Zhaoqi Zhao developed and optimized LoongArch vectorization and relocation features across the llvm-project, ROCm/llvm-project, and intel/llvm repositories. He engineered hardware-aware vector operations, linker relaxation, and test coverage improvements, focusing on robust code generation and performance tuning. Using C++ and LLVM IR, he implemented target-specific instruction selection, refined relocation handling, and expanded automated testing for vector paths. His work addressed backend reliability, enabled safer optimizations, and reduced regression risk by integrating pre-commit validations and custom legalization. Zhao’s contributions demonstrated deep expertise in low-level systems programming and compiler development, resulting in more maintainable and performant LoongArch support.
Monthly Summary for 2025-10 focused on ROCm/llvm-project (LoongArch). This period delivered substantial feature work and performance improvements for LoongArch vector operations, with emphasis on test coverage, lowering paths, and build/test hygiene to enable more reliable releases and faster iteration.
Monthly Summary for 2025-10 focused on ROCm/llvm-project (LoongArch). This period delivered substantial feature work and performance improvements for LoongArch vector operations, with emphasis on test coverage, lowering paths, and build/test hygiene to enable more reliable releases and faster iteration.
Month: 2025-09. Delivered and advanced multiple LoongArch-focused vectorization and optimization efforts across intel/llvm, llvm-project, and ROCm/llvm-project. Key outcomes include hardware-aware vector operation optimizations, default enabling of linker relaxation for loongarch64, broader DAG-based optimization opportunities, expanded vector instruction generation, and robustness improvements in vector build_vector and legalization workflows. These changes deliver tangible business value through improved runtime performance, faster build and optimization cycles, and easier maintainability across the LoongArch codepath.
Month: 2025-09. Delivered and advanced multiple LoongArch-focused vectorization and optimization efforts across intel/llvm, llvm-project, and ROCm/llvm-project. Key outcomes include hardware-aware vector operation optimizations, default enabling of linker relaxation for loongarch64, broader DAG-based optimization opportunities, expanded vector instruction generation, and robustness improvements in vector build_vector and legalization workflows. These changes deliver tangible business value through improved runtime performance, faster build and optimization cycles, and easier maintainability across the LoongArch codepath.
Delivered LoongArch relocation and linker relaxation improvements along with expanded test coverage for vectorization. Key changes include refined ALIGN relocation emission, fewer reserved relocations under relax, transition to symbol-based relocations for consistency, and corrected relocation recording when relax is unavailable. Added/updated tests for branch and addsub relocations under relax, and expanded LoongArch build_vector tests with repeated subsequences to boost coverage across data types. These work items increase backend reliability, reduce relocation-related failures in relax mode, and strengthen regression protection, enabling safer optimizations and future relax features. Technologies demonstrated: C++, LLVM, LoongArch specifics, symbol-based relocations, extensive testing.
Delivered LoongArch relocation and linker relaxation improvements along with expanded test coverage for vectorization. Key changes include refined ALIGN relocation emission, fewer reserved relocations under relax, transition to symbol-based relocations for consistency, and corrected relocation recording when relax is unavailable. Added/updated tests for branch and addsub relocations under relax, and expanded LoongArch build_vector tests with repeated subsequences to boost coverage across data types. These work items increase backend reliability, reduce relocation-related failures in relax mode, and strengthen regression protection, enabling safer optimizations and future relax features. Technologies demonstrated: C++, LLVM, LoongArch specifics, symbol-based relocations, extensive testing.
Month: 2025-07. Repository: llvm/clangir. Focused on optimizing the LoongArch LASX/LSX vector element insert/extract path, with codegen improvements and expanded test coverage, reinforced by pre-commit validations. Delivered end-to-end enhancements to vector element operations, improved 256-bit vector handling, and strengthened tests for reliability and maintainability. Business value includes faster vector code generation, reduced debugging time, and a more robust path for future LoongArch vector optimizations.
Month: 2025-07. Repository: llvm/clangir. Focused on optimizing the LoongArch LASX/LSX vector element insert/extract path, with codegen improvements and expanded test coverage, reinforced by pre-commit validations. Delivered end-to-end enhancements to vector element operations, improved 256-bit vector handling, and strengthened tests for reliability and maintainability. Business value includes faster vector code generation, reduced debugging time, and a more robust path for future LoongArch vector optimizations.
