3 files changed, 61 insertions, 14 deletions
diff --git a/src/synth/netlists-internings.adb b/src/synth/netlists-internings.adb
new file mode 100644
index 000000000..fb534e587
--- /dev/null
+++ b/src/synth/netlists-internings.adb
@@ -0,0 +1,26 @@
+--  Simple interning for netlist elements.
+--  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.
+
+package body Netlists.Internings is
+   function Id_Instance (Param : Instance) return Instance is
+   begin
+      return Param;
+   end Id_Instance;
+end Netlists.Internings;
diff --git a/src/synth/netlists-internings.ads b/src/synth/netlists-internings.ads
new file mode 100644
index 000000000..4fcc87d56
--- /dev/null
+++ b/src/synth/netlists-internings.ads
@@ -0,0 +1,32 @@
+--  Simple interning for netlist elements.
+--  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 Dyn_Interning;
+
+package Netlists.Internings is
+   function Id_Instance (Param : Instance) return Instance;
+
+   package Dyn_Instance_Interning is new Dyn_Interning
+     (Params_Type => Instance,
+      Object_Type => Instance,
+      Hash => Netlists.Hash,
+      Build => Id_Instance,
+      Equal => "=");
+end Netlists.Internings;
diff --git a/src/synth/synth-inference.adb b/src/synth/synth-inference.adb
index 643b2d124..ea976bd45 100644
--- a/src/synth/synth-inference.adb
+++ b/src/synth/synth-inference.adb
@@ -18,13 +18,12 @@
 --  Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
 --  MA 02110-1301, USA.
 
-with Dyn_Interning;
-
 with Netlists.Utils; use Netlists.Utils;
 with Netlists.Gates; use Netlists.Gates;
 with Netlists.Gates_Ports; use Netlists.Gates_Ports;
 with Netlists.Locations; use Netlists.Locations;
 with Netlists.Errors; use Netlists.Errors;
+with Netlists.Internings;
 
 with Synth.Flags;
 with Synth.Source; use Synth.Source;
@@ -404,18 +403,6 @@ package body Synth.Inference is
       Add_Conc_Assign (Wid, Res, Off, Stmt);
    end Infere_FF;
 
-   function Id_Instance (Param : Instance) return Instance is
-   begin
-      return Param;
-   end Id_Instance;
-
-   package Inst_Interning is new Dyn_Interning
-     (Params_Type => Instance,
-      Object_Type => Instance,
-      Hash => Netlists.Hash,
-      Build => Id_Instance,
-      Equal => "=");
-
    --  Detect false combinational loop.  They can easily appear when variables
    --  are only used in one branch:
    --    process (all)
@@ -437,6 +424,8 @@ package body Synth.Inference is
    --  muxes (which were inserted by controls).
    function Is_False_Loop (Prev_Val : Net) return Boolean
    is
+      package Inst_Interning renames
+        Netlists.Internings.Dyn_Instance_Interning;
       use Inst_Interning;
       T : Inst_Interning.Instance;