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

    This unit implements the code generator for the i386

    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;

{$i fpcdefs.inc}

  interface

    uses
       globtype,
       cgbase,cgobj,cg64f32,cgx86,
       aasmbase,aasmtai,aasmcpu,
       cpubase,parabase,cgutils,
       symconst
       ;

    type
      tcg386 = class(tcgx86)
        procedure init_register_allocators;override;
        { passing parameter using push instead of mov }
        procedure a_param_reg(list : taasmoutput;size : tcgsize;r : tregister;const cgpara : tcgpara);override;
        procedure a_param_const(list : taasmoutput;size : tcgsize;a : aint;const cgpara : tcgpara);override;
        procedure a_param_ref(list : taasmoutput;size : tcgsize;const r : treference;const cgpara : tcgpara);override;
        procedure a_paramaddr_ref(list : taasmoutput;const r : treference;const cgpara : tcgpara);override;

        procedure g_proc_exit(list : taasmoutput;parasize:longint;nostackframe:boolean);override;
        procedure g_copyvaluepara_openarray(list : taasmoutput;const ref:treference;const lenloc:tlocation;elesize:aint;destreg:tregister);override;

        procedure g_exception_reason_save(list : taasmoutput; const href : treference);override;
        procedure g_exception_reason_save_const(list : taasmoutput; const href : treference; a: aint);override;
        procedure g_exception_reason_load(list : taasmoutput; const href : treference);override;
     end;

      tcg64f386 = 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 : int64;reg : tregister64);override;
        procedure a_op64_const_ref(list : taasmoutput;op:TOpCG;value : int64;const ref : treference);override;
      private
        procedure get_64bit_ops(op:TOpCG;var op1,op2:TAsmOp);
      end;

  implementation

    uses
       globals,verbose,systems,cutils,
       paramgr,procinfo,
       rgcpu,rgx86;

    function use_push(const cgpara:tcgpara):boolean;
      begin
        result:=assigned(cgpara.location) and
                (cgpara.location^.loc=LOC_REFERENCE) and
                (cgpara.location^.reference.index=NR_STACK_POINTER_REG);
      end;


    procedure Tcg386.init_register_allocators;
      begin
        inherited init_register_allocators;
        if cs_create_pic in aktmoduleswitches then
          rg[R_INTREGISTER]:=trgcpu.create(R_INTREGISTER,R_SUBWHOLE,[RS_EAX,RS_EDX,RS_ECX,RS_ESI,RS_EDI],first_int_imreg,[RS_EBP,RS_EBX])
        else
          rg[R_INTREGISTER]:=trgcpu.create(R_INTREGISTER,R_SUBWHOLE,[RS_EAX,RS_EDX,RS_ECX,RS_EBX,RS_ESI,RS_EDI],first_int_imreg,[RS_EBP]);
        rg[R_MMXREGISTER]:=trgcpu.create(R_MMXREGISTER,R_SUBNONE,[RS_XMM0,RS_XMM1,RS_XMM2,RS_XMM3,RS_XMM4,RS_XMM5,RS_XMM6,RS_XMM7],first_mm_imreg,[]);
        rg[R_MMREGISTER]:=trgcpu.create(R_MMREGISTER,R_SUBNONE,[RS_XMM0,RS_XMM1,RS_XMM2,RS_XMM3,RS_XMM4,RS_XMM5,RS_XMM6,RS_XMM7],first_mm_imreg,[]);
        rgfpu:=Trgx86fpu.create;
      end;


    procedure tcg386.a_param_reg(list : taasmoutput;size : tcgsize;r : tregister;const cgpara : tcgpara);
      var
        pushsize : tcgsize;
      begin
        check_register_size(size,r);
        if use_push(cgpara) then
          begin
            cgpara.check_simple_location;
            pushsize:=int_cgsize(cgpara.alignment);
            list.concat(taicpu.op_reg(A_PUSH,tcgsize2opsize[pushsize],makeregsize(list,r,pushsize)));
          end
        else
          inherited a_param_reg(list,size,r,cgpara);
      end;


