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      6 <title>unop</title>
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     10 <body>
     11 
     12 <h1>unop</h1>
     13 
     14 <h2>Purpose</h2>
     15 
     16 <p>
     17 Perform the identified unary operation on the source register, storing the
     18 result in the destination register.
     19 </p>
     20 
     21 <h2>Details</h2>
     22 
     23 <table class="instruc">
     24 <thead>
     25 <tr>
     26   <th>Op &amp; Format</th>
     27   <th>Mnemonic / Syntax</th>
     28   <th>Arguments</th>
     29 </tr>
     30 </thead>
     31 <tbody>
     32 <tr>
     33   <td>7b..8f 12x</td>
     34   <td><i>unop</i> vA, vB<br/>
     35     7b: neg-int<br/>
     36     7c: not-int<br/>
     37     7d: neg-long<br/>
     38     7e: not-long<br/>
     39     7f: neg-float<br/>
     40     80: neg-double<br/>
     41     81: int-to-long<br/>
     42     82: int-to-float<br/>
     43     83: int-to-double<br/>
     44     84: long-to-int<br/>
     45     85: long-to-float<br/>
     46     86: long-to-double<br/>
     47     87: float-to-int<br/>
     48     88: float-to-long<br/>
     49     89: float-to-double<br/>
     50     8a: double-to-int<br/>
     51     8b: double-to-long<br/>
     52     8c: double-to-float<br/>
     53     8d: int-to-byte<br/>
     54     8e: int-to-char<br/>
     55     8f: int-to-short
     56   </td>
     57   <td><code>A:</code> destination register or pair (4 bits)<br/>
     58     <code>B:</code> source register or pair (4 bits)</td>
     59 </tr>
     60 </tbody>
     61 </table>
     62 
     63 <h2>Constraints</h2>
     64 
     65 <ul>
     66   <li>
     67     Both A and B must be valid register indices for the current stackframe.
     68   </li>
     69   <li>
     70     If the input type of &lt;unop&gt; is double or long, also B+1 must be a
     71     valid register index in the current stackframe.
     72   </li>
     73   <li>
     74     If the output type of &lt;unop&gt; is double or long, also A+1 must be a
     75     valid register index in the current stackframe.
     76   </li>
     77   <li>
     78     The type of register vB must match the source type of the instruction (this
     79     probably needs more detail).
     80   </li>
     81 </ul>
     82 
     83 <h2>Behavior</h2>
     84 
     85 <ul>
     86   <li>
     87     The given operation &lt;unop&gt; is performed according to the semantics
     88     specified in table XXX.
     89   </li>
     90   <li>
     91     The result is stored in register vA, that is, vA'=&lt;unop&gt; vB.
     92   </li>
     93   <li>
     94     It gets a bit messy if we want to describe all the combinations of input and
     95     output with and without pairs here. Probably it's better to split it up.
     96   </li>
     97 </ul>
     98 
     99 <h2>Exceptions</h2>
    100 
    101 <ul>
    102   <li>
    103     ArithmeticException if an arithmetic error occurs during the instruction.
    104   </li>
    105 </ul>
    106 
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