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-- CXB2003.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 
--     unlimited rights in the software and documentation contained herein.
--     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making 
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--     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;