Subversion Repositories openrisc

-- CXB2003.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 32 bits.

--

-- TEST DESCRIPTION:

--      This test uses the shift and rotate functions of package Interfaces

--      with a modular type representative of 32 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 32 bits.

--

--

-- CHANGE HISTORY:

--      23 Aug 95   SAIC    Initial prerelease version.

--      07 May 96   SAIC    Incorporated reviewer comments for ACVC 2.1.

--      26 Oct 96   SAIC    Removed all references to Big/Little endian.

--

--!

with Report;

with Interfaces;

with Ada.Exceptions;

procedure CXB2003 is

begin

   Report.Test ("CXB2003",

                "Check that subprograms Shift_Left, Shift_Right, "       &

                "Shift_Right_Arithmetic, Rotate_Left, and Rotate_Right " &

                "are available and produce correct results");

   Test_Block:

   declare

      use Interfaces;

      use Ada.Exceptions;

      TC_Amount   : Natural  := Natural'First;

      -- Range of type Unsigned_32 is 0..(2**32)-1    (0..Modulus-1).

      TC_Val_Unsigned_32,

      TC_Result_Unsigned_32 : Unsigned_32 := Unsigned_32'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             := 2;

         TC_Val_Unsigned_32    := Unsigned_32'Last;

         TC_Result_Unsigned_32 := Shift_Left(TC_Val_Unsigned_32, TC_Amount);

         if TC_Result_Unsigned_32 /= Unsigned_32'Last - (2**0 + 2**1) then

            Report.Failed("Incorrect result from Shift_Left - 1");

         end if;

         TC_Result_Unsigned_32 := Unsigned_32'Last - (2**0 + 2**1 + 2**2 +

                                                      2**3 + 2**4);

         if Shift_Left(TC_Val_Unsigned_32,  5) /= TC_Result_Unsigned_32  or

            Shift_Left(TC_Val_Unsigned_32,  0) /= Unsigned_32'Last

         then

            Report.Failed("Incorrect result from Shift_Left - 2");

         end if;

      -- Function Shift_Right.

         TC_Amount             := 3;

         TC_Val_Unsigned_32    := Unsigned_32'Last;

         TC_Result_Unsigned_32 := Shift_Right(Value  => TC_Val_Unsigned_32,

                                              Amount => TC_Amount);

         if TC_Result_Unsigned_32 /=

            Unsigned_32'Last - (2**31 + 2**30 + 2**29)

         then

            Report.Failed("Incorrect result from Shift_Right - 1");

         end if;

         if Shift_Right(TC_Val_Unsigned_32,  0) /= Unsigned_32'Last    or

            Shift_Right(TC_Val_Unsigned_32,  2) /= Unsigned_32'Last -

                                                   (2**31 + 2**30)

         then

            Report.Failed("Incorrect result from Shift_Right - 2");

         end if;

      -- Tests of Shift_Left and Shift_Right in combination.

         TC_Val_Unsigned_32 := Unsigned_32'Last;

         if Shift_Left(Shift_Right(TC_Val_Unsigned_32, 4),  4) /=

            Unsigned_32'Last - (2**0 + 2**1 + 2**2 + 2**3)          or

            Shift_Left(Shift_Right(TC_Val_Unsigned_32, 3),  1) /=

            Unsigned_32'Last - (2**31 + 2**30 + 2**0)               or

            Shift_Left(Shift_Right(TC_Val_Unsigned_32, 5),  3) /=

            Unsigned_32'Last - (2**31 + 2**30 + 2**2 + 2**1 + 2**0) or

            Shift_Right(Shift_Left(TC_Val_Unsigned_32, 2),  1) /=

            Unsigned_32'Last - (2**31 + 2**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.

