High-level synthesis - the right side of history

Abstract

High-level synthesis (HLS) was first proposed in the 1980s. After spending decades on the sidelines of mainstream RTL digital design, there has been tremendous buzz around HLS technology in recent years. Indeed, HLS is on the upswing as a design methodology for field-programmable gate arrays (FPGAs) to improve designer productivity and ultimately, to make FPGA technology accessible to software engineers having limited hardware expertise. The hope is that down the road, software developers could use HLS to realize FPGA-based accelerators customized to applications that work in tandem with standard processors to raise computational throughput and energy efficiency. And, the further hope is that such HLS-generated accelerators operate close to the speed and energy efficiency of human-expert-designed accelerators. In this talk, I will overview the trends behind the recent drive towards FPGA HLS and why the need for, and use of, HLS will only become more pronounced in the coming years. I will argue that HLS, as opposed to traditional RTL design, is on the “right side of history”. The talk will highlight current HLS research directions and expose some of the challenges for HLS that may hinder its update in the digital design community. I will also describe work underway in the LegUp HLS project at the University of Toronto - a publicly available HLS tool that has been downloaded by over 4000 groups from around the world.