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 import static java.lang.Double.*; 35 36 public class BitwiseConversion { 37 static int testNanCase(long x) { 38 int errors = 0; 39 // Strip out sign and exponent bits 40 long y = x & DoubleConsts.SIGNIF_BIT_MASK; 41 42 double values[] = { 43 longBitsToDouble(DoubleConsts.EXP_BIT_MASK | y), 44 longBitsToDouble(DoubleConsts.SIGN_BIT_MASK | DoubleConsts.EXP_BIT_MASK | y) 45 }; 46 47 for(double value: values) { 48 if (!isNaN(value)) { 49 throw new RuntimeException("Invalid input " + y + 50 "yielded non-NaN" + value); 51 } 52 long converted = doubleToLongBits(value); 53 if (converted != 0x7ff8000000000000L) { 54 errors++; 55 System.err.format("Non-canoncial NaN bits returned: %x%n", 56 converted); 57 } 58 } 59 return errors; 60 } 61 62 public static void main(String... argv) { 63 int errors = 0; 64 65 for (int i = 0; i < DoubleConsts.SIGNIFICAND_WIDTH-1; i++) { 66 errors += testNanCase(1L<<i); 67 } 68 69 if (doubleToLongBits(Double.POSITIVE_INFINITY) 70 != 0x7ff0000000000000L) { 71 errors++; 72 System.err.println("Bad conversion for +infinity."); 73 } 74 75 if (doubleToLongBits(Double.NEGATIVE_INFINITY) 76 != 0xfff0000000000000L) { 77 errors++; 78 System.err.println("Bad conversion for -infinity."); 79 } 80 81 if (errors > 0) 82 throw new RuntimeException(); 83 } 84 }