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jeremybenn |
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- S Y S T E M . M A N T I S S A --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1996-2009 Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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package body System.Mantissa is
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--------------------
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-- Mantissa_Value --
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--------------------
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function Mantissa_Value (First, Last : Integer) return Natural is
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Result : Natural := 0;
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Val : Integer := Integer'Max (abs First - 1, abs Last);
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-- Note: First-1 allows for twos complement largest neg number
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begin
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while Val /= 0 loop
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Val := Val / 2;
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Result := Result + 1;
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end loop;
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return Result;
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end Mantissa_Value;
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end System.Mantissa;
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