Target: `rv{32,64}em` with opt level `O3`

| Operation | int width | XLEN | emitted instructions |
| -- | -- | -- | -- |
| add | 64 | 32 | 6 |
| add | 64 | 64 | 1 |
| mul | 64 | 32 | 7 |
| mul | 64 | 64 | 1 |
| udiv | 64 | 32 | 6 |
| udiv | 64 | 64 | 1 |
| add | 128 | 32 | 32 |
| add | 128 | 64 | 6 |
| mul | 128 | 32 | 61 |
| mul | 128 | 64 | 7 |
| udiv | 128 | 32 | 41 |
| udiv | 128 | 64 | 6 |
| add | 256 | 32 | 83 |
| add | 256 | 64 | 32 |
| mul | 256 | 32 | 411 |
| mul | 256 | 64 | 61 |
| udiv | 256 | 32 | 1390 |
| udiv | 256 | 64| 723 |