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1 294 jeremybenn
-- IMPDEFG.A
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--
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--                             Grant of Unlimited Rights
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--
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--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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--     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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--     unlimited rights in the software and documentation contained herein.
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--     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making
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--     this public release, the Government intends to confer upon all
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--     recipients unlimited rights  equal to those held by the Government.
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--     These rights include rights to use, duplicate, release or disclose the
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--     released technical data and computer software in whole or in part, in
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--     any manner and for any purpose whatsoever, and to have or permit others
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--     to do so.
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--
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--                                    DISCLAIMER
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--
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--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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--     PARTICULAR PURPOSE OF SAID MATERIAL.
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--*
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--
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-- DESCRIPTION:
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--     This package provides tailorable entities for a particular
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--     implementation.  Each entity may be modified to suit the needs
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--     of the implementation.  Default values are provided to act as
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--     a guide.
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--
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--     The entities in this package are those which are used exclusively
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--     in tests for Annex G (Numerics).
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--
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-- APPLICABILITY CRITERIA:
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--     This package is only required for implementations validating the
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--     Numerics Annex.
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--
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-- CHANGE HISTORY:
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--     29 Jan 96   SAIC    Initial version for ACVC 2.1.
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--
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--!
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package ImpDef.Annex_G is
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--=====-=====-=====-=====-=====-=====-=====-=====-=====-=====-=====-=====--
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   -- This function must return a "negative zero" value for implementations
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   -- for which Float'Signed_Zeros is True.
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   function Negative_Zero return Float;
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--=====-=====-=====-=====-=====-=====-=====-=====-=====-=====-=====-=====--
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end ImpDef.Annex_G;
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     --==================================================================--
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package body ImpDef.Annex_G is
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--=====-=====-=====-=====-=====-=====-=====-=====-=====-=====-=====-=====--
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   --  This function must return a negative zero value for implementations
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   --  for which Float'Signed_Zeros is True.
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   --  We generate the smallest normalized negative number, and divide by a
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   --  few powers of two to obtain a number whose absolute value equals zero
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   --  but whose sign is negative.
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   function Negative_Zero return Float is
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      negz : float := -1.0 *
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         float (float'Machine_Radix)
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            ** ( Float'Machine_Emin - Float'Machine_Mantissa);
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   begin
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      return negz / 8.0;
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   end Negative_Zero;
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--=====-=====-=====-=====-=====-=====-=====-=====-=====-=====-=====-=====--
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end ImpDef.Annex_G;
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