-- C35902D.ADA
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-- C35902D.ADA
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-- Grant of Unlimited Rights
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-- Grant of Unlimited Rights
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--
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--
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-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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-- unlimited rights in the software and documentation contained herein.
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-- unlimited rights in the software and documentation contained herein.
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-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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-- this public release, the Government intends to confer upon all
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-- this public release, the Government intends to confer upon all
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-- recipients unlimited rights equal to those held by the Government.
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-- recipients unlimited rights equal to those held by the Government.
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-- These rights include rights to use, duplicate, release or disclose the
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-- These rights include rights to use, duplicate, release or disclose the
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-- released technical data and computer software in whole or in part, in
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-- released technical data and computer software in whole or in part, in
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-- any manner and for any purpose whatsoever, and to have or permit others
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-- any manner and for any purpose whatsoever, and to have or permit others
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-- to do so.
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-- to do so.
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--
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--
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-- DISCLAIMER
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-- DISCLAIMER
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--
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--
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-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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-- PARTICULAR PURPOSE OF SAID MATERIAL.
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-- PARTICULAR PURPOSE OF SAID MATERIAL.
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--*
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--*
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-- CHECK THAT THE BINARY POINT IN THE MANTISSA OF A FIXED POINT NUMBER
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-- CHECK THAT THE BINARY POINT IN THE MANTISSA OF A FIXED POINT NUMBER
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-- CAN LIE OUTSIDE THE MANTISSA (EITHER TO THE LEFT OR TO THE RIGHT).
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-- CAN LIE OUTSIDE THE MANTISSA (EITHER TO THE LEFT OR TO THE RIGHT).
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-- WRG 7/18/86
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-- WRG 7/18/86
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WITH REPORT; USE REPORT;
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WITH REPORT; USE REPORT;
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WITH SYSTEM; USE SYSTEM;
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WITH SYSTEM; USE SYSTEM;
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PROCEDURE C35902D IS
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PROCEDURE C35902D IS
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BEGIN
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BEGIN
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TEST ("C35902D", "CHECK THAT THE BINARY POINT IN THE MANTISSA " &
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TEST ("C35902D", "CHECK THAT THE BINARY POINT IN THE MANTISSA " &
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"OF A FIXED POINT NUMBER CAN LIE OUTSIDE THE " &
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"OF A FIXED POINT NUMBER CAN LIE OUTSIDE THE " &
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"MANTISSA (EITHER TO THE LEFT OR TO THE RIGHT)");
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"MANTISSA (EITHER TO THE LEFT OR TO THE RIGHT)");
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COMMENT ("VALUE OF SYSTEM.MAX_MANTISSA IS" &
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COMMENT ("VALUE OF SYSTEM.MAX_MANTISSA IS" &
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POSITIVE'IMAGE(MAX_MANTISSA) );
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POSITIVE'IMAGE(MAX_MANTISSA) );
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A: DECLARE
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A: DECLARE
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RS : CONSTANT := 2.0;
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RS : CONSTANT := 2.0;
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TYPE ONE_TO_THE_RIGHT IS
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TYPE ONE_TO_THE_RIGHT IS
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DELTA RS
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DELTA RS
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RANGE -(2.0 ** (MAX_MANTISSA+1) ) ..
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RANGE -(2.0 ** (MAX_MANTISSA+1) ) ..
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2.0 ** (MAX_MANTISSA+1);
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2.0 ** (MAX_MANTISSA+1);
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-- THE BINARY POINT IS ONE PLACE TO THE RIGHT OF THE
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-- THE BINARY POINT IS ONE PLACE TO THE RIGHT OF THE
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-- LARGEST POSSIBLE MANTISSA.
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-- LARGEST POSSIBLE MANTISSA.
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R1, R2 : ONE_TO_THE_RIGHT;
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R1, R2 : ONE_TO_THE_RIGHT;
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BEGIN
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BEGIN
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R1 := RS;
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R1 := RS;
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FOR I IN POSITIVE RANGE 1 .. MAX_MANTISSA - 1 LOOP
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FOR I IN POSITIVE RANGE 1 .. MAX_MANTISSA - 1 LOOP
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R1 := R1 * IDENT_INT (2);
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R1 := R1 * IDENT_INT (2);
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END LOOP;
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END LOOP;
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R2 := R1 - RS;
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R2 := R1 - RS;
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R2 := R2 + R1;
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R2 := R2 + R1;
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-- AT THIS POINT, R2 SHOULD EQUAL ONE_TO_THE_RIGHT'LARGE.
