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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;
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