freepascal.compiler/compiler/nmat.pas

{
    $Id$
    Copyright (c) 2000-2002 by Florian Klaempfl

    Type checking and register allocation for math 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 nmat;

{$i fpcdefs.inc}

interface

    uses
       node;

    type
       tmoddivnode = class(tbinopnode)
          function pass_1 : tnode;override;
          function det_resulttype:tnode;override;
         protected
          { override the following if you want to implement }
          { parts explicitely in the code generator (JM)    }
          function first_moddiv64bitint: tnode; virtual;
          function firstoptimize: tnode; virtual;
       end;
       tmoddivnodeclass = class of tmoddivnode;

       tshlshrnode = class(tbinopnode)
          function pass_1 : tnode;override;
          function det_resulttype:tnode;override;
       end;
       tshlshrnodeclass = class of tshlshrnode;

       tunaryminusnode = class(tunarynode)
          constructor create(expr : tnode);virtual;
          function pass_1 : tnode;override;
          function det_resulttype:tnode;override;
       end;
       tunaryminusnodeclass = class of tunaryminusnode;

       tnotnode = class(tunarynode)
          constructor create(expr : tnode);virtual;
          function pass_1 : tnode;override;
          function det_resulttype:tnode;override;
       {$ifdef state_tracking}
	  function track_state_pass(exec_known:boolean):boolean;override;
	{$endif}
       end;
       tnotnodeclass = class of tnotnode;

    var
       cmoddivnode : tmoddivnodeclass;
       cshlshrnode : tshlshrnodeclass;
       cunaryminusnode : tunaryminusnodeclass;
       cnotnode : tnotnodeclass;


implementation

    uses
      systems,tokens,
      verbose,globals,cutils,
      globtype,
      symconst,symtype,symtable,symdef,defbase,
      htypechk,pass_1,cpubase,
      cgbase,
      ncon,ncnv,ncal,nadd;

{****************************************************************************
                              TMODDIVNODE
 ****************************************************************************}

    function tmoddivnode.det_resulttype:tnode;
      var
         t : tnode;
         rd,ld : tdef;
         rv,lv : tconstexprint;
      begin
         result:=nil;
         resulttypepass(left);
         resulttypepass(right);
         set_varstate(left,true);
         set_varstate(right,true);
         if codegenerror then
           exit;

         { constant folding }
         if is_constintnode(left) and is_constintnode(right) then
           begin
              rv:=tordconstnode(right).value;
              lv:=tordconstnode(left).value;

              { check for division by zero }
              if (rv=0) then
               begin
                 Message(parser_e_division_by_zero);
                 { recover }
                 rv:=1;
               end;

              case nodetype of
                modn:
                  t:=genintconstnode(lv mod rv);
                divn:
                  t:=genintconstnode(lv div rv);
              end;
              result:=t;
              exit;
           end;

         { allow operator overloading }
         t:=self;
         if isbinaryoverloaded(t) then
           begin
              result:=t;
              exit;
           end;

         { if one operand is a cardinal and the other is a positive constant, convert the }
         { constant to a cardinal as well so we don't have to do a 64bit division (JM)    }

         { Do the same for qwords and positive constants as well, otherwise things like   }
         { "qword mod 10" are evaluated with int64 as result, which is wrong if the       }
         { "qword" was > high(int64) (JM)                                                 }
         if (left.resulttype.def.deftype=orddef) and (right.resulttype.def.deftype=orddef) then
           if (torddef(right.resulttype.def).typ in [u32bit,u64bit]) and
              is_constintnode(left) and
              (tordconstnode(left).value >= 0) then
             inserttypeconv(left,right.resulttype)
           else if (torddef(left.resulttype.def).typ in [u32bit,u64bit]) and
              is_constintnode(right) and
              (tordconstnode(right).value >= 0) then
             inserttypeconv(right,left.resulttype);

