AgRefactor: Refactoring for HLS Compatibility with a Self-Evolving Agentic Workflow

High-Level Synthesis (HLS) provides a fast path from concepts to silicon, but practical HLS design flows begin with a tedious step: refactoring software into HLS-compatible programs. Converting real-world software remains challenging due to restrictive language support and the gap between software and hardware programming practices, and this preparatory phase can take domain experts days even for an initial synthesizable design. Existing automated refactoring methods and recent LLM-based workflows partially address this problem, yet they often fall short in generalizability, scalability, and cost efficiency.