diff test/compiler/5091921/Test6992759.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
parents
children 514efad5e81a
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/compiler/5091921/Test6992759.java	Wed May 04 13:12:42 2011 -0700
@@ -0,0 +1,66 @@
+/*
+ * 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 6992759
+ * @summary Bad code generated for integer <= comparison, fails for Integer.MAX_VALUE
+ *
+ * @run main Test6992759
+ */
+
+public class Test6992759 {
+
+    static final int N_TESTS = 1000000000;
+
+    public static void main(String[] args) throws Exception {
+
+        /*
+         * If MAX_VALUE is changed to MAX_VALUE - 1 below, the test passes
+         * because (apparently) bad code is only generated when comparing
+         * <= MAX_VALUE in the doTest method.
+         */
+        Test6992759 test = new Test6992759();
+        for (int i = 0; i < N_TESTS; i += 1) {
+            test.doTest(10, Integer.MAX_VALUE, i);
+            //test.doTest(10, Integer.MAX_VALUE - 1, i);
+        }
+        System.out.println("No failure");
+    }
+
+    void doTest(int expected, int max, int i) {
+        int counted;
+        for (counted = 0;
+             (counted <= max) && (counted < expected);
+             counted += 1) {
+        }
+        if (counted != expected) {
+            throw new RuntimeException("Failed test iteration=" + i +
+                                       " max=" + max +
+                                       " counted=" + counted +
+                                       " expected=" + expected);
+        }
+    }
+}
+