         if (left.resulttype.def.deftype=orddef) and (right.resulttype.def.deftype=orddef) and
            (is_64bitint(left.resulttype.def) or is_64bitint(right.resulttype.def) or
             { when mixing cardinals and signed numbers, convert everythign to 64bit (JM) }
             ((torddef(right.resulttype.def).typ = u32bit) and
              is_signed(left.resulttype.def)) or
             ((torddef(left.resulttype.def).typ = u32bit) and
              is_signed(right.resulttype.def))) then
           begin
              rd:=right.resulttype.def;
              ld:=left.resulttype.def;
              { issue warning if necessary }
              if not (is_64bitint(left.resulttype.def) or is_64bitint(right.resulttype.def)) then
                CGMessage(type_w_mixed_signed_unsigned);
              if is_signed(rd) or is_signed(ld) then
                begin
                   if (torddef(ld).typ<>s64bit) then
                     inserttypeconv(left,cs64bittype);
                   if (torddef(rd).typ<>s64bit) then
                     inserttypeconv(right,cs64bittype);
                end
              else
                begin
                   if (torddef(ld).typ<>u64bit) then
                     inserttypeconv(left,cu64bittype);
                   if (torddef(rd).typ<>u64bit) then
                     inserttypeconv(right,cu64bittype);
                end;
              resulttype:=left.resulttype;
           end
         else
           begin
              if not(right.resulttype.def.deftype=orddef) or
                 not(torddef(right.resulttype.def).typ in [s32bit,u32bit]) then
                inserttypeconv(right,s32bittype);

              if not(left.resulttype.def.deftype=orddef) or
                 not(torddef(left.resulttype.def).typ in [s32bit,u32bit]) then
                inserttypeconv(left,s32bittype);

              { the resulttype.def depends on the right side, because the left becomes }
              { always 64 bit                                                      }
              resulttype:=right.resulttype;
           end;
      end;


    function tmoddivnode.first_moddiv64bitint: tnode;
      var
        procname: string[31];
      begin
        result := nil;

        { otherwise create a call to a helper }
        if nodetype = divn then
          procname := 'fpc_div_'
        else
          procname := 'fpc_mod_';
        if is_signed(resulttype.def) then
          procname := procname + 'int64'
        else
          procname := procname + 'qword';

        result := ccallnode.createintern(procname,ccallparanode.create(left,
          ccallparanode.create(right,nil)));
        left := nil;
        right := nil;
        firstpass(result);
      end;


    function tmoddivnode.firstoptimize: tnode;
      var
        power{,shiftval} : longint;
        newtype: tnodetype;
      begin
        result := nil;
        { divide/mod a number by a constant which is a power of 2? }
        if (cs_optimize in aktglobalswitches) and
           (right.nodetype = ordconstn) and
{           ((nodetype = divn) or
            not is_signed(resulttype.def)) and}
           (not is_signed(resulttype.def)) and
           ispowerof2(tordconstnode(right).value,power) then
          begin
            if nodetype = divn then
              begin
(*
                if is_signed(resulttype.def) then
                  begin
                    if is_64bitint(left.resulttype.def) then
                      if not (cs_littlesize in aktglobalswitches) then
                        shiftval := 63
                      else
                        { the shift code is a lot bigger than the call to }
                        { the divide helper                               }
                        exit
                    else
                      shiftval := 31;
                    { we reuse left twice, so create once a copy of it     }
                    { !!! if left is a call is -> call gets executed twice }
                    left := caddnode.create(addn,left,
                      caddnode.create(andn,
                        cshlshrnode.create(sarn,left.getcopy,
                          cordconstnode.create(shiftval,s32bittype)),
                        cordconstnode.create(tordconstnode(right).value-1,
                          right.resulttype)));
                    newtype := sarn;
                  end
                else
*)
                  newtype := shrn;
                tordconstnode(right).value := power;
                result := cshlshrnode.create(newtype,left,right)
              end
            else
              begin
                dec(tordconstnode(right).value);
                result := caddnode.create(andn,left,right);
              end;
            { left and right are reused }
            left := nil;
            right := nil;
            firstpass(result);
            exit;
          end;
      end;


    function tmoddivnode.pass_1 : tnode;
      begin
         result:=nil;
         firstpass(left);
         firstpass(right);
         if codegenerror then
           exit;

         result := firstoptimize;
         if assigned(result) then
           exit;
         { 64bit }
         if (left.resulttype.def.deftype=orddef) and (right.resulttype.def.deftype=orddef) and
            (is_64bitint(left.resulttype.def) or is_64bitint(right.resulttype.def)) then
           begin
             result := first_moddiv64bitint;
             if assigned(result) then
               exit;
             location.loc:=LOC_REGISTER;
             calcregisters(self,2,0,0);
           end
         else
           begin
             left_right_max;
             if left.registers32<=right.registers32 then
              inc(registers32);
           end;
         location.loc:=LOC_REGISTER;
      end;



