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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUN-TIME COMPONENTS                         --
+--                                                                          --
+--                        S Y S T E M . E X P I N T                         --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--          Copyright (C) 1992-2009 Free Software Foundation, Inc.          --
+--                                                                          --
+-- GNAT is free software;  you can  redistribute it  and/or modify it under --
+-- terms of the  GNU General Public License as published  by the Free Soft- --
+-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
+-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
+--                                                                          --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception,   --
+-- version 3.1, as published by the Free Software Foundation.               --
+--                                                                          --
+-- You should have received a copy of the GNU General Public License and    --
+-- a copy of the GCC Runtime Library Exception along with this program;     --
+-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
+-- <http://www.gnu.org/licenses/>.                                          --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+package body System.Exp_Int is
+
+   -----------------
+   -- Exp_Integer --
+   -----------------
+
+   --  Note that negative exponents get a constraint error because the
+   --  subtype of the Right argument (the exponent) is Natural.
+
+   function Exp_Integer
+     (Left  : Integer;
+      Right : Natural)
+      return  Integer
+   is
+      Result : Integer := 1;
+      Factor : Integer := Left;
+      Exp    : Natural := Right;
+
+   begin
+      --  We use the standard logarithmic approach, Exp gets shifted right
+      --  testing successive low order bits and Factor is the value of the
+      --  base raised to the next power of 2.
+
+      --  Note: it is not worth special casing base values -1, 0, +1 since
+      --  the expander does this when the base is a literal, and other cases
+      --  will be extremely rare.
+
+      if Exp /= 0 then
+         loop
+            if Exp rem 2 /= 0 then
+               declare
+                  pragma Unsuppress (All_Checks);
+               begin
+                  Result := Result * Factor;
+               end;
+            end if;
+
+            Exp := Exp / 2;
+            exit when Exp = 0;
+
+            declare
+               pragma Unsuppress (All_Checks);
+            begin
+               Factor := Factor * Factor;
+            end;
+         end loop;
+      end if;
+
+      return Result;
+   end Exp_Integer;
+
+end System.Exp_Int;