diff test/compiler/5091921/Test6935022.java @ 3345:bad7ecd0b6ed

5091921: Sign flip issues in loop optimizer Summary: Fix integer overflow problem in the code generated by loop optimizer. Reviewed-by: never
author kvn
date Wed, 04 May 2011 13:12:42 -0700
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/compiler/5091921/Test6935022.java	Wed May 04 13:12:42 2011 -0700
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+/**
+ * @test
+ * @bug 6935022
+ * @summary Server VM incorrectly breaks out of while loop
+ *
+ * @run main Test6935022
+ */
+
+public class Test6935022 {
+    public static final void main(String[] args) throws Exception {
+        Test6935022 test = new Test6935022();
+
+        int cnt = 0;
+
+        while (cnt < 10000) {
+            try {
+                ++cnt;
+                if ((cnt&1023) == 0)
+                  System.out.println("Thread="+Thread.currentThread().getName() + " iteration: " + cnt);
+                test.loop(2147483647, (cnt&1023));
+            }
+
+            catch (Exception e) {
+                System.out.println("Caught on iteration " + cnt);
+                e.printStackTrace();
+                System.exit(97);
+            }
+        }
+    }
+
+    private void loop(int endingRow, int mask) throws Exception {
+        int rows = 1;
+        boolean next = true;
+
+        while(rows <= endingRow && next) {
+            rows++;
+            if (rows == mask)
+              System.out.println("Rows="+rows+", end="+endingRow+", next="+next);
+            next = next(rows);
+        }
+
+        if (next)
+            throw new Exception("Ended on rows(no rs): " + rows);
+    }
+
+    private boolean next(int rows) {
+        return rows < 12;
+    }
+}
+