Xilinx/llvm-aie
Jan 2025 – May 2026
16 Months active
Languages Used
C++LLVM IRAssemblyMIRIRTableGenTclLLVM
Technical Skills
Compiler DevelopmentEmbedded SystemsLow-Level OptimizationLow-Level Systems ProgrammingRegister AllocationAlias Analysis
Fabian Stuckmann
PROFILE
Fabian Stuckmann
Over 16 months, contributed to the Xilinx/llvm-aie repository by developing and optimizing backend compiler features for AIE and AIE2P architectures. Focused on low-level code generation, register allocation, and instruction scheduling, the work included implementing new optimization passes, enhancing alias analysis, and improving stack-slot management. Leveraging C++ and LLVM IR, delivered robust solutions for vector processing, memory layout, and hardware-specific instruction selection. Emphasized test-driven development with expanded unit test coverage and CI integration, ensuring correctness and maintainability. Addressed complex performance and reliability challenges, resulting in more efficient codegen, reduced register pressure, and improved support for embedded and hardware-accelerated systems.
Overall Statistics
Feature vs Bugs
82%Features
Repository Contributions
171Total
Bugs
15
Commits
171
Features
68
Lines of code
54,554
Activity Months16
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2291 peopleSame Organization
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Work History
May 2026
6 Commits • 2 Features
May 1, 2026In May 2026, delivered key AIE backend optimizations for the Xilinx/llvm-aie project and expanded test coverage to improve codegen efficiency, correctness, and maintainability. Focused on folding loads into pointer-typed forms, hardening regclass constraints during IR combiner rewrites, and expanding unit tests for memory-slot materialization to ensure robust code generation.
6 Commits • 2 Features
May 1, 2026In May 2026, delivered key AIE backend optimizations for the Xilinx/llvm-aie project and expanded test coverage to improve codegen efficiency, correctness, and maintainability. Focused on folding loads into pointer-typed forms, hardening regclass constraints during IR combiner rewrites, and expanding unit tests for memory-slot materialization to ensure robust code generation.
May 2026
April 2026
26 Commits • 13 Features
Apr 1, 2026April 2026 (Xilinx/llvm-aie) delivered a focused set of performance and correctness improvements across the loop-pipelining stack, with strong emphasis on test coverage, per-loop configurability, and scheduling reliability. The month blended feature delivery with targeted bug fixes and developer UX improvements, enabling more predictable performance in performance-critical kernels and safer experimentation for kernel authors.
April 2026
26 Commits • 13 Features
Apr 1, 2026April 2026 (Xilinx/llvm-aie) delivered a focused set of performance and correctness improvements across the loop-pipelining stack, with strong emphasis on test coverage, per-loop configurability, and scheduling reliability. The month blended feature delivery with targeted bug fixes and developer UX improvements, enabling more predictable performance in performance-critical kernels and safer experimentation for kernel authors.
March 2026
24 Commits • 14 Features
Mar 1, 2026March 2026 performance highlights across the Xilinx/llvm-aie repository. Delivered architectural refactors to increase cross-architecture consistency and maintainability, advanced AIE backend features for improved vectorization and memory scheduling, expanded test coverage for critical paths, and targeted bug fixes that reduce warnings and stabilize the combiner and sign-register optimizations. Key outcomes include improved VLIW packing, more robust materialization and slot scheduling, and configurable subtarget/class options enabling targeted builds.
24 Commits • 14 Features
Mar 1, 2026March 2026 performance highlights across the Xilinx/llvm-aie repository. Delivered architectural refactors to increase cross-architecture consistency and maintainability, advanced AIE backend features for improved vectorization and memory scheduling, expanded test coverage for critical paths, and targeted bug fixes that reduce warnings and stabilize the combiner and sign-register optimizations. Key outcomes include improved VLIW packing, more robust materialization and slot scheduling, and configurable subtarget/class options enabling targeted builds.
March 2026
February 2026
16 Commits • 4 Features
Feb 1, 2026February 2026 monthly summary for Xilinx/llvm-aie focusing on delivering end-to-end AIE scheduling, selection, and memory-layout optimizations that drive performance, reduce register pressure, and enhance CI coverage. Key changes center on enabling VLDA_UPS instruction combining, improving handling of side effects and undef operands, and strengthening materialization heuristics and tests to validate ordering and correctness across the AIE backend.
