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--  Evaluation of static expressions.
--  Copyright (C) 2002, 2003, 2004, 2005 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_Deallocation;
with Interfaces;
with Scanner;
with Errorout; use Errorout;
with Name_Table; use Name_Table;
with Str_Table;
with Iirs_Utils; use Iirs_Utils;
with Std_Package; use Std_Package;
with Flags; use Flags;
with Std_Names;
with Ada.Characters.Handling;
with Grt.Fcvt;

package body Evaluation is
   --  If FORCE is true, always return a literal.
   function Eval_Expr_Keep_Orig (Expr : Iir; Force : Boolean) return Iir;

   function Eval_Enum_To_String (Lit : Iir; Orig : Iir) return Iir;
   function Eval_Integer_Image (Val : Iir_Int64; Orig : Iir) return Iir;

   function Eval_Scalar_Compare (Left, Right : Iir) return Compare_Type;

   function Get_Physical_Value (Expr : Iir) return Iir_Int64
   is
      pragma Unsuppress (Overflow_Check);
      Kind : constant Iir_Kind := Get_Kind (Expr);
      Unit : Iir;
   begin
      case Kind is
         when Iir_Kind_Physical_Int_Literal
           | Iir_Kind_Physical_Fp_Literal =>
            --  Extract Unit.
            Unit := Get_Physical_Literal (Get_Physical_Unit (Expr));
            pragma Assert (Get_Physical_Unit (Unit)
                             = Get_Primary_Unit (Get_Type (Unit)));
            case Kind is
               when Iir_Kind_Physical_Int_Literal =>
                  return Get_Value (Expr) * Get_Value (Unit);
               when Iir_Kind_Physical_Fp_Literal =>
                  return Iir_Int64
                    (Get_Fp_Value (Expr) * Iir_Fp64 (Get_Value (Unit)));
               when others =>
                  raise Program_Error;
            end case;
         when Iir_Kind_Unit_Declaration =>
            return Get_Value (Get_Physical_Literal (Expr));
         when others =>
            Error_Kind ("get_physical_value", Expr);
      end case;
   end Get_Physical_Value;

   function Build_Integer (Val : Iir_Int64; Origin : Iir)
     return Iir_Integer_Literal
   is
      Res : Iir_Integer_Literal;
   begin
      Res := Create_Iir (Iir_Kind_Integer_Literal);
      Location_Copy (Res, Origin);
      Set_Value (Res, Val);
      Set_Type (Res, Get_Type (Origin));
      Set_Literal_Origin (Res, Origin);
      Set_Expr_Staticness (Res, Locally);
      return Res;
   end Build_Integer;

   function Build_Floating (Val : Iir_Fp64; Origin : Iir)
     return Iir_Floating_Point_Literal
   is
      Res : Iir_Floating_Point_Literal;
   begin
      Res := Create_Iir (Iir_Kind_Floating_Point_Literal);
      Location_Copy (Res, Origin);
      Set_Fp_Value (Res, Val);
      Set_Type (Res, Get_Type (Origin));
      Set_Literal_Origin (Res, Origin);
      Set_Expr_Staticness (Res, Locally);
      return Res;
   end Build_Floating;

   function Build_Enumeration_Constant (Val : Iir_Index32; Origin : Iir)
     return Iir_Enumeration_Literal
   is
      Enum_Type : constant Iir := Get_Base_Type (Get_Type (Origin));
      Enum_List : constant Iir_Flist :=
        Get_Enumeration_Literal_List (Enum_Type);
      Lit : constant Iir_Enumeration_Literal :=
        Get_Nth_Element (Enum_List, Integer (Val));
      Res : Iir_Enumeration_Literal;
   begin
      Res := Copy_Enumeration_Literal (Lit);
      Location_Copy (Res, Origin);
      Set_Literal_Origin (Res, Origin);
      return Res;
   end Build_Enumeration_Constant;

   function Build_Physical (Val : Iir_Int64; Origin : Iir)
     return Iir_Physical_Int_Literal
   is
      Res : Iir_Physical_Int_Literal;
      Unit_Name : Iir;
   begin
      Res := Create_Iir (Iir_Kind_Physical_Int_Literal);
      Location_Copy (Res, Origin);
      Unit_Name := Get_Primary_Unit (Get_Base_Type (Get_Type (Origin)));
      Set_Physical_Unit (Res, Unit_Name);
      Set_Value (Res, Val);
      Set_Type (Res, Get_Type (Origin));
      Set_Literal_Origin (Res, Origin);
      Set_Expr_Staticness (Res, Locally);
      return Res;
   end Build_Physical;

   function Build_Discrete (Val : Iir_Int64; Origin : Iir) return Iir is
   begin
      case Get_Kind (Get_Type (Origin)) is
         when Iir_Kind_Enumeration_Type_Definition
           | Iir_Kind_Enumeration_Subtype_Definition =>
            return Build_Enumeration_Constant (Iir_Index32 (Val), Origin);
         when Iir_Kind_Integer_Type_Definition
           | Iir_Kind_Integer_Subtype_Definition =>
            return Build_Integer (Val, Origin);
         when others =>
            Error_Kind ("build_discrete", Get_Type (Origin));
      end case;
   end Build_Discrete;

   function Build_String (Val : String8_Id; Len : Nat32; Origin : Iir)
                         return Iir
   is
      Res : Iir;
   begin
      Res := Create_Iir (Iir_Kind_String_Literal8);
      Location_Copy (Res, Origin);
      Set_String8_Id (Res, Val);
      Set_String_Length (Res, Len);
      Set_Type (Res, Get_Type (Origin));
      Set_Literal_Origin (Res, Origin);
      Set_Expr_Staticness (Res, Locally);
      return Res;
   end Build_String;

   --  Build a simple aggregate composed of EL_LIST from ORIGIN.  STYPE is the
   --  type of the aggregate.  DEF_TYPE should be either Null_Iir or STYPE.  It
   --  is set only when a new subtype has been created for the aggregate.
   function Build_Simple_Aggregate (El_List : Iir_Flist;
                                    Origin : Iir;
                                    Stype : Iir;
                                    Def_Type : Iir := Null_Iir)
                                   return Iir_Simple_Aggregate
   is
      Res : Iir_Simple_Aggregate;
   begin
      Res := Create_Iir (Iir_Kind_Simple_Aggregate);
      Location_Copy (Res, Origin);
      Set_Simple_Aggregate_List (Res, El_List);
      Set_Type (Res, Stype);
      Set_Literal_Origin (Res, Origin);
      Set_Expr_Staticness (Res, Locally);
      Set_Literal_Subtype (Res, Def_Type);
      return Res;
   end Build_Simple_Aggregate;

   function Build_Overflow (Origin : Iir; Expr_Type : Iir) return Iir
   is
      Res : Iir;
   begin
      Res := Create_Iir (Iir_Kind_Overflow_Literal);
      Location_Copy (Res, Origin);
      Set_Type (Res, Expr_Type);
      Set_Literal_Origin (Res, Origin);
      Set_Expr_Staticness (Res, Locally);
      return Res;
   end Build_Overflow;

   function Build_Overflow (Origin : Iir) return Iir is
   begin
      return Build_Overflow (Origin, Get_Type (Origin));
   end Build_Overflow;

   function Build_Constant (Val : Iir; Origin : Iir) return Iir
   is
      Res : Iir;
   begin
      --  Note: this must work for any literals, because it may be used to
      --  replace a locally static constant by its initial value.
      case Get_Kind (Val) is
         when Iir_Kind_Integer_Literal =>
            Res := Create_Iir (Iir_Kind_Integer_Literal);
            Set_Value (Res, Get_Value (Val));

         when Iir_Kind_Floating_Point_Literal =>
            Res := Create_Iir (Iir_Kind_Floating_Point_Literal);
            Set_Fp_Value (Res, Get_Fp_Value (Val));

         when Iir_Kind_Enumeration_Literal =>
            return Build_Enumeration_Constant
              (Iir_Index32 (Get_Enum_Pos (Val)), Origin);

         when Iir_Kind_Physical_Int_Literal
           | Iir_Kind_Physical_Fp_Literal =>
            Res := Create_Iir (Iir_Kind_Physical_Int_Literal);
            Set_Physical_Unit (Res, Get_Primary_Unit
                                 (Get_Base_Type (Get_Type (Origin))));
            Set_Value (Res, Get_Physical_Value (Val));

         when Iir_Kind_Unit_Declaration =>
            Res := Create_Iir (Iir_Kind_Physical_Int_Literal);
            Set_Value (Res, Get_Physical_Value (Val));
            Set_Physical_Unit (Res, Get_Primary_Unit (Get_Type (Val)));

         when Iir_Kind_String_Literal8 =>
            Res := Create_Iir (Iir_Kind_String_Literal8);
            Set_String8_Id (Res, Get_String8_Id (Val));
            Set_String_Length (Res, Get_String_Length (Val));

         when Iir_Kind_Simple_Aggregate =>
            Res := Create_Iir (Iir_Kind_Simple_Aggregate);
            Set_Simple_Aggregate_List (Res, Get_Simple_Aggregate_List (Val));

         when Iir_Kind_Overflow_Literal =>
            Res := Create_Iir (Iir_Kind_Overflow_Literal);

         when others =>
            Error_Kind ("build_constant", Val);
      end case;
      Location_Copy (Res, Origin);
      Set_Type (Res, Get_Type (Origin));
      Set_Literal_Origin (Res, Origin);
      Set_Expr_Staticness (Res, Locally);
      return Res;
   end Build_Constant;

   function Copy_Constant (Val : Iir) return Iir
   is
      Res : Iir;
   begin
      Res := Build_Constant (Val, Val);
      Set_Literal_Origin (Res, Null_Iir);
      return Res;
   end Copy_Constant;

