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 * @author Joseph D. Darcy 29 */ 30 31 import static java.lang.Double.*; 32 import static sun.misc.DoubleConsts.*; 33 34 public class BitwiseConversion { 35 static int testNanCase(long x) { 36 int errors = 0; 37 // Strip out sign and exponent bits 38 long y = x & SIGNIF_BIT_MASK; 39 40 double values[] = { 41 longBitsToDouble(EXP_BIT_MASK | y), 42 longBitsToDouble(SIGN_BIT_MASK | EXP_BIT_MASK | y) 43 }; 44 45 for(double value: values) { 46 if (!isNaN(value)) { 47 throw new RuntimeException("Invalid input " + y + 48 "yielded non-NaN" + value); 49 } 50 long converted = doubleToLongBits(value); 51 if (converted != 0x7ff8000000000000L) { 52 errors++; 53 System.err.format("Non-canoncial NaN bits returned: %x%n", 54 converted); 55 } 56 } 57 return errors; 58 } 59 60 public static void main(String... argv) { 61 int errors = 0; 62 63 for (int i = 0; i < SIGNIFICAND_WIDTH-1; i++) { 64 errors += testNanCase(1L<<i); 65 } 66 67 if (doubleToLongBits(Double.POSITIVE_INFINITY) 68 != 0x7ff0000000000000L) { 69 errors++; 70 System.err.println("Bad conversion for +infinity."); 71 } 72 73 if (doubleToLongBits(Double.NEGATIVE_INFINITY) 74 != 0xfff0000000000000L) { 75 errors++; 76 System.err.println("Bad conversion for -infinity."); 77 } 78 79 if (errors > 0) 80 throw new RuntimeException(); 81 } 82 }