{****************************************************************************
                              TSHLSHRNODE
 ****************************************************************************}

    function tshlshrnode.det_resulttype:tnode;
      var
         t : tnode;
      begin
         result:=nil;
         resulttypepass(left);
         resulttypepass(right);
         set_varstate(right,true);
         set_varstate(left,true);
         if codegenerror then
           exit;

         { constant folding }
         if is_constintnode(left) and is_constintnode(right) then
           begin
              case nodetype of
                 shrn:
                   t:=genintconstnode(tordconstnode(left).value shr tordconstnode(right).value);
                 shln:
                   t:=genintconstnode(tordconstnode(left).value shl tordconstnode(right).value);
              end;
              result:=t;
              exit;
           end;

         { allow operator overloading }
         t:=self;
         if isbinaryoverloaded(t) then
           begin
              result:=t;
              exit;
           end;

         { 64 bit ints have their own shift handling }
         if not(is_64bitint(left.resulttype.def)) then
           begin
              if torddef(left.resulttype.def).typ <> u32bit then
               inserttypeconv(left,s32bittype);
           end;

         inserttypeconv(right,s32bittype);

         resulttype:=left.resulttype;
      end;


    function tshlshrnode.pass_1 : tnode;
      var
         regs : longint;
      begin
         result:=nil;
         firstpass(left);
         firstpass(right);
         if codegenerror then
           exit;

         { 64 bit ints have their own shift handling }
         if not(is_64bitint(left.resulttype.def)) then
          regs:=1
         else
          regs:=2;

         if (right.nodetype<>ordconstn) then
          inc(regs);
         location.loc:=LOC_REGISTER;
         calcregisters(self,regs,0,0);
      end;


{****************************************************************************
                            TUNARYMINUSNODE
 ****************************************************************************}

    constructor tunaryminusnode.create(expr : tnode);
      begin
         inherited create(unaryminusn,expr);
      end;

    function tunaryminusnode.det_resulttype : tnode;
      var
         t : tnode;
         minusdef : pprocdeflist;
      begin
         result:=nil;
         resulttypepass(left);
         set_varstate(left,true);
         if codegenerror then
           exit;

         { constant folding }
         if is_constintnode(left) then
           begin
              tordconstnode(left).value:=-tordconstnode(left).value;
              result:=left;
              left:=nil;
              exit;
           end;
         if is_constrealnode(left) then
           begin
              trealconstnode(left).value_real:=-trealconstnode(left).value_real;
              result:=left;
              left:=nil;
              exit;
           end;

         resulttype:=left.resulttype;
         if (left.resulttype.def.deftype=floatdef) then
           begin
           end
{$ifdef SUPPORT_MMX}
         else if (cs_mmx in aktlocalswitches) and
           is_mmx_able_array(left.resulttype.def) then
             begin
               { if saturation is on, left.resulttype.def isn't
                 "mmx able" (FK)
               if (cs_mmx_saturation in aktlocalswitches^) and
                 (torddef(tarraydef(resulttype.def).definition).typ in
                 [s32bit,u32bit]) then
                 CGMessage(type_e_mismatch);
               }
             end
{$endif SUPPORT_MMX}
         else if is_64bitint(left.resulttype.def) then
           begin
           end
         else if (left.resulttype.def.deftype=orddef) then
           begin
              inserttypeconv(left,s32bittype);
              resulttype:=left.resulttype;
           end
         else
           begin
              if assigned(overloaded_operators[_minus]) then
                minusdef:=overloaded_operators[_minus].defs
              else
                minusdef:=nil;
              while assigned(minusdef) do
                begin
                   if is_equal(tparaitem(minusdef^.def.para.first).paratype.def,left.resulttype.def) and
                      (tparaitem(minusdef^.def.para.first).next=nil) then
                     begin
                        t:=ccallnode.create(ccallparanode.create(left,nil),
                                            overloaded_operators[_minus],nil,nil);
                        left:=nil;
                        result:=t;
                        exit;
                     end;
                   minusdef:=minusdef^.next;
                end;
              CGMessage(type_e_mismatch);
           end;
      end;

