SUGGESTED FIX

http://prt-web.sfbay.sun.com/net/prt-archiver.sfbay/data/archived_workspaces/main/c2_baseline/2007/20070207172045.never.6512534/workspace/webrevs/webrev-2007.02.08/index.html
                                     

SUGGESTED FIX

*** /tmp/geta22905      Tue Jan 16 13:53:53 2007
--- c1_LIRGenerator.cpp Tue Jan 16 13:53:51 2007
***************
*** 136,144 ****
      assert(node == NULL || node->operand() == opr, "");
      if (node == NULL) {
        node = new ResolveNode(opr);
-       if (source) virtual_operands().append(node);
        vreg_table()[vreg_num] = node;
      }
    } else {
      assert(source, "");
      node = new ResolveNode(opr);
--- 136,148 ----
      assert(node == NULL || node->operand() == opr, "");
      if (node == NULL) {
        node = new ResolveNode(opr);
        vreg_table()[vreg_num] = node;
      }
+     // Make sure that all virtual operands show up in the list when
+     // they are used as the source of a move.
+     if (source && !virtual_operands().contains(node)) {
+       virtual_operands().append(node);
+     }
    } else {
      assert(source, "");
      node = new ResolveNode(opr);
                                     

EVALUATION

This appears to be a problem with the processing of phis.  I'm still trying to identify what's going wrong.  Here's a simplified test case.

public class Test1 {

    static int dummy;

    private static void error() {
        throw new InternalError("");
    }
    private static void ok() {
        System.out.println("true");
    }

    protected static void doSomething() {
        boolean brk = true;
        boolean pre = false;

        for(int i = 0; i < 2; ++i){
            int j = 0;

            while(j < 1){
                ++j;
                if(i == 0){
                    pre = brk;
                    brk = false;
                    continue;
                }
                if (pre == false) error();
            }
        }

        for (int i = 0; i < 1000; ++i);
    }

    public static void main(String[] args) {
        for(int i = 0; i < 5; i++){
            doSomething();
            // System.out.println((i+1) + " ----------------------");
        }
    }

}