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<title>move-result-wide</title>
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<h1>move-result-wide</h1>
<h2>Purpose</h2>
<p>
Move the double-word result of the most recent invoke-kind into the indicated
register pair. This must be done as the instruction immediately after an
invoke-kind whose (double-word) result is not to be ignored; anywhere else is
invalid.
</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>0b 11x</td>
<td>move-result-wide vAA</td>
<td><code>A:</code> destination register pair (8 bits)</td>
</tr>
</tbody>
</table>
<h2>Constraints</h2>
<ul>
<li>
A+1 must be a valid register index in the current stack frame (which
includes A itself being valid).
</li>
<li>
The instruction must be immediately preceded (in the code array) by an
invoke-kind instruction.
</li>
<li>
The instruction must be immediately reached (in the actual control flow)
through returning from this invoke-kind instruction (it must not be jumped
to).
</li>
<li>
The result delivered by the invoke-kind instruction must be either a long
or a double value.
</li>
</ul>
<h2>Behavior</h2>
<ul>
<li>
The upper 32 bits of the result delivered by the invoke-kind instruction are
moved to register vA, that is, vA' = result >> 0x20.
</li>
<li>
The lower 32 bits of the result delivered by the invoke-kind instruction are
moved to register v(A+1), that is, v(A+1)' = result & 0xffffffff.
</li>
<li>
If register v(A-1) is the lower half of a register pair, register v(A-1)'
becomes undefined.
</li>
<li>
If register v(A+2) is the upper half of a register pair, register v(A+2)'
becomes undefined.
</li>
</ul>
<h2>Exceptions</h2>
<p>
None.
</p>
<h2>Notes</h2>
<p>
This instruction can also be thought of as reading the contents of a special
"result" register that is made valid and defined by executing a non-void return
instruction or a filled-new-array instruction. The execution of any other
instruction (including this one) renders this special register invalid.
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