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-<head>
-<title>packed-switch</title>
-<link rel=stylesheet href="opcode.css">
-</head>
-
-<body>
-
-<h1>packed-switch</h1>
-
-<h2>Purpose</h2>
-
-<p>
-Jump to a new instruction based on the value in the given register, using a
-table of offsets corresponding to each value in a particular integral range, or
-fall through to the next instruction if there is no match.
-</p>
-<p>
-Note: The address of the table is guaranteed to be even (that is, 4-byte
-aligned). If the code size of the method is otherwise odd, then an extra code
-unit is inserted between the main code and the table whose value is the same as
-a nop.
-</p>
-
-<h2>Details</h2>
-
-<table class="instruc">
-<thead>
-<tr>
- <th>Op & Format</th>
- <th>Mnemonic / Syntax</th>
- <th>Arguments</th>
-</tr>
-</thead>
-<tbody>
-<tr>
- <td>2b 31t</td>
- <td>packed-switch vAA, +BBBBBBBB <i>(with supplemental data as
- specified below in "<code>packed-switch</code> Format")</i></td>
- <td><code>A:</code> register to test<br/>
- <code>B:</code> signed "branch" offset to table data (32 bits)</td>
-</tr>
-</tbody>
-</table>
-
-<h2>Constraints</h2>
-
-<ul>
- <li>
- A must be a valid register index in the current stack frame.
- </li>
- <li>
- Let PC be the address of the packed-switch instruction in the code array of
- the current method. Then T = PC + B with the following properties:
- <ul>
- <li>
- T must be 4-byte-aligned.
- </li
- <li>
- T must be in the same method.
- </li>
- <li>
- T must point to a packed-switch data table.
- </li>
- </ul>
- </li>
-</ul>
-
-<h2>Behavior</h2>
-
-<ul>
- <li>
- The value of vA is used as an index into the given table data.
- </li>
- <li>
- If vA is in the range of the table, that is, if vA >= table.first_key and
- vA < first_key + size, then the jump target is determined as follows:
- <ul>
- <li>
- PC' = PC + table.targets[vA - table.firstKey].
- </li>
- <li>
- Execution resumes at this address.
- </li>
- </ul>
- </li>
- <li>
- Otherwise execution continues at the instruction following the packed-switch
- statement.
- </li>
-</ul>
-
-<h2>Exceptions</h2>
-
-<p>
-None.
-</p>
-
-</body>
-</html>