LAMDA: Learning-Assisted Multi-stage Autotuning for FPGA Design Closure

A primary barrier to rapid hardware specialization with FPGAs stems from weak guarantees of existing CAD tools on achieving design closure. Current methodologies require extensive manual efforts to configure a large set of options across multiple stages of the toolflow, intended to achieve high quality-of-results. Due to the size and complexity of the design space spanned by these options, coupled with the time-consuming evaluation of each design point, exploration for reconfigurable computing has become remarkably challenging. To tackle this challenge, we present a learning-assisted autotuning framework called LAMDA, which accelerates FPGA design closure by utilizing design-specific features extracted from early stages of the design flow to guide the tuning process with significant runtime savings. LAMDA automatically configures logic synthesis, technology mapping, placement, and routing to achieve design closure efficiently. Compared with a state-of-the-art FPGA-targeted autotuning system, LAMDA realizes faster timing closure on various realistic benchmarks using Intel Quartus Pro.