freepascal.compiler/compiler/ncgmat.pas

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

    Generate generic mathematical 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 ncgmat;

{$i fpcdefs.inc}

interface

    uses
      node,nmat,cpubase,cgbase,cginfo;

type
      tcgunaryminusnode = class(tunaryminusnode)
         procedure pass_2;override;
      protected
         { This routine is called to change the sign of the
           floating point value in the floating point
           register r.

           This routine should be overriden, since
           the generic version is not optimal at all. The
           generic version assumes that floating
           point values are stored in the register
           in IEEE-754 format.
         }
         procedure emit_float_sign_change(r: tregister; _size : tcgsize);virtual;
      end;

      tcgmoddivnode = class(tmoddivnode)
         procedure pass_2;override;
      protected
         { This routine must do an actual 32-bit division, be it
           signed or unsigned. The result must set into the the
           @var(num) register.

           @param(signed Indicates if the division must be signed)
           @param(denum  Register containing the denominator
           @param(num    Register containing the numerator, will also receive result)

           The actual optimizations regarding shifts have already
           been done and emitted, so this should really a do a divide.
         }
         procedure emit_div_reg_reg(signed: boolean;denum,num : tregister);virtual;abstract;
         { This routine must do an actual 32-bit modulo, be it
           signed or unsigned. The result must set into the the
           @var(num) register.

           @param(signed Indicates if the modulo must be signed)
           @param(denum  Register containing the denominator
           @param(num    Register containing the numerator, will also receive result)

           The actual optimizations regarding shifts have already
           been done and emitted, so this should really a do a modulo.
         }
         procedure emit_mod_reg_reg(signed: boolean;denum,num : tregister);virtual;abstract;
         { This routine must do an actual 64-bit division, be it
           signed or unsigned. The result must set into the the
           @var(num) register.

           @param(signed Indicates if the division must be signed)
           @param(denum  Register containing the denominator
           @param(num    Register containing the numerator, will also receive result)

           The actual optimizations regarding shifts have already
           been done and emitted, so this should really a do a divide.
           Currently, this routine should only be implemented on
           64-bit systems, otherwise a helper is called in 1st pass.
         }
         procedure emit64_div_reg_reg(signed: boolean;denum,num : tregister64);virtual;
      end;

      tcgshlshrnode = class(tshlshrnode)
         procedure pass_2;override;
      end;


implementation

    uses
      globtype,systems,
      cutils,verbose,globals,
      symconst,symdef,aasmbase,aasmtai,aasmcpu,defbase,
      pass_1,pass_2,
      ncon,
      cpuinfo,
      tgobj,ncgutil,cgobj,rgobj,rgcpu,paramgr,cg64f32;

{*****************************************************************************
                          TCGUNARYMINUSNODE
*****************************************************************************}
    procedure tcgunaryminusnode.emit_float_sign_change(r: tregister; _size : tcgsize);
     var
       href : treference;
       hreg : tregister;
      begin
        { get a temporary memory reference to store the floating
          point value
        }
        tg.gettemp(exprasmlist,tcgsize2size[_size],tt_normal,href);
        { store the floating point value in the temporary memory area }
        cg.a_loadfpu_reg_ref(exprasmlist,_size,r,href);
        { only single and double ieee are supported }
        if _size = OS_F64 then
          begin
            { on little-endian machine the most significant
              32-bit value is stored at the highest address
            }
            if target_info.endian = endian_little then
              inc(href.offset,4);
          end
        else
        if _size <> OS_F32 then
           internalerror(20020814);
        hreg := rg.getregisterint(exprasmlist);
        { load value }
        cg.a_load_ref_reg(exprasmlist,OS_32,href,hreg);
        { bitwise complement copied value }
        cg.a_op_reg_reg(exprasmlist,OP_NOT,OS_32,hreg,hreg);
        { sign-bit is bit 31/63 of single/double }
        cg.a_op_const_reg(exprasmlist,OP_AND,$80000000,hreg);
        { or with value in reference memory }
        cg.a_op_reg_ref(exprasmlist,OP_OR,OS_32,hreg,href);
        rg.ungetregister(exprasmlist,hreg);
        { store the floating point value in the temporary memory area }
        if _size = OS_F64 then
          begin
            { on little-endian machine the most significant
              32-bit value is stored at the highest address
            }
            if target_info.endian = endian_little then
              dec(href.offset,4);
          end;
        cg.a_loadfpu_ref_reg(exprasmlist,_size,href,r);
      end;


