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8055852: Add test/java/lang/Math/DoubleConsts.java and FloatConsts.java

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Reviewed-by: mchung, darcy
This commit is contained in:
Amy Lu 2014-08-22 18:54:20 -07:00 committed by Mandy Chung
parent ff93fd2cce
commit 10489a3c6c
2 changed files with 148 additions and 0 deletions
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74
jdk/test/java/lang/Math/DoubleConsts.java Normal file
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/*
* Copyright (c) 2014, 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.
*
* 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.
*/
/**
* Common library for additional constants of the {@code double} type.
*/
public final class DoubleConsts {
/**
* Don't let anyone instantiate this class.
*/
private DoubleConsts() {}
/**
* Bias used in representing a {@code double} exponent.
*/
public static final int EXP_BIAS = 1023;
/**
* Bit mask to isolate the exponent field of a {@code double}.
*/
public static final long EXP_BIT_MASK = 0x7FF0000000000000L;
/**
* Bit mask to isolate the sign bit of a {@code double}.
*/
public static final long SIGN_BIT_MASK = 0x8000000000000000L;
/**
* Bit mask to isolate the significand field of a {@code double}.
*/
public static final long SIGNIF_BIT_MASK = 0x000FFFFFFFFFFFFFL;
/**
* The number of logical bits in the significand of a
* {@code double} number, including the implicit bit.
*/
public static final int SIGNIFICAND_WIDTH = 53;
/**
* The exponent the smallest positive {@code double}
* subnormal value would have if it could be normalized.
*/
public static final int MIN_SUB_EXPONENT = Double.MIN_EXPONENT -
(SIGNIFICAND_WIDTH - 1);
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)));
}
}

74
jdk/test/java/lang/Math/FloatConsts.java Normal file
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/*
* Copyright (c) 2014, 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.
*
* 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.
*/
/**
* Common library for additional constants of the {@code float} type.
*/
public final class FloatConsts {
/**
* Don't let anyone instantiate this class.
*/
private FloatConsts() {}
/**
* Bias used in representing a {@code float} exponent.
*/
public static final int EXP_BIAS = 127;
/**
* Bit mask to isolate the exponent field of a {@code float}.
*/
public static final int EXP_BIT_MASK = 0x7F800000;
/**
* Bit mask to isolate the sign bit of a {@code float}.
*/
public static final int SIGN_BIT_MASK = 0x80000000;
/**
* Bit mask to isolate the significand field of a {@code float}.
*/
public static final int SIGNIF_BIT_MASK = 0x007FFFFF;
/**
* The number of logical bits in the significand of a
* {@code float} number, including the implicit bit.
*/
public static final int SIGNIFICAND_WIDTH = 24;
/**
* The exponent the smallest positive {@code float} subnormal
* value would have if it could be normalized.
*/
public static final int MIN_SUB_EXPONENT = Float.MIN_EXPONENT -
(SIGNIFICAND_WIDTH - 1);
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) == ~0) &&
(((SIGN_BIT_MASK & EXP_BIT_MASK) == 0) &&
((SIGN_BIT_MASK & SIGNIF_BIT_MASK) == 0) &&
((EXP_BIT_MASK & SIGNIF_BIT_MASK) == 0)));
}
}