freepascal.compiler/rtl/i386/i386.inc

{
    $Id$
    This file is part of the Free Pascal run time library.
    Copyright (c) 1999-2000 by the Free Pascal development team.

    Processor dependent implementation for the system unit for
    intel i386+

    See the file COPYING.FPC, included in this distribution,
    for details about the copyright.

    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.

 **********************************************************************}

{****************************************************************************
                               Primitives
****************************************************************************}
var
  has_sse_support,has_mmx_support : boolean;

{$asmmode intel}

function cpuid_support : boolean;assembler;
  {
    Check if the ID-flag can be changed, if changed then CpuID is supported.
    Tested under go32v1 and Linux on c6x86 with CpuID enabled and disabled (PFV)
  }
  asm
     pushf
     pushf
     pop     eax
     mov     ebx,eax
     xor     eax,200000h
    push    eax
     popf
     pushf
     pop     eax
     popf
     and     eax,200000h
     and     ebx,200000h
     cmp     eax,ebx
     setnz   al
  end;

{$asmmode ATT}

function sse_support : boolean;
  var
     _edx : longint;
  begin
    if cpuid_support then
     begin
        asm
           movl $1,%eax
           cpuid
           movl %edx,_edx
        end;
        sse_support:=(_edx and $2000000)<>0;
     end
    else
     { a cpu with without cpuid instruction supports never sse }
     sse_support:=false;
  end;


{ returns true, if the processor supports the mmx instructions }
function mmx_support : boolean;

  var
     _edx : longint;

  begin
     if cpuid_support then
       begin
          asm
             movl $1,%eax
             cpuid
             movl %edx,_edx
          end;
          mmx_support:=(_edx and $800000)<>0;
       end
     else
       { a cpu with without cpuid instruction supports never mmx }
       mmx_support:=false;
  end;

{$i fastmove.inc}

procedure fpc_cpuinit;
begin
  has_sse_support:=sse_support;
  has_mmx_support:=mmx_support;
  setup_fastmove;
end;


function geteipasebx : pointer;assembler;[public,alias:'FPC_GETEIPINEBX'];
asm
  movl (%esp),%ebx
  ret
end;

{$ifndef FPC_SYSTEM_HAS_MOVE}
{$define FPC_SYSTEM_HAS_MOVE}
procedure Move(const source;var dest;count:SizeInt);[public, alias: 'FPC_MOVE'];assembler;
var
  saveesi,saveedi : longint;
asm
        movl    %edi,saveedi
        movl    %esi,saveesi
{$ifdef REGCALL}
        movl    %eax,%esi
        movl    %edx,%edi
        movl    %ecx,%edx
{$else}
        movl    dest,%edi
        movl    source,%esi
        movl    count,%edx
{$endif}
        movl    %edi,%eax
{ check for zero or negative count }
        cmpl    $0,%edx
        jle     .LMoveEnd
{ Check for back or forward }
        sub     %esi,%eax
        jz      .LMoveEnd               { Do nothing when source=dest }
        jc      .LFMove                 { Do forward, dest<source }
        cmp     %edx,%eax
        jb      .LBMove                 { Dest is in range of move, do backward }
{ Forward Copy }
.LFMove:
        cld
        cmpl    $15,%edx
        jl      .LFMove1
        movl    %edi,%ecx       { Align on 32bits }
        negl    %ecx
        andl    $3,%ecx
        subl    %ecx,%edx
        rep
        movsb
        movl    %edx,%ecx
        andl    $3,%edx
        shrl    $2,%ecx
        rep
        movsl
.LFMove1:
        movl    %edx,%ecx
        rep
        movsb
        jmp .LMoveEnd
{ Backward Copy }
.LBMove:
        std
        addl    %edx,%esi
        addl    %edx,%edi
        movl    %edi,%ecx
        decl    %esi
        decl    %edi
        cmpl    $15,%edx
        jl      .LBMove1
        negl    %ecx            { Align on 32bits }
        andl    $3,%ecx
        subl    %ecx,%edx
        rep
        movsb
        movl    %edx,%ecx
        andl    $3,%edx
        shrl    $2,%ecx
        subl    $3,%esi
        subl    $3,%edi
        rep
        movsl
        addl    $3,%esi
        addl    $3,%edi
.LBMove1:
        movl    %edx,%ecx
        rep
        movsb
        cld
.LMoveEnd:
        movl    saveedi,%edi
        movl    saveesi,%esi
end;
{$endif FPC_SYSTEM_HAS_MOVE}


{$ifndef FPC_SYSTEM_HAS_FILLCHAR}
{$define FPC_SYSTEM_HAS_FILLCHAR}
Procedure FillChar(var x;count:SizeInt;value:byte);assembler;

asm
        {A push is prefered over a local variable because a local
         variable causes the compiler to generate a stackframe.}
        cld
{$ifdef REGCALL}
        push    %edi
        movl    %eax,%edi
        movzbl  %cl,%eax
        movl    %edx,%ecx
{$else}
        movl    x,%edi
        movl    count,%ecx
        movzbl  value,%eax
        movl    %ecx,%edx
{$endif}
{ check for zero or negative count }
        or      %ecx,%ecx
        jle     .LFillEnd
        cmpl    $7,%ecx
        jl      .LFill1
        imul    $0x01010101,%eax { Expand al into a 4 subbytes of eax}
        shrl    $2,%ecx
        andl    $3,%edx
        rep
        stosl
        movl    %edx,%ecx
.LFill1:
        rep
        stosb
.LFillEnd:
{$ifdef REGCALL}
        pop %edi
{$endif}
end;
{$endif FPC_SYSTEM_HAS_FILLCHAR}


{$ifndef FPC_SYSTEM_HAS_FILLWORD}
{$define FPC_SYSTEM_HAS_FILLWORD}
procedure fillword(var x;count : SizeInt;value : word);assembler;
var
  saveedi : longint;
asm
        movl    %edi,saveedi
{$ifdef REGCALL}
        movl    %eax,%edi
        movzwl  %cx,%eax
        movl    %edx,%ecx
{$else}
        movl    x,%edi
        movl    count,%ecx
        movzwl  value,%eax
{$endif}
{ check for zero or negative count }
        cmpl    $0,%ecx
        jle     .LFillWordEnd
        movl    %eax,%edx
        shll    $16,%eax
        orl     %edx,%eax
        movl    %ecx,%edx
        shrl    $1,%ecx
        cld
        rep
        stosl
        movl    %edx,%ecx
        andl    $1,%ecx
        rep
        stosw
.LFillWordEnd:
        movl    saveedi,%edi
end;
{$endif FPC_SYSTEM_HAS_FILLWORD}


{$ifndef FPC_SYSTEM_HAS_FILLDWORD}
{$define FPC_SYSTEM_HAS_FILLDWORD}
procedure filldword(var x;count : SizeInt;value : dword);assembler;
var
  saveedi : longint;
asm
        movl    %edi,saveedi
{$ifdef REGCALL}
        movl    %eax,%edi
        movl    %ecx,%eax
        movl    %edx,%ecx
{$else}
        movl    x,%edi
        movl    count,%ecx
        movl    value,%eax
{$endif}
{ check for zero or negative count }
        cmpl    $0,%ecx
        jle     .LFillDWordEnd
        cld
        rep
        stosl
.LFillDWordEnd:
        movl    saveedi,%edi
end;
{$endif FPC_SYSTEM_HAS_FILLDWORD}


