c45323a.ada

来自「linux下编程用 编译软件」· ADA 代码 · 共 68 行

-- C45323A.ADA

--                             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 NONASSOCIATIVITY OF REAL ARITHMETIC IS PRESERVED
--     FOR FLOATING POINT PRECISION 5, EVEN WHEN OPTIMIZATION WOULD
--     BENEFIT IF FLOATING POINT ADDITION WERE ASSOCIATIVE.

-- HISTORY:
--     JET 08/10/88  CREATED ORIGINAL TEST.

WITH REPORT; USE REPORT;
PROCEDURE C45323A IS

     TYPE FLOAT5 IS DIGITS 5;

     A, B, C, D, E : FLOAT5;

     FUNCTION IDENT(F : FLOAT5) RETURN FLOAT5 IS
     BEGIN
          RETURN F * FLOAT5(IDENT_INT(1));
     END IDENT;

BEGIN
     TEST ("C45323A", "CHECK THAT THE NONASSOCIATIVITY OF REAL " &
                      "ARITHMETIC IS PRESERVED FOR FLOATING POINT " &
                      "PRECISION 5, EVEN WHEN OPTIMIZATION WOULD " &
                      "BENEFIT IF FLOATING POINT ADDITION WERE " &
                      "ASSOCIATIVE");

     B := 2#0.1010_1010_1010_1010_10#E3;
     A := -B;
     C := 2#0.1000_0000_0000_0000_00#E-18;
     D := B + C;
     E := A + B + C;

     IF IDENT(A) + IDENT(B) /= 0.0 THEN
          FAILED("INCORRECT VALUE OF A + B");
     END IF;

     IF IDENT(E) /= IDENT(C) THEN
          FAILED("C DOES NOT EQUAL E");
     END IF;

     RESULT;
END C45323A;