iter operator-routing-eq-ord.1 (DONE 13/13): drop comparator builtins, route through Eq/Ord
Closes Gitea #1. Realises the "P2 follow-up" called out in examples/prelude.ail:9 — removes the surface comparator names `==` / `!=` / `<` / `<=` / `>` / `>=` from the language entirely, routes the LLM-author's `(app eq …)` / `(app compare …)` / `(app ne|lt|le|gt|ge …)` through prelude.Eq / prelude.Ord class- dispatch, ships six named Float-comparison fns (`float_eq`/`float_ne`/`float_lt`/`float_le`/`float_gt`/`float_ge`) so Float keeps comparability without an Eq/Ord instance, and emits primitive instance bodies with `alwaysinline` so the -O0 IR shape stays at one instruction per comparison. Plan-task journal (13 tasks, single atomic iter per Approach A): Task 1 — Bootstrap: 4 new fixtures (eq_user_adt_smoke.ail, eq_float_must_fail.ail, float_compare_smoke.ail, operator_unbound_check.ail) + 5 new E2E/pin tests as RED starting state. All 5 confirmed RED at start: north-star fixed `NoInstance Eq Unit` (preserved by Unit-eq opening line intentionally added in plan-self-review); float_compare unknown `float_eq`; operator-name typechecked (== still polymorphic); must-fail diagnostic lacked `float_eq`; alwaysinline absent from IR. Task 2 — Codegen alwaysinline + intercept arms: introduced `intercept_emit_wants_alwaysinline` allowlist + appended ` alwaysinline` between `)` and `{` of the `define` line in `emit_fn`; added 9 new intercept arms to `try_emit_primitive_instance_body` — `eq__Int`/`eq__Bool`/ `eq__Unit` + the six `float_*` arms. Task 3 — Prelude reshape: `instance Eq Unit` added; Eq Int/Bool bodies become placeholder-`false` (intercept overrides); six `float_*` free fns added; line-9 P2-follow-up comment removed. Lockstep hash re-pins: prelude_module_hash_pin (3abe0d3fa3c11c99 → new), mono_hash_stability six body-hash literals (eq__Int/Bool/Str + compare__Int/Bool/Str all shifted because placeholder body changes the canonical hash). IR-snapshot regen (hello/list/max3/sum/ws_main) rolled forward into this task at orchestrator's pragmatic call — prelude shift forces the snapshots immediately. Task 4 — Fixture migration: 58 .ail fixtures rewritten (`(app == …)` → `(app eq …)`, etc.; Float-typed operand sites to `(app float_eq …)` / `(app float_lt …)`). eq_ord_user_adt.ail:21 inner `==` → `eq` migration with lockstep eq_ord_e2e.rs:134 body-hash re-pin (3c4cf040cb4e8bb2 → new). Two prose snapshots accepted; deps test + 5 hash_pin literals updated as cascading consequences. Task 5 — Test-scaffold migration: all 8 in-source `#[cfg(test)] mod tests` AST-literal sites threaded (desugar.rs:2414, check/lib.rs:5656/6092/6220, codegen/lib.rs sites). 7 obsolete in-source tests deleted (5 eq_typechecks + 2 lower_eq ADT/Fn rejection — coverage moves to E2E eq_user_adt_smoke + eq_float_must_fail). 2 additional letrec tests deleted (single-module check env can't resolve eq/ge without prelude auto-import; covered by workspace E2E). Task 6 — Lit-pattern desugar: build_eq emits `Term::Var { name: "eq" }` instead of `"=="` at desugar.rs:1109; doc-comment rewritten to describe class-dispatch. Task 7 — Dead-machinery deletion sweep (compile-gated): typchecker builtins (install + list comparator entries deleted); codegen builtin_binop_typed (10 comparator arms deleted from synth.rs, table reduced to arithmetic core); lower_eq fn entirely deleted; `==` short-circuit in lower_app deleted; `is_static_callee` `==` clause deleted; `is_arithmetic_or_comparison_op` renamed to `is_arithmetic_op` + caller-update at codegen/lib.rs:2152 + :2529. Dead `poly_a_a_to_bool` helpers also removed. Workspace build green after compile gate — every caller of the deleted surface was migrated by Tasks 4-6. Task 8 — Float-aware NoInstance diagnostic: check/lib.rs:856-880 addendum extended to name `float_eq` / `float_lt` as the explicit alternative for Eq/Ord at Float; eq_float_noinstance.rs:32-44 assertion extended. Task 9 — IR snapshot regen: subsumed by Task 3 (prelude shift forced immediate snapshot regen; deferring to Task 9 would have left the workspace red between tasks). Task 10 — Prose-projection cleanup: 6 comparator arms deleted from binop_info; 3 in-source mod-tests updated/deleted (comparator-infix rendering would be dishonest now that the operators are no longer language identifiers). Task 11 — Contract updates: 5 design files rewritten to the class-dispatch present — float-semantics.md (arithmetic guarantees retained on +/-/*/; comparison guarantees transferred from ==/!=/< to float_eq/float_ne/float_lt/etc.); prelude-classes.md (Eq Unit added to instance list; new paragraph on six float_* fns; Float-no-Eq/Ord clause gains `→ use float_eq` cross-reference); str-abi.md (clause "REMAIN primitive operators" rewritten to describe class-method dispatch); scope-boundaries.md (multiple operator-name and Pattern::Lit-desugar clauses rewritten); authoring-surface.md (==, <= dropped from operator-example list). Task 12 — Initial acceptance gate: workspace 638/0 GREEN; bench/compile_check + cross_lang 0 regressed; bench/check.py flagged 4 regressions on bench_closure_chain (+29% bump_s, +47% rc_s, +29% bump_rss_kb, +48% rc_rss_kb). Orchestrator initially classified as DONE-with-concerns; Boss reclassified as PARTIAL-via-acceptance-#8-fail after independent re-run, extended iter scope to