{$ifndef FPC_SYSTEM_HAS_INDEXBYTE}
{$define FPC_SYSTEM_HAS_INDEXBYTE}
function IndexByte(Const buf;len:SizeInt;b:byte):SizeInt; assembler;
var
  saveedi,saveebx : longint;
asm
        movl    %edi,saveedi
        movl    %ebx,saveebx
        movl    buf,%edi       // Load String
        movb    b,%bl
        movl    len,%ecx       // Load len
        xorl    %eax,%eax
        testl   %ecx,%ecx
        jz      .Lcharposnotfound
        cld
        movl    %ecx,%edx      // Copy for easy manipulation
        movb    %bl,%al
        repne
        scasb
        jne     .Lcharposnotfound
        incl    %ecx
        subl    %ecx,%edx
        movl    %edx,%eax
        jmp     .Lready
.Lcharposnotfound:
        movl    $-1,%eax
.Lready:
        movl    saveedi,%edi
        movl    saveebx,%ebx
end;
{$endif FPC_SYSTEM_HAS_FILLDWORD}


{$ifndef FPC_SYSTEM_HAS_INDEXWORD}
{$define FPC_SYSTEM_HAS_INDEXWORD}
function Indexword(Const buf;len:SizeInt;b:word):SizeInt; assembler;
var
  saveedi,saveebx : longint;
asm
        movl    %edi,saveedi
        movl    %ebx,saveebx
        movl    Buf,%edi       // Load String
        movw    b,%bx
        movl    Len,%ecx       // Load len
        xorl    %eax,%eax
        testl   %ecx,%ecx
        jz      .Lcharposnotfound
        cld
        movl    %ecx,%edx      // Copy for easy manipulation
        movw    %bx,%ax
        repne
        scasw
        jne     .Lcharposnotfound
        incl    %ecx
        subl    %ecx,%edx
        movl    %edx,%eax
        jmp     .Lready
.Lcharposnotfound:
        movl    $-1,%eax
.Lready:
        movl    saveedi,%edi
        movl    saveebx,%ebx
end;
{$endif FPC_SYSTEM_HAS_INDEXWORD}


{$ifndef FPC_SYSTEM_HAS_INDEXDWORD}
{$define FPC_SYSTEM_HAS_INDEXDWORD}
function IndexDWord(Const buf;len:SizeInt;b:DWord):SizeInt; assembler;
var
  saveedi,saveebx : longint;
asm
        movl    %edi,saveedi
        movl    %ebx,saveebx
{$ifdef REGCALL}
        movl    %eax,%edi
        movl    %ecx,%ebx
        movl    %edx,%ecx
{$else}
        movl    Len,%ecx       // Load len
        movl    Buf,%edi       // Load String
        movl    b,%ebx
{$endif}
        xorl    %eax,%eax
        testl   %ecx,%ecx
        jz      .Lcharposnotfound
        cld
        movl    %ecx,%edx      // Copy for easy manipulation
        movl    %ebx,%eax
        repne
        scasl
        jne     .Lcharposnotfound
        incl    %ecx
        subl    %ecx,%edx
        movl    %edx,%eax
        jmp     .Lready
.Lcharposnotfound:
        movl    $-1,%eax
.Lready:
        movl    saveedi,%edi
        movl    saveebx,%ebx
end;
{$endif FPC_SYSTEM_HAS_INDEXDWORD}


{$ifndef FPC_SYSTEM_HAS_COMPAREBYTE}
{$define FPC_SYSTEM_HAS_COMPAREBYTE}
function CompareByte(Const buf1,buf2;len:SizeInt):SizeInt; assembler;
var
  saveesi,saveedi : longint;
asm
        movl    %edi,saveedi
        movl    %esi,saveesi
        cld
{$ifdef REGCALL}
        movl    %eax,%edi
        movl    %edx,%esi
        movl    %ecx,%eax
{$else}
        movl    len,%eax
        movl    buf2,%esi       { Load params}
        movl    buf1,%edi
{$endif}
        testl   %eax,%eax       {We address -1(%esi), so we have to deal with len=0}
        je      .LCmpbyteExit
        cmpl    $7,%eax         {<7 not worth aligning and go through all trouble}
        jl      .LCmpbyte2
        movl    %edi,%ecx       { Align on 32bits }
        negl    %ecx            { calc bytes to align   (%edi and 3) xor 3= -%edi and 3}
        andl    $3,%ecx
        subl    %ecx,%eax       { Subtract from number of bytes to go}
        orl     %ecx,%ecx
        rep
        cmpsb                   {The actual 32-bit Aligning}
        jne     .LCmpbyte3
        movl    %eax,%ecx       {bytes to do, divide by 4}
        andl    $3,%eax         {remainder}
        shrl    $2,%ecx         {The actual division}
        orl     %ecx,%ecx       {Sets zero flag if ecx=0 -> no cmp}
        rep
        cmpsl
        je      .LCmpbyte2       { All equal? then to the left over bytes}
        movl    $4,%eax         { Not equal. Rescan the last 4 bytes bytewise}
        subl    %eax,%esi
        subl    %eax,%edi
.LCmpbyte2:
        movl    %eax,%ecx       {bytes still to (re)scan}
        orl     %eax,%eax       {prevent disaster in case %eax=0}
        rep
        cmpsb
.LCmpbyte3:
        movzbl  -1(%esi),%ecx
        movzbl  -1(%edi),%eax      // Compare failing (or equal) position
        subl    %ecx,%eax
.LCmpbyteExit:
        movl    saveedi,%edi
        movl    saveesi,%esi
end;
{$endif FPC_SYSTEM_HAS_COMPAREBYTE}



