google/xls
Nov 2024 – Apr 2026
11 Months active
Languages Used
C++Python
Technical Skills
Code GenerationCode OptimizationCode RefactoringCode VerificationCompiler DevelopmentCompiler Optimization
Simone Campanoni
PROFILE
Simone Campanoni
Over an 11-month period, contributed advanced optimization and analysis features to the google/xls compiler, focusing on resource sharing, IR transformation, and performance improvements. Developed and extended passes for folding, select merging, and narrowing, leveraging C++ and Python to implement algorithms for bit manipulation, graph analysis, and static analysis. Enhanced API design for better integration and maintainability, modernized test suites, and improved code safety through explicit constructors and header management. The work emphasized modularity and extensibility, enabling more efficient code generation and faster builds while reducing maintenance overhead and supporting robust, parameter-driven optimization in resource-constrained environments.
Overall Statistics
Feature vs Bugs
94%Features
Repository Contributions
37Total
Bugs
1
Commits
37
Features
17
Lines of code
10,581
Activity Months11
Your Network
4777 peopleSame Organization
@google.com4703
Benedict OdaiMember
Craig IngramMember
KayyuriMember
Scott SuarezMember
Agent2Agent (A2A) BotMember
Andreas AbelMember
Aadi KapurMember
Aadish GoelMember
Aahil MehtaMember
Work History
April 2026
1 Commits • 1 Features
Apr 1, 2026April 2026: Delivered a new Resource-Sharing Pass Folding Action Selection API for google/xls, encapsulating the folding decision logic into a new virtual method to improve modularity, maintainability, and extensibility. The API enables parameter-driven resource-sharing decisions, laying groundwork for future performance optimizations in resource-constrained environments. All changes are committed with traceability (Commit: 9a7ea62405cb69689d19ce3e7c868d585a63f595; PiperOrigin-RevId: 895509239).
1 Commits • 1 Features
Apr 1, 2026April 2026: Delivered a new Resource-Sharing Pass Folding Action Selection API for google/xls, encapsulating the folding decision logic into a new virtual method to improve modularity, maintainability, and extensibility. The API enables parameter-driven resource-sharing decisions, laying groundwork for future performance optimizations in resource-constrained environments. All changes are committed with traceability (Commit: 9a7ea62405cb69689d19ce3e7c868d585a63f595; PiperOrigin-RevId: 895509239).
April 2026
March 2026
2 Commits • 1 Features
Mar 1, 2026March 2026 – google/xls: Key feature delivered was Graph Analysis Enhancements, including a new method to compute connected components in the folding graph and an extended ComputeMutualExclusionAnalysis API with customizable node filtering and API cleanup. Major bugs fixed: None reported for this repository this month. Overall impact: improves accuracy, flexibility, and maintainability of graph-based concurrency analysis in resource sharing, enabling more reliable decisions and reducing manual analysis effort. Technologies demonstrated: graph algorithms, API design and cleanup, and integration with existing passes.
March 2026
2 Commits • 1 Features
Mar 1, 2026March 2026 – google/xls: Key feature delivered was Graph Analysis Enhancements, including a new method to compute connected components in the folding graph and an extended ComputeMutualExclusionAnalysis API with customizable node filtering and API cleanup. Major bugs fixed: None reported for this repository this month. Overall impact: improves accuracy, flexibility, and maintainability of graph-based concurrency analysis in resource sharing, enabling more reliable decisions and reducing manual analysis effort. Technologies demonstrated: graph algorithms, API design and cleanup, and integration with existing passes.
January 2026
4 Commits • 2 Features
Jan 1, 2026January 2026 summary: Delivered API accessibility enhancements for the Resource Sharing pass in google/xls, enabling easier cross-component integration, and completed comprehensive code quality and safety improvements across core utilities. Impact includes reduced clang-tidy warnings, safer API usage through explicit constructors, and streamlined build hygiene. Business value: faster partner integrations, lower maintenance cost, and more robust, reusable core utilities. Key technologies demonstrated: C++, header management, API design, and static analysis.
