xdslproject/xdsl
Nov 2024 – Apr 2026
11 Months active
Languages Used
MLIRPythonCMakefile
Technical Skills
Compiler DevelopmentDSL ImplementationInterpreter DesignMLIRPattern MatchingTesting
Hugo Pompougnac
PROFILE
Hugo Pompougnac
Over eleven months, contributed to the xdslproject/xdsl repository by building and optimizing the x86 backend, focusing on memory, vector, and arithmetic operation lowering, AVX-512 register allocation, and robust function prologue/epilogue generation. Leveraged Python, MLIR, and x86 Assembly to implement features such as AVX/SSE vector support, matrix multiplication integration tests, and advanced register management strategies. Delivered targeted bug fixes and verification passes to improve code generation correctness and backend safety. The work emphasized test-driven development, integration testing, and performance tuning, resulting in a more reliable, maintainable, and efficient compiler backend for x86 workloads and advanced vectorization scenarios.
Overall Statistics
Feature vs Bugs
72%Features
Repository Contributions
44Total
Bugs
5
Commits
44
Features
13
Lines of code
3,998
Activity Months11
Your Network
127 peopleWork History
April 2026
1 Commits • 1 Features
Apr 1, 2026In April 2026, delivered a focused performance optimization for the x86 backend in the xdsl repository. By removing unnecessary checks for cardinality preservation in the x86 legalization pass, the operation was streamlined and performance improved. Implemented as a single commit: 3976b3ebe9cc4c3fe430d01ae2b5389fc80827c8 with message 'x86 legalize: cardinality preservation is in fact not a requirement (#5494)'. This work reduces overhead in the legalization path and contributes to faster code generation for x86 targets, enhancing overall compiler performance and maintainability.
1 Commits • 1 Features
Apr 1, 2026In April 2026, delivered a focused performance optimization for the x86 backend in the xdsl repository. By removing unnecessary checks for cardinality preservation in the x86 legalization pass, the operation was streamlined and performance improved. Implemented as a single commit: 3976b3ebe9cc4c3fe430d01ae2b5389fc80827c8 with message 'x86 legalize: cardinality preservation is in fact not a requirement (#5494)'. This work reduces overhead in the legalization path and contributes to faster code generation for x86 targets, enhancing overall compiler performance and maintainability.
April 2026
December 2025
1 Commits • 1 Features
Dec 1, 2025December 2025 focused on delivering a high-impact compiler optimization for x86 code within the xdsl project. A new X86 Register Allocation Optimization Pass was introduced to remove unnecessary move operations when they are the last use of a register, reducing redundant instructions and improving generated code efficiency. This work was implemented as a dedicated transformation pass and linked to a commit in the repository to enable traceability and review.
December 2025
1 Commits • 1 Features
Dec 1, 2025December 2025 focused on delivering a high-impact compiler optimization for x86 code within the xdsl project. A new X86 Register Allocation Optimization Pass was introduced to remove unnecessary move operations when they are the last use of a register, reducing redundant instructions and improving generated code efficiency. This work was implemented as a dedicated transformation pass and linked to a commit in the repository to enable traceability and review.
November 2025
2 Commits • 1 Features
Nov 1, 2025Month: 2025-11 — Focused on strengthening correctness and backend safety in the xdsl project. Key outcomes include a bug fix to X86 loop lowering that replaced jl with jge to ensure correct branching in generated code, improving correctness and performance of loop constructs. Also introduced a verification pass for inout register management to guard against reading registers after their last use, reducing risk of misuse and miscompilation. Impact: more reliable code generation, reduced debugging time, and clearer safety guarantees for register handling. This work demonstrates proficiency in low-level code generation, backend register management, and verification tooling, and lays groundwork for further optimizations and safer abstractions. Commits captured: 93442578dcda212d9e781dfffe77d625de6f3a26; fa90a8d0c62368b93afd1a98f8c5a822de3611ec.
2 Commits • 1 Features
Nov 1, 2025Month: 2025-11 — Focused on strengthening correctness and backend safety in the xdsl project. Key outcomes include a bug fix to X86 loop lowering that replaced jl with jge to ensure correct branching in generated code, improving correctness and performance of loop constructs. Also introduced a verification pass for inout register management to guard against reading registers after their last use, reducing risk of misuse and miscompilation. Impact: more reliable code generation, reduced debugging time, and clearer safety guarantees for register handling. This work demonstrates proficiency in low-level code generation, backend register management, and verification tooling, and lays groundwork for further optimizations and safer abstractions. Commits captured: 93442578dcda212d9e781dfffe77d625de6f3a26; fa90a8d0c62368b93afd1a98f8c5a822de3611ec.