{$ifndef FPC_SYSTEM_HAS_COMPAREWORD}
{$define FPC_SYSTEM_HAS_COMPAREWORD}
function CompareWord(Const buf1,buf2;len:SizeInt):SizeInt; assembler;
var
  saveesi,saveedi,saveebx : longint;
asm
        movl    %edi,saveedi
        movl    %esi,saveesi
        movl    %ebx,saveebx
        cld
{$ifdef REGCALL}
        movl    %eax,%edi
        movl    %edx,%esi
        movl    %ecx,%eax
{$else}
        movl    len,%eax
        movl    buf2,%esi       { Load params}
        movl    buf1,%edi
{$endif}
        testl   %eax,%eax       {We address -2(%esi), so we have to deal with len=0}
        je      .LCmpwordExit
        cmpl    $5,%eax         {<5 (3 bytes align + 4 bytes cmpsl = 4 words}
        jl      .LCmpword2      { not worth aligning and go through all trouble}
        movl    (%edi),%ebx     // Compare alignment bytes.
        cmpl    (%esi),%ebx
        jne     .LCmpword2      // Aligning will go wrong already. Max 2 words will be scanned Branch NOW
        shll    $1,%eax         {Convert word count to bytes}
        movl    %edi,%edx       { Align comparing is already done, so simply add}
        negl    %edx            { calc bytes to align  -%edi and 3}
        andl    $3,%edx
        addl    %edx,%esi       { Skip max 3 bytes alignment}
        addl    %edx,%edi
        subl    %edx,%eax       { Subtract from number of bytes to go}
        movl    %eax,%ecx       { Make copy of bytes to go}
        andl    $3,%eax         { Calc remainder (mod 4) }
        andl    $1,%edx         { %edx is 1 if array not 2-aligned, 0 otherwise}
        shrl    $2,%ecx         { divide bytes to go by 4, DWords to go}
        orl     %ecx,%ecx       { Sets zero flag if ecx=0 -> no cmp}
        rep                     { Compare entire DWords}
        cmpsl
        je      .LCmpword2a     { All equal? then to the left over bytes}
        movl    $4,%eax         { Not equal. Rescan the last 4 bytes bytewise}
        subl    %eax,%esi       { Go back one DWord}
        subl    %eax,%edi
        incl    %eax            {if not odd then this does nothing, else it makes
                                  sure that adding %edx increases from 2 to 3 words}
.LCmpword2a:
        subl    %edx,%esi       { Subtract alignment}
        subl    %edx,%edi
        addl    %edx,%eax
        shrl    $1,%eax
.LCmpword2:
        movl    %eax,%ecx       {words still to (re)scan}
        orl     %eax,%eax       {prevent disaster in case %eax=0}
        rep
        cmpsw
.LCmpword3:
        movzwl  -2(%esi),%ecx
        movzwl  -2(%edi),%eax    // Compare failing (or equal) position
        subl    %ecx,%eax        // calculate end result.
.LCmpwordExit:
        movl    saveedi,%edi
        movl    saveesi,%esi
        movl    saveebx,%ebx
end;
{$endif FPC_SYSTEM_HAS_COMPAREWORD}


{$ifndef FPC_SYSTEM_HAS_COMPAREDWORD}
{$define FPC_SYSTEM_HAS_COMPAREDWORD}
function CompareDWord(Const buf1,buf2;len:SizeInt):SizeInt; assembler;
var
  saveesi,saveedi,saveebx : longint;
asm
        movl    %edi,saveedi
        movl    %esi,saveesi
        movl    %ebx,saveebx
        cld
{$ifdef REGCALL}
        movl    %eax,%edi
        movl    %edx,%esi
        movl    %ecx,%eax
{$else}
        movl    len,%eax
        movl    buf2,%esi       { Load params}
        movl    buf1,%edi
{$endif}
        testl   %eax,%eax       {We address -2(%esi), so we have to deal with len=0}
        je      .LCmpDwordExit
        cmpl    $3,%eax         {<3 (3 bytes align + 4 bytes cmpsl) = 2 DWords}
        jl      .LCmpDword2      { not worth aligning and go through all trouble}
        movl    (%edi),%ebx     // Compare alignment bytes.
        cmpl    (%esi),%ebx
        jne     .LCmpDword2      // Aligning will go wrong already. Max 2 words will be scanned Branch NOW
        shll    $2,%eax         {Convert word count to bytes}
        movl    %edi,%edx       { Align comparing is already done, so simply add}
        negl    %edx            { calc bytes to align  -%edi and 3}
        andl    $3,%edx
        addl    %edx,%esi       { Skip max 3 bytes alignment}
        addl    %edx,%edi
        subl    %edx,%eax       { Subtract from number of bytes to go}
        movl    %eax,%ecx       { Make copy of bytes to go}
        andl    $3,%eax         { Calc remainder (mod 4) }
        shrl    $2,%ecx         { divide bytes to go by 4, DWords to go}
        orl     %ecx,%ecx       { Sets zero flag if ecx=0 -> no cmp}
        rep                     { Compare entire DWords}
        cmpsl
        je      .LCmpDword2a     { All equal? then to the left over bytes}
        movl    $4,%eax         { Not equal. Rescan the last 4 bytes bytewise}
        subl    %eax,%esi       { Go back one DWord}
        subl    %eax,%edi
        addl    $3,%eax         {if align<>0 this causes repcount to be 2}
.LCmpDword2a:
        subl    %edx,%esi       { Subtract alignment}
        subl    %edx,%edi
        addl    %edx,%eax
        shrl    $2,%eax
.LCmpDword2:
        movl    %eax,%ecx       {words still to (re)scan}
        orl     %eax,%eax       {prevent disaster in case %eax=0}
        rep
        cmpsl
.LCmpDword3:
        movzwl  -4(%esi),%ecx
        movzwl  -4(%edi),%eax    // Compare failing (or equal) position
        subl    %ecx,%eax        // calculate end result.
.LCmpDwordExit:
        movl    saveedi,%edi
        movl    saveesi,%esi
        movl    saveebx,%ebx
end;
{$endif FPC_SYSTEM_HAS_COMPAREDWORD}


{$ifndef FPC_SYSTEM_HAS_INDEXCHAR0}
{$define FPC_SYSTEM_HAS_INDEXCHAR0}
function IndexChar0(Const buf;len:SizeInt;b:Char):SizeInt; assembler;
var
  saveesi,saveebx : longint;
asm
        movl    %esi,saveesi
        movl    %ebx,saveebx
// Can't use scasb, or will have to do it twice, think this
//   is faster for small "len"
{$ifdef REGCALL}
        movl    %eax,%esi        // Load address
        movzbl  %cl,%ebx          // Load searchpattern
{$else}
        movl    Buf,%esi        // Load address
        movl    len,%edx        // load maximal searchdistance
        movzbl  b,%ebx          // Load searchpattern
{$endif}
        testl   %edx,%edx
        je      .LFound
        xorl    %ecx,%ecx       // zero index in Buf
        xorl    %eax,%eax       // To make DWord compares possible
.LLoop:
        movb    (%esi),%al      // Load byte
        cmpb    %al,%bl
        je      .LFound         //  byte the same?
        incl    %ecx
        incl    %esi
        cmpl    %edx,%ecx       // Maximal distance reached?
        je      .LNotFound
        testl   %eax,%eax       // Nullchar = end of search?
        jne     .LLoop
.LNotFound:
        movl    $-1,%ecx        // Not found return -1
.LFound:
        movl    %ecx,%eax
        movl    saveesi,%esi
        movl    saveebx,%ebx
end;
{$endif FPC_SYSTEM_HAS_INDEXCHAR0}


