fpc/compiler/x86/cpubase.pas

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

    Contains the base types for the i386 and x86-64 architecture

    * This code was inspired by the NASM sources
      The Netwide Assembler is Copyright (c) 1996 Simon Tatham and
      Julian Hall. All rights reserved.

    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.

 ****************************************************************************
}
{# Base unit for processor information. This unit contains
   enumerations of registers, opcodes, sizes, and other
   such things which are processor specific.
}
unit cpubase;

{$i fpcdefs.inc}

interface

uses
  cutils,cclasses,
  globtype,globals,
  cpuinfo,
  aasmbase,
  cginfo
{$ifdef delphi}
  ,dmisc
{$endif}
  ;


{*****************************************************************************
                                Assembler Opcodes
*****************************************************************************}

    type
{$ifdef x86_64}
      TAsmOp={$i x86_64op.inc}
{$else x86_64}
      TAsmOp={$i i386op.inc}
{$endif x86_64}

      {# This should define the array of instructions as string }
      op2strtable=array[tasmop] of string[11];

    const
      {# First value of opcode enumeration }
      firstop = low(tasmop);
      {# Last value of opcode enumeration  }
      lastop  = high(tasmop);

{*****************************************************************************
                                  Registers
*****************************************************************************}

   type
      { don't change the order }
      { it's used by the register size conversions }
      { Enumeration of all registers of the CPU }
      toldregister = (R_NO,
{$ifdef x86_64}
        R_RAX,R_RCX,R_RDX,R_RBX,R_RSP,R_RBP,R_RSI,R_RDI,
        R_R8,R_R9,R_R10,R_R11,R_R12,R_R13,R_R14,R_R15,R_RIP,
{$endif x86_64}
        R_EAX,R_ECX,R_EDX,R_EBX,R_ESP,R_EBP,R_ESI,R_EDI,
{$ifdef x86_64}
        R_R8D,R_R9D,R_R10D,R_R11D,R_R12D,R_R13D,R_R14D,R_R15D,
{$endif x86_64}
        R_AX,R_CX,R_DX,R_BX,R_SP,R_BP,R_SI,R_DI,
{$ifdef x86_64}
        R_R8W,R_R9W,R_R10W,R_R11W,R_R12W,R_R13W,R_R14W,R_R15W,
{$endif x86_64}
        R_AL,R_CL,R_DL,R_BL,
{$ifdef x86_64}
        R_SPL,R_BPL,R_SIL,R_DIL,
        R_R8B,R_R9B,R_R10B,R_R11B,R_R12B,R_R13B,R_R14B,R_R15B,
{$endif x86_64}
        R_AH,R_CH,R_BH,R_DH,
        R_CS,R_DS,R_ES,R_SS,R_FS,R_GS,
        R_ST,R_ST0,R_ST1,R_ST2,R_ST3,R_ST4,R_ST5,R_ST6,R_ST7,
        R_DR0,R_DR1,R_DR2,R_DR3,R_DR6,R_DR7,
        R_CR0,R_CR2,R_CR3,R_CR4,
        R_TR3,R_TR4,R_TR5,R_TR6,R_TR7,
        R_MM0,R_MM1,R_MM2,R_MM3,R_MM4,R_MM5,R_MM6,R_MM7,
        R_XMM0,R_XMM1,R_XMM2,R_XMM3,R_XMM4,R_XMM5,R_XMM6,R_XMM7,
{$ifdef x86_64}
        R_XMM8,R_XMM9,R_XMM10,R_XMM11,R_XMM12,R_XMM13,R_XMM14,R_XMM15,
{$endif x86_64}
        R_INTREGISTER,R_FLOATREGISTER,R_MMXREGISTER,R_KNIREGISTER
      );

      { The new register coding:

        For now we'll use this, when the old register coding is away, we
        can change this into a cardinal or something so the amount of
        possible registers increases.

