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+-- IMPDEFG.A
+--
+--                             Grant of Unlimited Rights
+--
+--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
+--     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained 
+--     unlimited rights in the software and documentation contained herein.
+--     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making 
+--     this public release, the Government intends to confer upon all 
+--     recipients unlimited rights  equal to those held by the Government.  
+--     These rights include rights to use, duplicate, release or disclose the 
+--     released technical data and computer software in whole or in part, in 
+--     any manner and for any purpose whatsoever, and to have or permit others 
+--     to do so.
+--
+--                                    DISCLAIMER
+--
+--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
+--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED 
+--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
+--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE 
+--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
+--     PARTICULAR PURPOSE OF SAID MATERIAL.
+--*
+--
+-- DESCRIPTION:
+--     This package provides tailorable entities for a particular
+--     implementation.  Each entity may be modified to suit the needs
+--     of the implementation.  Default values are provided to act as
+--     a guide.
+--
+--     The entities in this package are those which are used exclusively
+--     in tests for Annex G (Numerics).
+-- 
+-- APPLICABILITY CRITERIA:
+--     This package is only required for implementations validating the
+--     Numerics Annex.
+-- 
+-- CHANGE HISTORY:
+--     29 Jan 96   SAIC    Initial version for ACVC 2.1.
+--
+--!
+ 
+package ImpDef.Annex_G is
+ 
+--=====-=====-=====-=====-=====-=====-=====-=====-=====-=====-=====-=====--
+
+   -- This function must return a "negative zero" value for implementations
+   -- for which Float'Signed_Zeros is True.
+
+   function Negative_Zero return Float;
+
+--=====-=====-=====-=====-=====-=====-=====-=====-=====-=====-=====-=====--
+
+end ImpDef.Annex_G;
+
+
+     --==================================================================--
+
+ 
+package body ImpDef.Annex_G is
+
+
+--=====-=====-=====-=====-=====-=====-=====-=====-=====-=====-=====-=====--
+
+   --  This function must return a negative zero value for implementations
+   --  for which Float'Signed_Zeros is True.
+   --  We generate the smallest normalized negative number, and divide by a
+   --  few powers of two to obtain a number whose absolute value equals zero
+   --  but whose sign is negative.
+
+   function Negative_Zero return Float is
+      negz : float := -1.0 *
+         float (float'Machine_Radix)
+            ** ( Float'Machine_Emin - Float'Machine_Mantissa); 
+   begin
+      return negz / 8.0;
+   end Negative_Zero;
+
+--=====-=====-=====-=====-=====-=====-=====-=====-=====-=====-=====-=====--
+
+end ImpDef.Annex_G;
+