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iter operator-routing-eq-ord.1 (DONE 13/13): drop comparator builtins, route through Eq/Ord

Browse Source 
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:
Brummel
2026-05-21 01:16:21 +02:00
parent 400ad7c067
commit 5170b6abd1
96 changed files with 1759 additions and 1100 deletions
Download Patch File Download Diff File Expand all files Collapse all files
crates/ailang-codegen/src/lib.rs
+417 -390
View File
@@ -57,18 +57,17 @@ use synth::{
fn_sig_from_type, ll_string_literal, llvm_type,
};
/// Floats iter 4.2 fixup: classify a builtin name as a polymorphic
/// arithmetic or comparison op (the set `+`, `-`, `*`, `/`, `%`,
/// `!=`, `<`, `<=`, `>`, `>=`). `==` is NOT in this set — it goes
/// through `lower_eq` separately. Used by `lower_app` to decide
/// whether to call `builtin_binop_typed`, and by `is_static_callee`
/// (in combination with `==` and `not`) to recognise built-in
/// callees during the global-resolution pass.
fn is_arithmetic_or_comparison_op(name: &str) -> bool {
matches!(
name,
"+" | "-" | "*" | "/" | "%" | "!=" | "<" | "<=" | ">" | ">="
)
/// Classifies a builtin name as a polymorphic arithmetic op (the
/// set `+`, `-`, `*`, `/`, `%`). After iter operator-routing-eq-ord.1
/// the comparator names `==` / `!=` / `<` / `<=` / `>` / `>=` are
/// no longer surface-level identifiers (comparison goes through the
/// `eq` / `compare` class methods and the `float_*` named fns), so
/// only the five arithmetic ops live here. Used by `lower_app` to
/// decide whether to call `builtin_binop_typed`, and by
/// `is_static_callee` (in combination with `not`) to recognise
/// built-in callees during the global-resolution pass.
fn is_arithmetic_op(name: &str) -> bool {
matches!(name, "+" | "-" | "*" | "/" | "%")
}
/// Failure modes of [`emit_ir`] / [`lower_workspace`].
@@ -1150,6 +1149,51 @@ impl<'a> Emitter<'a> {
Ok(())
}
/// Returns `true` when the codegen should emit the LLVM
/// `alwaysinline` attribute on this fn's `define` line. The
/// allowlist is the set of primitive-instance bodies emitted by
/// `try_emit_primitive_instance_body` whose IR is so trivial
/// (one `icmp` / `fcmp` / `call` plus a `ret`) that `-O0` build
/// paths pay an unacceptable per-call overhead without inlining,
/// while `-O2` would inline these unconditionally anyway. The
/// list mirrors the intercept arm set in
/// `try_emit_primitive_instance_body` for the equality /
/// ordering / Float-comparison primitives. Checked against the
/// unmangled fn name; these symbols only live in the prelude
/// module so cross-module collisions are not a concern.
fn intercept_emit_wants_alwaysinline(symbol: &str) -> bool {
if matches!(
symbol,
"eq__Int" | "eq__Bool" | "eq__Str" | "eq__Unit"
| "compare__Int" | "compare__Bool" | "compare__Str"
| "float_eq" | "float_ne"
| "float_lt" | "float_le"
| "float_gt" | "float_ge"
) {
return true;
}
// The polymorphic free helpers `ne` / `lt` / `le` / `gt` /
// `ge` mono into per-type bodies. At `_Int` (iter
// operator-routing-eq-ord.1 Task 13) they are intercepted as
// single direct `icmp` instructions in
// `try_emit_primitive_instance_body` — same shape as
// `eq__Int`, ie. one `icmp` + one `ret`. At other types
// (`_Bool`, `_Str`, user ADTs) they keep their polymorphic
// body — a one-arm-deep `match (compare x y) (case LT ... )
// (case _ ... )` — which still folds at `-O2` provided the
// mono symbol carries `alwaysinline`. Both shapes benefit
// from the attribute; the stem-prefix match covers all T the
// mono pass produces uniformly so the bench-perf parity with
// the pre-milestone arithmetic-comparator emission is
// preserved end-to-end.
if let Some(stem) = symbol.split("__").next() {
if matches!(stem, "ne" | "lt" | "le" | "gt" | "ge") {
return true;
}
}
false
}
fn emit_fn(&mut self, f: &FnDef) -> Result<()> {
// also lift `param_modes` out of the fn type. The
// fn-return Own-param dec emission below consults it to decide
@@ -1241,7 +1285,17 @@ impl<'a> Emitter<'a> {
self.ssa_fn_sigs.insert(pssa, fs);
}
}
sig.push_str(") {\n");
if Self::intercept_emit_wants_alwaysinline(&f.name) {
// Append the `alwaysinline` attribute between the close-paren
// of the parameter list and the `{` opening the body. Symbols
// matched here are emitted by `try_emit_primitive_instance_body`;
// forcing inlining keeps the single `icmp` / `fcmp` body folded
// at every use site under `-O0` (matching the IR shape the
// deleted `lower_eq` direct-emit path produced).
sig.push_str(") alwaysinline {\n");
} else {
sig.push_str(") {\n");
}
self.body.push_str(&sig);
self.start_block("entry");
@@ -2124,32 +2178,19 @@ impl<'a> Emitter<'a> {
}
fn lower_app(&mut self, name: &str, args: &[Term], tail: bool) -> Result<(String, String)> {
// `==` is polymorphic (`forall a. (a, a) -> Bool`).
