{
    $Id: cpubase.pas,v 1.6 2002/11/17 18:26:16 mazen Exp $
    Copyright (C) 2000 by Florian Klaempfl

    this unit implements an asmlistitem class for the iA-64 architecture

    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 cpubase;

  interface

    uses
       cutils,strings,systems,cobjects,globals,aasm,cpuinfo;

type
  tasmop = (A_ADD,A_SUB,A_ADDP4,A_AND,A_ANDCM,A_OR,A_XOR,A_SHLADD,
            A_SHLADDP4,A_ADDS,A_ADDL,A_CMP,A_CMP4,A_PADD1,A_PADD2,
            A_PADD4,A_PSUB1,A_PSUB2,A_PSUB4,A_PAVG1,A_PAVG2,A_PAVGSUB1,
            A_PAVGSUB2,A_PCMP1,A_PCMP2,A_PCMP4,A_PSHLADD2,A_PSHRADD2,
            A_PMPY2,A_MIX1,A_MIX2,A_MIX4,A_PACK2,A_PACK4,A_UNPACK2,
            A_UNPACK4,A_PMIN1,A_PMAX1,A_PMIN2,A_PMAX2,A_PSAD1,A_MUX1,
            A_MUX2,A_PSHR2,A_PSHR4,A_SHR,A_PSHL2,A_SHL4,A_SHL,
            A_POPCNT,A_SHRP,A_EXTR,A_DEP,A_TBIT,A_TNAT,A_BREAK,
            A_NOP,A_CHK,A_MOV,A_ZX1,A_ZX2,A_ZXT4,A_SXT1,A_SXT2,A_SXT4,
            A_CXZ1,A_CZX2,A_LD1,A_LD2,A_LD4,A_LD8,A_ST1,A_ST2,A_ST4,
            A_ST8,A_LDFS,A_LDFD,A_LDF8,A_LDFE,A_LDF,A_STFS,A_STFD,A_STF8,
            A_STFE,A_STF,A_LDFPS,A_LDFPD,A_LDFP8,A_LFETCH,A_CMPXCHG1,
            A_CMPXCHG2,A_CMPXHG4,A_CMPXCHG8,A_XCHG1,A_XCHG2,A_XCHG4,
            A_XCHG8,A_FETCHADD4,A_FETCHADD8,A_SETF,A_GETF,
            A_INVALA,A_MF,A_SRLZ,A_SYNC,A_FLUSHRS,A_FC,A_ALLOC,A_SUM,
            A_RUM,A_BR,A_CLRRRB,A_FMA,A_FPMA,A_FMS,A_FPMS,A_FNMA,A_FPNMA,
            A_XMA,A_FSELECT,A_FCLASS,A_FRCPA,A_FPRCPA,A_FRSQRTA,
            A_FPRSQRTA,A_FMIN,A_FMAX,A_FAMIN,A_FAMAX,A_FPMIN,A_FPMAX,
            A_FPAMIN,A_FPAMAX,A_FPCMP,A_FMERGE,A_FMIX,A_FSXT,A_FPACK,
            A_FSWAP,A_FAND,A_FANDCM,A_FOR,A_FXOR,A_FPMERGE,A_FCVT,
            A_FPCVT,A_FSETC,A_FCLRT,A_FCHKF,A_MOVL);

Const
  firstop = low(tasmop);
  lastop  = high(tasmop);

type
  TAsmCond = (C_NONE,C_LT,C_LTU,C_EQ,C_LT_UNC,C_LTU_UNC,C_EQ_UNC,
              C_EQ_AND,C_EQ_OR,C_EQ_OR_ANDCM,C_NE_AND,C_NE_OR);

  THint = (H_NONE,H_NT1,H_NT2,H_NTA);
  TLdStType = (LST_NONE,LST_S,LST_A,LSR_SA,LST_BIAS,LST_ACQ,LST_C_CLR,
               LST_FILL,LST_C_NC,LST_C_CLR_ACQ,LST_REL,
               LST_SPILL);

Type
 TRegister = (R_NO,  { R_NO is Mandatory, signifies no register }
              R_0,R_1,R_2,R_3,R_4,R_5,R_6,R_7,R_8,R_9,
              R_10,R_11,R_12,R_13,R_14,R_15,R_16,R_17,R_18,R_19,
              R_20,R_21,R_22,R_23,R_24,R_25,R_26,R_27,R_28,R_29,
              R_30,R_31,
              R_F0,R_F1,R_F2,R_F3,R_F4,R_F5,R_F6,R_F7,R_F8,R_F9,
              R_F10,R_F11,R_F12,R_F13,R_F14,R_F15,R_F16,R_F17,R_F18,R_F19,
              R_F20,R_F21,R_F22,R_F23,R_F24,R_F25,R_F26,R_F27,R_F28,R_F29,
              R_F30,R_F31);

  TRegisterset = Set of TRegister;

  { -1 indicates no qualifying prediction }
  tqp = -1..63;

const
  qp_none : tqp = -1;

{ Constants describing the registers }

Const
  Firstreg = R_0;
  LastReg = R_F31;

  stack_pointer_reg = R_30;
  frame_pointer_reg = R_15;
  self_pointer_reg  = R_16;
  accumulator   = R_0;
  {the return_result_reg, is used inside the called function to store its return
  value when that is a scalar value otherwise a pointer to the address of the
  result is placed inside it}
	return_result_reg		=	accumulator;