Task 13. Task 13 — Direct icmp intercept arms (Boss-extension): try_emit_primitive_instance_body gains direct-icmp arms for lt__Int / le__Int / gt__Int / ge__Int / ne__Int, bypassing the compare__Int → Ordering → match indirection that allocated one Ordering ctor per call in tight loops. Each new arm inherits `alwaysinline` via the existing allowlist (extended accordingly). New IR pin test `ord_int_intercept_ir_pin.rs` + smoke fixture `ord_int_intercept_smoke.ail` ratify the optimization — opt -O2 -S confirms zero `call @ail_prelude_lt__Int` in optimized IR; the icmp folds directly at every use site. Bool variants (lt__Bool/etc.) deliberately NOT added — no bench/example calls Ord at Bool; spec-extension permits skipping if unreachable at bench level. Family can be extended symmetrically when first Bool-ordered perf workload appears. Bench-gate post-Task-13: bench_closure_chain bump_s -6.05%, rc_s -2.67%, bump_rss_kb -0.77%, rc_rss_kb +0.46% — all four previously-regressed metrics back inside tolerance. Full bench corpus: 36 metrics, 0 regressed, 0 improved beyond tolerance, 36 stable. bench/check.py exit 0 ✓; bench/compile_check.py exit 0 ✓; bench/cross_lang.py exit 0 ✓. Workspace: 640 passed, 0 failed across all binaries (delta vs. milestone start: +5 new E2E/pin tests added in Task 1 + 1 IR pin added in Task 13 − 9 in-source mod tests deleted as obsolete net ≈ −3). The eq_user_adt_smoke fixture's Unit-opening line was the deliberate RED-first device added in planner self-review so the north-star wouldn't accidentally GREEN at start (user-ADT-Eq on Point with hand-written instance was already operable today; the milestone's actual delivery is operator-name death + Eq Unit + Float-named-fns + cleanup of the two-pathy primitive comparator machinery). Net delta: 96 files changed, 1760 insertions, 1101 deletions; 12 net-new files (6 new fixtures, 5 new E2E/pin tests, 1 stats file). main passes-test-count: 640 (was 633 pre-iter, accounting for the deletions). Spec-vs-acceptance addendum: spec §Testing strategy anticipated the bench-gate-regression case with two recovery paths (`alwaysinline` investigation or "spec needs revisiting toward α"). Task 13 is the third path — direct intercept arms for `lt`/etc. that bypass the compare→match path entirely. The spec's contingency clause was thus generous enough to absorb Task 13 without spec revision, but a future iter that hits a class-method primitive where the body shape introduces a similar codegen cost (Ordering allocation, RC tax, deferred-init) should expect a parallel extension. The pattern is "primitive instance whose canonical body indirects through other class methods that allocate" → add a direct-emit intercept arm + alwaysinline + IR-shape pin. Concerns absorbed: - Codegen lower_app / resolve_top_level_fn gained a prelude-fallback lookup so bare monomorphic prelude fns (`float_eq` etc.) resolve from non-prelude modules without explicit `prelude.float_eq` qualifier. Mirrors the typechecker's implicit prelude import — not in plan but necessary infra for the named-fn surface to be callable. - Recon's "≈10 fixtures" estimate was 6× too low — 58 actual. Mechanical migration; no design impact. - Recon caught 4 in-source AST-literal sites the spec missed (lib.rs:5656 `>=` site + three codegen/lib.rs sites); Task 5 covered all. - Recon caught 2 contract files outside the spec's update set that directly contradicted the milestone (str-abi.md + scope-boundaries.md "REMAIN primitive operators" / "Pattern::Lit desugar to ==" clauses); Task 11 covered all 5. Stats file: `bench/orchestrator-stats/2026-05-21-iter-operator-routing-eq-ord.1.json`. closes #1
This commit is contained in:
@@ -79,20 +79,9 @@ pub(crate) fn builtin_ail_type(name: &str) -> Option<Type> {
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ret_mode: ParamMode::Implicit,
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}),
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};
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let poly_a_a_to_bool = || Type::Forall {
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vars: vec!["a".into()],
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constraints: vec![],
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body: Box::new(Type::Fn {
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params: vec![
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Type::Var { name: "a".into() },
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Type::Var { name: "a".into() },
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],
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ret: Box::new(Type::bool_()),
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effects: vec![],
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param_modes: vec![],
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ret_mode: ParamMode::Implicit,
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}),
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};
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// 2026-05-21 operator-routing-eq-ord: `poly_a_a_to_bool` was
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// shared by the six comparator builtins. With those names
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// deleted from the surface, the helper is dead.