    procedure tcgunaryminusnode.pass_2;


      begin
         if is_64bitint(left.resulttype.def) then
           begin
              secondpass(left);

              { load left operator in a register }
              location_copy(location,left.location);
              location_force_reg(exprasmlist,location,OS_64,false);
              cg64.a_op64_loc_reg(exprasmlist,OP_NEG,
                 location,joinreg64(location.registerlow,location.registerhigh));
           end
         else
           begin
              secondpass(left);
              location_reset(location,LOC_REGISTER,OS_INT);
              case left.location.loc of
                 LOC_REGISTER:
                   begin
                      location.register:=left.location.register;
                      cg.a_op_reg_reg(exprasmlist,OP_NEG,OS_INT,location.register,
                         location.register);
                   end;
                 LOC_CREGISTER:
                   begin
                      location.register:=rg.getregisterint(exprasmlist);
                      cg.a_load_reg_reg(exprasmlist,OS_INT,OS_INT,left.location.register,
                        location.register);
                      cg.a_op_reg_reg(exprasmlist,OP_NEG,OS_INT,location.register,
                         location.register);
                   end;
                 LOC_REFERENCE,
                 LOC_CREFERENCE:
                   begin
                      reference_release(exprasmlist,left.location.reference);
                      if (left.resulttype.def.deftype=floatdef) then
                        begin
                           location_reset(location,LOC_FPUREGISTER,def_cgsize(resulttype.def));
                           location.register:=rg.getregisterfpu(exprasmlist);
                           cg.a_loadfpu_ref_reg(exprasmlist,
                              def_cgsize(left.resulttype.def),
                              left.location.reference,location.register);
                           emit_float_sign_change(location.register,def_cgsize(left.resulttype.def));
                        end
                      else
                        begin
                           location.register:=rg.getregisterint(exprasmlist);
                           { why is the size is OS_INT, since in pass_1 we convert
                             everything to a signed natural value anyways
                           }
                           cg.a_load_ref_reg(exprasmlist,OS_INT,
                               left.location.reference,location.register);
                           cg.a_op_reg_reg(exprasmlist,OP_NEG,OS_INT,location.register,
                               location.register);
                        end;
                   end;
                 LOC_FPUREGISTER:
                   begin
                      location_reset(location,LOC_FPUREGISTER,def_cgsize(resulttype.def));
                      location.register:=left.location.register;
                      emit_float_sign_change(location.register,def_cgsize(left.resulttype.def));
                   end;
                 LOC_CFPUREGISTER:
                   begin
                      location_reset(location,LOC_FPUREGISTER,def_cgsize(resulttype.def));
                      location.register:=rg.getregisterfpu(exprasmlist);
                      cg.a_loadfpu_reg_reg(exprasmlist,left.location.register,location.register);
                      emit_float_sign_change(location.register,def_cgsize(left.resulttype.def));
                   end;
                 else
                    internalerror(200203225);
              end;
           end;
      end;