    { generic code     }
    { overridden by:   }
    {   i386           }
    function tunaryminusnode.pass_1 : tnode;
      begin
         result:=nil;
         firstpass(left);
         if codegenerror then
           exit;

         registers32:=left.registers32;
         registersfpu:=left.registersfpu;
{$ifdef SUPPORT_MMX}
         registersmmx:=left.registersmmx;
{$endif SUPPORT_MMX}

         if (left.resulttype.def.deftype=floatdef) then
           begin
              if (left.location.loc<>LOC_REGISTER) and
                 (registersfpu<1) then
                registersfpu:=1;
              location.loc:=LOC_REGISTER;
           end
{$ifdef SUPPORT_MMX}
         else if (cs_mmx in aktlocalswitches) and
           is_mmx_able_array(left.resulttype.def) then
             begin
               if (left.location.loc<>LOC_MMXREGISTER) and
                  (registersmmx<1) then
                 registersmmx:=1;
             end
{$endif SUPPORT_MMX}
         else if is_64bitint(left.resulttype.def) then
           begin
              if (left.location.loc<>LOC_REGISTER) and
                 (registers32<2) then
                registers32:=2;
              location.loc:=LOC_REGISTER;
           end
         else if (left.resulttype.def.deftype=orddef) then
           begin
              if (left.location.loc<>LOC_REGISTER) and
                 (registers32<1) then
                registers32:=1;
              location.loc:=LOC_REGISTER;
           end;
      end;


{****************************************************************************
                               TNOTNODE
 ****************************************************************************}

    const boolean_reverse:array[ltn..unequaln] of Tnodetype=
	(gten,gtn,lten,ltn,unequaln,equaln);

    constructor tnotnode.create(expr : tnode);

      begin
         inherited create(notn,expr);
      end;

    function tnotnode.det_resulttype : tnode;
      var
         t : tnode;
         notdef : pprocdeflist;
         v : tconstexprint;
      begin
         result:=nil;
         resulttypepass(left);
         set_varstate(left,true);
         if codegenerror then
           exit;

         resulttype:=left.resulttype;

	 {Try optmimizing ourself away.}
	 if left.nodetype=notn then
	    begin
		{Double not. Remove both.}
		t:=Tnotnode(left).left;
		Tnotnode(left).left:=nil;
		left:=t;
		result:=t;
		exit;
	    end;
	 if left.nodetype in [ltn,lten,equaln,unequaln,gtn,gten] then
	    begin
		{Not of boolean expression. Turn around the operator and remove
		 the not.}
		result:=left;
		left.nodetype:=boolean_reverse[left.nodetype];
		left:=nil;
		exit;
	    end;

         { constant folding }
         if (left.nodetype=ordconstn) then
           begin
              v:=tordconstnode(left).value;
              case torddef(left.resulttype.def).typ of
                bool8bit,
                bool16bit,
                bool32bit :
                  begin
                    { here we do a boolean(byte(..)) type cast because }
                    { boolean(<int64>) is buggy in 1.00                }
                    v:=byte(not(boolean(byte(v))));
                  end;
                uchar,
                u8bit :
                  v:=byte(not byte(v));
                s8bit :
                  v:=shortint(not shortint(v));
                uwidechar,
                u16bit :
                  v:=word(not word(v));
                s16bit :
                  v:=smallint(not smallint(v));
                u32bit :
                  v:=cardinal(not cardinal(v));
                s32bit :
                  v:=longint(not longint(v));
                u64bit :
                  v:=int64(not int64(v)); { maybe qword is required }
                s64bit :
                  v:=int64(not int64(v));
                else
                  CGMessage(type_e_mismatch);
              end;
              t:=cordconstnode.create(v,left.resulttype);
              result:=t;
              exit;
           end;

         if is_boolean(resulttype.def) then
           begin
           end
         else
{$ifdef SUPPORT_MMX}
           if (cs_mmx in aktlocalswitches) and
             is_mmx_able_array(left.resulttype.def) then
             begin
             end
         else
{$endif SUPPORT_MMX}
           if is_64bitint(left.resulttype.def) then
             begin
             end
         else if is_integer(left.resulttype.def) then
           begin
           end
         else
           begin
              if assigned(overloaded_operators[_op_not]) then
                notdef:=overloaded_operators[_op_not].defs
              else
                notdef:=nil;
              while assigned(notdef) do
                begin
                   if is_equal(tparaitem(notdef^.def.para.first).paratype.def,left.resulttype.def) and
                      (tparaitem(notdef^.def.para.first).next=nil) then
                     begin
                        t:=ccallnode.create(ccallparanode.create(left,nil),
                                            overloaded_operators[_op_not],nil,nil);
                        left:=nil;
                        result:=t;
                        exit;
                     end;
                   notdef:=notdef^.next;
                end;
              CGMessage(type_e_mismatch);
           end;
      end;


