This month focused on performance enhancements and code hygiene for the EVM semantics project. Implemented 256-bit machine integers (MInt{256}) for the EVM word stack and related types to boost performance and ensure consistency across K definitions; cleaned up the semantics implementation by removing unused productions and outdated documentation, reducing maintenance surface and potential misinterpretations.

December 2024 — Key delivery: Proof Trace Enhancement for Tail Call Tracking in runtimeverification/llvm-backend. Implemented a new proof trace event to capture tail call information by adding 'function exit' events to proof output diffs, enabling precise tracking of calls and returns during debugging and verification. This lays groundwork for improved correctness proofs and easier debugging of tail-call optimizations. The work is tracked in commit 6df5ac59b20c21186a2e007f8ac58586ab8a51a3 with message 'Create proof trace event for tail call information (#1179)'.