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path: root/src/vhdl/vhdl-sem_utils.adb

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background-color: #fff0f0 } /* Literal.String.Heredoc */ .highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */ .highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */ .highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */ .highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */ .highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */ .highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */ .highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */ .highlight .vc { color: #336699 } /* Name.Variable.Class */ .highlight .vg { color: #dd7700 } /* Name.Variable.Global */ .highlight .vi { color: #3333bb } /* Name.Variable.Instance */ .highlight .vm { color: #336699 } /* Name.Variable.Magic */ .highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */ source "tmp/.config-target.in" # Kernel/Hardware features config HAS_SPE_FPU depends on powerpc select HAS_FPU bool config HAS_FPU bool config AUDIO_SUPPORT bool config GPIO_SUPPORT bool config PCI_SUPPORT select AUDIO_SUPPORT bool config PCIE_SUPPORT bool config PCMCIA_SUPPORT bool config USB_SUPPORT select AUDIO_SUPPORT bool config USB_GADGET_SUPPORT bool config RTC_SUPPORT bool config BIG_ENDIAN bool config USES_DEVICETREE bool config USES_INITRAMFS bool config USES_SQUASHFS bool config USES_JFFS2 bool config USES_JFFS2_NAND bool config USES_EXT4 bool config USES_TARGZ bool config USES_CPIOGZ bool config USES_UBIFS bool select NAND_SUPPORT config PROFILE_KCONFIG bool config LOW_MEMORY_FOOTPRINT bool config NOMMU bool config HAS_MIPS16 depends on (mips || mipsel || mips64 || mips64el) bool config RFKILL_SUPPORT bool config NAND_SUPPORT bool config ARCH_64BIT bool # Architecture selection config aarch64 select ARCH_64BIT bool config aarch64_be select ARCH_64BIT select BIG_ENDIAN bool config arc bool config arceb select BIG_ENDIAN bool config arm bool config armeb select BIG_ENDIAN bool config arm_v4 bool config arm_v5 bool config arm_v6 bool config arm_v7 bool config i386 bool config i686 bool config m68k bool config mips select BIG_ENDIAN bool config mipsel bool config mips64 select BIG_ENDIAN select ARCH_64BIT bool config mips64el select ARCH_64BIT bool config powerpc select BIG_ENDIAN bool config powerpc64 select BIG_ENDIAN select ARCH_64BIT bool config sh3 bool config sh3eb select BIG_ENDIAN bool config sh4 bool config sh4eb select BIG_ENDIAN bool config sparc select BIG_ENDIAN bool config x86_64 select ARCH_64BIT bool config ARCH string default "aarch64" if aarch64 default "aarch64_be" if aarch64_be default "arc" if arc default "arceb" if arceb default "arm" if arm default "armeb" if armeb default "i386" if i386 default "i686" if i686 default "m68k" if m68k default "mips" if mips default "mipsel" if mipsel default "mips64" if mips64 default "mips64el" if mips64el default "powerpc" if powerpc default "sh3" if sh3 default "sh3eb" if sh3eb default "sh4" if sh4 default "sh4eb" if sh4eb default "sparc" if sparc default "x86_64" if x86_64

generated by cgit v1.2.3 (git 2.25.1) at 2025-04-05 22:57:54 +0000

--  Semantic utilities.
--  Copyright (C) 2018 Tristan Gingold
--
--  GHDL 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, or (at your option) any later
--  version.
--
--  GHDL 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 GHDL; see the file COPYING.  If not, write to the Free
--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
--  02111-1307, USA.
with Ada.Unchecked_Conversion;
with Types; use Types;
with Flags; use Flags;
with Vhdl.Errors; use Vhdl.Errors;
with Vhdl.Nodes_Utils; use Vhdl.Nodes_Utils;
with Vhdl.Utils; use Vhdl.Utils;
with Vhdl.Ieee.Std_Logic_1164;
with Std_Names;
with Vhdl.Std_Package; use Vhdl.Std_Package;

package body Vhdl.Sem_Utils is
   procedure Compute_Subprogram_Hash (Subprg : Iir)
   is
      type Hash_Type is mod 2**32;
      function To_Hash is new Ada.Unchecked_Conversion
        (Source => Iir, Target => Hash_Type);
      function To_Int32 is new Ada.Unchecked_Conversion
        (Source => Hash_Type, Target => Iir_Int32);

      Kind : Iir_Kind;
      Hash : Hash_Type;
      Sig : Hash_Type;
      Inter : Iir;
      Itype : Iir;
   begin
      Kind := Get_Kind (Subprg);
      if Kind = Iir_Kind_Function_Declaration
        or else Kind = Iir_Kind_Enumeration_Literal
      then
         Itype := Get_Base_Type (Get_Return_Type (Subprg));
         Hash := To_Hash (Itype);
         Sig := 8;
      else
         Sig := 1;
         Hash := 0;
      end if;

      if Kind /= Iir_Kind_Enumeration_Literal then
         Inter := Get_Interface_Declaration_Chain (Subprg);
         while Inter /= Null_Iir loop
            Itype := Get_Base_Type (Get_Type (Inter));
            Sig := Sig + 1;
            Hash := Hash * 7 + To_Hash (Itype);
            Hash := Hash + Hash / 2**28;
            Inter := Get_Chain (Inter);
         end loop;
      end if;
      Set_Subprogram_Hash (Subprg, To_Int32 (Hash + Sig));
   end Compute_Subprogram_Hash;

   --  LRM93 7.2.2
   --  A discrete array is a one-dimensional array whose elements are of a
   --  discrete type.
   function Is_Discrete_Array (Def : Iir) return Boolean
   is
   begin
      case Get_Kind (Def) is
         when Iir_Kind_Array_Type_Definition
           | Iir_Kind_Array_Subtype_Definition =>
            null;
         when others =>
            raise Internal_Error;
            -- return False;
      end case;
      if not Is_One_Dimensional_Array_Type (Def) then
         return False;
      end if;
      if Get_Kind (Get_Element_Subtype (Def))
        not in Iir_Kinds_Discrete_Type_Definition
      then
         return False;
      end if;
      return True;
   end Is_Discrete_Array;

   function Create_Anonymous_Interface (Atype : Iir)
     return Iir_Interface_Constant_Declaration
   is
      Inter : Iir_Interface_Constant_Declaration;
   begin
      Inter := Create_Iir (Iir_Kind_Interface_Constant_Declaration);
      Location_Copy (Inter, Atype);
      Set_Identifier (Inter, Null_Identifier);
      Set_Mode (Inter, Iir_In_Mode);
      Set_Type (Inter, Atype);
      return Inter;
   end Create_Anonymous_Interface;