    function tnotnode.pass_1 : tnode;
      begin
         result:=nil;
         firstpass(left);
         if codegenerror then
           exit;

         location.loc:=left.location.loc;
         registers32:=left.registers32;
{$ifdef SUPPORT_MMX}
         registersmmx:=left.registersmmx;
{$endif SUPPORT_MMX}
         if is_boolean(resulttype.def) then
           begin
             if (location.loc in [LOC_REFERENCE,LOC_CREFERENCE,LOC_CREGISTER]) then
              begin
                location.loc:=LOC_REGISTER;
                if (registers32<1) then
                 registers32:=1;
              end;
            { before loading it into flags we need to load it into
              a register thus 1 register is need PM }
{$ifdef i386}
             if left.location.loc<>LOC_JUMP then
               location.loc:=LOC_FLAGS;
{$endif def i386}
           end
         else
{$ifdef SUPPORT_MMX}
           if (cs_mmx in aktlocalswitches) and
             is_mmx_able_array(left.resulttype.def) then
             begin
               if (left.location.loc<>LOC_MMXREGISTER) and
                 (registersmmx<1) then
                 registersmmx:=1;
             end
         else
{$endif SUPPORT_MMX}
           if is_64bitint(left.resulttype.def) then
             begin
                if (location.loc in [LOC_REFERENCE,LOC_CREFERENCE,LOC_CREGISTER]) then
                 begin
                   location.loc:=LOC_REGISTER;
                   if (registers32<2) then
                    registers32:=2;
                 end;
             end
         else if is_integer(left.resulttype.def) then
           begin
              if (left.location.loc<>LOC_REGISTER) and
                 (registers32<1) then
                registers32:=1;
              location.loc:=LOC_REGISTER;
           end
      end;

{$ifdef state_tracking}
    function Tnotnode.track_state_pass(exec_known:boolean):boolean;

    begin
	track_state_pass:=true;
	if left.track_state_pass(exec_known) then
	    begin
		left.resulttype.def:=nil;
		do_resulttypepass(left);
	    end;
    end;
{$endif}

begin
   cmoddivnode:=tmoddivnode;
   cshlshrnode:=tshlshrnode;
   cunaryminusnode:=tunaryminusnode;
   cnotnode:=tnotnode;
end.
{
  $Log$
  Revision 1.36  2002-07-20 11:57:54  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 1.35  2002/07/19 11:41:36  daniel
  * State tracker work
  * The whilen and repeatn are now completely unified into whilerepeatn. This
    allows the state tracker to change while nodes automatically into
    repeat nodes.
  * Resulttypepass improvements to the notn. 'not not a' is optimized away and
    'not(a>b)' is optimized into 'a<=b'.
  * Resulttypepass improvements to the whilerepeatn. 'while not a' is optimized
    by removing the notn and later switchting the true and falselabels. The
    same is done with 'repeat until not a'.

  Revision 1.34  2002/05/18 13:34:10  peter
    * readded missing revisions

  Revision 1.33  2002/05/16 19:46:39  carl
  + defines.inc -> fpcdefs.inc to avoid conflicts if compiling by hand
  + try to fix temp allocation (still in ifdef)
  + generic constructor calls
  + start of tassembler / tmodulebase class cleanup

  Revision 1.31  2002/04/07 13:26:10  carl
  + change unit use

  Revision 1.30  2002/04/02 17:11:29  peter
    * tlocation,treference update
    * LOC_CONSTANT added for better constant handling
    * secondadd splitted in multiple routines
    * location_force_reg added for loading a location to a register
      of a specified size
    * secondassignment parses now first the right and then the left node
      (this is compatible with Kylix). This saves a lot of push/pop especially
      with string operations
    * adapted some routines to use the new cg methods

  Revision 1.29  2002/03/04 19:10:11  peter
    * removed compiler warnings

  Revision 1.28  2002/02/11 11:45:51  michael
  * Compilation without mmx support fixed from Peter

}