-- C35902D.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. --* -- CHECK THAT THE BINARY POINT IN THE MANTISSA OF A FIXED POINT NUMBER -- CAN LIE OUTSIDE THE MANTISSA (EITHER TO THE LEFT OR TO THE RIGHT). -- WRG 7/18/86 WITH REPORT; USE REPORT; WITH SYSTEM; USE SYSTEM; PROCEDURE C35902D IS BEGIN TEST ("C35902D", "CHECK THAT THE BINARY POINT IN THE MANTISSA " & "OF A FIXED POINT NUMBER CAN LIE OUTSIDE THE " & "MANTISSA (EITHER TO THE LEFT OR TO THE RIGHT)"); COMMENT ("VALUE OF SYSTEM.MAX_MANTISSA IS" & POSITIVE'IMAGE(MAX_MANTISSA) ); A: DECLARE RS : CONSTANT := 2.0; TYPE ONE_TO_THE_RIGHT IS DELTA RS RANGE -(2.0 ** (MAX_MANTISSA+1) ) .. 2.0 ** (MAX_MANTISSA+1); -- THE BINARY POINT IS ONE PLACE TO THE RIGHT OF THE -- LARGEST POSSIBLE MANTISSA. R1, R2 : ONE_TO_THE_RIGHT; BEGIN R1 := RS; FOR I IN POSITIVE RANGE 1 .. MAX_MANTISSA - 1 LOOP R1 := R1 * IDENT_INT (2); END LOOP; R2 := R1 - RS; R2 := R2 + R1; -- AT THIS POINT, R2 SHOULD EQUAL ONE_TO_THE_RIGHT'LARGE. R2 := -R2; R2 := R2 + (R1 - RS); FOR I IN POSITIVE RANGE 1 .. MAX_MANTISSA - 1 LOOP R2 := R2 / IDENT_INT (2); END LOOP; IF R2 /= -RS THEN FAILED ("IDENTITY-PRESERVING OPERATIONS ARE FLAKY - A"); END IF; EXCEPTION WHEN OTHERS => FAILED ("EXCEPTION RAISED - A"); END A; B: DECLARE LS : CONSTANT := 2.0 ** (-(MAX_MANTISSA+1) ); TYPE ONE_TO_THE_LEFT IS DELTA LS RANGE -(2.0 ** (-1) ) .. 2.0 ** (-1); -- THE BINARY POINT IS ONE PLACE TO THE LEFT OF THE -- LARGEST POSSIBLE MANTISSA. L1, L2 : ONE_TO_THE_LEFT; BEGIN L1 := LS; FOR I IN POSITIVE RANGE 1 .. MAX_MANTISSA - 1 LOOP L1 := L1 * IDENT_INT (2); END LOOP; L2 := L1 - LS; L2 := L2 + L1; -- AT THIS POINT, L2 SHOULD EQUAL ONE_TO_THE_LEFT'LARGE. L2 := -L2; L2 := L2 + (L1 - LS); FOR I IN POSITIVE RANGE 1 .. MAX_MANTISSA - 1 LOOP L2 := L2 / IDENT_INT (2); END LOOP; IF L2 /= -LS THEN FAILED ("IDENTITY-PRESERVING OPERATIONS ARE FLAKY - B"); END IF; EXCEPTION WHEN OTHERS => FAILED ("EXCEPTION RAISED - B"); END B; RESULT; END C35902D;