// Dispatch on the resolved AIL arg type — the LLVM `ptr` shape
// aliases multiple AIL types (Str vs ADT vs Fn), so we cannot
// dispatch on the LLVM type alone. ADT/Fn equality is rejected
// here with a clear error; `Unit` evaluates both sides for
// their side effects then returns constant `i1 1`.
if name == "==" {
if args.len() != 2 {
return Err(CodegenError::Internal(
"builtin `==` expected 2 args".into(),
));
}
let arg_ty = self.synth_arg_type(&args[0])?;
let (a, a_ll) = self.lower_term(&args[0])?;
let (b, _b_ll) = self.lower_term(&args[1])?;
let _ = tail;
return self.lower_eq(&arg_ty, &a, &b, &a_ll);
}
// 2026-05-21 operator-routing-eq-ord: the `if name == "=="`
// short-circuit that routed through `lower_eq` is gone. `==`
// is no longer a surface identifier; the typechecker
// intercepts `(app == …)` as `unknown variable` long before
// codegen. Equality dispatch lives in
// `try_emit_primitive_instance_body` for the primitive Eq
// instance bodies (Int/Bool/Str/Unit), called via the
// class-method `eq` from prelude.Eq.
// Floats iter 4.2: arithmetic / comparison are now polymorphic
// over `{Int, Float}`. Resolve the arg type, then dispatch via
// `builtin_binop_typed`. Same shape as the `==` dispatch above.
// Comparison ops are matched here in iter 4.2 with Int-only
// dispatch (preserving pre-iter-4 behaviour) so the workspace
// stays green; iter 4.3 adds the Float comparison arms.
if is_arithmetic_or_comparison_op(name) {
// Arithmetic ops `+`/`-`/`*`/`/`/`%` are still polymorphic
// over `{Int, Float}`. Resolve the arg type, then dispatch
// via `builtin_binop_typed`.
if is_arithmetic_op(name) {
if args.len() != 2 {
return Err(CodegenError::Internal(format!(
"builtin `{name}` expected 2 args"
@@ -2389,6 +2430,21 @@ impl<'a> Emitter<'a> {
return self.emit_call(self.module_name, name, &sig, args, tail);
}
// operator-routing-eq-ord.1: prelude fallback for monomorphic
// prelude fns called bare from a non-prelude module (e.g.
// `(app float_eq …)`). Mirrors the fallback already in
// `is_static_callee` and `resolve_top_level_fn`.
if self.module_name != "prelude" {
if let Some(sig) = self
.module_user_fns
.get("prelude")
.and_then(|m| m.get(name))
.cloned()
{
return self.emit_call("prelude", name, &sig, args, tail);
}
}
Err(CodegenError::Internal(format!(
"unknown callee: `{name}`"
)))
@@ -2526,7 +2582,7 @@ impl<'a> Emitter<'a> {
/// `prefix.def`. Locals shadow this — the caller checks for
/// that first.
fn is_static_callee(&self, name: &str) -> bool {
if is_arithmetic_or_comparison_op(name) || name == "==" || name == "not" {
if is_arithmetic_op(name) || name == "not" {
return true;
}
// Floats iter 4.4: new fn-builtins (`neg`, `int_to_float`,
@@ -2554,9 +2610,35 @@ impl<'a> Emitter<'a> {
// iter 23.4: poly-def arm dropped — post-mono there are no
// `Type::Forall` defs in `module_user_fns` to begin with, and
// `module_polymorphic_fns` no longer exists.
self.module_user_fns
if self
.module_user_fns
.get(self.module_name)
.is_some_and(|m| m.contains_key(name))
{
return true;
}
// operator-routing-eq-ord.1: the typechecker auto-imports
// prelude into every non-prelude module so a bare reference
// like `(app float_eq …)` typechecks against the prelude's
// monomorphic `float_eq` fn. The codegen needs the matching
// resolution: if the name is not in the current module but
// IS in prelude's monomorphic fn table, treat it as a static
// callee — the call lowers to `@ail_prelude_<name>` directly.
// Without this fallback, post-mono polymorphic-prelude calls
// (e.g. `print`) work because the mono pass synthesises a
// mono arm `print__T` into the user's module, but monomorphic
// prelude fns (no Forall to instantiate) never get a mirror
// arm in user modules and would otherwise fail at codegen
// with `unknown variable`.
if self.module_name != "prelude"
&& self
.module_user_fns
.get("prelude")
.is_some_and(|m| m.contains_key(name))
{
return true;
}
false
}
/// resolve `name` to a top-level fn-value, i.e. the address
@@ -2587,15 +2669,32 @@ impl<'a> Emitter<'a> {
let sig = self.module_user_fns.get(target)?.get(suffix)?.clone();
return Some((format!("@ail_{target}_{suffix}_clos"), sig));
}
let sig = self
if let Some(sig) = self
.module_user_fns
.get(self.module_name)?
.get(name)?