   --  FIXME: origin ?
   function Build_Boolean (Cond : Boolean) return Iir is
   begin
      if Cond then
         return Boolean_True;
      else
         return Boolean_False;
      end if;
   end Build_Boolean;

   function Build_Enumeration (Val : Iir_Index32; Origin : Iir)
                              return Iir_Enumeration_Literal
   is
      Enum_Type : constant Iir := Get_Base_Type (Get_Type (Origin));
      Enum_List : constant Iir_Flist :=
        Get_Enumeration_Literal_List (Enum_Type);
   begin
      return Get_Nth_Element (Enum_List, Integer (Val));
   end Build_Enumeration;

   function Build_Enumeration (Val : Boolean; Origin : Iir)
                              return Iir_Enumeration_Literal
   is
      Enum_Type : constant Iir := Get_Base_Type (Get_Type (Origin));
      Enum_List : constant Iir_Flist :=
        Get_Enumeration_Literal_List (Enum_Type);
   begin
      return Get_Nth_Element (Enum_List, Boolean'Pos (Val));
   end Build_Enumeration;

   function Build_Constant_Range (Range_Expr : Iir; Origin : Iir) return Iir
   is
      Res : Iir;
   begin
      Res := Create_Iir (Iir_Kind_Range_Expression);
      Location_Copy (Res, Origin);
      Set_Type (Res, Get_Type (Range_Expr));
      Set_Left_Limit (Res, Get_Left_Limit (Range_Expr));
      Set_Right_Limit (Res, Get_Right_Limit (Range_Expr));
      Set_Direction (Res, Get_Direction (Range_Expr));
      Set_Range_Origin (Res, Origin);
      Set_Expr_Staticness (Res, Locally);
      return Res;
   end Build_Constant_Range;

   function Build_Extreme_Value (Is_Pos : Boolean; Origin : Iir) return Iir
   is
      Orig_Type : constant Iir := Get_Base_Type (Get_Type (Origin));
   begin
      case Get_Kind (Orig_Type) is
         when Iir_Kind_Integer_Type_Definition =>
            if Is_Pos then
               return Build_Integer (Iir_Int64'Last, Origin);
            else
               return Build_Integer (Iir_Int64'First, Origin);
            end if;
         when others =>
            Error_Kind ("build_extreme_value", Orig_Type);
      end case;
   end Build_Extreme_Value;

   --  A_RANGE is a range expression, whose type, location, expr_staticness,
   --  left_limit and direction are set.
   --  Type of A_RANGE must have a range_constraint.
   --  Set the right limit of A_RANGE from LEN.
   procedure Set_Right_Limit_By_Length (A_Range : Iir; Len : Iir_Int64)
   is
      A_Type : constant Iir := Get_Type (A_Range);
      Left : constant Iir := Get_Left_Limit (A_Range);
      Right : Iir;
      Pos : Iir_Int64;
   begin
      pragma Assert (Get_Expr_Staticness (A_Range) = Locally);

      Pos := Eval_Pos (Left);
      case Get_Direction (A_Range) is
         when Iir_To =>
            Pos := Pos + Len - 1;
         when Iir_Downto =>
            Pos := Pos - Len + 1;
      end case;
      if Len > 0
        and then not Eval_Int_In_Range (Pos, Get_Range_Constraint (A_Type))
      then
         Error_Msg_Sem (+A_Range, "range length is beyond subtype length");
         Right := Left;
      else
         -- FIXME: what about nul range?
         Right := Build_Discrete (Pos, A_Range);
         Set_Literal_Origin (Right, Null_Iir);
         Set_Right_Limit_Expr (A_Range, Right);
      end if;
      Set_Right_Limit (A_Range, Right);
   end Set_Right_Limit_By_Length;

   --  Create a range of type A_TYPE whose length is LEN.
   --  Note: only two nodes are created:
   --  * the range_expression (node returned)
   --  * the right bound
   --  The left bound *IS NOT* created, but points to the left bound of A_TYPE.
   function Create_Range_By_Length
     (A_Type : Iir; Len : Iir_Int64; Loc : Location_Type)
     return Iir
   is
      Index_Constraint : Iir;
      Constraint : Iir;
   begin
      --  The left limit must be locally static in order to compute the right
      --  limit.
      pragma Assert (Get_Type_Staticness (A_Type) = Locally);

      Index_Constraint := Get_Range_Constraint (A_Type);
      Constraint := Create_Iir (Iir_Kind_Range_Expression);
      Set_Location (Constraint, Loc);
      Set_Expr_Staticness (Constraint, Locally);
      Set_Type (Constraint, A_Type);
      Set_Left_Limit (Constraint, Get_Left_Limit (Index_Constraint));
      Set_Direction (Constraint, Get_Direction (Index_Constraint));
      Set_Right_Limit_By_Length (Constraint, Len);
      return Constraint;
   end Create_Range_By_Length;

   function Create_Range_Subtype_From_Type (A_Type : Iir; Loc : Location_Type)
                                          return Iir
   is
      Res : Iir;
   begin
      pragma Assert (Get_Type_Staticness (A_Type) = Locally);

      case Get_Kind (A_Type) is
         when Iir_Kind_Enumeration_Type_Definition =>
            Res := Create_Iir (Iir_Kind_Enumeration_Subtype_Definition);
         when Iir_Kind_Integer_Subtype_Definition
           | Iir_Kind_Enumeration_Subtype_Definition =>
            Res := Create_Iir (Get_Kind (A_Type));
         when others =>
            Error_Kind ("create_range_subtype_by_length", A_Type);
      end case;
      Set_Location (Res, Loc);
      Set_Base_Type (Res, Get_Base_Type (A_Type));
      Set_Type_Staticness (Res, Locally);

      return Res;
   end Create_Range_Subtype_From_Type;

   --  Create a subtype of A_TYPE whose length is LEN.
   --  This is used to create subtypes for strings or aggregates.
   function Create_Range_Subtype_By_Length
     (A_Type : Iir; Len : Iir_Int64; Loc : Location_Type)
     return Iir
   is
      Res : Iir;
   begin
      Res := Create_Range_Subtype_From_Type (A_Type, Loc);

      Set_Range_Constraint (Res, Create_Range_By_Length (A_Type, Len, Loc));
      return Res;
   end Create_Range_Subtype_By_Length;

   function Create_Unidim_Array_From_Index
     (Base_Type : Iir; Index_Type : Iir; Loc : Iir)
     return Iir_Array_Subtype_Definition
   is
      Res : Iir_Array_Subtype_Definition;
   begin
      Res := Create_Array_Subtype (Base_Type, Get_Location (Loc));
      Set_Nth_Element (Get_Index_Subtype_List (Res), 0, Index_Type);
      Set_Type_Staticness (Res, Min (Get_Type_Staticness (Res),
                                     Get_Type_Staticness (Index_Type)));
      Set_Constraint_State (Res, Fully_Constrained);
      Set_Index_Constraint_Flag (Res, True);
      return Res;
   end Create_Unidim_Array_From_Index;

   function Create_Unidim_Array_By_Length
     (Base_Type : Iir; Len : Iir_Int64; Loc : Iir)
     return Iir_Array_Subtype_Definition
   is
      Index_Type : constant Iir := Get_Index_Type (Base_Type, 0);
      N_Index_Type : Iir;
   begin
      N_Index_Type := Create_Range_Subtype_By_Length
        (Index_Type, Len, Get_Location (Loc));
      return Create_Unidim_Array_From_Index (Base_Type, N_Index_Type, Loc);
   end Create_Unidim_Array_By_Length;

   procedure Free_Eval_Static_Expr (Res : Iir; Orig : Iir) is
   begin
      if Res /= Orig and then Get_Literal_Origin (Res) = Orig then
         Free_Iir (Res);
      end if;
   end Free_Eval_Static_Expr;

   --  Free the result RES of Eval_String_Literal called with ORIG, if created.
   procedure Free_Eval_String_Literal (Res : Iir; Orig : Iir)
   is
      L : Iir_Flist;
   begin
      if Res /= Orig then
         L := Get_Simple_Aggregate_List (Res);
         Destroy_Iir_Flist (L);
         Free_Iir (Res);
      end if;
   end Free_Eval_String_Literal;

   function String_Literal8_To_Simple_Aggregate (Str : Iir) return Iir
   is
      Element_Type : constant Iir := Get_Base_Type
        (Get_Element_Subtype (Get_Base_Type (Get_Type (Str))));
      Literal_List : constant Iir_Flist :=
        Get_Enumeration_Literal_List (Element_Type);

      Len : constant Nat32 := Get_String_Length (Str);
      Id : constant String8_Id := Get_String8_Id (Str);

      List : Iir_Flist;
      Lit : Iir;
   begin
      List := Create_Iir_Flist (Natural (Len));

      for I in 1 .. Len loop
         Lit := Get_Nth_Element
           (Literal_List, Natural (Str_Table.Element_String8 (Id, I)));
         Set_Nth_Element (List, Natural (I - 1), Lit);
      end loop;
      return Build_Simple_Aggregate (List, Str, Get_Type (Str));
   end String_Literal8_To_Simple_Aggregate;

   --  Return the offset of EXPR in RNG.  A result of 0 means the left bound,
   --  a result of 1 mean the next element after the left bound.
   --  Assume no overflow.
   function Eval_Pos_In_Range (Rng : Iir; Expr : Iir) return Iir_Index32
   is
      Left_Pos : constant Iir_Int64 := Eval_Pos (Get_Left_Limit (Rng));
      Pos : constant Iir_Int64 := Eval_Pos (Expr);
   begin
      case Get_Direction (Rng) is
         when Iir_To =>
            return Iir_Index32 (Pos - Left_Pos);
         when Iir_Downto =>
            return Iir_Index32 (Left_Pos - Pos);
      end case;
   end Eval_Pos_In_Range;

   procedure Build_Array_Choices_Vector
     (Vect : out Iir_Array; Choice_Range : Iir; Choices_Chain : Iir)
   is
      pragma Assert (Vect'First = 0);
      pragma Assert (Vect'Length = Eval_Discrete_Range_Length (Choice_Range));
      Assoc : Iir;
      Choice : Iir;
      Cur_Pos : Natural;
   begin
      --  Initialize Vect (to correctly handle 'others').
      Vect := (others => Null_Iir);

      Assoc := Choices_Chain;
      Cur_Pos := 0;
      Choice := Null_Iir;
      while Is_Valid (Assoc) loop
         if not Get_Same_Alternative_Flag (Assoc) then
            Choice := Assoc;
         end if;
         case Iir_Kinds_Array_Choice (Get_Kind (Assoc)) is
            when Iir_Kind_Choice_By_None =>
               Vect (Cur_Pos) := Choice;
               Cur_Pos := Cur_Pos + 1;
            when Iir_Kind_Choice_By_Range =>
               declare
                  Rng : constant Iir := Get_Choice_Range (Assoc);
                  Rng_Start : Iir;
                  Rng_Len : Iir_Int64;
               begin
                  if Get_Direction (Rng) = Get_Direction (Choice_Range) then
                     Rng_Start := Get_Left_Limit (Rng);
                  else
                     Rng_Start := Get_Right_Limit (Rng);
                  end if;
                  Cur_Pos := Natural
                    (Eval_Pos_In_Range (Choice_Range, Rng_Start));
                  Rng_Len := Eval_Discrete_Range_Length (Rng);
                  for I in 1 .. Rng_Len loop
                     Vect (Cur_Pos) := Choice;
                     Cur_Pos := Cur_Pos + 1;
                  end loop;
               end;
            when Iir_Kind_Choice_By_Expression =>
               Cur_Pos := Natural
                 (Eval_Pos_In_Range (Choice_Range,
                                     Get_Choice_Expression (Assoc)));
               Vect (Cur_Pos) := Choice;
            when Iir_Kind_Choice_By_Others =>
               for I in Vect'Range loop
                  if Vect (I) = Null_Iir then
                     Vect (I) := Choice;
                  end if;
               end loop;
         end case;
         Assoc := Get_Chain (Assoc);
      end loop;
   end Build_Array_Choices_Vector;

   function Aggregate_To_Simple_Aggregate (Aggr : Iir) return Iir
   is
      Aggr_Type : constant Iir := Get_Type (Aggr);
      Index_Type : constant Iir := Get_Index_Type (Aggr_Type, 0);
      Index_Range : constant Iir := Eval_Static_Range (Index_Type);
      Len : constant Iir_Int64 := Eval_Discrete_Range_Length (Index_Range);
      Assocs : constant Iir := Get_Association_Choices_Chain (Aggr);
      Vect : Iir_Array (0 .. Integer (Len - 1));
      List : Iir_Flist;
      Assoc : Iir;
      Expr : Iir;
   begin
      Assoc := Assocs;
      while Is_Valid (Assoc) loop
         if not Get_Same_Alternative_Flag (Assoc) then
            Expr := Get_Associated_Expr (Assoc);
            if Get_Kind (Get_Type (Expr))
              in Iir_Kinds_Scalar_Type_And_Subtype_Definition
            then
               Expr := Eval_Expr_Keep_Orig (Expr, True);
               Set_Associated_Expr (Assoc, Expr);
            end if;
         end if;
         Assoc := Get_Chain (Assoc);
      end loop;

      Build_Array_Choices_Vector (Vect, Index_Range, Assocs);

      List := Create_Iir_Flist (Natural (Len));
      if Len > 0 then
         --  Workaround GNAT GPL2014 compiler bug.
         for I in Vect'Range loop
            Set_Nth_Element (List, I, Get_Associated_Expr (Vect (I)));
         end loop;
      end if;

      return Build_Simple_Aggregate (List, Aggr, Aggr_Type);
   end Aggregate_To_Simple_Aggregate;

   function Eval_String_Literal (Str : Iir) return Iir is
   begin
      case Get_Kind (Str) is
         when Iir_Kind_String_Literal8 =>
            return String_Literal8_To_Simple_Aggregate (Str);

         when Iir_Kind_Aggregate =>
            return Aggregate_To_Simple_Aggregate (Str);

         when Iir_Kind_Simple_Aggregate =>
            return Str;

         when others =>
            Error_Kind ("eval_string_literal", Str);
      end case;
   end Eval_String_Literal;

   function Eval_Monadic_Operator (Orig : Iir; Operand : Iir) return Iir
   is
      pragma Unsuppress (Overflow_Check);
      subtype Iir_Predefined_Vector_Minmax is Iir_Predefined_Functions range
        Iir_Predefined_Vector_Minimum .. Iir_Predefined_Vector_Maximum;

      Func : Iir_Predefined_Functions;
   begin
      if Get_Kind (Operand) = Iir_Kind_Overflow_Literal then
         --  Propagate overflow.
         return Build_Overflow (Orig);
      end if;

      Func := Get_Implicit_Definition (Get_Implementation (Orig));
      case Func is
         when Iir_Predefined_Integer_Negation =>
            return Build_Integer (-Get_Value (Operand), Orig);
         when Iir_Predefined_Integer_Identity =>
            return Build_Integer (Get_Value (Operand), Orig);
         when Iir_Predefined_Integer_Absolute =>
            return Build_Integer (abs Get_Value (Operand), Orig);

         when Iir_Predefined_Floating_Negation =>
            return Build_Floating (-Get_Fp_Value (Operand), Orig);
         when Iir_Predefined_Floating_Identity =>
            return Build_Floating (Get_Fp_Value (Operand), Orig);
         when Iir_Predefined_Floating_Absolute =>
            return Build_Floating (abs Get_Fp_Value (Operand), Orig);

         when Iir_Predefined_Physical_Negation =>
            return Build_Physical (-Get_Physical_Value (Operand), Orig);
         when Iir_Predefined_Physical_Identity =>
            return Build_Physical (Get_Physical_Value (Operand), Orig);
         when Iir_Predefined_Physical_Absolute =>
            return Build_Physical (abs Get_Physical_Value (Operand), Orig);

         when Iir_Predefined_Boolean_Not
           | Iir_Predefined_Bit_Not =>
            return Build_Enumeration (Get_Enum_Pos (Operand) = 0, Orig);

         when Iir_Predefined_TF_Array_Not =>
            declare
               Lit_Val : Iir;
               O_List : Iir_Flist;
               R_List : Iir_Flist;
               El : Iir;
               Lit : Iir;
            begin
               Lit_Val := Eval_String_Literal (Operand);
               O_List := Get_Simple_Aggregate_List (Lit_Val);
               R_List := Create_Iir_Flist (Get_Nbr_Elements (O_List));

               for I in Flist_First .. Flist_Last (O_List) loop
                  El := Get_Nth_Element (O_List, I);
                  case Get_Enum_Pos (El) is
                     when 0 =>
                        Lit := Bit_1;
                     when 1 =>
                        Lit := Bit_0;
                     when others =>
                        raise Internal_Error;
                  end case;
                  Set_Nth_Element (R_List, I, Lit);
               end loop;
               Free_Eval_String_Literal (Lit_Val, Operand);
               return Build_Simple_Aggregate
                 (R_List, Orig, Get_Type (Operand));
            end;

         when Iir_Predefined_Enum_To_String =>
            return Eval_Enum_To_String (Operand, Orig);
         when Iir_Predefined_Integer_To_String =>
            return Eval_Integer_Image (Get_Value (Operand), Orig);

         when Iir_Predefined_Vector_Minimum
           | Iir_Predefined_Vector_Maximum =>
            --  LRM08 5.3.2.4 Predefined operations on array types
            declare
               Saggr : Iir;
               Lits : Iir_Flist;
               Res : Iir;
               El : Iir;
               Cmp : Compare_Type;
            begin
               Saggr := Eval_String_Literal (Operand);
               Lits := Get_Simple_Aggregate_List (Saggr);

               if Get_Nbr_Elements (Lits) = 0 then
                  declare
                     Typ : constant Iir :=
                       Get_Type (Get_Implementation (Orig));
                     Rng : constant Iir := Eval_Static_Range (Typ);
                  begin
                     case Iir_Predefined_Vector_Minmax (Func) is
                        when Iir_Predefined_Vector_Minimum =>
                           Res := Get_High_Limit (Rng);
                        when Iir_Predefined_Vector_Maximum =>
                           Res := Get_Low_Limit (Rng);
                     end case;
                     Res := Eval_Static_Expr (Res);
                  end;
               else
                  Res := Get_Nth_Element (Lits, 0);
                  for I in Flist_First .. Flist_Last (Lits) loop
                     El := Get_Nth_Element (Lits, I);
                     Cmp := Eval_Scalar_Compare (El, Res);
                     case Iir_Predefined_Vector_Minmax (Func) is
                        when Iir_Predefined_Vector_Minimum =>
                           if Cmp <= Compare_Eq then
                              Res := El;
                           end if;
                        when Iir_Predefined_Vector_Maximum =>
                           if Cmp >= Compare_Eq then
                              Res := El;
                           end if;
                     end case;
                  end loop;
               end if;
               Free_Eval_String_Literal (Saggr, Operand);
               return Res;
            end;

         when others =>
            Error_Internal (Orig, "eval_monadic_operator: " &
                            Iir_Predefined_Functions'Image (Func));
      end case;
   exception
      when Constraint_Error =>
         --  Can happen for absolute.
         Warning_Msg_Sem (Warnid_Runtime_Error, +Orig,
                          "arithmetic overflow in static expression");
         return Build_Overflow (Orig);
   end Eval_Monadic_Operator;

   function Eval_Dyadic_Bit_Array_Operator
     (Expr : Iir;
      Left, Right : Iir;
      Func : Iir_Predefined_Dyadic_TF_Array_Functions)
     return Iir
   is
      use Str_Table;
      L_Str : constant String8_Id := Get_String8_Id (Left);
      R_Str : constant String8_Id := Get_String8_Id (Right);
      Len : Nat32;
      Id : String8_Id;
      Res : Iir;
   begin
      Len := Get_String_Length (Left);
      if Len /= Get_String_Length (Right) then
         Warning_Msg_Sem (Warnid_Runtime_Error, +Expr,
                          "length of left and right operands mismatch");
         return Build_Overflow (Expr);
      else
         Id := Create_String8;
         case Func is
            when Iir_Predefined_TF_Array_And =>
               for I in 1 .. Len loop
                  case Element_String8 (L_Str, I) is
                     when 0 =>
                        Append_String8 (0);
                     when 1 =>
                        Append_String8 (Element_String8 (R_Str, I));
                     when others =>
                        raise Internal_Error;
                  end case;
               end loop;
            when Iir_Predefined_TF_Array_Nand =>
               for I in 1 .. Len loop
                  case Element_String8 (L_Str, I) is
                     when 0 =>
                        Append_String8 (1);
                     when 1 =>
                        case Element_String8 (R_Str, I) is
                           when 0 =>
                              Append_String8 (1);
                           when 1 =>
                              Append_String8 (0);
                           when others =>
                              raise Internal_Error;
                        end case;
                     when others =>
                        raise Internal_Error;
                  end case;
               end loop;
            when Iir_Predefined_TF_Array_Or =>
               for I in 1 .. Len loop
                  case Element_String8 (L_Str, I) is
                     when 1 =>
                        Append_String8 (1);
                     when 0 =>
                        Append_String8 (Element_String8 (R_Str, I));
                     when others =>
                        raise Internal_Error;
                  end case;
               end loop;
            when Iir_Predefined_TF_Array_Nor =>
               for I in 1 .. Len loop
                  case Element_String8 (L_Str, I) is
                     when 1 =>
                        Append_String8 (0);
                     when 0 =>
                        case Element_String8 (R_Str, I) is
                           when 0 =>
                              Append_String8 (1);
                           when 1 =>
                              Append_String8 (0);
                           when others =>
                              raise Internal_Error;
                        end case;
                     when others =>
                        raise Internal_Error;
                  end case;
               end loop;
            when Iir_Predefined_TF_Array_Xor =>
               for I in 1 .. Len loop
                  case Element_String8 (L_Str, I) is
                     when 1 =>
                        case Element_String8 (R_Str, I) is
                           when 0 =>
                              Append_String8 (1);
                           when 1 =>
                              Append_String8 (0);
                           when others =>
                              raise Internal_Error;
                        end case;
                     when 0 =>
                        Append_String8 (Element_String8 (R_Str, I));
                     when others =>
                        raise Internal_Error;
                  end case;
               end loop;
            when others =>
               Error_Internal (Expr, "eval_dyadic_bit_array_functions: " &
                               Iir_Predefined_Functions'Image (Func));
         end case;
         Res := Build_String (Id, Len, Expr);

         --  The unconstrained type is replaced by the constrained one.
         Set_Type (Res, Get_Type (Left));
         return Res;
      end if;
   end Eval_Dyadic_Bit_Array_Operator;

   --  Return TRUE if VAL /= 0.
   function Check_Integer_Division_By_Zero (Expr : Iir; Val : Iir)
                                           return Boolean
   is
   begin
      if Get_Value (Val) = 0 then
         Warning_Msg_Sem (Warnid_Runtime_Error, +Expr, "division by 0");
         return False;
      else
         return True;
      end if;
   end Check_Integer_Division_By_Zero;

   function Eval_Shift_Operator
     (Left, Right : Iir; Origin : Iir; Func : Iir_Predefined_Shift_Functions)
     return Iir
   is
      Count : constant Iir_Int64 := Get_Value (Right);
      Arr_List : constant Iir_Flist := Get_Simple_Aggregate_List (Left);
      Len : constant Natural := Get_Nbr_Elements (Arr_List);
      Cnt : Natural;
      Res_List : Iir_Flist;
      Dir_Left : Boolean;
      E : Iir;
   begin
      --  LRM93 7.2.3
      --  That is, if R is 0 or if L is a null array, the return value is L.
      if Count = 0 or Len = 0 then
         return Build_Simple_Aggregate (Arr_List, Origin, Get_Type (Left));
      end if;
      case Func is
         when Iir_Predefined_Array_Sll
           | Iir_Predefined_Array_Sla
           | Iir_Predefined_Array_Rol =>
            Dir_Left := True;
         when Iir_Predefined_Array_Srl
           | Iir_Predefined_Array_Sra
           | Iir_Predefined_Array_Ror =>
            Dir_Left := False;
      end case;
      if Count < 0 then
         Cnt := Natural (-Count);
         Dir_Left := not Dir_Left;
      else
         Cnt := Natural (Count);
      end if;

      case Func is
         when Iir_Predefined_Array_Sll
           | Iir_Predefined_Array_Srl =>
            declare
               Enum_List : constant Iir_Flist :=
                 Get_Enumeration_Literal_List
                 (Get_Base_Type (Get_Element_Subtype (Get_Type (Left))));
            begin
               E := Get_Nth_Element (Enum_List, 0);
            end;
         when Iir_Predefined_Array_Sla
           | Iir_Predefined_Array_Sra =>
            if Dir_Left then
               E := Get_Nth_Element (Arr_List, Len - 1);
            else
               E := Get_Nth_Element (Arr_List, 0);
            end if;
         when Iir_Predefined_Array_Rol
           | Iir_Predefined_Array_Ror =>
            Cnt := Cnt mod Len;
            if not Dir_Left then
               Cnt := (Len - Cnt) mod Len;
            end if;
      end case;

