| -- 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; |
