75 lines
2.6 KiB
Java
75 lines
2.6 KiB
Java
/*
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* Copyright (c) 2014, 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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* Common library for additional constants of the {@code double} type.
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*/
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public final class DoubleConsts {
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/**
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* Don't let anyone instantiate this class.
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*/
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private DoubleConsts() {}
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/**
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* Bias used in representing a {@code double} exponent.
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*/
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public static final int EXP_BIAS = 1023;
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/**
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* Bit mask to isolate the exponent field of a {@code double}.
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*/
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public static final long EXP_BIT_MASK = 0x7FF0000000000000L;
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/**
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* Bit mask to isolate the sign bit of a {@code double}.
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*/
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public static final long SIGN_BIT_MASK = 0x8000000000000000L;
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/**
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* Bit mask to isolate the significand field of a {@code double}.
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*/
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public static final long SIGNIF_BIT_MASK = 0x000FFFFFFFFFFFFFL;
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/**
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* The number of logical bits in the significand of a
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* {@code double} number, including the implicit bit.
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*/
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public static final int SIGNIFICAND_WIDTH = 53;
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/**
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* The exponent the smallest positive {@code double}
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* subnormal value would have if it could be normalized.
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*/
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public static final int MIN_SUB_EXPONENT = Double.MIN_EXPONENT -
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(SIGNIFICAND_WIDTH - 1);
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static {
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// verify bit masks cover all bit positions and that the bit
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// masks are non-overlapping
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assert(((SIGN_BIT_MASK | EXP_BIT_MASK | SIGNIF_BIT_MASK) == ~0L) &&
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(((SIGN_BIT_MASK & EXP_BIT_MASK) == 0L) &&
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((SIGN_BIT_MASK & SIGNIF_BIT_MASK) == 0L) &&
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((EXP_BIT_MASK & SIGNIF_BIT_MASK) == 0L)));
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}
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}
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