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diff --git a/src/grt/grt-arith.ads b/src/grt/grt-arith.ads
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+--  GHDL Run Time (GRT) -  support for exp
+--  Copyright (C) 2022 Tristan Gingold
+--
+--  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, see <gnu.org/licenses>.
+--
+--  As a special exception, if other files instantiate generics from this
+--  unit, or you link this unit with other files to produce an executable,
+--  this unit does not by itself cause the resulting executable to be
+--  covered by the GNU General Public License. This exception does not
+--  however invalidate any other reasons why the executable file might be
+--  covered by the GNU Public License.
+with Grt.Types; use Grt.Types;
+with Grt.Vhdl_Types; use Grt.Vhdl_Types;
+
+package Grt.Arith is
+   --  Compute V**E.
+   --  Set OVF to true in case of overflow, or E < 0.
+   procedure Exp_I32 (V : Ghdl_I32;
+                      E : Std_Integer;
+                      Res : out Ghdl_I32;
+                      Ovf : out Boolean);
+
+   procedure Exp_I64 (V : Ghdl_I64;
+                      E : Std_Integer;
+                      Res : out Ghdl_I64;
+                      Ovf : out Boolean);
+end Grt.Arith;