From 62388e3fdbe4ade7628ed938c4f91a4f39654c4e Mon Sep 17 00:00:00 2001 From: Vincent Breitmoser Date: Sat, 22 Mar 2014 14:57:08 +0100 Subject: test: add junit+robolectric to buildfiles and stub test file --- .../keychain/PgpKeyOperationTest.java | 46 ++++++++++++++++++++++ .../keychain/RobolectricGradleTestRunner.java | 23 +++++++++++ 2 files changed, 69 insertions(+) create mode 100644 OpenPGP-Keychain/src/test/java/org/sufficientlysecure/keychain/PgpKeyOperationTest.java create mode 100644 OpenPGP-Keychain/src/test/java/org/sufficientlysecure/keychain/RobolectricGradleTestRunner.java (limited to 'OpenPGP-Keychain/src/test/java') diff --git a/OpenPGP-Keychain/src/test/java/org/sufficientlysecure/keychain/PgpKeyOperationTest.java b/OpenPGP-Keychain/src/test/java/org/sufficientlysecure/keychain/PgpKeyOperationTest.java new file mode 100644 index 000000000..72f29a1e3 --- /dev/null +++ b/OpenPGP-Keychain/src/test/java/org/sufficientlysecure/keychain/PgpKeyOperationTest.java @@ -0,0 +1,46 @@ +package org.sufficientlysecure.keychain; + +import org.junit.Before; +import org.junit.After; +import org.junit.Test; +import org.junit.runner.RunWith; +import org.robolectric.Robolectric; + +import org.sufficientlysecure.keychain.pgp.*; +import org.spongycastle.openpgp.*; + +@RunWith(RobolectricGradleTestRunner.class) +public class PgpKeyOperationTest { + + PGPSecretKey key; + + @Before + public void setUp() throws Exception { + + /* Input */ + int algorithm = Id.choice.algorithm.dsa; + String passphrase = "swag"; + int keysize = 2048; + boolean masterKey = true; + + /* Operation */ + PgpKeyOperation keyOperations = new PgpKeyOperation(null); + key = keyOperations.createKey(algorithm, keysize, passphrase, masterKey); + + System.err.println("initialized, test key: " + PgpKeyHelper.convertKeyIdToHex(key.getKeyID())); + } + + @After + public void tearDown() { + } + + @Test + public void createTest() { + } + + @Test + public void certifyKey() { + System.err.println("swag"); + } + +} diff --git a/OpenPGP-Keychain/src/test/java/org/sufficientlysecure/keychain/RobolectricGradleTestRunner.java b/OpenPGP-Keychain/src/test/java/org/sufficientlysecure/keychain/RobolectricGradleTestRunner.java new file mode 100644 index 000000000..b64ffde07 --- /dev/null +++ b/OpenPGP-Keychain/src/test/java/org/sufficientlysecure/keychain/RobolectricGradleTestRunner.java @@ -0,0 +1,23 @@ +package org.sufficientlysecure.keychain; + +import org.junit.runners.model.InitializationError; +import org.robolectric.AndroidManifest; +import org.robolectric.RobolectricTestRunner; +import org.robolectric.annotation.Config; +import org.robolectric.res.Fs; +import org.robolectric.res.FsFile; + +import org.sufficientlysecure.keychain.KeychainApplication; + +public class RobolectricGradleTestRunner extends RobolectricTestRunner { + public RobolectricGradleTestRunner(Class testClass) throws InitializationError { + super(testClass); + } + + @Override protected AndroidManifest getAppManifest(Config config) { + String myAppPath = KeychainApplication.class.getProtectionDomain().getCodeSource().getLocation().getPath(); + String manifestPath = myAppPath + "../../../src/main/AndroidManifest.xml"; + return createAppManifest(Fs.fileFromPath(manifestPath)); + } +} + -- cgit v1.2.3 n13' href='#n13'>13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 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--  Operations synthesis.
--  Copyright (C) 2019 Tristan Gingold
--
--  This file is part of GHDL.
--
--  This program is free software; you can redistribute it and/or modify
--  it under the terms of the GNU General Public License as published by
--  the Free Software Foundation; either version 2 of the License, or
--  (at your option) any later version.
--
--  This program is distributed in the hope that it will be useful,
--  but WITHOUT ANY WARRANTY; without even the implied warranty of
--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
--  GNU General Public License for more details.
--
--  You should have received a copy of the GNU General Public License
--  along with this program; if not, write to the Free Software
--  Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
--  MA 02110-1301, USA.

with Ada.Unchecked_Conversion;
with Types; use Types;
with Types_Utils; use Types_Utils;
with Mutils;

with Vhdl.Ieee.Std_Logic_1164; use Vhdl.Ieee.Std_Logic_1164;
with Vhdl.Std_Package;
with Vhdl.Errors; use Vhdl.Errors;
with Vhdl.Utils; use Vhdl.Utils;

with Areapools;

with Netlists; use Netlists;
with Netlists.Gates; use Netlists.Gates;
with Netlists.Builders; use Netlists.Builders;
with Netlists.Folds; use Netlists.Folds;

with Synth.Errors; use Synth.Errors;
with Synth.Stmts; use Synth.Stmts;
with Synth.Expr; use Synth.Expr;
with Synth.Source;
with Synth.Files_Operations;
with Synth.Static_Oper; use Synth.Static_Oper;

package body Synth.Oper is
   --  As log2(3m) is directly referenced, the program must be linked with -lm
   --  (math library) on unix systems.
   pragma Linker_Options ("-lm");

   procedure Set_Location (N : Net; Loc : Node)
     renames Synth.Source.Set_Location;

   function Synth_Uresize (N : Net; W : Width; Loc : Node) return Net is
   begin
      return Build2_Uresize (Build_Context, N, W, Get_Location (Loc));
   end Synth_Uresize;

   function Synth_Uresize (Val : Value_Acc; W : Width; Loc : Node) return Net
   is
      Res : Net;
   begin
      if Is_Static (Val) and then Val.Typ.Kind = Type_Discrete then
         if Val.Typ.Drange.Is_Signed and then Val.Scal < 0 then
            --  TODO.
            raise Internal_Error;
         else
            Res := Build2_Const_Uns (Build_Context, To_Uns64 (Val.Scal), W);
         end if;
         Set_Location (Res, Loc);
         return Res;
      end if;
      return Synth_Uresize (Get_Net (Val), W, Loc);
   end Synth_Uresize;

   function Synth_Sresize (Val : Value_Acc; W : Width; Loc : Node) return Net
   is
      Res : Net;
   begin
      if Is_Static (Val) and then Val.Typ.Kind = Type_Discrete then
         if Val.Typ.Drange.Is_Signed then
            Res := Build2_Const_Int (Build_Context, Val.Scal, W);
         else
            --  TODO.
            raise Internal_Error;
         end if;
         Set_Location (Res, Loc);
         return Res;
      end if;
      return Build2_Sresize (Build_Context, Get_Net (Val), W,
                             Get_Location (Loc));
   end Synth_Sresize;

   function Synth_Bit_Eq_Const (Cst : Value_Acc; Expr : Value_Acc; Loc : Node)
                               return Value_Acc
   is
      Val : Uns32;
      Zx : Uns32;
      N : Net;
   begin
      if Is_Static (Expr) then
         return Create_Value_Discrete (Boolean'Pos (Cst.Scal = Expr.Scal),
                                       Boolean_Type);
      end if;

