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From "Mikhail Fursov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-2396) [drlvm][jit] Jitrino fails to run SpecJBB2005 in -Xem:opt mode
Date Fri, 01 Dec 2006 15:26:21 GMT
[drlvm][jit] Jitrino fails to run SpecJBB2005 in -Xem:opt mode
--------------------------------------------------------------

                 Key: HARMONY-2396
                 URL: http://issues.apache.org/jira/browse/HARMONY-2396
             Project: Harmony
          Issue Type: Bug
          Components: DRLVM
            Reporter: Mikhail Fursov


SpecJBB2005 crashes in -Xem:opt mode.
After analysis of IR I prepared this minimized testcase to reproduce the problem:

public class Test {
    public static void main(String[] args) {
        foo3(new Test(), 10, new char[100]);
    }
    
    int position;
    static void foo3 (Test x, int i, char[] arr) {
        int j=x.position;
        if(j < i) {
            System.arraycopy(arr, j, arr, i, 10);
        }
    }
}

The problem is in memopt: it produces code with tau opnds mixed with numerics at in the same
insts:
The part of IR before memopt:

  I42:cgt:i4  t3, t9 -) t22:int32
  I43:and     t18, t22 -) t23:int32


The part of IR after memopt:

  I125:copy     t55 -) t22:int32
   I43:and      t18, t22 -) t23:int32

Where t55 is
  I118:tauedge() -) t55:tau


I propose replacing I125 copy inst with ldconst #1 for tauedge insts in HVN pass to solve
the problem.


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