* To hold all Vector Context, four SPRs are needed.
(Some 32/32-to-64 aliases are advantageous but not critical).
* Five 6-bit XO (A-Form) "Management" instructions are needed. These are
- Scalar 32-bit instructions and *may* be 64-bit-extended in future
- (safely within the SVP64 space: no need for an EXT001 encoding).
+ Scalar 32-bit instructions and *may* be 64-bit-extended in future as
+ EXT1xx Encodings.
**Summary of Simple-V Opcode space**
-* 75% of one Major Opcode (equivalent to the rest of EXT017)
+* 50% of a new 64-bit Encoding (PO9)
* Five 6-bit XO 32-bit "Management" operations.
No further opcode space *for Simple-V* is envisaged to be required for
* **svindex** - convenience instruction for setting up "Indexed" REMAP.
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+
# SVP64 24-bit Prefixes
The SVP64 24-bit Prefix (RM) options aim to reduce instruction count