Mapping the RISC-V Extensions Landscape

About the Organization

<p>The RISC-V Extensions Landscape is an open-source, interactive web tool that serves as a single searchable reference for the entire RISC-V Instruction Set Architecture ecosystem. It visualizes all ratified, draft, and discontinued extensions, displays per-instruction 32-bit encoding diagrams with match/mask values, and supports filtering by RISC-V profiles (RVA20, RVA22, RVA23, RVB23). The project is live at https://rpsene.github.io/riscv-extensions-landscape/ and built with React, Tailwind CSS, and Webpack.</p><p><br></p><p>The core challenge is that only 83 of 220 cataloged extensions (38%) have their instruction details fully mapped. The remaining 137 extensions exist in the catalog but lack instruction encodings, leaving significant gaps in supervisor-level extensions (trap, interrupt, memory), vector subsets, and vector cryptography bundles. Additionally, 104 extension tags from the upstream riscv-opcodes project remain unlinked due to naming mismatches between the source data and the catalog, preventing automated synchronization.</p><p><br></p><p>The mentee will work on three main tasks: (1) reconcile the 104 mismatched extension tags from riscv-opcodes with the catalog's naming conventions, enabling the sync script to automatically populate instruction data; (2) research and map instructions for the remaining extensions, particularly supervisor-level extensions that define CSR behaviors and vector subset extensions that represent subsets of the V extension; and (3) improve the sync tooling to detect gaps and generate coverage reports automatically. The mentee will gain hands-on experience with the RISC-V ISA, open-source data engineering, and React-based visualization tools.</p><p>&nbsp;</p>