.clone();
Some((
format!("@ail_{module}_{name}_clos", module = self.module_name),
sig,
))
.get(self.module_name)
.and_then(|m| m.get(name))
.cloned()
{
return Some((
format!("@ail_{module}_{name}_clos", module = self.module_name),
sig,
));
}
// operator-routing-eq-ord.1: fall back to prelude (mirrors
// the auto-import the typechecker performs for non-prelude
// modules). Needed for monomorphic prelude fns (e.g. `float_eq`)
// which have no mono mirror in the user's module.
if self.module_name != "prelude" {
if let Some(sig) = self
.module_user_fns
.get("prelude")
.and_then(|m| m.get(name))
.cloned()
{
return Some((format!("@ail_prelude_{name}_clos"), sig));
}
}
None
}
/// resolve a `Term::Var` reference to a const def. Returns
@@ -2794,10 +2893,241 @@ impl<'a> Emitter<'a> {
)?;
Ok(true)
}
"eq__Int" => {
if param_tys != ["i64", "i64"] || ret_ty != "i1" {
return Err(CodegenError::Internal(format!(
"eq__Int body intercept: unexpected signature \
({param_tys:?}) -> {ret_ty} (want (i64, i64) -> i1)"
)));
}
let n = self.locals.len();
let a_ssa = self.locals[n - 2].1.clone();
let b_ssa = self.locals[n - 1].1.clone();
let r = self.fresh_ssa();
self.body.push_str(&format!(
" {r} = icmp eq i64 {a_ssa}, {b_ssa}\n"
));
self.body.push_str(&format!(" ret i1 {r}\n"));
self.body.push_str("}\n\n");
self.block_terminated = true;
Ok(true)
}
"eq__Bool" => {
if param_tys != ["i1", "i1"] || ret_ty != "i1" {
return Err(CodegenError::Internal(format!(
"eq__Bool body intercept: unexpected signature \
({param_tys:?}) -> {ret_ty} (want (i1, i1) -> i1)"
)));
}
let n = self.locals.len();
let a_ssa = self.locals[n - 2].1.clone();
let b_ssa = self.locals[n - 1].1.clone();
let r = self.fresh_ssa();
self.body.push_str(&format!(
" {r} = icmp eq i1 {a_ssa}, {b_ssa}\n"
));
self.body.push_str(&format!(" ret i1 {r}\n"));
self.body.push_str("}\n\n");
self.block_terminated = true;
Ok(true)
}
"eq__Unit" => {
// Unit is single-inhabitant: all values compare equal.
// The fn signature still carries the operand slots; we
// discard them and return true unconditionally.
if ret_ty != "i1" {
return Err(CodegenError::Internal(format!(
"eq__Unit body intercept: unexpected return type \
({param_tys:?}) -> {ret_ty} (want -> i1)"
)));
}
self.body.push_str(" ret i1 1\n");
self.body.push_str("}\n\n");
self.block_terminated = true;
Ok(true)
}
"float_eq" => {
if param_tys != ["double", "double"] || ret_ty != "i1" {
return Err(CodegenError::Internal(format!(
"float_eq body intercept: unexpected signature \
({param_tys:?}) -> {ret_ty} (want (double, double) -> i1)"
)));
}
let n = self.locals.len();
let a_ssa = self.locals[n - 2].1.clone();
let b_ssa = self.locals[n - 1].1.clone();
let r = self.fresh_ssa();
self.body.push_str(&format!(
" {r} = fcmp oeq double {a_ssa}, {b_ssa}\n"
));
self.body.push_str(&format!(" ret i1 {r}\n"));
self.body.push_str("}\n\n");
self.block_terminated = true;
Ok(true)
}
"float_ne" => {
// `fcmp une` ("unordered or not-equal"), not `one`,
// mirroring float-semantics.md: NaN != NaN must be true.