4 Commits • 2 Features
Jan 1, 2026January 2026 summary: Delivered API accessibility enhancements for the Resource Sharing pass in google/xls, enabling easier cross-component integration, and completed comprehensive code quality and safety improvements across core utilities. Impact includes reduced clang-tidy warnings, safer API usage through explicit constructors, and streamlined build hygiene. Business value: faster partner integrations, lower maintenance cost, and more robust, reusable core utilities. Key technologies demonstrated: C++, header management, API design, and static analysis.
January 2026
December 2025
4 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary for google/xls: Delivered two major features that improve IR traceability during cloning and enhance the folding pass with legality reporting and area estimation. Performed code cleanup by removing an unused parameter in the resource sharing pass. Documentation clarifications updated to reflect new capabilities.
December 2025
4 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary for google/xls: Delivered two major features that improve IR traceability during cloning and enhance the folding pass with legality reporting and area estimation. Performed code cleanup by removing an unused parameter in the resource sharing pass. Documentation clarifications updated to reflect new capabilities.
September 2025
2 Commits • 2 Features
Sep 1, 2025September 2025 monthly summary for google/xls: Key features delivered and major accomplishments focusing on performance improvements in the XLS compiler's negation handling. Two targeted narrowing-pass optimizations were implemented in the IR to improve efficiency for negation operations. No major bugs documented in this period. Overall impact: faster builds and more efficient code generation through reduced IR workload and narrower bit-widths. Technologies demonstrated: IR-level optimization, bit-width analysis, MSB/predictability detection, trailing-zero handling, and robust Git commit discipline.
2 Commits • 2 Features
Sep 1, 2025September 2025 monthly summary for google/xls: Key features delivered and major accomplishments focusing on performance improvements in the XLS compiler's negation handling. Two targeted narrowing-pass optimizations were implemented in the IR to improve efficiency for negation operations. No major bugs documented in this period. Overall impact: faster builds and more efficient code generation through reduced IR workload and narrower bit-widths. Technologies demonstrated: IR-level optimization, bit-width analysis, MSB/predictability detection, trailing-zero handling, and robust Git commit discipline.
September 2025
July 2025
1 Commits • 1 Features
Jul 1, 20252025-07 monthly summary: Delivered a major performance feature in google/xls by enhancing Resource Sharing Memoization, achieving >10x speedup in the BDD engine through optimized node-side-effect and def-use analysis. No critical bugs reported this month. Overall impact: faster resource-sharing pass enables larger workloads, faster builds, and improved runtime responsiveness. Technologies/skills demonstrated: advanced memoization, performance profiling, BDD internals, and commit-level impact.
July 2025
1 Commits • 1 Features
Jul 1, 20252025-07 monthly summary: Delivered a major performance feature in google/xls by enhancing Resource Sharing Memoization, achieving >10x speedup in the BDD engine through optimized node-side-effect and def-use analysis. No critical bugs reported this month. Overall impact: faster resource-sharing pass enables larger workloads, faster builds, and improved runtime responsiveness. Technologies/skills demonstrated: advanced memoization, performance profiling, BDD internals, and commit-level impact.
June 2025
2 Commits • 1 Features
Jun 1, 20252025-06 Monthly Summary for google/xls: Delivered a significant IR-level optimization improvement via an expanded Resource Sharing Pass, focusing on area efficiency and performance trade-offs through delay-aware folding.
2 Commits • 1 Features
Jun 1, 20252025-06 Monthly Summary for google/xls: Delivered a significant IR-level optimization improvement via an expanded Resource Sharing Pass, focusing on area efficiency and performance trade-offs through delay-aware folding.
June 2025
May 2025
5 Commits • 2 Features
May 1, 2025May 2025: Delivered correctness and performance improvements to the Resource Sharing Pass in google/xls, along with test suite modernization. Impact includes faster builds, more robust folding decisions, and reduced maintenance burden, enabling scalable IR optimization.
May 2025
5 Commits • 2 Features
May 1, 2025May 2025: Delivered correctness and performance improvements to the Resource Sharing Pass in google/xls, along with test suite modernization. Impact includes faster builds, more robust folding decisions, and reduced maintenance burden, enabling scalable IR optimization.