      To_Logic (Cst.Scal, Cst.Typ, Val, Zx);
      if Zx /= 0 then
         --  Equal unknown -> return X
         N := Build_Const_UL32 (Build_Context, 0, 1, 1);
         Set_Location (N, Loc);
         return Create_Value_Net (N, Boolean_Type);
      elsif Val = 1 then
         --  The result type is a boolean; convert if needed.
         if Expr.Typ.Kind = Type_Logic then
            return Create_Value_Net (Get_Net (Expr), Boolean_Type);
         else
            pragma Assert (Expr.Typ.Kind = Type_Bit);
            return Expr;
         end if;
      else
         pragma Assert (Val = 0);
         N := Build_Monadic (Build_Context, Id_Not, Get_Net (Expr));
         Set_Location (N, Loc);
         return Create_Value_Net (N, Boolean_Type);
      end if;
   end Synth_Bit_Eq_Const;

   --  Create the result range of an operator.  According to the ieee standard,
   --  the range is LEN-1 downto 0.
   function Create_Res_Bound (Prev : Value_Acc) return Type_Acc
   is
      Res : Type_Acc;
   begin
      Res := Prev.Typ;

      if Res.Vbound.Dir = Iir_Downto
        and then Res.Vbound.Right = 0
      then
         --  Normalized range
         return Res;
      end if;

      return Create_Vec_Type_By_Length (Res.W, Res.Vec_El);
   end Create_Res_Bound;

   function Create_Bounds_From_Length
     (Syn_Inst : Synth_Instance_Acc; Atype : Iir; Len : Iir_Index32)
     return Bound_Type
   is
      Res : Bound_Type;
      Index_Bounds : Discrete_Range_Type;
      W : Width;
   begin
      Synth_Discrete_Range (Syn_Inst, Atype, Index_Bounds, W);

      Res := (Left => Int32 (Index_Bounds.Left),
              Right => 0,
              Dir => Index_Bounds.Dir,
              Wbounds => W,
              Len => Uns32 (Len));

      if Len = 0 then
         --  Special case.
         Res.Right := Res.Left;
         case Index_Bounds.Dir is
            when Iir_To =>
               Res.Left := Res.Right + 1;
            when Iir_Downto =>
               Res.Left := Res.Right - 1;
         end case;
      else
         case Index_Bounds.Dir is
            when Iir_To =>
               Res.Right := Res.Left + Int32 (Len - 1);
            when Iir_Downto =>
               Res.Right := Res.Left - Int32 (Len - 1);
         end case;
      end if;
      return Res;
   end Create_Bounds_From_Length;

   function Synth_Dyadic_Operation (Syn_Inst : Synth_Instance_Acc;
                                    Imp : Node;
                                    Left_Expr : Node;
                                    Right_Expr : Node;
                                    Expr : Node) return Value_Acc
   is
      Ctxt : constant Context_Acc := Get_Build (Syn_Inst);
      Def : constant Iir_Predefined_Functions :=
        Get_Implicit_Definition (Imp);
      Inter_Chain : constant Node :=
        Get_Interface_Declaration_Chain (Imp);
      Expr_Type : constant Node := Get_Type (Expr);
      Left_Type : constant Node := Get_Type (Inter_Chain);
      Right_Type : constant Node := Get_Type (Get_Chain (Inter_Chain));
      Left_Typ : constant Type_Acc := Get_Value_Type (Syn_Inst, Left_Type);
      Right_Typ : constant Type_Acc := Get_Value_Type (Syn_Inst, Right_Type);
      Left : Value_Acc;
      Right : Value_Acc;

      function Synth_Bit_Dyadic (Id : Dyadic_Module_Id) return Value_Acc
      is
         N : Net;
      begin
         N := Build_Dyadic (Build_Context, Id,
                            Get_Net (Left), Get_Net (Right));
         Set_Location (N, Expr);
         return Create_Value_Net (N, Left.Typ);
      end Synth_Bit_Dyadic;

      function Synth_Compare (Id : Compare_Module_Id) return Value_Acc
      is
         N : Net;
      begin
         pragma Assert (Left_Type = Right_Type);
         N := Build_Compare
           (Build_Context, Id, Get_Net (Left), Get_Net (Right));
         Set_Location (N, Expr);
         return Create_Value_Net (N, Boolean_Type);
      end Synth_Compare;

      function Synth_Compare_Array (Id, Id_Eq : Compare_Module_Id)
                                   return Value_Acc
      is
         pragma Unreferenced (Id_Eq);
         N : Net;
      begin
         if Left.Typ.Kind = Type_Vector then
            Warning_Msg_Synth
              (+Expr, "comparing non-numeric vector is unexpected");
            if Left.Typ.W = Right.Typ.W then
               N := Build_Compare
                 (Get_Build (Syn_Inst), Id, Get_Net (Left), Get_Net (Right));
               Set_Location (N, Expr);
               return Create_Value_Net (N, Boolean_Type);
            elsif Left.Typ.W < Right.Typ.W then
               --  TODO: truncate right, compare using id_eq.
               raise Internal_Error;
            else
               --  TODO: truncate left, compare using id.
               raise Internal_Error;
            end if;
         else
            raise Internal_Error;
         end if;
      end Synth_Compare_Array;

      function Synth_Compare_Uns_Nat (Id : Compare_Module_Id)
                                     return Value_Acc
      is
         N : Net;
      begin
         N := Synth_Uresize (Right, Left.Typ.W, Expr);
         N := Build_Compare (Build_Context, Id, Get_Net (Left), N);
         Set_Location (N, Expr);
         return Create_Value_Net (N, Boolean_Type);
      end Synth_Compare_Uns_Nat;

      function Synth_Compare_Sgn_Int (Id : Compare_Module_Id)
                                     return Value_Acc
      is
         N : Net;
      begin
         N := Synth_Sresize (Right, Left.Typ.W, Expr);
         N := Build_Compare (Build_Context, Id, Get_Net (Left), N);
         Set_Location (N, Expr);
         return Create_Value_Net (N, Boolean_Type);
      end Synth_Compare_Sgn_Int;

      function Synth_Vec_Dyadic (Id : Dyadic_Module_Id) return Value_Acc
      is
         N : Net;
      begin
         --  FIXME: check same length.
         N := Build_Dyadic (Build_Context, Id,
                            Get_Net (Left), Get_Net (Right));
         Set_Location (N, Expr);
         return Create_Value_Net (N, Create_Res_Bound (Left));
      end Synth_Vec_Dyadic;

      function Synth_Int_Dyadic (Id : Dyadic_Module_Id) return Value_Acc
      is
         Etype : constant Type_Acc := Get_Value_Type (Syn_Inst, Expr_Type);
         N : Net;
      begin
         N := Build_Dyadic
           (Build_Context, Id, Get_Net (Left), Get_Net (Right));
         Set_Location (N, Expr);
         return Create_Value_Net (N, Etype);
      end Synth_Int_Dyadic;