if param_tys != ["double", "double"] || ret_ty != "i1" {
return Err(CodegenError::Internal(format!(
"float_ne body intercept: unexpected signature \
({param_tys:?}) -> {ret_ty} (want (double, double) -> i1)"
)));
}
let n = self.locals.len();
let a_ssa = self.locals[n - 2].1.clone();
let b_ssa = self.locals[n - 1].1.clone();
let r = self.fresh_ssa();
self.body.push_str(&format!(
" {r} = fcmp une double {a_ssa}, {b_ssa}\n"
));
self.body.push_str(&format!(" ret i1 {r}\n"));
self.body.push_str("}\n\n");
self.block_terminated = true;
Ok(true)
}
"float_lt" => {
if param_tys != ["double", "double"] || ret_ty != "i1" {
return Err(CodegenError::Internal(format!(
"float_lt body intercept: unexpected signature \
({param_tys:?}) -> {ret_ty} (want (double, double) -> i1)"
)));
}
let n = self.locals.len();
let a_ssa = self.locals[n - 2].1.clone();
let b_ssa = self.locals[n - 1].1.clone();
let r = self.fresh_ssa();
self.body.push_str(&format!(
" {r} = fcmp olt double {a_ssa}, {b_ssa}\n"
));
self.body.push_str(&format!(" ret i1 {r}\n"));
self.body.push_str("}\n\n");
self.block_terminated = true;
Ok(true)
}
"float_le" => {
if param_tys != ["double", "double"] || ret_ty != "i1" {
return Err(CodegenError::Internal(format!(
"float_le body intercept: unexpected signature \
({param_tys:?}) -> {ret_ty} (want (double, double) -> i1)"
)));
}
let n = self.locals.len();
let a_ssa = self.locals[n - 2].1.clone();
let b_ssa = self.locals[n - 1].1.clone();
let r = self.fresh_ssa();
self.body.push_str(&format!(
" {r} = fcmp ole double {a_ssa}, {b_ssa}\n"
));
self.body.push_str(&format!(" ret i1 {r}\n"));
self.body.push_str("}\n\n");
self.block_terminated = true;
Ok(true)
}
"float_gt" => {
if param_tys != ["double", "double"] || ret_ty != "i1" {
return Err(CodegenError::Internal(format!(
"float_gt body intercept: unexpected signature \
({param_tys:?}) -> {ret_ty} (want (double, double) -> i1)"
)));
}
let n = self.locals.len();
let a_ssa = self.locals[n - 2].1.clone();
let b_ssa = self.locals[n - 1].1.clone();
let r = self.fresh_ssa();
self.body.push_str(&format!(
" {r} = fcmp ogt double {a_ssa}, {b_ssa}\n"
));
self.body.push_str(&format!(" ret i1 {r}\n"));
self.body.push_str("}\n\n");
self.block_terminated = true;
Ok(true)
}
"float_ge" => {
if param_tys != ["double", "double"] || ret_ty != "i1" {
return Err(CodegenError::Internal(format!(
"float_ge body intercept: unexpected signature \
({param_tys:?}) -> {ret_ty} (want (double, double) -> i1)"
)));
}
let n = self.locals.len();
let a_ssa = self.locals[n - 2].1.clone();
let b_ssa = self.locals[n - 1].1.clone();
let r = self.fresh_ssa();
self.body.push_str(&format!(
" {r} = fcmp oge double {a_ssa}, {b_ssa}\n"
));
self.body.push_str(&format!(" ret i1 {r}\n"));
self.body.push_str("}\n\n");
self.block_terminated = true;
Ok(true)
}
// Ord/Eq Int direct-icmp arms (iter operator-routing-eq-ord.1
// Task 13). The polymorphic prelude bodies are
// `(match (app compare x y) ...)`; without these intercept
// arms, each `lt`-at-Int call site goes through
// `compare__Int` → allocate an `Ordering` ctor → match.
// At `-O2` even with `alwaysinline` on the helpers, clang
// does not always collapse the Ordering allocation across
// the helper boundary (observed: +29% bump_s, +47% rc_s
// bench_closure_chain regression before this arm shipped).
// Direct `icmp slt i64` at the helper body lets clang fold
// the comparison to the use site reliably.
//
// `ne__Int` uses `icmp ne i64` directly, NOT the
// `not (eq x y)` indirection — that would re-introduce one
// call boundary and one `xor i1 %r, true` per comparison
// that contributes no semantic value beyond the direct
// `icmp ne`.
//
// Bool variants (`lt__Bool`, `le__Bool`, etc.) are not
// emitted as intercept arms here because no current
// bench fixture or example reaches them; the polymorphic
// body via `compare__Bool` remains correct, just slightly
// slower per call. The next fixture that needs Bool-ordered
// perf can extend this family symmetrically.
"lt__Int" => self.emit_direct_int_icmp_intercept("lt__Int", "icmp slt i64", param_tys, ret_ty),
"le__Int" => self.emit_direct_int_icmp_intercept("le__Int", "icmp sle i64", param_tys, ret_ty),
"gt__Int" => self.emit_direct_int_icmp_intercept("gt__Int", "icmp sgt i64", param_tys, ret_ty),
"ge__Int" => self.emit_direct_int_icmp_intercept("ge__Int", "icmp sge i64", param_tys, ret_ty),
"ne__Int" => self.emit_direct_int_icmp_intercept("ne__Int", "icmp ne i64", param_tys, ret_ty),
_ => Ok(false),
}
}
/// Emit a direct `<icmp_op> i64` body for the `lt__Int` /
/// `le__Int` / `gt__Int` / `ge__Int` / `ne__Int` intercept arms.
/// All five share the same shape: pull the two operand SSAs from
/// `self.locals` (populated by `emit_fn` before dispatch), emit
/// `%r = <icmp_op> %a, %b` and `ret i1 %r`, close the body.
/// `icmp_op` is the full instruction-and-operand-type prefix
/// (e.g. `"icmp slt i64"`); the operand SSAs are appended.
fn emit_direct_int_icmp_intercept(
&mut self,
fn_name: &str,
icmp_op: &str,
param_tys: &[String],
ret_ty: &str,
) -> Result<bool> {
if param_tys != ["i64", "i64"] || ret_ty != "i1" {
return Err(CodegenError::Internal(format!(
"{fn_name} body intercept: unexpected signature \
({param_tys:?}) -> {ret_ty} (want (i64, i64) -> i1)"
)));
}
let n = self.locals.len();
let a_ssa = self.locals[n - 2].1.clone();
let b_ssa = self.locals[n - 1].1.clone();
let r = self.fresh_ssa();
self.body.push_str(&format!(
" {r} = {icmp_op} {a_ssa}, {b_ssa}\n"
));
self.body.push_str(&format!(" ret i1 {r}\n"));
self.body.push_str("}\n\n");
self.block_terminated = true;
Ok(true)
}
/// emit one arm of the `compare__T` branch ladder.
