# Form `M` — M — Mask (rlwinm/rlwimi/rlwnm)

## Bit Layout

| Bits | Field | Meaning |
| --- | --- | --- |
| 0–5 | `OPCD` | primary opcode |
| 6–10 | `RS` | source GPR |
| 11–15 | `RA` | destination GPR |
| 16–20 | `SH/RB` | shift amount or source B |
| 21–25 | `MB` | mask begin |
| 26–30 | `ME` | mask end |
| 31 | `Rc` | record-form flag |

## Instructions Using This Form

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| Mnemonic | Opcode | Group | Description |
| --- | --- | --- | --- |
| [`rlwimix`](../alu/rlwimix.md) | `0x50000000` | integer | Rotate Left Word Immediate then Mask Insert |
| [`rlwinmx`](../alu/rlwinmx.md) | `0x54000000` | integer | Rotate Left Word Immediate then AND with Mask |
| [`rlwnmx`](../alu/rlwnmx.md) | `0x5c000000` | integer | Rotate Left Word then AND with Mask |

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