fpc/compiler/sparc/ncpucnv.pas

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

    Generate SPARC assembler for type converting nodes

    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 ncpucnv;

{$i fpcdefs.inc}

interface

    uses
      node,ncnv,ncgcnv,defcmp;

    type
       TSparcTypeConvNode = class(TCgTypeConvNode)
         protected
         { procedure second_int_to_int;override; }
         { procedure second_string_to_string;override; }
         { procedure second_cstring_to_pchar;override; }
         { procedure second_string_to_chararray;override; }
         { procedure second_array_to_pointer;override; }
          function first_int_to_real: tnode; override;
         { procedure second_pointer_to_array;override; }
         { procedure second_chararray_to_string;override; }
         { procedure second_char_to_string;override; }
          procedure second_int_to_real;override;
          procedure second_real_to_real;override;
         { procedure second_cord_to_pointer;override; }
         { procedure second_proc_to_procvar;override; }
         { procedure second_bool_to_int;override; }
          procedure second_int_to_bool;override;
         { procedure second_load_smallset;override;  }
         { procedure second_ansistring_to_pchar;override; }
         { procedure second_pchar_to_string;override; }
         { procedure second_class_to_intf;override; }
         { procedure second_char_to_char;override; }
          procedure pass_2;override;
          procedure second_call_helper(c : tconverttype); override;
       end;

implementation

   uses
      verbose,globals,systems,
      symconst,symdef,aasmbase,aasmtai,
      defutil,
      cgbase,pass_1,pass_2,
      ncon,ncal,
      ncgutil,
      cpubase,aasmcpu,
      rgobj,tgobj,cgobj,cginfo;


{*****************************************************************************
                             FirstTypeConv
*****************************************************************************}

    function TSparctypeconvnode.first_int_to_real: tnode;
      var
        fname: string[19];
      begin
        { converting a 64bit integer to a float requires a helper }
        if is_64bitint(left.resulttype.def) then
          begin
            if is_signed(left.resulttype.def) then
              fname := 'fpc_int64_to_double'
            else
              fname := 'fpc_qword_to_double';
            result := ccallnode.createintern(fname,ccallparanode.create(
              left,nil));
            left:=nil;
            firstpass(result);
            exit;
          end
        else
          { other integers are supposed to be 32 bit }
          begin
            if is_signed(left.resulttype.def) then
              inserttypeconv(left,s32bittype)
            else
              inserttypeconv(left,u32bittype);
            firstpass(left);
          end;
        result := nil;
        if registersfpu<1 then
          registersfpu:=1;
        location.loc:=LOC_FPUREGISTER;
      end;


{*****************************************************************************
                             SecondTypeConv
*****************************************************************************}

