1 /*
   2  * Copyright (c) 2014, 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  * Common library for additional constants of the <code>Float</code> type.
  26  */
  27 public final class FloatUtils {
  28 
  29     /**
  30      * Bias used in representing a <code>Float</code> exponent.
  31      */
  32     public static final int     EXP_BIAS        = 127;
  33 
  34     /**
  35      * Bit mask to isolate the exponent field of a
  36      * <code>Float</code>.
  37      */
  38     public static final int     EXP_BIT_MASK    = 0x7F800000;
  39 
  40     /**
  41      * Bit mask to isolate the sign bit of a <code>Float</code>.
  42      */
  43     public static final int     SIGN_BIT_MASK   = 0x80000000;
  44 
  45     /**
  46      * Bit mask to isolate the significand field of a
  47      * <code>Float</code>.
  48      */
  49     public static final int     SIGNIF_BIT_MASK = 0x007FFFFF;
  50 
  51     /**
  52      * The number of logical bits in the significand of a
  53      * <code>Float</code> number, including the implicit bit.
  54      */
  55     public static final int SIGNIFICAND_WIDTH   = 24;
  56 
  57     /**
  58      * The exponent the smallest positive <code>Float</code> subnormal
  59      * value would have if it could be normalized.
  60      */
  61     public static final int     MIN_SUB_EXPONENT = Float.MIN_EXPONENT -
  62                                                    (SIGNIFICAND_WIDTH - 1);
  63 
  64 }