/// Starts a fresh basic block labelled `label`, constructs the
/// matching `Ordering` ctor (LT / EQ / GT) via `lower_ctor`, and
@@ -2869,99 +3199,16 @@ impl<'a> Emitter<'a> {
Ok(())
}
/// lower a `==` call after the two operands have been
/// emitted. Dispatches on the resolved AIL type of the arg side
/// (both sides have the same type after typecheck). The `_a_ll`
/// hint is the LLVM type the lowering produced for `a`; we use
/// it as a sanity check against `arg_ty`'s expected LLVM shape.
///
/// Supported:
/// - `Int` → `icmp eq i64`
/// - `Bool` → `icmp eq i1`
/// - `Str` → `@strcmp` then `icmp eq i32 0`
/// - `Unit` → constant `i1 true` (both sides already evaluated
/// for any side effects; Unit has a single inhabitant).
///
/// Rejected with `CodegenError::Internal` for ADT, `Fn`, and any
/// other type — those would need either a structural-equality
/// scheme (ADT) or a fn-pointer compare (Fn) that the language
/// does not yet specify.
fn lower_eq(
&mut self,
arg_ty: &Type,
a: &str,
b: &str,
_a_ll: &str,
) -> Result<(String, String)> {
match arg_ty {
Type::Con { name, .. } => match name.as_str() {
"Int" => {
let dst = self.fresh_ssa();
self.body.push_str(&format!(
" {dst} = icmp eq i64 {a}, {b}\n"
));
Ok((dst, "i1".into()))
}
"Bool" => {
let dst = self.fresh_ssa();
self.body.push_str(&format!(
" {dst} = icmp eq i1 {a}, {b}\n"
));
Ok((dst, "i1".into()))
}
"Str" => {
// IR-Str pointers now land on the
// `len`-field of the packed-struct slab; @strcmp
// needs the bytes pointer 8 bytes further on.
// Parallel to the `eq__Str` and `compare__Str`
// intercepts in `try_emit_primitive_instance_body`.
let a_bytes = self.fresh_ssa();
let b_bytes = self.fresh_ssa();
self.body.push_str(&format!(
" {a_bytes} = getelementptr inbounds i8, ptr {a}, i64 8\n"
));
self.body.push_str(&format!(
" {b_bytes} = getelementptr inbounds i8, ptr {b}, i64 8\n"
));
let cmp = self.fresh_ssa();
self.body.push_str(&format!(
" {cmp} = call i32 @strcmp(ptr {a_bytes}, ptr {b_bytes})\n"
));
let dst = self.fresh_ssa();
self.body.push_str(&format!(
" {dst} = icmp eq i32 {cmp}, 0\n"
));
Ok((dst, "i1".into()))
}
"Unit" => {
// Both sides have already been evaluated above for
// any side effects; Unit has a single inhabitant,
// so equality is `true` by definition.
let _ = a;
let _ = b;
Ok(("true".into(), "i1".into()))
}
"Float" => {
let dst = self.fresh_ssa();
self.body.push_str(&format!(
" {dst} = fcmp oeq double {a}, {b}\n"
));
Ok((dst, "i1".into()))
}
other => Err(CodegenError::Internal(format!(
"`==` not supported for type `{other}` \
(ADT and user-defined types lack a structural-equality scheme)"
))),
},
Type::Fn { .. } => Err(CodegenError::Internal(
"`==` not supported for function types (no canonical fn-pointer equality)".into(),
)),
other => Err(CodegenError::Internal(format!(
"`==` not supported for type `{}`",
ailang_core::pretty::type_to_string(other)
))),
}
}
// 2026-05-21 operator-routing-eq-ord: `lower_eq` is deleted.
// Equality is no longer a direct-emit codegen path; it flows
// through the class method `eq` (prelude.Eq) whose primitive
// instance bodies are emitted by
// `try_emit_primitive_instance_body` (Eq Int/Bool/Str/Unit
// arms, each lowering to a single `icmp` / call /
// constant-`i1`-`1` plus the alwaysinline attribute on the
// generated fn definition). The deleted fn handled Int / Bool /
// Str / Unit / Float branches plus the ADT/Fn rejection arms;
// none of those code paths are now reachable.
pub(crate) fn fresh_ssa(&mut self) -> String {
self.counter += 1;
@@ -3327,119 +3574,15 @@ mod tests {
);
}
/// codegen rejects `==` on ADT-typed args with a clear
/// error. The typechecker accepts the call (the rigid var of
/// `forall a. (a, a) -> Bool` unifies with the ADT type), so the
/// rejection has to happen here. The diagnostic must mention the
/// `==` symbol and the ADT type name.
