openjdk/leyden
Dec 2025 – Jan 2026
2 Months active
Languages Used
C++Java
Technical Skills
C++ developmentJava developmentalgorithm optimizationcompiler designJavatesting
Tobias Hotz
PROFILE
Tobias Hotz
Worked on the openjdk/leyden repository to improve the reliability and correctness of compiler optimizations in Java and C++. Focused on enhancing the Leyden compiler’s intermediate representation by refining the Value() method for division nodes, ensuring accurate handling of non-constant divisors and reducing numerical errors during code generation. Addressed a division-by-zero issue in the IntegerDivValueTests, which previously caused test failures during constant folding, thereby increasing the stability of continuous integration pipelines. Demonstrated expertise in compiler design, algorithm optimization, and testing, contributing targeted bug fixes that strengthened both the optimization path and the robustness of the Leyden test suite.
Overall Statistics
Feature vs Bugs
0%Features
Repository Contributions
2Total
Bugs
2
Commits
2
Features
0
Lines of code
743
Activity Months2
Your Network
305 peopleWork History
January 2026
1 Commits
Jan 1, 2026January 2026 — openjdk/leyden: Focused on hardening the Leyden test suite to improve reliability of the compiler optimization path. The primary effort resolved a division-by-zero issue in IntegerDivValueTests during constant folding, which previously triggered ArithmeticException during test execution. The fix enhances CI stability and supports safer progress on performance-related compiler work.
1 Commits
Jan 1, 2026January 2026 — openjdk/leyden: Focused on hardening the Leyden test suite to improve reliability of the compiler optimization path. The primary effort resolved a division-by-zero issue in IntegerDivValueTests during constant folding, which previously triggered ArithmeticException during test execution. The fix enhances CI stability and supports safer progress on performance-related compiler work.
January 2026
December 2025
1 Commits
Dec 1, 2025Implemented division accuracy improvements in the Leyden compiler IR by enhancing Value() for DivI and DivL to properly handle non-constant divisor inputs. This change reduces numerical errors in the C2-based IR, improving the correctness of division operations during optimization and code generation.
December 2025
1 Commits
Dec 1, 2025Implemented division accuracy improvements in the Leyden compiler IR by enhancing Value() for DivI and DivL to properly handle non-constant divisor inputs. This change reduces numerical errors in the C2-based IR, improving the correctness of division operations during optimization and code generation.
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Quality Metrics
Correctness100.0%
Maintainability90.0%
Architecture100.0%
Performance90.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++Java
Technical Skills
C++ developmentJavaJava developmentalgorithm optimizationcompiler designtesting
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