# Form `DS` — DS — Doubleword Shift (word-scaled displacement)

## Bit Layout

| Bits | Field | Meaning |
| --- | --- | --- |
| 0–5 | `OPCD` | primary opcode |
| 6–10 | `RT` | destination GPR (or RS) |
| 11–15 | `RA` | source GPR (0 ⇒ literal 0) |
| 16–29 | `DS` | 14-bit signed word-scaled displacement |
| 30–31 | `XO` | extended opcode |

## Instructions Using This Form

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| Mnemonic | Opcode | Group | Description |
| --- | --- | --- | --- |
| [`ld`](../memory/ld.md) | `0xe8000000` | memory | Load Doubleword |
| [`ldu`](../memory/ld.md) | `0xe8000001` | memory | Load Doubleword with Update |
| [`lwa`](../memory/lwa.md) | `0xe8000002` | memory | Load Word Algebraic |
| [`std`](../memory/std.md) | `0xf8000000` | memory | Store Doubleword |
| [`stdu`](../memory/std.md) | `0xf8000001` | memory | Store Doubleword with Update |

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