85 lines
2.8 KiB
Java
85 lines
2.8 KiB
Java
/*
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* Copyright (c) 2005, 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 5037596
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* @summary Verify bitwise conversion works for non-canonical NaN values
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* @library ../Math
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* @build DoubleConsts
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* @run main BitwiseConversion
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* @author Joseph D. Darcy
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*/
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import static java.lang.Double.*;
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public class BitwiseConversion {
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static int testNanCase(long x) {
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int errors = 0;
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// Strip out sign and exponent bits
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long y = x & DoubleConsts.SIGNIF_BIT_MASK;
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double values[] = {
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longBitsToDouble(DoubleConsts.EXP_BIT_MASK | y),
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longBitsToDouble(DoubleConsts.SIGN_BIT_MASK | DoubleConsts.EXP_BIT_MASK | y)
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};
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for(double value: values) {
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if (!isNaN(value)) {
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throw new RuntimeException("Invalid input " + y +
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"yielded non-NaN" + value);
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}
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long converted = doubleToLongBits(value);
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if (converted != 0x7ff8000000000000L) {
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errors++;
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System.err.format("Non-canoncial NaN bits returned: %x%n",
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converted);
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}
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}
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return errors;
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}
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public static void main(String... argv) {
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int errors = 0;
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for (int i = 0; i < DoubleConsts.SIGNIFICAND_WIDTH-1; i++) {
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errors += testNanCase(1L<<i);
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}
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if (doubleToLongBits(Double.POSITIVE_INFINITY)
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!= 0x7ff0000000000000L) {
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errors++;
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System.err.println("Bad conversion for +infinity.");
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}
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if (doubleToLongBits(Double.NEGATIVE_INFINITY)
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!= 0xfff0000000000000L) {
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errors++;
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System.err.println("Bad conversion for -infinity.");
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}
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if (errors > 0)
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throw new RuntimeException();
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}
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}
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