Concise monthly summary for 2025-12 focusing on business value and technical achievements for the halide/Halide repository. Key features delivered: - Enhanced Algebraic Expression Simplification: Added new rewrite rules to simplify subtraction and division in algebraic expressions within Halide's compiler, increasing expression simplification efficiency. Includes new tests to validate correctness. Major bugs fixed: - No explicit major bugs recorded for this month in the provided data. (If there were, they would be listed here with links/commit references.) Overall impact and accomplishments: - Delivered a targeted compiler optimization that reduces expression complexity, enabling faster compilation and potentially faster generated code for math-heavy pipelines. The change lays groundwork for further algebraic optimizations and improves reliability of simplification passes. - Strengthened test coverage around algebraic simplification, improving long-term maintainability and confidence in refactoring. Technologies/skills demonstrated: - C++/Compiler internals and rewrite-rule based optimization - Test-driven development and regression testing - Git-based workflow and commit hygiene, including traceability to issue #8902

November 2025: Implemented RISC-V Backend Canonicalization Optimization by adding a canonicalization pattern to replace self-subtraction with a zero-register operation. This eliminates redundant instructions and improves code generation performance. Commit a793689a020e0376b5c15ddba231af8c6e8bf571. Business value: faster generation of RISC-V code and potential reductions in emitted instruction count and binary size. Demonstrated skills: compiler backend optimization, pattern-based transformations, and disciplined source control.