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-- C45532N.DEP

--                             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 OPERATOR "/" PRODUCES CORRECT RESULTS

--     FOR FIXED POINT TYPES USING 3 SUBTESTS.

--       THIS TEST REQUIRES MIN_WORD_LENGTH = 48.

--       THIS TEST USES VALUES OF DELTA WHICH ARE LESS THAN 0.5.

--

--     TEST CASES ARE:

--       A) THE OPERATOR /, A, B, AND A / B ALL MODEL NUMBERS.

--       B) THE OPERATOR /, A, B MODEL NUMBERS A / B NOT.

--       C) THE OPERATOR /, USING NO MODEL NUMBERS.

--

--     REPEAT FOR MINIMUM REQUIRED WORD LENGTHS OF 12, 16, 32 AND 48,

--     WITH RANGE <, =, AND > THAN 1.0 AND

--     WITH DELTA <, =, AND > THAN 1.0.

-- APPLICABILITY CRITERIA:

--     THIS TEST IS APPLICABLE FOR IMPLEMENTATIONS WHICH HAVE A

--     'MAX_MANTISSA OF 47 OR GREATER.

-- IF 'MAX_MANTISSA >= 47 IS NOT SUPPORTED THEN THE DECLARATION OF

--    'TYPE FX_OP5' MUST BE REJECTED.

-- HISTORY:

--     NTW 09/08/86 CREATED ORIGINAL TEST.

--     RJW 11/05/86 REVISED COMMENTS.

--     DHH 10/19/87 SHORTENED LINES CONTAINING MORE THAN 72 CHARACTERS.

--     RDH 04/27/90 REVISED APPLICABILITY CRITERIA.

WITH REPORT;

PROCEDURE C45532N IS

     USE REPORT;

     MIN_WORD_LENGTH : CONSTANT := 48;            -- MUST BE EVEN & >= 6

     FULL_SCALE      : CONSTANT := 2 ** (MIN_WORD_LENGTH - 1);

     FORTH           : CONSTANT := FULL_SCALE / 4;

     A_THIRD         : CONSTANT := FULL_SCALE / 3;

     DEL1            : CONSTANT := 0.5 / FULL_SCALE;

     TYPE FX_0P5 IS DELTA DEL1 * 1 RANGE -0.5 ..

                                      0.5 - DEL1 * 1; -- N/A => ERROR.

     TYPE FX_1   IS DELTA DEL1 * 2 RANGE -1.0 ..

                                      1.0 - DEL1 * 2; -- N/A => ERROR.

     TYPE FX_2   IS DELTA DEL1 * 4 RANGE -2.0 ..

                                      2.0 - DEL1 * 4; -- N/A => ERROR.

BEGIN TEST ("C45532N", "FIXED POINT OPERATOR ""/""" );

     --------------------------------------------------

     -- CASE A) THE OPERATOR /, A, B, AND A / B ALL MODEL NUMBERS.

A:   DECLARE

          A              : FX_0P5  := 0.0;

          B              : FX_1    := 0.0;

          RESULT_VALUE   : FX_2    := 0.0;

          LOWEST_ACCEPTABLE_VALUE  : FX_2 := FX_2 (0.5);

          HIGHEST_ACCEPTABLE_VALUE : FX_2 := FX_2 (0.5);

     BEGIN

          IF EQUAL (3, 3) THEN

               A := FX_0P5 (0.125);               -- A MODEL NUMBER

               B := FX_1   (0.25);                -- A MODEL NUMBER

          END IF;

          RESULT_VALUE := FX_2 (A / B);

          IF    (RESULT_VALUE < LOWEST_ACCEPTABLE_VALUE)

             OR (RESULT_VALUE > HIGHEST_ACCEPTABLE_VALUE) THEN

               FAILED ("RESULT OF ""/"" OUTSIDE RESULT MODEL INTERVAL "

                    &  "WHEN A, B, AND A / B ARE ALL MODEL NUMBERS");

          END IF;

     END A;

     --------------------------------------------------

     -- CASE B) THE OPERATOR /, A, B MODEL NUMBERS A / B NOT.

B:   DECLARE

          A              : FX_0P5  := 0.0;

          B              : FX_0P5  := 0.0;

          RESULT_VALUE   : FX_1    := 0.0;

          LOWEST_ACCEPTABLE_VALUE  :  FX_1

                                   := FX_1 (2 * DEL1 * A_THIRD);

          HIGHEST_ACCEPTABLE_VALUE :  FX_1

                                   := FX_1 (2 * DEL1 * (A_THIRD + 1) );

     BEGIN

          IF EQUAL (3, 3) THEN

               A := FX_0P5 (DEL1 * 1);            -- A MODEL NUMBER

               B := FX_0P5 (DEL1 * 3);            -- A MODEL NUMBER

          END IF;

          RESULT_VALUE := FX_1 (A / B);

          IF    (RESULT_VALUE < LOWEST_ACCEPTABLE_VALUE)

             OR (RESULT_VALUE > HIGHEST_ACCEPTABLE_VALUE) THEN

               FAILED ("RESULT OF ""/"" OUTSIDE RESULT MODEL INTERVAL "

                    &  "WHEN A, B MODEL NUMBERS A / B NOT");

          END IF;

     END B;

     --------------------------------------------------

     -- CASE C) THE OPERATOR /, USING NO MODEL NUMBERS

C:   DECLARE

          A              : FX_1    := 0.0;

          B              : FX_1    := 0.0;

          RESULT_VALUE   : FX_0P5  := 0.0;

          LOW_COUNT    : CONSTANT  := 2 * A_THIRD;

                            --   := (2 * FULL_SCALE * (2 * FORTH + 0))

                            --                      / (6 * FORTH + 2);

          HIGH_COUNT   : CONSTANT  := 2 * A_THIRD + 4;

                            --   := (2 * FULL_SCALE * (2 * FORTH + 2))

                            --                      / (6 * FORTH + 0);

          LOWEST_ACCEPTABLE_VALUE  :  FX_0P5

                                   := FX_0P5 (DEL1 * LOW_COUNT );

          HIGHEST_ACCEPTABLE_VALUE :  FX_0P5

                                   := FX_0P5 (DEL1 * HIGH_COUNT );

     BEGIN

          IF EQUAL (3, 3) THEN     -- A AND B NOT MODEL NUMBERS

               A := FX_1 (DEL1 * (2 * FORTH + 1));

               B := FX_1 (DEL1 * (6 * FORTH + 1));

          END IF;

          RESULT_VALUE := FX_0P5 (A / B);

          IF    (RESULT_VALUE < LOWEST_ACCEPTABLE_VALUE)

             OR (RESULT_VALUE > HIGHEST_ACCEPTABLE_VALUE) THEN

               FAILED ("RESULT OF ""/"" OUTSIDE RESULT MODEL INTERVAL "

                    &  "WHEN USING NO MODEL NUMBERS");

          END IF;

     END C;

     --------------------------------------------------

     RESULT;

END C45532N;