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arXiv · 2401.12343

Subgraph Extraction-based Feedback-guided Iterative Scheduling for HLS

Hanchen Ye·David Z. Pan·Chris Leary·Deming Chen·Xiaoqing Xu
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Abstract

This paper proposes ISDC, a novel feedback-guided iterative system of difference constraints (SDC) scheduling algorithm for high-level synthesis (HLS). ISDC leverages subgraph extraction-based low-level feedback from downstream tools like logic synthesizers to iteratively refine HLS scheduling. Technical innovations include: (1) An enhanced SDC formulation that effectively integrates low-level feedback into the linear-programming (LP) problem; (2) A fanout and window-based subgraph extraction mechanism driving the feedback cycle; (3) A no-human-in-loop ISDC flow compatible with a wide range of downstream tools and process design kits (PDKs). Evaluation shows that ISDC reduces register usage by 28.5% against an industrial-strength open-source HLS tool.

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Hanchen Ye, David Z. Pan, Chris Leary, Deming Chen, Xiaoqing Xu. 2024-01-22. Subgraph Extraction-based Feedback-guided Iterative Scheduling for HLS. https://arxiv.org/abs/2401.12343

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