56 lines
3.0 KiB
Ada
56 lines
3.0 KiB
Ada
------------------------------------------------------------------------------
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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) 1996-2005 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 2, 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. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
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-- Boston, MA 02110-1301, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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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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