        High byte: Register number
        Low byte:  Subregister

        Example:

        $0100      AL
        $0101      AH
        $0102      AX
        $0103      EAX
        $0104      RAX
        $0201      BL
        $0203      EBX
      }

      {Super register numbers:}
   const
{$ifdef x86_64}
      RS_SPECIAL    = $00;      {Special register}
      RS_RAX        = $01;      {EAX}
      RS_RBX        = $02;      {EBX}
      RS_RCX        = $03;      {ECX}
      RS_RDX        = $04;      {EDX}
      RS_RSI        = $05;      {ESI}
      RS_RDI        = $06;      {EDI}
      RS_RBP        = $07;      {EBP}
      RS_RSP        = $08;      {ESP}
      RS_R8         = $09;      {R8}
      RS_R9         = $0a;      {R9}
      RS_R10        = $0b;      {R10}
      RS_R11        = $0c;      {R11}
      RS_R12        = $0d;      {R12}
      RS_R13        = $0e;      {R13}
      RS_R14        = $0f;      {R14}
      RS_R15        = $10;      {R15}
      { create aliases to allow code sharing between x86-64 and i386 }
      RS_EAX        = RS_RAX;
      RS_EBX        = RS_RBX;
      RS_ECX        = RS_RCX;
      RS_EDX        = RS_RDX;
      RS_ESI        = RS_RSI;
      RS_EDI        = RS_RDI;
      RS_EBP        = RS_RBP;
      RS_ESP        = RS_RSP;
{$else x86_64}
      RS_SPECIAL    = $00;      {Special register}
      RS_EAX        = $01;      {EAX}
      RS_EBX        = $02;      {EBX}
      RS_ECX        = $03;      {ECX}
      RS_EDX        = $04;      {EDX}
      RS_ESI        = $05;      {ESI}
      RS_EDI        = $06;      {EDI}
      RS_EBP        = $07;      {EBP}
      RS_ESP        = $08;      {ESP}
{$endif x86_64}


      {Number of first and last superregister.}
      first_supreg    = $01;
{$ifdef x86_64}
      last_supreg     = $10;
{$else}
      last_supreg     = $08;
{$endif}
      {Number of first and last imaginary register.}
      first_imreg     = $12;
      last_imreg      = $ff;

      {Sub register numbers:}
      R_SUBL        = $00;      {Like AL}
      R_SUBH        = $01;      {Like AH}
      R_SUBW        = $02;      {Like AX}
      R_SUBD        = $03;      {Like EAX}
      R_SUBQ        = $04;      {Like RAX}

    {The subregister that specifies the entire register.}
{$ifdef x86_64}
      R_SUBWHOLE    = R_SUBQ; {Hammer}
{$else x86_64}
      R_SUBWHOLE    = R_SUBD;  {i386}
{$endif x86_64}

      { special registers }
      NR_NO    = $0000;      {Invalid register}
      NR_CS    = $0001;      {CS}
      NR_DS    = $0002;      {DS}
      NR_ES    = $0003;      {ES}
      NR_SS    = $0004;      {SS}
      NR_FS    = $0005;      {FS}
      NR_GS    = $0006;      {GS}
      NR_RIP   = $000F;      {RIP}
      NR_DR0   = $0010;      {DR0}
      NR_DR1   = $0011;      {DR1}
      NR_DR2   = $0012;      {DR2}
      NR_DR3   = $0013;      {DR3}
      NR_DR6   = $0016;      {DR6}
      NR_DR7   = $0017;      {DR7}
      NR_CR0   = $0020;      {CR0}
      NR_CR2   = $0021;      {CR1}
      NR_CR3   = $0022;      {CR2}
      NR_CR4   = $0023;      {CR3}
      NR_TR3   = $0030;      {R_TR3}
      NR_TR4   = $0031;      {R_TR4}
      NR_TR5   = $0032;      {R_TR5}
      NR_TR6   = $0033;      {R_TR6}
      NR_TR7   = $0034;      {R_TR7}

