Xilinx/llvm-aie
Jan 2025 – May 2026
14 Months active
Languages Used
CC++IRLLVM IRTableGenTclMIRMachine IR
Technical Skills
Assembly LanguageCode RefactoringCompiler DevelopmentCompiler developmentDisassembler DevelopmentEmbedded Systems
Hamza Khallouki
PROFILE
Hamza Khallouki
Worked extensively on the Xilinx/llvm-aie repository, delivering features and fixes for the AIE backend over 14 months. Focused on low-level compiler development, this work included implementing advanced vectorization, register allocation, and hardware-specific optimizations using C++ and LLVM. Enhanced code generation reliability, expanded support for new data types and address spaces, and improved scheduling for high-performance computing workloads. Refactored core components for maintainability, streamlined intrinsic handling, and strengthened test coverage to reduce regression risk. Addressed complex issues in instruction selection, spill handling, and zero-overhead loop alignment, demonstrating depth in embedded systems, low-level programming, and performance optimization throughout the project.
Overall Statistics
Feature vs Bugs
75%Features
Repository Contributions
90Total
Bugs
12
Commits
90
Features
36
Lines of code
148,201
Activity Months14
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2295 peopleSame Organization
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Work History
May 2026
4 Commits • 1 Features
May 1, 2026May 2026 monthly summary for Xilinx/llvm-aie focusing on feature delivery, bug fixes, impact, and skills demonstrated. Highlights include the introduction of AIE2PS code generation reliability tests for register coalescing and scheduling, and targeted correctness fixes to the register coalescing logic and FIFO dependency modeling. This month also strengthened test coverage to enable safer refactors and reduce regression risk.
4 Commits • 1 Features
May 1, 2026May 2026 monthly summary for Xilinx/llvm-aie focusing on feature delivery, bug fixes, impact, and skills demonstrated. Highlights include the introduction of AIE2PS code generation reliability tests for register coalescing and scheduling, and targeted correctness fixes to the register coalescing logic and FIFO dependency modeling. This month also strengthened test coverage to enable safer refactors and reduce regression risk.
May 2026
March 2026
6 Commits • 1 Features
Mar 1, 2026Month: 2026-03 — Delivered robust AIE Zero-Overhead Loop (ZOL) enhancements in Xilinx/llvm-aie, including setup distance control, jump padding, and distance verification, with alignment boundary refinements and performance improvements. Refactoring for readability laid groundwork for easier future maintenance.
March 2026
6 Commits • 1 Features
Mar 1, 2026Month: 2026-03 — Delivered robust AIE Zero-Overhead Loop (ZOL) enhancements in Xilinx/llvm-aie, including setup distance control, jump padding, and distance verification, with alignment boundary refinements and performance improvements. Refactoring for readability laid groundwork for easier future maintenance.
February 2026
3 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for Xilinx/llvm-aie focusing on delivering improvements to AIE instruction handling and broadcasting. Implemented enhancements to the AIE CombinerHelper to support non-vector inputs in vector broadcasting, clarified AIE2 instruction naming, and removed an architecture-specific check in the VLD.CONV combine logic to broaden applicability across architectures. Updated tests accordingly to reflect these changes and ensure robust coverage.
3 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for Xilinx/llvm-aie focusing on delivering improvements to AIE instruction handling and broadcasting. Implemented enhancements to the AIE CombinerHelper to support non-vector inputs in vector broadcasting, clarified AIE2 instruction naming, and removed an architecture-specific check in the VLD.CONV combine logic to broaden applicability across architectures. Updated tests accordingly to reflect these changes and ensure robust coverage.
February 2026
January 2026
1 Commits • 1 Features
Jan 1, 20262026-01 Monthly Summary: Focused delivery and verification improvements for the Xilinx/llvm-aie backend (AIE2P). Extended address space support for pointer types and reinforced verification coverage to ensure safe cross-space pointer operations.
January 2026
1 Commits • 1 Features
Jan 1, 20262026-01 Monthly Summary: Focused delivery and verification improvements for the Xilinx/llvm-aie backend (AIE2P). Extended address space support for pointer types and reinforced verification coverage to ensure safe cross-space pointer operations.