      function Synth_Dyadic_Uns (Id : Dyadic_Module_Id; Is_Res_Vec : Boolean)
                                return Value_Acc
      is
         W : constant Width := Width'Max (Left.Typ.W, Right.Typ.W);
         Rtype : Type_Acc;
         L1, R1 : Net;
         N : Net;
      begin
         if Is_Res_Vec then
            Rtype := Create_Vec_Type_By_Length (W, Left.Typ.Vec_El);
         else
            Rtype := Left.Typ;
         end if;
         L1 := Synth_Uresize (Left, W, Expr);
         R1 := Synth_Uresize (Right, W, Expr);
         N := Build_Dyadic (Build_Context, Id, L1, R1);
         Set_Location (N, Expr);
         return Create_Value_Net (N, Rtype);
      end Synth_Dyadic_Uns;

      function Synth_Dyadic_Sgn (Id : Dyadic_Module_Id; Is_Res_Vec : Boolean)
                                return Value_Acc
      is
         W : constant Width := Width'Max (Left.Typ.W, Right.Typ.W);
         Rtype : Type_Acc;
         L1, R1 : Net;
         N : Net;
      begin
         if Is_Res_Vec then
            Rtype := Create_Vec_Type_By_Length (W, Left.Typ.Vec_El);
         else
            Rtype := Left.Typ;
         end if;
         L1 := Synth_Sresize (Left, W, Expr);
         R1 := Synth_Sresize (Right, W, Expr);
         N := Build_Dyadic (Build_Context, Id, L1, R1);
         Set_Location (N, Expr);
         return Create_Value_Net (N, Rtype);
      end Synth_Dyadic_Sgn;

      function Synth_Compare_Uns_Uns (Id : Compare_Module_Id)
                                     return Value_Acc
      is
         W : constant Width := Width'Max (Left.Typ.W, Right.Typ.W);
         L1, R1 : Net;
         N : Net;
      begin
         L1 := Synth_Uresize (Left, W, Expr);
         R1 := Synth_Uresize (Right, W, Expr);
         N := Build_Compare (Build_Context, Id, L1, R1);
         Set_Location (N, Expr);
         return Create_Value_Net (N, Boolean_Type);
      end Synth_Compare_Uns_Uns;

      function Synth_Dyadic_Uns_Nat (Id : Dyadic_Module_Id) return Value_Acc
      is
         L : constant Net := Get_Net (Left);
         R1 : Net;
         N : Net;
      begin
         R1 := Synth_Uresize (Right, Left.Typ.W, Expr);
         N := Build_Dyadic (Build_Context, Id, L, R1);
         Set_Location (N, Expr);
         return Create_Value_Net (N, Create_Res_Bound (Left));
      end Synth_Dyadic_Uns_Nat;

      function Synth_Dyadic_Sgn_Int (Id : Dyadic_Module_Id) return Value_Acc
      is
         L : constant Net := Get_Net (Left);
         R1 : Net;
         N : Net;
      begin
         R1 := Synth_Sresize (Right, Left.Typ.W, Expr);
         N := Build_Dyadic (Build_Context, Id, L, R1);
         Set_Location (N, Expr);
         return Create_Value_Net (N, Create_Res_Bound (Left));
      end Synth_Dyadic_Sgn_Int;

      function Synth_Compare_Sgn_Sgn (Id : Compare_Module_Id)
                                     return Value_Acc
      is
         W : constant Width := Width'Max (Left.Typ.W, Right.Typ.W);
         L1, R1 : Net;
         N : Net;
      begin
         L1 := Synth_Sresize (Left, W, Expr);
         R1 := Synth_Sresize (Right, W, Expr);
         N := Build_Compare (Build_Context, Id, L1, R1);
         Set_Location (N, Expr);
         return Create_Value_Net (N, Boolean_Type);
      end Synth_Compare_Sgn_Sgn;
   begin
      Left := Synth_Expression_With_Type (Syn_Inst, Left_Expr, Left_Typ);
      Left := Synth_Subtype_Conversion (Left, Left_Typ, False, Expr);
      Strip_Const (Left);
      Right := Synth_Expression_With_Type (Syn_Inst, Right_Expr, Right_Typ);
      Right := Synth_Subtype_Conversion (Right, Right_Typ, False, Expr);
      Strip_Const (Right);

      if Is_Static_Val (Left) and Is_Static_Val (Right) then
         return Synth_Static_Dyadic_Predefined
           (Syn_Inst, Imp, Left, Right, Expr);
      end if;

      case Def is
         when Iir_Predefined_Error =>
            return null;

         when Iir_Predefined_Bit_And
           | Iir_Predefined_Boolean_And
           | Iir_Predefined_Ieee_1164_Scalar_And =>
            return Synth_Bit_Dyadic (Id_And);
         when Iir_Predefined_Bit_Xor
           | Iir_Predefined_Ieee_1164_Scalar_Xor =>
            return Synth_Bit_Dyadic (Id_Xor);
         when Iir_Predefined_Bit_Or
           | Iir_Predefined_Boolean_Or
           | Iir_Predefined_Ieee_1164_Scalar_Or =>
            return Synth_Bit_Dyadic (Id_Or);
         when Iir_Predefined_Bit_Nor
           | Iir_Predefined_Ieee_1164_Scalar_Nor =>
            return Synth_Bit_Dyadic (Id_Nor);
         when Iir_Predefined_Bit_Nand
           | Iir_Predefined_Boolean_Nand
           | Iir_Predefined_Ieee_1164_Scalar_Nand =>
            return Synth_Bit_Dyadic (Id_Nand);
         when Iir_Predefined_Bit_Xnor
           | Iir_Predefined_Ieee_1164_Scalar_Xnor =>
            return Synth_Bit_Dyadic (Id_Xnor);

         when Iir_Predefined_Ieee_1164_Vector_And
            | Iir_Predefined_Ieee_Numeric_Std_And_Uns_Uns
            | Iir_Predefined_Ieee_Numeric_Std_And_Sgn_Sgn =>
            return Synth_Vec_Dyadic (Id_And);
         when Iir_Predefined_Ieee_1164_Vector_Or
            | Iir_Predefined_Ieee_Numeric_Std_Or_Uns_Uns
            | Iir_Predefined_Ieee_Numeric_Std_Or_Sgn_Sgn =>
            return Synth_Vec_Dyadic (Id_Or);
         when Iir_Predefined_Ieee_1164_Vector_Nand
            | Iir_Predefined_Ieee_Numeric_Std_Nand_Uns_Uns
            | Iir_Predefined_Ieee_Numeric_Std_Nand_Sgn_Sgn =>
            return Synth_Vec_Dyadic (Id_Nand);
         when Iir_Predefined_Ieee_1164_Vector_Nor
            | Iir_Predefined_Ieee_Numeric_Std_Nor_Uns_Uns
            | Iir_Predefined_Ieee_Numeric_Std_Nor_Sgn_Sgn =>
            return Synth_Vec_Dyadic (Id_Nor);
         when Iir_Predefined_TF_Array_Xor
           | Iir_Predefined_Ieee_1164_Vector_Xor
           | Iir_Predefined_Ieee_Numeric_Std_Xor_Uns_Uns
           | Iir_Predefined_Ieee_Numeric_Std_Xor_Sgn_Sgn =>
            return Synth_Vec_Dyadic (Id_Xor);
         when Iir_Predefined_Ieee_1164_Vector_Xnor
            | Iir_Predefined_Ieee_Numeric_Std_Xnor_Uns_Uns
            | Iir_Predefined_Ieee_Numeric_Std_Xnor_Sgn_Sgn =>
            return Synth_Vec_Dyadic (Id_Xnor);

