| /* |
| * Copyright (c) 2015, 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 8076373 |
| * @summary Verify if signaling NaNs are preserved. |
| * @library /test/lib / |
| * |
| * @build sun.hotspot.WhiteBox |
| * @run driver ClassFileInstaller sun.hotspot.WhiteBox |
| * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI |
| * compiler.floatingpoint.NaNTest |
| */ |
| |
| package compiler.floatingpoint; |
| |
| import jdk.test.lib.Platform; |
| import jtreg.SkippedException; |
| import sun.hotspot.WhiteBox; |
| |
| public class NaNTest { |
| static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox(); |
| |
| static void testFloat() { |
| int originalValue = 0x7f800001; |
| int readBackValue = Float.floatToRawIntBits(Float.intBitsToFloat(originalValue)); |
| if (originalValue != readBackValue) { |
| String errorMessage = String.format("Original and read back float values mismatch\n0x%X 0x%X\n", |
| originalValue, |
| readBackValue); |
| throw new RuntimeException(errorMessage); |
| } else { |
| System.out.printf("Written and read back float values match\n0x%X 0x%X\n", |
| originalValue, |
| readBackValue); |
| } |
| } |
| |
| static void testDouble() { |
| long originalValue = 0xFFF0000000000001L; |
| long readBackValue = Double.doubleToRawLongBits(Double.longBitsToDouble(originalValue)); |
| if (originalValue != readBackValue) { |
| String errorMessage = String.format("Original and read back double values mismatch\n0x%X 0x%X\n", |
| originalValue, |
| readBackValue); |
| throw new RuntimeException(errorMessage); |
| } else { |
| System.out.printf("Written and read back double values match\n0x%X 0x%X\n", |
| originalValue, |
| readBackValue); |
| } |
| |
| } |
| |
| public static void main(String args[]) { |
| // Some platforms are known to strip signaling NaNs. |
| // The block below can be used to except them. |
| boolean expectStableFloats = true; |
| boolean expectStableDoubles = true; |
| |
| // On x86_32 without relevant SSE-enabled stubs, we are entering |
| // native methods that use FPU instructions, and those strip the |
| // signaling NaNs. |
| if (Platform.isX86()) { |
| int sse = WHITE_BOX.getIntxVMFlag("UseSSE").intValue(); |
| expectStableFloats = (sse >= 1); |
| expectStableDoubles = (sse >= 2); |
| } |
| |
| if (expectStableFloats) { |
| testFloat(); |
| } else { |
| System.out.println("Stable floats cannot be expected, skipping"); |
| } |
| |
| if (expectStableDoubles) { |
| testDouble(); |
| } else { |
| System.out.println("Stable doubles cannot be expected, skipping"); |
| } |
| |
| if (!expectStableFloats && !expectStableDoubles) { |
| throw new SkippedException("No tests were run."); |
| } |
| } |
| } |