{****************************************************************************
                              Object Helpers
****************************************************************************}
{$ifndef HAS_GENERICCONSTRUCTOR}
{$define FPC_SYSTEM_HAS_FPC_HELP_CONSTRUCTOR}
procedure fpc_help_constructor; assembler; [public,alias:'FPC_HELP_CONSTRUCTOR']; {$ifdef hascompilerproc} compilerproc; {$endif}
asm
{ Entry without preamble, since we need the ESP of the constructor
  Stack (relative to %ebp):
    12 Self
     8 VMT-Address
     4 main programm-Addr
     0 %ebp
     edi contains the vmt position
}
      { eax isn't touched anywhere, so it doesn't have to reloaded }
        movl    8(%ebp),%eax
      { initialise self ? }
        orl     %esi,%esi
        jne     .LHC_4
      { get memory, but save register first temporary variable }
        subl    $4,%esp
        movl    %esp,%esi
      { Save Register}
        pushal
{$ifdef valuegetmem}
        { esi can be destroyed in fpc_getmem!!! (JM) }
        pushl   %esi
{$endif valuegetmem}
      { Memory size }
        pushl   (%eax)
{$ifdef valuegetmem}
        call    fpc_getmem
        popl    %esi
        movl    %eax,(%esi)
{$else valuegetmem}
        pushl   %esi
        call    AsmGetMem
{$endif valuegetmem}
        movl    $-1,8(%ebp)
        popal
      { Avoid 80386DX bug }
        nop
      { Memory position to %esi }
        movl    (%esi),%esi
        addl    $4,%esp
      { If no memory available : fail() }
        orl     %esi,%esi
        jz      .LHC_5
      { init self for the constructor }
        movl    %esi,12(%ebp)
      { jmp not necessary anymore because next instruction is disabled (JM)
        jmp     .LHC_6                          }
      { Why was the VMT reset to zero here ????
        I need it fail to know if I should
        zero the VMT field in static objects PM }
.LHC_4:
      {  movl    $0,8(%ebp)                      }
.LHC_6:
      { is there a VMT address ? }
        orl     %eax,%eax
        jnz     .LHC_7
      { In case the constructor doesn't do anything, the Zero-Flag }
      { can't be put, because this calls Fail() }
        incl    %eax
        ret
.LHC_7:
      { set zero inside the object }
        pushal
        cld
        movl    (%eax),%ecx
        movl    %esi,%edi
        movl    %ecx,%ebx
        xorl    %eax,%eax
        shrl    $2,%ecx
        andl    $3,%ebx
        rep
        stosl
        movl    %ebx,%ecx
        rep
        stosb
        popal
        { avoid the 80386DX bug }
        nop
      { set the VMT address for the new created object }
      { the offset is in %edi since the calling and has not been changed !! }
        movl    %eax,(%esi,%edi,1)
        testl   %eax,%eax
.LHC_5:
end;


{$define FPC_SYSTEM_HAS_FPC_HELP_FAIL}
procedure fpc_help_fail;assembler;[public,alias:'FPC_HELP_FAIL']; {$ifdef hascompilerproc} compilerproc; {$endif}
{ should be called with a object that needs to be
  freed if VMT field is at -1
  %edi contains VMT offset in object again }
asm
        testl  %esi,%esi
        je     .LHF_1
        cmpl   $-1,8(%ebp)
        je     .LHF_2
        { reset vmt field to zero for static instances }
        cmpl    $0,8(%ebp)
        je      .LHF_3
        { main constructor, we can zero the VMT field now }
        movl    $0,(%esi,%edi,1)
.LHF_3:
        { we zero esi to indicate failure }
        xorl    %esi,%esi
        jmp    .LHF_1
.LHF_2:
        { get vmt address in eax }
        movl    (%esi,%edi,1),%eax
        movl    %esi,12(%ebp)
        { push object position }
{$ifdef valuefreemem}
        pushl   %esi
        call    fpc_freemem
{$else valuefreemem}
        leal    12(%ebp),%eax
        pushl   %eax
        call    AsmFreeMem
{$endif valuefreemem}
        { set both object places to zero }
        xorl    %esi,%esi
        movl    %esi,12(%ebp)
.LHF_1:
end;


{$define FPC_SYSTEM_HAS_FPC_HELP_DESTRUCTOR}
procedure fpc_help_destructor;assembler;[public,alias:'FPC_HELP_DESTRUCTOR']; {$ifdef hascompilerproc} compilerproc; {$endif}
asm
{ Stack (relative to %ebp):
    12 Self
     8 VMT-Address
     4 Main program-Addr
     0 %ebp
     edi contains the vmt position
}
        pushal
      { Should the object be resolved ? }
        movl    8(%ebp),%eax
        orl     %eax,%eax
        jz      .LHD_3
      { Yes, get size from SELF! }
        movl    12(%ebp),%eax
      { get VMT-pointer (from Self) to %ebx }
      { the offset is in %edi since the calling and has not been changed !! }
        movl    (%eax,%edi,1),%ebx
      { I think for precaution }
      { that we should clear the VMT here }
        movl    $0,(%eax,%edi,1)
{$ifdef valuefreemem}
      { Freemem }
        pushl   %eax
        call    fpc_freemem
{$else valuefreemem}
      { temporary Variable }
        subl    $4,%esp
        movl    %esp,%edi
      { SELF }
        movl    %eax,(%edi)
        pushl   %edi
        call    AsmFreeMem
        addl    $4,%esp
{$endif valuefreemem}
.LHD_3:
        popal
        { avoid the 80386DX bug }
        nop
end;


{$define FPC_SYSTEM_HAS_FPC_NEW_CLASS}
procedure fpc_new_class;assembler;[public,alias:'FPC_NEW_CLASS']; {$ifdef hascompilerproc} compilerproc; {$endif}
asm
        { to be sure in the future, we save also edit }
        pushl   %edi
        { create class ? }
        movl    8(%ebp),%edi
        { if we test eax later without calling newinstance }
        { it must have a value <>0                         }
        movl    $1,%eax
        testl   %edi,%edi
        jz      .LNEW_CLASS1
        { save registers !! }
        pushl   %ebx
        pushl   %ecx
        pushl   %edx
        { esi contains the vmt }
        pushl   %esi
        { call newinstance (class method!) }
        call    *52{vmtNewInstance}(%esi)
        popl    %edx
        popl    %ecx
        popl    %ebx
        { newinstance returns a pointer to the new created }
        { instance in eax                                  }
        { load esi and insert self                         }
        movl    %eax,%esi
.LNEW_CLASS1:
        movl    %esi,8(%ebp)
        testl   %eax,%eax
        popl    %edi
end;


{ Internal alias that can be reference from asm code }
procedure int_dispose_class;external name 'FPC_DISPOSE_CLASS';

{$define FPC_SYSTEM_HAS_FPC_DISPOSE_CLASS}
procedure fpc_dispose_class;assembler;[public,alias:'FPC_DISPOSE_CLASS']; {$ifdef hascompilerproc} compilerproc; {$endif}
asm
        { to be sure in the future, we save also edit }
        pushl   %edi
        { destroy class ? }
        movl    12(%ebp),%edi
        testl   %edi,%edi
        jz      .LDISPOSE_CLASS1
        { no inherited call }
        movl    (%esi),%edi
        { save registers !! }
        pushl   %eax
        pushl   %ebx
        pushl   %ecx
        pushl   %edx
        { push self }
        pushl   %esi
        { call freeinstance }
        call    *56{vmtFreeInstance}(%edi)
        popl    %edx
        popl    %ecx
        popl    %ebx
        popl    %eax
.LDISPOSE_CLASS1:
        popl    %edi
end;

{$define FPC_SYSTEM_HAS_FPC_HELP_FAIL_CLASS}
procedure fpc_help_fail_class;assembler;[public,alias:'FPC_HELP_FAIL_CLASS']; {$ifdef hascompilerproc} compilerproc; {$endif}
{ a non zero class must allways be disposed
  VMT is allways at pos 0 }
asm
        testl  %esi,%esi
        je     .LHFC_1
        { can't use the compilerproc version as that will generate a
          reference instead of a symbol }
        call   int_dispose_class
        { set both object places to zero }
        xorl    %esi,%esi
        movl    %esi,8(%ebp)
.LHFC_1:
end;