{*****************************************************************************
                             TCGMODDIVNODE
*****************************************************************************}

    procedure tcgmoddivnode.emit64_div_reg_reg(signed: boolean; denum,num:tregister64);
      begin
        { handled in pass_1 already, unless pass_1 is
          overriden
        }
        { should be handled in pass_1 (JM) }
        internalerror(200109052);
      end;


    procedure tcgmoddivnode.pass_2;
      var
         hreg1 : tregister;
         hdenom,hnumerator : tregister;
         shrdiv,popeax,popedx : boolean;
         power : longint;
         hl : tasmlabel;
         pushedregs : tmaybesave;
      begin
         shrdiv := false;
         secondpass(left);
         if codegenerror then
          exit;
         maybe_save(exprasmlist,right.registers32,left.location,pushedregs);
         secondpass(right);
         maybe_restore(exprasmlist,left.location,pushedregs);
         if codegenerror then
          exit;
         location_copy(location,left.location);

         if is_64bitint(resulttype.def) then
           begin
             { this code valid for 64-bit cpu's only ,
               otherwise helpers are called in pass_1
             }
             location_force_reg(exprasmlist,location,OS_64,false);
             location_copy(location,left.location);
             location_force_reg(exprasmlist,right.location,OS_64,false);
             emit64_div_reg_reg(is_signed(left.resulttype.def),
               joinreg64(right.location.registerlow,right.location.registerhigh),
               joinreg64(location.registerlow,location.registerhigh));
           end
         else
           begin
              { put numerator in register }
              location_force_reg(exprasmlist,left.location,OS_INT,false);
              hreg1:=left.location.register;

              if (nodetype=divn) and
                 (right.nodetype=ordconstn) and
                 ispowerof2(tordconstnode(right).value,power) then
                Begin
                  shrdiv := true;
                  { for signed numbers, the numerator must be adjusted before the
                    shift instruction, but not wih unsigned numbers! Otherwise,
                    "Cardinal($ffffffff) div 16" overflows! (JM) }
                  If is_signed(left.resulttype.def) Then
                    Begin
                      objectlibrary.getlabel(hl);
                      cg.a_cmp_const_reg_label(exprasmlist,OS_INT,OC_GT,0,hreg1,hl);
                      if power=1 then
                          cg.a_op_const_reg(exprasmlist,OP_ADD,1,hreg1)
                      else
                          cg.a_op_const_reg(exprasmlist,OP_ADD,
                             tordconstnode(right).value-1,hreg1);
                      cg.a_label(exprasmlist,hl);
                      cg.a_op_const_reg(exprasmlist,OP_SAR,power,hreg1);
                      End
                    Else { not signed }
                     Begin
                      cg.a_op_const_reg(exprasmlist,OP_SHR,power,hreg1);
                     end;
                End
              else
                begin
                  { bring denominator to hdenom }
                  { hdenom is always free, it's }
                  { only used for temporary }
                  { purposes                }
                  hdenom := rg.getregisterint(exprasmlist);
                  if right.location.loc<>LOC_CREGISTER then
                   location_release(exprasmlist,right.location);
                  cg.a_load_loc_reg(exprasmlist,right.location,hdenom);
                  { verify if the divisor is zero, if so return an error
                    immediately
                  }
                  objectlibrary.getlabel(hl);
                  cg.a_cmp_const_reg_label(exprasmlist,OS_INT,OC_NE,0,hdenom,hl);
                  cg.a_param_const(exprasmlist,OS_S32,200,paramanager.getintparaloc(1));
                  cg.a_call_name(exprasmlist,'FPC_HANDLERROR');
                  cg.a_label(exprasmlist,hl);
                  if nodetype = modn then
                    emit_mod_reg_reg(is_signed(left.resulttype.def),hdenom,hreg1)
                  else
                    emit_div_reg_reg(is_signed(left.resulttype.def),hdenom,hreg1);
                end;
              location_reset(location,LOC_REGISTER,OS_INT);
              location.register:=hreg1;
           end;
        cg.g_overflowcheck(exprasmlist,self);
      end;