   --  Create an implicit/predefined function for DECL.
   function Create_Implicit_Function (Name : Name_Id;
                                      Decl : Iir;
                                      Def : Iir_Predefined_Functions;
                                      Interface_Chain : Iir;
                                      Return_Type : Iir)
                                     return Iir
   is
      Operation : Iir_Function_Declaration;
   begin
      Operation := Create_Iir (Iir_Kind_Function_Declaration);
      Location_Copy (Operation, Decl);
      Set_Parent (Operation, Get_Parent (Decl));
      Set_Interface_Declaration_Chain (Operation, Interface_Chain);
      Set_Return_Type (Operation, Return_Type);
      Set_Implicit_Definition (Operation, Def);
      Set_Identifier (Operation, Name);
      Set_Visible_Flag (Operation, True);
      Compute_Subprogram_Hash (Operation);
      return Operation;
   end Create_Implicit_Function;

   procedure Create_Implicit_File_Primitives
     (Decl : Iir_Type_Declaration; Type_Definition : Iir_File_Type_Definition)
   is
      Type_Mark : constant Iir := Get_File_Type_Mark (Type_Definition);
      Type_Mark_Type : constant Iir := Get_Type (Type_Mark);
      Proc: Iir_Procedure_Declaration;
      Func: Iir_Function_Declaration;
      Inter: Iir;
      Loc : Location_Type;
      File_Interface_Kind : Iir_Kind;
      First_Interface, Last_Interface : Iir;
      Last : Iir;
   begin
      Last := Decl;
      Loc := Get_Location (Decl);

      if Flags.Vhdl_Std >= Vhdl_93c then
         for I in 1 .. 2 loop
            --  Create the implicit file_open (form 1) declaration.
            --  Create the implicit file_open (form 2) declaration.
            Proc := Create_Iir (Iir_Kind_Procedure_Declaration);
            Set_Location (Proc, Loc);
            Set_Parent (Proc, Get_Parent (Decl));
            Set_Identifier (Proc, Std_Names.Name_File_Open);
            Set_Visible_Flag (Proc, True);
            Set_Wait_State (Proc, False);
            Chain_Init (First_Interface, Last_Interface);
            case I is
               when 1 =>
                  Set_Implicit_Definition (Proc, Iir_Predefined_File_Open);
               when 2 =>
                  Set_Implicit_Definition (Proc,
                                           Iir_Predefined_File_Open_Status);
                  --  status : out file_open_status.
                  Inter :=
                    Create_Iir (Iir_Kind_Interface_Variable_Declaration);
                  Set_Location (Inter, Loc);
                  Set_Identifier (Inter, Std_Names.Name_Status);
                  Set_Type (Inter,
                            Std_Package.File_Open_Status_Type_Definition);
                  Set_Mode (Inter, Iir_Out_Mode);
                  Set_Visible_Flag (Inter, True);
                  Chain_Append (First_Interface, Last_Interface, Inter);
            end case;
            --  File F : FT
            Inter := Create_Iir (Iir_Kind_Interface_File_Declaration);
            Set_Location (Inter, Loc);
            Set_Identifier (Inter, Std_Names.Name_F);
            Set_Type (Inter, Type_Definition);
            Set_Mode (Inter, Iir_Inout_Mode);
            Set_Visible_Flag (Inter, True);
            Chain_Append (First_Interface, Last_Interface, Inter);
            --  External_Name : in STRING
            Inter := Create_Iir (Iir_Kind_Interface_Constant_Declaration);
            Set_Location (Inter, Loc);
            Set_Identifier (Inter, Std_Names.Name_External_Name);
            Set_Type (Inter, Std_Package.String_Type_Definition);
            Set_Mode (Inter, Iir_In_Mode);
            Set_Visible_Flag (Inter, True);
            Chain_Append (First_Interface, Last_Interface, Inter);
            --  Open_Kind : in File_Open_Kind := Read_Mode.
            Inter := Create_Iir (Iir_Kind_Interface_Constant_Declaration);
            Set_Location (Inter, Loc);
            Set_Identifier (Inter, Std_Names.Name_Open_Kind);
            Set_Type (Inter, Std_Package.File_Open_Kind_Type_Definition);
            Set_Mode (Inter, Iir_In_Mode);
            Set_Default_Value
              (Inter,
               Build_Simple_Name (Std_Package.File_Open_Kind_Read_Mode, Loc));
            Set_Visible_Flag (Inter, True);
            Chain_Append (First_Interface, Last_Interface, Inter);
            Set_Interface_Declaration_Chain (Proc, First_Interface);
            Compute_Subprogram_Hash (Proc);
            -- Add it to the list.
            Insert_Incr (Last, Proc);
         end loop;

         --  Create the implicit file_close declaration.
         Proc := Create_Iir (Iir_Kind_Procedure_Declaration);
         Set_Identifier (Proc, Std_Names.Name_File_Close);
         Set_Location (Proc, Loc);
         Set_Parent (Proc, Get_Parent (Decl));
         Set_Implicit_Definition (Proc, Iir_Predefined_File_Close);
         Set_Visible_Flag (Proc, True);
         Set_Wait_State (Proc, False);
         Inter := Create_Iir (Iir_Kind_Interface_File_Declaration);
         Set_Identifier (Inter, Std_Names.Name_F);
         Set_Location (Inter, Loc);
         Set_Type (Inter, Type_Definition);
         Set_Mode (Inter, Iir_Inout_Mode);
         Set_Visible_Flag (Inter, True);
         Set_Interface_Declaration_Chain (Proc, Inter);
         Compute_Subprogram_Hash (Proc);
         -- Add it to the list.
         Insert_Incr (Last, Proc);
      end if;

      if Flags.Vhdl_Std = Vhdl_87 then
         File_Interface_Kind := Iir_Kind_Interface_Variable_Declaration;
      else
         File_Interface_Kind := Iir_Kind_Interface_File_Declaration;
      end if;