April 2025
6 Commits • 2 Features
Apr 1, 2025April 2025 (2025-04) monthly summary for google/xls: Delivered core IR optimization passes focused on performance, correctness, and maintainability in the XLS compiler. Implemented and extended resource sharing optimization to fold identical IR multiplications, with flag-based enablement and extended coverage across def-use chains, select cases, and varying bit-widths. Added a pass to merge consecutive PrioritySelect and OneHotSelect operations to simplify the IR and improve pipeline efficiency. Strengthened correctness by refining mutual-exclusivity analysis to properly classify multiplications in non post-dominated scenarios. All changes accompanied by unit/integration tests to guard regressions and support safe rollout.
6 Commits • 2 Features
Apr 1, 2025April 2025 (2025-04) monthly summary for google/xls: Delivered core IR optimization passes focused on performance, correctness, and maintainability in the XLS compiler. Implemented and extended resource sharing optimization to fold identical IR multiplications, with flag-based enablement and extended coverage across def-use chains, select cases, and varying bit-widths. Added a pass to merge consecutive PrioritySelect and OneHotSelect operations to simplify the IR and improve pipeline efficiency. Strengthened correctness by refining mutual-exclusivity analysis to properly classify multiplications in non post-dominated scenarios. All changes accompanied by unit/integration tests to guard regressions and support safe rollout.
April 2025
March 2025
3 Commits • 2 Features
Mar 1, 2025March 2025 for google/xls: Implemented binary priority select support in the receive_default_value_simplification path, including IsBinaryPrioritySelect helper and extended matching logic to handle both Select and PrioritySelect; added TransformableConditionalReceiveWithPrioritySelect test. Introduced a dedicated select_merging_pass to consolidate PrioritySelect and OneHotSelect optimizations, deferred merging to avoid blocking other passes, and refactored tests and build config to reflect structural changes. These changes improve correctness and reliability of optimization passes, modularize the pipeline for future enhancements, and reduce build fragility, with tests updated accordingly.
March 2025
3 Commits • 2 Features
Mar 1, 2025March 2025 for google/xls: Implemented binary priority select support in the receive_default_value_simplification path, including IsBinaryPrioritySelect helper and extended matching logic to handle both Select and PrioritySelect; added TransformableConditionalReceiveWithPrioritySelect test. Introduced a dedicated select_merging_pass to consolidate PrioritySelect and OneHotSelect optimizations, deferred merging to avoid blocking other passes, and refactored tests and build config to reflect structural changes. These changes improve correctness and reliability of optimization passes, modularize the pipeline for future enhancements, and reduce build fragility, with tests updated accordingly.
November 2024
7 Commits • 1 Features
Nov 1, 2024In 2024-11, delivered the Select Lifting optimization pass for arrays in the XLS compiler (google/xls), delivering measurable performance improvements and reduced hardware area on array-heavy code paths. The feature transforms select operations on arrays into a two-step select/index followed by a single array access, enabling more compact hardware and faster execution. The work includes generalization of applicability and profitability guards to accommodate different input types, support for select nodes with no cases, and comprehensive test coverage to prevent regressions. In addition to implementing the core optimization, the changes included targeted refactors and naming improvements to improve maintainability.
7 Commits • 1 Features
Nov 1, 2024In 2024-11, delivered the Select Lifting optimization pass for arrays in the XLS compiler (google/xls), delivering measurable performance improvements and reduced hardware area on array-heavy code paths. The feature transforms select operations on arrays into a two-step select/index followed by a single array access, enabling more compact hardware and faster execution. The work includes generalization of applicability and profitability guards to accommodate different input types, support for select nodes with no cases, and comprehensive test coverage to prevent regressions. In addition to implementing the core optimization, the changes included targeted refactors and naming improvements to improve maintainability.
November 2024
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Quality Metrics
Correctness89.4%
Maintainability86.4%
Architecture87.4%
Performance81.0%
AI Usage24.8%
Skills & Technologies
Programming Languages
C++Python
Technical Skills
API DesignAPI DevelopmentAPI designAlgorithm DesignBDDBDD (Binary Decision Diagrams)Bit ManipulationBug FixingBuild System ConfigurationC++C++ developmentC++ programmingCode AnalysisCode GenerationCode Optimization
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