ADD, OP_SUB:
            begin
              get_64bit_ops(op,op1,op2);
              { can't use a_op_const_ref because this may use dec/inc}
{              list.concat(taicpu.op_const_ref(op1,Lo(Value),ref));
              tempref:=ref;
              inc(tempref.offset,4);
              list.concat(taicpu.op_const_ref(op2,S_SW,Hi(Value),tempref));}
              InternalError(2002102101);
            end;
          else
            internalerror(200204022);
        end;
      end;


{ ************* concatcopy ************ }
procedure TCgSparc.g_concatcopy(list:taasmoutput;const source,dest:treference;len:aword;delsource,loadref:boolean);
  var
    countreg: TRegister;
    src, dst: TReference;
    lab: tasmlabel;
    count, count2: aword;
    orgsrc, orgdst: boolean;
    r:Tregister;
  begin
{$ifdef extdebug}
    if len > high(longint)
    then
      internalerror(2002072704);
{$endif extdebug}
   { make sure short loads are handled as optimally as possible }
    if not loadref
    then
      if(len <= 8)and(byte(len) in [1,2,4,8])
      then
        begin
          if len < 8
          then
            begin
              a_load_ref_ref(list,int_cgsize(len),source,dest);
              if delsource
              then
                reference_release(list,source);
            end
          else
            begin
              r.enum:=R_F0;
              a_reg_alloc(list,r);
              a_loadfpu_ref_reg(list,OS_F64,source,r);
            if delsource
            then
              reference_release(list,source);
              a_loadfpu_reg_ref(list,OS_F64,r,dest);
              a_reg_dealloc(list,r);
            end;
          exit;
        end;
      reference_reset(src);
      reference_reset(dst);
      { load the address of source into src.base }
      if loadref
      then
        begin
          src.base := get_scratch_reg_address(list);
          a_load_ref_reg(list,OS_32,source,src.base);
          orgsrc := false;
        end
      else if not issimpleref(source) or
        ((source.index.enum<>R_NO)and
        ((source.offset+longint(len))>high(smallint)))
      then
        begin
          src.base := get_scratch_reg_address(list);
          a_loadaddr_ref_reg(list,source,src.base);
          orgsrc := false;
        end
      else
        begin
          src := source;
          orgsrc := true;
        end;
      if not orgsrc and delsource
      then
        reference_release(list,source);
        { load the address of dest into dst.base }
      if not issimpleref(dest) or
        ((dest.index.enum <> R_NO) and
        ((dest.offset + longint(len)) > high(smallint)))
      then
        begin
          dst.base := get_scratch_reg_address(list);
          a_loadaddr_ref_reg(list,dest,dst.base);
          orgdst := false;
        end
      else
        begin
          dst := dest;
          orgdst := true;
        end;
      count:=len and 7;{count:=len div 8}
      if count>4
      then
        { generate a loop }
        begin
          { the offsets are zero after the a_loadaddress_ref_reg and just }
          { have to be set to 8. I put an Inc there so debugging may be   }
          { easier (should offset be different from zero here, it will be }
          { easy to notice in the generated assembler                     }
          inc(dst.offset,8);
          inc(src.offset,8);
          list.concat(taicpu.op_reg_const_reg(A_SUB,src.base,8,src.base));
          list.concat(taicpu.op_reg_const_reg(A_SUB,dst.base,8,dst.base));
          countreg := get_scratch_reg_int(list,OS_32);
          a_load_const_reg(list,OS_32,count,countreg);
          { explicitely allocate R_O0 since it can be used safely here }
          { (for holding date that's being copied)                    }
          r.enum:=R_F0;
          a_reg_alloc(list,r);
          objectlibrary.getlabel(lab);
          a_label(list, lab);
          list.concat(taicpu.op_reg_const_reg(A_SUB,countreg,1,countreg));
          list.concat(taicpu.op_ref_reg(A_LDF,src,r));
          list.concat(taicpu.op_reg_ref(A_STD,r,dst));
          //a_jmp(list,A_BC,C_NE,0,lab);
          free_scratch_reg(list,countreg);
          a_reg_dealloc(list,r);
          len := len mod 8;
        end;
        count:=len and 7;
        if count>0
        then
          { unrolled loop }
          begin
            r.enum:=R_F0;
            a_reg_alloc(list,r);
            for count2 := 1 to count do
              begin
                a_loadfpu_ref_reg(list,OS_F64,src,r);
                a_loadfpu_reg_ref(list,OS_F64,r,dst);
                inc(src.offset,8);
                inc(dst.offset,8);
              end;
            a_reg_dealloc(list,r);
            len := len mod 8;
          end;

