73 lines
2.7 KiB
Java
73 lines
2.7 KiB
Java
/*
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* Copyright (c) 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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package compiler.intrinsics;
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import java.util.random.RandomGenerator;
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import java.util.random.RandomGeneratorFactory;
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public class TestDoubleClassCheck {
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RandomGenerator rng;
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int BUFFER_SIZE = 1024;
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double[] inputs;
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boolean[] outputs;
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public TestDoubleClassCheck() {
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outputs = new boolean[BUFFER_SIZE];
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inputs = new double[BUFFER_SIZE];
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RandomGenerator rng = RandomGeneratorFactory.getDefault().create(0);
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double input;
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for (int i = 0; i < BUFFER_SIZE; i++) {
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if (i % 5 == 0) {
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input = (i%2 == 0) ? Double.NEGATIVE_INFINITY : Double.POSITIVE_INFINITY;
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}
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else if (i % 3 == 0) input = Double.NaN;
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else input = rng.nextDouble();
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inputs[i] = input;
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}
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}
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public void checkResult(String method) {
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for (int i=0; i < BUFFER_SIZE; i++) {
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boolean expected = doubleClassCheck(inputs[i], method);
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if (expected != outputs[i]) {
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String errorMsg = "Correctness check failed for Double." + method +
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"() for input = " + inputs[i];
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throw new RuntimeException(errorMsg);
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}
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}
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}
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public boolean doubleClassCheck(double f, String method) {
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long infBits = Double.doubleToRawLongBits(Double.POSITIVE_INFINITY);
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long bits = Double.doubleToRawLongBits(f);
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bits = bits & Long.MAX_VALUE;
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switch (method) {
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case "isFinite": return (bits < infBits);
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case "isInfinite": return (bits == infBits);
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case "isNaN": return (bits > infBits);
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default: throw new IllegalArgumentException("incorrect method for Double");
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}
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}
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}
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