The-OpenROAD-Project/OpenROAD
Jan 2025 – Feb 2026
14 Months active
Languages Used
C++N/ATclCMakeDEFDefJavaScriptMarkdown
Technical Skills
Algorithm DesignC++Chip DesignConfiguration ManagementEDA ToolsFloorplanning
Arthur Koucher
PROFILE
Arthur Koucher
Arthur Koucher contributed to The-OpenROAD-Project/OpenROAD by engineering robust macro placement and clustering features for VLSI design automation. He developed and refactored core algorithms in C++ to improve placement accuracy, wirelength estimation, and timing analysis, integrating data structures for IO management and region constraints. Arthur enhanced the simulated annealing engine, expanded regression test coverage, and modernized the codebase with C++20 features, focusing on maintainability and performance. His work included GUI and build system improvements, as well as debugging and visualization tools, resulting in a more reliable, testable, and scalable backend for automated chip layout and timing-driven workflows.
Overall Statistics
Feature vs Bugs
72%Features
Repository Contributions
240Total
Bugs
31
Commits
240
Features
80
Lines of code
88,861
Activity Months14
Your Network
101 peopleSame Organization
@precisioninno.com14
Shared Repositories
87
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Ahmed R. MohamedMember
alokkumardalei-wqMember
andyfox-rushcMember
arthurjoloMember
arthurMember
Augusto BerndtMember
Augusto BerndtMember
Bangqi XuMember
Work History
February 2026
2 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for The-OpenROAD-Project/OpenROAD: Delivered net-focused Timing Report UI enhancements and path management, enabling focused analysis of specific nets from timing reports and improved navigation/visualization of timing paths. TimingPath improvements and streamlined TimingWidget menu actions enhance UX for timing analysis, reducing analyst effort and accelerating path validation. Code quality and maintainability were advanced via clang-tidy cleanups and code-review-driven refinements. No explicit bug fixes captured in this scope; business value delivered through faster, more reliable timing analysis and smoother developer workflow.
2 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for The-OpenROAD-Project/OpenROAD: Delivered net-focused Timing Report UI enhancements and path management, enabling focused analysis of specific nets from timing reports and improved navigation/visualization of timing paths. TimingPath improvements and streamlined TimingWidget menu actions enhance UX for timing analysis, reducing analyst effort and accelerating path validation. Code quality and maintainability were advanced via clang-tidy cleanups and code-review-driven refinements. No explicit bug fixes captured in this scope; business value delivered through faster, more reliable timing analysis and smoother developer workflow.
February 2026
January 2026
22 Commits • 7 Features
Jan 1, 2026January 2026 monthly summary for The-OpenROAD project. Delivered MPL placement improvements and safety enhancements with deterministic annealer counts, stable tiny-cluster thresholds, optional data-flow, iterator-safety and pointer-based invalidation fixes, modernization of transforms, and updated macro placement feasibility checks, supplemented by removal of the data-flow mechanism. Bazel build-system updates and resource management included removal of old Bazel sources, updated ngt45/tinyRocket metrics, added missing Bazel resources, and a bump of bazel-orfs. Tests and metrics updated to reflect MPL changes for tinyRocket and nangate45 (retired metrics removed), with golden test baselines rebaselined for C and C++ tests. Additional code quality work included Tcl/BUILD lint fixes, cleanup of object.h and object.cpp, direct inclusion of polygon_90_set_data, and improved handling of unaligned pins via an aggregate warning.
January 2026
22 Commits • 7 Features
Jan 1, 2026January 2026 monthly summary for The-OpenROAD project. Delivered MPL placement improvements and safety enhancements with deterministic annealer counts, stable tiny-cluster thresholds, optional data-flow, iterator-safety and pointer-based invalidation fixes, modernization of transforms, and updated macro placement feasibility checks, supplemented by removal of the data-flow mechanism. Bazel build-system updates and resource management included removal of old Bazel sources, updated ngt45/tinyRocket metrics, added missing Bazel resources, and a bump of bazel-orfs. Tests and metrics updated to reflect MPL changes for tinyRocket and nangate45 (retired metrics removed), with golden test baselines rebaselined for C and C++ tests. Additional code quality work included Tcl/BUILD lint fixes, cleanup of object.h and object.cpp, direct inclusion of polygon_90_set_data, and improved handling of unaligned pins via an aggregate warning.
