(caveat: see bits 8-31)
* **old-suffix** - the EXT000 to EXT063 32-bit Major opcodes of Power ISA 3.0
* **new-suffix** - two **new** Major Opcode areas **exclusively**
- for Scalar-only instructions that shall **never** be Prefixed by SVP64:
- RESERVED1 EXT200-EXT263 and
- RESERVED2 EXT300-EXT363
+ for Scalar-only instructions that shall **never** be Prefixed by SVP64
+ (RESERVED2 EXT300-EXT363) and one that may (RESERVED1 EXT200-EXT263)
* **0000** - all 24 bits bits 8-31 are zero (0x000000)
* **!zero** - bits 8-31 may be any value *other* than zero (0x000001-0xffffff)
* **nnnn** - bits 8-31 may be any value in the range 0x000000 to 0xffffff