  {the function_result_reg contains the function result after a call to a scalar
  function othewise it contains a pointer to the returned result}
	function_result_reg	=	accumulator;
  global_pointer = R_29;
  return_pointer = R_26;

  max_scratch_regs = 2;
  scratch_regs : array[1..max_scratch_regs] of tregister = (R_1,R_2);

{ low and high of the available maximum width integer general purpose }
{ registers                                                           }
  LoGPReg = R_0;
  HiGPReg = R_31;

  { sizes }
  pointer_size  = 8;
  extended_size = 16;

  general_registers = [R_0..R_31];

  intregs = [R_0..R_31];
  fpuregs = [R_F0..R_F31];
  mmregs = [];

  availabletempregsint = [R_0..R_14,R_16..R_25,R_28];
  availabletempregsfpu = [R_F0..R_F30];
  availabletempregsmm  = [];

  c_countusableregsint = 26;
  c_countusableregsfpu = 31;
  c_countusableregsmm  = 0;

  maxfpuvarregs = 128;
  maxvarregs = 128;

  max_operands = 4;

  varregs : Array [1..6] of Tregister =
            (R_9,R_10,R_11,R_12,R_13,R_14);

{*****************************************************************************
                       GCC /ABI linking information
*****************************************************************************}

  {# Registers which must be saved when calling a routine declared as
     cppdecl, cdecl, stdcall, safecall, palmossyscall. The registers
     saved should be the ones as defined in the target ABI and / or GCC.

     This value can be deduced from CALLED_USED_REGISTERS array in the
     GCC source.
  }
  std_saved_registers = [R_9..R_14,R_F2..R_F9];
  {# Required parameter alignment when calling a routine declared as
     stdcall and cdecl. The alignment value should be the one defined
     by GCC or the target ABI.

     The value of this constant is equal to the constant
     PARM_BOUNDARY / BITS_PER_UNIT in the GCC source.
  }
  std_param_align = ???;


Type
   TReference = record
      offset : aword;
      symbol : pasmsymbol;
      base : tregister;
      is_immediate : boolean;
      offsetfixup : word; {needed for inline}
      { the boundary to which the reference is surely aligned }
      alignment : byte;
   end;
   PReference = ^TReference;

   tloc = (LOC_INVALID,
           LOC_REGISTER,
           LOC_FPU,
           LOC_MEM,
           LOC_REFERENCE,
           LOC_JUMP,
           { the alpha doesn't have flags, but this }
           { avoid some conditional compiling       }
           { DON'T USE for the alpha                }
           LOC_FLAGS,
           LOC_CREGISTER,
           LOC_CFPUREGISTER,
           LOC_CONST);

   tlocation = record
   case loc : tloc of
     LOC_REFERENCE,LOC_MEM : (reference : treference);
     LOC_CREGISTER,
     LOC_REGISTER : (register : tregister);
     LOC_FLAGS : (qp : tqp);
     LOC_JUMP : ();
   end;

{*****************************************************************************
                   Opcode propeties (needed for optimizer)
*****************************************************************************}

{$ifndef NOOPT}
Type
{What an instruction can change}
  TInsChange = (Ch_None);
{$endif}


  { resets all values of ref to defaults }
  procedure reset_reference(var ref : treference);
  { set mostly used values of a new reference }
  function new_reference(base : tregister;offset : longint) : preference;
  function newreference(const r : treference) : preference;
  procedure disposereference(var r : preference);

  procedure set_location(var destloc : tlocation;const sourceloc : tlocation);


{*****************************************************************************
                                  Init/Done
*****************************************************************************}

  procedure InitCpu;
  procedure DoneCpu;

implementation

  uses
     verbose;


  procedure reset_reference(var ref : treference);
  begin
    FillChar(ref,sizeof(treference),0);
  end;


  function new_reference(base : tregister;offset : longint) : preference;
  var
    r : preference;
  begin
    new(r);
    FillChar(r^,sizeof(treference),0);
    r^.offset:=offset;
    r^.alignment:=8;
    new_reference:=r;
  end;

  function newreference(const r : treference) : preference;

  var
     p : preference;
  begin
     new(p);
     p^:=r;
     newreference:=p;
  end;

  procedure disposereference(var r : preference);

  begin
    dispose(r);
    r:=Nil;
  end;

  procedure set_location(var destloc : tlocation;const sourceloc : tlocation);

    begin
       destloc:=sourceloc;
    end;

{*****************************************************************************
                                  Init/Done
*****************************************************************************}

  procedure InitCpu;
    begin
    end;

  procedure DoneCpu;
    begin
    end;

end.
{
  $Log: cpubase.pas,v $
  Revision 1.6  2002/11/17 18:26:16  mazen
  * fixed a compilation bug accmulator-->accumulator, in definition of return_result_reg

  Revision 1.5  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 1.4  2002/09/07 15:25:11  peter
    * old logs removed and tabs fixed

  Revision 1.3  2002/04/20 21:38:45  carl
  * renamed some constants

}
