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jeremybenn |
-- C460011.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 and
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-- F08630-91-C-0015, the U.S. Government obtained unlimited rights in the
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-- software and documentation contained herein. Unlimited rights are
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-- defined in DFAR 252.227-7013(a)(19). By making this public release,
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-- the Government intends to confer upon all recipients unlimited rights
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-- equal to those held by the Government. These rights include rights to
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-- use, duplicate, release or disclose the released technical data and
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-- computer software in whole or in part, in any manner and for any purpose
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-- whatsoever, and to have or permit others 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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-- OBJECTIVE:
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-- Check that conversion of a decimal type to a modular type raises
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-- Constraint_Error when the operand value is outside the base range
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-- of the modular type.
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-- Check that a conversion of a decimal type to an integer type
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-- rounds correctly.
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--
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-- TEST DESCRIPTION:
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-- Test conversion from decimal types to modular types. Test
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-- conversion to mod 255, mod 256 and mod 258 to test the boundaries
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-- of 8 bit (+/-) unsigned numbers.
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-- Test operand values that are negative, the value of the mod,
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-- and greater than the value of the mod.
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-- Declare a generic test procedure and instantiate it for each of the
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-- unsigned types for each operand type.
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-- Check that the the operand is properly rounded during the conversion.
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--
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-- APPLICABILITY CRITERIA:
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-- This test is applicable to all implementations which support
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-- decimal types.
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--
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-- CHANGE HISTORY:
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-- 24 NOV 98 RLB Split decimal cases from C460008 into this
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-- test, added conversions to integer types.
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-- 18 JAN 99 RLB Repaired errors in test.
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--
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--!
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------------------------------------------------------------------- C460011
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with Report;
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procedure C460011 is
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Shy_By_One : constant := 2**8-1;
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Heavy_By_Two : constant := 2**8+2;
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type Unsigned_Edge_8 is mod Shy_By_One;
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type Unsigned_8_Bit is mod 2**8;
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type Unsigned_Over_8 is mod Heavy_By_Two;
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type Signed_8_Bit is range -128 .. 127;
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type Signed_Over_8 is range -200 .. 200;
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NPC : constant String := " not properly converted";
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procedure Assert( Truth: Boolean; Message: String ) is
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begin
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if not Truth then
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Report.Failed(Message);
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end if;
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end Assert;
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-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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type Decim is delta 0.1 digits 5; -- N/A => ERROR.
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generic
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type Source is delta <> digits <>;
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type Target is mod <>;
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procedure Decimal_Conversion_Check( For_The_Value : Source;
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Message : String );
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procedure Decimal_Conversion_Check( For_The_Value : Source;
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Message : String ) is
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Item : Target;
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begin
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Item := Target( For_The_Value );
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Report.Failed("Deci expected Constraint_Error " & Message);
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Report.Comment("Value of" & Target'Image(Item) & NPC);
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exception
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when Constraint_Error => null; -- expected case
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when others => Report.Failed("Deci raised wrong exception " & Message);
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end Decimal_Conversion_Check;
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procedure Decim_To_Short is
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new Decimal_Conversion_Check( Decim, Unsigned_Edge_8 );
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procedure Decim_To_Eight is
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new Decimal_Conversion_Check( Decim, Unsigned_8_Bit );
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procedure Decim_To_Wide is
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new Decimal_Conversion_Check( Decim, Unsigned_Over_8 );
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function Identity( Launder: Decim ) return Decim is
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Flat_Broke : constant Decim := 0.0;
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begin
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if Report.Ident_Bool( Launder = Flat_Broke ) then
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return Flat_Broke;
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else
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return Launder;
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end if;
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end Identity;
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-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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begin -- Main test procedure.
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Report.Test ("C460011", "Check that conversion to " &
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"a modular type raises Constraint_Error when " &
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"the operand value is outside the base range " &
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"of the modular type" );
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-- Decimal Error cases
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Decim_To_Short( Identity( -5.00 ), "M2S Dynamic, Negative" );
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Decim_To_Short( Shy_By_One * 1.0, "M2S Static, At_Mod" );
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Decim_To_Short( 1995.9, "M2S Static, Over_Mod" );
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Decim_To_Eight( -0.5, "M28 Static, Negative" );
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Decim_To_Eight( 2.0*128, "M28 Static, At_Mod" );
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Decim_To_Eight( Identity( 2001.2 ), "M28 Dynamic, Over_Mod" );
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Decim_To_Wide ( Decim'First, "M2W Static, Negative" );
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Decim_To_Wide ( Identity( 2*128.0 +2.0 ), "M2W Dynamic, At_Mod" );
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Decim_To_Wide ( Decim'Last, "M2W Static, Over_Mod" );
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-- Check a few, correct, edge cases, for modular types.
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Eye_Dew: declare
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Sense : Decim := 0.00;
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Little : Unsigned_Edge_8;
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Moderate : Unsigned_8_Bit;
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Big : Unsigned_Over_8;
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begin
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Moderate := Unsigned_8_Bit (Sense);
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Assert( Moderate = 0, "Sense => Moderate, 0");
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Sense := 2*128.0;
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Big := Unsigned_Over_8 (Sense);
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Assert( Big = 256, "Sense => Big, 256");
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end Eye_Dew;
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Rounding: declare
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Easy : Decim := Identity ( 2.0);
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Simple : Decim := Identity ( 2.1);
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Halfway : Decim := Identity ( 2.5);
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Upward : Decim := Identity ( 2.8);
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Chop : Decim := Identity (-2.2);
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Neg_Half : Decim := Identity (-2.5);
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Downward : Decim := Identity (-2.7);
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Little : Unsigned_Edge_8;
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Moderate : Unsigned_8_Bit;
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Big : Unsigned_Over_8;
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Also_Little:Signed_8_Bit;
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Also_Big : Signed_Over_8;
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begin
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Little := Unsigned_Edge_8 (Easy);
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Assert( Little = 2, "Easy => Little, 2");
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Moderate := Unsigned_8_Bit (Simple);
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Assert( Moderate = 2, "Simple => Moderate, 2");
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Big := Unsigned_Over_8 (Halfway); -- Rounds up by 4.6(33).
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Assert( Big = 3, "Halfway => Big, 3");
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Little := Unsigned_Edge_8 (Upward);
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Assert( Little = 3, "Upward => Little, 3");
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Also_Big := Signed_Over_8 (Halfway); -- Rounds up by 4.6(33).
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Assert( Also_Big = 3, "Halfway => Also_Big, 3");
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Also_Little := Signed_8_Bit (Chop);
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Assert( Also_Little = -2, "Chop => Also_Little, -2");
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Also_Big := Signed_Over_8 (Neg_Half); -- Rounds down by 4.6(33).
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Assert( Also_Big = -3, "Halfway => Also_Big, -3");
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Also_Little := Signed_8_Bit (Downward);
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Assert( Also_Little = -3, "Downward => Also_Little, -3");
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end Rounding;
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Report.Result;
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end C460011;
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