feat: add C++ port of STA CLI pipeline (cppver/)#2
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Reimplements the main.py CLI path (liberty parsing, timing graph construction, delay/slack propagation) in C++17, organized into domain modules (liberty, constraints, placement, ranking, netlist, graph, sta) each with a matching sub-namespace. Verified to produce identical TNS/WNS/critical-path output to the Python version. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Cache each cell TimingArc's resolved TimingArcDef pointer at graph-build time so calculate_node() no longer rebuilds a string key and hashes into CellInfo::timing_arcs on every fanin arc; falls back to the by-key lookup only for resizable nodes. Add graph::levelize() to group the topo order into dependency-free levels, and walk calculate_delay()'s forward pass level by level, marking the loop boundary a future parallel/GPU dispatch would split on. Document both in ARCHITECTURE.md along with what a real CUDA/Metal port would still need (CSR-style flattening of the graph). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Summary
main.pySTA CLI pipeline in C++17 (cppver/) — liberty parsing, timing graph construction, and delay/slack propagation — organized into domain modules (liberty, constraints, placement, ranking, netlist, graph, sta), each with a matching sub-namespace. Verified to produce identical TNS/WNS/critical-path output to the Python version.cppver/ARCHITECTURE.mddocumenting the module layout and dataflow through the pipeline.TimingArc's resolvedTimingArcDefpointer at graph-build time (avoiding a string-key rebuild + hash lookup intoCellInfo::timing_arcsper fanin arc on everycalculate_node()call, falling back to by-key lookup only for resizable nodes), and addsgraph::levelize()to group the topo order into dependency-free levels socalculate_delay()'s forward pass walks level by level — marking where a future parallel/GPU dispatch would split. Documents what a real CUDA/Metal port would additionally need (CSR-style flattening of the graph).Test plan
cppver/via CMake and confirm it compiles cleanlycppver/run.sh(or the built binary) against a sample netlist/liberty/SDC set and diff TNS/WNS/critical-path output against the Pythonmain.pyresultgraph::levelize()output ordering matches the original topo order's dependency constraints🤖 Generated with Claude Code