modules/cldc-compact/src/main/java/cc/squirreljme/jvm/SoftInteger.java

   1 // -*- Mode: Java; indent-tabs-mode: t; tab-width: 4 -*-
   2 // ---------------------------------------------------------------------------
   3 // SquirrelJME
   4 //     Copyright (C) Stephanie Gawroriski <xer@multiphasicapps.net>
   5 // ---------------------------------------------------------------------------
   6 // SquirrelJME is under the GNU General Public License v3+, or later.
   7 // See license.mkd for licensing and copyright information.
   8 // ---------------------------------------------------------------------------
   9
  10 package cc.squirreljme.jvm;
  11
  12 import cc.squirreljme.runtime.cldc.annotation.Exported;
  13 import cc.squirreljme.runtime.cldc.debug.Debugging;
  14
  15 /**
  16  * Software integer operations.
  17  *
  18  * @since 2019/05/27
  19  */
  20 @Exported
  21 @SuppressWarnings("MagicNumber")
  22 public final class SoftInteger
  23 {
  24         /**
  25          * Not used.
  26          *
  27          * @since 2019/05/27
  28          */
  29         private SoftInteger()
  30         {
  31         }
  32
  33         /**
  34          * Converts to double.
  35          *
  36          * @param __a A.
  37          * @return The result.
  38          * @since 2019/05/24
  39          */
  40         @Exported
  41         public static double toDouble(int __a)
  42         {
  43                 Assembly.breakpoint();
  44                 throw Debugging.todo();
  45         }
  46
  47         /**
  48          * Converts to float.
  49          *
  50          * @param __a A.
  51          * @return The result.
  52          * @since 2019/05/24
  53          */
  54         @Exported
  55         public static float toFloat(int __a)
  56         {
  57                 boolean sign = (__a < 0);
  58
  59                 // if ( ! (a & 0x7FFFFFFF) ) {
  60                 if ((__a & 0x7FFF_FFFF) == 0)
  61                 {
  62                         // uZ.ui = sign ? packToF32UI( 1, 0x9E, 0 ) : 0;
  63                         return Float.intBitsToFloat((sign ?
  64                                 SoftFloat.__packToF32UI(true, 0x9E, 0) :
  65                                 0));
  66                 }
  67
  68                 int absA = sign ? -__a : __a;
  69
  70                 // return softfloat_normRoundPackToF32( sign, 0x9C, absA );
  71                 return Float.intBitsToFloat(
  72                         SoftFloat.__normRoundPackToF32(sign, 0x9C, absA));
  73         }
  74
  75         /**
  76          * Converts to long.
  77          *
  78          * @param __a A.
  79          * @return The result.
  80          * @since 2019/05/24
  81          */
  82         @Exported
  83         public static long toLong(int __a)
  84         {
  85                 // If the integer has the sign bit, then it will be sign extended
  86                 // meaning all the upper bits get set
  87                 if ((__a & 0x80000000) != 0)
  88                         return Assembly.longPack(__a, 0xFFFFFFFF);
  89
  90                 // Otherwise, the top is just zero
  91                 else
  92                         return Assembly.longPack(__a, 0);
  93         }
  94 }
  95