{$define FPC_SYSTEM_HAS_FPC_CHECK_OBJECT}
{ we want the stack for debugging !! PM }
procedure fpc_check_object(obj : pointer);[public,alias:'FPC_CHECK_OBJECT']; {$ifdef hascompilerproc} compilerproc; {$endif}
begin
asm
        pushl   %edi
        movl    obj,%edi
        pushl   %eax
        { Here we must check if the VMT pointer is nil before  }
        { accessing it...                                      }
        testl   %edi,%edi
        jz      .Lco_re
        movl    (%edi),%eax
        addl    4(%edi),%eax
        jz      .Lco_ok
.Lco_re:
        pushl   $210
        call    HandleError
.Lco_ok:
        popl    %eax
        popl    %edi
        { the adress is pushed : it needs to be removed from stack !! PM }
end;{ of asm }
end;


{$define FPC_SYSTEM_HAS_FPC_CHECK_OBJECT_EXT}
procedure fpc_check_object_ext;assembler;[public,alias:'FPC_CHECK_OBJECT_EXT']; {$ifdef hascompilerproc} compilerproc; {$endif}
{ checks for a correct vmt pointer }
{ deeper check to see if the current object is }
{ really related to the true }
asm
        pushl   %ebp
        movl    %esp,%ebp
        pushl   %edi
        movl    8(%ebp),%edi
        pushl   %ebx
        movl    12(%ebp),%ebx
        pushl   %eax
        { Here we must check if the VMT pointer is nil before  }
        { accessing it...                                      }
.Lcoext_obj:
        testl   %edi,%edi
        jz      .Lcoext_re
        movl    (%edi),%eax
        addl    4(%edi),%eax
        jnz     .Lcoext_re
        cmpl    %edi,%ebx
        je      .Lcoext_ok
.Lcoext_vmt:
        movl    8(%edi),%eax
        cmpl    %ebx,%eax
        je      .Lcoext_ok
        movl    %eax,%edi
        jmp     .Lcoext_obj
.Lcoext_re:
        pushl   $219
        call    HandleError
.Lcoext_ok:
        popl    %eax
        popl    %ebx
        popl    %edi
        { the adress and vmt were pushed : it needs to be removed from stack !! PM }
        popl    %ebp
        ret     $8
end;

{$endif HAS_GENERICCONSTRUCTOR}


{****************************************************************************
                                 String
****************************************************************************}

{$ifndef FPC_SYSTEM_HAS_FPC_SHORTSTR_ASSIGN}
{$define FPC_SYSTEM_HAS_FPC_SHORTSTR_ASSIGN}

function fpc_shortstr_to_shortstr(len:longint; const sstr: shortstring): shortstring; [public,alias: 'FPC_SHORTSTR_TO_SHORTSTR']; {$ifdef hascompilerproc} compilerproc; {$endif}
begin
  asm
        cld
        movl    __RESULT,%edi
        movl    sstr,%esi
        xorl    %eax,%eax
        movl    len,%ecx
        lodsb
        cmpl    %ecx,%eax
        jbe     .LStrCopy1
        movl    %ecx,%eax
.LStrCopy1:
        stosb
        cmpl    $7,%eax
        jl      .LStrCopy2
        movl    %edi,%ecx       { Align on 32bits }
        negl    %ecx
        andl    $3,%ecx
        subl    %ecx,%eax
        rep
        movsb
        movl    %eax,%ecx
        andl    $3,%eax
        shrl    $2,%ecx
        rep
        movsl
.LStrCopy2:
        movl    %eax,%ecx
        rep
        movsb
  end ['ESI','EDI','EAX','ECX'];
end;


{$ifdef interncopy}
procedure fpc_shortstr_assign(len:longint;sstr,dstr:pointer);[public,alias:'FPC_SHORTSTR_ASSIGN'];
{$else}
procedure fpc_shortstr_copy(len:longint;sstr,dstr:pointer);[public,alias:'FPC_SHORTSTR_COPY'];
{$endif}
begin
  asm
        pushl   %eax
        pushl   %ecx
        cld
        movl    dstr,%edi
        movl    sstr,%esi
        xorl    %eax,%eax
        movl    len,%ecx
        lodsb
        cmpl    %ecx,%eax
        jbe     .LStrCopy1
        movl    %ecx,%eax
.LStrCopy1:
        stosb
        cmpl    $7,%eax
        jl      .LStrCopy2
        movl    %edi,%ecx       { Align on 32bits }
        negl    %ecx
        andl    $3,%ecx
        subl    %ecx,%eax
        rep
        movsb
        movl    %eax,%ecx
        andl    $3,%eax
        shrl    $2,%ecx
        rep
        movsl
.LStrCopy2:
        movl    %eax,%ecx
        rep
        movsb
        popl    %ecx
        popl    %eax
  end ['ESI','EDI'];
end;
{$endif FPC_SYSTEM_HAS_FPC_SHORTSTR_ASSIGN}


{$ifndef FPC_SYSTEM_HAS_FPC_SHORTSTR_CONCAT}
{$define FPC_SYSTEM_HAS_FPC_SHORTSTR_CONCAT}

function fpc_shortstr_concat(const s1,s2:shortstring):shortstring;{$ifdef hascompilerproc}compilerproc;{$endif}
begin
  asm
        movl    __RESULT,%edi
        movl    %edi,%ebx
        movl    s1,%esi         { first string }
        lodsb
        andl    $0x0ff,%eax
        stosb
        cmpl    $7,%eax
        jl      .LStrConcat1
        movl    %edi,%ecx       { Align on 32bits }
        negl    %ecx
        andl    $3,%ecx
        subl    %ecx,%eax
        rep
        movsb
        movl    %eax,%ecx
        andl    $3,%eax
        shrl    $2,%ecx
        rep
        movsl
.LStrConcat1:
        movl    %eax,%ecx
        rep
        movsb
        movl    s2,%esi       { second string }
        movzbl  (%ebx),%ecx
        negl    %ecx
        addl    $0x0ff,%ecx
        lodsb
        cmpl    %ecx,%eax
        jbe     .LStrConcat2
        movl    %ecx,%eax
.LStrConcat2:
        addb    %al,(%ebx)
        cmpl    $7,%eax
        jl      .LStrConcat3
        movl    %edi,%ecx       { Align on 32bits }
        negl    %ecx
        andl    $3,%ecx
        subl    %ecx,%eax
        rep
        movsb
        movl    %eax,%ecx
        andl    $3,%eax
        shrl    $2,%ecx
        rep
        movsl
.LStrConcat3:
        movl    %eax,%ecx
        rep
        movsb
  end ['EBX','ECX','EAX','ESI','EDI'];
end;
{$endif FPC_SYSTEM_HAS_FPC_SHORTSTR_CONCAT}


