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-- CXB2002.A

--

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--     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

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--

--                                    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

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--     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;