December 2025
1 Commits • 1 Features
Dec 1, 2025December 2025: Focused on improving portability and maintainability of the AIE LLVM backend by refactoring the LoadStoreVectorizer hook architecture to enable inheritance across all AIE targets. This change improves code reuse, consistency, and future-proofing for AIE target support. No functional changes were introduced as part of this NFC refactor; groundwork laid for streamlined extension to additional targets.
1 Commits • 1 Features
Dec 1, 2025December 2025: Focused on improving portability and maintainability of the AIE LLVM backend by refactoring the LoadStoreVectorizer hook architecture to enable inheritance across all AIE targets. This change improves code reuse, consistency, and future-proofing for AIE target support. No functional changes were introduced as part of this NFC refactor; groundwork laid for streamlined extension to additional targets.
December 2025
November 2025
2 Commits • 1 Features
Nov 1, 2025November 2025 monthly summary: Delivered targeted vectorization backend enhancements for Xilinx/llvm-aie, focusing on padding and unpadding for 128-bit and 256-bit vectors. Consolidated refactors to vector instruction selection logic, resulting in more reliable and maintainable vector handling. Introduced new subregister indexing methods and removed outdated code to streamline maintenance and future expansion. Implemented edge-case fixes in padding/unpadding selection to reduce misselection risks and production defects.
November 2025
2 Commits • 1 Features
Nov 1, 2025November 2025 monthly summary: Delivered targeted vectorization backend enhancements for Xilinx/llvm-aie, focusing on padding and unpadding for 128-bit and 256-bit vectors. Consolidated refactors to vector instruction selection logic, resulting in more reliable and maintainable vector handling. Introduced new subregister indexing methods and removed outdated code to streamline maintenance and future expansion. Implemented edge-case fixes in padding/unpadding selection to reduce misselection risks and production defects.
October 2025
2 Commits • 1 Features
Oct 1, 2025Monthly summary for 2025-10 focused on delivering a refactor and API improvements in the Xilinx/llvm-aie backend to strengthen register spill handling. No major bugs fixed this period; primary work centered on improving code reuse, API consistency, and long-term maintainability, setting the stage for upcoming performance optimizations. Key outcomes: - Refactor: AIE Register Spill Handling Improvement and Encodable Check Refactor in Xilinx/llvm-aie. Moved isEncodableAsNegativeInt from AIE2PRegisterInfo.cpp to AIEBaseRegisterInfo.h for better reuse; enhanced spill state management by integrating TargetRegisterInfo into various APIs. - Commits contributing to this work: - 7a29c9cb383e5cc8bf6ee6a1d1c4df85e079418e: [AIEX] Move isEncodableAsNegativeInt to AIEBaseRegisterInfo - 65344506164b114ba275c05ba5d05725df25c475: [AIEX][NFC] Add TargetRegisterInfo to various spills APIs Business impact: - Improves maintainability and reuse by centralizing encoding logic and standardizing spill API usage, reducing future downstream work and risk of regressions. - Establishes groundwork for cross-target spill optimizations and easier future enhancements. Technologies/skills demonstrated: - C++, LLVM backend conventions, TargetRegisterInfo API usage, and refactoring practices (code reuse, API stabilization). NFC changes kept behavior intact while improving interfaces.
2 Commits • 1 Features
Oct 1, 2025Monthly summary for 2025-10 focused on delivering a refactor and API improvements in the Xilinx/llvm-aie backend to strengthen register spill handling. No major bugs fixed this period; primary work centered on improving code reuse, API consistency, and long-term maintainability, setting the stage for upcoming performance optimizations. Key outcomes: - Refactor: AIE Register Spill Handling Improvement and Encodable Check Refactor in Xilinx/llvm-aie. Moved isEncodableAsNegativeInt from AIE2PRegisterInfo.cpp to AIEBaseRegisterInfo.h for better reuse; enhanced spill state management by integrating TargetRegisterInfo into various APIs. - Commits contributing to this work: - 7a29c9cb383e5cc8bf6ee6a1d1c4df85e079418e: [AIEX] Move isEncodableAsNegativeInt to AIEBaseRegisterInfo - 65344506164b114ba275c05ba5d05725df25c475: [AIEX][NFC] Add TargetRegisterInfo to various spills APIs Business impact: - Improves maintainability and reuse by centralizing encoding logic and standardizing spill API usage, reducing future downstream work and risk of regressions. - Establishes groundwork for cross-target spill optimizations and easier future enhancements. Technologies/skills demonstrated: - C++, LLVM backend conventions, TargetRegisterInfo API usage, and refactoring practices (code reuse, API stabilization). NFC changes kept behavior intact while improving interfaces.
