CakeML/cakeml
Nov 2024 – May 2026
10 Months active
Languages Used
SMLGitGit IgnoreNoneShellStandard MLML
Technical Skills
Abstract Syntax Trees (AST)Compiler DesignCompiler DevelopmentFormal VerificationGrammar EngineeringParsing
Michael Norrish
PROFILE
Michael Norrish
No features or bug fixes were contributed during the period covered by this profile, and as such, there is no engineering work to summarize for the associated repository. The developer did not build or modify any systems, nor did they address any issues or implement new functionality. Consequently, there were no technical approaches, programming languages, or technologies applied in the context of this repository. Without any code changes, feature development, or problem-solving activities, the profile does not reflect any depth of engineering work or demonstrate the use of specific skills. The repository remains unchanged throughout the reported timeframe.
Overall Statistics
Feature vs Bugs
68%Features
Repository Contributions
67Total
Bugs
10
Commits
67
Features
21
Lines of code
828,730
Activity Months10
Your Network
84 peopleShared Repositories
26
wildptrMember
Mario CarneiroMember
minhddoMember
minhddoMember
Halogen TruongMember
Halogen TruongMember
Hrutvik KanabarMember
Johannes Åman PohjolaMember
Jared YeagerMember
Work History
May 2026
2 Commits • 1 Features
May 1, 2026May 2026: Focused on strengthening line-based IO semantics and the accompanying formal proofs in CakeML/cakeml. Delivered clearer InputLine specifications with explicit terminator handling, improved proof script correctness for input line handling, and established a more maintainable foundation for future IO-related changes. Resulting in more predictable parsing behavior, reduced ambiguity, and safer refactors for downstream users and tools.
2 Commits • 1 Features
May 1, 2026May 2026: Focused on strengthening line-based IO semantics and the accompanying formal proofs in CakeML/cakeml. Delivered clearer InputLine specifications with explicit terminator handling, improved proof script correctness for input line handling, and established a more maintainable foundation for future IO-related changes. Resulting in more predictable parsing behavior, reduced ambiguity, and safer refactors for downstream users and tools.
May 2026
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026 — CakeML/cakeml: Delivered a major TextIO API enhancement that clarifies and simplifies line-based input, delivering immediate developer value and setting the stage for further IO improvements. The change introduces a new entry-point and clarifies naming for existing functionality, with careful migration to preserve compatibility.
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026 — CakeML/cakeml: Delivered a major TextIO API enhancement that clarifies and simplifies line-based input, delivering immediate developer value and setting the stage for further IO improvements. The change introduces a new entry-point and clarifies naming for existing functionality, with careful migration to preserve compatibility.
October 2025
3 Commits • 1 Features
Oct 1, 2025October 2025 monthly summary focused on delivering robust numeric literal handling in CakeML and stabilizing the translation/evaluation path for floating-point values.
3 Commits • 1 Features
Oct 1, 2025October 2025 monthly summary focused on delivering robust numeric literal handling in CakeML and stabilizing the translation/evaluation path for floating-point values.
October 2025
September 2025
4 Commits • 3 Features
Sep 1, 2025Month: 2025-09 — This month delivered foundational numeric enhancements in CakeML/cakeml that reduce type errors, simplify numeric programming, and improve maintainability. Key changes include integrating FLOAT64 as an equality type in the standard type system, expanding the Float64 library API with new entry points, and cleaning up the Double module with additional double-precision entry points. No critical bugs were reported; work emphasized correctness, usability, and code health to accelerate future math-heavy feature work and reduce maintenance costs.
September 2025
4 Commits • 3 Features
Sep 1, 2025Month: 2025-09 — This month delivered foundational numeric enhancements in CakeML/cakeml that reduce type errors, simplify numeric programming, and improve maintainability. Key changes include integrating FLOAT64 as an equality type in the standard type system, expanding the Float64 library API with new entry points, and cleaning up the Double module with additional double-precision entry points. No critical bugs were reported; work emphasized correctness, usability, and code health to accelerate future math-heavy feature work and reduce maintenance costs.
August 2025
22 Commits • 4 Features
Aug 1, 2025August 2025 monthly summary for CakeML/cakeml focused on stabilizing core numeric semantics, strengthening build reliability, and expanding tooling to accelerate future work. The work delivered during the month improves type inference correctness, build stability, and developer tooling, delivering measurable business value through faster iteration, fewer CI/build failures, and stronger numeric proving capabilities.
22 Commits • 4 Features
Aug 1, 2025August 2025 monthly summary for CakeML/cakeml focused on stabilizing core numeric semantics, strengthening build reliability, and expanding tooling to accelerate future work. The work delivered during the month improves type inference correctness, build stability, and developer tooling, delivering measurable business value through faster iteration, fewer CI/build failures, and stronger numeric proving capabilities.