      -- Create the implicit procedure read declaration.
      Proc := Create_Iir (Iir_Kind_Procedure_Declaration);
      Set_Identifier (Proc, Std_Names.Name_Read);
      Set_Location (Proc, Loc);
      Set_Parent (Proc, Get_Parent (Decl));
      Set_Visible_Flag (Proc, True);
      Set_Wait_State (Proc, False);
      Chain_Init (First_Interface, Last_Interface);
      Inter := Create_Iir (File_Interface_Kind);
      Set_Identifier (Inter, Std_Names.Name_F);
      Set_Location (Inter, Loc);
      Set_Type (Inter, Type_Definition);
      Set_Mode (Inter, Iir_In_Mode);
      Set_Visible_Flag (Inter, True);
      Chain_Append (First_Interface, Last_Interface, Inter);
      Inter := Create_Iir (Iir_Kind_Interface_Variable_Declaration);
      Set_Identifier (Inter, Std_Names.Name_Value);
      Set_Location (Inter, Loc);
      Set_Subtype_Indication (Inter, Build_Simple_Name (Decl, Loc));
      Set_Type (Inter, Type_Mark_Type);
      Set_Mode (Inter, Iir_Out_Mode);
      Set_Visible_Flag (Inter, True);
      Chain_Append (First_Interface, Last_Interface, Inter);
      if Get_Kind (Type_Mark_Type) in Iir_Kinds_Array_Type_Definition
        and then Get_Constraint_State (Type_Mark_Type) /= Fully_Constrained
      then
         Inter := Create_Iir (Iir_Kind_Interface_Variable_Declaration);
         Set_Identifier (Inter, Std_Names.Name_Length);
         Set_Location (Inter, Loc);
         Set_Type (Inter, Std_Package.Natural_Subtype_Definition);
         Set_Mode (Inter, Iir_Out_Mode);
         Set_Visible_Flag (Inter, True);
         Chain_Append (First_Interface, Last_Interface, Inter);
         Set_Implicit_Definition (Proc, Iir_Predefined_Read_Length);
      else
         Set_Implicit_Definition (Proc, Iir_Predefined_Read);
      end if;
      Set_Interface_Declaration_Chain (Proc, First_Interface);
      Compute_Subprogram_Hash (Proc);
      -- Add it to the list.
      Insert_Incr (Last, Proc);

      -- Create the implicit procedure write declaration.
      Proc := Create_Iir (Iir_Kind_Procedure_Declaration);
      Set_Identifier (Proc, Std_Names.Name_Write);
      Set_Location (Proc, Loc);
      Set_Parent (Proc, Get_Parent (Decl));
      Set_Visible_Flag (Proc, True);
      Set_Wait_State (Proc, False);
      Chain_Init (First_Interface, Last_Interface);
      Inter := Create_Iir (File_Interface_Kind);
      Set_Identifier (Inter, Std_Names.Name_F);
      Set_Location (Inter, Loc);
      Set_Type (Inter, Type_Definition);
      Set_Mode (Inter, Iir_Out_Mode);
      Set_Name_Staticness (Inter, Locally);
      Set_Expr_Staticness (Inter, None);
      Set_Visible_Flag (Inter, True);
      Chain_Append (First_Interface, Last_Interface, Inter);
      Inter := Create_Iir (Iir_Kind_Interface_Constant_Declaration);
      Set_Identifier (Inter, Std_Names.Name_Value);
      Set_Location (Inter, Loc);
      Set_Subtype_Indication (Inter, Build_Simple_Name (Decl, Loc));
      Set_Type (Inter, Type_Mark_Type);
      Set_Mode (Inter, Iir_In_Mode);
      Set_Visible_Flag (Inter, True);
      Chain_Append (First_Interface, Last_Interface, Inter);
      Set_Implicit_Definition (Proc, Iir_Predefined_Write);
      Set_Interface_Declaration_Chain (Proc, First_Interface);
      Compute_Subprogram_Hash (Proc);
      -- Add it to the list.
      Insert_Incr (Last, Proc);

      --  Create the implicit procedure flush declaration
      if Flags.Vhdl_Std >= Vhdl_08 then
         Proc := Create_Iir (Iir_Kind_Procedure_Declaration);
         Set_Identifier (Proc, Std_Names.Name_Flush);
         Set_Location (Proc, Loc);
         Set_Parent (Proc, Get_Parent (Decl));
         Set_Visible_Flag (Proc, True);
         Set_Wait_State (Proc, False);
         Inter := Create_Iir (File_Interface_Kind);
         Set_Identifier (Inter, Std_Names.Name_F);
         Set_Location (Inter, Loc);
         Set_Type (Inter, Type_Definition);
         Set_Name_Staticness (Inter, Locally);
         Set_Expr_Staticness (Inter, None);
         Set_Visible_Flag (Inter, True);
         Set_Implicit_Definition (Proc, Iir_Predefined_Flush);
         Set_Interface_Declaration_Chain (Proc, Inter);
         Compute_Subprogram_Hash (Proc);
         -- Add it to the list.
         Insert_Incr (Last, Proc);
      end if;

      -- Create the implicit function endfile declaration.
      Func := Create_Iir (Iir_Kind_Function_Declaration);
      Set_Identifier (Func, Std_Names.Name_Endfile);
      Set_Location (Func, Loc);
      Set_Parent (Func, Get_Parent (Decl));
      Set_Visible_Flag (Func, True);
      Inter := Create_Iir (File_Interface_Kind);
      Set_Identifier (Inter, Std_Names.Name_F);
      Set_Location (Inter, Loc);
      Set_Type (Inter, Type_Definition);
      Set_Mode (Inter, Iir_In_Mode);
      Set_Visible_Flag (Inter, True);
      Set_Return_Type (Func, Std_Package.Boolean_Type_Definition);
      Set_Implicit_Definition (Func, Iir_Predefined_Endfile);
      Set_Interface_Declaration_Chain (Func, Inter);
      Compute_Subprogram_Hash (Func);
      -- Add it to the list.
      Insert_Incr (Last, Func);

   end Create_Implicit_File_Primitives;

   procedure Create_Implicit_Operations
     (Decl : Iir; Is_Std_Standard : Boolean := False)
   is
      use Std_Names;
      Binary_Chain : Iir;
      Unary_Chain : Iir;
      Type_Definition : Iir;
      Last : Iir;

      procedure Add_Operation (Name : Name_Id;
                               Def : Iir_Predefined_Functions;
                               Interface_Chain : Iir;
                               Return_Type : Iir)
      is
         Operation : Iir_Function_Declaration;
      begin
         Operation := Create_Implicit_Function
           (Name, Decl, Def, Interface_Chain, Return_Type);
         Insert_Incr (Last, Operation);
      end Add_Operation;