#[test]
fn eq_on_adt_rejected_at_codegen() {
// Tiny ADT `data K = Mk` (nullary).
let mk = Term::Ctor {
type_name: "K".into(),
ctor: "Mk".into(),
args: vec![],
};
let m = Module {
schema: SCHEMA.into(),
name: "t".into(),
imports: vec![],
defs: vec![
Def::Type(TypeDef {
name: "K".into(),
vars: vec![],
ctors: vec![Ctor {
name: "Mk".into(),
fields: vec![],
}],
doc: None,
drop_iterative: false,
}),
Def::Fn(FnDef {
name: "main".into(),
ty: Type::Fn {
params: vec![],
ret: Box::new(Type::unit()),
effects: vec![],
param_modes: vec![],
ret_mode: ParamMode::Implicit,
},
params: vec![],
body: Term::Let {
name: "_b".into(),
value: Box::new(Term::App {
callee: Box::new(Term::Var { name: "==".into() }),
args: vec![mk.clone(), mk],
tail: false,
}),
body: Box::new(Term::Lit { lit: Literal::Unit }),
},
suppress: vec![],
doc: None,
export: None,
}),
],
};
let err = emit_ir(&m).expect_err(
"`==` on ADT must be rejected at codegen; emit_ir succeeded",
);
let msg = format!("{err:?}");
assert!(
msg.contains("==") && msg.contains("not supported"),
"expected error mentioning `==` not supported; got: {msg}"
);
}
/// same negative-path guard for function-typed args.
/// `==` on `Fn` is rejected with a "not supported for function
/// types" message.
#[test]
fn eq_on_fn_rejected_at_codegen() {
// `let f = main in (== f f)` — `main` is in scope as a fn-value.
let m = Module {
schema: SCHEMA.into(),
name: "t".into(),
imports: vec![],
defs: vec![Def::Fn(FnDef {
name: "main".into(),
ty: Type::Fn {
params: vec![],
ret: Box::new(Type::unit()),
effects: vec![],
param_modes: vec![],
ret_mode: ParamMode::Implicit,
},
params: vec![],
body: Term::Let {
name: "f".into(),
value: Box::new(Term::Var { name: "main".into() }),
body: Box::new(Term::Let {
name: "_b".into(),
value: Box::new(Term::App {
callee: Box::new(Term::Var { name: "==".into() }),
args: vec![
Term::Var { name: "f".into() },
Term::Var { name: "f".into() },
],
tail: false,
}),
body: Box::new(Term::Lit { lit: Literal::Unit }),
}),
},
suppress: vec![],
doc: None,
export: None,
})],
};
let err = emit_ir(&m).expect_err(
"`==` on Fn must be rejected at codegen; emit_ir succeeded",
);
let msg = format!("{err:?}");
assert!(
msg.contains("==") && msg.contains("function"),
"expected error mentioning `==` and function types; got: {msg}"
);
}
// 2026-05-21 operator-routing-eq-ord: the two
// `eq_on_adt_rejected_at_codegen` / `eq_on_fn_rejected_at_codegen`
// tests pinned the `lower_eq` direct-emit rejection path for ADT /
// Fn args. With `lower_eq` deleted in Task 7 and `==` no longer a
// builtin, the rejection path is gone by structure: `(app eq ADT
// ADT)` is rejected at typecheck as `NoInstance Eq <ADT>` (the
// user did not provide an instance), and `(app eq Fn Fn)` is
// similarly rejected. Coverage of the ADT no-instance case lives
// in `eq_ord_e2e.rs` (negative path on a missing user instance).
#[test]
fn missing_entry_main_is_error() {
@@ -3676,73 +3819,17 @@ mod tests {
);
}
/// Floats iter 4.3 RED: `(< 1.5 2.5)` lowers as `fcmp olt double`;
/// `(!= 1.5 1.5)` lowers as `fcmp UNE double` (NOT `one`); `(== 1.5
/// 1.5)` lowers as `fcmp oeq double`. Int regressions still emit
/// `icmp slt i64` / `icmp ne i64` / `icmp eq i64`.