      Res_List := Create_Iir_Flist (Len);

      case Func is
         when Iir_Predefined_Array_Sll
           | Iir_Predefined_Array_Srl
           | Iir_Predefined_Array_Sla
           | Iir_Predefined_Array_Sra =>
            if Dir_Left then
               if Cnt < Len then
                  for I in Cnt .. Len - 1 loop
                     Set_Nth_Element
                       (Res_List, I - Cnt, Get_Nth_Element (Arr_List, I));
                  end loop;
               else
                  Cnt := Len;
               end if;
               for I in 0 .. Cnt - 1 loop
                  Set_Nth_Element (Res_List, Len - Cnt + I, E);
               end loop;
            else
               if Cnt > Len then
                  Cnt := Len;
               end if;
               for I in 0 .. Cnt - 1 loop
                  Set_Nth_Element (Res_List, I, E);
               end loop;
               for I in Cnt .. Len - 1 loop
                  Set_Nth_Element
                    (Res_List, I, Get_Nth_Element (Arr_List, I - Cnt));
               end loop;
            end if;
         when Iir_Predefined_Array_Rol
           | Iir_Predefined_Array_Ror =>
            for I in 1 .. Len loop
               Set_Nth_Element
                 (Res_List, I - 1, Get_Nth_Element (Arr_List, Cnt));
               Cnt := Cnt + 1;
               if Cnt = Len then
                  Cnt := 0;
               end if;
            end loop;
      end case;
      return Build_Simple_Aggregate (Res_List, Origin, Get_Type (Left));
   end Eval_Shift_Operator;

   --  Note: operands must be locally static.
   function Eval_Concatenation
     (Left, Right : Iir; Orig : Iir; Func : Iir_Predefined_Concat_Functions)
     return Iir
   is
      Res_List : Iir_Flist;
      Res_Len : Natural;
      Res_Type : Iir;
      Origin_Type : Iir;
      Left_Aggr, Right_Aggr : Iir;
      Left_List, Right_List : Iir_Flist;
      Left_Len, Right_Len : Natural;
   begin
      --  Compute length of the result.
      --  Left:
      case Func is
         when Iir_Predefined_Element_Array_Concat
           | Iir_Predefined_Element_Element_Concat =>
            Left_Len := 1;
         when Iir_Predefined_Array_Element_Concat
           | Iir_Predefined_Array_Array_Concat =>
            Left_Aggr := Eval_String_Literal (Left);
            Left_List := Get_Simple_Aggregate_List (Left_Aggr);
            Left_Len := Get_Nbr_Elements (Left_List);
      end case;
      --  Right:
      case Func is
         when Iir_Predefined_Array_Element_Concat
           | Iir_Predefined_Element_Element_Concat =>
            Right_Len := 1;
         when Iir_Predefined_Element_Array_Concat
           | Iir_Predefined_Array_Array_Concat =>
            Right_Aggr := Eval_String_Literal (Right);
            Right_List := Get_Simple_Aggregate_List (Right_Aggr);
            Right_Len := Get_Nbr_Elements (Right_List);
      end case;

      Res_Len := Left_Len + Right_Len;
      Res_List := Create_Iir_Flist (Res_Len);
      --  Do the concatenation.
      --  Left:
      case Func is
         when Iir_Predefined_Element_Array_Concat
           | Iir_Predefined_Element_Element_Concat =>
            Set_Nth_Element (Res_List, 0, Left);
         when Iir_Predefined_Array_Element_Concat
           | Iir_Predefined_Array_Array_Concat =>
            for I in 0 .. Left_Len - 1 loop
               Set_Nth_Element (Res_List, I, Get_Nth_Element (Left_List, I));
            end loop;
            Free_Eval_String_Literal (Left_Aggr, Left);
      end case;
      --  Right:
      case Func is
         when Iir_Predefined_Array_Element_Concat
           | Iir_Predefined_Element_Element_Concat =>
            Set_Nth_Element (Res_List, Left_Len, Right);
         when Iir_Predefined_Element_Array_Concat
           | Iir_Predefined_Array_Array_Concat =>
            for I in 0 .. Right_Len - 1 loop
               Set_Nth_Element
                 (Res_List, Left_Len + I, Get_Nth_Element (Right_List, I));
            end loop;
            Free_Eval_String_Literal (Right_Aggr, Right);
      end case;

      --  Compute subtype...
      Origin_Type := Get_Type (Orig);
      Res_Type := Null_Iir;
      if Func = Iir_Predefined_Array_Array_Concat
        and then Left_Len = 0
      then
         if Flags.Vhdl_Std = Vhdl_87 then
            --  LRM87 7.2.3
            --  [...], unless the left operand is a null array, in which case
            --  the result of the concatenation is the right operand.
            Res_Type := Get_Type (Right);
         else
            --  LRM93 7.2.4
            --  If both operands are null arrays, then the result of the
            --  concatenation is the right operand.
            if Get_Nbr_Elements (Right_List) = 0 then
               Res_Type := Get_Type (Right);
            end if;
         end if;
      end if;
      if Res_Type = Null_Iir then
         if Flags.Vhdl_Std = Vhdl_87
           and then (Func = Iir_Predefined_Array_Array_Concat
                     or Func = Iir_Predefined_Array_Element_Concat)
         then
            --  LRM87 7.2.3
            --  The left bound of the result is the left operand, [...]
            --
            --  LRM87 7.2.3
            --  The direction of the result is the direction of the left
            --  operand, [...]
            declare
               Left_Index : constant Iir :=
                 Get_Index_Type (Get_Type (Left), 0);
               Left_Range : constant Iir :=
                 Get_Range_Constraint (Left_Index);
               Ret_Type : constant Iir :=
                 Get_Return_Type (Get_Implementation (Orig));
               A_Range : Iir;
               Index_Type : Iir;
            begin
               A_Range := Create_Iir (Iir_Kind_Range_Expression);
               Set_Type (A_Range, Get_Index_Type (Ret_Type, 0));
               Set_Expr_Staticness (A_Range, Locally);
               Set_Left_Limit (A_Range, Get_Left_Limit (Left_Range));
               Set_Direction (A_Range, Get_Direction (Left_Range));
               Location_Copy (A_Range, Orig);
               Set_Right_Limit_By_Length (A_Range, Iir_Int64 (Res_Len));
               Index_Type := Create_Range_Subtype_From_Type
                 (Left_Index, Get_Location (Orig));
               Set_Range_Constraint (Index_Type, A_Range);
               Res_Type := Create_Unidim_Array_From_Index
                 (Origin_Type, Index_Type, Orig);
            end;
         else
            --  LRM93 7.2.4
            --  Otherwise, the direction and bounds of the result are
            --  determined as follows: let S be the index subtype of the base
            --  type of the result.  The direction of the result of the
            --  concatenation is the direction of S, and the left bound of the
            --  result is S'LEFT.
            Res_Type := Create_Unidim_Array_By_Length
              (Origin_Type, Iir_Int64 (Res_Len), Orig);
         end if;
      end if;
      --  FIXME: this is not necessarily a string, it may be an aggregate if
      --  element type is not a character type.
      return Build_Simple_Aggregate (Res_List, Orig, Res_Type, Res_Type);
   end Eval_Concatenation;

   function Eval_Scalar_Compare (Left, Right : Iir) return Compare_Type
   is
      Ltype : constant Iir := Get_Base_Type (Get_Type (Left));
   begin
      pragma Assert
        (Get_Kind (Ltype) = Get_Kind (Get_Base_Type (Get_Type (Right))));

      case Get_Kind (Ltype) is
         when Iir_Kind_Enumeration_Type_Definition =>
            declare
               L_Pos : constant Iir_Int32 := Get_Enum_Pos (Left);
               R_Pos : constant Iir_Int32 := Get_Enum_Pos (Right);
            begin
               if L_Pos = R_Pos then
                  return Compare_Eq;
               else
                  if L_Pos < R_Pos then
                     return Compare_Lt;
                  else
                     return Compare_Gt;
                  end if;
               end if;
            end;
         when Iir_Kind_Physical_Type_Definition =>
            declare
               L_Val : constant Iir_Int64 := Get_Physical_Value (Left);
               R_Val : constant Iir_Int64 := Get_Physical_Value (Right);
            begin
               if L_Val = R_Val then
                  return Compare_Eq;
               else
                  if L_Val < R_Val then
                     return Compare_Lt;
                  else
                     return Compare_Gt;
                  end if;
               end if;
            end;
         when Iir_Kind_Integer_Type_Definition =>
            declare
               L_Val : constant Iir_Int64 := Get_Value (Left);
               R_Val : constant Iir_Int64 := Get_Value (Right);
            begin
               if L_Val = R_Val then
                  return Compare_Eq;
               else
                  if L_Val < R_Val then
                     return Compare_Lt;
                  else
                     return Compare_Gt;
                  end if;
               end if;
            end;
         when Iir_Kind_Floating_Type_Definition =>
            declare
               L_Val : constant Iir_Fp64 := Get_Fp_Value (Left);
               R_Val : constant Iir_Fp64 := Get_Fp_Value (Right);
            begin
               if L_Val = R_Val then
                  return Compare_Eq;
               else
                  if L_Val < R_Val then
                     return Compare_Lt;
                  else
                     return Compare_Gt;
                  end if;
               end if;
            end;
         when others =>
            Error_Kind ("eval_scalar_compare", Ltype);
      end case;
   end Eval_Scalar_Compare;

   function Eval_Array_Compare (Left, Right : Iir) return Compare_Type is
   begin
      if Get_Kind (Left) = Iir_Kind_String_Literal8
        and then Get_Kind (Right) = Iir_Kind_String_Literal8
      then
         --  Common case: both parameters are strings.
         declare
            L_Id : constant String8_Id := Get_String8_Id (Left);
            R_Id : constant String8_Id := Get_String8_Id (Right);
            L_Len : constant Int32 := Get_String_Length (Left);
            R_Len : constant Int32 := Get_String_Length (Right);
            L_El, R_El : Nat8;
            P : Nat32;
         begin
            P := 1;
            while P <= L_Len and P <= R_Len loop
               L_El := Str_Table.Element_String8 (L_Id, P);
               R_El := Str_Table.Element_String8 (R_Id, P);
               if L_El /= R_El then
                  if L_El < R_El then
                     return Compare_Lt;
                  else
                     return Compare_Gt;
                  end if;
               end if;
               P := P + 1;
            end loop;
            if L_Len = R_Len then
               return Compare_Eq;
            elsif L_Len < R_Len then
               return Compare_Lt;
            else
               return Compare_Gt;
            end if;
         end;
      else
         --  General case.
         declare
            Left_Val, Right_Val : Iir;
            R_List, L_List : Iir_Flist;
            R_Len, L_Len : Natural;
            P : Natural;
            Res : Compare_Type;
         begin
            Left_Val := Eval_String_Literal (Left);
            Right_Val := Eval_String_Literal (Right);