    procedure tcg386.a_param_const(list : taasmoutput;size : tcgsize;a : aint;const cgpara : tcgpara);
      var
        pushsize : tcgsize;
      begin
        if use_push(cgpara) then
          begin
            cgpara.check_simple_location;
            pushsize:=int_cgsize(cgpara.alignment);
            list.concat(taicpu.op_const(A_PUSH,tcgsize2opsize[pushsize],a));
          end
        else
          inherited a_param_const(list,size,a,cgpara);
      end;


    procedure tcg386.a_param_ref(list : taasmoutput;size : tcgsize;const r : treference;const cgpara : tcgpara);

        procedure pushdata(paraloc:pcgparalocation;ofs:aint);
        var
          pushsize : tcgsize;
          tmpreg   : tregister;
          href     : treference;
        begin
          if not assigned(paraloc) then
            exit;
          if (paraloc^.loc<>LOC_REFERENCE) or
             (paraloc^.reference.index<>NR_STACK_POINTER_REG) or
             (tcgsize2size[paraloc^.size]>sizeof(aint)) then
            internalerror(200501162);
          { Pushes are needed in reverse order, add the size of the
            current location to the offset where to load from. This
            prevents wrong calculations for the last location when
            the size is not a power of 2 }
          if assigned(paraloc^.next) then
            pushdata(paraloc^.next,ofs+tcgsize2size[paraloc^.size]);
          { Push the data starting at ofs }
          href:=r;
          inc(href.offset,ofs);
          if tcgsize2size[paraloc^.size]>cgpara.alignment then
            pushsize:=paraloc^.size
          else
            pushsize:=int_cgsize(cgpara.alignment);
          if tcgsize2size[paraloc^.size]<cgpara.alignment then
            begin
              tmpreg:=getintregister(list,pushsize);
              a_load_ref_reg(list,paraloc^.size,pushsize,href,tmpreg);
              list.concat(taicpu.op_reg(A_PUSH,TCgsize2opsize[pushsize],tmpreg));
            end
          else
            list.concat(taicpu.op_ref(A_PUSH,TCgsize2opsize[pushsize],href));
        end;

      var
        len : aint;
        href : treference;
      begin
        { cgpara.size=OS_NO requires a copy on the stack }
        if use_push(cgpara) then
          begin
            if tcgsize2size[cgpara.size]<>tcgsize2size[size] then
              internalerror(200501161);
            { Record copy? }
            if (cgpara.size=OS_NO) then
              begin
                cgpara.check_simple_location;
                len:=align(cgpara.intsize,cgpara.alignment);
                g_stackpointer_alloc(list,len);
                reference_reset_base(href,NR_STACK_POINTER_REG,0);
                g_concatcopy(list,r,href,len);
              end
            else
              begin
                { We need to push the data in reverse order,
                  therefor we use a recursive algorithm }
                pushdata(cgpara.location,0);
              end
          end
        else
          inherited a_param_ref(list,size,r,cgpara);
      end;


    procedure tcg386.a_paramaddr_ref(list : taasmoutput;const r : treference;const cgpara : tcgpara);
      var
        tmpreg : tregister;
        opsize : topsize;
      begin
        with r do
          begin
            if (segment<>NR_NO) then
              cgmessage(cg_e_cant_use_far_pointer_there);
            if use_push(cgpara) then
              begin
                cgpara.check_simple_location;
                opsize:=tcgsize2opsize[OS_ADDR];
                if (base=NR_NO) and (index=NR_NO) then
                  begin
                    if assigned(symbol) then
                      list.concat(Taicpu.Op_sym_ofs(A_PUSH,opsize,symbol,offset))
                    else
                      list.concat(Taicpu.Op_const(A_PUSH,opsize,offset));
                  end
                else if (base=NR_NO) and (index<>NR_NO) and
                        (offset=0) and (scalefactor=0) and (symbol=nil) then
                  list.concat(Taicpu.Op_reg(A_PUSH,opsize,index))
                else if (base<>NR_NO) and (index=NR_NO) and
                        (offset=0) and (symbol=nil) then
                  list.concat(Taicpu.Op_reg(A_PUSH,opsize,base))
                else
                  begin
                    tmpreg:=getaddressregister(list);
                    a_loadaddr_ref_reg(list,r,tmpreg);
                    list.concat(taicpu.op_reg(A_PUSH,opsize,tmpreg));
                  end;
              end
            else
              inherited a_paramaddr_ref(list,r,cgpara);
          end;
      end;


