EmbeddingGemma 2: an open, lightweight multimodal embedding model
deepmind.google·6d ago
AI Engineering
Lobsters·Aug 28·5 min read
Zero-Cost 'Tagless Final' in Rust with GADT-style Enums
TL;DR
A new implementation of the 'Tagless Final' pattern in Rust using Generalized Algebraic Data Types (GADTs) allows for high-level abstractions without performance loss. This approach enables the creation of embedded domain-specific languages with optimal assembly code generation.
✦ Why It Matters
Explore using GADTs in Rust to create efficient embedded DSLs without sacrificing performance.
Key Takeaways
- Utilize GADTs to represent expressions in Rust for DSLs.
- Leverage the never type to ensure compile-time optimizations.
- Avoid runtime tags to maintain zero-cost performance.
- Experiment with the provided code to understand the implementation.
How It Works
The implementation uses GADTs to define expressions, ensuring that only one variant of an enum is constructible by employing Rust's never type. This allows the compiler to optimize the code by removing runtime checks and tags, resulting in efficient assembly output.