Register relocation to optimize clock network for multi-domain clock skew scheduling

Multi-domain clock skew scheduling provides performance improvement for circuits in an efficient way. However, the cost of clock network construction could be further reduced when clock scheduling scheme is considered during placement. Here we focus on this and propose an incremental register relocation algorithm to minimize the distance to the nearby ones in the same skew domain, while registers are relocated within their permissible displacement range so as not to violate timing constraints. The experiments showed our method achieved a significant cost reduction in clock networks, which did NOT rely on any specified clock structures and was applicable to general clock constructions.