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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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