            L_List := Get_Simple_Aggregate_List (Left_Val);
            R_List := Get_Simple_Aggregate_List (Right_Val);
            L_Len := Get_Nbr_Elements (L_List);
            R_Len := Get_Nbr_Elements (R_List);

            Res := Compare_Eq;
            P := 0;
            while P < L_Len and P < R_Len loop
               Res := Eval_Scalar_Compare (Get_Nth_Element (L_List, P),
                                             Get_Nth_Element (R_List, P));
               exit when Res /= Compare_Eq;
               P := P + 1;
            end loop;
            if Res = Compare_Eq then
               if L_Len < R_Len then
                  Res := Compare_Lt;
               elsif L_Len > R_Len then
                  Res := Compare_Gt;
               end if;
            end if;

            Free_Eval_Static_Expr (Left_Val, Left);
            Free_Eval_Static_Expr (Right_Val, Right);

            return Res;
         end;
      end if;
   end Eval_Array_Compare;

   --  ORIG is either a dyadic operator or a function call.
   function Eval_Dyadic_Operator (Orig : Iir; Imp : Iir; Left, Right : Iir)
     return Iir
   is
      pragma Unsuppress (Overflow_Check);
      Func : constant Iir_Predefined_Functions :=
        Get_Implicit_Definition (Imp);
   begin
      if Get_Kind (Left) = Iir_Kind_Overflow_Literal
        or else Get_Kind (Right) = Iir_Kind_Overflow_Literal
      then
         return Build_Overflow (Orig);
      end if;

      case Func is
         when Iir_Predefined_Integer_Plus =>
            return Build_Integer (Get_Value (Left) + Get_Value (Right), Orig);
         when Iir_Predefined_Integer_Minus =>
            return Build_Integer (Get_Value (Left) - Get_Value (Right), Orig);
         when Iir_Predefined_Integer_Mul =>
            return Build_Integer (Get_Value (Left) * Get_Value (Right), Orig);
         when Iir_Predefined_Integer_Div =>
            if Check_Integer_Division_By_Zero (Orig, Right) then
               return Build_Integer
                 (Get_Value (Left) / Get_Value (Right), Orig);
            else
               return Build_Overflow (Orig);
            end if;
         when Iir_Predefined_Integer_Mod =>
            if Check_Integer_Division_By_Zero (Orig, Right) then
               return Build_Integer
                 (Get_Value (Left) mod Get_Value (Right), Orig);
            else
               return Build_Overflow (Orig);
            end if;
         when Iir_Predefined_Integer_Rem =>
            if Check_Integer_Division_By_Zero (Orig, Right) then
               return Build_Integer
                 (Get_Value (Left) rem Get_Value (Right), Orig);
            else
               return Build_Overflow (Orig);
            end if;
         when Iir_Predefined_Integer_Exp =>
            return Build_Integer
              (Get_Value (Left) ** Integer (Get_Value (Right)), Orig);

         when Iir_Predefined_Integer_Equality =>
            return Build_Boolean (Get_Value (Left) = Get_Value (Right));
         when Iir_Predefined_Integer_Inequality =>
            return Build_Boolean (Get_Value (Left) /= Get_Value (Right));
         when Iir_Predefined_Integer_Greater_Equal =>
            return Build_Boolean (Get_Value (Left) >= Get_Value (Right));
         when Iir_Predefined_Integer_Greater =>
            return Build_Boolean (Get_Value (Left) > Get_Value (Right));
         when Iir_Predefined_Integer_Less_Equal =>
            return Build_Boolean (Get_Value (Left) <= Get_Value (Right));
         when Iir_Predefined_Integer_Less =>
            return Build_Boolean (Get_Value (Left) < Get_Value (Right));

         when Iir_Predefined_Integer_Minimum =>
            if Get_Value (Left) < Get_Value (Right) then
               return Left;
            else
               return Right;
            end if;
         when Iir_Predefined_Integer_Maximum =>
            if Get_Value (Left) > Get_Value (Right) then
               return Left;
            else
               return Right;
            end if;

         when Iir_Predefined_Floating_Equality =>
            return Build_Boolean (Get_Fp_Value (Left) = Get_Fp_Value (Right));
         when Iir_Predefined_Floating_Inequality =>
            return Build_Boolean (Get_Fp_Value (Left) /= Get_Fp_Value (Right));
         when Iir_Predefined_Floating_Greater =>
            return Build_Boolean (Get_Fp_Value (Left) > Get_Fp_Value (Right));
         when Iir_Predefined_Floating_Greater_Equal =>
            return Build_Boolean (Get_Fp_Value (Left) >= Get_Fp_Value (Right));
         when Iir_Predefined_Floating_Less =>
            return Build_Boolean (Get_Fp_Value (Left) < Get_Fp_Value (Right));
         when Iir_Predefined_Floating_Less_Equal =>
            return Build_Boolean (Get_Fp_Value (Left) <= Get_Fp_Value (Right));

         when Iir_Predefined_Floating_Minus =>
            return Build_Floating
              (Get_Fp_Value (Left) - Get_Fp_Value (Right), Orig);
         when Iir_Predefined_Floating_Plus =>
            return Build_Floating
              (Get_Fp_Value (Left) + Get_Fp_Value (Right), Orig);
         when Iir_Predefined_Floating_Mul =>
            return Build_Floating
              (Get_Fp_Value (Left) * Get_Fp_Value (Right), Orig);
         when Iir_Predefined_Floating_Div =>
            if Get_Fp_Value (Right) = 0.0 then
               Warning_Msg_Sem (Warnid_Runtime_Error, +Orig,
                                "right operand of division is 0");
               return Build_Overflow (Orig);
            else
               return Build_Floating
                 (Get_Fp_Value (Left) / Get_Fp_Value (Right), Orig);
            end if;
         when Iir_Predefined_Floating_Exp =>
            declare
               Exp : Iir_Int64;
               Res : Iir_Fp64;
               Val : Iir_Fp64;
            begin
               Res := 1.0;
               Val := Get_Fp_Value (Left);
               --  LRM08 9.2.8 Misellaneous operators
               --  Exponentiation with an integer exponent is equivalent to
               --  repeated multiplication of the left operand by itself for
               --  a number of times indicated by the absolute value of the
               --  exponent and from left to right; [...]
               --  GHDL: use the standard power-of-2 approach.  This is not
               --  strictly equivalent however.
               Exp := abs Get_Value (Right);
               while Exp /= 0 loop
                  if Exp mod 2 = 1 then
                     Res := Res * Val;
                  end if;
                  Exp := Exp / 2;
                  Val := Val * Val;
               end loop;
               --  LRM08 9.2.8 Misellaneous operators
               --  [...] if the exponent is negative then the result is the
               --  reciprocal of that [...]
               if Get_Value (Right) < 0 then
                  Res := 1.0 / Res;
               end if;
               return Build_Floating (Res, Orig);
            end;

         when Iir_Predefined_Floating_Minimum =>
            if Get_Fp_Value (Left) < Get_Fp_Value (Right) then
               return Left;
            else
               return Right;
            end if;
         when Iir_Predefined_Floating_Maximum =>
            if Get_Fp_Value (Left) > Get_Fp_Value (Right) then
               return Left;
            else
               return Right;
            end if;

         when Iir_Predefined_Physical_Equality =>
            return Build_Boolean
              (Get_Physical_Value (Left) = Get_Physical_Value (Right));
         when Iir_Predefined_Physical_Inequality =>
            return Build_Boolean
              (Get_Physical_Value (Left) /= Get_Physical_Value (Right));
         when Iir_Predefined_Physical_Greater_Equal =>
            return Build_Boolean
              (Get_Physical_Value (Left) >= Get_Physical_Value (Right));
         when Iir_Predefined_Physical_Greater =>
            return Build_Boolean
              (Get_Physical_Value (Left) > Get_Physical_Value (Right));
         when Iir_Predefined_Physical_Less_Equal =>
            return Build_Boolean
              (Get_Physical_Value (Left) <= Get_Physical_Value (Right));
         when Iir_Predefined_Physical_Less =>
            return Build_Boolean
              (Get_Physical_Value (Left) < Get_Physical_Value (Right));

