APKinspector / androguard / specs / dalvik / opcodes / opcode-16-const-wide.html

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<head>
<title>const-wide</title>
<link rel=stylesheet href="opcode.css">
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<h1>const-wide</h1>

<h2>Purpose</h2>

<p>
Move the given literal value (sign-extended to 64 bits) into the specified
register-pair. 
</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>16 21s</td>
  <td>const-wide/16 vAA, #+BBBB</td>
  <td><code>A:</code> destination register (8 bits)<br/>
    <code>B:</code> signed int (16 bits)</td>
</tr>
<tr>
  <td>17 31i</td>
  <td>const-wide/32 vAA, #+BBBBBBBB</td>
  <td><code>A:</code> destination register (8 bits)<br/>
    <code>B:</code> signed int (32 bits)</td>
</tr>
<tr>
  <td>18 51l</td>
  <td>const-wide vAA, #+BBBBBBBBBBBBBBBB</td>
  <td><code>A:</code> destination register (8 bits)<br/>
    <code>B:</code> arbitrary double-width (64-bit) constant</td>
</tr>
<tr>
  <td>19 21h</td>
  <td>const-wide/high16 vAA, #+BBBB000000000000</td>
  <td><code>A:</code> destination register (8 bits)<br/>
    <code>B:</code> signed int (16 bits)</td>
</tr>
</tbody>
</table>

<h2>Constraints</h2>

<ul>
  <li>
    A must be a valid register index in the current stack frame.
  </li>
</ul>

<h2>Behavior</h2>

<ul>
  <li>
    First, an adjusted value B' is determined as follows:
    <ul>
      <li>
        If we are executing the /high16 variant, then B is left-shifted by 40
        bits, that is, B'=B << 0x28
      <li>
        Otherwise, if B is a 16 bit or 32 bit constant, it is sign-extended to
        64 bits, that is, B'=sign-extended(B).
      </li>
      <li>
        Otherwise, B'=B.
      </li>
    </ul>
  <li>
    The immediate value B is moved into the register pair (vA, v(A+1)), that is,
    <ul>
      <li>
        vA' = B << 0x20
      </li>
      <li>
        v(A+1)' = B & 0xffffffff
      </li>
    </ul>
  </li>
  <li>
    If v(A-1) is the lower half of a register pair, v(A-1)' becomes undefined.
  </li>
  <li>
    If v(A+2) is the upper half of a register pair, v(A+2)' becomes undefined.
  </li>
</ul> 

<h2>Exceptions</h2>

<p>
None.
</p>

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