| The Android Open Source Project | f6c3871 | 2009-03-03 19:28:47 -0800 | [diff] [blame] | 1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> |
| 2 | |
| 3 | <html> |
| 4 | |
| 5 | <head> |
| 6 | <title>move</title> |
| 7 | <link rel=stylesheet href="opcode.css"> |
| 8 | </head> |
| 9 | |
| 10 | <body> |
| 11 | |
| 12 | <h1>move</h1> |
| 13 | |
| 14 | <h2>Purpose</h2> |
| 15 | |
| 16 | <p> |
| 17 | Move the contents of one non-object register to another. |
| 18 | </p> |
| 19 | |
| 20 | <h2>Details</h2> |
| 21 | |
| 22 | <table class="instruc"> |
| 23 | <thead> |
| 24 | <tr> |
| 25 | <th>Op & Format</th> |
| 26 | <th>Mnemonic / Syntax</th> |
| 27 | <th>Arguments</th> |
| 28 | </tr> |
| 29 | </thead> |
| 30 | <tbody> |
| 31 | <tr> |
| 32 | <td>01 12x</td> |
| 33 | <td>move vA, vB</td> |
| 34 | <td><code>A:</code> destination register (4 bits)<br/> |
| 35 | <code>B:</code> source register (4 bits)</td> |
| 36 | </tr> |
| 37 | <tr> |
| 38 | <td>02 22x</td> |
| 39 | <td>move/from16 vAA, vBBBB</td> |
| 40 | <td><code>A:</code> destination register (8 bits)<br/> |
| 41 | <code>B:</code> source register (16 bits)</td> |
| 42 | </tr> |
| 43 | <tr> |
| 44 | <td>03 32x</td> |
| 45 | <td>move/16 vAAAA, vBBBB</td> |
| 46 | <td><code>A:</code> destination register (16 bits)<br/> |
| 47 | <code>B:</code> source register (16 bits)</td> |
| 48 | </tr> |
| 49 | </tbody> |
| 50 | </table> |
| 51 | |
| 52 | <h2>Constraints</h2> |
| 53 | |
| 54 | <ul> |
| 55 | <li> |
| 56 | Both A and B must be valid register indices in the current stack frame. |
| 57 | </li> |
| 58 | <li> |
| 59 | Register vB must be defined. |
| 60 | </li> |
| 61 | <li> |
| 62 | Register vB must not contain a reference value. |
| 63 | </li> |
| 64 | <li> |
| 65 | Register vB must not be part of a register pair. |
| 66 | </li> |
| 67 | </ul> |
| 68 | |
| 69 | <h2>Behavior</h2> |
| 70 | |
| 71 | <ul> |
| 72 | <li> |
| 73 | The value of register vB is moved to register vA, that is, vA' = vB. |
| 74 | </li> |
| 75 | <li> |
| 76 | If register v(A-1) is the first half of a register pair, register v(A-1)' |
| 77 | becomes undefined. |
| 78 | </li> |
| 79 | <li> |
| 80 | If register v(A+1) is the second half of a register pair, register v(A+1)' |
| 81 | becomes undefined. |
| 82 | </li> |
| 83 | </ul> |
| 84 | |
| 85 | <h2>Exceptions</h2> |
| 86 | |
| 87 | <p> |
| 88 | None. |
| 89 | </p> |
| 90 | |
| 91 | </body> |
| 92 | </html> |