December 2025
18 Commits • 6 Features
Dec 1, 2025December 2025 monthly summary for The-OpenROAD-Project/OpenROAD focusing on delivering robust macro-placement, refactoring for reusability, build/configurability enhancements, and stability improvements, with increased maintainability and better developer tooling.
18 Commits • 6 Features
Dec 1, 2025December 2025 monthly summary for The-OpenROAD-Project/OpenROAD focusing on delivering robust macro-placement, refactoring for reusability, build/configurability enhancements, and stability improvements, with increased maintainability and better developer tooling.
December 2025
November 2025
6 Commits • 3 Features
Nov 1, 2025Monthly summary for 2025-11 focusing on business value, technical achievements, and maintainability within The-OpenROAD-Project/OpenROAD. Highlights: key features delivered, major bugs fixed, overall impact, and the technologies demonstrated. Deliverables include design metrics improvements for TinyRocket Nangate45, optimization workflow enhancements via simulated annealing corrections, clustering threshold refinements, corrected test configurations, and C++20 modernization. These changes collectively improve design quality, reliability, and developer productivity, while reducing risk in future development cycles.
November 2025
6 Commits • 3 Features
Nov 1, 2025Monthly summary for 2025-11 focusing on business value, technical achievements, and maintainability within The-OpenROAD-Project/OpenROAD. Highlights: key features delivered, major bugs fixed, overall impact, and the technologies demonstrated. Deliverables include design metrics improvements for TinyRocket Nangate45, optimization workflow enhancements via simulated annealing corrections, clustering threshold refinements, corrected test configurations, and C++20 modernization. These changes collectively improve design quality, reliability, and developer productivity, while reducing risk in future development cycles.
October 2025
8 Commits • 6 Features
Oct 1, 2025Concise monthly summary for 2025-10 focusing on key achievements, major updates, and business impact for The-OpenROAD-Project/OpenROAD. Emphasis on code quality, debugging support, macro placement improvements, algorithm refinements, and CI/test infrastructure.
8 Commits • 6 Features
Oct 1, 2025Concise monthly summary for 2025-10 focusing on key achievements, major updates, and business impact for The-OpenROAD-Project/OpenROAD. Emphasis on code quality, debugging support, macro placement improvements, algorithm refinements, and CI/test infrastructure.
October 2025
September 2025
18 Commits • 1 Features
Sep 1, 2025In September 2025, the OpenROAD team delivered two major initiatives that enhance design reliability, testing coverage, and workflow efficiency for large-scale integrations. The work was focused on macro placement reliability and robust data-flow clustering, with a strong emphasis on regression testing and maintainability. Key features delivered: - Macro Placement Enhancements and MPL Test Framework: introduced pre-placed macro support, standardized pre_placed_macros handling, and a dedicated MPL regression test suite. Core logic and test infrastructure were refactored to improve reliability and testability of macro placement, including flow.tcl integration and technology-specific defaults. Major bugs fixed: - Clustering Engine Data Flow and Connection Robustness Fixes: addressed edge cases in data flow and clustering (bidirectional connections, self-loops, and connection management). Centralized and clarified connection logic, with safe access patterns to enhance correctness and stability when merging clusters and connecting macros. Overall impact and accomplishments: - Increased reliability of macro placement for large, real-world designs, reducing regression risk and enabling faster validation cycles. - More robust clustering and connection handling improves routing readiness and reduces chances of design-rule violations or dead-ends in flows that rely on clustering results. - Expanded regression coverage and cleaner test infrastructure, enabling deterministic test runs and easier future maintenance. Technologies and skills demonstrated: - Macro placement algorithms, regression testing, and test infrastructure refactors - Data-flow graph management, clustering logic, and robust connection strategies - Code quality improvements, deduplication efforts, and test-result maintenance
September 2025
18 Commits • 1 Features