         when Iir_Predefined_Physical_Physical_Div =>
            return Build_Integer
              (Get_Physical_Value (Left) / Get_Physical_Value (Right), Orig);
         when Iir_Predefined_Physical_Integer_Div =>
            return Build_Physical
              (Get_Physical_Value (Left) / Get_Value (Right), Orig);
         when Iir_Predefined_Physical_Minus =>
            return Build_Physical
              (Get_Physical_Value (Left) - Get_Physical_Value (Right), Orig);
         when Iir_Predefined_Physical_Plus =>
            return Build_Physical
              (Get_Physical_Value (Left) + Get_Physical_Value (Right), Orig);
         when Iir_Predefined_Integer_Physical_Mul =>
            return Build_Physical
              (Get_Value (Left) * Get_Physical_Value (Right), Orig);
         when Iir_Predefined_Physical_Integer_Mul =>
            return Build_Physical
              (Get_Physical_Value (Left) * Get_Value (Right), Orig);
         when Iir_Predefined_Real_Physical_Mul =>
            --  FIXME: overflow??
            return Build_Physical
              (Iir_Int64 (Get_Fp_Value (Left)
                          * Iir_Fp64 (Get_Physical_Value (Right))), Orig);
         when Iir_Predefined_Physical_Real_Mul =>
            --  FIXME: overflow??
            return Build_Physical
              (Iir_Int64 (Iir_Fp64 (Get_Physical_Value (Left))
                          * Get_Fp_Value (Right)), Orig);
         when Iir_Predefined_Physical_Real_Div =>
            --  FIXME: overflow??
            return Build_Physical
              (Iir_Int64 (Iir_Fp64 (Get_Physical_Value (Left))
                          / Get_Fp_Value (Right)), Orig);

         when Iir_Predefined_Physical_Minimum =>
            return Build_Physical (Iir_Int64'Min (Get_Physical_Value (Left),
                                                  Get_Physical_Value (Right)),
                                   Orig);
         when Iir_Predefined_Physical_Maximum =>
            return Build_Physical (Iir_Int64'Max (Get_Physical_Value (Left),
                                                  Get_Physical_Value (Right)),
                                   Orig);

         when Iir_Predefined_Element_Array_Concat
           | Iir_Predefined_Array_Element_Concat
           | Iir_Predefined_Array_Array_Concat
           | Iir_Predefined_Element_Element_Concat =>
            return Eval_Concatenation (Left, Right, Orig, Func);

         when Iir_Predefined_Enum_Equality
           | Iir_Predefined_Bit_Match_Equality =>
            return Build_Enumeration
              (Get_Enum_Pos (Left) = Get_Enum_Pos (Right), Orig);
         when Iir_Predefined_Enum_Inequality
           | Iir_Predefined_Bit_Match_Inequality =>
            return Build_Enumeration
              (Get_Enum_Pos (Left) /= Get_Enum_Pos (Right), Orig);
         when Iir_Predefined_Enum_Greater_Equal
           | Iir_Predefined_Bit_Match_Greater_Equal =>
            return Build_Enumeration
              (Get_Enum_Pos (Left) >= Get_Enum_Pos (Right), Orig);
         when Iir_Predefined_Enum_Greater
           | Iir_Predefined_Bit_Match_Greater =>
            return Build_Enumeration
              (Get_Enum_Pos (Left) > Get_Enum_Pos (Right), Orig);
         when Iir_Predefined_Enum_Less_Equal
           | Iir_Predefined_Bit_Match_Less_Equal =>
            return Build_Enumeration
              (Get_Enum_Pos (Left) <= Get_Enum_Pos (Right), Orig);
         when Iir_Predefined_Enum_Less
           | Iir_Predefined_Bit_Match_Less =>
            return Build_Enumeration
              (Get_Enum_Pos (Left) < Get_Enum_Pos (Right), Orig);

         when Iir_Predefined_Enum_Minimum =>
            if Get_Enum_Pos (Left) < Get_Enum_Pos (Right) then
               return Left;
            else
               return Right;
            end if;
         when Iir_Predefined_Enum_Maximum =>
            if Get_Enum_Pos (Left) > Get_Enum_Pos (Right) then
               return Left;
            else
               return Right;
            end if;

         when Iir_Predefined_Boolean_And
           | Iir_Predefined_Bit_And =>
            return Build_Enumeration
              (Get_Enum_Pos (Left) = 1 and Get_Enum_Pos (Right) = 1, Orig);
         when Iir_Predefined_Boolean_Nand
           | Iir_Predefined_Bit_Nand =>
            return Build_Enumeration
              (not (Get_Enum_Pos (Left) = 1 and Get_Enum_Pos (Right) = 1),
               Orig);
         when Iir_Predefined_Boolean_Or
           | Iir_Predefined_Bit_Or =>
            return Build_Enumeration
              (Get_Enum_Pos (Left) = 1 or Get_Enum_Pos (Right) = 1, Orig);
         when Iir_Predefined_Boolean_Nor
           | Iir_Predefined_Bit_Nor =>
            return Build_Enumeration
              (not (Get_Enum_Pos (Left) = 1 or Get_Enum_Pos (Right) = 1),
               Orig);
         when Iir_Predefined_Boolean_Xor
           | Iir_Predefined_Bit_Xor =>
            return Build_Enumeration
              (Get_Enum_Pos (Left) = 1 xor Get_Enum_Pos (Right) = 1, Orig);
         when Iir_Predefined_Boolean_Xnor
           | Iir_Predefined_Bit_Xnor =>
            return Build_Enumeration
              (not (Get_Enum_Pos (Left) = 1 xor Get_Enum_Pos (Right) = 1),
               Orig);

         when Iir_Predefined_Dyadic_TF_Array_Functions =>
            --  FIXME: only for bit ?
            return Eval_Dyadic_Bit_Array_Operator (Orig, Left, Right, Func);

         when Iir_Predefined_Universal_R_I_Mul =>
            return Build_Floating
              (Get_Fp_Value (Left) * Iir_Fp64 (Get_Value (Right)), Orig);
         when Iir_Predefined_Universal_I_R_Mul =>
            return Build_Floating
              (Iir_Fp64 (Get_Value (Left)) * Get_Fp_Value (Right), Orig);
         when Iir_Predefined_Universal_R_I_Div =>
            return Build_Floating
              (Get_Fp_Value (Left) / Iir_Fp64 (Get_Value (Right)), Orig);

         when Iir_Predefined_Array_Sll
           | Iir_Predefined_Array_Srl
           | Iir_Predefined_Array_Sla
           | Iir_Predefined_Array_Sra
           | Iir_Predefined_Array_Rol
           | Iir_Predefined_Array_Ror =>
            declare
               Left_Aggr : Iir;
               Res : Iir;
            begin
               Left_Aggr := Eval_String_Literal (Left);
               Res := Eval_Shift_Operator (Left_Aggr, Right, Orig, Func);
               Free_Eval_String_Literal (Left_Aggr, Left);
               return Res;
            end;

         when Iir_Predefined_Array_Equality =>
            return Build_Boolean
              (Eval_Array_Compare (Left, Right) = Compare_Eq);
         when Iir_Predefined_Array_Inequality =>
            return Build_Boolean
              (Eval_Array_Compare (Left, Right) /= Compare_Eq);
         when Iir_Predefined_Array_Less =>
            return Build_Boolean
              (Eval_Array_Compare (Left, Right) = Compare_Lt);
         when Iir_Predefined_Array_Less_Equal =>
            return Build_Boolean
              (Eval_Array_Compare (Left, Right) <= Compare_Eq);
         when Iir_Predefined_Array_Greater =>
            return Build_Boolean
              (Eval_Array_Compare (Left, Right) = Compare_Gt);
         when Iir_Predefined_Array_Greater_Equal =>
            return Build_Boolean
              (Eval_Array_Compare (Left, Right) >= Compare_Eq);

