cxf2004.a

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-- CXF2004.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 the multiplying operators for a decimal fixed point type
--      return values that are integral multiples of the small of the type.
--      Check the case where one operand is of an ordinary fixed point type.
--
--      Check that if the mathematical result is between multiples of the
--      small of the result type, the result is truncated toward zero.
--      Check that if the attribute 'Round is applied to the mathematical
--      result, however, the result is rounded to the nearest multiple of
--      the small (away from zero if the result is midway between two
--      multiples of the small).
--    
-- TEST DESCRIPTION:
--      Two decimal fixed point types A and B are declared, one with a
--      Machine_Radix value of 2, and one with a value of 10. An ordinary
--      fixed point type C is declared with a delta value different from
--      those of A and B (although still a power of 10). For type A (and B),
--      checks are performed on the following operations, where one operand
--      type is C, and the other operand type and the result type is A (or B):
--
--         - Multiplication.
--         - Multiplication, where the attribute 'Round is applied to the
--           result.
--         - Division.
--         - Division, where the attribute 'Round is applied to the result.
--
--      Each operation is performed within a loop, where one operand is
--      always the same variable. After the loop completes, the cumulative
--      total contained in this variable is compared with the expected
--      result.
--
-- APPLICABILITY CRITERIA:
--      This test is only applicable for a compiler attempting validation
--      for the Information Systems Annex.
--
--
-- CHANGE HISTORY:
--      22 Mar 96   SAIC    Prerelease version for ACVC 2.1.
--      11 Aug 96   SAIC    ACVC 2.1: In RADIX_2_MULTIPLICATION, corrected
--                          value of Rate. Corrected associated commentary.
--
--!

generic
   type Decimal_Fixed  is delta <> digits <>;
   type Ordinary_Fixed is delta <>;
package CXF2004_0 is

   procedure Multiply_And_Truncate (Balance : in out Decimal_Fixed;
                                    Factor  : in     Ordinary_Fixed);

   procedure Divide_And_Truncate   (Balance : in out Decimal_Fixed;
                                    Divisor : in     Ordinary_Fixed);

   procedure Multiply_And_Round    (Balance : in out Decimal_Fixed;
                                    Factor  : in     Ordinary_Fixed);

   procedure Divide_And_Round      (Balance : in out Decimal_Fixed;
                                    Divisor : in     Ordinary_Fixed);

end CXF2004_0;


     --==================================================================--


package body CXF2004_0 is

   procedure Multiply_And_Truncate (Balance : in out Decimal_Fixed;
                                    Factor  : in     Ordinary_Fixed) is
      Interest : Decimal_Fixed;
   begin
      Interest := Factor * Balance;      -- Fixed-fixed multiplication.
      Balance  := Balance + Interest;
   end Multiply_And_Truncate;


   procedure Divide_And_Truncate (Balance : in out Decimal_Fixed;
                                  Divisor : in     Ordinary_Fixed) is
      Interest : Decimal_Fixed;
   begin
      Interest := Balance / Divisor;     -- Fixed-fixed division.
      Balance  := Balance + Interest;
   end Divide_And_Truncate;


   procedure Multiply_And_Round (Balance : in out Decimal_Fixed;
                                 Factor  : in     Ordinary_Fixed) is
      Interest : Decimal_Fixed;
   begin
                                         -- Fixed-fixed multiplication.
      Interest := Decimal_Fixed'Round ( Factor * Balance );
      Balance  := Balance + Interest;
   end Multiply_And_Round;


   procedure Divide_And_Round (Balance : in out Decimal_Fixed;
                               Divisor : in     Ordinary_Fixed) is
      Interest : Decimal_Fixed;
   begin
                                         -- Fixed-fixed division.
      Interest := Decimal_Fixed'Round ( Balance / Divisor );
      Balance  := Balance + Interest;
   end Divide_And_Round;

end CXF2004_0;