      { normal registers: }
      NR_AL    = $0100;      {AL}
      NR_AH    = $0101;      {AH}
      NR_AX    = $0102;      {AX}
      NR_EAX   = $0103;      {EAX}
      NR_RAX   = $0104;      {RAX}
      NR_BL    = $0200;      {BL}
      NR_BH    = $0201;      {BH}
      NR_BX    = $0202;      {BX}
      NR_EBX   = $0203;      {EBX}
      NR_RBX   = $0204;      {RBX}
      NR_CL    = $0300;      {CL}
      NR_CH    = $0301;      {CH}
      NR_CX    = $0302;      {CX}
      NR_ECX   = $0303;      {ECX}
      NR_RCX   = $0304;      {RCX}
      NR_DL    = $0400;      {DL}
      NR_DH    = $0401;      {DH}
      NR_DX    = $0402;      {DX}
      NR_EDX   = $0403;      {EDX}
      NR_RDX   = $0404;      {RDX}
      NR_SIL   = $0500;      {SIL}
      NR_SI    = $0502;      {SI}
      NR_ESI   = $0503;      {ESI}
      NR_RSI   = $0504;      {RSI}
      NR_DIL   = $0600;      {DIL}
      NR_DI    = $0602;      {DI}
      NR_EDI   = $0603;      {EDI}
      NR_RDI   = $0604;      {RDI}
      NR_BPL   = $0700;      {BPL}
      NR_BP    = $0702;      {BP}
      NR_EBP   = $0703;      {EBP}
      NR_RBP   = $0704;      {RBP}
      NR_SPL   = $0800;      {SPL}
      NR_SP    = $0802;      {SP}
      NR_ESP   = $0803;      {ESP}
      NR_RSP   = $0804;      {RSP}
      NR_R8L   = $0900;      {R8L}
      NR_R8W   = $0902;      {R8W}
      NR_R8D   = $0903;      {R8D}
      NR_R8    = $0904;      {R8}
      NR_R9L   = $0a00;      {R9D}
      NR_R9W   = $0a02;      {R9W}
      NR_R9D   = $0a03;      {R9D}
      NR_R9    = $0a04;      {R9}
      NR_R10L  = $0b00;      {R10L}
      NR_R10W  = $0b02;      {R10W}
      NR_R10D  = $0b03;      {R10D}
      NR_R10   = $0b04;      {R10}
      NR_R11L  = $0c00;      {R11L}
      NR_R11W  = $0c02;      {R11W}
      NR_R11D  = $0c03;      {R11D}
      NR_R11   = $0c04;      {R11}
      NR_R12L  = $0d00;      {R12L}
      NR_R12W  = $0d02;      {R12W}
      NR_R12D  = $0d03;      {R12D}
      NR_R12   = $0d04;      {R12}
      NR_R13L  = $0e00;      {R13L}
      NR_R13W  = $0e02;      {R13W}
      NR_R13D  = $0e03;      {R13D}
      NR_R13   = $0e04;      {R13}
      NR_R14L  = $0f00;      {R14L}
      NR_R14W  = $0f02;      {R14W}
      NR_R14D  = $0f03;      {R14D}
      NR_R14   = $0f04;      {R14}
      NR_R15L  = $1000;      {R15L}
      NR_R15W  = $1002;      {R15W}
      NR_R15D  = $1003;      {R15D}
      NR_R15   = $1004;      {R15}

   type
      tnewregister=word;

      Tregister = packed record
        enum:Toldregister;
        number:Tnewregister;  {This is a word for now, change to cardinal
                               when the old register coding is away.}
      end;

      Tsuperregister=byte;
      Tsubregister=byte;

      { A type to store register locations for 64 Bit values. }
{$ifdef x86_64}
      tregister64 = tregister;
{$else x86_64}
      tregister64 = packed record
         reglo,reghi : tregister;
      end;
{$endif x86_64}

      { alias for compact code }
      treg64 = tregister64;

      {# Set type definition for registers }
      tregisterset = set of toldregister;
      tsupregset = set of tsuperregister;


    const
      {# First register in the tregister enumeration }
      firstreg = low(toldregister);
{$ifdef x86_64}
      { Last register in the tregister enumeration }
      lastreg  = R_XMM15;
{$else x86_64}
      { Last register in the tregister enumeration }
      lastreg  = R_XMM7;
{$endif x86_64}

      firstsreg = R_CS;
      lastsreg  = R_GS;

      nfirstsreg = NR_CS;
      nlastsreg  = NR_GS;

      regset8bit  : tregisterset = [R_AL..R_DH];
      regset16bit : tregisterset = [R_AX..R_DI,R_CS..R_SS];
      regset32bit : tregisterset = [R_EAX..R_EDI];

    type
      {# Type definition for the array of string of register names }
         reg2strtable = array[firstreg..lastreg] of string[6];
         regname2regnumrec = record
           name:string[6];
           number:Tnewregister;
         end;

