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arXiv · 2406.02651

RoutePlacer: An End-to-End Routability-Aware Placer with Graph Neural Network

Yunbo Hou·Haoran Ye·Yingxue Zhang·Siyuan Xu·Guojie Song
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Abstract

Placement is a critical and challenging step of modern chip design, with routability being an essential indicator of placement quality. Current routability-oriented placers typically apply an iterative two-stage approach, wherein the first stage generates a placement solution, and the second stage provides non-differentiable routing results to heuristically improve the solution quality. This method hinders jointly optimizing the routability aspect during placement. To address this problem, this work introduces RoutePlacer, an end-to-end routability-aware placement method. It trains RouteGNN, a customized graph neural network, to efficiently and accurately predict routability by capturing and fusing geometric and topological representations of placements. Well-trained RouteGNN then serves as a differentiable approximation of routability, enabling end-to-end gradient-based routability optimization. In addition, RouteGNN can improve two-stage placers as a plug-and-play alternative to external routers. Our experiments on DREAMPlace, an open-source AI4EDA platform, show that RoutePlacer can reduce Total Overflow by up to 16% while maintaining routed wirelength, compared to the state-of-the-art; integrating RouteGNN within two-stage placers leads to a 44% reduction in Total Overflow without compromising wirelength.

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Yunbo Hou, Haoran Ye, Yingxue Zhang, Siyuan Xu, Guojie Song. 2024-06-04. RoutePlacer: An End-to-End Routability-Aware Placer with Graph Neural Network. https://arxiv.org/abs/2406.02651

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