February 2026
16 Commits • 4 Features
Feb 1, 2026February 2026 monthly summary for Xilinx/llvm-aie focusing on delivering end-to-end AIE scheduling, selection, and memory-layout optimizations that drive performance, reduce register pressure, and enhance CI coverage. Key changes center on enabling VLDA_UPS instruction combining, improving handling of side effects and undef operands, and strengthening materialization heuristics and tests to validate ordering and correctness across the AIE backend.
January 2026
12 Commits • 2 Features
Jan 1, 2026For 2026-01, delivered robust backend improvements for Xilinx/llvm-aie across stack-slot management, vector processing, and register allocation, with targeted bug fixes and expanded test coverage to increase reliability and business value. Highlights include: stack-slot optimization pass with frame-index elimination, spill decomposition, and stack alignment tests; cross-target alignment improvements and tests for AIE2/AIE2P; stabilized vector processing via AIECombiner improvements and shuffle-pattern shrinking tests; fixed critical register-allocation bugs (dead subregister handling in non-fine-grained RA) and WAW rewriter crash; code cleanup to streamline Conv2D checks and overall readability. Business impact: reduced memory usage, faster prologue/epilogue, more robust RA and frame-index handling, higher test coverage, and lower maintenance cost.
12 Commits • 2 Features
Jan 1, 2026For 2026-01, delivered robust backend improvements for Xilinx/llvm-aie across stack-slot management, vector processing, and register allocation, with targeted bug fixes and expanded test coverage to increase reliability and business value. Highlights include: stack-slot optimization pass with frame-index elimination, spill decomposition, and stack alignment tests; cross-target alignment improvements and tests for AIE2/AIE2P; stabilized vector processing via AIECombiner improvements and shuffle-pattern shrinking tests; fixed critical register-allocation bugs (dead subregister handling in non-fine-grained RA) and WAW rewriter crash; code cleanup to streamline Conv2D checks and overall readability. Business impact: reduced memory usage, faster prologue/epilogue, more robust RA and frame-index handling, higher test coverage, and lower maintenance cost.
January 2026
December 2025
2 Commits • 1 Features
Dec 1, 2025December 2025 focused on strengthening the LLVM-based AIE backend for Xilinx. Key accomplishments include delivering improvements to AIE register allocation and live interval management, and fixing a critical stack-slot handling issue during AIE instruction reloads. These changes enhance codegen reliability and performance on the AIE target, reduce dependence on legacy hotfixes, and stabilize the reload path. Overall, the month delivered tangible business value by improving target accuracy, reducing regressions, and enabling more predictable optimization opportunities for the AIE backend.
December 2025
2 Commits • 1 Features
Dec 1, 2025December 2025 focused on strengthening the LLVM-based AIE backend for Xilinx. Key accomplishments include delivering improvements to AIE register allocation and live interval management, and fixing a critical stack-slot handling issue during AIE instruction reloads. These changes enhance codegen reliability and performance on the AIE target, reduce dependence on legacy hotfixes, and stabilize the reload path. Overall, the month delivered tangible business value by improving target accuracy, reducing regressions, and enabling more predictable optimization opportunities for the AIE backend.
November 2025
5 Commits • 3 Features
Nov 1, 2025Month: 2025-11 — Xilinx/llvm-aie back-end improvements focused on performance, reliability, and test coverage. Delivered targeted features in the AIE backend and code generation, with enhanced validation to reduce integration risk.
5 Commits • 3 Features
Nov 1, 2025Month: 2025-11 — Xilinx/llvm-aie back-end improvements focused on performance, reliability, and test coverage. Delivered targeted features in the AIE backend and code generation, with enhanced validation to reduce integration risk.
November 2025
October 2025
15 Commits • 2 Features
Oct 1, 2025Summary for 2025-10: Focused on hardening the Xilinx/llvm-aie AIE2P backend with feature delivery, stability fixes, and infrastructure improvements. Delivered VEXT-ZEXT-BCST support for AIE2P with refactored combiner and expanded tests, stabilized VEXTBCST/AIEX store-promotion behavior, and advanced intrinsic/combiner infrastructure enabling more robust codegen and future optimizations. Expanded unit tests and improved loop-aware register rewriting, contributing to higher reliability and business value with minimal-risk changes.