{*****************************************************************************
                                Conditions
*****************************************************************************}

    type
      TAsmCond=(C_None,
        C_A,C_AE,C_B,C_BE,C_C,C_E,C_G,C_GE,C_L,C_LE,C_NA,C_NAE,
        C_NB,C_NBE,C_NC,C_NE,C_NG,C_NGE,C_NL,C_NLE,C_NO,C_NP,
        C_NS,C_NZ,C_O,C_P,C_PE,C_PO,C_S,C_Z
      );

    const
      cond2str:array[TAsmCond] of string[3]=('',
        'a','ae','b','be','c','e','g','ge','l','le','na','nae',
        'nb','nbe','nc','ne','ng','nge','nl','nle','no','np',
        'ns','nz','o','p','pe','po','s','z'
      );

      inverse_cond:array[TAsmCond] of TAsmCond=(C_None,
        C_NA,C_NAE,C_NB,C_NBE,C_NC,C_NE,C_NG,C_NGE,C_NL,C_NLE,C_A,C_AE,
        C_B,C_BE,C_C,C_E,C_G,C_GE,C_L,C_LE,C_O,C_P,
        C_S,C_Z,C_NO,C_NP,C_NP,C_P,C_NS,C_NZ
      );

{*****************************************************************************
                                   Flags
*****************************************************************************}

    type
      TResFlags = (F_E,F_NE,F_G,F_L,F_GE,F_LE,F_C,F_NC,F_A,F_AE,F_B,F_BE);

{*****************************************************************************
                                Reference
*****************************************************************************}

    type
      trefoptions=(ref_none,ref_parafixup,ref_localfixup,ref_selffixup);

      { reference record }
      preference = ^treference;
      treference = packed record
         segment,
         base,
         index       : tregister;
         scalefactor : byte;
         offset      : longint;
         symbol      : tasmsymbol;
         offsetfixup : longint;
         options     : trefoptions;
      end;

      { reference record }
      pparareference = ^tparareference;
      tparareference = packed record
         index       : tregister;
         offset      : longint;
      end;

{*****************************************************************************
                                Operands
*****************************************************************************}

      { Types of operand }
      toptype=(top_none,top_reg,top_ref,top_const,top_symbol);

      toper=record
        ot  : longint;
        case typ : toptype of
         top_none   : ();
         top_reg    : (reg:tregister);
         top_ref    : (ref:preference);
         top_const  : (val:aword);
         top_symbol : (sym:tasmsymbol;symofs:longint);
      end;

{*****************************************************************************
                               Generic Location
*****************************************************************************}

    type
      { tparamlocation describes where a parameter for a procedure is stored.
        References are given from the caller's point of view. The usual
        TLocation isn't used, because contains a lot of unnessary fields.
      }
      tparalocation = packed record
         size : TCGSize;
         loc  : TCGLoc;
         sp_fixup : longint;
         case TCGLoc of
            LOC_REFERENCE : (reference : tparareference);
            { segment in reference at the same place as in loc_register }
            LOC_REGISTER,LOC_CREGISTER : (
              case longint of
                1 : (register,registerhigh : tregister);
                { overlay a registerlow }
                2 : (registerlow : tregister);
                { overlay a 64 Bit register type }
                3 : (reg64 : tregister64);
                4 : (register64 : tregister64);
              );
            { it's only for better handling }
            LOC_MMXREGISTER,LOC_CMMXREGISTER : (mmxreg : tregister);
      end;

      tlocation = packed record
         loc  : TCGLoc;
         size : TCGSize;
         case TCGLoc of
            LOC_FLAGS : (resflags : tresflags);
            LOC_CONSTANT : (
              case longint of
                1 : (value : AWord);
                { can't do this, this layout depends on the host cpu. Use }
                { lo(valueqword)/hi(valueqword) instead (JM)              }
                { 2 : (valuelow, valuehigh:AWord);                        }
                { overlay a complete 64 Bit value }
                3 : (valueqword : qword);
              );
            LOC_CREFERENCE,
            LOC_REFERENCE : (reference : treference);
            { segment in reference at the same place as in loc_register }
            LOC_REGISTER,LOC_CREGISTER : (
              case longint of
                1 : (register,registerhigh,segment : tregister);
                { overlay a registerlow }
                2 : (registerlow : tregister);
                { overlay a 64 Bit register type }
                3 : (reg64 : tregister64);
                4 : (register64 : tregister64);
              );
            { it's only for better handling }
            LOC_MMXREGISTER,LOC_CMMXREGISTER : (mmxreg : tregister);
      end;

{*****************************************************************************
                                 Constants
*****************************************************************************}

    const
      { declare aliases }
      LOC_MMREGISTER = LOC_SSEREGISTER;
      LOC_CMMREGISTER = LOC_CSSEREGISTER;

      max_operands = 3;

      {# Constant defining possibly all registers which might require saving }
      ALL_REGISTERS = [firstreg..lastreg];
      ALL_INTREGISTERS = [1..255];

