Name: tb29552 Date: 11/02/2000


/*
java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0)
Java HotSpot(TM) Client VM (build 1.3.0, mixed mode)

Simple arithmetic on primitive longs returns an incorrect
value. So far, we have only seen this is a set of loops on
primitive longs running with HotSpot. The bug does not occur
in 1.2.2, previous versions of Java, or in 1.3.0 with the
interpreter.

The class below shows the error when run on the 1.3.0 JVM
with HotSpot on Solaris 6 or Solaris 8. I haven't tried
Solaris 7.

The bug is that the variable "k" gets an incorrect result
for "k++" at one point in the loop. So far as I can tell,
all five loops need to be present for the bug to
occur. Removing the loops that are OUTSIDE or AFTER the loop
on "k" causes the bug to *appear* to vanish, suggesting this
is a peephole optimization error in HotSpot.

The println() statements display the variables starting
shortly before the error occurs. When i==0 and j==166 and
k==135, k++ yields 455572 instead of 136.


-----------------------------------------------------------
*/
public class Crashes130SolarisWithHotSpot {
    public static void main(String[] argv)
    {
        System.out.println("First Loop");
        for (long i = 0; i < 1; i++)
        {
            for (long j = 1; j < 192 - i; j++)
            {
                Object o = new Object();
                for (long k = i; k < i + j; k++)
                {
                    if (i == 0 && j == 166 && k > 120)
                        System.out.println("i=" + i + ", j=" + j + ", k=" + k);
                    if (k > 192)
                    {
                        System.out.println("BUG!!!");
                        System.exit(-1);
                    }
                }
            }
        }

        System.out.println("Second Loop");
        for (long i = 0; i < 1; i++)
        {
            for (long j = 0; j < 1; j++)
            {
                Object o = new Object();
            }
        }
        System.out.println("Success!!");
    }
}

(Review ID: 111729)
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