#[test]
fn lowers_float_comparison_dispatched() {
use ailang_core::ast::*;
fn fn_def(name: &str, body: Term) -> Def {
Def::Fn(FnDef {
name: name.into(),
ty: Type::Fn {
params: vec![],
ret: Box::new(Type::bool_()),
effects: vec![],
param_modes: vec![],
ret_mode: ParamMode::Implicit,
},
params: vec![],
body,
suppress: vec![],
doc: None,
export: None,
})
}
fn cmp(op: &str, a: Term, b: Term) -> Term {
Term::App {
callee: Box::new(Term::Var { name: op.into() }),
args: vec![a, b],
tail: false,
}
}
let f1 = Term::Lit { lit: Literal::Float { bits: 0x3ff8_0000_0000_0000u64 } };
let f2 = Term::Lit { lit: Literal::Float { bits: 0x4004_0000_0000_0000u64 } };
let i1 = Term::Lit { lit: Literal::Int { value: 1 } };
let i2 = Term::Lit { lit: Literal::Int { value: 2 } };
let main_def = Def::Fn(FnDef {
name: "main".into(),
ty: Type::Fn {
params: vec![], ret: Box::new(Type::unit()), effects: vec![],
param_modes: vec![], ret_mode: ParamMode::Implicit,
},
params: vec![], body: Term::Lit { lit: Literal::Unit },
suppress: vec![], doc: None,
export: None,
});
let m = Module {
schema: ailang_core::SCHEMA.to_string(),
name: "t".into(),
imports: vec![],
defs: vec![
fn_def("flt_f", cmp("<", f1.clone(), f2.clone())),
fn_def("fne_f", cmp("!=", f1.clone(), f1.clone())),
fn_def("feq_f", cmp("==", f1.clone(), f1.clone())),
fn_def("flt_i", cmp("<", i1.clone(), i2.clone())),
fn_def("fne_i", cmp("!=", i1.clone(), i2.clone())),
fn_def("feq_i", cmp("==", i1.clone(), i2.clone())),
main_def,
],
};
let ir = emit_ir(&m).unwrap();
assert!(ir.contains("fcmp olt double"), "missing `fcmp olt double`: {ir}");
assert!(ir.contains("fcmp une double"), "missing `fcmp une double` (note: `une` not `one`): {ir}");
assert!(ir.contains("fcmp oeq double"), "missing `fcmp oeq double`: {ir}");
assert!(ir.contains("icmp slt i64"), "Int `<` regressed: {ir}");
assert!(ir.contains("icmp ne i64"), "Int `!=` regressed: {ir}");
assert!(ir.contains("icmp eq i64"), "Int `==` regressed: {ir}");
}
// 2026-05-21 operator-routing-eq-ord: the
// `lowers_float_comparison_dispatched` test pinned the direct-emit
// `builtin_binop_typed` comparator arms for `==`/`!=`/`<` over
// Int and Float. Those arms are deleted in Task 7 (comparison is
// now class-method dispatch for Int/Bool/Str via prelude.Eq/Ord
// and named-fn dispatch for Float via float_eq / float_lt / etc.);
// the test's premise is gone. Replacement coverage of the new
// IR shape lives in the intercept-arm machinery exercised by
// `prelude_eq_int_carries_alwaysinline_attribute_in_emitted_ir`
// (Eq Int → icmp eq + alwaysinline) and indirectly via the
// workspace e2e tests for the Float-named-fn surface.
/// Floats iter 4.4 RED: four new fn-builtins lower to the spec'd
/// LLVM ops. `neg` polymorphic dispatches to `sub i64 0, %x` for
@@ -4325,75 +4412,15 @@ mod tests {
);
}
/// the `==` operator on `Str` lowers via an inline
/// `@strcmp` call (separate from the `eq__Str` instance-method
/// intercept used by the dictionary path). Both operand pointers
/// must be `+8` GEP'd to land on the bytes pointer before
/// `@strcmp`, symmetric to the `eq__Str` and `compare__Str`
/// fixes. Without this, `==` on Str literals reads the 8-byte
/// `len`-field as bytes and never finds the NUL terminator
/// within the expected range, breaking string equality.
#[test]
fn lower_eq_str_calls_strcmp_with_bytes_pointer() {
let m = Module {
schema: SCHEMA.into(),
name: "t".into(),
imports: vec![],
defs: vec![
Def::Fn(FnDef {
name: "test".into(),
ty: Type::Fn {
params: vec![],
ret: Box::new(Type::bool_()),
effects: vec![],
param_modes: vec![],
ret_mode: ParamMode::Implicit,
},
params: vec![],
body: Term::App {
callee: Box::new(Term::Var { name: "==".into() }),
args: vec![
Term::Lit { lit: Literal::Str { value: "a".into() } },
Term::Lit { lit: Literal::Str { value: "b".into() } },
],
tail: false,
},
suppress: vec![],
doc: None,
export: None,
}),
Def::Fn(FnDef {
name: "main".into(),
ty: Type::Fn {
params: vec![],
ret: Box::new(Type::unit()),
effects: vec![],
param_modes: vec![],
ret_mode: ParamMode::Implicit,
},
params: vec![],
body: Term::Lit { lit: Literal::Unit },
suppress: vec![],
doc: None,
export: None,
}),
],
};
let ir = emit_ir(&m).unwrap();
let body_idx = ir.find("define i1 @ail_t_test").expect("test body");
let body = &ir[body_idx..];
let cmp_idx = body.find("@strcmp(").expect("@strcmp call present");
let before_cmp = &body[..cmp_idx];
let gep_count = before_cmp.matches("getelementptr inbounds i8, ptr ").count();
assert_eq!(
gep_count, 2,
"expected 2 +8 GEPs before @strcmp (one per operand); ir body was:\n{body}"
);
assert!(
before_cmp.matches(", i64 8").count() >= 2,
"expected both GEPs to be `, i64 8`; ir body was:\n{body}"
);
}
// 2026-05-21 operator-routing-eq-ord: the
// `lower_eq_str_calls_strcmp_with_bytes_pointer` test pinned the
// `lower_eq` direct-emit Str path that used an inline `@strcmp`
// call. With `lower_eq` deleted in Task 7 and `==` no longer a
// builtin, the only Str-equality path is class-method dispatch
// via prelude.Eq.eq, which the intercept lowers via the existing
// `eq__Str` arm (call to `@ail_str_eq`, not `@strcmp`). That
// path's GEP-+8 / bytes-pointer correctness is pinned by
// `eq_str_mono_symbol_emits_ail_str_eq_call` below.
