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|
-- CXB2002.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.
--*
--
-- OBJECTIVE:
-- Check that subprograms Shift_Left, Shift_Right,
-- Shift_Right_Arithmetic, Rotate_Left, and Rotate_Right are available
-- and produce correct results for values of signed and modular
-- integer types of 16 bits.
--
-- TEST DESCRIPTION:
-- This test uses the shift and rotate functions of package Interfaces
-- with a modular type representative of 16 bits. The functions
-- are used as the right hand of assignment statements, as part of
-- conditional statements, and as arguments in other function calls.
--
-- APPLICABILITY CRITERIA:
-- This test is applicable to all implementations that support signed
-- and modular integer types of 16 bits.
--
--
-- CHANGE HISTORY:
-- 21 Aug 95 SAIC Initial prerelease version.
-- 07 May 96 SAIC Incorporated reviewer comments for ACVC 2.1.
-- 26 Oct 96 SAIC Removed subtests based on Big/Little Endian.
-- 17 Feb 97 PWB.CTA Corrected "-" to "+" in parenthesized expressions.
--!
with Report;
with Interfaces;
with Ada.Exceptions;
procedure CXB2002 is
begin
Report.Test ("CXB2002",
"Check that subprograms Shift_Left, Shift_Right, " &
"Shift_Right_Arithmetic, Rotate_Left, and Rotate_Right " &
"produce correct results for values of signed and " &
"modular integer types of 16 bits");
Test_Block:
declare
use Ada.Exceptions;
use Interfaces;
TC_Amount : Natural := Natural'First;
-- Range of type Unsigned_16 is 0..65535 (0..Modulus-1).
TC_Val_Unsigned_16,
TC_Result_Unsigned_16 : Unsigned_16 := Unsigned_16'First;
begin
-- Note: The shifting and rotating subprograms operate on a bit-by-bit
-- basis, using the binary representation of the value of the
-- operands to yield a binary representation for the result.
-- Function Shift_Left.
TC_Amount := 3;
TC_Val_Unsigned_16 := Unsigned_16'Last; -- 65535.
TC_Result_Unsigned_16 := Shift_Left(TC_Val_Unsigned_16, TC_Amount);
if TC_Result_Unsigned_16 /= Unsigned_16'Last - (2**0 + 2**1 + 2**2)
then
Report.Failed("Incorrect result from Shift_Left - 1");
end if;
if Shift_Left(TC_Val_Unsigned_16, 0) /= Unsigned_16'Last or
Shift_Left(TC_Val_Unsigned_16, 5) /=
Unsigned_16'Last - (2**0 + 2**1 + 2**2 + 2**3 +2**4) or
Shift_Left(TC_Val_Unsigned_16, 16) /= 0
then
Report.Failed("Incorrect result from Shift_Left - 2");
end if;
-- Function Shift_Right.
TC_Amount := 3;
TC_Val_Unsigned_16 := Unsigned_16'Last; -- 65535.
TC_Result_Unsigned_16 := Shift_Right(Value => TC_Val_Unsigned_16,
Amount => TC_Amount);
if TC_Result_Unsigned_16 /= Unsigned_16'Last-(2**15 + 2**14 + 2**13)
then
Report.Failed("Incorrect result from Shift_Right - 1");
end if;
if Shift_Right(TC_Val_Unsigned_16, 0) /= Unsigned_16'Last or
Shift_Right(TC_Val_Unsigned_16, 5) /=
Unsigned_16'Last-(2**15 + 2**14 + 2**13 + 2**12 + 2**11) or
Shift_Right(TC_Val_Unsigned_16, 16) /= 0
then
Report.Failed("Incorrect result from Shift_Right - 2");
end if;
-- Tests of Shift_Left and Shift_Right in combination.
TC_Val_Unsigned_16 := Unsigned_16'Last;
if Shift_Left(Shift_Right(TC_Val_Unsigned_16, 4), 4) /=
Unsigned_16'Last-(2**0 + 2**1 + 2**2 + 2**3) or
Shift_Left(Shift_Right(TC_Val_Unsigned_16, 1), 3) /=
Unsigned_16'Last-(2**0 + 2**1 + 2**2) or
Shift_Right(Shift_Left(TC_Val_Unsigned_16, 2), 4) /=
Unsigned_16'Last-(2**15+ 2**14 + 2**13 + 2**12) or
Shift_Right(Shift_Left(TC_Val_Unsigned_16, 2), 16) /= 0
then
Report.Failed("Incorrect result from Shift_Left - " &
"Shift_Right functions used in combination");
end if;
-- Function Shift_Right_Arithmetic.
-- Case where the parameter Value is less than
-- one half of the modulus. Zero bits will be shifted in.
-- Modulus of type Unsigned_16 is 2**16; one half is 2**15.
TC_Amount := 3;
TC_Val_Unsigned_16 := 2**15 - 1; -- Less than one half of modulus.
