# Form `VX128_4` — VX128_4 — VMX128 with sub-opcode selector

## Bit Layout

| Bits | Field | Meaning |
| --- | --- | --- |
| 0–5 | `OPCD` | primary opcode (6) |
| 6–10 | `VD128l` | destination low 5 bits |
| 11–15 | `IMM` | 5-bit immediate |
| 16–20 | `VB128l` | source B low 5 bits |
| 21–23 | `XO` | extended opcode |
| 24–25 | `z` | sub-operation selector |
| 28–29 | `VD128h` | destination high 2 bits |
| 30–31 | `VB128h` | source B high 2 bits |

## Instructions Using This Form

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| Mnemonic | Opcode | Group | Description |
| --- | --- | --- | --- |
| [`vpkd3d128`](../vmx128/vpkd3d128.md) | `0x18000610` | vmx | Vector128 Pack D3Dtype, Rotate Left Immediate and Mask Insert |
| [`vrlimi128`](../vmx128/vrlimi128.md) | `0x18000710` | vmx | Vector128 Rotate Left Immediate and Mask Insert |

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