    procedure tcg386.g_proc_exit(list : taasmoutput;parasize:longint;nostackframe:boolean);
      var
        stacksize : longint;
      begin
        { Release PIC register }
        if cs_create_pic in aktmoduleswitches then
          list.concat(tai_regalloc.dealloc(NR_PIC_OFFSET_REG,nil));

        { MMX needs to call EMMS }
        if assigned(rg[R_MMXREGISTER]) and
           (rg[R_MMXREGISTER].uses_registers) then
          list.concat(Taicpu.op_none(A_EMMS,S_NO));

        { remove stackframe }
        if not nostackframe then
          begin
            if (current_procinfo.framepointer=NR_STACK_POINTER_REG) then
              begin
                stacksize:=current_procinfo.calc_stackframe_size;
                if (stacksize<>0) then
                  cg.a_op_const_reg(list,OP_ADD,OS_ADDR,stacksize,current_procinfo.framepointer);
              end
            else
              list.concat(Taicpu.op_none(A_LEAVE,S_NO));
            list.concat(tai_regalloc.dealloc(NR_FRAME_POINTER_REG,nil));
          end;

        { return from proc }
        if (po_interrupt in current_procinfo.procdef.procoptions) then
          begin
            if (current_procinfo.procdef.funcretloc[calleeside].loc<>LOC_VOID) and
               (current_procinfo.procdef.funcretloc[calleeside].loc=LOC_REGISTER) then
              list.concat(Taicpu.Op_const_reg(A_ADD,S_L,4,NR_ESP))
            else
              list.concat(Taicpu.Op_reg(A_POP,S_L,NR_EAX));
            list.concat(Taicpu.Op_reg(A_POP,S_L,NR_EBX));
            list.concat(Taicpu.Op_reg(A_POP,S_L,NR_ECX));

            if (current_procinfo.procdef.funcretloc[calleeside].loc=LOC_REGISTER) and
               (current_procinfo.procdef.funcretloc[calleeside].size in [OS_64,OS_S64]) then
              list.concat(Taicpu.Op_const_reg(A_ADD,S_L,4,NR_ESP))
            else
              list.concat(Taicpu.Op_reg(A_POP,S_L,NR_EDX));

            list.concat(Taicpu.Op_reg(A_POP,S_L,NR_ESI));
            list.concat(Taicpu.Op_reg(A_POP,S_L,NR_EDI));
            { .... also the segment registers }
            list.concat(Taicpu.Op_reg(A_POP,S_W,NR_DS));
            list.concat(Taicpu.Op_reg(A_POP,S_W,NR_ES));
            list.concat(Taicpu.Op_reg(A_POP,S_W,NR_FS));
            list.concat(Taicpu.Op_reg(A_POP,S_W,NR_GS));
            { this restores the flags }
            list.concat(Taicpu.Op_none(A_IRET,S_NO));
          end
        { Routines with the poclearstack flag set use only a ret }
        else if current_procinfo.procdef.proccalloption in clearstack_pocalls then
         begin
           { complex return values are removed from stack in C code PM }
           if paramanager.ret_in_param(current_procinfo.procdef.rettype.def,
                                       current_procinfo.procdef.proccalloption) then
             list.concat(Taicpu.Op_const(A_RET,S_NO,sizeof(aint)))
           else
             list.concat(Taicpu.Op_none(A_RET,S_NO));
         end
        { ... also routines with parasize=0 }
        else if (parasize=0) then
         list.concat(Taicpu.Op_none(A_RET,S_NO))
        else
         begin
           { parameters are limited to 65535 bytes because ret allows only imm16 }
           if (parasize>65535) then
             CGMessage(cg_e_parasize_too_big);
           list.concat(Taicpu.Op_const(A_RET,S_NO,parasize));
         end;
      end;