TC_Result_Unsigned_16 := Shift_Right_Arithmetic(TC_Val_Unsigned_16,
TC_Amount);
if TC_Result_Unsigned_16 /=
TC_Val_Unsigned_16 - (2**14 + 2**13 + 2**12)
then
Report.Failed
("Incorrect result from Shift_Right_Arithmetic - 1");
end if;
if Shift_Right_Arithmetic(TC_Val_Unsigned_16, 0) /=
TC_Val_Unsigned_16 or
Shift_Right_Arithmetic(TC_Val_Unsigned_16, 5) /=
TC_Val_Unsigned_16 - (2**14 + 2**13 + 2**12 + 2**11 + 2**10) or
Shift_Right_Arithmetic(TC_Val_Unsigned_16, 16) /= 0
then
Report.Failed
("Incorrect result from Shift_Right_Arithmetic - 2");
end if;
-- Case where the parameter Value is greater than or equal to
-- one half of the modulus. One bits will be shifted in.
TC_Amount := 1;
TC_Val_Unsigned_16 := 2**15; -- One half of modulus.
TC_Result_Unsigned_16 := Shift_Right_Arithmetic(TC_Val_Unsigned_16,
TC_Amount);
if TC_Result_Unsigned_16 /= TC_Val_Unsigned_16 + 2**14 then
Report.Failed
("Incorrect result from Shift_Right_Arithmetic - 3");
end if;
TC_Amount := 1;
TC_Val_Unsigned_16 := 2**15 + 1; -- Greater than half of modulus.
TC_Result_Unsigned_16 := Shift_Right_Arithmetic(TC_Val_Unsigned_16,
TC_Amount);
if TC_Result_Unsigned_16 /= TC_Val_Unsigned_16 + 2**14 - 2**0 then
Report.Failed
("Incorrect result from Shift_Right_Arithmetic - 4");
end if;
if Shift_Right_Arithmetic(TC_Val_Unsigned_16, 0) /=
TC_Val_Unsigned_16 or
Shift_Right_Arithmetic(TC_Val_Unsigned_16, 4) /=
TC_Val_Unsigned_16 - 2**0 + 2**14 + 2**13 + 2**12 + 2**11 or
Shift_Right_Arithmetic(TC_Val_Unsigned_16, 16) /= Unsigned_16'Last
then
Report.Failed
("Incorrect result from Shift_Right_Arithmetic - 5");
end if;
-- Function Rotate_Left.
TC_Amount := 3;
TC_Val_Unsigned_16 := Unsigned_16'Last; -- 65535.
TC_Result_Unsigned_16 := Rotate_Left(Value => TC_Val_Unsigned_16,
Amount => TC_Amount);
if TC_Result_Unsigned_16 /= Unsigned_16'Last then
Report.Failed("Incorrect result from Rotate_Left - 1");
end if;
TC_Val_Unsigned_16 := 2**15 + 2**14 + 2**1 + 2**0;
if Rotate_Left(TC_Val_Unsigned_16, 0) /=
2**15 + 2**14 + 2**1 + 2**0 or
Rotate_Left(TC_Val_Unsigned_16, 5) /=
2**6 + 2**5 + 2**4 + 2**3 or
Rotate_Left(TC_Val_Unsigned_16, 16) /= TC_Val_Unsigned_16
then
Report.Failed("Incorrect result from Rotate_Left - 2");
end if;
-- Function Rotate_Right.
TC_Amount := 1;
TC_Val_Unsigned_16 := 2**1 + 2**0;
TC_Result_Unsigned_16 := Rotate_Right(Value => TC_Val_Unsigned_16,
Amount => TC_Amount);
if TC_Result_Unsigned_16 /= 2**15 + 2**0 then
Report.Failed("Incorrect result from Rotate_Right - 1");
end if;
if Rotate_Right(TC_Val_Unsigned_16, 0) /= 2**1 + 2**0 or
Rotate_Right(TC_Val_Unsigned_16, 5) /= 2**12 + 2**11 or
Rotate_Right(TC_Val_Unsigned_16, 16) /= 2**1 + 2**0
then
Report.Failed("Incorrect result from Rotate_Right - 2");
end if;
-- Tests of Rotate_Left and Rotate_Right in combination.
TC_Val_Unsigned_16 := 32769;
if Rotate_Left(Rotate_Right(TC_Val_Unsigned_16, 4), 3) /= 49152 or
Rotate_Left(Rotate_Right(TC_Val_Unsigned_16, 1), 3) /= 6 or
Rotate_Right(Rotate_Left(TC_Val_Unsigned_16, 3), 7) /= 6144 or
Rotate_Right(Rotate_Left(TC_Val_Unsigned_16, 1), 16) /= 3
then
Report.Failed("Incorrect result from Rotate_Left - " &
"Rotate_Right functions used in combination");
end if;
exception
when The_Error : others =>
Report.Failed ("The following exception was raised in the " &
"Test_Block: " & Exception_Name(The_Error));
end Test_Block;
Report.Result;
end CXB2002;
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