Sep 1, 2025In September 2025, the OpenROAD team delivered two major initiatives that enhance design reliability, testing coverage, and workflow efficiency for large-scale integrations. The work was focused on macro placement reliability and robust data-flow clustering, with a strong emphasis on regression testing and maintainability. Key features delivered: - Macro Placement Enhancements and MPL Test Framework: introduced pre-placed macro support, standardized pre_placed_macros handling, and a dedicated MPL regression test suite. Core logic and test infrastructure were refactored to improve reliability and testability of macro placement, including flow.tcl integration and technology-specific defaults. Major bugs fixed: - Clustering Engine Data Flow and Connection Robustness Fixes: addressed edge cases in data flow and clustering (bidirectional connections, self-loops, and connection management). Centralized and clarified connection logic, with safe access patterns to enhance correctness and stability when merging clusters and connecting macros. Overall impact and accomplishments: - Increased reliability of macro placement for large, real-world designs, reducing regression risk and enabling faster validation cycles. - More robust clustering and connection handling improves routing readiness and reduces chances of design-rule violations or dead-ends in flows that rely on clustering results. - Expanded regression coverage and cleaner test infrastructure, enabling deterministic test runs and easier future maintenance. Technologies and skills demonstrated: - Macro placement algorithms, regression testing, and test infrastructure refactors - Data-flow graph management, clustering logic, and robust connection strategies - Code quality improvements, deduplication efforts, and test-result maintenance
August 2025
18 Commits • 4 Features
Aug 1, 2025Monthly performance summary for The-OpenROAD-Project/OpenROAD (2025-08): Delivered notable feature work to enhance debugging, visualization, and placement tooling, while hardening the core SA-based clustering engine. The month culminated in a more debuggable, faster iteration workflow and improved market-readiness of the backend for macro placement.
18 Commits • 4 Features
Aug 1, 2025Monthly performance summary for The-OpenROAD-Project/OpenROAD (2025-08): Delivered notable feature work to enhance debugging, visualization, and placement tooling, while hardening the core SA-based clustering engine. The month culminated in a more debuggable, faster iteration workflow and improved market-readiness of the backend for macro placement.
August 2025
July 2025
33 Commits • 10 Features
Jul 1, 2025Monthly performance summary for 2025-07 (The OpenROAD Project): This period delivered a combination of feature work, regression coverage, and quality improvements across IO management, data formats, and tooling. The changes strengthened IO utilization accuracy, expanded automated test coverage, and improved maintainability and stability of the codebase, supporting faster iteration and more reliable releases. Key features delivered: - IO Bundles for fixed IO pins: introduced the IO bundle concept, enabling creation and management of fixed IO bundles, associating pins by location, exposing per-pin access, and logging bundle data (including the number of IOs). IO density calculations were updated to base on the number of constrained IOs, with supporting tests. - IO Tests: added regression tests for fixed IO handling and tests covering IOs with different placement statuses to improve coverage. - DFT TCL format support: added TCL (.tcl) format support for DFT data, with regression test updates. - ODB code generator integration and iterator improvements: aligned code generator jsons to accommodate changes, implemented a new iterator with reverse logic, updated includes, and refined hash/version handling. - GUI and metadata enhancements: fixed GUI issue for negative buckets, and added descriptors for dbScanPartition and dbScanChain; improvements aimed at stability and metadata presentation. - Test infrastructure enhancements: added missing regression resources for Bazel and improved test/build stability to reduce flaky tests and speed up CI feedback. Major bugs fixed: - GUI: fixed flipped display of negative bucket values. - MPL: improved error reporting when a macro does not fit in the core MPL. - Static analysis: addressed Coverity issues and applied code quality improvements. Overall impact and accomplishments: The month’s work strengthened core IO handling and measurement accuracy, expanded automated regression coverage for IO and placement scenarios, and improved maintainability and test reliability. These gains support more predictable delivery cycles, faster validation, and clearer ownership of critical components (ODB, GUI, DFT formats, and code generation). The combined focus on quality and coverage reduces risk in upcoming integration cycles and enables more confident optimization and feature delivery. Technologies/skills demonstrated: - C++ codebase contributions across IO management, ODB, GUI, and DFT modules. - Test automation and infrastructure work, including Bazel-based builds and regression test suites. - Code quality and static analysis practices (Coverity fixes, coding standards). - Code generation and advanced iterator patterns, cross-namespace usability, and metadata descriptor enhancements. - Data/logging instrumentation and analytics for IO bundling and density calculations.