{$ifndef FPC_SYSTEM_HAS_FPC_SHORTSTR_APPEND_SHORTSTR}
{$define FPC_SYSTEM_HAS_FPC_SHORTSTR_APPEND_SHORTSTR}

{$ifdef hascompilerproc}
procedure fpc_shortstr_append_shortstr(var s1:shortstring;const s2:shortstring);compilerproc;
    [public,alias:'FPC_SHORTSTR_APPEND_SHORTSTR'];
begin
  asm
        movl    s1,%edi
        movl    s2,%esi
        movl    %edi,%ebx
        movzbl  (%edi),%ecx
        movl    __HIGH(s1),%eax
        lea     1(%edi,%ecx),%edi
        negl    %ecx
        addl    %eax,%ecx
        // no need to zero eax, high(s1) <= 255
        lodsb
        cmpl    %ecx,%eax
        jbe     .LStrConcat1
        movl    %ecx,%eax
.LStrConcat1:
        addb    %al,(%ebx)
        cmpl    $7,%eax
        jl      .LStrConcat2
        movl    %edi,%ecx       { Align on 32bits }
        negl    %ecx
        andl    $3,%ecx
        subl    %ecx,%eax
        rep
        movsb
        movl    %eax,%ecx
        andl    $3,%eax
        shrl    $2,%ecx
        rep
        movsl
.LStrConcat2:
        movl    %eax,%ecx
        rep
        movsb
  end ['EBX','ECX','EAX','ESI','EDI'];
end;
{$else hascompilerproc}
procedure fpc_shortstr_concat_int(const s1,s2:shortstring);[public,alias:'FPC_SHORTSTR_CONCAT'];
begin
  asm
        movl    s1,%esi
        movl    s2,%edi
        movl    %edi,%ebx
        movzbl  (%edi),%ecx
        xor     %eax,%eax
        lea     1(%edi,%ecx),%edi
        negl    %ecx
        addl    $0x0ff,%ecx
        lodsb
        cmpl    %ecx,%eax
        jbe     .LStrConcat1
        movl    %ecx,%eax
.LStrConcat1:
        addb    %al,(%ebx)
        cmpl    $7,%eax
        jl      .LStrConcat2
        movl    %edi,%ecx       { Align on 32bits }
        negl    %ecx
        andl    $3,%ecx
        subl    %ecx,%eax
        rep
        movsb
        movl    %eax,%ecx
        andl    $3,%eax
        shrl    $2,%ecx
        rep
        movsl
.LStrConcat2:
        movl    %eax,%ecx
        rep
        movsb
  end ['EBX','ECX','EAX','ESI','EDI'];
end;
{$endif hascompilerproc}
{$endif FPC_SYSTEM_HAS_FPC_SHORTSTR_APPEND_SHORTSTR}


{$ifndef FPC_SYSTEM_HAS_FPC_SHORTSTR_COMPARE}
{$define FPC_SYSTEM_HAS_FPC_SHORTSTR_COMPARE}

{$ifdef SHORTSTRCOMPAREINREG}
function fpc_shortstr_compare(const left,right:shortstring): longint;assembler; [public,alias:'FPC_SHORTSTR_COMPARE']; compilerproc;
var
  saveesi,saveedi,saveebx : longint;
asm
        movl    %edi,saveedi
        movl    %esi,saveesi
        movl    %ebx,saveebx
        cld
        movl    right,%esi
        movl    left,%edi
        movzbl  (%esi),%eax
        movzbl  (%edi),%ebx
        movl    %eax,%edx
        incl    %esi
        incl    %edi
        cmpl    %ebx,%eax
        jbe     .LStrCmp1
        movl    %ebx,%eax
.LStrCmp1:
        cmpl    $7,%eax
        jl      .LStrCmp2
        movl    %edi,%ecx       { Align on 32bits }
        negl    %ecx
        andl    $3,%ecx
        subl    %ecx,%eax
        orl     %ecx,%ecx
        rep
        cmpsb
        jne     .LStrCmp3
        movl    %eax,%ecx
        andl    $3,%eax
        shrl    $2,%ecx
        orl     %ecx,%ecx
        rep
        cmpsl
        je      .LStrCmp2
        movl    $4,%eax
        subl    %eax,%esi
        subl    %eax,%edi
.LStrCmp2:
        movl    %eax,%ecx
        orl     %eax,%eax
        rep
        cmpsb
        je      .LStrCmp4
.LStrCmp3:
        movzbl  -1(%esi),%edx      // Compare failing (or equal) position
        movzbl  -1(%edi),%ebx
.LStrCmp4:
        movl    %ebx,%eax          // Compare length or position
        subl    %edx,%eax
        movl    saveedi,%edi
        movl    saveesi,%esi
        movl    saveebx,%ebx
end;
{$else SHORTSTRCOMPAREINREG}
function fpc_shortstr_compare(const left,right:shortstring): longint; [public,alias:'FPC_SHORTSTR_COMPARE']; {$ifdef hascompilerproc} compilerproc; {$endif}
begin
  asm
        cld
        xorl    %ebx,%ebx
        xorl    %eax,%eax
        movl    right,%esi
        movl    left,%edi
        movb    (%esi),%al
        movb    (%edi),%bl
        movl    %eax,%edx
        incl    %esi
        incl    %edi
        cmpl    %ebx,%eax
        jbe     .LStrCmp1
        movl    %ebx,%eax
.LStrCmp1:
        cmpl    $7,%eax
        jl      .LStrCmp2
        movl    %edi,%ecx       { Align on 32bits }
        negl    %ecx
        andl    $3,%ecx
        subl    %ecx,%eax
        orl     %ecx,%ecx
        rep
        cmpsb
        jne     .LStrCmp3
        movl    %eax,%ecx
        andl    $3,%eax
        shrl    $2,%ecx
        orl     %ecx,%ecx
        rep
        cmpsl
        je      .LStrCmp2
        movl    $4,%eax
        sub     %eax,%esi
        sub     %eax,%edi
.LStrCmp2:
        movl    %eax,%ecx
        orl     %eax,%eax
        rep
        cmpsb
        jne     .LStrCmp3
        cmp     %ebx,%edx
.LStrCmp3:
  end ['EDX','ECX','EBX','EAX','ESI','EDI'];
end;
{$endif SHORTSTRCOMPAREINREG}

{$endif FPC_SYSTEM_HAS_FPC_SHORTSTR_COMPARE}


{$ifndef FPC_SYSTEM_HAS_FPC_PCHAR_TO_SHORTSTR}
{$define FPC_SYSTEM_HAS_FPC_PCHAR_TO_SHORTSTR}
function fpc_pchar_to_shortstr(p:pchar):shortstring;assembler;[public,alias:'FPC_PCHAR_TO_SHORTSTR']; {$ifdef hascompilerproc} compilerproc; {$endif}
{$include strpas.inc}
{$endif FPC_SYSTEM_HAS_FPC_PCHAR_TO_SHORTSTR}


{$ifndef FPC_SYSTEM_HAS_FPC_PCHAR_LENGTH}
{$define FPC_SYSTEM_HAS_FPC_PCHAR_LENGTH}
function fpc_pchar_length(p:pchar):longint;assembler;[public,alias:'FPC_PCHAR_LENGTH']; {$ifdef hascompilerproc} compilerproc; {$endif}
{$include strlen.inc}
{$endif FPC_SYSTEM_HAS_FPC_PCHAR_LENGTH}