    procedure tcg386.g_copyvaluepara_openarray(list : taasmoutput;const ref:treference;const lenloc:tlocation;elesize:aint;destreg:tregister);
      var
        power,len  : longint;
        opsize : topsize;
{$ifndef __NOWINPECOFF__}
        again,ok : tasmlabel;
{$endif}
      begin
        { get stack space }
        getcpuregister(list,NR_EDI);
        a_load_loc_reg(list,OS_INT,lenloc,NR_EDI);
        list.concat(Taicpu.op_reg(A_INC,S_L,NR_EDI));
        if (elesize<>1) then
         begin
           if ispowerof2(elesize, power) then
             list.concat(Taicpu.op_const_reg(A_SHL,S_L,power,NR_EDI))
           else
             list.concat(Taicpu.op_const_reg(A_IMUL,S_L,elesize,NR_EDI));
         end;
{$ifndef __NOWINPECOFF__}
        { windows guards only a few pages for stack growing, }
        { so we have to access every page first              }
        if target_info.system=system_i386_win32 then
          begin
             objectlibrary.getlabel(again);
             objectlibrary.getlabel(ok);
             a_label(list,again);
             list.concat(Taicpu.op_const_reg(A_CMP,S_L,winstackpagesize,NR_EDI));
             a_jmp_cond(list,OC_B,ok);
             list.concat(Taicpu.op_const_reg(A_SUB,S_L,winstackpagesize-4,NR_ESP));
             list.concat(Taicpu.op_reg(A_PUSH,S_L,NR_EDI));
             list.concat(Taicpu.op_const_reg(A_SUB,S_L,winstackpagesize,NR_EDI));
             a_jmp_always(list,again);

             a_label(list,ok);
             list.concat(Taicpu.op_reg_reg(A_SUB,S_L,NR_EDI,NR_ESP));
             ungetcpuregister(list,NR_EDI);
             { now reload EDI }
             getcpuregister(list,NR_EDI);
             a_load_loc_reg(list,OS_INT,lenloc,NR_EDI);
             list.concat(Taicpu.op_reg(A_INC,S_L,NR_EDI));

             if (elesize<>1) then
              begin
                if ispowerof2(elesize, power) then
                  list.concat(Taicpu.op_const_reg(A_SHL,S_L,power,NR_EDI))
                else
                  list.concat(Taicpu.op_const_reg(A_IMUL,S_L,elesize,NR_EDI));
              end;
          end
        else
{$endif __NOWINPECOFF__}
          list.concat(Taicpu.op_reg_reg(A_SUB,S_L,NR_EDI,NR_ESP));
        { align stack on 4 bytes }
        list.concat(Taicpu.op_const_reg(A_AND,S_L,aint($fffffff4),NR_ESP));
        { load destination, don't use a_load_reg_reg, that will add a move instruction
          that can confuse the reg allocator }
        list.concat(Taicpu.Op_reg_reg(A_MOV,S_L,NR_ESP,NR_EDI));

        { Allocate other registers }
        getcpuregister(list,NR_ECX);
        getcpuregister(list,NR_ESI);

        { load count }
        a_load_loc_reg(list,OS_INT,lenloc,NR_ECX);

        { load source }
        a_loadaddr_ref_reg(list,ref,NR_ESI);

        { scheduled .... }
        list.concat(Taicpu.op_reg(A_INC,S_L,NR_ECX));