August 2025
July 2025
20 Commits • 5 Features
Jul 1, 2025During 2025-07, CakeML/cakeml delivered substantive revisions to RevisedFloats semantics across the interpreter and translator stacks, stabilized the itree/semantics/closure pipeline, and completed tooling and maintenance to support these changes. Notable work includes finishing smallStepProps, BigStep equivalence, and itree_semanticsProps with explicit interpTheory dependencies; extensive fixes to translator components to enable revisedFloats builds; SML script tooling improvements; and repository hygiene improvements. This work improves numeric reliability, cross-component consistency, and downstream translator/demos readiness, while addressing optimisation and theorem-shape concerns. The outputs support more robust numeric reasoning, easier maintenance, and smoother integration for downstream users and projects.
July 2025
20 Commits • 5 Features
Jul 1, 2025During 2025-07, CakeML/cakeml delivered substantive revisions to RevisedFloats semantics across the interpreter and translator stacks, stabilized the itree/semantics/closure pipeline, and completed tooling and maintenance to support these changes. Notable work includes finishing smallStepProps, BigStep equivalence, and itree_semanticsProps with explicit interpTheory dependencies; extensive fixes to translator components to enable revisedFloats builds; SML script tooling improvements; and repository hygiene improvements. This work improves numeric reliability, cross-component consistency, and downstream translator/demos readiness, while addressing optimisation and theorem-shape concerns. The outputs support more robust numeric reasoning, easier maintenance, and smoother integration for downstream users and projects.
June 2025
7 Commits • 2 Features
Jun 1, 2025June 2025 monthly summary for CakeML/cakeml: Strengthened floating-point support, verification, and maintainability to enable reliable numeric computations and faster future iteration. Key features delivered include FP representation cleanup with semantic verification, standardization of FP equality, and the introduction of Float64 literals in the AST along with consolidation of FP AST definitions. These changes reduce system complexity, improve formal guarantees, and pave the way for FP-related optimizations. Impact and value: Enhanced correctness and safety of floating-point semantics, reduced maintenance burden through refactoring and consolidation, and a clearer path for future language features and tooling around numeric types. Technologies/skills demonstrated: Formal verification and proof management in semantic models, SML-based scripting and tooling, semantic and AST redesign, and systematic removal of obsolete FP components.
7 Commits • 2 Features
Jun 1, 2025June 2025 monthly summary for CakeML/cakeml: Strengthened floating-point support, verification, and maintainability to enable reliable numeric computations and faster future iteration. Key features delivered include FP representation cleanup with semantic verification, standardization of FP equality, and the introduction of Float64 literals in the AST along with consolidation of FP AST definitions. These changes reduce system complexity, improve formal guarantees, and pave the way for FP-related optimizations. Impact and value: Enhanced correctness and safety of floating-point semantics, reduced maintenance burden through refactoring and consolidation, and a clearer path for future language features and tooling around numeric types. Technologies/skills demonstrated: Formal verification and proof management in semantic models, SML-based scripting and tooling, semantic and AST redesign, and systematic removal of obsolete FP components.
June 2025
May 2025
2 Commits • 1 Features
May 1, 2025May 2025 monthly summary: Delivered significant simplifications and robustness improvements in CakeML semantics, with a focus on floating-point representation and formal proofs. Key features and fixes implemented were targeted at improving maintainability, correctness, and integration readiness across the CakeML codebase. Overall impact: Reduced FP semantics complexity by unifying floating-point numbers to Word64, removed FP-trees from semantics, and realigned the AST and evaluation logic accordingly. This simplification reduces potential FP edge-case bugs, eases future optimizations, and improves cross-component consistency. The updated FP operation handling leads to simpler, more maintainable code paths and clearer semantics for downstream verification and compilation stages. Proof and verification improvements: Corrected the proof strategy for the find_index_NOT_MEM theorem to accommodate HOL changes in option rewrites. Core functionality remains intact, but the proof methodology is now more robust against evolving HOL rewrites, decreasing risk of regressions in future HOL changes. Technologies/skills demonstrated: Formal semantics design and refactor (FP unification to Word64, AST/eval alignment), FP operation simplification, HOL-based proof maintenance and adaptation, and disciplined commit-level traceability for maintainable, verifiable changes. Top achievements (highlights): - Unified floating-point representation in CakeML semantics (commit 4a37c7e1b371fbc4db4cedeb3a80479be0424b77). - Updated proof strategy for find_index_NOT_MEM after HOL changes in option rewrites (commit 12bcf2eec6c8f0781b007ee82dc0bf0b66169b10). - Refactored semantics and evaluation logic to align with the unified FP model, streamlining FP operation handling and reducing future maintenance burden.