July 2025
33 Commits • 10 Features
Jul 1, 2025Monthly performance summary for 2025-07 (The OpenROAD Project): This period delivered a combination of feature work, regression coverage, and quality improvements across IO management, data formats, and tooling. The changes strengthened IO utilization accuracy, expanded automated test coverage, and improved maintainability and stability of the codebase, supporting faster iteration and more reliable releases. Key features delivered: - IO Bundles for fixed IO pins: introduced the IO bundle concept, enabling creation and management of fixed IO bundles, associating pins by location, exposing per-pin access, and logging bundle data (including the number of IOs). IO density calculations were updated to base on the number of constrained IOs, with supporting tests. - IO Tests: added regression tests for fixed IO handling and tests covering IOs with different placement statuses to improve coverage. - DFT TCL format support: added TCL (.tcl) format support for DFT data, with regression test updates. - ODB code generator integration and iterator improvements: aligned code generator jsons to accommodate changes, implemented a new iterator with reverse logic, updated includes, and refined hash/version handling. - GUI and metadata enhancements: fixed GUI issue for negative buckets, and added descriptors for dbScanPartition and dbScanChain; improvements aimed at stability and metadata presentation. - Test infrastructure enhancements: added missing regression resources for Bazel and improved test/build stability to reduce flaky tests and speed up CI feedback. Major bugs fixed: - GUI: fixed flipped display of negative bucket values. - MPL: improved error reporting when a macro does not fit in the core MPL. - Static analysis: addressed Coverity issues and applied code quality improvements. Overall impact and accomplishments: The month’s work strengthened core IO handling and measurement accuracy, expanded automated regression coverage for IO and placement scenarios, and improved maintainability and test reliability. These gains support more predictable delivery cycles, faster validation, and clearer ownership of critical components (ODB, GUI, DFT formats, and code generation). The combined focus on quality and coverage reduces risk in upcoming integration cycles and enables more confident optimization and feature delivery. Technologies/skills demonstrated: - C++ codebase contributions across IO management, ODB, GUI, and DFT modules. - Test automation and infrastructure work, including Bazel-based builds and regression test suites. - Code quality and static analysis practices (Coverity fixes, coding standards). - Code generation and advanced iterator patterns, cross-namespace usability, and metadata descriptor enhancements. - Data/logging instrumentation and analytics for IO bundling and density calculations.
June 2025
13 Commits • 4 Features
Jun 1, 2025June 2025 summary for The-OpenROAD-Project/OpenROAD: Delivered core feature enhancements, stabilized DFT workflows, and improved design insight through expanded HPWL reporting and GUI support. Macro placement accuracy and blockage modeling were enhanced with data-flow aware placement, refined blockage handling, and restructured data/graphics logic, enabling more reliable placement decisions. HPWL API now exposes total and per-net metrics for clearer wire-length analysis. DFT/Scan Enable workflow was improved with centralized setScanEnable logic and scan-chain enable creation, while a rollback fixed regressions from earlier changes to restore prior behavior. GUI enhancements added descriptors for dbScanInst to visualize bounding boxes and properties, improving debugging and review. Overall, these changes increase design quality, reduce cycle time for iterations, and strengthen testability and yield potential.
