# Form `A` — A — Arithmetic (three-source FPU)

## Bit Layout

| Bits | Field | Meaning |
| --- | --- | --- |
| 0–5 | `OPCD` | primary opcode (59 or 63) |
| 6–10 | `FRT` | destination FPR |
| 11–15 | `FRA` | source A FPR |
| 16–20 | `FRB` | source B FPR |
| 21–25 | `FRC` | source C FPR (multiplier for madd-style ops) |
| 26–30 | `XO` | extended opcode (5 bits) |
| 31 | `Rc` | record-form flag (updates CR1) |

## Instructions Using This Form

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| Mnemonic | Opcode | Group | Description |
| --- | --- | --- | --- |
| [`fdivsx`](../fpu/fdivsx.md) | `0xec000024` | fpu | Floating Divide Single |
| [`fsubsx`](../fpu/fsubsx.md) | `0xec000028` | fpu | Floating Subtract Single |
| [`faddsx`](../fpu/faddsx.md) | `0xec00002a` | fpu | Floating Add Single |
| [`fsqrtsx`](../fpu/fsqrtsx.md) | `0xec00002c` | fpu | Floating Square Root Single |
| [`fresx`](../fpu/fresx.md) | `0xec000030` | fpu | Floating Reciprocal Estimate Single |
| [`fmulsx`](../fpu/fmulsx.md) | `0xec000032` | fpu | Floating Multiply Single |
| [`fmsubsx`](../fpu/fmsubsx.md) | `0xec000038` | fpu | Floating Multiply-Subtract Single |
| [`fmaddsx`](../fpu/fmaddsx.md) | `0xec00003a` | fpu | Floating Multiply-Add Single |
| [`fnmsubsx`](../fpu/fnmsubsx.md) | `0xec00003c` | fpu | Floating Negative Multiply-Subtract Single |
| [`fnmaddsx`](../fpu/fnmaddsx.md) | `0xec00003e` | fpu | Floating Negative Multiply-Add Single |
| [`fdivx`](../fpu/fdivx.md) | `0xfc000024` | fpu | Floating Divide |
| [`fsubx`](../fpu/fsubx.md) | `0xfc000028` | fpu | Floating Subtract |
| [`faddx`](../fpu/faddx.md) | `0xfc00002a` | fpu | Floating Add |
| [`fsqrtx`](../fpu/fsqrtx.md) | `0xfc00002c` | fpu | Floating Square Root |
| [`fselx`](../fpu/fselx.md) | `0xfc00002e` | fpu | Floating Select |
| [`fmulx`](../fpu/fmulx.md) | `0xfc000032` | fpu | Floating Multiply |
| [`frsqrtex`](../fpu/frsqrtex.md) | `0xfc000034` | fpu | Floating Reciprocal Square Root Estimate |
| [`fmsubx`](../fpu/fmsubx.md) | `0xfc000038` | fpu | Floating Multiply-Subtract |
| [`fmaddx`](../fpu/fmaddx.md) | `0xfc00003a` | fpu | Floating Multiply-Add |
| [`fnmsubx`](../fpu/fnmsubx.md) | `0xfc00003c` | fpu | Floating Negative Multiply-Subtract |
| [`fnmaddx`](../fpu/fnmaddx.md) | `0xfc00003e` | fpu | Floating Negative Multiply-Add |

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