      {# low and high of the available maximum width integer general purpose }
      { registers                                                            }
      LoGPReg = R_EAX;
      HiGPReg = R_EDX;

      {# low and high of every possible width general purpose register (same as }
      { above on most architctures apart from the 80x86)                        }
      LoReg = R_EAX;
      HiReg = R_DH;

      {# Table of registers which can be allocated by the code generator
         internally, when generating the code.
      }
      { legend:                                                                }
      { xxxregs = set of all possibly used registers of that type in the code  }
      {           generator                                                    }
      { usableregsxxx = set of all 32bit components of registers that can be   }
      {           possible allocated to a regvar or using getregisterxxx (this }
      {           excludes registers which can be only used for parameter      }
      {           passing on ABI's that define this)                           }
      { c_countusableregsxxx = amount of registers in the usableregsxxx set    }

      maxintregs = 4;
      intregs = [R_EAX..R_BL]-[R_ESI,R_SI];

      maxfpuregs = 8;
      fpuregs = [R_ST0..R_ST7];
      usableregsfpu = [];
      c_countusableregsfpu = 0;

      mmregs = [R_MM0..R_MM7];
      usableregsmm = [R_MM0..R_MM7];
      c_countusableregsmm  = 8;

{*****************************************************************************
                            CPU Dependent Constants
*****************************************************************************}

    {$i cpubase.inc}

{*****************************************************************************
                                  Helpers
*****************************************************************************}

    procedure convert_register_to_enum(var r:Tregister);
    function cgsize2subreg(s:Tcgsize):Tsubregister;
    function reg2opsize(r:tregister):topsize;
    function is_calljmp(o:tasmop):boolean;
    procedure inverse_flags(var f: TResFlags);
    function flags_to_cond(const f: TResFlags) : TAsmCond;


implementation

    uses  verbose;

{*****************************************************************************
                                  Helpers
*****************************************************************************}

    procedure convert_register_to_enum(var r:Tregister);

    begin
      if r.enum=R_INTREGISTER then
        case r.number of
          NR_NO:  r.enum:=R_NO;
          NR_EAX: r.enum:=R_EAX;        NR_EBX: r.enum:=R_EBX;
          NR_ECX: r.enum:=R_ECX;        NR_EDX: r.enum:=R_EDX;
          NR_ESI: r.enum:=R_ESI;        NR_EDI: r.enum:=R_EDI;
          NR_ESP: r.enum:=R_ESP;        NR_EBP: r.enum:=R_EBP;
          NR_AX:  r.enum:=R_AX;         NR_BX:  r.enum:=R_BX;
          NR_CX:  r.enum:=R_CX;         NR_DX:  r.enum:=R_DX;
          NR_SI:  r.enum:=R_SI;         NR_DI:  r.enum:=R_DI;
          NR_SP:  r.enum:=R_SP;         NR_BP:  r.enum:=R_BP;
          NR_AL:  r.enum:=R_AL;         NR_BL:  r.enum:=R_BL;
          NR_CL:  r.enum:=R_CL;         NR_DL:  r.enum:=R_DL;
          NR_AH:  r.enum:=R_AH;         NR_BH:  r.enum:=R_BH;
          NR_CH:  r.enum:=R_CH;         NR_DH:  r.enum:=R_DH;
          NR_CS:  r.enum:=R_CS;         NR_DS:  r.enum:=R_DS;
          NR_ES:  r.enum:=R_ES;         NR_FS:  r.enum:=R_FS;
          NR_GS:  r.enum:=R_GS;         NR_SS:  r.enum:=R_SS;
        else
{          internalerror(200301082);}
          r.enum:=R_TR3;
        end;
    end;

    function cgsize2subreg(s:Tcgsize):Tsubregister;

    begin
      case s of
        OS_8,OS_S8:
          cgsize2subreg:=R_SUBL;
        OS_16,OS_S16:
          cgsize2subreg:=R_SUBW;
        OS_32,OS_S32:
          cgsize2subreg:=R_SUBD;
        OS_64,OS_S64:
          cgsize2subreg:=R_SUBQ;
        else
          internalerror(200301231);
      end;
    end;


    function reg2opsize(r:Tregister):topsize;
      const
        subreg2opsize : array[0..4] of topsize = (S_B,S_B,S_W,S_L,S_D);