         TC_Amount             := 3;

         TC_Val_Unsigned_32    := 2**15 + 2**10 + 2**1;

         TC_Result_Unsigned_32 := Shift_Right_Arithmetic(TC_Val_Unsigned_32,

                                                         TC_Amount);

         if TC_Result_Unsigned_32 /= (2**12 + 2**7) then

            Report.Failed

              ("Incorrect result from Shift_Right_Arithmetic - 1");

         end if;

         if Shift_Right_Arithmetic(TC_Val_Unsigned_32, 0)  /=

            TC_Val_Unsigned_32                                  or

            Shift_Right_Arithmetic(TC_Val_Unsigned_32, 5)  /=

            (2**10 + 2**5)

         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_32    := 2**31; -- One half of modulus

         TC_Result_Unsigned_32 := Shift_Right_Arithmetic(TC_Val_Unsigned_32,

                                                         TC_Amount);

         if TC_Result_Unsigned_32 /= (2**31 + 2**30) then

            Report.Failed

              ("Incorrect result from Shift_Right_Arithmetic - 3");

         end if;

         TC_Amount             := 1;

         TC_Val_Unsigned_32    := (2**31 + 2**1);

         TC_Result_Unsigned_32 := Shift_Right_Arithmetic(TC_Val_Unsigned_32,

                                                         TC_Amount);

         if TC_Result_Unsigned_32 /= (2**31 + 2**30 + 2**0) then

            Report.Failed

              ("Incorrect result from Shift_Right_Arithmetic - 4");

         end if;

         if Shift_Right_Arithmetic(TC_Val_Unsigned_32, 0)  /=

            TC_Val_Unsigned_32                                or

            Shift_Right_Arithmetic(TC_Val_Unsigned_32, 3)  /=

            (2**31 + 2**30 + 2**29 + 2**28)

         then

            Report.Failed

              ("Incorrect result from Shift_Right_Arithmetic - 5");

         end if;

      -- Function Rotate_Left.

         TC_Amount             := 3;

         TC_Val_Unsigned_32    := Unsigned_32'Last;

         TC_Result_Unsigned_32 := Rotate_Left(Value  => TC_Val_Unsigned_32,

                                              Amount => TC_Amount);

         if TC_Result_Unsigned_32 /= Unsigned_32'Last then

            Report.Failed("Incorrect result from Rotate_Left - 1");

         end if;

         TC_Val_Unsigned_32    := 2**31 + 2**30;

         if Rotate_Left(TC_Val_Unsigned_32,  1) /= (2**31 + 2**0)  or

            Rotate_Left(TC_Val_Unsigned_32,  5) /= (2**4  + 2**3)  or

            Rotate_Left(TC_Val_Unsigned_32, 32) /= TC_Val_Unsigned_32

         then

            Report.Failed("Incorrect result from Rotate_Left - 2");

         end if;

      -- Function Rotate_Right.

         TC_Amount             := 2;

         TC_Val_Unsigned_32    := (2**1 + 2**0);

         TC_Result_Unsigned_32 := Rotate_Right(Value  => TC_Val_Unsigned_32,

                                               Amount => TC_Amount);

         if TC_Result_Unsigned_32 /= (2**31 + 2**30) then

            Report.Failed("Incorrect result from Rotate_Right - 1");

         end if;

         if Rotate_Right(TC_Val_Unsigned_32,  3) /=  (2**30 + 2**29)  or

            Rotate_Right(TC_Val_Unsigned_32,  6) /=  (2**27 + 2**26)  or

            Rotate_Right(TC_Val_Unsigned_32, 32) /=  (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_32 := (2**31 + 2**15 + 2**3);

         if Rotate_Left(Rotate_Right(TC_Val_Unsigned_32, 4),  3) /=

            (2**30 + 2**14 + 2**2)                                   or

            Rotate_Left(Rotate_Right(TC_Val_Unsigned_32, 1),  3) /=

            (2**17 + 2**5  + 2**1)                                   or

            Rotate_Right(Rotate_Left(TC_Val_Unsigned_32, 3),  7) /=

            (2**31 + 2**27 + 2**11)                                  or

            Rotate_Right(Rotate_Left(TC_Val_Unsigned_32, 1), 32) /=

            (2**16 + 2**4  + 2**0)

         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 CXB2003;