procedure TSparctypeconvnode.second_int_to_real;
  type
    tdummyarray = packed array[0..7] of byte;
{$ifdef VER1_0}
  var
    dummy1, dummy2: int64;
{$else VER1_0}
  const
    dummy1: int64 = $4330000080000000;
    dummy2: int64 = $4330000000000000;
{$endif VER1_0}
  var
    tempconst: trealconstnode;
    ref: treference;
    valuereg, tempreg, leftreg, tmpfpureg: tregister;
    signed, valuereg_is_scratch: boolean;
  begin
{$ifdef VER1_0}
    { the "and" is because 1.0.x will sign-extend the $80000000 to }
    { $ffffffff80000000 when converting it to int64 (JM)           }
    dummy1 := int64($80000000) and (int64($43300000) shl 32);
    dummy2 := int64($43300000) shl 32;
{$endif VER1_0}
    valuereg_is_scratch := false;
    location_reset(location,LOC_FPUREGISTER,def_cgsize(resulttype.def));
    { the code here comes from the PowerPC Compiler Writer's Guide }
    { * longint to double                               }
    { addis R0,R0,0x4330  # R0 = 0x43300000             }
    { stw R0,disp(R1)     # store upper half            }
    { xoris R3,R3,0x8000  # flip sign bit               }
    { stw R3,disp+4(R1)   # store lower half            }
    { lfd FR1,disp(R1)    # float load double of value  }
    { fsub FR1,FR1,FR2    # subtract 0x4330000080000000 }
    { * cardinal to double                              }
    { addis R0,R0,0x4330  # R0 = 0x43300000             }
    { stw R0,disp(R1)     # store upper half            }
    { stw R3,disp+4(R1)   # store lower half            }
    { lfd FR1,disp(R1)    # float load double of value  }
    { fsub FR1,FR1,FR2    # subtract 0x4330000000000000 }
    tg.Gettemp(exprasmlist,8,tt_normal,ref);
    signed := is_signed(left.resulttype.def);
    { we need a certain constant for the conversion, so create it here }
    if signed
    then
      tempconst:=crealconstnode.create(double(dummy1),pbestrealtype^)
    else
      tempconst:=crealconstnode.create(double(dummy2),pbestrealtype^);
    resulttypepass(tempconst);
    firstpass(tempconst);
    secondpass(tempconst);
    if (tempconst.location.loc <> LOC_CREFERENCE)or
    { has to be handled by a helper }
       is_64bitint(left.resulttype.def)
    then
      internalerror(200110011);
    case left.location.loc of
      LOC_REGISTER:
        begin
          leftreg := left.location.register;
          valuereg := leftreg;
        end;
      LOC_CREGISTER:
        begin
          leftreg := left.location.register;
          if signed
          then
            begin
              valuereg := cg.get_scratch_reg_int(exprasmlist,OS_INT);
              valuereg_is_scratch := true;
            end
          else
            valuereg := leftreg;
        end;
      LOC_REFERENCE,LOC_CREFERENCE:
        begin
          leftreg := cg.get_scratch_reg_int(exprasmlist,OS_INT);
          valuereg := leftreg;
          valuereg_is_scratch := true;
          cg.a_load_ref_reg(exprasmlist,def_cgsize(left.resulttype.def),
          left.location.reference,leftreg);
        end
      else
        internalerror(200110012);
    end;
      tempreg := cg.get_scratch_reg_int(exprasmlist,OS_32);
      {$WARNING FIXME what really should be done?}
      exprasmlist.concat(taicpu.op_reg_const_reg(A_OR,tempreg,$4330,tempreg));
      cg.a_load_reg_ref(exprasmlist,OS_32,tempreg,ref);
      cg.free_scratch_reg(exprasmlist,tempreg);
      if signed
      then
        {$WARNING FIXME what really should be done?}
        exprasmlist.concat(taicpu.op_reg_const_reg(A_XOR,leftreg,$8000,valuereg));
      inc(ref.offset,4);
      cg.a_load_reg_ref(exprasmlist,OS_32,valuereg,ref);
      dec(ref.offset,4);
      if (valuereg_is_scratch)
      then
        cg.free_scratch_reg(exprasmlist,valuereg);
      if(left.location.loc = LOC_REGISTER) or
        ((left.location.loc = LOC_CREGISTER) and not signed)
      then
        rg.UnGetRegisterInt(exprasmlist,leftreg)
      else
        cg.free_scratch_reg(exprasmlist,valuereg);
      tmpfpureg := rg.getregisterfpu(exprasmlist);
      cg.a_loadfpu_ref_reg(exprasmlist,OS_F64,tempconst.location.reference,tmpfpureg);
      tempconst.free;
      location.register := rg.getregisterfpu(exprasmlist);
      {$WARNING FIXME what really should be done?}
      exprasmlist.concat(taicpu.op_Ref_Reg(A_LDF,Ref,location.register));
      tg.ungetiftemp(exprasmlist,ref);
      exprasmlist.concat(taicpu.op_reg_reg_reg(A_SUB,location.register,location.register,tmpfpureg));
      rg.ungetregisterfpu(exprasmlist,tmpfpureg);
      { work around bug in some PowerPC processors }
      if (tfloatdef(resulttype.def).typ = s32real)
      then
        {$WARNING FIXME what really should be done?}
        exprasmlist.concat(taicpu.op_reg_reg(A_ADD,location.register,location.register));
  end;
procedure TSparctypeconvnode.second_real_to_real;