        if (len and 4) <> 0 then
          begin
            r.enum:=R_O0;
            a_reg_alloc(list,r);
            a_load_ref_reg(list,OS_32,src,r);
            a_load_reg_ref(list,OS_32,r,dst);
            inc(src.offset,4);
            inc(dst.offset,4);
            a_reg_dealloc(list,r);
          end;
       { copy the leftovers }
       if (len and 2) <> 0 then
         begin
           r.enum:=R_O0;
           a_reg_alloc(list,r);
           a_load_ref_reg(list,OS_16,src,r);
           a_load_reg_ref(list,OS_16,r,dst);
           inc(src.offset,2);
           inc(dst.offset,2);
           a_reg_dealloc(list,r);
         end;
       if (len and 1) <> 0 then
         begin
           r.enum:=R_O0;
           a_reg_alloc(list,r);
           a_load_ref_reg(list,OS_8,src,r);
           a_load_reg_ref(list,OS_8,r,dst);
           a_reg_dealloc(list,r);
         end;
       if orgsrc then
         begin
           if delsource then
             reference_release(list,source);
         end
       else
         free_scratch_reg(list,src.base);
       if not orgdst then
         free_scratch_reg(list,dst.base);
      end;
function TCgSparc.reg_cgsize(CONST reg:tregister):tcgsize;
  begin
    result:=OS_32;
  end;


{***************** This is private property, keep out! :) *****************}
function TCgSparc.IsSimpleRef(const ref:treference):boolean;
  begin
    if(ref.base.enum=R_NONE)and(ref.index.enum <> R_NO)
    then
      InternalError(2002100804);
    result :=not(assigned(ref.symbol))and
              (((ref.index.enum = R_NO) and
               (ref.offset >= low(smallint)) and
                (ref.offset <= high(smallint))) or
              ((ref.index.enum <> R_NO) and
              (ref.offset = 0)));
  end;
procedure TCgSparc.sizes2load(s1:tcgsize;s2:topsize;var op:tasmop;var s3:topsize);
  begin
    case s2 of
      S_B:
        if S1 in [OS_8,OS_S8]
        then
          s3 := S_B
        else
          internalerror(200109221);
      S_W:
        case s1 of
          OS_8,OS_S8:
            s3 := S_B;
          OS_16,OS_S16:
            s3 := S_H;
        else
          internalerror(200109222);
        end;
      S_SW:
        case s1 of
          OS_8,OS_S8:
            s3 := S_B;
          OS_16,OS_S16:
            s3 := S_H;
          OS_32,OS_S32:
            s3 := S_W;
          else
            internalerror(200109223);
        end;
      else internalerror(200109227);
    end;
    if s3 in [S_B,S_W,S_SW]
    then
      op := A_LD
{    else if s3=S_DW
    then
      op:=A_LDD
    else if s3 in [OS_8,OS_16,OS_32]
    then
      op := A_NONE}
    else
      op := A_NONE;
  end;
procedure TCgSparc.floatloadops(t:tcgsize;VAR op:tasmop;VAR s:topsize);
  BEGIN
(*         case t of
            OS_F32:begin
                        op:=A_FLD;
                        s:=S_FS;
                     end;
            OS_F64:begin
                        op:=A_FLD;
                        { ???? }
                        s:=S_FL;
                     end;
            OS_F80:begin
                        op:=A_FLD;
                        s:=S_FX;
                     end;
            OS_C64:begin
                        op:=A_FILD;
                        s:=S_IQ;
                     end;
            else internalerror(17);
         end;*)
  END;
procedure TCgSparc.floatload(list:TAasmOutput;t:tcgsize;CONST ref:TReference);
  VAR
    op:tasmop;
    s:topsize;
  BEGIN
    floatloadops(t,op,s);
    list.concat(Taicpu.Op_ref(op,ref));
{    inc(trgcpu(rg).fpuvaroffset);}
  END;
procedure TCgSparc.floatstoreops(t:tcgsize;var op:tasmop;var s:topsize);
  BEGIN
{         case t of
            OS_F32:begin
                        op:=A_FSTP;
                        s:=S_FS;
                     end;
            OS_F64:begin
                        op:=A_FSTP;
                        s:=S_FL;
                     end;
            OS_F80:begin
                        op:=A_FSTP;
                        s:=S_FX;
                     end;
            OS_C64:begin
                        op:=A_FISTP;
                        s:=S_IQ;
                     end;
         else
           internalerror(17);
         end;}
      end;
procedure TCgSparc.floatstore(list:TAasmOutput;t:tcgsize;CONST ref:TReference);
  VAR
    op:tasmop;
    s:topsize;
  BEGIN
    floatstoreops(t,op,s);
    list.concat(Taicpu.Op_ref(op,ref));
{    dec(trgcpu(rg).fpuvaroffset);}
  END;
BEGIN
  cg:=TCgSparc.Create;
  cg64:=TCg64Sparc.Create;
END.
{
  $Log$
  Revision 1.50  2003-05-23 22:33:48  florian
    * fix some small flaws which prevent sparc linux system unit from compiling
    * some reformatting done

  Revision 1.49  2003/05/22 16:11:22  florian
    * fixed sparc compilation partially

  Revision 1.48  2003/05/07 15:04:30  mazen
  * invalid genrated code for CASE statement fixed

  Revision 1.47  2003/05/06 20:25:20  mazen
  * Invalid genrated code : A_JMPL changed to A_BA