         when Iir_Predefined_Enum_Equality =>
            if Left_Typ = Bit_Type
              or else Left_Typ = Logic_Type
            then
               if Is_Static (Left) then
                  return Synth_Bit_Eq_Const (Left, Right, Expr);
               elsif Is_Static (Right) then
                  return Synth_Bit_Eq_Const (Right, Left, Expr);
               end if;
            end if;
            return Synth_Compare (Id_Eq);
         when Iir_Predefined_Enum_Inequality =>
            --  TODO: Optimize ?
            return Synth_Compare (Id_Ne);
         when Iir_Predefined_Enum_Less_Equal =>
            return Synth_Compare (Id_Ult);

         when Iir_Predefined_Array_Equality
            | Iir_Predefined_Record_Equality =>
            if not Is_Matching_Bounds (Left.Typ, Right.Typ) then
               Warning_Msg_Synth
                 (+Expr,
                  "length of '=' operands doesn't match, result is false");
               return Create_Value_Discrete (0, Boolean_Type);
            end if;
            return Synth_Compare (Id_Eq);
         when Iir_Predefined_Array_Inequality
            | Iir_Predefined_Record_Inequality =>
            if not Is_Matching_Bounds (Left.Typ, Right.Typ) then
               Warning_Msg_Synth
                 (+Expr,
                  "length of '/=' operands doesn't match, result is true");
               return Create_Value_Discrete (1, Boolean_Type);
            end if;
            return Synth_Compare (Id_Ne);
         when Iir_Predefined_Array_Greater =>
            return Synth_Compare_Array (Id_Ugt, Id_Uge);
         when Iir_Predefined_Array_Less =>
            return Synth_Compare_Array (Id_Ult, Id_Ule);

         when Iir_Predefined_Ieee_Numeric_Std_Add_Uns_Nat
           | Iir_Predefined_Ieee_Std_Logic_Unsigned_Add_Slv_Int =>
            --  "+" (Unsigned, Natural)
            return Synth_Dyadic_Uns_Nat (Id_Add);
         when Iir_Predefined_Ieee_Numeric_Std_Add_Uns_Uns
           | Iir_Predefined_Ieee_Numeric_Std_Add_Uns_Log
           | Iir_Predefined_Ieee_Std_Logic_Unsigned_Add_Slv_Sl
           | Iir_Predefined_Ieee_Std_Logic_Unsigned_Add_Slv_Slv =>
            --  "+" (Unsigned, Unsigned)
            return Synth_Dyadic_Uns (Id_Add, True);
         when Iir_Predefined_Ieee_Numeric_Std_Add_Sgn_Int =>
            --  "+" (Signed, Integer)
            return Synth_Dyadic_Sgn_Int (Id_Add);
         when Iir_Predefined_Ieee_Numeric_Std_Add_Sgn_Sgn =>
            --  "+" (Signed, Signed)
            return Synth_Dyadic_Sgn (Id_Add, True);

         when Iir_Predefined_Ieee_Numeric_Std_Sub_Uns_Nat
           | Iir_Predefined_Ieee_Std_Logic_Unsigned_Sub_Slv_Int =>
            --  "-" (Unsigned, Natural)
            return Synth_Dyadic_Uns_Nat (Id_Sub);
         when Iir_Predefined_Ieee_Numeric_Std_Sub_Uns_Uns
           | Iir_Predefined_Ieee_Std_Logic_Unsigned_Sub_Slv_Slv
           | Iir_Predefined_Ieee_Std_Logic_Unsigned_Sub_Slv_Sl =>
            --  "-" (Unsigned, Unsigned)
            return Synth_Dyadic_Uns (Id_Sub, True);
         when Iir_Predefined_Ieee_Numeric_Std_Sub_Sgn_Int
           | Iir_Predefined_Ieee_Std_Logic_Signed_Sub_Slv_Int =>
            --  "-" (Signed, Integer)
            return Synth_Dyadic_Sgn_Int (Id_Sub);
         when Iir_Predefined_Ieee_Numeric_Std_Sub_Sgn_Sgn =>
            --  "-" (Signed, Signed)
            return Synth_Dyadic_Sgn (Id_Sub, True);

         when Iir_Predefined_Ieee_Numeric_Std_Mul_Sgn_Sgn =>
            declare
               W : constant Width := Left.Typ.W + Right.Typ.W;
               L, R : Net;
               N : Net;
            begin
               L := Synth_Sresize (Left, W, Left_Expr);
               R := Synth_Sresize (Right, W, Right_Expr);
               N := Build_Dyadic (Build_Context, Id_Smul, L, R);
               Set_Location (N, Expr);
               return Create_Value_Net
                 (N, Create_Vec_Type_By_Length (W, Left.Typ.Vec_El));
            end;
         when Iir_Predefined_Ieee_Numeric_Std_Mul_Uns_Uns =>
            declare
               W : constant Width := Left.Typ.W + Right.Typ.W;
               L, R : Net;
               N : Net;
            begin
               L := Synth_Uresize (Left, W, Left_Expr);
               R := Synth_Uresize (Right, W, Right_Expr);
               N := Build_Dyadic (Build_Context, Id_Umul, L, R);
               Set_Location (N, Expr);
               return Create_Value_Net
                 (N, Create_Vec_Type_By_Length (W, Left.Typ.Vec_El));
            end;
         when Iir_Predefined_Ieee_Numeric_Std_Mul_Uns_Nat =>
            declare
               Lw : constant Width := Left.Typ.W;
               W : constant Width := 2 * Lw;
               L1, R1 : Net;
               Rtype : Type_Acc;
               N : Net;
            begin
               L1 := Synth_Uresize (Left, W, Expr);
               R1 := Synth_Uresize (Right, W, Expr);
               Rtype := Create_Vec_Type_By_Length (W, Left.Typ.Vec_El);
               N := Build_Dyadic (Build_Context, Id_Umul, L1, R1);
               Set_Location (N, Expr);
               return Create_Value_Net (N, Rtype);
            end;

         when Iir_Predefined_Ieee_Numeric_Std_Div_Uns_Nat =>
            declare
               Lw : constant Width := Left.Typ.W;
               W : constant Width := Width'Max (Lw, Right.Typ.W);
               L1, R1 : Net;
               Rtype : Type_Acc;
               N : Net;
            begin
               L1 := Synth_Uresize (Left, W, Expr);
               R1 := Synth_Uresize (Right, W, Expr);
               Rtype := Create_Vec_Type_By_Length (Lw, Left.Typ.Vec_El);
               N := Build_Dyadic (Build_Context, Id_Udiv, L1, R1);
               Set_Location (N, Expr);
               N := Synth_Uresize (N, Lw, Expr);
               return Create_Value_Net (N, Rtype);
            end;

         when Iir_Predefined_Ieee_Numeric_Std_Eq_Uns_Nat =>
            --  "=" (Unsigned, Natural)
            return Synth_Compare_Uns_Nat (Id_Eq);
         when Iir_Predefined_Ieee_Numeric_Std_Eq_Uns_Uns
           | Iir_Predefined_Ieee_Std_Logic_Unsigned_Eq_Slv_Slv =>
            --  "=" (Unsigned, Unsigned) [resize]
            return Synth_Compare_Uns_Uns (Id_Eq);
         when Iir_Predefined_Ieee_Numeric_Std_Eq_Sgn_Int =>
            --  "=" (Signed, Integer)
            return Synth_Compare_Sgn_Int (Id_Eq);
         when Iir_Predefined_Ieee_Numeric_Std_Eq_Sgn_Sgn =>
            --  "=" (Signed, Signed) [resize]
            return Synth_Compare_Sgn_Sgn (Id_Eq);

