# Form `VX128_R` — VX128_R — VMX128 compare (with Rc → CR6)

## Bit Layout

| Bits | Field | Meaning |
| --- | --- | --- |
| 0–5 | `OPCD` | primary opcode (4) |
| 6–10 | `VD128l` | destination low 5 bits |
| 11–15 | `VA128l` | source A low 5 bits |
| 16–20 | `VB128l` | source B low 5 bits |
| 21 | `VA128H` | source A high bit |
| 22–25 | `XO` | extended opcode (compare) |
| 26 | `VA128h` | source A middle bit |
| 27 | `Rc` | record-form flag (updates CR6) |
| 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 |
| --- | --- | --- | --- |
| [`vcmpeqfp128`](../vmx128/vcmpeqfp.md) | `0x18000000` | vmx | Vector128 Compare Equal-to Floating Point |
| [`vcmpgefp128`](../vmx128/vcmpgefp.md) | `0x18000080` | vmx | Vector128 Compare Greater-Than-or-Equal-to Floating Point |
| [`vcmpgtfp128`](../vmx128/vcmpgtfp.md) | `0x18000100` | vmx | Vector128 Compare Greater-Than Floating-Point |
| [`vcmpbfp128`](../vmx128/vcmpbfp.md) | `0x18000180` | vmx | Vector128 Compare Bounds Floating Point |
| [`vcmpequw128`](../vmx128/vcmpequw.md) | `0x18000200` | vmx | Vector128 Compare Equal-to Unsigned Word |

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