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8285477: Add a PRECISION public static field to j.l.Float and j.l.Double

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Reviewed-by: darcy
This commit is contained in:
Raffaello Giulietti 2022-04-25 17:18:46 +00:00 committed by Joe Darcy
parent 1e79ded98a
commit fb605944b5
2 changed files with 38 additions and 20 deletions
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29
src/java.base/share/classes/java/lang/Double.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1994, 2021, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1994, 2022, 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
@ -205,6 +205,22 @@ public final class Double extends Number
*/
public static final double MIN_VALUE = 0x0.0000000000001P-1022; // 4.9e-324
/**
* The number of bits used to represent a {@code double} value.
*
* @since 1.5
*/
public static final int SIZE = 64;
/**
* The number of bits in the significand of a {@code double} value.
* This is the parameter N in section {@jls 4.2.3} of
* <cite>The Java Language Specification</cite>.
*
* @since 19
*/
public static final int PRECISION = 53;
/**
* Maximum exponent a finite {@code double} variable may have.
* It is equal to the value returned by
@ -212,7 +228,7 @@ public final class Double extends Number
*
* @since 1.6
*/
public static final int MAX_EXPONENT = 1023;
public static final int MAX_EXPONENT = (1 << (SIZE - PRECISION - 1)) - 1; // 1023
/**
* Minimum exponent a normalized {@code double} variable may
@ -221,14 +237,7 @@ public final class Double extends Number
*
* @since 1.6
*/
public static final int MIN_EXPONENT = -1022;
/**
* The number of bits used to represent a {@code double} value.
*
* @since 1.5
*/
public static final int SIZE = 64;
public static final int MIN_EXPONENT = 1 - MAX_EXPONENT; // -1022
/**
* The number of bytes used to represent a {@code double} value.

29
src/java.base/share/classes/java/lang/Float.java
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 1994, 2021, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1994, 2022, 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
@ -115,6 +115,22 @@ public final class Float extends Number
*/
public static final float MIN_VALUE = 0x0.000002P-126f; // 1.4e-45f
/**
* The number of bits used to represent a {@code float} value.
*
* @since 1.5
*/
public static final int SIZE = 32;
/**
* The number of bits in the significand of a {@code float} value.
* This is the parameter N in section {@jls 4.2.3} of
* <cite>The Java Language Specification</cite>.
*
* @since 19
*/
public static final int PRECISION = 24;
/**
* Maximum exponent a finite {@code float} variable may have. It
* is equal to the value returned by {@code
@ -122,7 +138,7 @@ public final class Float extends Number
*
* @since 1.6
*/
public static final int MAX_EXPONENT = 127;
public static final int MAX_EXPONENT = (1 << (SIZE - PRECISION - 1)) - 1; // 127
/**
* Minimum exponent a normalized {@code float} variable may have.
@ -131,14 +147,7 @@ public final class Float extends Number
*
* @since 1.6
*/
public static final int MIN_EXPONENT = -126;
/**
* The number of bits used to represent a {@code float} value.
*
* @since 1.5
*/
public static final int SIZE = 32;
public static final int MIN_EXPONENT = 1 - MAX_EXPONENT; // -126
/**
* The number of bytes used to represent a {@code float} value.