October 2025
15 Commits • 2 Features
Oct 1, 2025Summary for 2025-10: Focused on hardening the Xilinx/llvm-aie AIE2P backend with feature delivery, stability fixes, and infrastructure improvements. Delivered VEXT-ZEXT-BCST support for AIE2P with refactored combiner and expanded tests, stabilized VEXTBCST/AIEX store-promotion behavior, and advanced intrinsic/combiner infrastructure enabling more robust codegen and future optimizations. Expanded unit tests and improved loop-aware register rewriting, contributing to higher reliability and business value with minimal-risk changes.
September 2025
15 Commits • 4 Features
Sep 1, 20252025-09 Summary: Delivered core AIE2P enhancements, strengthened codegen efficiency, and expanded testing/maintenance for robust optimization across architectures. This work yields higher throughput, earlier scheduling, and broader data-size support, backed by a rigorous test suite and targeted bug fixes.
15 Commits • 4 Features
Sep 1, 20252025-09 Summary: Delivered core AIE2P enhancements, strengthened codegen efficiency, and expanded testing/maintenance for robust optimization across architectures. This work yields higher throughput, earlier scheduling, and broader data-size support, backed by a rigorous test suite and targeted bug fixes.
September 2025
August 2025
7 Commits • 3 Features
Aug 1, 2025August 2025 (Xilinx/llvm-aie): Delivered stability, maintainability, and feature work across the AIEX toolchain, with a focus on reducing risk in compiler passes and expanding AIE hardware support. The work strengthened code quality, increased test coverage, and enabled safer and faster iteration for AI acceleration workflows.
August 2025
7 Commits • 3 Features
Aug 1, 2025August 2025 (Xilinx/llvm-aie): Delivered stability, maintainability, and feature work across the AIEX toolchain, with a focus on reducing risk in compiler passes and expanding AIE hardware support. The work strengthened code quality, increased test coverage, and enabled safer and faster iteration for AI acceleration workflows.
July 2025
8 Commits • 4 Features
Jul 1, 2025July 2025 monthly performance summary for Xilinx/llvm-aie. Focus areas: advancing AIE codegen reliability, performance, and test coverage. Delivered core features, fixed key issues encountered during development, and expanded verification to reduce risk in complex control-flow scenarios. Overall impact: stronger AIE backend correctness, reduced unnecessary operations, and clearer maintenance paths through refactors and improved test suites.
8 Commits • 4 Features
Jul 1, 2025July 2025 monthly performance summary for Xilinx/llvm-aie. Focus areas: advancing AIE codegen reliability, performance, and test coverage. Delivered core features, fixed key issues encountered during development, and expanded verification to reduce risk in complex control-flow scenarios. Overall impact: stronger AIE backend correctness, reduced unnecessary operations, and clearer maintenance paths through refactors and improved test suites.
July 2025
June 2025
15 Commits • 6 Features
Jun 1, 2025June 2025 — Xilinx/llvm-aie: Delivered a focused set of backend features and stability improvements for the AIE engine, prioritizing performance, reliability, and developer diagnostics. Key items include a GEP outlining pass with correct register bank handling for G_CONCAT_VECTORS on AIE2P, introduction of AIEPtrModOptimizer with refactored pre/post-increment combiners, and dynamic reordering of memory operations in the global combiner to optimize scheduling. Expanded instrumentation and diagnostics for hardware loops, bundle counts, and byte-count metrics, plus richer optimization remark dumps in MachinePipeliner. Also improved register allocation with a look-ahead for bank selection and cleanup. Fixed critical bugs (AIELegalizer crash on loop decrement; adjusted unit-test expectations for optimization remark dumping in ore-hardware-loops) to ensure stability and correctness.
June 2025
15 Commits • 6 Features
Jun 1, 2025June 2025 — Xilinx/llvm-aie: Delivered a focused set of backend features and stability improvements for the AIE engine, prioritizing performance, reliability, and developer diagnostics. Key items include a GEP outlining pass with correct register bank handling for G_CONCAT_VECTORS on AIE2P, introduction of AIEPtrModOptimizer with refactored pre/post-increment combiners, and dynamic reordering of memory operations in the global combiner to optimize scheduling. Expanded instrumentation and diagnostics for hardware loops, bundle counts, and byte-count metrics, plus richer optimization remark dumps in MachinePipeliner. Also improved register allocation with a look-ahead for bank selection and cleanup. Fixed critical bugs (AIELegalizer crash on loop decrement; adjusted unit-test expectations for optimization remark dumping in ore-hardware-loops) to ensure stability and correctness.
