-- 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;