Tag
deoptimization
- Sep 19, 2026 Cache Miss Handling and Patching Code at the Access Site What happens on the first execution of a property access, how the runtime rewrites the site without breaking other threads, and why the patched instruction must be safe to overwrite atomically. language runtimes
- Jul 23, 2026 Prototype Chain Guards and Validity Cells Why a compiled access through a prototype is invalidated by an assignment to the prototype rather than by a failed layout check, and how a one-word cell makes that invalidation cheap. language runtimes
- Apr 24, 2026 Tiered Compilation and Deoptimization: Undoing a Speculation How a runtime decides when to compile, what a speculation record contains, and how execution resumes in the interpreter when a guard fails. programming languages
- Oct 8, 2025 Deoptimization and Frame State Reconstruction What must be rebuilt when compiled code abandons a speculative assumption, how the compiler describes frame state at each guard, and why the metadata is the expensive part of the mechanism. language runtimes
- Sep 23, 2025 Tiered Compilation and On-Stack Replacement Why runtimes compile the same method more than once, how a frame in the middle of an interpreted loop moves into optimized code, and what the transfer must reconstruct. language runtimes
- Aug 13, 2024 Type Feedback and the Speculation Budget How a runtime decides what to speculate about from what the interpreter observed, why the counters that trigger optimization are the same counters that guard it, and what happens when a speculative bet loses. language runtimes