# riscvarchive/riscv-v-spec

Working draft of the proposed RISC-V V vector extension

Repository: https://github.com/riscvarchive/riscv-v-spec
Canonical: https://ross.abutalabs.com/products/riscv-v-spec
Homepage: https://jira.riscv.org/browse/RVG-122
Language: Assembly
License: CC-BY-4.0
License Family: other
Archived: true
Last push: 2024-03-17T15:04:35+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 2959, "days_push": 899, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1088, forks 280 (observed 2026-08-28T04:03:32.534485+00:00)

## What it is
The working draft specification for the RISC-V V vector extension, written in AsciiDoc. It defines the vector instruction set architecture that toolchains, simulators, and hardware implementations are built against.

## Use cases
- implement the RISC-V vector extension in a simulator
- add RVV instruction support to a compiler toolchain
- learn how RISC-V vector instructions work
- check the ratified vector ISA spec details
- write assembly using RISC-V vector instructions

## When to choose
- you are developing RISC-V hardware, simulators, or toolchains needing the authoritative vector extension spec
- you want to understand or teach the RISC-V V extension ISA

## When to avoid
- you need a runnable simulator or toolchain rather than a specification document
- you need a finalized ratified standard with guaranteed stability beyond v1.0

## Facets
- artifact type: learning-resource
- maturity: stable
- function: documentation, programming-language
- domain: hardware, documentation, compilers
- platform: cross-platform
- tags: risc-v, vector-extension, isa-specification, specification-draft, assembly

## Member repositories
- riscvarchive/riscv-v-spec (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:32.534485+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:49:22.893609+00:00, confidence not recorded.
  - readme: https://github.com/riscvarchive/riscv-v-spec (fetched 2026-08-28T04:03:32.534485+00:00, sha e09add4d99f7)
  - homepage: https://jira.riscv.org/browse/RVG-122 (fetched 2026-08-29T12:51:50.824641+00:00, sha be0013a193a0)
- Data as of 2026-08-30T08:39:29.467469+00:00.