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-- AT THIS POINT, R2 SHOULD EQUAL ONE_TO_THE_RIGHT'LARGE.
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R2 := -R2;
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R2 := -R2;
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R2 := R2 + (R1 - RS);
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R2 := R2 + (R1 - RS);
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FOR I IN POSITIVE RANGE 1 .. MAX_MANTISSA - 1 LOOP
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FOR I IN POSITIVE RANGE 1 .. MAX_MANTISSA - 1 LOOP
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R2 := R2 / IDENT_INT (2);
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R2 := R2 / IDENT_INT (2);
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END LOOP;
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END LOOP;
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IF R2 /= -RS THEN
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IF R2 /= -RS THEN
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FAILED ("IDENTITY-PRESERVING OPERATIONS ARE FLAKY - A");
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FAILED ("IDENTITY-PRESERVING OPERATIONS ARE FLAKY - A");
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END IF;
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END IF;
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EXCEPTION
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EXCEPTION
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WHEN OTHERS =>
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WHEN OTHERS =>
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FAILED ("EXCEPTION RAISED - A");
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FAILED ("EXCEPTION RAISED - A");
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END A;
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END A;
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B: DECLARE
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B: DECLARE
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LS : CONSTANT := 2.0 ** (-(MAX_MANTISSA+1) );
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LS : CONSTANT := 2.0 ** (-(MAX_MANTISSA+1) );
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TYPE ONE_TO_THE_LEFT IS
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TYPE ONE_TO_THE_LEFT IS
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DELTA LS
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DELTA LS
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RANGE -(2.0 ** (-1) ) ..
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RANGE -(2.0 ** (-1) ) ..
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2.0 ** (-1);
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2.0 ** (-1);
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-- THE BINARY POINT IS ONE PLACE TO THE LEFT OF THE
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-- THE BINARY POINT IS ONE PLACE TO THE LEFT OF THE
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-- LARGEST POSSIBLE MANTISSA.
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-- LARGEST POSSIBLE MANTISSA.
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L1, L2 : ONE_TO_THE_LEFT;
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L1, L2 : ONE_TO_THE_LEFT;
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BEGIN
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BEGIN
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L1 := LS;
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L1 := LS;
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FOR I IN POSITIVE RANGE 1 .. MAX_MANTISSA - 1 LOOP
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FOR I IN POSITIVE RANGE 1 .. MAX_MANTISSA - 1 LOOP
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L1 := L1 * IDENT_INT (2);
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L1 := L1 * IDENT_INT (2);
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END LOOP;
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END LOOP;
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L2 := L1 - LS;
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L2 := L1 - LS;
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L2 := L2 + L1;
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L2 := L2 + L1;
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-- AT THIS POINT, L2 SHOULD EQUAL ONE_TO_THE_LEFT'LARGE.
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-- AT THIS POINT, L2 SHOULD EQUAL ONE_TO_THE_LEFT'LARGE.
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L2 := -L2;
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L2 := -L2;
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L2 := L2 + (L1 - LS);
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L2 := L2 + (L1 - LS);
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FOR I IN POSITIVE RANGE 1 .. MAX_MANTISSA - 1 LOOP
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FOR I IN POSITIVE RANGE 1 .. MAX_MANTISSA - 1 LOOP
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L2 := L2 / IDENT_INT (2);
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L2 := L2 / IDENT_INT (2);
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END LOOP;
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END LOOP;
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IF L2 /= -LS THEN
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IF L2 /= -LS THEN
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FAILED ("IDENTITY-PRESERVING OPERATIONS ARE FLAKY - B");
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FAILED ("IDENTITY-PRESERVING OPERATIONS ARE FLAKY - B");
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END IF;
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END IF;
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EXCEPTION
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EXCEPTION
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WHEN OTHERS =>
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WHEN OTHERS =>
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FAILED ("EXCEPTION RAISED - B");
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FAILED ("EXCEPTION RAISED - B");
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END B;
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END B;
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RESULT;
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RESULT;
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END C35902D;
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END C35902D;
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