13 Commits • 4 Features
Jun 1, 2025June 2025 summary for The-OpenROAD-Project/OpenROAD: Delivered core feature enhancements, stabilized DFT workflows, and improved design insight through expanded HPWL reporting and GUI support. Macro placement accuracy and blockage modeling were enhanced with data-flow aware placement, refined blockage handling, and restructured data/graphics logic, enabling more reliable placement decisions. HPWL API now exposes total and per-net metrics for clearer wire-length analysis. DFT/Scan Enable workflow was improved with centralized setScanEnable logic and scan-chain enable creation, while a rollback fixed regressions from earlier changes to restore prior behavior. GUI enhancements added descriptors for dbScanInst to visualize bounding boxes and properties, improving debugging and review. Overall, these changes increase design quality, reduce cycle time for iterations, and strengthen testability and yield potential.
June 2025
May 2025
17 Commits • 4 Features
May 1, 2025May 2025 monthly summary for The-OpenROAD-Project/OpenROAD. The month delivered substantial advancements across wirelength estimation, placement accuracy, region handling, and tooling, driving measurable improvements in design quality and workflow efficiency. Key outcomes include more accurate placement guidance, integrated wirelength metrics for performance evaluation, improved MPL engineering practices, and strengthened debugging/test tooling. A notable bug fix further enhances design connectivity modeling when IO pads are absent, underscoring reliability in edge cases. Overall, these efforts reduce design iterations, improve yield and performance predictability, and elevate the maintainability of the OpenROAD toolchain, enabling faster, higher-quality silicon realizations. Highlights of business value include improved placement accuracy leading to better routing efficiency, earlier and more reliable performance projections, and streamlined debugging/testing workflows that accelerate design turnover and reduce risk during tapeout.
May 2025
17 Commits • 4 Features
May 1, 2025May 2025 monthly summary for The-OpenROAD-Project/OpenROAD. The month delivered substantial advancements across wirelength estimation, placement accuracy, region handling, and tooling, driving measurable improvements in design quality and workflow efficiency. Key outcomes include more accurate placement guidance, integrated wirelength metrics for performance evaluation, improved MPL engineering practices, and strengthened debugging/test tooling. A notable bug fix further enhances design connectivity modeling when IO pads are absent, underscoring reliability in edge cases. Overall, these efforts reduce design iterations, improve yield and performance predictability, and elevate the maintainability of the OpenROAD toolchain, enabling faster, higher-quality silicon realizations. Highlights of business value include improved placement accuracy leading to better routing efficiency, earlier and more reliable performance projections, and streamlined debugging/testing workflows that accelerate design turnover and reduce risk during tapeout.
April 2025
26 Commits • 14 Features
Apr 1, 2025April 2025 monthly summary for The-OpenROAD-Project/OpenROAD MPL work focused on delivering robust width-curve handling, refactoring for maintainability, and improved debugging visibility, while tightening code quality and tests to support scalable development. Overall impact: improved modeling accuracy and stability in the MPL path, enhanced data organization for cluster shapes, and a cleaner, testable codebase that supports faster iteration and future optimizations.
26 Commits • 14 Features
Apr 1, 2025April 2025 monthly summary for The-OpenROAD-Project/OpenROAD MPL work focused on delivering robust width-curve handling, refactoring for maintainability, and improved debugging visibility, while tightening code quality and tests to support scalable development. Overall impact: improved modeling accuracy and stability in the MPL path, enhanced data organization for cluster shapes, and a cleaner, testable codebase that supports faster iteration and future optimizations.