         when Iir_Predefined_Boolean_Not
           | Iir_Predefined_Boolean_Rising_Edge
           | Iir_Predefined_Boolean_Falling_Edge
           | Iir_Predefined_Bit_Not
           | Iir_Predefined_Bit_Rising_Edge
           | Iir_Predefined_Bit_Falling_Edge
           | Iir_Predefined_Integer_Absolute
           | Iir_Predefined_Integer_Identity
           | Iir_Predefined_Integer_Negation
           | Iir_Predefined_Floating_Absolute
           | Iir_Predefined_Floating_Negation
           | Iir_Predefined_Floating_Identity
           | Iir_Predefined_Physical_Absolute
           | Iir_Predefined_Physical_Identity
           | Iir_Predefined_Physical_Negation
           | Iir_Predefined_Error
           | Iir_Predefined_Record_Equality
           | Iir_Predefined_Record_Inequality
           | Iir_Predefined_Access_Equality
           | Iir_Predefined_Access_Inequality
           | Iir_Predefined_TF_Array_Not
           | Iir_Predefined_Now_Function
           | Iir_Predefined_Deallocate
           | Iir_Predefined_Write
           | Iir_Predefined_Read
           | Iir_Predefined_Read_Length
           | Iir_Predefined_Flush
           | Iir_Predefined_File_Open
           | Iir_Predefined_File_Open_Status
           | Iir_Predefined_File_Close
           | Iir_Predefined_Endfile
           | Iir_Predefined_Array_Char_To_String
           | Iir_Predefined_Bit_Vector_To_Ostring
           | Iir_Predefined_Bit_Vector_To_Hstring =>
            --  Not binary or never locally static.
            Error_Internal (Orig, "eval_dyadic_operator: " &
                              Iir_Predefined_Functions'Image (Func));

         when Iir_Predefined_Bit_Condition =>
            raise Internal_Error;

         when Iir_Predefined_Array_Minimum
           | Iir_Predefined_Array_Maximum
           | Iir_Predefined_Vector_Minimum
           | Iir_Predefined_Vector_Maximum =>
            raise Internal_Error;

         when Iir_Predefined_Std_Ulogic_Match_Equality
           | Iir_Predefined_Std_Ulogic_Match_Inequality
           | Iir_Predefined_Std_Ulogic_Match_Less
           | Iir_Predefined_Std_Ulogic_Match_Less_Equal
           | Iir_Predefined_Std_Ulogic_Match_Greater
           | Iir_Predefined_Std_Ulogic_Match_Greater_Equal =>
            -- TODO
            raise Internal_Error;

         when Iir_Predefined_Enum_To_String
           | Iir_Predefined_Integer_To_String
           | Iir_Predefined_Floating_To_String
           | Iir_Predefined_Real_To_String_Digits
           | Iir_Predefined_Real_To_String_Format
           | Iir_Predefined_Physical_To_String
           | Iir_Predefined_Time_To_String_Unit =>
            --  TODO
            raise Internal_Error;

         when Iir_Predefined_TF_Array_Element_And
           | Iir_Predefined_TF_Element_Array_And
           | Iir_Predefined_TF_Array_Element_Or
           | Iir_Predefined_TF_Element_Array_Or
           | Iir_Predefined_TF_Array_Element_Nand
           | Iir_Predefined_TF_Element_Array_Nand
           | Iir_Predefined_TF_Array_Element_Nor
           | Iir_Predefined_TF_Element_Array_Nor
           | Iir_Predefined_TF_Array_Element_Xor
           | Iir_Predefined_TF_Element_Array_Xor
           | Iir_Predefined_TF_Array_Element_Xnor
           | Iir_Predefined_TF_Element_Array_Xnor =>
            --  TODO
            raise Internal_Error;

         when Iir_Predefined_TF_Reduction_And
           | Iir_Predefined_TF_Reduction_Or
           | Iir_Predefined_TF_Reduction_Nand
           | Iir_Predefined_TF_Reduction_Nor
           | Iir_Predefined_TF_Reduction_Xor
           | Iir_Predefined_TF_Reduction_Xnor
           | Iir_Predefined_TF_Reduction_Not =>
            --  TODO
            raise Internal_Error;

         when Iir_Predefined_Bit_Array_Match_Equality
           | Iir_Predefined_Bit_Array_Match_Inequality
           | Iir_Predefined_Std_Ulogic_Array_Match_Equality
           | Iir_Predefined_Std_Ulogic_Array_Match_Inequality =>
            --  TODO
            raise Internal_Error;

         when Iir_Predefined_Explicit =>
            raise Internal_Error;
      end case;
   exception
      when Constraint_Error =>
         Warning_Msg_Sem (Warnid_Runtime_Error, +Orig,
                          "arithmetic overflow in static expression");
         return Build_Overflow (Orig);
   end Eval_Dyadic_Operator;

   --  Get the parameter of an attribute, or 1 if doesn't exist.
   function Eval_Attribute_Parameter_Or_1 (Attr : Iir) return Natural
   is
      Parameter : constant Iir := Get_Parameter (Attr);
   begin
      if Is_Null (Parameter) or else Is_Error (Parameter) then
         return 1;
      else
         return Natural (Get_Value (Parameter));
      end if;
   end Eval_Attribute_Parameter_Or_1;

   --  Evaluate any array attribute, return the type for the prefix.
   function Eval_Array_Attribute (Attr : Iir) return Iir
   is
      Prefix : Iir;
      Prefix_Type : Iir;
      Dim : Natural;
   begin
      Prefix := Get_Prefix (Attr);
      case Get_Kind (Prefix) is
         when Iir_Kinds_Object_Declaration --  FIXME: remove
           | Iir_Kind_Selected_Element
           | Iir_Kind_Indexed_Name
           | Iir_Kind_Slice_Name
           | Iir_Kind_Subtype_Declaration
           | Iir_Kind_Type_Declaration
           | Iir_Kind_Implicit_Dereference
           | Iir_Kind_Function_Call
           | Iir_Kind_Attribute_Value
           | Iir_Kind_Attribute_Name
           | Iir_Kind_Subtype_Attribute =>
            Prefix_Type := Get_Type (Prefix);
         when Iir_Kinds_Subtype_Definition =>
            Prefix_Type := Prefix;
         when Iir_Kinds_Denoting_Name =>
            Prefix_Type := Get_Type (Prefix);
         when others =>
            Error_Kind ("eval_array_attribute", Prefix);
      end case;
      if Get_Kind (Prefix_Type) /= Iir_Kind_Array_Subtype_Definition then
         Error_Kind ("eval_array_attribute(2)", Prefix_Type);
      end if;

      Dim := Eval_Attribute_Parameter_Or_1 (Attr);
      return Get_Nth_Element (Get_Index_Subtype_List (Prefix_Type), Dim - 1);
   end Eval_Array_Attribute;

   function Eval_Integer_Image (Val : Iir_Int64; Orig : Iir) return Iir
   is
      use Str_Table;
      Img : String (1 .. 24); --  23 is enough, 24 is rounded.
      L : Natural;
      V : Iir_Int64;
      Id : String8_Id;
   begin
      V := Val;
      L := Img'Last;
      loop
         Img (L) := Character'Val (Character'Pos ('0') + abs (V rem 10));
         V := V / 10;
         L := L - 1;
         exit when V = 0;
      end loop;
      if Val < 0 then
         Img (L) := '-';
         L := L - 1;
      end if;
      Id := Create_String8;
      for I in L + 1 .. Img'Last loop
         Append_String8_Char (Img (I));
      end loop;
      return Build_String (Id, Nat32 (Img'Last - L), Orig);
   end Eval_Integer_Image;

   function Eval_Floating_Image (Val : Iir_Fp64; Orig : Iir) return Iir
   is
      use Str_Table;
      Id : String8_Id;

      --  Sign (1) + digit (1) + dot (1) + digits (15) + 'e' (1) + sign (1)
      --  + exp_digits (4) -> 24.
      Str : String (1 .. 25);
      P : Natural;

      Res : Iir;
   begin
      P := Str'First;

      Grt.Fcvt.Format_Image (Str, P, Interfaces.IEEE_Float_64 (Val));

      Id := Create_String8;
      for I in 1 .. P loop
         Append_String8_Char (Str (I));
      end loop;
      Res := Build_String (Id, Int32 (P), Orig);
      --  FIXME: this is not correct since the type is *not* constrained.
      Set_Type (Res, Create_Unidim_Array_By_Length
                (Get_Type (Orig), Iir_Int64 (P), Orig));
      return Res;
   end Eval_Floating_Image;

   function Eval_Enumeration_Image (Lit : Iir; Orig : Iir) return Iir
   is
      use Str_Table;
      Name : constant String := Image_Identifier (Lit);
      Image_Id : constant String8_Id := Str_Table.Create_String8;
   begin
      Append_String8_String (Name);
      return Build_String (Image_Id, Name'Length, Orig);
   end Eval_Enumeration_Image;

   function Build_Enumeration_Value (Val : String; Enum, Expr : Iir) return Iir
   is
      List  : constant Iir_Flist := Get_Enumeration_Literal_List (Enum);
      Value : String (Val'range);
      Id : Name_Id;
      Res : Iir;
   begin
      if Val'Length = 3
        and then Val (Val'First) = ''' and then Val (Val'Last) = '''
      then
         --  A single character.
         Id := Get_Identifier (Val (Val'First + 1));
      else
         for I in Val'range loop
            Value (I) := Ada.Characters.Handling.To_Lower (Val (I));
         end loop;
         Id := Get_Identifier (Value);
      end if;
      Res := Find_Name_In_Flist (List, Id);
      if Res /= Null_Iir then
         return Build_Constant (Res, Expr);
      else
         Warning_Msg_Sem (Warnid_Runtime_Error, +Expr,
                          "value %i not in enumeration %n", (+Id, +Enum));


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