--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/math/BigInteger/PrimitiveConversionTests.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 1998, 2013, 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.
+ */
+
+import static java.math.BigInteger.ONE;
+
+import java.math.BigInteger;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Random;
+
+/**
+ * @test
+ * @bug 7131192
+ * @summary This test ensures that BigInteger.floatValue() and
+ * BigInteger.doubleValue() behave correctly.
+ * @author Louis Wasserman
+ */
+public class PrimitiveConversionTests {
+ static final List<BigInteger> ALL_BIGINTEGER_CANDIDATES;
+
+ static {
+ List<BigInteger> samples = new ArrayList<>();
+ // Now add values near 2^N for lots of values of N.
+ for (int exponent : Arrays.asList(0, 1, 2, 3, 4, 5, 6, 7, 31, 32, 33,
+ 34, 62, 63, 64, 65, 71, 72, 73, 79, 80, 81, 255, 256, 257, 511,
+ 512, 513, Double.MAX_EXPONENT - 1, Double.MAX_EXPONENT,
+ Double.MAX_EXPONENT + 1, 2000, 2001, 2002)) {
+ BigInteger x = ONE.shiftLeft(exponent);
+ for (BigInteger y : Arrays.asList(x, x.add(ONE), x.subtract(ONE))) {
+ samples.add(y);
+ samples.add(y.negate());
+ }
+ }
+
+ Random rng = new Random(1234567);
+ for (int i = 0; i < 2000; i++) {
+ samples.add(new BigInteger(rng.nextInt(2000), rng));
+ }
+
+ ALL_BIGINTEGER_CANDIDATES = Collections.unmodifiableList(samples);
+ }
+
+ public static int testDoubleValue() {
+ int failures = 0;
+ for (BigInteger big : ALL_BIGINTEGER_CANDIDATES) {
+ double expected = Double.parseDouble(big.toString());
+ double actual = big.doubleValue();
+
+ // should be bitwise identical
+ if (Double.doubleToRawLongBits(expected) != Double
+ .doubleToRawLongBits(actual)) {
+ System.out.println(big);
+ failures++;
+ }
+ }
+ return failures;
+ }
+
+ public static int testFloatValue() {
+ int failures = 0;
+ for (BigInteger big : ALL_BIGINTEGER_CANDIDATES) {
+ float expected = Float.parseFloat(big.toString());
+ float actual = big.floatValue();
+
+ // should be bitwise identical
+ if (Float.floatToRawIntBits(expected) != Float
+ .floatToRawIntBits(actual)) {
+ System.out.println(big + " " + expected + " " + actual);
+ failures++;
+ }
+ }
+ return failures;
+ }
+
+ public static void main(String[] args) {
+ int failures = testDoubleValue();
+ failures += testFloatValue();
+ if (failures > 0) {
+ throw new RuntimeException("Incurred " + failures
+ + " failures while testing primitive conversions.");
+ }
+ }
+}