  begin
    inherited second_real_to_real;
    { work around bug in some powerpc processors where doubles aren't }
    { properly converted to singles                                   }
    if(tfloatdef(left.resulttype.def).typ = s64real)and
      (tfloatdef(resulttype.def).typ = s32real)
    then
      {$WARNING FIXME what really should be done?}
      exprasmlist.concat(taicpu.op_reg_reg(A_ADD,location.register,location.register));
  end;
procedure TSparctypeconvnode.second_int_to_bool;
  var
    hreg1,hreg2:tregister;
    resflags : tresflags;
    opsize   : tcgsize;
  begin
    { byte(boolean) or word(wordbool) or longint(longbool) must }
    { be accepted for var parameters                            }
    if(nf_explicit in flags)and
      (left.resulttype.def.size=resulttype.def.size)and
      (left.location.loc in [LOC_REFERENCE,LOC_CREFERENCE,LOC_CREGISTER])
    then
      begin
        location_copy(location,left.location);
        exit;
      end;
    location_reset(location,LOC_REGISTER,def_cgsize(left.resulttype.def));
    opsize := def_cgsize(left.resulttype.def);
    case left.location.loc of
      LOC_CREFERENCE,LOC_REFERENCE,LOC_REGISTER,LOC_CREGISTER:
        begin
          if left.location.loc in [LOC_CREFERENCE,LOC_REFERENCE]
          then
            begin
              reference_release(exprasmlist,left.location.reference);
              hreg2:=rg.getregisterint(exprasmlist,opsize);
              cg.a_load_ref_reg(exprasmlist,opsize,left.location.reference,hreg2);
            end
          else
            hreg2 := left.location.register;
            hreg1 := rg.getregisterint(exprasmlist,opsize);
            exprasmlist.concat(taicpu.op_reg_const_reg(A_SUB,hreg1,1,hreg2));
            exprasmlist.concat(taicpu.op_reg_reg_reg(A_SUB,hreg1,hreg1,hreg2));
            rg.UnGetRegisterInt(exprasmlist,hreg2);
        end;
      LOC_FLAGS :
        begin
          hreg1:=rg.getregisterint(exprasmlist,location.size);
          resflags:=left.location.resflags;
          cg.g_flags2reg(exprasmlist,location.size,resflags,hreg1);
        end;
      else
        internalerror(10062);
    end;
    location.register := hreg1;
  end;
procedure TSparctypeconvnode.second_call_helper(c : tconverttype);
  const
    secondconvert : array[tconverttype] of pointer = (
      @second_nothing, {equal}
      @second_nothing, {not_possible}
      @second_nothing, {second_string_to_string, handled in resulttype pass }
      @second_char_to_string,
      @second_nothing, {char_to_charray}
      @second_nothing, { pchar_to_string, handled in resulttype pass }
      @second_nothing, {cchar_to_pchar}
      @second_cstring_to_pchar,
      @second_ansistring_to_pchar,
      @second_string_to_chararray,
      @second_nothing, { chararray_to_string, handled in resulttype pass }
      @second_array_to_pointer,
      @second_pointer_to_array,
      @second_int_to_int,
      @second_int_to_bool,
      @second_bool_to_int, { bool_to_bool }
      @second_bool_to_int,
      @second_real_to_real,
      @second_int_to_real,
      @second_nothing, { currency_to_real, handled in resulttype pass }
      @second_proc_to_procvar,
      @second_nothing, { arrayconstructor_to_set }
      @second_nothing, { second_load_smallset, handled in first pass }
      @second_cord_to_pointer,
      @second_nothing, { interface 2 string }
      @second_nothing, { interface 2 guid   }
      @second_class_to_intf,
      @second_char_to_char,
      @second_nothing,  { normal_2_smallset }
      @second_nothing,   { dynarray_2_openarray }
      @second_nothing,
      {$ifdef fpc}@{$endif}second_nothing,  { variant_2_dynarray }
      {$ifdef fpc}@{$endif}second_nothing   { dynarray_2_variant}
    );
    type
      tprocedureofobject = procedure of object;
      var
        r:packed record
            proc : pointer;
            obj : pointer;
          end;
      begin
        { this is a little bit dirty but it works }
        { and should be quite portable too        }
        r.proc:=secondconvert[c];
        r.obj:=self;
        tprocedureofobject(r){$ifdef FPC}();{$endif FPC}
      end;
procedure TSparctypeconvnode.pass_2;
{$ifdef TESTOBJEXT2}
  var
    r : preference;
    nillabel : plabel;
{$endif TESTOBJEXT2}
  begin
    { this isn't good coding, I think tc_bool_2_int, shouldn't be }
    { type conversion (FK)                                 }
    if not(convtype in [tc_bool_2_int,tc_bool_2_bool])
    then
      begin
        secondpass(left);
        location_copy(location,left.location);
        if codegenerror
        then
          exit;
      end;
      second_call_helper(convtype);
  end;
begin
   ctypeconvnode:=TSparctypeconvnode;
end.
{
  $Log$
  Revision 1.15  2003-04-23 21:10:54  peter
    * fix compile for ppc,sparc,m68k

