mozilla/gecko-dev
Jun 2025 – Jun 2025
1 Month active
Languages Used
C++
Technical Skills
Assembly languageAssembly language simulationCompiler developmentDebuggingLow-level programmingMemory management
Xuan Chen
PROFILE
Xuan Chen
Worked on the mozilla/gecko-dev repository to enhance the reliability of MIPS64 simulation and WebAssembly error handling. Addressed two complex bugs by refining the floating-point conditional move emulation, ensuring accurate extraction of the fcc field and correct detection of instruction variants. Improved the reporting of unaligned memory access segfaults in MIPS64/WebAssembly, enabling precise identification of faulting addresses for better diagnostics. Utilized C++ and low-level programming skills, with a focus on assembly language simulation and memory management. These targeted fixes reduced debugging time and increased the accuracy of emulation, contributing to more robust MIPS64 support within the codebase.
Overall Statistics
Feature vs Bugs
0%Features
Repository Contributions
2Total
Bugs
2
Commits
2
Features
0
Lines of code
179
Activity Months1
Your Network
503 peopleSame Organization
@oss.cipunited.com3
Shared Repositories
500
Work History
June 2025
2 Commits
Jun 1, 2025June 2025 — Key fixes in mozilla/gecko-dev: (1) MIPS64 Simulator: Correct floating-point conditional move (movf.movt) behavior by fixing extraction of the fcc field and bit 16 to distinguish movf.fmt and movt.fmt; commit afe484b5076f29c21f0c167ad6d8937391f0490e (Bug 1971730). (2) MIPS64/WebAssembly: Report unaligned memory access segfaults at the precise address; fix wasm segfault handling for unaligned access to report the exact address; commit e953250a57ce7320c9939dce87a18c72e24ee6df (Bug 1973446). These changes improve accuracy of FP emulation and error diagnostics, reducing debugging time and increasing reliability for MIPS64 paths in Wasm.
2 Commits
Jun 1, 2025June 2025 — Key fixes in mozilla/gecko-dev: (1) MIPS64 Simulator: Correct floating-point conditional move (movf.movt) behavior by fixing extraction of the fcc field and bit 16 to distinguish movf.fmt and movt.fmt; commit afe484b5076f29c21f0c167ad6d8937391f0490e (Bug 1971730). (2) MIPS64/WebAssembly: Report unaligned memory access segfaults at the precise address; fix wasm segfault handling for unaligned access to report the exact address; commit e953250a57ce7320c9939dce87a18c72e24ee6df (Bug 1973446). These changes improve accuracy of FP emulation and error diagnostics, reducing debugging time and increasing reliability for MIPS64 paths in Wasm.
June 2025
Activity
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Quality Metrics
Correctness100.0%
Maintainability80.0%
Architecture80.0%
Performance90.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++
Technical Skills
Assembly languageAssembly language simulationCompiler developmentDebuggingLow-level programmingMemory managementWebAssembly
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