jdk-24/test/hotspot/jtreg/compiler/intrinsics/TestDoubleClassCheck.java
Aleksei Voitylov aeef3ecdc4 8294198: Implement isFinite intrinsic for RISC-V
Reviewed-by: fyang, kvn
2022-09-29 18:51:38 +00:00

73 lines
2.7 KiB
Java

/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* under the terms of the GNU General Public License version 2 only, as
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*
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* version 2 for more details (a copy is included in the LICENSE file that
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*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package compiler.intrinsics;
import java.util.random.RandomGenerator;
import java.util.random.RandomGeneratorFactory;
public class TestDoubleClassCheck {
RandomGenerator rng;
int BUFFER_SIZE = 1024;
double[] inputs;
boolean[] outputs;
public TestDoubleClassCheck() {
outputs = new boolean[BUFFER_SIZE];
inputs = new double[BUFFER_SIZE];
RandomGenerator rng = RandomGeneratorFactory.getDefault().create(0);
double input;
for (int i = 0; i < BUFFER_SIZE; i++) {
if (i % 5 == 0) {
input = (i%2 == 0) ? Double.NEGATIVE_INFINITY : Double.POSITIVE_INFINITY;
}
else if (i % 3 == 0) input = Double.NaN;
else input = rng.nextDouble();
inputs[i] = input;
}
}
public void checkResult(String method) {
for (int i=0; i < BUFFER_SIZE; i++) {
boolean expected = doubleClassCheck(inputs[i], method);
if (expected != outputs[i]) {
String errorMsg = "Correctness check failed for Double." + method +
"() for input = " + inputs[i];
throw new RuntimeException(errorMsg);
}
}
}
public boolean doubleClassCheck(double f, String method) {
long infBits = Double.doubleToRawLongBits(Double.POSITIVE_INFINITY);
long bits = Double.doubleToRawLongBits(f);
bits = bits & Long.MAX_VALUE;
switch (method) {
case "isFinite": return (bits < infBits);
case "isInfinite": return (bits == infBits);
case "isNaN": return (bits > infBits);
default: throw new IllegalArgumentException("incorrect method for Double");
}
}
}