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+# alternative 32-64 encoding
+
+| 0-5 | 7 | 8-31      | 6 | 32|33-63|Description                        |
+|-----|---|-------|---|-----|-----------------------------------|
+| PO9 | x | xxxx  | 0 |  0 | xxxx|  `RESERVED2` (57-bit) |
+| PO9 | 0 | !zero | 0 |  1 | DWd | SVP64Single:EXT232-263, or `RESERVED3` |
+| PO9 | 0 | 0000  | 0 |  1 | DWd | Scalar EXT232-263               |
+| PO9 | 1 | nnnn  | 0 |  1 | DWd | SVP64:EXT232-263     |
+| PO9 | 0 | 0000  | 1 |  x | xxxx| `RESERVED1` (32-bit) |
+| PO9 | 0 | !zero | 1 |  n | DWd | SVP64Single:EXT000-063 or `RESERVED4` |
+| PO9 | 1 | nnnn  | 1 |  n | DWd | SVP64:EXT000-063       |