May 2025
2 Commits • 1 Features
May 1, 2025May 2025 monthly summary: Delivered significant simplifications and robustness improvements in CakeML semantics, with a focus on floating-point representation and formal proofs. Key features and fixes implemented were targeted at improving maintainability, correctness, and integration readiness across the CakeML codebase. Overall impact: Reduced FP semantics complexity by unifying floating-point numbers to Word64, removed FP-trees from semantics, and realigned the AST and evaluation logic accordingly. This simplification reduces potential FP edge-case bugs, eases future optimizations, and improves cross-component consistency. The updated FP operation handling leads to simpler, more maintainable code paths and clearer semantics for downstream verification and compilation stages. Proof and verification improvements: Corrected the proof strategy for the find_index_NOT_MEM theorem to accommodate HOL changes in option rewrites. Core functionality remains intact, but the proof methodology is now more robust against evolving HOL rewrites, decreasing risk of regressions in future HOL changes. Technologies/skills demonstrated: Formal semantics design and refactor (FP unification to Word64, AST/eval alignment), FP operation simplification, HOL-based proof maintenance and adaptation, and disciplined commit-level traceability for maintainable, verifiable changes. Top achievements (highlights): - Unified floating-point representation in CakeML semantics (commit 4a37c7e1b371fbc4db4cedeb3a80479be0424b77). - Updated proof strategy for find_index_NOT_MEM after HOL changes in option rewrites (commit 12bcf2eec6c8f0781b007ee82dc0bf0b66169b10). - Refactored semantics and evaluation logic to align with the unified FP model, streamlining FP operation handling and reducing future maintenance burden.
December 2024
1 Commits
Dec 1, 2024December 2024 monthly summary for CakeML/cakeml: Implemented targeted proof verification improvements in cmlPtreeConversionPropsScript.sml by correcting and refactoring proof obligations, adjusting the nE constructor, and adding new nPEsfx cases to boost accuracy and completeness. These changes address gaps in the verification pipeline, reducing the likelihood of incorrect proofs and lowering downstream debugging effort. The work was committed as d8e4b557fdf4443759cec20fccf35ea64046035b (Fix cmlPtreeConversionProps). Overall impact includes more reliable formal verification, improved maintainability of the proof scripts, and stronger confidence in release-ready proofs. Technologies/skills demonstrated include SML, formal verification, code refactoring, and change traceability through commits.
1 Commits
Dec 1, 2024December 2024 monthly summary for CakeML/cakeml: Implemented targeted proof verification improvements in cmlPtreeConversionPropsScript.sml by correcting and refactoring proof obligations, adjusting the nE constructor, and adding new nPEsfx cases to boost accuracy and completeness. These changes address gaps in the verification pipeline, reducing the likelihood of incorrect proofs and lowering downstream debugging effort. The work was committed as d8e4b557fdf4443759cec20fccf35ea64046035b (Fix cmlPtreeConversionProps). Overall impact includes more reliable formal verification, improved maintainability of the proof scripts, and stronger confidence in release-ready proofs. Technologies/skills demonstrated include SML, formal verification, code refactoring, and change traceability through commits.
December 2024
November 2024
5 Commits • 3 Features
Nov 1, 2024November 2024 — CakeML/cakeml focused on robust parsing, formal verification, and test-performance improvements to enable safer releases and faster feedback loops. Delivered three aligned outcomes: (1) enhanced expression parsing and AST handling to support case-of, if-then-else, raise expressions, and pattern matching; (2) formal proofs of PEG parser soundness with strengthened completeness guarantees for grammar robustness; (3) test-suite conversion performance optimization by removing unnecessary choice-point preservation in cmlPtreeConversion. Overall impact: reduced regression risk, stronger language guarantees, and improved developer velocity.
November 2024
5 Commits • 3 Features
Nov 1, 2024November 2024 — CakeML/cakeml focused on robust parsing, formal verification, and test-performance improvements to enable safer releases and faster feedback loops. Delivered three aligned outcomes: (1) enhanced expression parsing and AST handling to support case-of, if-then-else, raise expressions, and pattern matching; (2) formal proofs of PEG parser soundness with strengthened completeness guarantees for grammar robustness; (3) test-suite conversion performance optimization by removing unnecessary choice-point preservation in cmlPtreeConversion. Overall impact: reduced regression risk, stronger language guarantees, and improved developer velocity.
Activity
Loading activity data...
Quality Metrics
Correctness90.4%
Maintainability86.2%
Architecture85.0%
Performance80.6%
AI Usage21.6%
Skills & Technologies
Programming Languages
GitGit IgnoreMLNoneSMLShellStandard ML
Technical Skills
API developmentAbstract Syntax TreesAbstract Syntax Trees (AST)Backend DevelopmentBuild System ConfigurationBuild System ManagementBuild SystemsCode CleanupCompiler DesignCompiler DevelopmentCompiler OptimizationConfiguration ManagementCore DevelopmentFloating-Point ArithmeticFormal Semantics
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline