Rat is a compiler backend with an x86-64 code generator that uses a priority bin-packing register allocator to map virtual registers to physical registers or stack slots. The allocator visits live ranges by importance and fits each into the first available register, replacing a previous 1392-line linear scan approach with a more efficient 584-line implementation that produces better code.
A software development methodology combines AI-assisted coding with spec-driven development, treating business requirements as the single source of truth rather than generated code. All specifications—requirements, diagrams, and use cases—are versioned in Git and reviewed by stakeholders, enabling AI to automatically maintain consistency across downstream artifacts while improving traceability and maintainability.
A user prompted Claude Opus 5.5 through Claude Code to recreate a single frame from Peppa Pig as an animated cartoon using JavaScript. Over four prompts and roughly 90 minutes, the model wrote 645 lines of code that programmatically drew every frame, character, and sound effect, measuring pixel positions and colors from the original screenshot to ensure accuracy, ultimately producing a 13-second 1080p film with synchronized music and sound effects.
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Rat is a compiler backend with an x86-64 code generator that uses a priority bin-packing register allocator to map virtual registers to physical registers or stack slots. The allocator visits live ranges by importance and achieves better code quality in 584 lines compared to the previous 1392-line linear scan approach, with design features like callee-saved register preference emerging naturally from the algorithm.