      procedure Add_Relational (Name : Name_Id; Def : Iir_Predefined_Functions)
      is
      begin
         Add_Operation
           (Name, Def, Binary_Chain, Std_Package.Boolean_Type_Definition);
      end Add_Relational;

      procedure Add_Binary (Name : Name_Id; Def : Iir_Predefined_Functions) is
      begin
         Add_Operation (Name, Def, Binary_Chain, Type_Definition);
      end Add_Binary;

      procedure Add_Unary (Name : Name_Id; Def : Iir_Predefined_Functions) is
      begin
         Add_Operation (Name, Def, Unary_Chain, Type_Definition);
      end Add_Unary;

      procedure Add_To_String (Def : Iir_Predefined_Functions) is
      begin
         Add_Operation (Name_To_String, Def,
                        Unary_Chain, String_Type_Definition);
      end Add_To_String;

      procedure Add_Min_Max (Name : Name_Id; Def : Iir_Predefined_Functions)
      is
         Left, Right : Iir;
      begin
         Left := Create_Anonymous_Interface (Type_Definition);
         Set_Identifier (Left, Name_L);
         Right := Create_Anonymous_Interface (Type_Definition);
         Set_Identifier (Right, Name_R);
         Set_Chain (Left, Right);
         Add_Operation (Name, Def, Left, Type_Definition);
      end Add_Min_Max;

      procedure Add_Vector_Min_Max
        (Name : Name_Id; Def : Iir_Predefined_Functions)
      is
         Left : Iir;
      begin
         Left := Create_Anonymous_Interface (Type_Definition);
         Set_Identifier (Left, Name_L);
         Add_Operation
           (Name, Def, Left, Get_Element_Subtype (Type_Definition));
      end Add_Vector_Min_Max;

      procedure Add_Shift_Operators
      is
         Inter_Chain : Iir_Interface_Constant_Declaration;
         Inter_Int : Iir;
      begin
         Inter_Chain := Create_Anonymous_Interface (Type_Definition);

         Inter_Int := Create_Iir (Iir_Kind_Interface_Constant_Declaration);
         Location_Copy (Inter_Int, Decl);
         Set_Identifier (Inter_Int, Null_Identifier);
         Set_Mode (Inter_Int, Iir_In_Mode);
         Set_Type (Inter_Int, Std_Package.Integer_Subtype_Definition);

         Set_Chain (Inter_Chain, Inter_Int);

         Add_Operation
           (Name_Sll, Iir_Predefined_Array_Sll, Inter_Chain, Type_Definition);
         Add_Operation
           (Name_Srl, Iir_Predefined_Array_Srl, Inter_Chain, Type_Definition);
         Add_Operation
           (Name_Sla, Iir_Predefined_Array_Sla, Inter_Chain, Type_Definition);
         Add_Operation
           (Name_Sra, Iir_Predefined_Array_Sra, Inter_Chain, Type_Definition);
         Add_Operation
           (Name_Rol, Iir_Predefined_Array_Rol, Inter_Chain, Type_Definition);
         Add_Operation
           (Name_Ror, Iir_Predefined_Array_Ror, Inter_Chain, Type_Definition);
      end Add_Shift_Operators;
   begin
      Last := Decl;

      Type_Definition := Get_Base_Type (Get_Type_Definition (Decl));
      if Get_Kind (Type_Definition) /= Iir_Kind_File_Type_Definition then
         Unary_Chain := Create_Anonymous_Interface (Type_Definition);
         Binary_Chain := Create_Anonymous_Interface (Type_Definition);
         Set_Chain (Binary_Chain, Unary_Chain);
      end if;

      case Get_Kind (Type_Definition) is
         when Iir_Kind_Enumeration_Type_Definition =>
            Add_Relational (Name_Op_Equality, Iir_Predefined_Enum_Equality);
            Add_Relational
              (Name_Op_Inequality, Iir_Predefined_Enum_Inequality);
            Add_Relational (Name_Op_Greater, Iir_Predefined_Enum_Greater);
            Add_Relational
              (Name_Op_Greater_Equal, Iir_Predefined_Enum_Greater_Equal);
            Add_Relational (Name_Op_Less, Iir_Predefined_Enum_Less);
            Add_Relational
              (Name_Op_Less_Equal, Iir_Predefined_Enum_Less_Equal);

            if Flags.Vhdl_Std >= Vhdl_08 then
               --  LRM08 5.2.6 Predefined operations on scalar types
               --  Given a type declaration that declares a scalar type T, the
               --  following operations are implicitely declared immediately
               --  following the type declaration (except for the TO_STRING
               --  operations in package STANDARD [...])
               Add_Min_Max (Name_Minimum, Iir_Predefined_Enum_Minimum);
               Add_Min_Max (Name_Maximum, Iir_Predefined_Enum_Maximum);
               if not Is_Std_Standard then
                  Add_To_String (Iir_Predefined_Enum_To_String);
               end if;

               --  LRM08 9.2.3 Relational operators
               --  The matching relational operators are predefined for the
               --  [predefined type BIT and for the] type STD_ULOGIC defined
               --  in package STD_LOGIC_1164.
               if Type_Definition = Ieee.Std_Logic_1164.Std_Ulogic_Type then
                  Add_Binary (Name_Op_Match_Equality,
                              Iir_Predefined_Std_Ulogic_Match_Equality);
                  Add_Binary (Name_Op_Match_Inequality,
                              Iir_Predefined_Std_Ulogic_Match_Inequality);
                  Add_Binary (Name_Op_Match_Less,
                              Iir_Predefined_Std_Ulogic_Match_Less);
                  Add_Binary (Name_Op_Match_Less_Equal,
                              Iir_Predefined_Std_Ulogic_Match_Less_Equal);
                  Add_Binary (Name_Op_Match_Greater,
                              Iir_Predefined_Std_Ulogic_Match_Greater);
                  Add_Binary (Name_Op_Match_Greater_Equal,
                              Iir_Predefined_Std_Ulogic_Match_Greater_Equal);
               end if;
            end if;

         when Iir_Kind_Array_Type_Definition
           | Iir_Kind_Array_Subtype_Definition =>
            declare
               Element_Type : Iir;

