grt: Implement timing-driven net sorting for incremental CUGR#9828
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Divinesoumyadip wants to merge 3 commits intoThe-OpenROAD-Project:masterfrom
Closed
grt: Implement timing-driven net sorting for incremental CUGR#9828Divinesoumyadip wants to merge 3 commits intoThe-OpenROAD-Project:masterfrom
Divinesoumyadip wants to merge 3 commits intoThe-OpenROAD-Project:masterfrom
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This PR prioritizes timing-critical nets during the incremental rerouting process. By querying fresh slack data from OpenSTA before rerouting, the tool ensures that nets with the worst negative slack (WNS) get the first choice of routing resources.
In the previous incremental flow, nets were rerouted in an arbitrary order. This often led to non-critical nets occupying the most direct tracks, forcing critical timing paths into long detours. This PR ensures that "VIP" nets (those with negative slack) are handled first to protect chip performance during ECO passes.
I modified
CUGR::rerouteNetsto refresh timing data before routing.Integrated a loop to querysta_(OpenSTA) for each net's current slack.UtilizessortNetIndicesto re-order the reroute queue so that nets with the most negative slack are at the front.Reduces timing degradation during ECO passes and improves the overall Timing Quality of Results (QoR) by prioritizing paths that define the chip's maximum clock frequency.