{$define FPC_SYSTEM_HAS_GET_FRAME}
function get_frame:pointer;assembler;{$ifdef SYSTEMINLINE}inline;{$endif}
asm
        movl    %ebp,%eax
end ['EAX'];


{$define FPC_SYSTEM_HAS_GET_CALLER_ADDR}
function get_caller_addr(framebp:pointer):pointer;assembler;{$ifdef SYSTEMINLINE}inline;{$endif}
asm
{$ifndef REGCALL}
        movl    framebp,%eax
{$endif}
        orl     %eax,%eax
        jz      .Lg_a_null
        movl    4(%eax),%eax
.Lg_a_null:
end ['EAX'];


{$define FPC_SYSTEM_HAS_GET_CALLER_FRAME}
function get_caller_frame(framebp:pointer):pointer;assembler;{$ifdef SYSTEMINLINE}inline;{$endif}
asm
{$ifndef REGCALL}
        movl    framebp,%eax
{$endif}
        orl     %eax,%eax
        jz      .Lgnf_null
        movl    (%eax),%eax
.Lgnf_null:
end ['EAX'];


{****************************************************************************
                                 Math
****************************************************************************}

{$define FPC_SYSTEM_HAS_ABS_LONGINT}
function abs(l:longint):longint; assembler;{$ifdef SYSTEMINLINE}inline;{$endif}{$ifndef INTERNCONSTINTF}[internconst:fpc_in_const_abs];{$endif}
asm
{$ifndef REGCALL}
        movl    l,%eax
{$endif}
        cltd
        xorl    %edx,%eax
        subl    %edx,%eax
end ['EAX','EDX'];


{$define FPC_SYSTEM_HAS_ODD_LONGINT}
function odd(l:longint):boolean;assembler;{$ifdef SYSTEMINLINE}inline;{$endif}{$ifndef INTERNCONSTINTF}[internconst:fpc_in_const_odd];{$endif}
asm
{$ifdef SYSTEMINLINE}
       movl     l,%eax
{$else}
{$ifndef REGCALL}
       movl     l,%eax
{$endif}
{$endif}
       andl     $1,%eax
       setnz    %al
end ['EAX'];


{$define FPC_SYSTEM_HAS_SQR_LONGINT}
function sqr(l:longint):longint;assembler;{$ifdef SYSTEMINLINE}inline;{$endif}{$ifndef INTERNCONSTINTF}[internconst:fpc_in_const_sqr];{$endif}
asm
{$ifdef SYSTEMINLINE}
       movl     l,%eax
{$else}
{$ifndef REGCALL}
       movl     l,%eax
{$endif}
{$endif}
        imull   %eax,%eax
end ['EAX'];


{$define FPC_SYSTEM_HAS_SPTR}
Function Sptr : Pointer;assembler;{$ifdef SYSTEMINLINE}inline;{$endif}
asm
        movl    %esp,%eax
end;


{****************************************************************************
                                 Str()
****************************************************************************}

{$define FPC_SYSTEM_HAS_INT_STR_LONGINT}
procedure int_str(l : longint;var s : string);
var
  buffer : array[0..15] of byte;
  isneg  : byte;
begin
  { Workaround: }
  if l=longint($80000000) then
   begin
     s:='-2147483648';
     exit;
   end;
  asm
        movl    l,%eax          // load Integer
        xorl    %ecx,%ecx       // String length=0
        leal    buffer,%ebx
        movl    $0x0a,%esi      // load 10 as dividing constant.
        movb    $0,isneg
        orl     %eax,%eax       // Sign ?
        jns     .LM2
        movb    $1,isneg
        negl    %eax
.LM2:
        cltd
        idivl   %esi
        addb    $0x30,%dl       // convert Rest to ASCII.
        movb    %dl,(%ebx)
        incl    %ecx
        incl    %ebx
        cmpl    $0,%eax
        jnz     .LM2
        { now copy the string }
        movl    s,%edi          // Load String address
        cmpb    $0,isneg
        je      .LM3
        movb    $0x2d,(%ebx)
        incl    %ecx
        incl    %ebx
.LM3:
        movb    %cl,(%edi)      // Copy String length
        incl    %edi
.LM4:
        decl    %ebx
        movb    (%ebx),%al
        stosb
        decl    %ecx
        jnz     .LM4
  end ['eax','ecx','edx','ebx','esi','edi'];
end;


{$define FPC_SYSTEM_HAS_INT_STR_LONGWORD}
procedure int_str(c : longword;var s : string);
var
  buffer : array[0..15] of byte;
begin
  asm
        movl    c,%eax          // load CARDINAL
        xorl    %ecx,%ecx       // String length=0
        leal    buffer,%ebx
        movl    $0x0a,%esi      // load 10 as dividing constant.
.LM4:
        xorl    %edx,%edx
        divl    %esi
        addb    $0x30,%dl       // convert Rest to ASCII.
        movb    %dl,(%ebx)
        incl    %ecx
        incl    %ebx
        cmpl    $0,%eax
        jnz     .LM4
        { now copy the string }
        movl    s,%edi          // Load String address
        movb    %cl,(%edi)      // Copy String length
        incl    %edi
.LM5:
        decl    %ebx
        movb    (%ebx),%al
        stosb
        decl    %ecx
        jnz     .LM5
  end ['eax','ecx','edx','ebx','esi','edi'];
end;


{****************************************************************************
                               Bounds Check
****************************************************************************}

{$ifndef NOBOUNDCHECK}

procedure int_boundcheck;assembler;[public,alias: 'FPC_BOUNDCHECK'];
var dummy_to_force_stackframe_generation_for_trace: Longint;
{
  called with:
    %ecx - value
    %edi - pointer to the ranges
}
asm
        cmpl    (%edi),%ecx
        jl      .Lbc_err
        cmpl    4(%edi),%ecx
        jle     .Lbc_ok
.Lbc_err:
        pushl   %ebp
        pushl   $201
        call    HandleErrorFrame
.Lbc_ok:
end;

{$endif NOBOUNDCHECK}

{ do a thread save inc/dec }
{$define FPC_SYSTEM_HAS_DECLOCKED_LONGINT}
function declocked(var l : longint) : boolean;assembler;

  asm
{$ifndef REGCALL}
     movl       l,%eax
{$endif}
     { this check should be done because a lock takes a lot }
     { of time!                                             }
     cmpb       $0,IsMultithread
     jz         .Ldeclockednolock
     lock
     decl       (%eax)
     jmp        .Ldeclockedend
.Ldeclockednolock:
     decl       (%eax);
.Ldeclockedend:
     setzb      %al
  end;

{$define FPC_SYSTEM_HAS_INCLOCKED_LONGINT}
procedure inclocked(var l : longint);assembler;

  asm
{$ifndef REGCALL}
     movl       l,%eax
{$endif}
     { this check should be done because a lock takes a lot }
     { of time!                                             }
     cmpb       $0,IsMultithread
     jz         .Linclockednolock
     lock
     incl       (%eax)
     jmp        .Linclockedend
.Linclockednolock:
     incl       (%eax)
.Linclockedend:
  end;

