8015585: Missing regression test for 8011771

Summary: missing regression test
Reviewed-by: kvn

test/compiler/8011771/Test8011771.java

+/*
+ * Copyright (c) 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 8011771
+ * @summary Array bound check elimination's in block motion doesn't always reset its data structures from one step to the other.
+ * @run main/othervm -XX:-BackgroundCompilation Test8011771
+ *
+ */
+
+public class Test8011771 {
+
+    static void m(int[] a, int[] b, int j) {
+        // Array bound check elimination inserts a predicate before
+        // the loop. We'll have the predicate fail, so the method is
+        // recompiled without optimistic optimizations
+        for (int i = 0; i < 10; i++) {
+            a[i] = i;
+        }
+
+        // The test itself
+        a[j] = 0;
+        a[j+5] = 0;
+        b[j+4] = 0; // this range check shouldn't be eliminated
+    }
+
+    static public void main(String[] args) {
+        int[] arr1 = new int[10], arr2 = new int[10];
+        // force compilation:
+        for (int i = 0; i < 5000; i++) {
+            m(arr1, arr2, 0);
+        }
+
+        try {
+            m(new int[1], null, 0); // force predicate failure
+        } catch(ArrayIndexOutOfBoundsException e) {}
+
+        // force compilation again (no optimistic opts):
+        for (int i = 0; i < 5000; i++) {
+            m(arr1, arr2, 0);
+        }
+
+        // Check that the range check  on the second array wasn't optimized out
+        boolean success = false;
+        try {
+            m(arr1, new int[1], 0);
+        } catch(ArrayIndexOutOfBoundsException e) {
+            success = true;
+        }
+        if (success) {
+            System.out.println("TEST PASSED");
+        } else {
+            throw new RuntimeException("TEST FAILED: erroneous bound check elimination");
+        }
+    }
+}