        { calculate size }
        len:=elesize;
        opsize:=S_B;
        if (len and 3)=0 then
         begin
           opsize:=S_L;
           len:=len shr 2;
         end
        else
         if (len and 1)=0 then
          begin
            opsize:=S_W;
            len:=len shr 1;
          end;

        if len<>0 then
          begin
            if ispowerof2(len, power) then
              list.concat(Taicpu.op_const_reg(A_SHL,S_L,power,NR_ECX))
            else
              list.concat(Taicpu.op_const_reg(A_IMUL,S_L,len,NR_ECX));
          end;
        list.concat(Taicpu.op_none(A_REP,S_NO));
        case opsize of
          S_B : list.concat(Taicpu.Op_none(A_MOVSB,S_NO));
          S_W : list.concat(Taicpu.Op_none(A_MOVSW,S_NO));
          S_L : list.concat(Taicpu.Op_none(A_MOVSD,S_NO));
        end;
        ungetcpuregister(list,NR_EDI);
        ungetcpuregister(list,NR_ECX);
        ungetcpuregister(list,NR_ESI);

        { patch the new address, but don't use a_load_reg_reg, that will add a move instruction
          that can confuse the reg allocator }
        list.concat(Taicpu.Op_reg_reg(A_MOV,S_L,NR_ESP,destreg));
      end;


    procedure tcg386.g_exception_reason_save(list : taasmoutput; const href : treference);
      begin
        list.concat(Taicpu.op_reg(A_PUSH,tcgsize2opsize[OS_INT],NR_FUNCTION_RESULT_REG));
      end;


    procedure tcg386.g_exception_reason_save_const(list : taasmoutput;const href : treference; a: aint);
      begin
        list.concat(Taicpu.op_const(A_PUSH,tcgsize2opsize[OS_INT],a));
      end;


    procedure tcg386.g_exception_reason_load(list : taasmoutput; const href : treference);
      begin
        list.concat(Taicpu.op_reg(A_POP,tcgsize2opsize[OS_INT],NR_FUNCTION_RESULT_REG));
      end;


{ ************* 64bit operations ************ }

    procedure tcg64f386.get_64bit_ops(op:TOpCG;var op1,op2:TAsmOp);
      begin
        case op of
          OP_ADD :
            begin
              op1:=A_ADD;
              op2:=A_ADC;
            end;
          OP_SUB :
            begin
              op1:=A_SUB;
              op2:=A_SBB;
            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 tcg64f386.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,S_L,ref,reg.reglo));
        tempref:=ref;
        inc(tempref.offset,4);
        list.concat(taicpu.op_ref_reg(op2,S_L,tempref,reg.reghi));
      end;


    procedure tcg64f386.a_op64_reg_reg(list : taasmoutput;op:TOpCG;regsrc,regdst : tregister64);
      var
        op1,op2 : TAsmOp;
      begin
        case op of
          OP_NEG :
            begin
              if (regsrc.reglo<>regdst.reglo) then
                a_load64_reg_reg(list,regsrc,regdst);
              list.concat(taicpu.op_reg(A_NOT,S_L,regdst.reghi));
              list.concat(taicpu.op_reg(A_NEG,S_L,regdst.reglo));
              list.concat(taicpu.op_const_reg(A_SBB,S_L,-1,regdst.reghi));
              exit;
            end;
          OP_NOT :
            begin
              if (regsrc.reglo<>regdst.reglo) then
                a_load64_reg_reg(list,regsrc,regdst);
              list.concat(taicpu.op_reg(A_NOT,S_L,regdst.reghi));
              list.concat(taicpu.op_reg(A_NOT,S_L,regdst.reglo));
              exit;
            end;
        end;
        get_64bit_ops(op,op1,op2);
        list.concat(taicpu.op_reg_reg(op1,S_L,regsrc.reglo,regdst.reglo));
        list.concat(taicpu.op_reg_reg(op2,S_L,regsrc.reghi,regdst.reghi));
      end;


