1 /* 2 * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @bug 5037596 27 * @summary Verify bitwise conversion works for non-canonical NaN values 28 * @library ../Math 29 * @build DoubleConsts 30 * @run main BitwiseConversion 31 * @author Joseph D. Darcy 32 */ 33 34 package test.java.lang.Double; 35 36 import static java.lang.Double.*; 37 38 import jdk.internal.math.DoubleConsts; 39 40 public class BitwiseConversion { testNanCase(long x)41 static int testNanCase(long x) { 42 int errors = 0; 43 // Strip out sign and exponent bits 44 long y = x & DoubleConsts.SIGNIF_BIT_MASK; 45 46 double values[] = { 47 longBitsToDouble(DoubleConsts.EXP_BIT_MASK | y), 48 longBitsToDouble(DoubleConsts.SIGN_BIT_MASK | DoubleConsts.EXP_BIT_MASK | y) 49 }; 50 51 for(double value: values) { 52 if (!isNaN(value)) { 53 throw new RuntimeException("Invalid input " + y + 54 "yielded non-NaN" + value); 55 } 56 long converted = doubleToLongBits(value); 57 if (converted != 0x7ff8000000000000L) { 58 errors++; 59 System.err.format("Non-canoncial NaN bits returned: %x%n", 60 converted); 61 } 62 } 63 return errors; 64 } 65 main(String... argv)66 public static void main(String... argv) { 67 int errors = 0; 68 69 for (int i = 0; i < DoubleConsts.SIGNIFICAND_WIDTH-1; i++) { 70 errors += testNanCase(1L<<i); 71 } 72 73 if (doubleToLongBits(Double.POSITIVE_INFINITY) 74 != 0x7ff0000000000000L) { 75 errors++; 76 System.err.println("Bad conversion for +infinity."); 77 } 78 79 if (doubleToLongBits(Double.NEGATIVE_INFINITY) 80 != 0xfff0000000000000L) { 81 errors++; 82 System.err.println("Bad conversion for -infinity."); 83 } 84 85 if (errors > 0) 86 throw new RuntimeException(); 87 } 88 } 89