May 2025
7 Commits • 4 Features
May 1, 2025Monthly work summary for 2025-05 focusing on Xilinx/llvm-aie backend enhancements, with concrete feature delivery, diagnostics, and a bug fix that improves correctness and observability. The month emphasized reliability, cross-target support for AIE and AIE2P, and improved metadata handling.
7 Commits • 4 Features
May 1, 2025Monthly work summary for 2025-05 focusing on Xilinx/llvm-aie backend enhancements, with concrete feature delivery, diagnostics, and a bug fix that improves correctness and observability. The month emphasized reliability, cross-target support for AIE and AIE2P, and improved metadata handling.
May 2025
April 2025
2 Commits • 1 Features
Apr 1, 2025In April 2025, the Xilinx/llvm-aie project delivered a focused optimization in the AIE2P path that improves compiler efficiency for pointer arithmetic. The work added the ptr_add_immed_chain option to the AIE2P custom combiner, simplified the MIR test by removing redundant G_PTR_ADD, and switched to G_AIE_OFFSET_STORE with appropriate constants. A new unit test verifies the elimination of pointer-add-immediate chains in Global Instruction Selection, contributing to faster, smaller code generation for AIE-based workloads. This effort is backed by two commits that implement the changes and tests.
April 2025
2 Commits • 1 Features
Apr 1, 2025In April 2025, the Xilinx/llvm-aie project delivered a focused optimization in the AIE2P path that improves compiler efficiency for pointer arithmetic. The work added the ptr_add_immed_chain option to the AIE2P custom combiner, simplified the MIR test by removing redundant G_PTR_ADD, and switched to G_AIE_OFFSET_STORE with appropriate constants. A new unit test verifies the elimination of pointer-add-immediate chains in Global Instruction Selection, contributing to faster, smaller code generation for AIE-based workloads. This effort is backed by two commits that implement the changes and tests.
February 2025
9 Commits • 3 Features
Feb 1, 2025February 2025: Delivered critical backend enhancements for the AIE2P backend in Xilinx/llvm-aie, focusing on correctness, performance potential, and test stability. Implemented enhanced AIE2P alias analysis, a robust multi-slot instruction materialization framework with pseudo materialization and default-enabled behavior, and AIEX multi-slot assignment improvements with unit tests and optimization options. Fixed a FIFO spill ordering bug for AIE2P to ensure correct data handling and test consistency. Collectively these workstreams increase compile-time optimization opportunities for AIE2P workloads while reducing risk of incorrect code generation and data misordering. Demonstrated strong C++ LLVM backend skills, test-driven development, and cross-component collaboration.
9 Commits • 3 Features
Feb 1, 2025February 2025: Delivered critical backend enhancements for the AIE2P backend in Xilinx/llvm-aie, focusing on correctness, performance potential, and test stability. Implemented enhanced AIE2P alias analysis, a robust multi-slot instruction materialization framework with pseudo materialization and default-enabled behavior, and AIEX multi-slot assignment improvements with unit tests and optimization options. Fixed a FIFO spill ordering bug for AIE2P to ensure correct data handling and test consistency. Collectively these workstreams increase compile-time optimization opportunities for AIE2P workloads while reducing risk of incorrect code generation and data misordering. Demonstrated strong C++ LLVM backend skills, test-driven development, and cross-component collaboration.
February 2025
January 2025
2 Commits • 2 Features
Jan 1, 2025Month: 2025-01 | Repository: Xilinx/llvm-aie. This monthly summary highlights key features delivered, any major bugs fixed, overall impact, and technologies demonstrated. Business value is centered on improvements to AIE2P backend efficiency and licensing maintenance.
January 2025
2 Commits • 2 Features
Jan 1, 2025Month: 2025-01 | Repository: Xilinx/llvm-aie. This monthly summary highlights key features delivered, any major bugs fixed, overall impact, and technologies demonstrated. Business value is centered on improvements to AIE2P backend efficiency and licensing maintenance.
Activity
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Quality Metrics
Correctness92.0%
Maintainability87.6%
Architecture90.0%
Performance85.8%
AI Usage32.0%
Skills & Technologies
Programming Languages
AssemblyCC++IRLLVMLLVM IRMIRMarkdownMirTableGen
Technical Skills
Algorithm DesignAlgorithm OptimizationAlias AnalysisAssembly GenerationAssembly LanguageBackend DevelopmentBash scriptingC programmingC++C++ developmentC++ programmingCI/CDCode GenerationCode OptimizationCode Refactoring
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