November 2025
October 2025
1 Commits • 1 Features
Oct 1, 2025October 2025: Delivered a foundational improvement to the x86 backend focusing on correct function prologue/epilogue generation and callee-saved register handling. Implemented a dedicated pass that pushes callee-saved registers at function entry and pops them on return to preserve program state across calls. This work strengthens ABI conformance and codegen reliability, and sets the stage for future optimizations in the xdsl backend. Major bugs fixed: none reported this month. Impact and accomplishments: improves runtime stability of generated code, reduces risk of register corruption across module boundaries, and enhances cross-module interoperability. Provides a more maintainable approach to saving/restoring callee-saved state, enabling smoother future enhancements. Technologies/skills demonstrated: x86 code generation, compiler backend passes, register management strategies, low-level systems programming, patch integration and review.
October 2025
1 Commits • 1 Features
Oct 1, 2025October 2025: Delivered a foundational improvement to the x86 backend focusing on correct function prologue/epilogue generation and callee-saved register handling. Implemented a dedicated pass that pushes callee-saved registers at function entry and pops them on return to preserve program state across calls. This work strengthens ABI conformance and codegen reliability, and sets the stage for future optimizations in the xdsl backend. Major bugs fixed: none reported this month. Impact and accomplishments: improves runtime stability of generated code, reduces risk of register corruption across module boundaries, and enhances cross-module interoperability. Provides a more maintainable approach to saving/restoring callee-saved state, enabling smoother future enhancements. Technologies/skills demonstrated: x86 code generation, compiler backend passes, register management strategies, low-level systems programming, patch integration and review.
September 2025
1 Commits • 1 Features
Sep 1, 2025In September 2025, the xdsl project delivered AVX-512 Register Allocation Support in the x86 backend, enabling AVX-512 aware register allocation and end-to-end support across codegen path and tests. This lays the groundwork for higher-performance code paths on AVX-512 capable CPUs and better resource utilization in SIMD workloads.
1 Commits • 1 Features
Sep 1, 2025In September 2025, the xdsl project delivered AVX-512 Register Allocation Support in the x86 backend, enabling AVX-512 aware register allocation and end-to-end support across codegen path and tests. This lays the groundwork for higher-performance code paths on AVX-512 capable CPUs and better resource utilization in SIMD workloads.
September 2025
August 2025
2 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary for xdsl project focusing on delivery and verification of MLIR-based x86 matrix multiplication capabilities and the accompanying integration testing harness. The work enhances test coverage, ensures correctness of MLIR-generated assembly against a straightforward C reference, and improves maintainability with a dedicated harness and clear documentation.
August 2025
2 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary for xdsl project focusing on delivery and verification of MLIR-based x86 matrix multiplication capabilities and the accompanying integration testing harness. The work enhances test coverage, ensures correctness of MLIR-generated assembly against a straightforward C reference, and improves maintainability with a dedicated harness and clear documentation.
July 2025
3 Commits • 1 Features
Jul 1, 2025Month 2025-07: Focused on strengthening the x86 backend with correctness improvements, enhanced register management, and broader type handling. Core work targeted lowering accuracy for no-argument functions, improved register allocation, and smoother type casting during lowering, all underpinned by tests and MLIR test/helping updates.
3 Commits • 1 Features
Jul 1, 2025Month 2025-07: Focused on strengthening the x86 backend with correctness improvements, enhanced register management, and broader type handling. Core work targeted lowering accuracy for no-argument functions, improved register allocation, and smoother type casting during lowering, all underpinned by tests and MLIR test/helping updates.
July 2025
June 2025
7 Commits • 1 Features
Jun 1, 2025June 2025: Expanded xdsl x86 backend lowering to cover memory, vector, and arithmetic ops, including double-precision pointer loads and new instruction mappings. Implemented DM_VmovupdOp, added test coverage, and aligned constants and arithmetics (addi, muli) to x86, enabling broader codegen and preparing for performance improvements in memory-heavy workloads. All changes delivered through 7 commits with traceable messages.
June 2025
7 Commits • 1 Features
Jun 1, 2025June 2025: Expanded xdsl x86 backend lowering to cover memory, vector, and arithmetic ops, including double-precision pointer loads and new instruction mappings. Implemented DM_VmovupdOp, added test coverage, and aligned constants and arithmetics (addi, muli) to x86, enabling broader codegen and preparing for performance improvements in memory-heavy workloads. All changes delivered through 7 commits with traceable messages.