  Revision 1.14  2003/04/23 13:35:39  peter
    * fix sparc compile

  Revision 1.13  2003/03/10 21:59:54  mazen
  * fixing index overflow in handling new registers arrays.

  Revision 1.12  2003/02/19 22:00:17  daniel
    * Code generator converted to new register notation
    - Horribily outdated todo.txt removed

  Revision 1.11  2003/01/22 20:45:15  mazen
  * making math code in RTL compiling.
  *NB : This does NOT mean necessary that it will generate correct code!

  Revision 1.10  2003/01/20 22:21:36  mazen
  * many stuff related to RTL fixed

  Revision 1.9  2002/12/05 14:28:03  florian
    * some variant <-> dyn. array stuff

  Revision 1.8  2002/11/25 17:43:28  peter
    * splitted defbase in defutil,symutil,defcmp
    * merged isconvertable and is_equal into compare_defs(_ext)
    * made operator search faster by walking the list only once

  Revision 1.7  2002/11/10 19:07:46  mazen
  * SPARC calling mechanism almost OK (as in GCC./mppcsparc )

  Revision 1.6  2002/11/06 11:31:24  mazen
  * op_reg_reg_reg don't need any more a TOpSize parameter

  Revision 1.5  2002/10/22 13:43:01  mazen
  - cga.pas redueced to an empty unit

  Revision 1.4  2002/10/10 19:57:52  mazen
  * Just to update repsitory

  Revision 1.3  2002/09/07 15:25:14  peter
    * old logs removed and tabs fixed

  Revision 1.2  2002/08/30 06:15:27  mazen
  ncgcall.pas moved to ncpucall.pas (I'd like ncpu* insteade of nsparc* since it
  provides processor independent units naming)

  Revision 1.1  2002/08/29 10:16:20  mazen
  File added support to the new generic parameter handling

  Revision 1.24  2002/08/23 16:14:50  peter
    * tempgen cleanup
    * tt_noreuse temp type added that will be used in genentrycode

  Revision 1.23  2002/08/18 10:34:30  florian
    * more ppc assembling fixes

  Revision 1.22  2002/08/14 19:30:42  carl
    + added fixing because first_in_to_real is now completely generic

  Revision 1.21  2002/08/11 06:14:41  florian
    * fixed powerpc compilation problems

  Revision 1.20  2002/08/10 17:15:31  jonas
    * various fixes and optimizations

  Revision 1.19  2002/07/29 21:23:44  florian
    * more fixes for the ppc
    + wrappers for the tcnvnode.first_* stuff introduced

  Revision 1.18  2002/07/29 09:20:20  jonas
    + second_int_to_int implementation which is almost the same as the
      generic implementation, but it avoids some unnecessary type conversions

  Revision 1.17  2002/07/27 19:55:15  jonas
    + generic implementation of tcg.g_flags2ref()
    * tcg.flags2xxx() now also needs a size parameter

  Revision 1.16  2002/07/24 14:38:00  florian
    * small typo fixed, compiles with 1.0.x again

  Revision 1.15  2002/07/21 16:57:22  jonas
    * hopefully final fix for second_int_to_real()

  Revision 1.14  2002/07/20 11:58:05  florian
    * types.pas renamed to defbase.pas because D6 contains a types
      unit so this would conflicts if D6 programms are compiled
    + Willamette/SSE2 instructions to assembler added

  Revision 1.13  2002/07/13 06:49:39  jonas
    * fixed fpu constants in second_int_to_real (fpu values are also stored
      in big endian)

  Revision 1.12  2002/07/12 22:02:22  florian
    * fixed to compile with 1.1

  Revision 1.11  2002/07/11 14:41:34  florian
    * start of the new generic parameter handling

  Revision 1.10  2002/07/11 07:42:31  jonas
    * fixed nppccnv and enabled it
    - removed PPC specific second_int_to_int and use the generic one instead

  Revision 1.9  2002/05/20 13:30:42  carl
  * bugfix of hdisponen (base must be set, not index)
  * more portability fixes

  Revision 1.8  2002/05/18 13:34:26  peter
    * readded missing revisions

  Revision 1.7  2002/05/16 19:46:53  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

}