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YunQiang Su

PROFILE

Yunqiang Su

Worked on compiler infrastructure across espressif/llvm-project and rust-lang/gcc, focusing on both feature development and codebase stability. Delivered X86 floating-point canonicalization support in LLVM, updating X86TargetLowering to improve correctness for f64 and f80 types using C++ and LLVM IR. Enhanced test suite reliability in rust-lang/gcc by adding MIPS-specific coverage for patchable function entries, validating label placement and instruction insertion in MIPS assembly. Also stabilized Windows builds in llvm-lib by reverting unintended MIPS support, maintaining project scope and CI compatibility. Demonstrated depth in compiler development, build systems, and test suite design, with careful attention to cross-platform compatibility and maintainability.

Overall Statistics

Feature vs Bugs

67%Features

Repository Contributions

3Total
Bugs
1
Commits
3
Features
2
Lines of code
395
Activity Months3

Work History

September 2025

1 Commits • 1 Features

Sep 1, 2025

Month: 2025-09. Focused on validating MIPS patchable-function-entry support in the rust-lang/gcc repository by adding dedicated test coverage. This work ensures correct placement of the .LPFE0 label and insertion of a 'nop' at the function entry when using -fpatchable-function-entry=2,1, verifying compiler handling of this optimization flag for MIPS architecture. Commit linked to the change: 0a32656dc3efd67aa1ec8b6543867fc8262c2da6.

January 2025

1 Commits • 1 Features

Jan 1, 2025

January 2025: Delivered X86 floating-point canonicalization support (FCANONICALIZE) for f64 on SSE2 and f80 on 32-bit (i686) in the LLVM X86 backend. Updated X86TargetLowering to correctly lower FCANONICALIZE operations, improving the correctness and compatibility of floating-point computations across platforms. This work reduces FP semantics gaps for FP-heavy workloads and enables more reliable optimizations in downstream toolchains.

December 2024

1 Commits

Dec 1, 2024

Month: 2024-12 — Focused on stabilizing tool behavior by reverting unintended MIPS architecture support in the llvm-lib tool within espressif/llvm-project. The rollback removes the MIPS machine type from WindowsMachineFlag.cpp and related tests, consolidating the codebase around supported architectures and reducing Windows build complexity. This work preserves project timelines and maintains compatibility with existing CI pipelines.

Activity

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Quality Metrics

Correctness93.4%
Maintainability93.4%
Architecture93.4%
Performance93.4%
AI Usage20.0%

Skills & Technologies

Programming Languages

CC++LLVM IR

Technical Skills

Build SystemsC++Compiler DevelopmentCompiler ToolingFloating-Point ArithmeticLLVMMIPS AssemblyTest Suite DevelopmentX86 Assembly

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

espressif/llvm-project

Dec 2024 Jan 2025
2 Months active

Languages Used

C++LLVM IR

Technical Skills

Build SystemsC++Compiler ToolingCompiler DevelopmentFloating-Point ArithmeticLLVM

rust-lang/gcc

Sep 2025 Sep 2025
1 Month active

Languages Used

C

Technical Skills

Compiler DevelopmentMIPS AssemblyTest Suite Development