[Sablevm-bugs] [ sablevm-Bugs-607368 ] bug in >>> operator?

[<no...@so...>]

Bugs item #607368, was opened at 2002-09-10 11:48
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105523&aid=607368&group_id=5523

Category: Execution Problem
Group: SableVM
Status: Closed
Resolution: Fixed
Priority: 7
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Etienne M. Gagnon (egagnon)
Summary: bug in >>> operator?

Initial Comment:
I'm using the 1.0.3 version of sablevm, and it's
associated classpath.

The >>>= and >>> operators appear to be broken
strangely.  Demo class and output:

===================================================
import java.lang.*;
import java.awt.color.*;
import java.awt.image.*;

public class ShiftBug {
    public static void main (String argv[]) 
    {
        long a = 0xff00;
        long b, c;

        b = a >>> 4;
        c = 0xff00 >>> 4;
        System.out.print (Long.toString(b,16) + " " +
Long.toString(c,16) + "\n");
    }
}
===================================================

Output:

[esnyder@basalt esnyder]$ jikes -classpath
/usr/local/lib/sablevm/classes-1.0.3 ShiftBug.java
[esnyder@basalt esnyder]$ sablevm -Y ShiftBug
ff000 ff0

thanks,
-emile


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>Comment By: Etienne M. Gagnon (egagnon)
Date: 2002-09-10 13:40

Message:
Logged In: YES 
user_id=15365

Fixed in CVS.

Thanks!

- Etienne

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

Comment By: Nobody/Anonymous (nobody)
Date: 2002-09-10 12:56

Message:
Logged In: NO 

I believe it's just a typo in
sablevm-1.0.3/src/libsablevm/instructions.m4.c

If I change line 1477 (in the LUSR block) from

          *((jlong *) &stack[stack_size - 2]) =
            ((_svmt_u64) value1) << (value2 & 0x3f);    
<---- line 1477

to

          *((jlong *) &stack[stack_size - 2]) =
            ((_svmt_u64) value1) >> (value2 & 0x3f);    
<---- line 1477

Then the test program works correctly.

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

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105523&aid=607368&group_id=5523