October 2025
August 2025
1 Commits • 1 Features
Aug 1, 2025Month: 2025-08 — Key feature delivered in Xilinx/llvm-aie with substantial impact on code quality and build efficiency. Implemented Intrinsic Header Deduplication in AIEX, removing leftover duplicate intrinsic headers to streamline the codebase, reduce potential conflicts, and shorten build times. This work reinforces code health, simplifies future maintenance, and prepares the project for smoother future integrations.
August 2025
1 Commits • 1 Features
Aug 1, 2025Month: 2025-08 — Key feature delivered in Xilinx/llvm-aie with substantial impact on code quality and build efficiency. Implemented Intrinsic Header Deduplication in AIEX, removing leftover duplicate intrinsic headers to streamline the codebase, reduce potential conflicts, and shorten build times. This work reinforces code health, simplifies future maintenance, and prepares the project for smoother future integrations.
July 2025
4 Commits • 1 Features
Jul 1, 2025July 2025 monthly wrap-up for Xilinx/llvm-aie: Delivered key correctness fixes for AIE2P scheduling, expanded intrinsic correctness and test coverage, and tightened test infrastructure to validate binary encoding and AIE2/AIE2P behavior. These work items improve reliability, maintainability, and business value for the AIE back-end.
4 Commits • 1 Features
Jul 1, 2025July 2025 monthly wrap-up for Xilinx/llvm-aie: Delivered key correctness fixes for AIE2P scheduling, expanded intrinsic correctness and test coverage, and tightened test infrastructure to validate binary encoding and AIE2/AIE2P behavior. These work items improve reliability, maintainability, and business value for the AIE back-end.
July 2025
May 2025
6 Commits • 2 Features
May 1, 2025May 2025 was focused on stabilizing and expanding AIE2P vector capabilities in Xilinx/llvm-aie. Delivered a critical bug fix to vector unpack/legalization, enhanced vector operation handling for 32-bit and 64-bit vectors, and introduced BFP16 support with new intrinsics and wide load/store capabilities. These changes improve robustness, broaden data-type support for ML workloads, and enable more flexible vector programming, contributing to faster feature delivery and better performance for ML workloads.
May 2025
6 Commits • 2 Features
May 1, 2025May 2025 was focused on stabilizing and expanding AIE2P vector capabilities in Xilinx/llvm-aie. Delivered a critical bug fix to vector unpack/legalization, enhanced vector operation handling for 32-bit and 64-bit vectors, and introduced BFP16 support with new intrinsics and wide load/store capabilities. These changes improve robustness, broaden data-type support for ML workloads, and enable more flexible vector programming, contributing to faster feature delivery and better performance for ML workloads.
April 2025
1 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for Xilinx/llvm-aie: Focused on delivering a feature enhancement to the AIE post-register allocation pipeliner. Increased the maximum II (initiation interval) attempt limit from 10 to 20, enabling more scheduling attempts and potential performance improvements for complex workloads on AIE targets. This work directly supports performance goals by expanding the scheduling search space and reducing stalls in challenging scenarios. No bug fixes were completed this month. Commit reference for the change is included below for traceability.
1 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for Xilinx/llvm-aie: Focused on delivering a feature enhancement to the AIE post-register allocation pipeliner. Increased the maximum II (initiation interval) attempt limit from 10 to 20, enabling more scheduling attempts and potential performance improvements for complex workloads on AIE targets. This work directly supports performance goals by expanding the scheduling search space and reducing stalls in challenging scenarios. No bug fixes were completed this month. Commit reference for the change is included below for traceability.
April 2025
March 2025
24 Commits • 12 Features
Mar 1, 20252025-03 monthly summary for Xilinx/llvm-aie: Stabilized the AIE2P backend, expanded shuffle/vector capabilities, and strengthened test coverage to improve reliability and codegen quality. Key work includes simulator silence fixes, Prelegalizer stability improvements, stricter legality handling, and expanded end-to-end tests for vector shuffles and insertions, plus enhanced support for G_AIE_INSERT_VECTOR_ELT with better RegBankSelect and instruction selection.