         when Iir_Predefined_Ieee_Numeric_Std_Ne_Uns_Uns
           | Iir_Predefined_Ieee_Std_Logic_Unsigned_Ne_Slv_Slv =>
            --  "/=" (Unsigned, Unsigned) [resize]
            return Synth_Compare_Uns_Uns (Id_Ne);
         when Iir_Predefined_Ieee_Numeric_Std_Ne_Uns_Nat =>
            --  "/=" (Unsigned, Natural)
            return Synth_Compare_Uns_Nat (Id_Ne);

         when Iir_Predefined_Ieee_Numeric_Std_Lt_Uns_Nat =>
            --  "<" (Unsigned, Natural)
            if Is_Static (Right) and then Right.Scal = 0 then
               --  Always false.
               return Create_Value_Discrete (0, Boolean_Type);
            end if;
            return Synth_Compare_Uns_Nat (Id_Ult);
         when Iir_Predefined_Ieee_Numeric_Std_Lt_Uns_Uns
           | Iir_Predefined_Ieee_Std_Logic_Unsigned_Lt_Slv_Slv =>
            --  "<" (Unsigned, Unsigned) [resize]
            return Synth_Compare_Uns_Uns (Id_Ult);
         when Iir_Predefined_Ieee_Numeric_Std_Lt_Sgn_Sgn =>
            --  "<" (Signed, Signed) [resize]
            return Synth_Compare_Sgn_Sgn (Id_Slt);

         when Iir_Predefined_Ieee_Numeric_Std_Le_Uns_Uns
           | Iir_Predefined_Ieee_Std_Logic_Unsigned_Le_Slv_Slv =>
            --  "<=" (Unsigned, Unsigned) [resize]
            return Synth_Compare_Uns_Uns (Id_Ule);
         when Iir_Predefined_Ieee_Numeric_Std_Le_Uns_Nat =>
            --  "<=" (Unsigned, Natural)
            return Synth_Compare_Uns_Nat (Id_Ule);

         when Iir_Predefined_Ieee_Numeric_Std_Gt_Uns_Nat =>
            --  ">" (Unsigned, Natural)
            return Synth_Compare_Uns_Nat (Id_Ugt);
         when Iir_Predefined_Ieee_Numeric_Std_Gt_Uns_Uns
           | Iir_Predefined_Ieee_Std_Logic_Unsigned_Gt_Slv_Slv =>
            --  ">" (Unsigned, Unsigned) [resize]
            return Synth_Compare_Uns_Uns (Id_Ugt);
         when Iir_Predefined_Ieee_Numeric_Std_Gt_Sgn_Sgn =>
            --  ">" (Signed, Signed) [resize]
            return Synth_Compare_Sgn_Sgn (Id_Sgt);

         when Iir_Predefined_Ieee_Numeric_Std_Ge_Uns_Uns
           | Iir_Predefined_Ieee_Std_Logic_Unsigned_Ge_Slv_Slv =>
            --  ">=" (Unsigned, Unsigned) [resize]
            return Synth_Compare_Uns_Uns (Id_Uge);
         when Iir_Predefined_Ieee_Numeric_Std_Ge_Uns_Nat =>
            --  ">=" (Unsigned, Natural)
            return Synth_Compare_Uns_Nat (Id_Uge);

         when Iir_Predefined_Array_Element_Concat =>
            declare
               L : constant Net := Get_Net (Left);
               Bnd : Bound_Type;
               N : Net;
            begin
               N := Build_Concat2 (Build_Context, L, Get_Net (Right));
               Set_Location (N, Expr);
               Bnd := Create_Bounds_From_Length
                 (Syn_Inst,
                  Get_Index_Type (Get_Type (Expr), 0),
                  Iir_Index32 (Get_Width (L) + 1));

               return Create_Value_Net
                 (N, Create_Onedimensional_Array_Subtype (Left_Typ, Bnd));
            end;
         when Iir_Predefined_Element_Array_Concat =>
            declare
               R : constant Net := Get_Net (Right);
               Bnd : Bound_Type;
               N : Net;
            begin
               N := Build_Concat2 (Build_Context, Get_Net (Left), R);
               Set_Location (N, Expr);
               Bnd := Create_Bounds_From_Length
                 (Syn_Inst,
                  Get_Index_Type (Get_Type (Expr), 0),
                  Iir_Index32 (Get_Width (R) + 1));

               return Create_Value_Net
                 (N, Create_Onedimensional_Array_Subtype (Right_Typ, Bnd));
            end;
         when Iir_Predefined_Element_Element_Concat =>
            declare
               Ret_Typ : constant Type_Acc :=
                 Get_Value_Type (Syn_Inst, Get_Return_Type (Imp));
               N : Net;
               Bnd : Bound_Type;
            begin
               N := Build_Concat2
                 (Build_Context, Get_Net (Left), Get_Net (Right));
               Set_Location (N, Expr);
               Bnd := Create_Bounds_From_Length
                 (Syn_Inst, Get_Index_Type (Get_Type (Expr), 0), 2);
               return Create_Value_Net
                 (N, Create_Onedimensional_Array_Subtype (Ret_Typ, Bnd));
            end;
         when Iir_Predefined_Array_Array_Concat =>
            declare
               L : constant Net := Get_Net (Left);
               R : constant Net := Get_Net (Right);
               Bnd : Bound_Type;
               N : Net;
            begin
               N := Build_Concat2 (Build_Context, L, R);
               Set_Location (N, Expr);
               Bnd := Create_Bounds_From_Length
                 (Syn_Inst,
                  Get_Index_Type (Get_Type (Expr), 0),
                  Iir_Index32 (Get_Width (L) + Get_Width (R)));

