/* * Copyright (c) 2015, 2022, 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 jdk.test.whitebox.WhiteBox * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.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 jdk.test.whitebox.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.getIntVMFlag("UseSSE").intValue(); boolean stubsPresent = WHITE_BOX.getBooleanVMFlag("InlineIntrinsics"); expectStableFloats = (sse >= 1) && stubsPresent; expectStableDoubles = (sse >= 2) && stubsPresent; } 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."); } } }