{$ifdef x86_64}
        enum2opsize:array[firstreg..lastreg] of topsize = (S_NO,
          S_Q,S_Q,S_Q,S_Q,S_Q,S_Q,S_Q,S_Q,
          S_Q,S_Q,S_Q,S_Q,S_Q,S_Q,S_Q,S_Q,S_Q,
          S_L,S_L,S_L,S_L,S_L,S_L,S_L,S_L,
          S_L,S_L,S_L,S_L,S_L,S_L,S_L,S_L,
          S_W,S_W,S_W,S_W,S_W,S_W,S_W,S_W,
          S_W,S_W,S_W,S_W,S_W,S_W,S_W,S_W,
          S_B,S_B,S_B,S_B,S_B,S_B,S_B,S_B,
          S_B,S_B,S_B,S_B,S_B,S_B,S_B,S_B,
          S_B,S_B,S_B,S_B,
          S_W,S_W,S_W,S_W,S_W,S_W,
          S_FL,S_FL,S_FL,S_FL,S_FL,S_FL,S_FL,S_FL,S_FL,
          S_L,S_L,S_L,S_L,S_L,S_L,
          S_L,S_L,S_L,S_L,
          S_L,S_L,S_L,S_L,S_L,
          S_D,S_D,S_D,S_D,S_D,S_D,S_D,S_D,
          S_D,S_D,S_D,S_D,S_D,S_D,S_D,S_D,
          S_D,S_D,S_D,S_D,S_D,S_D,S_D,S_D
        );
{$else x86_64}
        enum2opsize : array[firstreg..lastreg] of topsize = (S_NO,
          S_L,S_L,S_L,S_L,S_L,S_L,S_L,S_L,
          S_W,S_W,S_W,S_W,S_W,S_W,S_W,S_W,
          S_B,S_B,S_B,S_B,S_B,S_B,S_B,S_B,
          S_W,S_W,S_W,S_W,S_W,S_W,
          S_FL,S_FL,S_FL,S_FL,S_FL,S_FL,S_FL,S_FL,S_FL,
          S_L,S_L,S_L,S_L,S_L,S_L,
          S_L,S_L,S_L,S_L,
          S_L,S_L,S_L,S_L,S_L,
          S_D,S_D,S_D,S_D,S_D,S_D,S_D,S_D,
          S_D,S_D,S_D,S_D,S_D,S_D,S_D,S_D
        );
{$endif x86_64}

      begin
        reg2opsize:=S_L;
        if (r.enum=R_INTREGISTER) then
         begin
           if (r.number shr 8)=0 then
            begin
              case r.number of
                NR_CS,NR_DS,NR_ES,
                NR_SS,NR_FS,NR_GS :
                  reg2opsize:=S_W;
              end;
            end
           else
            begin
              if (r.number and $ff)>4 then
                internalerror(200303181);
              reg2opsize:=subreg2opsize[r.number and $ff];
            end;
         end
        else
         begin
           reg2opsize:=enum2opsize[r.enum];
         end;
      end;

{$ifdef unused}
    function supreg_name(r:Tsuperregister):string;

    var s:string[4];

    const supreg_names:array[0..last_supreg] of string[4]=
          ('INV',
           'eax','ebx','ecx','edx','esi','edi','ebp','esp',
           'r8' ,'r9', 'r10','r11','r12','r13','r14','r15');

    begin
      if r in [0..last_supreg] then
        supreg_name:=supreg_names[r]
      else
        begin
          str(r,s);
          supreg_name:='reg'+s;
        end;
    end;
{$endif unused}

    function is_calljmp(o:tasmop):boolean;
      begin
        case o of
          A_CALL,
          A_JCXZ,
          A_JECXZ,
          A_JMP,
          A_LOOP,
          A_LOOPE,
          A_LOOPNE,
          A_LOOPNZ,
          A_LOOPZ,
          A_Jcc :
            is_calljmp:=true;
          else
            is_calljmp:=false;
        end;
      end;


    procedure inverse_flags(var f: TResFlags);
      const
        inv_flags: array[TResFlags] of TResFlags =
          (F_NE,F_E,F_LE,F_GE,F_L,F_G,F_NC,F_C,F_BE,F_B,F_AE,F_A);
      begin
        f:=inv_flags[f];
      end;


    function flags_to_cond(const f: TResFlags) : TAsmCond;
      const
        flags_2_cond : array[TResFlags] of TAsmCond =
          (C_E,C_NE,C_G,C_L,C_GE,C_LE,C_C,C_NC,C_A,C_AE,C_B,C_BE);
      begin
        result := flags_2_cond[f];
      end;


end.
{
  $Log$
  Revision 1.7  2003-06-03 21:11:09  peter
    * cg.a_load_* get a from and to size specifier
    * makeregsize only accepts newregister
    * i386 uses generic tcgnotnode,tcgunaryminus