               return Create_Value_Net
                 (N, Create_Vector_Type (Bnd, Get_Array_Element (Left.Typ)));
            end;
         when Iir_Predefined_Integer_Plus =>
            return Synth_Int_Dyadic (Id_Add);
         when Iir_Predefined_Integer_Minus =>
            return Synth_Int_Dyadic (Id_Sub);
         when Iir_Predefined_Integer_Mul =>
            return Synth_Int_Dyadic (Id_Smul);
         when Iir_Predefined_Integer_Div =>
            return Synth_Int_Dyadic (Id_Sdiv);
         when Iir_Predefined_Integer_Mod =>
            if Is_Static_Val (Right) then
               --  Optimize when the divisor is a power of 2.
               declare
                  use Mutils;
                  Etype : constant Type_Acc :=
                    Get_Value_Type (Syn_Inst, Expr_Type);
                  R : constant Int64 := Get_Static_Discrete (Right);
                  Log_R : Natural;
                  N : Net;
               begin
                  if R > 0 and then Is_Power2 (Uns64 (R)) then
                     Log_R := Clog2 (Uns64 (R));
                     pragma Assert (Log_R <= Natural (Left.Typ.W));
                     N := Get_Net (Left);
                     N := Build2_Extract (Ctxt, N, 0, Width (Log_R));
                     N := Build2_Uresize (Ctxt, N, Left.Typ.W,
                                          Get_Location (Expr));
                     return Create_Value_Net (N, Etype);
                  end if;
               end;
            end if;
            return Synth_Int_Dyadic (Id_Smod);
         when Iir_Predefined_Integer_Rem =>
            return Synth_Int_Dyadic (Id_Srem);
         when Iir_Predefined_Integer_Exp =>
            Error_Msg_Synth
              (+Expr, "non-constant exponentiation not supported");
            return null;
         when Iir_Predefined_Integer_Less_Equal =>
            return Synth_Compare (Id_Sle);
         when Iir_Predefined_Integer_Less =>
            return Synth_Compare (Id_Slt);
         when Iir_Predefined_Integer_Greater_Equal =>
            return Synth_Compare (Id_Sge);
         when Iir_Predefined_Integer_Greater =>
            return Synth_Compare (Id_Sgt);
         when Iir_Predefined_Integer_Equality =>
            return Synth_Compare (Id_Eq);
         when Iir_Predefined_Integer_Inequality =>
            return Synth_Compare (Id_Ne);
         when Iir_Predefined_Physical_Physical_Div =>
            Error_Msg_Synth (+Expr, "non-constant division not supported");
            return null;

         when Iir_Predefined_Floating_Div =>
            Error_Msg_Synth (+Expr, "non-constant division not supported");
            return null;

         when others =>
            Error_Msg_Synth (+Expr, "synth_dyadic_operation: unhandled "
                               & Iir_Predefined_Functions'Image (Def));
            raise Internal_Error;
      end case;
   end Synth_Dyadic_Operation;

   function Synth_Monadic_Operation (Syn_Inst : Synth_Instance_Acc;
                                     Imp : Node;
                                     Operand_Expr : Node;
                                     Loc : Node) return Value_Acc
   is
      Def : constant Iir_Predefined_Functions :=
        Get_Implicit_Definition (Imp);
      Inter_Chain : constant Node :=
        Get_Interface_Declaration_Chain (Imp);
      Oper_Type : constant Node := Get_Type (Inter_Chain);
      Oper_Typ : constant Type_Acc := Get_Value_Type (Syn_Inst, Oper_Type);
      Operand : Value_Acc;

      function Synth_Bit_Monadic (Id : Monadic_Module_Id) return Value_Acc
      is
         N : Net;
      begin
         N := Build_Monadic (Build_Context, Id, Get_Net (Operand));
         Set_Location (N, Loc);
         return Create_Value_Net (N, Operand.Typ);
      end Synth_Bit_Monadic;

      function Synth_Vec_Monadic (Id : Monadic_Module_Id) return Value_Acc
      is
         Op: constant Net := Get_Net (Operand);
         N : Net;
      begin
         N := Build_Monadic (Build_Context, Id, Op);
         Set_Location (N, Loc);
         return Create_Value_Net (N, Create_Res_Bound (Operand));
      end Synth_Vec_Monadic;

      function Synth_Vec_Reduce_Monadic (Id : Reduce_Module_Id)
         return Value_Acc
      is
         Op: constant Net := Get_Net (Operand);
         N : Net;
      begin
         N := Build_Reduce (Build_Context, Id, Op);
         Set_Location (N, Loc);
         return Create_Value_Net (N, Operand.Typ.Vec_El);
      end Synth_Vec_Reduce_Monadic;
   begin
      Operand := Synth_Expression_With_Type (Syn_Inst, Operand_Expr, Oper_Typ);
      Operand := Synth_Subtype_Conversion (Operand, Oper_Typ, False, Loc);
      Strip_Const (Operand);

      if Is_Static_Val (Operand) then
         return Synth_Static_Monadic_Predefined
           (Syn_Inst, Imp, Operand, Loc);
      end if;

      case Def is
         when Iir_Predefined_Error =>
            return null;
         when Iir_Predefined_Ieee_1164_Scalar_Not =>
            return Synth_Bit_Monadic (Id_Not);
         when Iir_Predefined_Boolean_Not
           | Iir_Predefined_Bit_Not =>
            return Synth_Bit_Monadic (Id_Not);
         when Iir_Predefined_Ieee_1164_Vector_Not
            | Iir_Predefined_Ieee_Numeric_Std_Not_Uns
            | Iir_Predefined_Ieee_Numeric_Std_Not_Sgn =>
            return Synth_Vec_Monadic (Id_Not);
         when Iir_Predefined_Ieee_Numeric_Std_Neg_Uns
           | Iir_Predefined_Ieee_Numeric_Std_Neg_Sgn =>
            return Synth_Vec_Monadic (Id_Neg);
         when Iir_Predefined_Ieee_1164_Vector_And_Reduce =>
            return Synth_Vec_Reduce_Monadic(Id_Red_And);
         when Iir_Predefined_Ieee_1164_Vector_Or_Reduce =>
            return Synth_Vec_Reduce_Monadic(Id_Red_Or);
         when Iir_Predefined_Ieee_1164_Condition_Operator =>
            return Operand;
         when Iir_Predefined_Integer_Negation =>
            declare
               N : Net;
            begin
               N := Build_Monadic (Build_Context, Id_Neg, Get_Net (Operand));
               Set_Location (N, Loc);
               return Create_Value_Net (N, Operand.Typ);
            end;
         when others =>
            Error_Msg_Synth
              (+Loc,
               "unhandled monadic: " & Iir_Predefined_Functions'Image (Def));
            raise Internal_Error;
      end case;
   end Synth_Monadic_Operation;

   function Synth_Shift_Rotate (Id : Shift_Rotate_Module_Id;
                         Left, Right : Value_Acc;
                         Expr : Node) return Value_Acc
   is
      L : constant Net := Get_Net (Left);
      N : Net;
   begin
      N := Build_Shift_Rotate (Build_Context, Id, L, Get_Net (Right));
      Set_Location (N, Expr);
      return Create_Value_Net (N, Create_Res_Bound (Left));
   end Synth_Shift_Rotate;

   function Synth_Std_Match (Cst : Value_Acc;
                             Oper : Value_Acc;
                             Expr : Node) return Value_Acc
   is
      Wd : constant Width := Cst.Typ.W;
      Nwords : constant Natural := Natural ((Wd + 31) / 32);
      Mask : Uns32_Arr_Acc;
      Vals : Uns32_Arr_Acc;
      Boff : Natural;
      Woff : Natural;
      B : Uns32;
      M : Uns32;
      Nv : Net;
      Nm : Net;
      Res : Net;
   begin
      if Oper.Typ.W /= Wd then
         Error_Msg_Synth
           (+Expr, "operands of std_match don't have the same size");
         return Create_Value_Discrete (0, Boolean_Type);
      end if;

      pragma Assert (Wd > 0);

      --  Flatten 0/1 DC.
      Mask := new Uns32_Arr'(0 .. Nwords - 1 => 0);
      Vals := new Uns32_Arr'(0 .. Nwords - 1 => 0);

