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Drew Lewis

PROFILE

Drew Lewis

Over four months, Cannada contributed to YosysHQ/yosys and The-OpenROAD-Project/OpenROAD, focusing on performance, maintainability, and reliability in C++ system software. In YosysHQ/yosys, Cannada optimized string handling and IdString indexing, reducing memory allocations and improving synthesis speed for large designs. Within OpenROAD, Cannada refactored placement logic to cache site data, centralized stdout suppression into a reusable library with robust test coverage, and fixed non-determinism in the Resizer component to stabilize CI. The work combined C++ development, build system configuration, and algorithm optimization, delivering cleaner, more maintainable code and improving cross-platform consistency in complex EDA workflows.

Overall Statistics

Feature vs Bugs

80%Features

Repository Contributions

19Total
Bugs
1
Commits
19
Features
4
Lines of code
641
Activity Months4

Work History

December 2025

4 Commits • 1 Features

Dec 1, 2025

Monthly summary for 2025-12: Focused delivery and quality improvements in The-OpenROAD-Project/OpenROAD. Key outcomes include stabilizing the Resizer component to remove non-determinism across platforms, improving CI reliability, and delivering targeted code quality refactors with sorting enhancements that improve readability, maintainability, and future performance.

October 2025

12 Commits • 1 Features

Oct 1, 2025

October 2025 monthly summary for The-OpenROAD-Project/OpenROAD focused on improving runtime safety, maintainability, and reusability by centralizing stdout suppression logic into a reusable library and ensuring robust test coverage. The work established a clean, reusable AbcLibrary-integrated foundation for stdout control, enabling consistent behavior across components and reducing future risk from ad hoc suppression. Alongside this feature work, multiple quality improvements were delivered to the SuppressStdout path and surrounding build/test infrastructure.

September 2025

1 Commits • 1 Features

Sep 1, 2025

September 2025 monthly summary for The-OpenROAD-Project/OpenROAD. Delivered a targeted performance optimization in the placement path by refactoring checkPixels in Place.cpp to cache site information, reducing redundant site data lookups and clarifying loop logic. No major bug fixes recorded this month; focus was on delivering a high-value feature with clear maintainability gains. This work demonstrates proficiency in C++ refactoring, loop optimization, and cache-friendly design, contributing to faster OpenROAD placements and lower CPU usage.

July 2025

2 Commits • 1 Features

Jul 1, 2025

July 2025 — YosysHQ/yosys: Implemented targeted performance optimizations in string handling and IdString indexing within the flattening pass, delivering faster synthesis through reduced allocations and more efficient hashing. Replaced a dict<char*, int> with std::unordered_map<std::string_view, int> for IdString::global_id_index_, enabling faster hashing and avoiding unnecessary iteration. These changes improve throughput on large designs and reduce memory churn, strengthening yosys as a scalable open-source synthesis solution.

Activity

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Quality Metrics

Correctness93.8%
Maintainability91.6%
Architecture88.4%
Performance90.6%
AI Usage20.0%

Skills & Technologies

Programming Languages

BUILDC++Shell

Technical Skills

Build System ConfigurationC++C++ DevelopmentC++ developmentCode CleanupCode DocumentationCode FormattingCode QualityCode RefactoringCross-platform DevelopmentData StructuresError HandlingFile I/OHeader Guard ImplementationHeader Management

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

The-OpenROAD-Project/OpenROAD

Sep 2025 Dec 2025
3 Months active

Languages Used

C++BUILDShell

Technical Skills

C++ DevelopmentCode RefactoringBuild System ConfigurationC++Code CleanupCode Documentation

YosysHQ/yosys

Jul 2025 Jul 2025
1 Month active

Languages Used

C++

Technical Skills

C++C++ DevelopmentData StructuresPerformance OptimizationString Manipulation