docs/opcodes/opcode-01-move.html


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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html>

<head>
<title>move</title>
<link rel=stylesheet href="opcode.css">
</head>

<body>

<h1>move</h1>

<h2>Purpose</h2>

<p>
Move the contents of one non-object register to another.
</p>

<h2>Details</h2>

<table class="instruc">
<thead>
<tr>
  <th>Op &amp; Format</th>
  <th>Mnemonic / Syntax</th>
  <th>Arguments</th>
</tr>
</thead>
<tbody>
<tr>
  <td>01 12x</td>
  <td>move vA, vB</td>
  <td><code>A:</code> destination register (4 bits)<br/>
    <code>B:</code> source register (4 bits)</td>
</tr>
<tr>
  <td>02 22x</td>
  <td>move/from16 vAA, vBBBB</td>
  <td><code>A:</code> destination register (8 bits)<br/>
    <code>B:</code> source register (16 bits)</td>
</tr>
<tr>
  <td>03 32x</td>
  <td>move/16 vAAAA, vBBBB</td>
  <td><code>A:</code> destination register (16 bits)<br/>
    <code>B:</code> source register (16 bits)</td>
</tr>
</tbody>
</table>

<h2>Constraints</h2>

<ul>
  <li>
    Both A and B must be valid register indices in the current stack frame.
  </li>
  <li>
    Register vB must be defined.
  </li>
  <li>
    Register vB must not contain a reference value.
  </li>
  <li>
    Register vB must not be part of a register pair.
  </li>
</ul>

<h2>Behavior</h2>

<ul>
  <li>
    The value of register vB is moved to register vA, that is, vA' = vB.
  </li>
  <li>
    If register v(A-1) is the first half of a register pair, register v(A-1)'
    becomes undefined.
  </li>
  <li>
    If register v(A+1) is the second half of a register pair, register v(A+1)'
    becomes undefined.
  </li>
</ul>

<h2>Exceptions</h2>

<p>
None.
</p>

</body>
</html>