Add LUT+FF clustering rule

chipsalliance / python-fpga-interchange

Python interface to FPGA interchange format

ISC License

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Add LUT+FF clustering rule #165

Closed mkurc-ant closed 2 years ago

mkurc-ant commented 2 years ago

This PR adds additional clustering rules for xc7 and xcup devices. The rules allow nextpnr to pack together LUTs and flip-flops which leads to SA placer runtime reduction.