April 2025
March 2025
24 Commits • 8 Features
Mar 1, 2025March 2025 OpenROAD monthly summary highlighting delivery in the The-OpenROAD-Project/OpenROAD repo. The period focused on IO cluster WL computation, unplaced IO handling improvements, and MPL code quality, with targeted bug fixes and tests to reduce regression risk in placement and routing. Business value centers on more accurate WL/IO region handling, improved clustering stability, and maintainable code with clearer APIs and tests that prevent regressions as the design scales.
March 2025
24 Commits • 8 Features
Mar 1, 2025March 2025 OpenROAD monthly summary highlighting delivery in the The-OpenROAD-Project/OpenROAD repo. The period focused on IO cluster WL computation, unplaced IO handling improvements, and MPL code quality, with targeted bug fixes and tests to reduce regression risk in placement and routing. Business value centers on more accurate WL/IO region handling, improved clustering stability, and maintainable code with clearer APIs and tests that prevent regressions as the design scales.
February 2025
28 Commits • 10 Features
Feb 1, 2025February 2025 for The-OpenROAD-Project/OpenROAD focused on maintainability, reliability, and data readiness in the MPL module, with targeted refactors, clustering improvements, and stability fixes. Key deliverables include refactoring the MPL module to reduce duplication and improve maintainability, implementing cluster shaping using constraint regions’ shapes for unplaced I/Os to improve placement and pin blockage handling, adopting a dedicated core weights struct for clearer core creation, and fixes to dist-to-boundary computations within SA and terminal clustering. Additionally, test/docs stability improvements were delivered, including fixes for batch processing tests/docs and relocating Nangate45_io to ensure pads data is available for tests, with regression tests expanded to cover IO_PAD scenarios. These efforts reduce future maintenance costs, improve placement accuracy and debugging readability, and strengthen the overall test foundation.
28 Commits • 10 Features
Feb 1, 2025February 2025 for The-OpenROAD-Project/OpenROAD focused on maintainability, reliability, and data readiness in the MPL module, with targeted refactors, clustering improvements, and stability fixes. Key deliverables include refactoring the MPL module to reduce duplication and improve maintainability, implementing cluster shaping using constraint regions’ shapes for unplaced I/Os to improve placement and pin blockage handling, adopting a dedicated core weights struct for clearer core creation, and fixes to dist-to-boundary computations within SA and terminal clustering. Additionally, test/docs stability improvements were delivered, including fixes for batch processing tests/docs and relocating Nangate45_io to ensure pads data is available for tests, with regression tests expanded to cover IO_PAD scenarios. These efforts reduce future maintenance costs, improve placement accuracy and debugging readability, and strengthen the overall test foundation.
February 2025
January 2025
7 Commits • 2 Features
Jan 1, 2025January 2025 (2025-01) – The OpenROAD project delivered notable improvements to macro placement robustness, enhanced IO PAD handling in the mpl module, and updated floorplan reporting terminology, complemented by test configuration cleanup. These changes strengthen the place-and-route flow, improve routing fidelity around IO pads, and reduce maintenance overhead.
January 2025
7 Commits • 2 Features
Jan 1, 2025January 2025 (2025-01) – The OpenROAD project delivered notable improvements to macro placement robustness, enhanced IO PAD handling in the mpl module, and updated floorplan reporting terminology, complemented by test configuration cleanup. These changes strengthen the place-and-route flow, improve routing fidelity around IO pads, and reduce maintenance overhead.
Activity
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Quality Metrics
Correctness89.2%
Maintainability88.4%
Architecture85.0%
Performance80.8%
AI Usage21.4%
Skills & Technologies
Programming Languages
BUILDBazelC++CMakeDEFDefJSONJavaScriptMarkdownN/A
Technical Skills
API DesignAPI DevelopmentAPI ManagementAlgorithm DesignAlgorithm ImplementationAlgorithm ImprovementAlgorithm OptimizationAlgorithm optimizationBackend DevelopmentBazelBuild SystemBuild System ConfigurationBuild System ManagementBuild SystemsC++
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