diff -r 000000000000 -r f90c822e73f8 test/compiler/5091921/Test6905845.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/compiler/5091921/Test6905845.java	Wed Apr 27 01:25:04 2016 +0800
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2011, 2013, 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 6905845
+ * @summary Server VM improperly optimizing away loop.
+ *
+ * @run main/timeout=480 Test6905845
+ */
+
+public class Test6905845 {
+
+   public static void main(String[] args){
+      for (int asdf = 0; asdf < 5; asdf++){
+         //test block
+         {
+            StringBuilder strBuf1 = new StringBuilder(65);
+            long          start   = System.currentTimeMillis();
+            int           count   = 0;
+
+            for (int i = Integer.MIN_VALUE; i < (Integer.MAX_VALUE - 80); i += 79){
+               strBuf1.append(i);
+               count++;
+               strBuf1.delete(0, 65);
+            }
+
+            System.out.println(count);
+            if (count != 54366674) {
+              System.out.println("wrong count: " + count +", should be 54366674");
+              System.exit(97);
+            }
+         }
+         //test block
+         {
+            StringBuilder strBuf1 = new StringBuilder(65);
+            long          start   = System.currentTimeMillis();
+            int           count   = 0;
+
+            for (int i = Integer.MIN_VALUE; i < (Integer.MAX_VALUE - 80); i += 79){
+               strBuf1.append(i);
+               count++;
+               strBuf1.delete(0, 65);
+            }
+
+            System.out.println(count);
+            if (count != 54366674) {
+              System.out.println("wrong count: " + count +", should be 54366674");
+              System.exit(97);
+            }
+         }
+      }
+   }
+}
+