llvm/circt
Mar 2026 – Jun 2026
4 Months active
Languages Used
C++SystemVerilog
Technical Skills
C++C++ developmentMLIRbackend developmentcompiler designhardware description languages
Hailong Sun
PROFILE
Hailong Sun
Worked on the llvm/circt repository over four months, delivering seven features and two bug fixes focused on compiler infrastructure for hardware description languages. Developed enhancements for Verilog and SystemVerilog import paths, including semantic analysis for assignment legality, dynamic string formatting, and expanded support for built-in string methods. Leveraged C++, MLIR, and SystemVerilog to implement robust IR lowering strategies, improve type safety, and enable expressive hardware modeling. Emphasized test-driven development and compatibility, addressing crash risks and import correctness. The work deepened CIRCT’s simulation and code generation capabilities, reducing boilerplate and supporting more reliable, efficient hardware design and verification workflows.
Overall Statistics
Feature vs Bugs
78%Features
Repository Contributions
10Total
Bugs
2
Commits
10
Features
7
Lines of code
1,317
Activity Months4
Your Network
86 peopleWork History
June 2026
1 Commits • 1 Features
Jun 1, 2026June 2026 — llvm/circt: Delivered SystemVerilog string enhancements by introducing moore.string.* built-in methods, expanding string manipulation capabilities (compare, icompare, substr, atoi, atohex, atooct, atobin, atoreal) and in-place updates (putc, itoa, hextoa, octtoa, bintoa, realtoa). Lowerings were implemented so result-producing methods are lowered as expressions, while in-place update methods are lowered as statements using a !moore.ref<string> receiver. This work is tied to commit 13b9dadea50bf4daa63cd14df9546271f84fcedd and advances CIRCT SV front-end capabilities. No major bugs fixed this month. Overall impact: richer SV string API, reduced boilerplate, and improved modeling and codegen opportunities; Technologies demonstrated: SystemVerilog front-end, CIRCT moore dialect, IR lowering, commit-driven development.
1 Commits • 1 Features
Jun 1, 2026June 2026 — llvm/circt: Delivered SystemVerilog string enhancements by introducing moore.string.* built-in methods, expanding string manipulation capabilities (compare, icompare, substr, atoi, atohex, atooct, atobin, atoreal) and in-place updates (putc, itoa, hextoa, octtoa, bintoa, realtoa). Lowerings were implemented so result-producing methods are lowered as expressions, while in-place update methods are lowered as statements using a !moore.ref<string> receiver. This work is tied to commit 13b9dadea50bf4daa63cd14df9546271f84fcedd and advances CIRCT SV front-end capabilities. No major bugs fixed this month. Overall impact: richer SV string API, reduced boilerplate, and improved modeling and codegen opportunities; Technologies demonstrated: SystemVerilog front-end, CIRCT moore dialect, IR lowering, commit-driven development.
June 2026
May 2026
2 Commits • 1 Features
May 1, 2026In May 2026, delivered core enhancements to CIRCT's simulation and import pipelines, improving dynamic string handling, compatibility, and Verilog import correctness. The work strengthens simulation fidelity, streamlines migrations, and aligns with project milestones and downstream integration.
May 2026
2 Commits • 1 Features
May 1, 2026In May 2026, delivered core enhancements to CIRCT's simulation and import pipelines, improving dynamic string handling, compatibility, and Verilog import correctness. The work strengthens simulation fidelity, streamlines migrations, and aligns with project milestones and downstream integration.
April 2026
3 Commits • 3 Features
Apr 1, 2026Month: 2026-04 for llvm/circt. Delivered targeted features and reliability improvements that expand Verilog translation, enhance import robustness, and enable safer type conversions—driving higher hardware design expressiveness and reduced engineering friction. Key features delivered include Verilog case-inside translation support with convertInsideCheck, ImportVerilog enhancement for string variables as arguments in $display, and Moore language static $cast with fallible conversions for Verilog imports. These changes collectively improve coverage of complex conditional logic, fix import-time formatting edge cases, and strengthen type-safety in Verilog imports, accelerating integration and deployment of hardware descriptions. Commits linked: aa64173de3527d20799c50bf9adadce51fd315d9; 118d1a3d855c442dcbd9c7dfe0705c1adc806d58; 7e3b70ba73ae6008171889bf9aa5e4ee8e069d76.
3 Commits • 3 Features
Apr 1, 2026Month: 2026-04 for llvm/circt. Delivered targeted features and reliability improvements that expand Verilog translation, enhance import robustness, and enable safer type conversions—driving higher hardware design expressiveness and reduced engineering friction. Key features delivered include Verilog case-inside translation support with convertInsideCheck, ImportVerilog enhancement for string variables as arguments in $display, and Moore language static $cast with fallible conversions for Verilog imports. These changes collectively improve coverage of complex conditional logic, fix import-time formatting edge cases, and strengthen type-safety in Verilog imports, accelerating integration and deployment of hardware descriptions. Commits linked: aa64173de3527d20799c50bf9adadce51fd315d9; 118d1a3d855c442dcbd9c7dfe0705c1adc806d58; 7e3b70ba73ae6008171889bf9aa5e4ee8e069d76.
April 2026
March 2026
4 Commits • 2 Features
Mar 1, 2026March 2026 (2026-03) delivered stability and correctness improvements in the Circt Verilog import path and expanded Moore dialect lowering, focusing on reducing crash risk, enforcing language legality, and enabling more efficient code generation. Key outcomes include semantic analysis enhancements for Verilog variable assignments, safer IR generation for parameterized interfaces, and a more flexible conversion lowering for Moore real values.
March 2026
4 Commits • 2 Features
Mar 1, 2026March 2026 (2026-03) delivered stability and correctness improvements in the Circt Verilog import path and expanded Moore dialect lowering, focusing on reducing crash risk, enforcing language legality, and enabling more efficient code generation. Key outcomes include semantic analysis enhancements for Verilog variable assignments, safer IR generation for parameterized interfaces, and a more flexible conversion lowering for Moore real values.
Activity
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Quality Metrics
Correctness92.0%
Maintainability82.0%
Architecture86.0%
Performance82.0%
AI Usage32.0%
Skills & Technologies
Programming Languages
C++SystemVerilog
Technical Skills
C++C++ developmentCompiler DesignMLIRSystemVerilogbackend developmentcompiler designhardware description languagessemantic analysistest-driven developmenttype systems
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