    procedure tcg64f386.a_op64_const_reg(list : taasmoutput;op:TOpCG;value : int64;reg : tregister64);
      var
        op1,op2 : TAsmOp;
      begin
        case op of
          OP_AND,OP_OR,OP_XOR:
            begin
              cg.a_op_const_reg(list,op,OS_32,aint(lo(value)),reg.reglo);
              cg.a_op_const_reg(list,op,OS_32,aint(hi(value)),reg.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,S_L,aint(lo(value)),reg.reglo));
              list.concat(taicpu.op_const_reg(op2,S_L,aint(hi(value)),reg.reghi));
            end;
          else
            internalerror(200204021);
        end;
      end;


    procedure tcg64f386.a_op64_const_ref(list : taasmoutput;op:TOpCG;value : int64;const ref : treference);
      var
        op1,op2 : TAsmOp;
        tempref : treference;
      begin
        case op of
          OP_AND,OP_OR,OP_XOR:
            begin
              cg.a_op_const_ref(list,op,OS_32,lo(value),ref);
              tempref:=ref;
              inc(tempref.offset,4);
              cg.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,S_L,lo(value),ref));
              tempref:=ref;
              inc(tempref.offset,4);
              list.concat(taicpu.op_const_ref(op2,S_L,hi(value),tempref));
            end;
          else
            internalerror(200204022);
        end;
      end;

begin
  cg := tcg386.create;
  cg64 := tcg64f386.create;
end.
{
  $Log$
  Revision 1.63  2005-01-18 22:19:20  peter
    * multiple location support for i386 a_param_ref
    * remove a_param_copy_ref for i386

  Revision 1.62  2004/11/21 17:54:59  peter
    * ttempcreatenode.create_reg merged into .create with parameter
      whether a register is allowed
    * funcret_paraloc renamed to funcretloc

  Revision 1.61  2004/11/21 17:17:04  florian
    * changed funcret location back to tlocation

  Revision 1.60  2004/10/31 21:45:03  peter
    * generic tlocation
    * move tlocation to cgutils

  Revision 1.59  2004/10/24 20:01:08  peter
    * remove saveregister calling convention

  Revision 1.58  2004/10/24 11:44:28  peter
    * small regvar fixes
    * loadref parameter removed from concatcopy,incrrefcount,etc

  Revision 1.57  2004/10/15 09:16:21  mazen
  - remove $IFDEF DELPHI and related code
  - remove $IFDEF FPCPROCVAR and related code

  Revision 1.56  2004/10/13 21:12:51  peter
    * -Or fixes for open array

  Revision 1.55  2004/10/11 15:46:45  peter
    * length parameter for copyvaluearray changed to tlocation

  Revision 1.54  2004/10/05 20:41:01  peter
    * more spilling rewrites

  Revision 1.53  2004/09/25 14:23:54  peter
    * ungetregister is now only used for cpuregisters, renamed to
      ungetcpuregister
    * renamed (get|unget)explicitregister(s) to ..cpuregister
    * removed location-release/reference_release

  Revision 1.52  2004/09/21 17:25:12  peter
    * paraloc branch merged

  Revision 1.51.4.1  2004/08/31 20:43:06  peter
    * paraloc patch

  Revision 1.51  2004/07/09 23:30:13  jonas
    *  changed first_sse_imreg to first_mm_imreg

  Revision 1.50  2004/06/20 08:55:31  florian
    * logs truncated

  Revision 1.49  2004/06/16 20:07:10  florian
    * dwarf branch merged

  Revision 1.48  2004/04/09 14:36:05  peter
    * A_MOVSL renamed to A_MOVSD

  Revision 1.47.2.9  2004/05/30 10:45:50  peter
    * merged fixes from main branch

  Revision 1.47.2.8  2004/05/02 21:34:01  florian
    * i386 compilation fixed

  Revision 1.47.2.7  2004/05/02 12:45:32  peter
    * enabled cpuhasfixedstack for x86-64 again
    * fixed size of temp allocation for parameters

}