antmicro/verilator
Dec 2025 – Feb 2026
3 Months active
Languages Used
C++PythonSystemVerilogVerilogCYacc
Technical Skills
C++ developmentC++ programmingSystemVerilogVerilog simulationconstraint programminghardware description languages
Pawel Kojma
PROFILE
Pawel Kojma
During a three-month period, Piotr Kojma contributed to the antmicro/verilator repository by developing and refining features that enhance hardware verification workflows. He improved Verilator’s constraint system, adding support for signed multiplication and ‘or’ constraints, and enforced stricter identifier validation to prevent errors in constraint modeling. Using C++ and SystemVerilog, Piotr expanded test coverage for edge cases such as unpacked array handling and nested class constraints, while also addressing reliability issues like segmentation faults and IEEE-compliant clocking block sampling. His work demonstrated depth in debugging, parsing, and test-driven development, resulting in more robust, predictable, and maintainable simulation and synthesis behavior.
Overall Statistics
Feature vs Bugs
63%Features
Repository Contributions
9Total
Bugs
3
Commits
9
Features
5
Lines of code
709
Activity Months3
Your Network
83 peopleSame Organization
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Work History
February 2026
2 Commits • 1 Features
Feb 1, 2026February 2026 (antmicro/verilator): Delivered targeted enhancements to the constraint system and improved test coverage, focused on increasing modeling fidelity and correctness with minimal risk to existing behavior. Key features delivered: 1) Signed multiplication support in constraints, enabling accurate modeling of signed arithmetic in constraints. 2) Constraint identifier validation that enforces usage of class member variables only, preventing non-member identifiers in constraints. 3) Expanded test coverage for signed-integer constraints and nested class constraints in the Verilator simulator. Major commits: 9a8538fafa4981282dea4b2f9013a7b42b39fe70 (Support signed multiplication in constraints, #7008) and 5d12ae3a2f64baad1f2b1a192f22b52e0ada7738 (Fix non-member identifiers used inside constraints, #7033). Impact: improves modeling fidelity and reliability of the constraint system; reduces debugging time for users modeling signed arithmetic; strengthens test suite, enabling safer refactors. Technologies/skills: C++, Verilog/SystemVerilog constraints, test-driven development, git-based workflow, code review.
2 Commits • 1 Features
Feb 1, 2026February 2026 (antmicro/verilator): Delivered targeted enhancements to the constraint system and improved test coverage, focused on increasing modeling fidelity and correctness with minimal risk to existing behavior. Key features delivered: 1) Signed multiplication support in constraints, enabling accurate modeling of signed arithmetic in constraints. 2) Constraint identifier validation that enforces usage of class member variables only, preventing non-member identifiers in constraints. 3) Expanded test coverage for signed-integer constraints and nested class constraints in the Verilator simulator. Major commits: 9a8538fafa4981282dea4b2f9013a7b42b39fe70 (Support signed multiplication in constraints, #7008) and 5d12ae3a2f64baad1f2b1a192f22b52e0ada7738 (Fix non-member identifiers used inside constraints, #7033). Impact: improves modeling fidelity and reliability of the constraint system; reduces debugging time for users modeling signed arithmetic; strengthens test suite, enabling safer refactors. Technologies/skills: C++, Verilog/SystemVerilog constraints, test-driven development, git-based workflow, code review.
February 2026
January 2026
5 Commits • 3 Features
Jan 1, 2026January 2026 monthly summary for antmicro/verilator: Delivered core feature and reliability improvements including unpacked array handling in function arguments, enhanced constraint parsing, coverpoint identifier parsing, and a segmentation fault fix in V3Slice. Implemented robust tests, improved error handling, and increased coverage to reduce regressions. Business value: more predictable synthesis & simulation behavior, stronger constraint validation, richer coverage analytics, and higher overall stability.
January 2026
5 Commits • 3 Features
Jan 1, 2026January 2026 monthly summary for antmicro/verilator: Delivered core feature and reliability improvements including unpacked array handling in function arguments, enhanced constraint parsing, coverpoint identifier parsing, and a segmentation fault fix in V3Slice. Implemented robust tests, improved error handling, and increased coverage to reduce regressions. Business value: more predictable synthesis & simulation behavior, stronger constraint validation, richer coverage analytics, and higher overall stability.
December 2025
2 Commits • 1 Features
Dec 1, 2025December 2025: Focused on reliability and flexibility improvements in Verilator within antmicro/verilator. Delivered an IEEE-compliant clocking block input sampling fix, expanded test coverage, and introduced support for 'or' constraints in the randomization engine. These changes strengthen test determinism, broaden constraint expressiveness, and reduce risk in hardware verification flows.
2 Commits • 1 Features
Dec 1, 2025December 2025: Focused on reliability and flexibility improvements in Verilator within antmicro/verilator. Delivered an IEEE-compliant clocking block input sampling fix, expanded test coverage, and introduced support for 'or' constraints in the randomization engine. These changes strengthen test determinism, broaden constraint expressiveness, and reduce risk in hardware verification flows.
December 2025
Activity
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Quality Metrics
Correctness84.4%
Maintainability80.0%
Architecture80.0%
Performance80.0%
AI Usage26.6%
Skills & Technologies
Programming Languages
CC++PythonSystemVerilogVerilogYacc
Technical Skills
C++C++ developmentC++ programmingDebuggingPython scriptingSoftware testingSystemVerilogTesting and validationVerilogVerilog designVerilog simulationVerilog testingcompiler designconstraint programminghardware description languages
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