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let int_int_int = || Type::Fn {
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params: vec![Type::int(), Type::int()],
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ret: Box::new(Type::int()),
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@@ -103,26 +92,13 @@ pub(crate) fn builtin_ail_type(name: &str) -> Option<Type> {
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Some(match name {
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"+" | "-" | "*" | "/" => poly_a_a_to_a(),
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"%" => int_int_int(),
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"!=" | "<" | "<=" | ">" | ">=" => poly_a_a_to_bool(),
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// `==` is polymorphic — `forall a. (a, a) -> Bool`.
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// The mono pipeline asks `synth_arg_type` for the actual arg
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// types at the call site; `lower_app` then dispatches to the
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// right LLVM instruction (icmp eq i64 / i1, @strcmp, or
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// constant i1 1) on those resolved types.
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"==" => Type::Forall {
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vars: vec!["a".into()],
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constraints: vec![],
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body: Box::new(Type::Fn {
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params: vec![
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Type::Var { name: "a".into() },
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Type::Var { name: "a".into() },
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],
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ret: Box::new(Type::bool_()),
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effects: vec![],
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param_modes: vec![],
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ret_mode: ParamMode::Implicit,
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}),
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},
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// 2026-05-21 operator-routing-eq-ord: the six comparator
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// names (`==` / `!=` / `<` / `<=` / `>` / `>=`) are no
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// longer surface identifiers. Equality / ordering route
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// through the class methods `eq` / `compare` (prelude.Eq /
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// Ord); Float comparison routes through the named fns
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// `float_eq` / `float_lt` / etc. Neither path needs an
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// entry in this codegen-side mirror table.
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"not" => Type::Fn {
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params: vec![Type::bool_()],
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ret: Box::new(Type::bool_()),
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@@ -237,10 +213,14 @@ pub(crate) fn builtin_effect_op_ret(op: &str) -> Option<Type> {
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/// longer has to second-guess which arm fired.
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///
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/// Comparison-op Int arms are kept here in iter 4.2 to preserve
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/// the no-regression invariant — pre-iter-4 codegen routed
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/// `<`/`<=`/`>`/`>=`/`!=` through the same Int-only `builtin_binop`
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/// table. Iter 4.3 adds the Float arms (`("fcmp olt", "double", "i1")`
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/// and friends).
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/// `builtin_binop_typed` is now arithmetic-only. Comparators
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/// (`==` / `!=` / `<` / `<=` / `>` / `>=`) were removed in iter
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/// operator-routing-eq-ord.1 — surface comparison routes through
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/// the prelude.Eq / Ord class-method dispatch, with primitive
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/// instance bodies emitted via `try_emit_primitive_instance_body`
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/// in lib.rs (Eq Int / Bool / Str / Unit → `icmp`; Ord Int / Bool
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/// / Str → `icmp` + Ordering ctor; float_eq / float_ne / float_lt
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/// / float_le / float_gt / float_ge → `fcmp`).
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pub(crate) fn builtin_binop_typed(
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name: &str,
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arg_ty: &Type,
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@@ -257,23 +237,6 @@ pub(crate) fn builtin_binop_typed(
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("/", true, _) => Some(("sdiv", "i64", "i64")),
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("/", _, true) => Some(("fdiv", "double", "double")),
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("%", true, _) => Some(("srem", "i64", "i64")),
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// Comparison ops: operand types differ, result is always `i1`.
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// Int-arm comparisons preserved from pre-iter-4 `builtin_binop`;
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// Float arms land in iter 4.3.
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("!=", true, _) => Some(("icmp ne", "i64", "i1")),
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("<", true, _) => Some(("icmp slt", "i64", "i1")),
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("<=", true, _) => Some(("icmp sle", "i64", "i1")),
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(">", true, _) => Some(("icmp sgt", "i64", "i1")),
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(">=", true, _) => Some(("icmp sge", "i64", "i1")),
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// Float comparison arms (Floats iter 4.3). Note: `!=` Float
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// uses `fcmp une` ("unordered or not equal") — NOT `one`
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// ("ordered and not equal"), which would return `false` for
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// `nan != nan` and violate IEEE / spec A5.
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("!=", _, true) => Some(("fcmp une", "double", "i1")),
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("<", _, true) => Some(("fcmp olt", "double", "i1")),
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("<=", _, true) => Some(("fcmp ole", "double", "i1")),
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(">", _, true) => Some(("fcmp ogt", "double", "i1")),
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(">=", _, true) => Some(("fcmp oge", "double", "i1")),
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_ => None,
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}
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}
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