      Boff := 0;
      Woff := 0;
      for I in reverse Cst.Arr.V'Range loop
         case Cst.Arr.V (I).Scal is
            when Vhdl.Ieee.Std_Logic_1164.Std_Logic_0_Pos
              |  Vhdl.Ieee.Std_Logic_1164.Std_Logic_L_Pos =>
               B := 0;
               M := 1;
            when Vhdl.Ieee.Std_Logic_1164.Std_Logic_1_Pos
              |  Vhdl.Ieee.Std_Logic_1164.Std_Logic_H_Pos =>
               B := 1;
               M := 1;
            when Vhdl.Ieee.Std_Logic_1164.Std_Logic_U_Pos
              |  Vhdl.Ieee.Std_Logic_1164.Std_Logic_X_Pos
              |  Vhdl.Ieee.Std_Logic_1164.Std_Logic_Z_Pos
              |  Vhdl.Ieee.Std_Logic_1164.Std_Logic_W_Pos =>
               --  Never match
               --  FIXME: warning ?
               Unchecked_Deallocate (Mask);
               Unchecked_Deallocate (Vals);
               return Create_Value_Discrete (0, Boolean_Type);
            when Vhdl.Ieee.Std_Logic_1164.Std_Logic_D_Pos =>
               B := 0;
               M := 0;
            when others =>
               raise Internal_Error;
         end case;
         Mask (Woff) := Mask (Woff) or Shift_Left (M, Boff);
         Vals (Woff) := Vals (Woff) or Shift_Left (B, Boff);
         Boff := Boff + 1;
         if Boff = 32 then
            Boff := 0;
            Woff := Woff + 1;
         end if;
      end loop;

      --  Generate and + eq
      Nv := Build2_Const_Vec (Build_Context, Wd, Vals.all);
      Set_Location (Nv, Expr);
      Unchecked_Deallocate (Vals);
      Nm := Build2_Const_Vec (Build_Context, Wd, Mask.all);
      Set_Location (Nm, Expr);
      Unchecked_Deallocate (Mask);
      Res := Build_Dyadic (Build_Context, Id_And, Get_Net (Oper), Nm);
      Set_Location (Res, Expr);
      Res := Build_Compare (Build_Context, Id_Eq, Res, Nv);
      Set_Location (Res, Expr);

      return Create_Value_Net (Res, Boolean_Type);
   end Synth_Std_Match;

   function Eval_To_Unsigned (Arg : Int64; Sz : Int64; Res_Type : Type_Acc)
                             return Value_Acc
   is
      Len : constant Iir_Index32 := Iir_Index32 (Sz);
      El_Type : constant Type_Acc := Get_Array_Element (Res_Type);
      Arr : Value_Array_Acc;
      Bnd : Type_Acc;
   begin
      Arr := Create_Value_Array (Len);
      for I in 1 .. Len loop
         Arr.V (Len - I + 1) := Create_Value_Discrete
           (Std_Logic_0_Pos + (Arg / 2 ** Natural (I - 1)) mod 2, El_Type);
      end loop;
      Bnd := Create_Vec_Type_By_Length (Width (Len), El_Type);
      return Create_Value_Const_Array (Bnd, Arr);
   end Eval_To_Unsigned;

   function Synth_Predefined_Function_Call
     (Syn_Inst : Synth_Instance_Acc; Expr : Node) return Value_Acc
   is
      Imp  : constant Node := Get_Implementation (Expr);
      Def : constant Iir_Predefined_Functions :=
        Get_Implicit_Definition (Imp);
      Assoc_Chain : constant Node := Get_Parameter_Association_Chain (Expr);
      Inter_Chain : constant Node := Get_Interface_Declaration_Chain (Imp);
      Param1 : Node;
      Param2 : Node;
      Subprg_Inst : Synth_Instance_Acc;
      M : Areapools.Mark_Type;
   begin
      Areapools.Mark (M, Instance_Pool.all);
      Subprg_Inst := Make_Instance (Syn_Inst, Imp);

      Synth_Subprogram_Association
        (Subprg_Inst, Syn_Inst, Inter_Chain, Assoc_Chain);

      Param1 := Inter_Chain;
      if Param1 /= Null_Node then
         Param2 := Get_Chain (Inter_Chain);
      else
         Param2 := Null_Node;
      end if;

