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<title>unop</title>
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<h1>unop</h1>
<h2>Purpose</h2>
<p>
Perform the identified unary operation on the source register, storing the
result in the destination register.
</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>7b..8f 12x</td>
<td><i>unop</i> vA, vB<br/>
7b: neg-int<br/>
7c: not-int<br/>
7d: neg-long<br/>
7e: not-long<br/>
7f: neg-float<br/>
80: neg-double<br/>
81: int-to-long<br/>
82: int-to-float<br/>
83: int-to-double<br/>
84: long-to-int<br/>
85: long-to-float<br/>
86: long-to-double<br/>
87: float-to-int<br/>
88: float-to-long<br/>
89: float-to-double<br/>
8a: double-to-int<br/>
8b: double-to-long<br/>
8c: double-to-float<br/>
8d: int-to-byte<br/>
8e: int-to-char<br/>
8f: int-to-short
</td>
<td><code>A:</code> destination register or pair (4 bits)<br/>
<code>B:</code> source register or pair (4 bits)</td>
</tr>
</tbody>
</table>
<h2>Constraints</h2>
<ul>
<li>
Both A and B must be valid register indices for the current stackframe.
</li>
<li>
If the input type of <unop> is double or long, also B+1 must be a
valid register index in the current stackframe.
</li>
<li>
If the output type of <unop> is double or long, also A+1 must be a
valid register index in the current stackframe.
</li>
<li>
The type of register vB must match the source type of the instruction (this
probably needs more detail).
</li>
</ul>
<h2>Behavior</h2>
<ul>
<li>
The given operation <unop> is performed according to the semantics
specified in table XXX.
</li>
<li>
The result is stored in register vA, that is, vA'=<unop> vB.
</li>
<li>
It gets a bit messy if we want to describe all the combinations of input and
output with and without pairs here. Probably it's better to split it up.
</li>
</ul>
<h2>Exceptions</h2>
<ul>
<li>
ArithmeticException if an arithmetic error occurs during the instruction.
</li>
</ul>
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