March 2025
24 Commits • 12 Features
Mar 1, 20252025-03 monthly summary for Xilinx/llvm-aie: Stabilized the AIE2P backend, expanded shuffle/vector capabilities, and strengthened test coverage to improve reliability and codegen quality. Key work includes simulator silence fixes, Prelegalizer stability improvements, stricter legality handling, and expanded end-to-end tests for vector shuffles and insertions, plus enhanced support for G_AIE_INSERT_VECTOR_ELT with better RegBankSelect and instruction selection.
February 2025
10 Commits • 2 Features
Feb 1, 2025February 2025 (2025-02) monthly summary for Xilinx/llvm-aie: Key features delivered include FIFO loads with extra storage support in AIE2P (IR lowering and instruction set coverage) with related intrinsics and test coverage; BF16 vector multiply support (G_FMUL) on AIE2P (instruction select and legalizer); plus backend improvements for AIE2/AIE2P to strengthen register handling and verifier compliance. Major bugs fixed include backend register handling and verifier fixes to satisfy MachineVerifier, along with targeted test cleanup. Overall impact: expanded data movement capabilities and BF16 vector compute while strengthening backend robustness and test reliability, enabling more complex workloads and reducing regression risk. Technologies demonstrated: AIE2P backend stack (IR lowering, Instruction Select, legalizer), RegBankSelect, MachineVerifier compliance, and test/intrinsics infrastructure.
10 Commits • 2 Features
Feb 1, 2025February 2025 (2025-02) monthly summary for Xilinx/llvm-aie: Key features delivered include FIFO loads with extra storage support in AIE2P (IR lowering and instruction set coverage) with related intrinsics and test coverage; BF16 vector multiply support (G_FMUL) on AIE2P (instruction select and legalizer); plus backend improvements for AIE2/AIE2P to strengthen register handling and verifier compliance. Major bugs fixed include backend register handling and verifier fixes to satisfy MachineVerifier, along with targeted test cleanup. Overall impact: expanded data movement capabilities and BF16 vector compute while strengthening backend robustness and test reliability, enabling more complex workloads and reducing regression risk. Technologies demonstrated: AIE2P backend stack (IR lowering, Instruction Select, legalizer), RegBankSelect, MachineVerifier compliance, and test/intrinsics infrastructure.
February 2025
January 2025
25 Commits • 10 Features
Jan 1, 2025January 2025 performance highlights for Xilinx/llvm-aie. Delivered foundational AIE addressing capabilities, fortified ABI compliance, and expanded FIFO-based register-bank workflows. Implemented robust 2D/3D addressing intrinsics, refined RegBank selection for G_STORE and EX registers, and advanced FIFO architecture with improved spill handling, CopyPhysReg, and IR lowering. Strengthened code generation reliability through alignment fixes and targeted tests across vector and FIFO paths, driving stability and performance for complex AIE workloads.
January 2025
25 Commits • 10 Features
Jan 1, 2025January 2025 performance highlights for Xilinx/llvm-aie. Delivered foundational AIE addressing capabilities, fortified ABI compliance, and expanded FIFO-based register-bank workflows. Implemented robust 2D/3D addressing intrinsics, refined RegBank selection for G_STORE and EX registers, and advanced FIFO architecture with improved spill handling, CopyPhysReg, and IR lowering. Strengthened code generation reliability through alignment fixes and targeted tests across vector and FIFO paths, driving stability and performance for complex AIE workloads.
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Quality Metrics
Correctness92.8%
Maintainability90.8%
Architecture90.6%
Performance87.6%
AI Usage23.6%
Skills & Technologies
Programming Languages
CC++IRLLVM IRMIRMachine IRMirTableGenTcl
Technical Skills
AIE ArchitectureAssemblyAssembly LanguageC++ developmentCode CleanupCode GenerationCode RefactoringCompiler DevelopmentCompiler OptimizationCompiler TestingCompiler developmentDebuggingDisassembler DevelopmentEmbedded SystemsEmbedded systems
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