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From "Tim Ellison (JIRA)" <j...@apache.org>
Subject [jira] Closed: (HARMONY-1996) [classlib][math]BigInteger bitwise operations work incorrectly for negative values
Date Fri, 03 Nov 2006 17:15:18 GMT
     [ http://issues.apache.org/jira/browse/HARMONY-1996?page=all ]

Tim Ellison closed HARMONY-1996.
--------------------------------


Verified by Daniel.


> [classlib][math]BigInteger bitwise operations work incorrectly for negative values
> ----------------------------------------------------------------------------------
>
>                 Key: HARMONY-1996
>                 URL: http://issues.apache.org/jira/browse/HARMONY-1996
>             Project: Harmony
>          Issue Type: Bug
>          Components: Classlib
>            Reporter: tatyana doubtsova
>         Assigned To: Tim Ellison
>         Attachments: orPatch.diff
>
>
> It seems that after applying patch for http://issues.apache.org/jira/browse/HARMONY-1636
> BigInteger bitwise operations work incorrectly.
> Code for reproducing:
> import java.math.*;
> public class Test2 {
> 	
>     public static void main(String[] args) {
>     BigInteger x = new BigInteger("-1023");
>     
>     BigInteger r1 =  x.and((BigInteger.ZERO.not()).shiftLeft(32));
>     BigInteger r3 =  x.and((BigInteger.ZERO.not().shiftLeft(32) ).not());
>     
>     System.out.println("r1 = " + r1);
>     System.out.println("r3 = " + r3);
>             
>     BigInteger result = r1.or(r3);
>     System.out.println("result = " + result);
>     }    
> }
> ===================
> Apache Harmony Launcher : (c) Copyright 1991, 2006 The Apache Software Foundation or
its licensors, as applicable.
> java version "1.5.0" 
> pre-alpha : not complete or compatible
> svn = r468686, (Oct 29 2006), Linux/ia32/gcc 3.3.3, release build
> http://incubator.apache.org/harmony
> r1 = -4294967296
> r3 = 4294966273
> result = -4294968319
>  
> Output on SUN jdk
> ===================
> java version "1.5.0_06"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
> Java HotSpot(TM) Server VM (build 1.5.0_06-b05, mixed mode)
>  
> r1 = -4294967296
> r3 = 4294966273
> result = -1023
> If I roll back http://issues.apache.org/jira/browse/HARMONY-1636, bitwise operations
work correctly.

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