               Element_Array_Inter_Chain : Iir;
               Array_Element_Inter_Chain : Iir;
               Element_Element_Inter_Chain : Iir;
            begin
               Add_Relational
                 (Name_Op_Equality, Iir_Predefined_Array_Equality);
               Add_Relational
                 (Name_Op_Inequality, Iir_Predefined_Array_Inequality);
               if Is_Discrete_Array (Type_Definition) then
                  Add_Relational
                    (Name_Op_Greater, Iir_Predefined_Array_Greater);
                  Add_Relational
                    (Name_Op_Greater_Equal,
                     Iir_Predefined_Array_Greater_Equal);
                  Add_Relational
                    (Name_Op_Less, Iir_Predefined_Array_Less);
                  Add_Relational
                    (Name_Op_Less_Equal, Iir_Predefined_Array_Less_Equal);

                  --  LRM08 5.3.2.4 Predefined operations on array types
                  --  Given a type declaration that declares a discrete array
                  --  type T, the following operatons are implicitly declared
                  --  immediately following the type declaration:
                  --   function MINIMUM (L, R : T) return T;
                  --   function MAXIMUM (L, R : T) return T;
                  if Vhdl_Std >= Vhdl_08 then
                     Add_Min_Max (Name_Maximum, Iir_Predefined_Array_Maximum);
                     Add_Min_Max (Name_Minimum, Iir_Predefined_Array_Minimum);
                  end if;
               end if;

               Element_Type := Get_Element_Subtype (Type_Definition);

               if Is_One_Dimensional_Array_Type (Type_Definition) then
                  --  LRM93 7.2.4 Adding operators
                  --  The concatenation operator & is predefined for any
                  --  one-dimensional array type.
                  Add_Operation (Name_Op_Concatenation,
                                 Iir_Predefined_Array_Array_Concat,
                                 Binary_Chain,
                                 Type_Definition);

                  Element_Array_Inter_Chain :=
                    Create_Anonymous_Interface (Element_Type);
                  Set_Chain (Element_Array_Inter_Chain, Unary_Chain);
                  Add_Operation (Name_Op_Concatenation,
                                 Iir_Predefined_Element_Array_Concat,
                                 Element_Array_Inter_Chain,
                                 Type_Definition);

                  Array_Element_Inter_Chain :=
                    Create_Anonymous_Interface (Type_Definition);
                  Set_Chain (Array_Element_Inter_Chain,
                             Create_Anonymous_Interface (Element_Type));
                  Add_Operation (Name_Op_Concatenation,
                                 Iir_Predefined_Array_Element_Concat,
                                 Array_Element_Inter_Chain,
                                 Type_Definition);

                  Element_Element_Inter_Chain :=
                    Create_Anonymous_Interface (Element_Type);
                  Set_Chain (Element_Element_Inter_Chain,
                             Create_Anonymous_Interface (Element_Type));
                  Add_Operation (Name_Op_Concatenation,
                                 Iir_Predefined_Element_Element_Concat,
                                 Element_Element_Inter_Chain,
                                 Type_Definition);

                  --  LRM08 5.3.2.4 Predefined operations on array types
                  --  In addition, given a type declaration that declares a
                  --  one-dimensional array type T whose elements are of a
                  --  sclar type E, the following operations are implicitly
                  --  declared immediately following the type declaration:
                  --   function MINIMUM (L : T) return E;
                  --   function MAXIMUM (L : T) return E;
                  if Vhdl_Std >= Vhdl_08
                    and then (Get_Kind (Element_Type) in
                                Iir_Kinds_Scalar_Type_And_Subtype_Definition)
                  then
                     Add_Vector_Min_Max
                       (Name_Maximum, Iir_Predefined_Vector_Maximum);
                     Add_Vector_Min_Max
                       (Name_Minimum, Iir_Predefined_Vector_Minimum);
                  end if;

                  if Element_Type = Std_Package.Boolean_Type_Definition
                    or else Element_Type = Std_Package.Bit_Type_Definition
                  then
                     --  LRM93 7.2.1 Logical operators
                     --  LRM08 9.2.2 Logical operators
                     --  The binary logical operators AND, OR, NAND, NOR, XOR,
                     --  and XNOR, and the unary logical operator NOT are
                     --  defined for predefined types BIT and BOOLEAN.  They
                     --  are also defined for any one-dimensional array type
                     --  whose element type is BIT or BOOLEAN.

                     Add_Unary (Name_Not, Iir_Predefined_TF_Array_Not);

                     Add_Binary (Name_And, Iir_Predefined_TF_Array_And);
                     Add_Binary (Name_Or, Iir_Predefined_TF_Array_Or);
                     Add_Binary (Name_Nand, Iir_Predefined_TF_Array_Nand);
                     Add_Binary (Name_Nor, Iir_Predefined_TF_Array_Nor);
                     Add_Binary (Name_Xor, Iir_Predefined_TF_Array_Xor);
                     if Flags.Vhdl_Std > Vhdl_87 then
                        Add_Binary (Name_Xnor, Iir_Predefined_TF_Array_Xnor);

                        --  LRM93 7.2.3 Shift operators
                        --  The shift operators SLL, SRL, SLA, SRA, ROL and
                        --  ROR are defined for any one-dimensional array type
                        --  whose element type is either of the predefined
                        --  types BIT or BOOLEAN.
                        Add_Shift_Operators;
                     end if;