{*****************************************************************************
                             TCGSHLRSHRNODE
*****************************************************************************}


    procedure tcgshlshrnode.pass_2;
      var
         hcountreg : tregister;
         op : topcg;
         l1,l2,l3 : tasmlabel;
         pushedregs : tmaybesave;
         freescratch : boolean;
      begin
         freescratch:=false;
         secondpass(left);
         maybe_save(exprasmlist,right.registers32,left.location,pushedregs);
         secondpass(right);
         maybe_restore(exprasmlist,left.location,pushedregs);
         { determine operator }
         case nodetype of
           shln: op:=OP_SHL;
           shrn: op:=OP_SHR;
         end;

         if is_64bitint(left.resulttype.def) then
           begin
              { already hanled in 1st pass }
              internalerror(2002081501);
(*  Normally for 64-bit cpu's this here should be here,
    and only pass_1 need to be overriden, but dunno how to
    do that!
              location_reset(location,LOC_REGISTER,OS_64);

              { load left operator in a register }
              location_force_reg(exprasmlist,left.location,OS_64,false);
              location_copy(location,left.location);

              if (right.nodetype=ordconstn) then
                begin
                   cg64.a_op64_const_reg(exprasmlist,op,tordconstnode(right).value,
                     joinreg64(location.registerlow,location.registerhigh));
                end
              else
                begin
                  { this should be handled in pass_1 }
                  internalerror(2002081501);

                   if right.location.loc<>LOC_REGISTER then
                     begin
                       if right.location.loc<>LOC_CREGISTER then
                        location_release(exprasmlist,right.location);
                       hcountreg:=cg.get_scratch_reg_int(exprasmlist);
                       cg.a_load_loc_reg(exprasmlist,right.location,hcountreg);
                       freescratch := true;
                     end
                   else
                      hcountreg:=right.location.register;
                   cg64.a_op64_reg_reg(exprasmlist,op,hcountreg,
                     joinreg64(location.registerlow,location.registerhigh));
                   if freescratch then
                      cg.free_scratch_reg(exprasmlist,hcountreg);
                end;*)
           end
         else
           begin
              { load left operators in a register }
              location_copy(location,left.location);
              location_force_reg(exprasmlist,location,OS_INT,false);

              { shifting by a constant directly coded: }
              if (right.nodetype=ordconstn) then
                begin
                   { l shl 32 should 0 imho, but neither TP nor Delphi do it in this way (FK)
                   if right.value<=31 then
                   }
                   cg.a_op_const_reg(exprasmlist,op,tordconstnode(right).value and 31,
                     location.register);
                   {
                   else
                     emit_reg_reg(A_XOR,S_L,hregister1,
                       hregister1);
                   }
                end
              else
                begin
                   { load right operators in a register - this
                     is done since most target cpu which will use this
                     node do not support a shift count in a mem. location (cec)
                   }
                   if right.location.loc<>LOC_REGISTER then
                     begin
                       if right.location.loc<>LOC_CREGISTER then
                        location_release(exprasmlist,right.location);
                       hcountreg:=cg.get_scratch_reg_int(exprasmlist);
                       freescratch := true;
                       cg.a_load_loc_reg(exprasmlist,right.location,hcountreg);
                     end
                   else
                     hcountreg:=right.location.register;
                   cg.a_op_reg_reg(exprasmlist,op,OS_INT,hcountreg,location.register);
                   if freescratch then
                      cg.free_scratch_reg(exprasmlist,hcountreg);
                end;
           end;
      end;



begin
   cmoddivnode:=tcgmoddivnode;
   cunaryminusnode:=tcgunaryminusnode;
   cshlshrnode:=tcgshlshrnode;
end.
{
  $Log$
  Revision 1.4  2002-09-17 18:54:02  jonas
    * a_load_reg_reg() now has two size parameters: source and dest. This
      allows some optimizations on architectures that don't encode the
      register size in the register name.

  Revision 1.3  2002/08/23 16:14:48  peter
    * tempgen cleanup
    * tt_noreuse temp type added that will be used in genentrycode

  Revision 1.2  2002/08/15 15:15:55  carl
    * jmpbuf size allocation for exceptions is now cpu specific (as it should)
    * more generic nodes for maths
    * several fixes for better m68k support

  Revision 1.1  2002/08/14 19:26:55  carl
    + generic int_to_real type conversion
    + generic unaryminus node

}