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<title>const-wide</title>
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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 & Format</th>
<th>Mnemonic / Syntax</th>
<th>Arguments</th>
</tr>
</thead>
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<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>
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<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>
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<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>
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<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>
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<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.
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