RISC-V International
All extensions shall go through the Opcode and State Review before progressing to the Freeze milestone as specified in the Definition of Done Policy
- The Reviews (other than Opcode and State) that were previously performed by the O&CR are new performed by the overseeing (Un)Privileged ISA Committee. These include:
- Consistency with the RISC-V Architecture and philosophy
- Proof of Concept (PoC) – criteria for each extension to be decided by the IC on an extension-by-extension basis
- Utility and Efficiency (relative to all other instructions)
- Documentation
- Clarity
- Completeness - all cases fully defined
- Rationale for each instruction or closely related group
- Cost
- Size (gates)
- Timing (NAND2 FO4)
- Value – what the instructions replace
- Compartmentalization (e.g., normative separated from non-normative)
- No oversharing – no references to current implementations or usage which might be the IP of any entity other than the Member who has proposed the instruction
| TG/FT | Board Priority | Fast Track | Review | Contact | Extension | Sub Extensions | Status | Effort | ETA | Comment |
| BitManip | Yes | No | Final | Ken Dockser | B | Zba, Zbb, Zbc, Zbs | complete (except for doc updates) | s | 5/31/21 | ASCII doc for public review close to completion |
| BitManip | (Yes) | No | Final | Ken Dockser | B | (Scalar Crypto required instructions) Zbk? | started | m | 5/31/21 | |
| TEE | Yes | No | Final | Joe Xie | ePMP | N/A | in final review | m | 5/31/21 | |
| Crypto | Yes | No | Final | Ben Marshall | K | (Scalar) | started | m | 5/15/21 | Bitmanip crypto-required extensions (Zbk?) reviewed in parallel |
| Vector | Yes | No | Final | Krste | V | All except: Zvqmac and Zvediv | in queue | m-l | Needed for RVA22 | |
| Virtual Memory | Yes | No | Final | Dan Lustig | Base? | Svnapot | in queue | s | NAPOT Translation Contiguity | |
| Privileged | No | Yes | Final | Greg Favor | Sstc | hypervisor? Sys? | in queue | s | stimecmp / vstimecmp | |
| Packed-SIMD | Yes | No | Final | Chuanhua Chang | P | - | in queue | xl | ||
| Privileged | No | Yes | Final | Greg Favor | Sscofpmf | - | in queue | s | PerfMon Overflow and Mode Filtering | |
| TEE and J | No | No | Final | Adam Zabrocki | J | Pointer Masking | in queue | s | ||
| Zfinx | No | No | Final | Tariq Kurd | Zfinx | Zfinx | N/A | s | No new Opcodes or State | |
| Code Size Reduction | No | No | Early | Tariq Kurd | Zce | - | in queue | s | Spec not ready for final review. They requested early feedback. | |
| Debug | No | No | Final | Tim Newsome | Debug | N/A | in queue | s-m | Built on top of ratified 0.13 spec |
- Effort - amount of effort remaining in the review (s,m,l,xl)
- ETA- date for feedback (issues to be corrected) to proposer, or approval
- Contact Opcode and Consistency Review at: tech-opcode-and-consistency-review@lists.riscv.org
- Use the above address to submit a specification for review.
- Join the list: tech-opcode-and-consistency-review+subscribe@lists.riscv.org
- View past posts and other information at: https://lists.riscv.org/g/tech-opcode-and-consistency-review
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