  Revision 1.6  2003/06/03 13:01:59  daniel
    * Register allocator finished

  Revision 1.5  2003/05/30 23:57:08  peter
    * more sparc cleanup
    * accumulator removed, splitted in function_return_reg (called) and
      function_result_reg (caller)

  Revision 1.4  2003/04/30 20:53:32  florian
    * error when address of an abstract method is taken
    * fixed some x86-64 problems
    * merged some more x86-64 and i386 code

  Revision 1.3  2002/04/25 20:15:40  florian
    * block nodes within expressions shouldn't release the used registers,
      fixed using a flag till the new rg is ready

  Revision 1.2  2002/04/25 16:12:09  florian
    * fixed more problems with cpubase and x86-64

  Revision 1.1  2003/04/25 11:12:09  florian
    * merged i386/cpubase and x86_64/cpubase to x86/cpubase;
      different stuff went to cpubase.inc

  Revision 1.50  2003/04/25 08:25:26  daniel
    * Ifdefs around a lot of calls to cleartempgen
    * Fixed registers that are allocated but not freed in several nodes
    * Tweak to register allocator to cause less spills
    * 8-bit registers now interfere with esi,edi and ebp
      Compiler can now compile rtl successfully when using new register
      allocator

  Revision 1.49  2003/04/22 23:50:23  peter
    * firstpass uses expectloc
    * checks if there are differences between the expectloc and
      location.loc from secondpass in EXTDEBUG

  Revision 1.48  2003/04/22 14:33:38  peter
    * removed some notes/hints

  Revision 1.47  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 1.46  2003/04/21 19:16:50  peter
    * count address regs separate

  Revision 1.45  2003/03/28 19:16:57  peter
    * generic constructor working for i386
    * remove fixed self register
    * esi added as address register for i386

  Revision 1.44  2003/03/18 18:15:53  peter
    * changed reg2opsize to function

  Revision 1.43  2003/03/08 08:59:07  daniel
    + $define newra will enable new register allocator
    + getregisterint will return imaginary registers with $newra
    + -sr switch added, will skip register allocation so you can see
      the direct output of the code generator before register allocation

  Revision 1.42  2003/02/19 22:00:15  daniel
    * Code generator converted to new register notation
    - Horribily outdated todo.txt removed

  Revision 1.41  2003/02/02 19:25:54  carl
    * Several bugfixes for m68k target (register alloc., opcode emission)
    + VIS target
    + Generic add more complete (still not verified)

  Revision 1.40  2003/01/13 18:37:44  daniel
    * Work on register conversion

  Revision 1.39  2003/01/09 20:41:00  daniel
    * Converted some code in cgx86.pas to new register numbering

  Revision 1.38  2003/01/09 15:49:56  daniel
    * Added register conversion

  Revision 1.37  2003/01/08 22:32:36  daniel
    * Added register convesrion procedure

  Revision 1.36  2003/01/08 18:43:57  daniel
   * Tregister changed into a record

  Revision 1.35  2003/01/05 13:36:53  florian
    * x86-64 compiles
    + very basic support for float128 type (x86-64 only)

  Revision 1.34  2002/11/17 18:26:16  mazen
  * fixed a compilation bug accmulator-->FUNCTION_RETURN_REG, in definition of return_result_reg

  Revision 1.33  2002/11/17 17:49:08  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 1.32  2002/10/05 12:43:29  carl
    * fixes for Delphi 6 compilation
     (warning : Some features do not work under Delphi)

  Revision 1.31  2002/08/14 18:41:48  jonas
    - remove valuelow/valuehigh fields from tlocation, because they depend
      on the endianess of the host operating system -> difficult to get
      right. Use lo/hi(location.valueqword) instead (remember to use
      valueqword and not value!!)