                     --  LRM08 9.2.2 Logical operators
                     --  For the binary operators AND, OR, NAND, NOR, XOR and
                     --  XNOR, the operands shall both be [of the same base
                     --  type,] or one operand shall be of a scalar type and
                     --  the other operand shall be a one-dimensional array
                     --  whose element type is the scalar type.  The result
                     --  type is the same as the base type of the operands if
                     --  [both operands are scalars of the same base type or]
                     --  both operands are arrays, or the same as the base type
                     --  of the array operand if one operand is a scalar and
                     --  the other operand is an array.
                     if Flags.Vhdl_Std >= Vhdl_08 then
                        Add_Operation
                          (Name_And, Iir_Predefined_TF_Element_Array_And,
                           Element_Array_Inter_Chain, Type_Definition);
                        Add_Operation
                          (Name_And, Iir_Predefined_TF_Array_Element_And,
                           Array_Element_Inter_Chain, Type_Definition);
                        Add_Operation
                          (Name_Or, Iir_Predefined_TF_Element_Array_Or,
                           Element_Array_Inter_Chain, Type_Definition);
                        Add_Operation
                          (Name_Or, Iir_Predefined_TF_Array_Element_Or,
                           Array_Element_Inter_Chain, Type_Definition);
                        Add_Operation
                          (Name_Nand, Iir_Predefined_TF_Element_Array_Nand,
                           Element_Array_Inter_Chain, Type_Definition);
                        Add_Operation
                          (Name_Nand, Iir_Predefined_TF_Array_Element_Nand,
                           Array_Element_Inter_Chain, Type_Definition);
                        Add_Operation
                          (Name_Nor, Iir_Predefined_TF_Element_Array_Nor,
                           Element_Array_Inter_Chain, Type_Definition);
                        Add_Operation
                          (Name_Nor, Iir_Predefined_TF_Array_Element_Nor,
                           Array_Element_Inter_Chain, Type_Definition);
                        Add_Operation
                          (Name_Xor, Iir_Predefined_TF_Element_Array_Xor,
                           Element_Array_Inter_Chain, Type_Definition);
                        Add_Operation
                          (Name_Xor, Iir_Predefined_TF_Array_Element_Xor,
                           Array_Element_Inter_Chain, Type_Definition);
                        Add_Operation
                          (Name_Xnor, Iir_Predefined_TF_Element_Array_Xnor,
                           Element_Array_Inter_Chain, Type_Definition);
                        Add_Operation
                          (Name_Xnor, Iir_Predefined_TF_Array_Element_Xnor,
                           Array_Element_Inter_Chain, Type_Definition);
                     end if;

                     if Flags.Vhdl_Std >= Vhdl_08 then
                        --  LRM08 9.2.2 Logical operations
                        --  The unary logical operators AND, OR, NAND, NOR,
                        --  XOR, and XNOR are referred to as logical reduction
                        --  operators.  The logical reduction operators are
                        --  predefined for any one-dimensional array type whose
                        --  element type is BIT or BOOLEAN.  The result type
                        --  for the logical reduction operators is the same as
                        --  the element type of the operand.
                        Add_Operation
                          (Name_And, Iir_Predefined_TF_Reduction_And,
                           Unary_Chain, Element_Type);
                        Add_Operation
                          (Name_Or, Iir_Predefined_TF_Reduction_Or,
                           Unary_Chain, Element_Type);
                        Add_Operation
                          (Name_Nand, Iir_Predefined_TF_Reduction_Nand,
                           Unary_Chain, Element_Type);
                        Add_Operation
                          (Name_Nor, Iir_Predefined_TF_Reduction_Nor,
                           Unary_Chain, Element_Type);
                        Add_Operation
                          (Name_Xor, Iir_Predefined_TF_Reduction_Xor,
                           Unary_Chain, Element_Type);
                        Add_Operation
                          (Name_Xnor, Iir_Predefined_TF_Reduction_Xnor,
                           Unary_Chain, Element_Type);
                     end if;
                  end if;

                  --  LRM08 9.2.3 Relational operators
                  --  The matching equality and matching inequality operatotrs
                  --  are also defined for any one-dimensional array type
                  --  whose element type is BIT or STD_ULOGIC.
                  if Flags.Vhdl_Std >= Vhdl_08 then
                     if Element_Type = Std_Package.Bit_Type_Definition then
                        Add_Operation
                          (Name_Op_Match_Equality,
                           Iir_Predefined_Bit_Array_Match_Equality,
                           Binary_Chain, Element_Type);
                        Add_Operation
                          (Name_Op_Match_Inequality,
                           Iir_Predefined_Bit_Array_Match_Inequality,
                           Binary_Chain, Element_Type);
                     elsif Element_Type = Ieee.Std_Logic_1164.Std_Ulogic_Type
                     then
                        Add_Operation
                          (Name_Op_Match_Equality,
                           Iir_Predefined_Std_Ulogic_Array_Match_Equality,
                           Binary_Chain, Element_Type);
                        Add_Operation
                          (Name_Op_Match_Inequality,
                           Iir_Predefined_Std_Ulogic_Array_Match_Inequality,
                           Binary_Chain, Element_Type);
                     end if;
                  end if;

                  --  LRM08 5.3.2.4  Predefined operations on array type
                  --
                  --  Given a type declaration that declares a one-dimensional
                  --  array type T whose element type is a character type that
                  --  contains only character literals, the following operation
                  --  is implicitely declared immediately following the type
                  --  declaration
                  if Vhdl_Std >= Vhdl_08
                    and then String_Type_Definition /= Null_Iir
                    and then (Get_Kind (Element_Type)
                                = Iir_Kind_Enumeration_Type_Definition)
                    and then Get_Only_Characters_Flag (Element_Type)
                  then
                     Add_Operation (Name_To_String,
                                    Iir_Predefined_Array_Char_To_String,
                                    Unary_Chain,
                                    String_Type_Definition);
                  end if;
               end if;
            end;

         when Iir_Kind_Access_Type_Definition =>
            Add_Relational (Name_Op_Equality, Iir_Predefined_Access_Equality);
            Add_Relational
              (Name_Op_Inequality, Iir_Predefined_Access_Inequality);
            declare
               Deallocate_Proc: Iir_Procedure_Declaration;
               Var_Interface: Iir_Interface_Variable_Declaration;
            begin
               Deallocate_Proc :=
                 Create_Iir (Iir_Kind_Procedure_Declaration);
               Location_Copy (Deallocate_Proc, Decl);
               Set_Identifier (Deallocate_Proc, Std_Names.Name_Deallocate);
               Set_Implicit_Definition
                 (Deallocate_Proc, Iir_Predefined_Deallocate);
               Set_Parent (Deallocate_Proc, Get_Parent (Decl));

               Var_Interface :=
                 Create_Iir (Iir_Kind_Interface_Variable_Declaration);
               Location_Copy (Var_Interface, Decl);
               Set_Identifier (Var_Interface, Std_Names.Name_P);
               Set_Parent (Var_Interface, Deallocate_Proc);
               Set_Type (Var_Interface, Type_Definition);
               Set_Mode (Var_Interface, Iir_Inout_Mode);
               --Set_Purity_State (Deallocate_Proc, Impure);
               Set_Wait_State (Deallocate_Proc, False);
               Set_Visible_Flag (Deallocate_Proc, True);

