perf(codegen): drop roots for number-only locals - #8540
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Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe compiler now removes shadow-root slots for function-local bindings proven to contain only non-pointer Number values. Tests verify that specialized typed-array clones drop these roots while generic bodies retain conservative roots. Benchmark results and proof constraints are documented. ChangesNumeric local root elimination
Estimated code review effort: 2 (Simple) | ~15 minutes Merge Risk: ⚪ Minimal · up to The change narrowly removes roots for proven number-only locals while retaining conservative handling for opaque and captured values; no actionable merge-blocking risk remains after normal checks and review. Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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Inline comments:
In `@changelog.d/8540-number-local-root-slots.md`:
- Around line 3-4: Update the changelog text to keep “Number-by-construction” as
a single uninterrupted compound term, removing the line break or spacing that
renders it as “Number- by-construction.”
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changelog.d/8540-number-local-root-slots.mdcrates/perry-codegen/src/codegen/function.rscrates/perry-codegen/src/codegen/ordinary_param_guard_tests.rs
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Inline comments:
In `@crates/perry-codegen/src/codegen/function.rs`:
- Around line 873-893: Move numeric-binding collection and native
number-by-construction filtering ahead of parameter binding emission in the
function codegen flow, so elided parameter slots are excluded before
js_shadow_slot_bind is generated. Preserve entry-block bindings for all
non-elided parameters before any collecting instruction, and add an IR
regression covering a declared Number or Int32 parameter proven
number-by-construction; update the logic around
elide_proven_numeric_shadow_slots and bound_param_slots.
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crates/perry-codegen/src/codegen/function.rscrates/perry-codegen/src/codegen/ordinary_param_guard_tests.rs
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Summary
Number/Int32locals that the specialization-aware whole-write analysis independently proves Number-by-constructionAnyandUnknownbindings conservative even when inferred local types or arithmetic facts look numericAnyreceiversRooting correctness
The optimization uses two independent requirements: a declaration allowlist (
Number/Int32) and the annotation-agnostic whole-write Number proof. Inferredlocal_typesare deliberately excluded from the allowlist because they can refine anAnydeclaration. A direct set-intersection unit test pins that a local satisfying only one requirement retains its slot. Boxed/captured locals and module globals remain excluded by the existing proof, and generic fallback bodies retain conservative slots.The frame keeps its original upper-bound size; filtering only prevents bindings, root stores, clears, and barriers for admitted locals, so surviving preassigned indices remain valid.
Performance
The measured branch reduced
typed_arrayfrom 56.669 B to 56.013 B retired instructions (-1.16%), with all 20 corpus outputs byte-exact and checksum-821955270. The safety repair narrows the candidate set to declared numeric bindings; it keeps the benchmark target (let n: number) eligible while opaque locals remain rooted.Validation
cargo test --release -p perry-codegen --lib: 1123 passedargless_builtin_extra_args: 4/4 passed; refreshed CI also confirms the previous exact-once receiver failure is gonecargo fmt --all -- --checkgit diff --checkmain: the file-size/raw-handle lint gates plus pre-existingnative_proof_regressionsandtemp_root_operand_temporariesintegration assertionsNo version bump.
Closes #8496.
Summary by CodeRabbit