  Revision 1.30  2002/08/13 21:40:58  florian
    * more fixes for ppc calling conventions

  Revision 1.29  2002/08/12 15:08:41  carl
    + stab register indexes for powerpc (moved from gdb to cpubase)
    + tprocessor enumeration moved to cpuinfo
    + linker in target_info is now a class
    * many many updates for m68k (will soon start to compile)
    - removed some ifdef or correct them for correct cpu

  Revision 1.28  2002/08/06 20:55:23  florian
    * first part of ppc calling conventions fix

  Revision 1.27  2002/07/25 18:01:29  carl
    + FPURESULTREG -> FPU_RESULT_REG

  Revision 1.26  2002/07/07 09:52:33  florian
    * powerpc target fixed, very simple units can be compiled
    * some basic stuff for better callparanode handling, far from being finished

  Revision 1.25  2002/07/01 18:46:30  peter
    * internal linker
    * reorganized aasm layer

  Revision 1.24  2002/07/01 16:23:55  peter
    * cg64 patch
    * basics for currency
    * asnode updates for class and interface (not finished)

  Revision 1.23  2002/05/18 13:34:22  peter
    * readded missing revisions

  Revision 1.22  2002/05/16 19:46:50  carl
  + defines.inc -> fpcdefs.inc to avoid conflicts if compiling by hand
  + try to fix temp allocation (still in ifdef)
  + generic constructor calls
  + start of tassembler / tmodulebase class cleanup

  Revision 1.19  2002/05/12 16:53:16  peter
    * moved entry and exitcode to ncgutil and cgobj
    * foreach gets extra argument for passing local data to the
      iterator function
    * -CR checks also class typecasts at runtime by changing them
      into as
    * fixed compiler to cycle with the -CR option
    * fixed stabs with elf writer, finally the global variables can
      be watched
    * removed a lot of routines from cga unit and replaced them by
      calls to cgobj
    * u32bit-s32bit updates for and,or,xor nodes. When one element is
      u32bit then the other is typecasted also to u32bit without giving
      a rangecheck warning/error.
    * fixed pascal calling method with reversing also the high tree in
      the parast, detected by tcalcst3 test

  Revision 1.18  2002/04/21 15:31:40  carl
  - removed some other stuff to their units

  Revision 1.17  2002/04/20 21:37:07  carl
  + generic FPC_CHECKPOINTER
  + first parameter offset in stack now portable
  * rename some constants
  + move some cpu stuff to other units
  - remove unused constents
  * fix stacksize for some targets
  * fix generic size problems which depend now on EXTEND_SIZE constant
  * removing frame pointer in routines is only available for : i386,m68k and vis targets

  Revision 1.16  2002/04/15 19:53:54  peter
    * fixed conflicts between the last 2 commits

  Revision 1.15  2002/04/15 19:44:20  peter
    * fixed stackcheck that would be called recursively when a stack
      error was found
    * generic changeregsize(reg,size) for i386 register resizing
    * removed some more routines from cga unit
    * fixed returnvalue handling
    * fixed default stacksize of linux and go32v2, 8kb was a bit small :-)

  Revision 1.14  2002/04/15 19:12:09  carl
  + target_info.size_of_pointer -> pointer_size
  + some cleanup of unused types/variables
  * move several constants from cpubase to their specific units
    (where they are used)
  + att_Reg2str -> gas_reg2str
  + int_reg2str -> std_reg2str

  Revision 1.13  2002/04/14 16:59:41  carl
  + att_reg2str -> gas_reg2str

  Revision 1.12  2002/04/02 17:11:34  peter
    * tlocation,treference update
    * LOC_CONSTANT added for better constant handling
    * secondadd splitted in multiple routines
    * location_force_reg added for loading a location to a register
      of a specified size
    * secondassignment parses now first the right and then the left node
      (this is compatible with Kylix). This saves a lot of push/pop especially
      with string operations
    * adapted some routines to use the new cg methods

  Revision 1.11  2002/03/31 20:26:37  jonas
    + a_loadfpu_* and a_loadmm_* methods in tcg
    * register allocation is now handled by a class and is mostly processor
      independent (+rgobj.pas and i386/rgcpu.pas)
    * temp allocation is now handled by a class (+tgobj.pas, -i386\tgcpu.pas)
    * some small improvements and fixes to the optimizer
    * some register allocation fixes
    * some fpuvaroffset fixes in the unary minus node
    * push/popusedregisters is now called rg.save/restoreusedregisters and
      (for i386) uses temps instead of push/pop's when using -Op3 (that code is
      also better optimizable)
    * fixed and optimized register saving/restoring for new/dispose nodes
    * LOC_FPU locations now also require their "register" field to be set to
      R_ST, not R_ST0 (the latter is used for LOC_CFPUREGISTER locations only)
    - list field removed of the tnode class because it's not used currently
      and can cause hard-to-find bugs

  Revision 1.10  2002/03/04 19:10:12  peter
    * removed compiler warnings

}