perf: borrow instruction stream across unbudgeted tail dispatch - #64
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Draft: standalone tail-dispatch change on
next. This PR no longer depends on the closed #63.Unbudgeted tail dispatch borrows the current function's instruction slice across opcode handlers and retains its
Shared<WasmFunction>owner. It rebinds only after a function switch. Fuel/time-budgeted dispatch is unchanged, and no unsafe code is added. A focused test covers linked modules, a host import, indirect calls, returns, and fuel suspension.The focused local test passes after rebasing. A full local workspace run stopped while compiling dependencies because the build volume filled; no full-suite result is claimed.
Earlier device measurements compared this change against #63, not upstream
next. They should not be used as standalone results. This PR remains draft until we can remeasure A14 efficiency-core PMU and A12/A13 wall time against the current base, including the previously observed short-call regressions.