/// a `Term::App` calling `int_to_str` lowers to
/// `call ptr @ailang_int_to_str(i64 %a)`. Pins the new builtin's
crates/ailang-codegen/src/synth.rs
+18 -55
View File
@@ -79,20 +79,9 @@ pub(crate) fn builtin_ail_type(name: &str) -> Option<Type> {
ret_mode: ParamMode::Implicit,
}),
};
let poly_a_a_to_bool = || Type::Forall {
vars: vec!["a".into()],
constraints: vec![],
body: Box::new(Type::Fn {
params: vec![
Type::Var { name: "a".into() },
Type::Var { name: "a".into() },
],
ret: Box::new(Type::bool_()),
effects: vec![],
param_modes: vec![],
ret_mode: ParamMode::Implicit,
}),
};
// 2026-05-21 operator-routing-eq-ord: `poly_a_a_to_bool` was
// shared by the six comparator builtins. With those names
// deleted from the surface, the helper is dead.
let int_int_int = || Type::Fn {
params: vec![Type::int(), Type::int()],
ret: Box::new(Type::int()),
@@ -103,26 +92,13 @@ pub(crate) fn builtin_ail_type(name: &str) -> Option<Type> {
Some(match name {
"+" | "-" | "*" | "/" => poly_a_a_to_a(),
"%" => int_int_int(),
"!=" | "<" | "<=" | ">" | ">=" => poly_a_a_to_bool(),
// `==` is polymorphic — `forall a. (a, a) -> Bool`.
// The mono pipeline asks `synth_arg_type` for the actual arg
// types at the call site; `lower_app` then dispatches to the
// right LLVM instruction (icmp eq i64 / i1, @strcmp, or
// constant i1 1) on those resolved types.
"==" => Type::Forall {
vars: vec!["a".into()],
constraints: vec![],
body: Box::new(Type::Fn {
params: vec![
Type::Var { name: "a".into() },
Type::Var { name: "a".into() },
],
ret: Box::new(Type::bool_()),
effects: vec![],
param_modes: vec![],
ret_mode: ParamMode::Implicit,
}),
},
// 2026-05-21 operator-routing-eq-ord: the six comparator
// names (`==` / `!=` / `<` / `<=` / `>` / `>=`) are no
// longer surface identifiers. Equality / ordering route
// through the class methods `eq` / `compare` (prelude.Eq /
// Ord); Float comparison routes through the named fns
// `float_eq` / `float_lt` / etc. Neither path needs an
// entry in this codegen-side mirror table.
"not" => Type::Fn {
params: vec![Type::bool_()],
ret: Box::new(Type::bool_()),
@@ -237,10 +213,14 @@ pub(crate) fn builtin_effect_op_ret(op: &str) -> Option<Type> {
/// longer has to second-guess which arm fired.
///
/// Comparison-op Int arms are kept here in iter 4.2 to preserve
/// the no-regression invariant — pre-iter-4 codegen routed
/// `<`/`<=`/`>`/`>=`/`!=` through the same Int-only `builtin_binop`
/// table. Iter 4.3 adds the Float arms (`("fcmp olt", "double", "i1")`
/// and friends).
/// `builtin_binop_typed` is now arithmetic-only. Comparators
/// (`==` / `!=` / `<` / `<=` / `>` / `>=`) were removed in iter
/// operator-routing-eq-ord.1 — surface comparison routes through
/// the prelude.Eq / Ord class-method dispatch, with primitive
/// instance bodies emitted via `try_emit_primitive_instance_body`
/// in lib.rs (Eq Int / Bool / Str / Unit → `icmp`; Ord Int / Bool
/// / Str → `icmp` + Ordering ctor; float_eq / float_ne / float_lt
/// / float_le / float_gt / float_ge → `fcmp`).
pub(crate) fn builtin_binop_typed(
name: &str,
arg_ty: &Type,
@@ -257,23 +237,6 @@ pub(crate) fn builtin_binop_typed(
("/", true, _) => Some(("sdiv", "i64", "i64")),
("/", _, true) => Some(("fdiv", "double", "double")),
("%", true, _) => Some(("srem", "i64", "i64")),
// Comparison ops: operand types differ, result is always `i1`.
// Int-arm comparisons preserved from pre-iter-4 `builtin_binop`;
// Float arms land in iter 4.3.
("!=", true, _) => Some(("icmp ne", "i64", "i1")),
("<", true, _) => Some(("icmp slt", "i64", "i1")),
("<=", true, _) => Some(("icmp sle", "i64", "i1")),
(">", true, _) => Some(("icmp sgt", "i64", "i1")),
(">=", true, _) => Some(("icmp sge", "i64", "i1")),
// Float comparison arms (Floats iter 4.3). Note: `!=` Float
// uses `fcmp une` ("unordered or not equal") — NOT `one`
// ("ordered and not equal"), which would return `false` for
// `nan != nan` and violate IEEE / spec A5.
("!=", _, true) => Some(("fcmp une", "double", "i1")),
("<", _, true) => Some(("fcmp olt", "double", "i1")),
("<=", _, true) => Some(("fcmp ole", "double", "i1")),
(">", _, true) => Some(("fcmp ogt", "double", "i1")),
(">=", _, true) => Some(("fcmp oge", "double", "i1")),
_ => None,
}
}