      case Def is
         when Iir_Predefined_Endfile =>
            declare
               L : constant Value_Acc := Get_Value (Subprg_Inst, Param1);
               Res : Boolean;
            begin
               Res := Synth.Files_Operations.Endfile (L.File, Expr);
               return Create_Value_Discrete (Boolean'Pos (Res), Boolean_Type);
            end;
         when Iir_Predefined_Ieee_1164_Rising_Edge =>
            declare
               Clk : Net;
               Edge : Net;
            begin
               Clk := Get_Net (Get_Value (Subprg_Inst, Param1));
               Edge := Build_Edge (Build_Context, Clk);
               return Create_Value_Net (Edge, Boolean_Type);
            end;
         when Iir_Predefined_Ieee_1164_Falling_Edge =>
            declare
               Clk : Net;
               Edge : Net;
            begin
               Clk := Get_Net (Get_Value (Subprg_Inst, Param1));
               Clk := Build_Monadic (Build_Context, Id_Not, Clk);
               Edge := Build_Edge (Build_Context, Clk);
               return Create_Value_Net (Edge, Boolean_Type);
            end;
         when Iir_Predefined_Ieee_1164_Scalar_Is_X
           | Iir_Predefined_Ieee_1164_Vector_Is_X =>
            --  Always false.
            return Create_Value_Discrete (0, Boolean_Type);
         when Iir_Predefined_Ieee_1164_To_Bitvector =>
            declare
               L : constant Value_Acc := Get_Value (Subprg_Inst, Param1);
               R : constant Value_Acc := Get_Value (Subprg_Inst, Param2);
               pragma Unreferenced (R);
            begin
               if Is_Static (L) then
                  raise Internal_Error;
               end if;
               return Create_Value_Net (Get_Net (L), Create_Res_Bound (L));
            end;
         when Iir_Predefined_Ieee_Numeric_Std_Touns_Nat_Nat_Uns
           | Iir_Predefined_Ieee_Std_Logic_Arith_Conv_Unsigned_Int =>
            declare
               Arg : constant Value_Acc := Get_Value (Subprg_Inst, Param1);
               Size : Value_Acc;
               Arg_Net : Net;
            begin
               Size := Get_Value (Subprg_Inst, Param2);
               if not Is_Static (Size) then
                  Error_Msg_Synth (+Expr, "to_unsigned size must be constant");
                  return Arg;
               else
                  Strip_Const (Size);
                  --  FIXME: what if the arg is constant too ?
                  if Is_Static (Arg) then
                     return Eval_To_Unsigned
                       (Arg.Scal, Size.Scal,
                        Get_Value_Type (Syn_Inst, Get_Type (Imp)));
                  else
                     Arg_Net := Get_Net (Arg);
                     return Create_Value_Net
                       (Synth_Uresize (Arg_Net, Uns32 (Size.Scal), Expr),
                        Create_Vec_Type_By_Length (Uns32 (Size.Scal),
                                                   Logic_Type));
                  end if;
               end if;
            end;
         when Iir_Predefined_Ieee_Numeric_Std_Toint_Uns_Nat
           | Iir_Predefined_Ieee_Std_Logic_Arith_Conv_Integer_Uns
           | Iir_Predefined_Ieee_Std_Logic_Unsigned_Conv_Integer =>
            --  UNSIGNED to Natural.
            declare
               Int_Type : constant Type_Acc :=
                 Get_Value_Type (Syn_Inst,
                                 Vhdl.Std_Package.Integer_Subtype_Definition);
            begin
               return Create_Value_Net
                 (Synth_Uresize (Get_Net (Get_Value (Subprg_Inst, Param1)),
                                 Int_Type.W, Expr),
                  Int_Type);
            end;
         when Iir_Predefined_Ieee_Numeric_Std_Resize_Uns_Nat =>
            declare
               V : constant Value_Acc := Get_Value (Subprg_Inst, Param1);
               Sz : constant Value_Acc := Get_Value (Subprg_Inst, Param2);
               W : Width;
            begin
               if not Is_Static (Sz) then
                  Error_Msg_Synth (+Expr, "size must be constant");
                  return null;
               end if;
               W := Uns32 (Sz.Scal);
               return Create_Value_Net
                 (Synth_Uresize (Get_Net (V), W, Expr),
                  Create_Vec_Type_By_Length (W, Logic_Type));
            end;
         when Iir_Predefined_Ieee_Numeric_Std_Resize_Sgn_Nat =>
            declare
               V : constant Value_Acc := Get_Value (Subprg_Inst, Param1);
               Sz : constant Value_Acc := Get_Value (Subprg_Inst, Param2);
               W : Width;
            begin
               if not Is_Static (Sz) then
                  Error_Msg_Synth (+Expr, "size must be constant");
                  return null;
               end if;
               W := Uns32 (Sz.Scal);
               return Create_Value_Net
                 (Build2_Sresize (Get_Build (Syn_Inst), Get_Net (V), W,
                                  Get_Location (Expr)),
                  Create_Vec_Type_By_Length (W, Logic_Type));
            end;
         when Iir_Predefined_Ieee_Numeric_Std_Shl_Uns_Nat
           | Iir_Predefined_Ieee_Numeric_Std_Shl_Sgn_Nat =>
            declare
               L : constant Value_Acc := Get_Value (Subprg_Inst, Param1);
               R : constant Value_Acc := Get_Value (Subprg_Inst, Param2);
            begin
               return Synth_Shift_Rotate (Id_Lsl, L, R, Expr);
            end;
         when Iir_Predefined_Ieee_Numeric_Std_Shr_Uns_Nat =>
            declare
               L : constant Value_Acc := Get_Value (Subprg_Inst, Param1);
               R : constant Value_Acc := Get_Value (Subprg_Inst, Param2);
            begin
               return Synth_Shift_Rotate (Id_Lsr, L, R, Expr);
            end;
         when Iir_Predefined_Ieee_Numeric_Std_Shr_Sgn_Nat =>
            declare
               L : constant Value_Acc := Get_Value (Subprg_Inst, Param1);
               R : constant Value_Acc := Get_Value (Subprg_Inst, Param2);
            begin
               return Synth_Shift_Rotate (Id_Asr, L, R, Expr);
            end;
         when Iir_Predefined_Ieee_Numeric_Std_Rol_Uns_Nat =>
            declare
               L : constant Value_Acc := Get_Value (Subprg_Inst, Param1);
               R : constant Value_Acc := Get_Value (Subprg_Inst, Param2);
            begin
               return Synth_Shift_Rotate (Id_Rol, L, R, Expr);
            end;
         when Iir_Predefined_Ieee_Numeric_Std_Ror_Uns_Nat =>
            declare
               L : constant Value_Acc := Get_Value (Subprg_Inst, Param1);
               R : constant Value_Acc := Get_Value (Subprg_Inst, Param2);
            begin
               return Synth_Shift_Rotate (Id_Ror, L, R, Expr);
            end;
         when Iir_Predefined_Ieee_Numeric_Std_Match_Suv =>
            declare
               L : constant Value_Acc := Get_Value (Subprg_Inst, Param1);
               R : constant Value_Acc := Get_Value (Subprg_Inst, Param2);
            begin
               if Is_Static (L) then
                  return Synth_Std_Match (L, R, Expr);
               elsif Is_Static (R) then
                  return Synth_Std_Match (R, L, Expr);
               else
                  Error_Msg_Synth
                    (+Expr, "one operand of std_match must be constant");
                  return null;
               end if;
            end;
         when Iir_Predefined_Ieee_Math_Real_Log2 =>
            declare
               V : constant Value_Acc := Get_Value (Subprg_Inst, Param1);

               function Log2 (Arg : Fp64) return Fp64;
               pragma Import (C, Log2);
            begin
               if V.Typ.Kind /= Type_Float then
                  Error_Msg_Synth (+Expr, "argument must be a float value");
                  return null;
               end if;
               return Create_Value_Float
                 (Log2 (V.Fp), Get_Value_Type (Syn_Inst, Get_Type (Imp)));
            end;
         when Iir_Predefined_Ieee_Math_Real_Ceil =>
            declare
               V : constant Value_Acc := Get_Value (Subprg_Inst, Param1);

               function Ceil (Arg : Fp64) return Fp64;
               pragma Import (C, Ceil);
            begin
               if V.Typ.Kind /= Type_Float then
                  Error_Msg_Synth(+Expr, "argument must be a float value");
                  return null;
               end if;
               return Create_Value_Float
                 (Ceil (V.Fp), Get_Value_Type (Syn_Inst, Get_Type (Imp)));
            end;
         when Iir_Predefined_Ieee_Math_Real_Round =>
            declare
               V : constant Value_Acc := Get_Value (Subprg_Inst, Param1);

               function Round (Arg : Fp64) return Fp64;
               pragma Import (C, Round);
            begin
               if V.Typ.Kind /= Type_Float then
                  Error_Msg_Synth(+Expr, "argument must be a float value");
                  return null;
               end if;
               return Create_Value_Float
                 (Round (V.Fp), Get_Value_Type (Syn_Inst, Get_Type (Imp)));
            end;
         when Iir_Predefined_Ieee_Math_Real_Sin =>
            declare
               V : constant Value_Acc := Get_Value (Subprg_Inst, Param1);

               function Sin (Arg : Fp64) return Fp64;
               pragma Import (C, Sin);
            begin
               if V.Typ.Kind /= Type_Float then
                  Error_Msg_Synth (+Expr, "argument must be a float value");
                  return null;
               end if;
               return Create_Value_Float
                 (Sin (V.Fp), Get_Value_Type (Syn_Inst, Get_Type (Imp)));
            end;
         when Iir_Predefined_Ieee_Math_Real_Cos =>
            declare
               V : constant Value_Acc := Get_Value (Subprg_Inst, Param1);

               function Cos (Arg : Fp64) return Fp64;
               pragma Import (C, Cos);
            begin
               if V.Typ.Kind /= Type_Float then
                  Error_Msg_Synth (+Expr, "argument must be a float value");
                  return null;
               end if;
               return Create_Value_Float
                 (Cos (V.Fp), Get_Value_Type (Syn_Inst, Get_Type (Imp)));
            end;
         when others =>
            Error_Msg_Synth
              (+Expr,
               "unhandled function: " & Iir_Predefined_Functions'Image (Def));
      end case;

      Free_Instance (Subprg_Inst);
      Areapools.Release (M, Instance_Pool.all);

      return null;
   end Synth_Predefined_Function_Call;
end Synth.Oper;