# Sounio Codegen Backends > Work on Sounio code generation and backends (Cranelift, LLVM, GPU, native ELF backend); use when editing `compiler/src/codegen/`, `compiler/src/backend/`, or backend-adjacent runtime glue. Use when this capability is needed. - Skill: `tomevault-io/sounio-codegen-backends` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/sounio-codegen-backends` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/sounio-codegen-backends/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/sounio-codegen-backends --- # Sounio Codegen + Backends ## Overview Implement and debug lowering/codegen without breaking IR invariants or backend feature-flag boundaries. ## Workflow ### 1) Pick the backend path and feature flags - Cranelift: `compiler/src/codegen/cranelift.rs` (feature: `jit`) - MIR→Cranelift: `compiler/src/codegen/mir_cranelift.rs` - LLVM: `compiler/src/codegen/llvm/` (feature: `llvm`) - GPU: `compiler/src/codegen/gpu/` (feature: `gpu`) - Native backend (ELF/linker): `compiler/src/backend/native/` ### 2) Keep IR invariants explicit - If you change HLIR/MIR shape, validate passes and analyses that assume SSA form. - Be conservative around effectful ops when doing backend optimizations. ### 3) Add targeted tests - Prefer Rust tests close to the backend (`compiler/src/**/tests` and `compiler/tests/`). - GPU tests typically require `--features gpu` (see `.claude/commands/sounio-gpu.md`). ## References - Codegen map: `references/codegen-navigation.md` - Feature flags: `references/feature-flags.md` - Claude command references: `.claude/commands/sounio-gpu.md`, `.claude/commands/sounio-build.md` --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/sounio-lang) — claim your Tome and manage your conversions.