YosysHQ/yosys
Feb 2025 – Apr 2025
3 Months active
Languages Used
C++SystemVerilogTclVerilog
Technical Skills
Compiler DevelopmentDigital DesignHardware Description Language (HDL) SynthesisHardware Description LanguageSynthesisTest Driven Development
Kelvin Chung
PROFILE
Kelvin Chung
King Chung contributed to the YosysHQ/yosys repository by developing and enhancing constant mapping features within the HDL synthesis flow. Over three months, he built the hilomap and constmap passes, enabling modular handling of multi-bit constants by introducing dedicated cells and parameter storage. Using C++, Verilog, and Yosys scripting, he refactored existing logic to improve maintainability and test coverage, consolidating tests and adding validation checks for cell creation. His work focused on increasing design flexibility, reducing manual intervention, and ensuring correctness in constant handling, demonstrating depth in compiler development, digital design, and test-driven development practices within complex synthesis workflows.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
5Total
Bugs
0
Commits
5
Features
3
Lines of code
312
Activity Months3
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Work History
April 2025
2 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for YosysHQ/yosys: Strengthened the Constmap pass with robustness improvements, including refactored structure naming, expanded test coverage for constant mappings (values 16 and 32), and added pre-create validation checks for cell type, port, and parameter existence. No major bugs fixed this month; focus was on feature robustness, test consolidation, and reducing future risk through validation and enhanced tests. Commits documented: 414dc855730ce27b1b49bc50cc97ef4240b42ad4 and 81f3369f248f84eeb81aa3a4b32ef93f32937ca8.
2 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for YosysHQ/yosys: Strengthened the Constmap pass with robustness improvements, including refactored structure naming, expanded test coverage for constant mappings (values 16 and 32), and added pre-create validation checks for cell type, port, and parameter existence. No major bugs fixed this month; focus was on feature robustness, test consolidation, and reducing future risk through validation and enhanced tests. Commits documented: 414dc855730ce27b1b49bc50cc97ef4240b42ad4 and 81f3369f248f84eeb81aa3a4b32ef93f32937ca8.
April 2025
March 2025
2 Commits • 1 Features
Mar 1, 2025March 2025: Delivered a new constmap pass for Yosys HDL synthesis that maps constant values to specific driver cells, with a focused refactor of hilomap to remove multi-bit constant handling now covered by constmap. Implemented and extended tests to verify the new behavior. This work simplifies constant handling in the HDL synthesis pipeline, improves correctness, and enhances maintainability and future extensibility of the const handling path, contributing to more predictable resource usage in generated hardware.
March 2025
2 Commits • 1 Features
Mar 1, 2025March 2025: Delivered a new constmap pass for Yosys HDL synthesis that maps constant values to specific driver cells, with a focused refactor of hilomap to remove multi-bit constant handling now covered by constmap. Implemented and extended tests to verify the new behavior. This work simplifies constant handling in the HDL synthesis pipeline, improves correctness, and enhances maintainability and future extensibility of the const handling path, contributing to more predictable resource usage in generated hardware.
February 2025
1 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for YosysHQ/yosys: Delivered a major enhancement to the hilomap pass by enabling full constant wrapping for multi-bit signals. This involved replacing constant signals with a dedicated cell and storing the constant value as a parameter, increasing flexibility and enabling modular, parameterized designs. The change is captured in commit 1113c8c95a568740497d2a5f5497d1d3b592a2c9 with the message 'feat: Allow full constant wrapping for hilomap'. This work improves design reuse, reduces manual edits, and lays groundwork for more robust constant handling in synthesis mappings. Focused on business value: supports more scalable mapping of constants in hardware designs and reduces engineering toil in complex bit-width scenarios.
1 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for YosysHQ/yosys: Delivered a major enhancement to the hilomap pass by enabling full constant wrapping for multi-bit signals. This involved replacing constant signals with a dedicated cell and storing the constant value as a parameter, increasing flexibility and enabling modular, parameterized designs. The change is captured in commit 1113c8c95a568740497d2a5f5497d1d3b592a2c9 with the message 'feat: Allow full constant wrapping for hilomap'. This work improves design reuse, reduces manual edits, and lays groundwork for more robust constant handling in synthesis mappings. Focused on business value: supports more scalable mapping of constants in hardware designs and reduces engineering toil in complex bit-width scenarios.
February 2025
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Quality Metrics
Correctness88.0%
Maintainability80.0%
Architecture80.0%
Performance72.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++SystemVerilogTclVerilog
Technical Skills
Build SystemsC++ DevelopmentCompiler DesignCompiler DevelopmentDigital DesignHardware Description LanguageHardware Description Language (HDL)Hardware Description Language (HDL) SynthesisSoftware TestingSynthesisTest Driven DevelopmentTest-Driven DevelopmentVerilogYosys Scripting
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