RISC-V Instruction Set Manual

Local copies below are refreshed from upstream drafts dated 2026-09-17. Prefer the official RISC-V specifications library for ratified text.

RISC-V Assembly Programmer's Manual

Web version: RISC-V Assembly Programmer's Manual

RISC-V Instruction Set Manual

The ISA manual is now published as a combined HTML document (Volumes I–III). The Volume I / II paths below still work and point at that combined snapshot.

Combined ISA Manual (20260917-draft)

Web version: The RISC-V Instruction Set Manual

• Unprivileged volume: markdown · HTML
• Privileged volume: markdown · HTML
• Profiles volume: HTML

Official ratified HTML (20260120): Volume I · library home

RISC-V Optimization Guide

Web version: RISC-V Optimization Guide

RISC-V Unified Database

• Generated ISA manuals
• ISA Explorer: extensions
• ISA Explorer: instructions
• ISA Explorer: CSRs
• UDB documentation preview

Cores

Rocket Chip — Chipyard 1.14.0

Also: latest Chipyard docs

RISCV-BOOM documentation

XiangShan 香山

• XiangShan documentation
• Design document

Software

• Spike ISA simulator
• QEMU RISC-V system emulation
• RISC-V GNU toolchain
• LLVM
• Sail RISC-V model
• OpenSBI
• RISC-V SBI specification

Third-party tools

• rvcodec.js · RISC-V Instruction Encoder/Decoder
• rvcodec.js (Vercel)
• QtRVSim: RISC-V simulator for education

Reference

• riscv-non-isa/riscv-asm-manual
• riscv/riscv-isa-manual
• Latest ISA HTML snapshot
• riscv-unified-db
• RISE RISC-V Optimization Guide
• RISC-V Optimization Guide (HTML)