| /* |
| * Copyright (c) 2003, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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. |
| */ |
| |
| package sun.misc; |
| |
| /** |
| * This class contains additional constants documenting limits of the |
| * <code>double</code> type. |
| * |
| * @author Joseph D. Darcy |
| */ |
| |
| public class DoubleConsts { |
| /** |
| * Don't let anyone instantiate this class. |
| */ |
| private DoubleConsts() {} |
| |
| public static final double POSITIVE_INFINITY = java.lang.Double.POSITIVE_INFINITY; |
| public static final double NEGATIVE_INFINITY = java.lang.Double.NEGATIVE_INFINITY; |
| public static final double NaN = java.lang.Double.NaN; |
| public static final double MAX_VALUE = java.lang.Double.MAX_VALUE; |
| public static final double MIN_VALUE = java.lang.Double.MIN_VALUE; |
| |
| /** |
| * A constant holding the smallest positive normal value of type |
| * <code>double</code>, 2<sup>-1022</sup>. It is equal to the |
| * value returned by |
| * <code>Double.longBitsToDouble(0x0010000000000000L)</code>. |
| * |
| * @since 1.5 |
| */ |
| public static final double MIN_NORMAL = 2.2250738585072014E-308; |
| |
| |
| /** |
| * The number of logical bits in the significand of a |
| * <code>double</code> number, including the implicit bit. |
| */ |
| public static final int SIGNIFICAND_WIDTH = 53; |
| |
| /** |
| * Maximum exponent a finite <code>double</code> number may have. |
| * It is equal to the value returned by |
| * <code>Math.ilogb(Double.MAX_VALUE)</code>. |
| */ |
| public static final int MAX_EXPONENT = 1023; |
| |
| /** |
| * Minimum exponent a normalized <code>double</code> number may |
| * have. It is equal to the value returned by |
| * <code>Math.ilogb(Double.MIN_NORMAL)</code>. |
| */ |
| public static final int MIN_EXPONENT = -1022; |
| |
| /** |
| * The exponent the smallest positive <code>double</code> |
| * subnormal value would have if it could be normalized. It is |
| * equal to the value returned by |
| * <code>FpUtils.ilogb(Double.MIN_VALUE)</code>. |
| */ |
| public static final int MIN_SUB_EXPONENT = MIN_EXPONENT - |
| (SIGNIFICAND_WIDTH - 1); |
| |
| /** |
| * Bias used in representing a <code>double</code> exponent. |
| */ |
| public static final int EXP_BIAS = 1023; |
| |
| /** |
| * Bit mask to isolate the sign bit of a <code>double</code>. |
| */ |
| public static final long SIGN_BIT_MASK = 0x8000000000000000L; |
| |
| /** |
| * Bit mask to isolate the exponent field of a |
| * <code>double</code>. |
| */ |
| public static final long EXP_BIT_MASK = 0x7FF0000000000000L; |
| |
| /** |
| * Bit mask to isolate the significand field of a |
| * <code>double</code>. |
| */ |
| public static final long SIGNIF_BIT_MASK = 0x000FFFFFFFFFFFFFL; |
| |
| static { |
| // verify bit masks cover all bit positions and that the bit |
| // masks are non-overlapping |
| assert(((SIGN_BIT_MASK | EXP_BIT_MASK | SIGNIF_BIT_MASK) == ~0L) && |
| (((SIGN_BIT_MASK & EXP_BIT_MASK) == 0L) && |
| ((SIGN_BIT_MASK & SIGNIF_BIT_MASK) == 0L) && |
| ((EXP_BIT_MASK & SIGNIF_BIT_MASK) == 0L))); |
| } |
| } |