June 2025: llvm/clangir LoongArch vector path improvements focused on xvshuf. Delivered a feature along with safety nets and tests to reduce regression risk. Implemented LoongArch xvshuf vector shuffle support with test coverage and fixed mask handling in the lowerVECTOR_SHUFFLE_XVSHUF path. Added pre-commit tests for vector FP element insertion/extraction to ensure correct code generation and maintainability. Commits of note: - a19ddff980136835fead07b346bd83e9211124a0: [LoongArch] Pre-commit test for fixing xvshuf instructions. NFC - 30e519e1ad185701eb9593f6c727c808d7590d1b: [LoongArch] Fix xvshuf instructions lowering (#145868) - 569fcac4584ad555b9b57d09e3535260a8634429: [LoongArch] Pre-commit tests for optimizing insert extracted fp elements
June 2025: llvm/clangir LoongArch vector path improvements focused on xvshuf. Delivered a feature along with safety nets and tests to reduce regression risk. Implemented LoongArch xvshuf vector shuffle support with test coverage and fixed mask handling in the lowerVECTOR_SHUFFLE_XVSHUF path. Added pre-commit tests for vector FP element insertion/extraction to ensure correct code generation and maintainability. Commits of note: - a19ddff980136835fead07b346bd83e9211124a0: [LoongArch] Pre-commit test for fixing xvshuf instructions. NFC - 30e519e1ad185701eb9593f6c727c808d7590d1b: [LoongArch] Fix xvshuf instructions lowering (#145868) - 569fcac4584ad555b9b57d09e3535260a8634429: [LoongArch] Pre-commit tests for optimizing insert extracted fp elements
January 2025 (2025-01) achievements for espressif/llvm-project focused on expanding LoongArch support across JITLink and the linker, strengthening TLS scheduling, and integrating performance-oriented features such as prefetching. These efforts broaden architecture coverage, improve build and runtime reliability, and lay groundwork for downstream tooling (e.g., Clang Driver) and cross-architecture optimizations. Key activities include new relocation support, enhanced relaxation mechanisms, TLS scheduling fixes, prefetching integration, and test enhancements across LoongArch and RISC-V.
January 2025 (2025-01) achievements for espressif/llvm-project focused on expanding LoongArch support across JITLink and the linker, strengthening TLS scheduling, and integrating performance-oriented features such as prefetching. These efforts broaden architecture coverage, improve build and runtime reliability, and lay groundwork for downstream tooling (e.g., Clang Driver) and cross-architecture optimizations. Key activities include new relocation support, enhanced relaxation mechanisms, TLS scheduling fixes, prefetching integration, and test enhancements across LoongArch and RISC-V.
December 2024 performance summary for espressif/llvm-project. Focused on LoongArch backend improvements to boost vector path performance and robustness. Delivered two major features: 1) LoongArch vector bitreverse support with test coverage: added pre-commit tests for llvm.bitreverse intrinsics on LASX/LSX vector types; implemented optimized lowering using scalar bitrev and vshuf4i to several vector types, enabling faster execution. 2) LoongArch TLS.LE code generation optimization: refined expanding code sequence for PseudoLA_TLS_LE to improve linker relaxation and robustness for normal and medium code models. No separate bug fixes reported this month; instead, the work strengthened test coverage and code-gen stability.
December 2024 performance summary for espressif/llvm-project. Focused on LoongArch backend improvements to boost vector path performance and robustness. Delivered two major features: 1) LoongArch vector bitreverse support with test coverage: added pre-commit tests for llvm.bitreverse intrinsics on LASX/LSX vector types; implemented optimized lowering using scalar bitrev and vshuf4i to several vector types, enabling faster execution. 2) LoongArch TLS.LE code generation optimization: refined expanding code sequence for PseudoLA_TLS_LE to improve linker relaxation and robustness for normal and medium code models. No separate bug fixes reported this month; instead, the work strengthened test coverage and code-gen stability.
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