google/heir
Jun 2026 – Jun 2026
1 Month active
Languages Used
C++MLIR
Technical Skills
AST ManipulationC++C++ developmentCompiler DesignCompiler designMLIR
Wenhao Zhang
PROFILE
Wenhao Zhang
Worked on the google/heir repository to enhance the CCMM backend by implementing emitter handlers for Boolean OR and XOR operations, broadening compilation support and reducing translation gaps. Addressed four critical bugs, including correcting domain shift calculations in LowerViaPatersonStockmeyerChebyshev and improving emission logic for zdiv_r by eliminating redundant comparisons. Fixed a precision issue in the bicyclic matrix multiplication pipeline and expanded end-to-end testing across three backends, increasing reliability and robustness. Leveraged C++, MLIR, and advanced compiler design techniques, with a focus on AST manipulation, algorithm design, and comprehensive test-driven development to improve math correctness and deployment confidence.
Overall Statistics
Feature vs Bugs
20%Features
Repository Contributions
5Total
Bugs
4
Commits
5
Features
1
Lines of code
391
Activity Months1
Your Network
5020 peopleSame Organization
@google.com4953
Benedict OdaiMember
Craig IngramMember
KayyuriMember
Scott SuarezMember
Agent2Agent (A2A) BotMember
Andreas AbelMember
Aadi KapurMember
Aadish GoelMember
Aahil MehtaMember
Work History
June 2026
5 Commits • 1 Features
Jun 1, 2026Month: 2026-06 — Concise summary focusing on business value and technical achievements for google/heir. Key features delivered: - Implemented emitter handlers for Boolean OR and XOR operations in CCMM, broadening compilation capabilities and reducing translation gaps. (Commit: ef1e3420caf9ac177d829939a6be82e4f643f25f) Major bugs fixed: - LowerViaPatersonStockmeyerChebyshev Domain Shift Correction: negated the shift value to align with the intended formula and added a regression test to validate behavior. (Commit: 0cc96766edea9d736333443b54a0b388ce66be7c) - Zdiv_r Emission Fix: Removed redundant double-comparison and directly emits the remainder (arith::RemSIOp), improving correctness and efficiency. (Commit: 34cf0bfdce2db0d1ee37789ed0a78616d0b47a30) - Bicyclic Matrix Multiplication Precision Fix and End-to-End Tests: fixed a precision error in the CCMM pipeline and expanded testing with end-to-end coverage across three backends. (Commit: 8508a520ffaf485f6d06d3b04a8865debd814c0a) - Plaintext Bicyclic Matrix Multiplication Test Robustness: addressed use-of-uninitialized-value and rank mismatch to improve robustness. (Commit: d42f67bece5166514b30827cf69b7a3cd4e75a38) Overall impact and accomplishments: - Improved math correctness, reliability, and performance for critical CCMM paths, reducing defect surface in production releases. - Expanded cross-backend validation via end-to-end tests, increasing confidence in deployment across different backends. - Strengthened test coverage and robustness, leading to faster identification and squashing of edge-case issues. Technologies/skills demonstrated: - CCMM backend emission and code-generation techniques, AST translation, and test-driven development. - Cross-backend end-to-end testing, regression testing, and robustness improvements in matrix-multiplication workflows.
5 Commits • 1 Features
Jun 1, 2026Month: 2026-06 — Concise summary focusing on business value and technical achievements for google/heir. Key features delivered: - Implemented emitter handlers for Boolean OR and XOR operations in CCMM, broadening compilation capabilities and reducing translation gaps. (Commit: ef1e3420caf9ac177d829939a6be82e4f643f25f) Major bugs fixed: - LowerViaPatersonStockmeyerChebyshev Domain Shift Correction: negated the shift value to align with the intended formula and added a regression test to validate behavior. (Commit: 0cc96766edea9d736333443b54a0b388ce66be7c) - Zdiv_r Emission Fix: Removed redundant double-comparison and directly emits the remainder (arith::RemSIOp), improving correctness and efficiency. (Commit: 34cf0bfdce2db0d1ee37789ed0a78616d0b47a30) - Bicyclic Matrix Multiplication Precision Fix and End-to-End Tests: fixed a precision error in the CCMM pipeline and expanded testing with end-to-end coverage across three backends. (Commit: 8508a520ffaf485f6d06d3b04a8865debd814c0a) - Plaintext Bicyclic Matrix Multiplication Test Robustness: addressed use-of-uninitialized-value and rank mismatch to improve robustness. (Commit: d42f67bece5166514b30827cf69b7a3cd4e75a38) Overall impact and accomplishments: - Improved math correctness, reliability, and performance for critical CCMM paths, reducing defect surface in production releases. - Expanded cross-backend validation via end-to-end tests, increasing confidence in deployment across different backends. - Strengthened test coverage and robustness, leading to faster identification and squashing of edge-case issues. Technologies/skills demonstrated: - CCMM backend emission and code-generation techniques, AST translation, and test-driven development. - Cross-backend end-to-end testing, regression testing, and robustness improvements in matrix-multiplication workflows.
June 2026
Activity
Loading activity data...
Quality Metrics
Correctness96.0%
Maintainability80.0%
Architecture80.0%
Performance84.0%
AI Usage24.0%
Skills & Technologies
Programming Languages
C++MLIR
Technical Skills
AST ManipulationC++C++ developmentCompiler DesignCompiler designMLIRSoftware engineeringalgorithm designcompiler designend-to-end testingmatrix multiplicationtestingunit testing
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline