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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- S Y S T E M . M A N T I S S A --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1996-2009 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.Mantissa is
+
+ --------------------
+ -- Mantissa_Value --
+ --------------------
+
+ function Mantissa_Value (First, Last : Integer) return Natural is
+ Result : Natural := 0;
+
+ Val : Integer := Integer'Max (abs First - 1, abs Last);
+ -- Note: First-1 allows for twos complement largest neg number
+
+ begin
+ while Val /= 0 loop
+ Val := Val / 2;
+ Result := Result + 1;
+ end loop;
+
+ return Result;
+ end Mantissa_Value;
+
+end System.Mantissa;