               Set_Interface_Declaration_Chain
                 (Deallocate_Proc, Var_Interface);
               Compute_Subprogram_Hash (Deallocate_Proc);
               Insert_Incr (Last, Deallocate_Proc);
            end;

         when Iir_Kind_Record_Type_Definition =>
            Add_Relational (Name_Op_Equality, Iir_Predefined_Record_Equality);
            Add_Relational
              (Name_Op_Inequality, Iir_Predefined_Record_Inequality);

         when Iir_Kind_Integer_Type_Definition =>
            Add_Relational (Name_Op_Equality, Iir_Predefined_Integer_Equality);
            Add_Relational
              (Name_Op_Inequality, Iir_Predefined_Integer_Inequality);
            Add_Relational (Name_Op_Greater, Iir_Predefined_Integer_Greater);
            Add_Relational
              (Name_Op_Greater_Equal, Iir_Predefined_Integer_Greater_Equal);
            Add_Relational (Name_Op_Less, Iir_Predefined_Integer_Less);
            Add_Relational
              (Name_Op_Less_Equal, Iir_Predefined_Integer_Less_Equal);

            Add_Binary (Name_Op_Plus, Iir_Predefined_Integer_Plus);
            Add_Binary (Name_Op_Minus, Iir_Predefined_Integer_Minus);

            Add_Unary (Name_Op_Minus, Iir_Predefined_Integer_Negation);
            Add_Unary (Name_Op_Plus, Iir_Predefined_Integer_Identity);

            Add_Binary (Name_Op_Mul, Iir_Predefined_Integer_Mul);
            Add_Binary (Name_Op_Div, Iir_Predefined_Integer_Div);
            Add_Binary (Name_Mod, Iir_Predefined_Integer_Mod);
            Add_Binary (Name_Rem, Iir_Predefined_Integer_Rem);

            Add_Unary (Name_Abs, Iir_Predefined_Integer_Absolute);

            declare
               Inter_Chain : Iir;
            begin
               Inter_Chain := Create_Anonymous_Interface (Type_Definition);
               Set_Chain
                 (Inter_Chain,
                  Create_Anonymous_Interface (Integer_Type_Definition));
               Add_Operation (Name_Op_Exp, Iir_Predefined_Integer_Exp,
                              Inter_Chain, Type_Definition);
            end;

            if Vhdl_Std >= Vhdl_08 then
               --  LRM08 5.2.6 Predefined operations on scalar types
               --  Given a type declaration that declares a scalar type T, the
               --  following operations are implicitely declared immediately
               --  following the type declaration (except for the TO_STRING
               --  operations in package STANDARD [...])
               Add_Min_Max (Name_Minimum, Iir_Predefined_Integer_Minimum);
               Add_Min_Max (Name_Maximum, Iir_Predefined_Integer_Maximum);
               if not Is_Std_Standard then
                  Add_To_String (Iir_Predefined_Integer_To_String);
               end if;
            end if;

         when Iir_Kind_Floating_Type_Definition =>
            Add_Relational
              (Name_Op_Equality, Iir_Predefined_Floating_Equality);
            Add_Relational
              (Name_Op_Inequality, Iir_Predefined_Floating_Inequality);
            Add_Relational
              (Name_Op_Greater, Iir_Predefined_Floating_Greater);
            Add_Relational
              (Name_Op_Greater_Equal, Iir_Predefined_Floating_Greater_Equal);
            Add_Relational
              (Name_Op_Less, Iir_Predefined_Floating_Less);
            Add_Relational
              (Name_Op_Less_Equal, Iir_Predefined_Floating_Less_Equal);

            Add_Binary (Name_Op_Plus, Iir_Predefined_Floating_Plus);
            Add_Binary (Name_Op_Minus, Iir_Predefined_Floating_Minus);

            Add_Unary (Name_Op_Minus, Iir_Predefined_Floating_Negation);
            Add_Unary (Name_Op_Plus, Iir_Predefined_Floating_Identity);

            Add_Binary (Name_Op_Mul, Iir_Predefined_Floating_Mul);
            Add_Binary (Name_Op_Div, Iir_Predefined_Floating_Div);

            Add_Unary (Name_Abs, Iir_Predefined_Floating_Absolute);

            declare
               Inter_Chain : Iir;
            begin
               Inter_Chain := Create_Anonymous_Interface (Type_Definition);
               Set_Chain
                 (Inter_Chain,
                  Create_Anonymous_Interface (Integer_Type_Definition));
               Add_Operation (Name_Op_Exp, Iir_Predefined_Floating_Exp,
                              Inter_Chain, Type_Definition);
            end;

            if Vhdl_Std >= Vhdl_08 then
               --  LRM08 5.2.6 Predefined operations on scalar types
               --  Given a type declaration that declares a scalar type T, the
               --  following operations are implicitely declared immediately
               --  following the type declaration (except for the TO_STRING
               --  operations in package STANDARD [...])
               Add_Min_Max (Name_Minimum, Iir_Predefined_Floating_Minimum);
               Add_Min_Max (Name_Maximum, Iir_Predefined_Floating_Maximum);
               if not Is_Std_Standard then
                  Add_To_String (Iir_Predefined_Floating_To_String);
               end if;
            end if;

         when Iir_Kind_Physical_Type_Definition =>
            Add_Relational
              (Name_Op_Equality, Iir_Predefined_Physical_Equality);
            Add_Relational
              (Name_Op_Inequality, Iir_Predefined_Physical_Inequality);
            Add_Relational
              (Name_Op_Greater, Iir_Predefined_Physical_Greater);
            Add_Relational
              (Name_Op_Greater_Equal, Iir_Predefined_Physical_Greater_Equal);
            Add_Relational
              (Name_Op_Less, Iir_Predefined_Physical_Less);
            Add_Relational
              (Name_Op_Less_Equal, Iir_Predefined_Physical_Less_Equal);

            Add_Binary (Name_Op_Plus, Iir_Predefined_Physical_Plus);
            Add_Binary (Name_Op_Minus, Iir_Predefined_Physical_Minus);