     --==================================================================--


package CXF2004_1 is

   type Money_Radix2 is delta 0.01 digits 11;    -- range -999,999,999.99 ..
   for Money_Radix2'Machine_Radix use 2;         --       +999,999,999.99


   type Money_Radix10 is delta 0.01 digits 11;   -- range -999,999,999.99 ..
   for Money_Radix10'Machine_Radix use 10;       --       +999,999,999.99


   type Interest_Rate is delta 0.001 range 0.0 .. 1_000.0;
   for Interest_Rate'Small use 0.001;            -- Power of 10.

end CXF2004_1;


     --==================================================================--


with CXF2004_0;
with CXF2004_1;

with Report;
procedure CXF2004 is

   Loop_Count : constant := 180;
   type Loop_Range is range 1 .. Loop_Count;

   type Rounding_Scheme is ( Rounds, Truncates );
   Machine : Rounding_Scheme;

begin

   Report.Test ("CXF2004", "Check decimal multiplication and division, and " &
                           "'Round, where one operand type is ordinary fixed");


               ---=---=---=---=---=---=---=---=---=---=---

   if CXF2004_1.Interest_Rate'Machine_Rounds then  -- Determine machine's
      Machine := Rounds;                           -- rounding scheme.
   else
      Machine := Truncates;
   end if;

               ---=---=---=---=---=---=---=---=---=---=---


   RADIX_2_SUBTESTS:
   declare
      package Radix_2 is new CXF2004_0 (CXF2004_1.Money_Radix2,
                                        CXF2004_1.Interest_Rate);
      use type CXF2004_1.Money_Radix2;
      use type CXF2004_1.Interest_Rate;
   begin

      RADIX_2_MULTIPLICATION:
      declare
         Rate           : constant CXF2004_1.Interest_Rate := 0.154;
         Period         : constant Integer                 := 12;
         Factor         :          CXF2004_1.Interest_Rate := Rate / Period;

         -- The exact value of Factor is:
         --
         --    0.154/12 = 0.01283333...
         --
         -- The adjacent multiples of small are 0.012 and 0.013. Since
         -- Factor is of an ordinary fixed point type, it may contain either
         -- of these values. However, since "Rate / Period" is a static
         -- expression, the value Factor contains is determined by the
         -- value of CXF2004_1.Interest_Rate'Machine_Rounds:
         --
         --    If Machine_Rounds = FALSE : Factor = 0.012
         --    If Machine_Rounds = TRUE  : Factor = 0.013

         Initial                : constant CXF2004_1.Money_Radix2 :=  1_000.00;

         Trunc_Expected_MachTrnc: constant CXF2004_1.Money_Radix2 :=  8_557.07;
         Round_Expected_MachTrnc: constant CXF2004_1.Money_Radix2 :=  8_560.47;

         Trunc_Expected_MachRnds: constant CXF2004_1.Money_Radix2 := 10_222.65;
         Round_Expected_MachRnds: constant CXF2004_1.Money_Radix2 := 10_225.81;

         Balance                : CXF2004_1.Money_Radix2;
      begin
                       ---=---=---=---=---=---=---

         Balance := Initial;

         for I in Loop_Range loop
            Radix_2.Multiply_And_Truncate (Balance, Factor);
         end loop;

         case (Machine) is
            when Rounds    => 
               if Balance /= Trunc_Expected_MachRnds then
                  Report.Failed ("Error (R): Radix 2 multiply and truncate");
               end if;
            when Truncates =>
               if Balance /= Trunc_Expected_MachTrnc then
                  Report.Failed ("Error (T): Radix 2 multiply and truncate");
               end if;
         end case;

                       ---=---=---=---=---=---=---

         Balance := Initial;

         for I in Loop_Range loop
            Radix_2.Multiply_And_Round (Balance, Factor);
         end loop;

         case (Machine) is
            when Rounds    => 
               if Balance /= Round_Expected_MachRnds then
                  Report.Failed ("Error (R): Radix 2 multiply and round");
               end if;
            when Truncates =>
               if Balance /= Round_Expected_MachTrnc then
                  Report.Failed ("Error (T): Radix 2 multiply and round");
               end if;