Home | History | Annotate | Download | only in opcodes 
      1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
      2 
      3 <html>
      4 
      5 <head>
      6 <title>goto/16</title>
      7 <link rel=stylesheet href="opcode.css">
      8 </head>
      9 
     10 <body>
     11 
     12 <h1>goto/16</h1>
     13 
     14 <h2>Purpose</h2>
     15 
     16 <p>
     17 Unconditionally jump to the indicated instruction.
     18 </p>
     19 <p>
     20 Note: The branch offset may not be 0. (A spin loop may be legally constructed
     21 either with goto/32 or by including a nop as a target before the branch.)
     22 </p>
     23 
     24 <h2>Details</h2>
     25 
     26 <table class="instruc">
     27 <thead>
     28 <tr>
     29   <th>Op &amp; Format</th>
     30   <th>Mnemonic / Syntax</th>
     31   <th>Arguments</th>
     32 </tr>
     33 </thead>
     34 <tbody>
     35 <tr>
     36   <td>29 20t</td>
     37   <td>goto/16 +AAAA</td>
     38   <td><code>A:</code> signed branch offset (16 bits)<br/></td>
     39 </tr>
     40 </tbody>
     41 </table>
     42 
     43 <h2>Constraints</h2>
     44 
     45 <ul>
     46   <li>
     47     A must point to a valid bytecode instruction inside the current method.
     48   </li>
     49   <li>
     50     A must not be 0.
     51   </li>
     52 </ul>
     53 
     54 <h2>Behavior</h2>
     55 
     56 <ul>
     57   <li>
     58     The (otherwise invisible) program counter PC is set to the address of the
     59     instruction plus the given offset, that is, PC' = PC(goto) + A.
     60   </li>
     61   <li>
     62     Executions resumes at PC'.
     63   </li>
     64 </ul>
     65 
     66 <h2>Exceptions</h2>
     67 
     68 <p>
     69 None.
     70 </p>
     71 
     72 </body>
     73 </html>
     74