docs/opcodes/opcode-90-binop.html


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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html>

<head>
<title>binop</title>
<link rel=stylesheet href="opcode.css">
</head>

<body>

<h1>binop</h1>

<h2>Purpose</h2>

<p>
Perform the identified binary operation on the two source registers, storing
the result in the first source register.
</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>90..af 23x</td>
  <td><i>binop</i> vAA, vBB, vCC<br/>
    90: add-int<br/>
    91: sub-int<br/>
    92: mul-int<br/>
    93: div-int<br/>
    94: rem-int<br/>
    95: and-int<br/>
    96: or-int<br/>
    97: xor-int<br/>
    98: shl-int<br/>
    99: shr-int<br/>
    9a: ushr-int<br/>
    9b: add-long<br/>
    9c: sub-long<br/>
    9d: mul-long<br/>
    9e: div-long<br/>
    9f: rem-long<br/>
    a0: and-long<br/>
    a1: or-long<br/>
    a2: xor-long<br/>
    a3: shl-long<br/>
    a4: shr-long<br/>
    a5: ushr-long<br/>
    a6: add-float<br/>
    a7: sub-float<br/>
    a8: mul-float<br/>
    a9: div-float<br/>
    aa: rem-float<br/>
    ab: add-double<br/>
    ac: sub-double<br/>
    ad: mul-double<br/>
    ae: div-double<br/>
    af: rem-double
  </td>
  <td><code>A:</code> destination register or pair (8 bits)<br/>
    <code>B:</code> first source register or pair (8 bits)<br/>
    <code>C:</code> second source register or pair (8 bits)</td>
</tr>
</tbody>
</table>

<h2>Constraints</h2>

<ul>
  <li>
    All A, B and C must be valid register indices in the current stackframe.
  </li>
  <li>
    For the -long and -double variants, also A+1, B+1 and C+1 must be valid
    register indices.
  </li>
  <li>
    Registers vB and vC must be defined. They must both contain values that
    match the variant of the instruction (it's probably better to split this up
    into multiple pages again).
  </li>
</ul>

<h2>Behavior</h2>

<ul>
  <li>
    The given operation &lt;binop&gt; is performed according to the semantics
    specified in table XXX.
  </li>
  <li>
    The result is stored in register vA, that is, vA'=&lt;biop&gt; vB.
  </li>
  <li>
    For the -double and -long variants, (vA+1) is also affected.
  </li>
  <li>
    As usual, neighboring registers might get undefined, if vA (and vA+1) were
    part of a register pair originally.
  </li>
</ul>

<h2>Exceptions</h2>

<ul>
  <li>
    ArithmeticException if an error occurs during the instruction.
  </li>
</ul>

</body>
</html>