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P6-02: Add rank-anchored connectivity compaction for semantic placement #31

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opened 2026-02-19 14:19:07 -05:00 by Rbanh · 1 comment
Rbanh commented 2026-02-19 14:19:07 -05:00
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Objective

Improve readability by compacting connected components while preserving logical left-to-right flow.

Scope

  • Add connectivity graph weighted by net class.
  • Apply iterative compaction with rank-column anchoring and lane bias.
  • Maintain respect for locked placements and deterministic output.

Acceptance Criteria

  • Related nodes move closer without collapsing into one column.
  • Signal flow remains visually directional and coherent.
  • Compile metrics remain within quality budgets.
## Objective Improve readability by compacting connected components while preserving logical left-to-right flow. ## Scope - Add connectivity graph weighted by net class. - Apply iterative compaction with rank-column anchoring and lane bias. - Maintain respect for locked placements and deterministic output. ## Acceptance Criteria - Related nodes move closer without collapsing into one column. - Signal flow remains visually directional and coherent. - Compile metrics remain within quality budgets.
Rbanh added this to the Phase 6 - Layout Coherence and Readability Stabilization milestone 2026-02-19 14:19:23 -05:00
Rbanh commented 2026-02-19 14:20:13 -05:00
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Delivered in commit 47fabe6.

Implemented:

  • Added weighted connectivity graph from net topology.
  • Added iterative compaction pass with rank-column anchoring + lane bias.
  • Integrated compaction into placement flow before constraint/near/overlap finalization.

Outcome:

  • Components are more locally coherent while preserving left-to-right semantic flow.
  • Reduced outlier scatter and perimeter-routing tendency in sample scene.
Delivered in commit `47fabe6`. Implemented: - Added weighted connectivity graph from net topology. - Added iterative compaction pass with rank-column anchoring + lane bias. - Integrated compaction into placement flow before constraint/near/overlap finalization. Outcome: - Components are more locally coherent while preserving left-to-right semantic flow. - Reduced outlier scatter and perimeter-routing tendency in sample scene.
Rbanh closed this issue 2026-02-19 14:20:29 -05:00
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Reference: Rbanh/schemeta#31
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