  Revision 1.46  2003/05/06 15:02:40  mazen
  * fixed a bug in a_load_const_reg related to max 13bit value limit
    for immediat value ==> use of A_SETHI for greater values

  Revision 1.45  2003/04/29 11:58:21  mazen
  * fixed bug of output generated assembler for a_cmp_const_ref_label

  Revision 1.44  2003/04/28 09:44:42  mazen
  + NOP after conditional jump instruction to prevent delay slot execution

  Revision 1.43  2003/04/27 11:21:36  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 1.42  2003/03/16 20:45:45  mazen
  * fixing an LD operation without refernce in loading address parameters

  Revision 1.41  2003/03/10 21:59:54  mazen
  * fixing index overflow in handling new registers arrays.

  Revision 1.40  2003/02/25 21:41:44  mazen
  * code re-aligned 2 spaces

  Revision 1.39  2003/02/19 22:00:16  daniel
    * Code generator converted to new register notation
    - Horribily outdated todo.txt removed

  Revision 1.38  2003/02/18 22:00:20  mazen
  * asm condition generation modified by TAiCpu.SetCondition

  Revision 1.37  2003/02/05 21:48:34  mazen
  * fixing run time errors related to unimplemented abstract methods in CG
  + giving empty emplementations for some RTL functions

  Revision 1.36  2003/01/22 22:30:03  mazen
  - internal errors rmoved from a_loar_reg_reg when reg sizes differs from 32

  Revision 1.35  2003/01/20 22:21:36  mazen
  * many stuff related to RTL fixed

  Revision 1.34  2003/01/08 18:43:58  daniel
   * Tregister changed into a record

  Revision 1.33  2003/01/07 22:03:40  mazen
  * adding unequaln node support to sparc compiler

  Revision 1.32  2003/01/06 22:51:47  mazen
  * fixing bugs related to load_reg_ref

  Revision 1.31  2003/01/05 21:32:35  mazen
  * fixing several bugs compiling the RTL

  Revision 1.30  2003/01/05 13:36:53  florian
    * x86-64 compiles
    + very basic support for float128 type (x86-64 only)

  Revision 1.29  2002/12/25 20:59:49  mazen
  - many emitXXX removed from cga.pas in order to remove that file.

  Revision 1.28  2002/12/22 19:26:31  mazen
  * many internal errors related to unimplemented nodes are fixed

  Revision 1.27  2002/12/21 23:21:47  mazen
  + added support for the shift nodes
  + added debug output on screen with -an command line option

  Revision 1.26  2002/11/25 19:21:49  mazen
  * fixed support of nSparcInline

  Revision 1.25  2002/11/25 17:43:28  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 1.24  2002/11/17 17:49:09  mazen
  + return_result_reg and function_result_reg are now used, in all plateforms, to pass functions result between called function and its caller. See the explanation of each one

  Revision 1.23  2002/11/10 19:07:46  mazen
  * SPARC calling mechanism almost OK (as in GCC./mppcsparc )

  Revision 1.22  2002/11/06 11:31:24  mazen
  * op_reg_reg_reg don't need any more a TOpSize parameter

  Revision 1.21  2002/11/05 16:15:00  mazen
  *** empty log message ***

  Revision 1.20  2002/11/03 20:22:40  mazen
  * parameter handling updated

  Revision 1.19  2002/10/28 20:59:17  mazen
  * TOpSize values changed S_L --> S_SW

  Revision 1.18  2002/10/22 13:43:01  mazen
  - cga.pas redueced to an empty unit

  Revision 1.17  2002/10/20 19:01:38  mazen
  + op_raddr_reg and op_caddr_reg added to fix functions prologue

  Revision 1.16  2002/10/13 21:46:07  mazen
  * assembler output format fixed

  Revision 1.15  2002/10/11 13:35:14  mazen
  *** empty log message ***

  Revision 1.14  2002/10/10 19:57:51  mazen
  * Just to update repsitory

  Revision 1.13  2002/10/10 15:10:39  mazen
  * Internal error fixed, but usually i386 parameter model used

  Revision 1.12  2002/10/08 17:17:03  mazen
  *** empty log message ***

  Revision 1.11  2002/10/07 20:33:04  mazen
  word alignement modified in g_stack_frame

  Revision 1.10  2002/10/04 21:57:42  mazen
  * register allocation for parameters now done in cpupara, but InternalError(200109223) in cgcpu.pas:1053 is still not fixed du to location_force problem in ncgutils.pas:419

  Revision 1.9  2002/10/02 22:20:28  mazen
  + out registers allocator for the first 6 scalar parameters which must be passed into %o0..%o5

  Revision 1.8  2002/10/01 21:35:58  mazen
  + procedures exiting prologue added and stack frame now restored in the delay slot of the return (JMPL) instruction

  Revision 1.7  2002/10/01 21:06:29  mazen
  attinst.inc --> strinst.inc

  Revision 1.6  2002/10/01 17:41:50  florian
    * fixed log and id
}