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/*
* 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.");
}
}
}
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