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| <head> |
| <title>move-object</title> |
| <link rel=stylesheet href="opcode.css"> |
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| <body> |
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| <h1>move-object</h1> |
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| <h2>Purpose</h2> |
| |
| <p> |
| Move the contents of one object-bearing register to another. |
| </p> |
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| <h2>Details</h2> |
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| <table class="instruc"> |
| <thead> |
| <tr> |
| <th>Op & Format</th> |
| <th>Mnemonic / Syntax</th> |
| <th>Arguments</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>07 12x</td> |
| <td>move-object vA, vB</td> |
| <td><code>A:</code> destination register (4 bits)<br/> |
| <code>B:</code> source register (4 bits)</td> |
| </tr> |
| <tr> |
| <td>08 22x</td> |
| <td>move-object/from16 vAA, vBBBB</td> |
| <td><code>A:</code> destination register (8 bits)<br/> |
| <code>B:</code> source register (16 bits)</td> |
| </tr> |
| <tr> |
| <td>09 32x</td> |
| <td>move-object/16 vAAAA, vBBBB</td> |
| <td><code>A:</code> destination register (16 bits)<br/> |
| <code>B:</code> source register (16 bits)</td> |
| </tr> |
| </tbody> |
| </table> |
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| <h2>Constraints</h2> |
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| <ul> |
| <li> |
| Both A and B must be legal register indices in the current stack frame. |
| </li> |
| <li> |
| Register vB must be defined. |
| </li> |
| <li> |
| Register vB must contain a reference value (which excludes the case of it |
| being part of a register pair). |
| </li> |
| </ul> |
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| <h2>Behavior</h2> |
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| <ul> |
| <li> |
| The value of register vB is moved to register vA, that is, vA' = vB. |
| </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+1) is the upper half of a register pair, register v(A+1)' |
| becomes undefined. |
| </li> |
| </ul> |
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| <h2>Exceptions</h2> |
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| <p> |
| None. |
| </p> |
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