108 lines
4.2 KiB
Java
108 lines
4.2 KiB
Java
/*
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* Copyright (c) 2015, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 8076373
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* @summary Verify if signaling NaNs are preserved.
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* @library /test/lib /
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*
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
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* compiler.floatingpoint.NaNTest
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*/
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package compiler.floatingpoint;
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import jdk.test.lib.Platform;
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import jtreg.SkippedException;
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import jdk.test.whitebox.WhiteBox;
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public class NaNTest {
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static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
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static void testFloat() {
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int originalValue = 0x7f800001;
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int readBackValue = Float.floatToRawIntBits(Float.intBitsToFloat(originalValue));
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if (originalValue != readBackValue) {
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String errorMessage = String.format("Original and read back float values mismatch\n0x%X 0x%X\n",
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originalValue,
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readBackValue);
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throw new RuntimeException(errorMessage);
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} else {
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System.out.printf("Written and read back float values match\n0x%X 0x%X\n",
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originalValue,
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readBackValue);
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}
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}
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static void testDouble() {
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long originalValue = 0xFFF0000000000001L;
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long readBackValue = Double.doubleToRawLongBits(Double.longBitsToDouble(originalValue));
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if (originalValue != readBackValue) {
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String errorMessage = String.format("Original and read back double values mismatch\n0x%X 0x%X\n",
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originalValue,
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readBackValue);
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throw new RuntimeException(errorMessage);
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} else {
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System.out.printf("Written and read back double values match\n0x%X 0x%X\n",
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originalValue,
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readBackValue);
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}
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}
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public static void main(String args[]) {
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// Some platforms are known to strip signaling NaNs.
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// The block below can be used to except them.
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boolean expectStableFloats = true;
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boolean expectStableDoubles = true;
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// On x86_32 without relevant SSE-enabled stubs, we are entering
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// native methods that use FPU instructions, and those strip the
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// signaling NaNs.
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if (Platform.isX86()) {
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int sse = WHITE_BOX.getIntVMFlag("UseSSE").intValue();
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boolean stubsPresent = WHITE_BOX.getBooleanVMFlag("InlineIntrinsics");
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expectStableFloats = (sse >= 1) && stubsPresent;
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expectStableDoubles = (sse >= 2) && stubsPresent;
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}
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if (expectStableFloats) {
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testFloat();
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} else {
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System.out.println("Stable floats cannot be expected, skipping");
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}
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if (expectStableDoubles) {
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testDouble();
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} else {
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System.out.println("Stable doubles cannot be expected, skipping");
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}
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if (!expectStableFloats && !expectStableDoubles) {
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throw new SkippedException("No tests were run.");
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}
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}
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}
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