Merge

hotspot/test/compiler/floatingpoint/TestRound.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2002, 2017, 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 4755500
+ * @summary calling Math.round(NaN) can break subsequent calls to Math.round()
+ * @run main compiler.floatingpoint.TestRound
+ */
+
+package compiler.floatingpoint;
+
+public class TestRound {
+    public static void main(String[] args) {
+        // Note: it's really only necessary to run this loop 8 times to
+        // reproduce the bug, but the 10000-length loop causes compilation
+        // of Math.round() without any other command-line flags.
+        // A bug in the d2l NaN case was causing overflow of the FPU
+        // stack, yielding subsequent wrong results for flds.
+        for (int i = 0; i < 10_000; i++) {
+            Math.round(Double.NaN);
+        }
+        if (Math.round(1d) != 1) {
+            throw new AssertionError("TEST FAILED");
+        }
+        System.out.println("Test passed.");
+    }
+}
+