antmicro/verilator
Jul 2025 – Feb 2026
7 Months active
Languages Used
C++PythonVerilogSystemVerilog
Technical Skills
C++C++ DevelopmentCode AnalysisCode RefactoringCompiler DevelopmentPython Scripting
Igor Zaworski
PROFILE
Igor Zaworski
Izaworski contributed to the antmicro/verilator repository by developing and refining core features for Verilog and SystemVerilog simulation, focusing on correctness, reliability, and maintainability. Over seven months, they enhanced virtual interface handling, improved constraint randomization, and introduced robust type and symbol resolution mechanisms. Their work involved deep C++ development, AST manipulation, and Python scripting to implement new language features, optimize code generation, and expand regression test coverage. By addressing complex issues such as circular type detection, memory safety, and dynamic scheduling, Izaworski delivered solutions that improved simulation accuracy and reduced regression risk, demonstrating strong technical depth in compiler and verification toolchains.
Overall Statistics
Feature vs Bugs
47%Features
Repository Contributions
22Total
Bugs
8
Commits
22
Features
7
Lines of code
4,806
Activity Months7
Your Network
83 peopleSame Organization
@internships.antmicro.com8
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Work History
February 2026
2 Commits
Feb 1, 2026February 2026: Focused on stabilizing Verilator simulation reliability in the antmicro/verilator repository. Delivered targeted fixes to internal virtual interface handling and derived constraint integrity, reducing simulation errors and improving robustness in randomized verification scenarios. The changes emphasize correctness in interface detection and constraint propagation without introducing performance regressions, enabling more dependable verification workflows for complex designs.
2 Commits
Feb 1, 2026February 2026: Focused on stabilizing Verilator simulation reliability in the antmicro/verilator repository. Delivered targeted fixes to internal virtual interface handling and derived constraint integrity, reducing simulation errors and improving robustness in randomized verification scenarios. The changes emphasize correctness in interface detection and constraint propagation without introducing performance regressions, enabling more dependable verification workflows for complex designs.
February 2026
January 2026
2 Commits • 2 Features
Jan 1, 2026January 2026 (2026-01) performance summary for antmicro/verilator. Focused on two high-impact feature enhancements: (1) Virtual Interfaces Handling Enhancement to improve reliability and correctness when interacting with virtual interfaces; (2) Dynamic Scheduler Variable Localization Enhancement to improve correctness of temporary variable scoping in the dynamic scheduler, with corresponding test coverage. These efforts reduce regression risk in core simulation paths and improve maintainability of the codebase as new virtual interfaces and dynamic scheduling scenarios are introduced.
January 2026
2 Commits • 2 Features
Jan 1, 2026January 2026 (2026-01) performance summary for antmicro/verilator. Focused on two high-impact feature enhancements: (1) Virtual Interfaces Handling Enhancement to improve reliability and correctness when interacting with virtual interfaces; (2) Dynamic Scheduler Variable Localization Enhancement to improve correctness of temporary variable scoping in the dynamic scheduler, with corresponding test coverage. These efforts reduce regression risk in core simulation paths and improve maintainability of the codebase as new virtual interfaces and dynamic scheduling scenarios are introduced.
November 2025
1 Commits
Nov 1, 2025November 2025 monthly summary for antmicro/verilator: Focused on improving memory safety and correctness in the V3Randomize path. No new user-facing features were delivered this month; the primary effort was a critical bug fix to ensure safe deletion of linked nodes. The patch reduces risk of dangling pointers and memory corruption, contributing to more reliable simulation behavior and easier future maintenance.
1 Commits
Nov 1, 2025November 2025 monthly summary for antmicro/verilator: Focused on improving memory safety and correctness in the V3Randomize path. No new user-facing features were delivered this month; the primary effort was a critical bug fix to ensure safe deletion of linked nodes. The patch reduces risk of dangling pointers and memory corruption, contributing to more reliable simulation behavior and easier future maintenance.
November 2025
October 2025
5 Commits • 3 Features
Oct 1, 2025October 2025 monthly summary for antmicro/verilator: Delivered key feature work focused on robust typedef handling, safer Verilog processing, and an enabling optimization surface. The changes improve typing reliability, correctness of simulation, and opportunities for performance gains through targeted caching and a new pure-expression annotation.
October 2025
5 Commits • 3 Features
Oct 1, 2025October 2025 monthly summary for antmicro/verilator: Delivered key feature work focused on robust typedef handling, safer Verilog processing, and an enabling optimization surface. The changes improve typing reliability, correctness of simulation, and opportunities for performance gains through targeted caching and a new pure-expression annotation.
September 2025
2 Commits
Sep 1, 2025Month: 2025-09. Summary of contributions to antmicro/verilator: Implemented Verilog correctness fixes focusing on constraint randomization and side-effect handling, and added regression tests to protect correctness. These changes improve simulation accuracy for constrained-random verification and reduce flaky behavior in select operations. Delivered across two commits (4070db99902f148e32ee349259021dcac55a6ae0, 83f4db956b2be8f79d57e47640ef1cea1186ac00).
2 Commits
Sep 1, 2025Month: 2025-09. Summary of contributions to antmicro/verilator: Implemented Verilog correctness fixes focusing on constraint randomization and side-effect handling, and added regression tests to protect correctness. These changes improve simulation accuracy for constrained-random verification and reduce flaky behavior in select operations. Delivered across two commits (4070db99902f148e32ee349259021dcac55a6ae0, 83f4db956b2be8f79d57e47640ef1cea1186ac00).
September 2025
August 2025
6 Commits • 2 Features
Aug 1, 2025August 2025 (antmicro/verilator): 6 changes across 4 bug fixes and 2 feature additions, delivering stronger correctness, broader Verilog support, and more reliable constraints. All changes included regression tests to reduce reoccurrence and improve maintainability.
August 2025
6 Commits • 2 Features
Aug 1, 2025August 2025 (antmicro/verilator): 6 changes across 4 bug fixes and 2 feature additions, delivering stronger correctness, broader Verilog support, and more reliable constraints. All changes included regression tests to reduce reoccurrence and improve maintainability.
July 2025
4 Commits
Jul 1, 2025July 2025: Verilator stability and correctness improvements across coverage-expr handling, symbol resolution, and type linking. Implemented targeted bug fixes with tests, enhancing robustness of coverage analysis and overall build reliability.
4 Commits
Jul 1, 2025July 2025: Verilator stability and correctness improvements across coverage-expr handling, symbol resolution, and type linking. Implemented targeted bug fixes with tests, enhancing robustness of coverage analysis and overall build reliability.
July 2025
Activity
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Quality Metrics
Correctness91.8%
Maintainability82.8%
Architecture83.2%
Performance77.2%
AI Usage21.8%
Skills & Technologies
Programming Languages
C++PythonSystemVerilogVerilog
Technical Skills
AST ManipulationC++C++ DevelopmentC++ developmentCode AnalysisCode GenerationCode OptimizationCode RefactoringCompiler DesignCompiler DevelopmentConstraint RandomizationDocumentationPython ScriptingPython scriptingRefactoring
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