            Add_Unary (Name_Op_Minus, Iir_Predefined_Physical_Negation);
            Add_Unary (Name_Op_Plus, Iir_Predefined_Physical_Identity);

            declare
               Inter_Chain : Iir;
            begin
               Inter_Chain := Create_Anonymous_Interface (Type_Definition);
               Set_Chain
                 (Inter_Chain,
                  Create_Anonymous_Interface (Integer_Type_Definition));
               Add_Operation (Name_Op_Mul, Iir_Predefined_Physical_Integer_Mul,
                              Inter_Chain, Type_Definition);
               Add_Operation (Name_Op_Div, Iir_Predefined_Physical_Integer_Div,
                              Inter_Chain, Type_Definition);
            end;

            declare
               Inter_Chain : Iir;
            begin
               Inter_Chain :=
                 Create_Anonymous_Interface (Integer_Type_Definition);
               Set_Chain (Inter_Chain, Unary_Chain);
               Add_Operation (Name_Op_Mul, Iir_Predefined_Integer_Physical_Mul,
                              Inter_Chain, Type_Definition);
            end;

            declare
               Inter_Chain : Iir;
            begin
               Inter_Chain := Create_Anonymous_Interface (Type_Definition);
               Set_Chain (Inter_Chain,
                          Create_Anonymous_Interface (Real_Type_Definition));
               Add_Operation (Name_Op_Mul, Iir_Predefined_Physical_Real_Mul,
                              Inter_Chain, Type_Definition);
               Add_Operation (Name_Op_Div, Iir_Predefined_Physical_Real_Div,
                              Inter_Chain, Type_Definition);
            end;

            declare
               Inter_Chain : Iir;
            begin
               Inter_Chain :=
                 Create_Anonymous_Interface (Real_Type_Definition);
               Set_Chain (Inter_Chain, Unary_Chain);
               Add_Operation (Name_Op_Mul, Iir_Predefined_Real_Physical_Mul,
                              Inter_Chain, Type_Definition);
            end;
            Add_Operation (Name_Op_Div, Iir_Predefined_Physical_Physical_Div,
                           Binary_Chain,
                           Std_Package.Convertible_Integer_Type_Definition);

            Add_Unary (Name_Abs, Iir_Predefined_Physical_Absolute);

            if Vhdl_Std >= Vhdl_08 then
               --  LRM08 5.2.6 Predefined operations on scalar types
               --  Given a type declaration that declares a scalar type T, the
               --  following operations are implicitely declared immediately
               --  following the type declaration (except for the TO_STRING
               --  operations in package STANDARD [...])
               Add_Min_Max (Name_Minimum, Iir_Predefined_Physical_Minimum);
               Add_Min_Max (Name_Maximum, Iir_Predefined_Physical_Maximum);
               if not Is_Std_Standard then
                  Add_To_String (Iir_Predefined_Physical_To_String);
               end if;
            end if;

         when Iir_Kind_File_Type_Definition =>
            Create_Implicit_File_Primitives (Decl, Type_Definition);

         when Iir_Kind_Protected_Type_Declaration =>
            null;

         when others =>
            Error_Kind ("create_predefined_operations", Type_Definition);
      end case;

      if not Is_Std_Standard then
         return;
      end if;
      if Decl = Std_Package.Boolean_Type_Declaration then
         Add_Binary (Name_And, Iir_Predefined_Boolean_And);
         Add_Binary (Name_Or, Iir_Predefined_Boolean_Or);
         Add_Binary (Name_Nand, Iir_Predefined_Boolean_Nand);
         Add_Binary (Name_Nor, Iir_Predefined_Boolean_Nor);
         Add_Binary (Name_Xor, Iir_Predefined_Boolean_Xor);
         if Flags.Vhdl_Std > Vhdl_87 then
            Add_Binary (Name_Xnor, Iir_Predefined_Boolean_Xnor);
         end if;
         Add_Unary (Name_Not, Iir_Predefined_Boolean_Not);
      elsif Decl = Std_Package.Bit_Type_Declaration then
         Add_Binary (Name_And, Iir_Predefined_Bit_And);
         Add_Binary (Name_Or, Iir_Predefined_Bit_Or);
         Add_Binary (Name_Nand, Iir_Predefined_Bit_Nand);
         Add_Binary (Name_Nor, Iir_Predefined_Bit_Nor);
         Add_Binary (Name_Xor, Iir_Predefined_Bit_Xor);
         if Flags.Vhdl_Std > Vhdl_87 then
            Add_Binary (Name_Xnor, Iir_Predefined_Bit_Xnor);
         end if;
         Add_Unary (Name_Not, Iir_Predefined_Bit_Not);
         if Flags.Vhdl_Std >= Vhdl_08 then
            Add_Binary (Name_Op_Match_Equality,
                        Iir_Predefined_Bit_Match_Equality);
            Add_Binary (Name_Op_Match_Inequality,
                        Iir_Predefined_Bit_Match_Inequality);
            Add_Binary (Name_Op_Match_Less,
                        Iir_Predefined_Bit_Match_Less);
            Add_Binary (Name_Op_Match_Less_Equal,
                        Iir_Predefined_Bit_Match_Less_Equal);
            Add_Binary (Name_Op_Match_Greater,
                        Iir_Predefined_Bit_Match_Greater);
            Add_Binary (Name_Op_Match_Greater_Equal,
                        Iir_Predefined_Bit_Match_Greater_Equal);

            --  LRM08 9.2.9 Condition operator
            --  The unary operator ?? is predefined for type BIT defined in
            --  package STANDARD.
            Add_Operation (Name_Op_Condition, Iir_Predefined_Bit_Condition,
                           Unary_Chain, Std_Package.Boolean_Type_Definition);

         end if;
      elsif Decl = Std_Package.Universal_Real_Type_Declaration then
         declare
            Inter_Chain : Iir;
         begin
            Inter_Chain := Create_Anonymous_Interface (Type_Definition);
            Set_Chain
              (Inter_Chain,
               Create_Anonymous_Interface (Universal_Integer_Type_Definition));
            Add_Operation (Name_Op_Mul, Iir_Predefined_Universal_R_I_Mul,
                           Inter_Chain, Type_Definition);
            Add_Operation (Name_Op_Div, Iir_Predefined_Universal_R_I_Div,
                           Inter_Chain, Type_Definition);
         end;

         declare
            Inter_Chain : Iir;
         begin
            Inter_Chain :=
              Create_Anonymous_Interface (Universal_Integer_Type_Definition);
            Set_Chain (Inter_Chain, Unary_Chain);
            Add_Operation (Name_Op_Mul, Iir_Predefined_Universal_I_R_Mul,
                           Inter_Chain, Type_Definition);
         end;
      end if;
   end Create_Implicit_Operations;
end Vhdl.Sem_Utils;