{****************************************************************************
                                  FPU
****************************************************************************}

const
  fpucw : word = $1332;
  { Internal constants for use in system unit }
  FPU_Invalid = 1;
  FPU_Denormal = 2;
  FPU_DivisionByZero = 4;
  FPU_Overflow = 8;
  FPU_Underflow = $10;
  FPU_StackUnderflow = $20;
  FPU_StackOverflow = $40;
  FPU_ExceptionMask = $ff;

{$define FPC_SYSTEM_HAS_SYSRESETFPU}
Procedure SysResetFPU;assembler;{$ifdef SYSTEMINLINE}inline;{$endif}
asm
    fninit
    fldcw   fpucw
end;



{
  $Log$
  Revision 1.67  2005-01-23 20:03:23  florian
    + fastmove from John O'Harrow integrated

  Revision 1.66  2004/11/17 22:19:04  peter
  internconst, internproc and some external declarations moved to interface

  Revision 1.65  2004/11/01 12:43:29  peter
    * shortstr compare with empty string fixed
    * removed special i386 code

  Revision 1.64  2004/07/18 20:21:44  florian
    + several unicode (to/from utf-8 conversion) stuff added
    * some longint -> SizeInt changes

  Revision 1.63  2004/07/18 16:40:08  jonas
    * fixed indexbyte/word/dword when length is 0 (return -1 instead of 0)

  Revision 1.62  2004/07/07 17:38:58  daniel
    * Aligment code in fillchar proved to slow down stuff seriously instead of
      speeding it up. This is logical, the compiler aligns everything very well,
      it is possible that fillchar gets called on misaligned data, but it seems
      this never happens.

  Revision 1.61  2004/04/29 20:00:47  peter
    * inclocked_longint ifdef fixed

  Revision 1.60  2004/04/26 15:55:01  peter
    * FPC_MOVE alias

  Revision 1.59  2004/02/05 01:16:12  florian
    + completed x86-64/linux system unit

  Revision 1.58  2004/01/11 11:10:07  jonas
    + cgeneric.inc: implementations of rtl routines based on libc
    * system.inc: include cgeneric.inc before powerpc.inc/i386.inc/... if
      FPC_USE_LIBC is defined
    * powerpc.inc, i386.inc: check whether the routines they implement aren't
      implemented yet in another include file (cgeneric.inc)

  Revision 1.57  2004/01/02 17:22:14  jonas
    + fpc_cpuinit procedure to allow cpu/fpu initialisation before any unit
      initialises
    + fpu exceptions for invalid operations and division by zero enabled for
      ppc

  Revision 1.56  2003/12/24 23:07:28  peter
    * fixed indexbyte for regcall

  Revision 1.55  2003/12/04 21:44:39  peter
    * fix warning in gas

  Revision 1.54  2003/11/19 16:58:44  peter
    * make strpas assembler function

  Revision 1.53  2003/11/11 21:08:17  peter
    * REGCALL define added

  Revision 1.52  2003/11/03 09:42:27  marco
   * Peter's Cardinal<->Longint fixes patch

  Revision 1.51  2003/10/27 09:16:57  marco
   * fix from peter i386.inc to circumvent ebx destroying

  Revision 1.50  2003/10/23 17:01:27  peter
    * save edi,ebx,esi in int_str

  Revision 1.49  2003/10/16 21:28:40  peter
    * use __HIGH()

  Revision 1.48  2003/10/14 00:57:48  florian
    + some code for PIC support added

  Revision 1.47  2003/09/14 11:34:13  peter
    * moved int64 asm code to int64p.inc
    * save ebx,esi

  Revision 1.46  2003/09/08 18:21:37  peter
    * save edi,esi,ebx

  Revision 1.45  2003/06/01 14:50:17  jonas
    * fpc_shortstr_append_shortstr has to use high(s1) instead of 255 as
      maxlen
    + ppc version of fpc_shortstr_append_shortstr

  Revision 1.44  2003/05/26 21:18:13  peter
    * FPC_SHORTSTR_APPEND_SHORTSTR public added

  Revision 1.43  2003/05/26 19:36:46  peter
    * fpc_shortstr_concat is now the same for all targets
    * fpc_shortstr_append_shortstr added for optimized code generation

  Revision 1.42  2003/05/16 22:40:11  florian
    * fixed generic shortstr_compare

  Revision 1.41  2003/03/26 00:19:10  peter
    * ifdef HAS_GENERICCONSTRUCTOR

  Revision 1.40  2003/03/17 14:30:11  peter
    * changed address parameter/return values to pointer instead
      of longint

  Revision 1.39  2003/02/18 17:56:06  jonas
    - removed buggy i386-specific FPC_CHARARRAY_TO_SHORTSTR
    * fixed generic FPC_CHARARRAY_TO_SHORTSTR (web bug 2382)
    * fixed some potential range errors in indexchar/word/dword

  Revision 1.38  2003/01/06 23:03:13  mazen
  + defining FPC_SYSTEM_HAS_DECLOCKED and FPC_SYSTEM_HAS_INCLOCKED to avoid
    compilation error on generic.inc

  Revision 1.37  2003/01/03 17:14:54  peter
    * fix possible overflow when array len > 255 when converting to
      shortstring

  Revision 1.36  2002/12/15 22:32:25  peter
    * fixed return value when len=0 for indexchar,indexword

  Revision 1.35  2002/10/20 11:50:57  carl
   * avoid crashes with negative len counts on fills/moves

  Revision 1.34  2002/10/15 19:24:47  carl
    * Replace 220 -> 219

  Revision 1.33  2002/10/14 19:39:16  peter
    * threads unit added for thread support

  Revision 1.32  2002/10/05 14:20:16  peter
    * fpc_pchar_length compilerproc and strlen alias

  Revision 1.31  2002/10/02 18:21:51  peter
    * Copy() changed to internal function calling compilerprocs
    * FPC_SHORTSTR_COPY renamed to FPC_SHORTSTR_ASSIGN because of the
      new copy functions

  Revision 1.30  2002/09/07 21:33:35  carl
    - removed unused defines

  Revision 1.29  2002/09/07 16:01:19  peter
    * old logs removed and tabs fixed

  Revision 1.28  2002/09/03 15:43:36  peter
    * add alias for fpc_dispose_class so it can be called from
      fpc_help_fail_class

  Revision 1.27  2002/08/19 19:34:02  peter
    * SYSTEMINLINE define that will add inline directives for small
      functions and wrappers. This will be defined automaticly when
      the compiler defines the HASINLINE directive

  Revision 1.26  2002/07/26 15:45:33  florian
    * changed multi threading define: it's MT instead of MTRTL

  Revision 1.25  2002/07/06 20:31:59  carl
  + added TEST_GENERIC to test generic version

  Revision 1.24  2002/06/16 08:21:26  carl
  + TEST_GENERIC to test generic versions of code

  Revision 1.23  2002/06/09 12:54:37  jonas
    * fixed memory corruption bug in fpc_help_constructor

  Revision 1.22  2002/04/21 18:56:59  peter
    * fpc_freemem and fpc_getmem compilerproc

  Revision 1.21  2002/04/01 14:23:17  carl
  - no need for runerror 203, already fixed!

  Revision 1.20  2002/03/30 14:52:04  carl
  * cause runtime error 203 on failed class creation

}