May 2025
10 Commits • 2 Features
May 1, 2025Month: 2025-05 summary focused on strengthening the xdsl X86 backend with two major feature areas: memory/vector lowering and vector broadcast. Delivered AVX-512-capable lowering paths for pointer loads/stores, pointer arithmetic, and vector operations, with fixes for type casting after lowering; added vector broadcast support with proper DS_Operation handling and lowering for vpbroadcast. Also fixed critical correctness issues in the lowering path (cast after pointer ops) and harmonized DS_Operation register types to prevent mismatches. Business value: improved performance and reliability for vectorized code on x86, enabling more workloads to compile and run efficiently on AVX-512-capable machines. Technologies/skills demonstrated: xdsl backend development, AVX-512 vectorization, pointer-lowering transformations, vector broadcast and FMA lowering, DS_Operation typing, and IR-to-assembly lowering.
10 Commits • 2 Features
May 1, 2025Month: 2025-05 summary focused on strengthening the xdsl X86 backend with two major feature areas: memory/vector lowering and vector broadcast. Delivered AVX-512-capable lowering paths for pointer loads/stores, pointer arithmetic, and vector operations, with fixes for type casting after lowering; added vector broadcast support with proper DS_Operation handling and lowering for vpbroadcast. Also fixed critical correctness issues in the lowering path (cast after pointer ops) and harmonized DS_Operation register types to prevent mismatches. Business value: improved performance and reliability for vectorized code on x86, enabling more workloads to compile and run efficiently on AVX-512-capable machines. Technologies/skills demonstrated: xdsl backend development, AVX-512 vectorization, pointer-lowering transformations, vector broadcast and FMA lowering, DS_Operation typing, and IR-to-assembly lowering.
May 2025
February 2025
12 Commits • 2 Features
Feb 1, 2025February 2025 monthly summary for xdsl project (xdsl). The month focused on strengthening the x86 backend with broader vectorization support, robust function lowering, and improved assembly emission, alongside fixes to the libxsmm matmul integration. These changes increase reliability, correctness, and performance potential for x86 codegen, and expand testing coverage to safeguard future optimizations.
February 2025
12 Commits • 2 Features
Feb 1, 2025February 2025 monthly summary for xdsl project (xdsl). The month focused on strengthening the x86 backend with broader vectorization support, robust function lowering, and improved assembly emission, alongside fixes to the libxsmm matmul integration. These changes increase reliability, correctness, and performance potential for x86 codegen, and expand testing coverage to safeguard future optimizations.
November 2024
4 Commits • 1 Features
Nov 1, 2024Month: 2024-11 — Focused on delivering business-value through PDL integration, robust type handling, and stabilizing the MLIR conversion test suite. Implemented PDL pattern language integration with a new apply-pdl pass that can apply patterns from external files or inline modules, and enhanced the PDL interpreter for robust polymorphic and fixed-type matching, supported by new tests. Strengthened MLIR-related testing by fixing attribute positioning for linalg.fill in MLIR conversion tests and adding a zero constant to support the test update. These changes improve pattern-driven optimization capabilities, accuracy of type interpretation, and test reliability, contributing to more reliable optimization workflows and faster release cycles. Demonstrated proficiency with MLIR/xdsl dialects, PDL tooling, test-driven development, and cross-dialect testing, delivering concrete features and stability improvements.
4 Commits • 1 Features
Nov 1, 2024Month: 2024-11 — Focused on delivering business-value through PDL integration, robust type handling, and stabilizing the MLIR conversion test suite. Implemented PDL pattern language integration with a new apply-pdl pass that can apply patterns from external files or inline modules, and enhanced the PDL interpreter for robust polymorphic and fixed-type matching, supported by new tests. Strengthened MLIR-related testing by fixing attribute positioning for linalg.fill in MLIR conversion tests and adding a zero constant to support the test update. These changes improve pattern-driven optimization capabilities, accuracy of type interpretation, and test reliability, contributing to more reliable optimization workflows and faster release cycles. Demonstrated proficiency with MLIR/xdsl dialects, PDL tooling, test-driven development, and cross-dialect testing, delivering concrete features and stability improvements.
November 2024
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Quality Metrics
Correctness93.6%
Maintainability88.2%
Architecture89.6%
Performance84.4%
AI Usage21.8%
Skills & Technologies
Programming Languages
CMLIRMakefilePython
Technical Skills
AVX InstructionsAssembly GenerationAssembly LanguageBackend DevelopmentCompiler DesignCompiler DevelopmentCompiler Pass ImplementationDSL ImplementationFloating-Point ArithmeticIR DesignIntegration TestingInterpreter DesignLow-Level OptimizationLow-Level Systems ProgrammingLow-level Optimization
Repositories Contributed To
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