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Remove a use of zip/to_array in eval (#6393)

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The to_array was mainly needed for zip_equal, and the
GetBlockAsTypeInstIds is forming a vector that should also be size two.
But just writing this out should avoid memory allocations.

Of course, then I'm like "but maybe a lambda or function would be
clearer than a for loop"... So the second commit.
This commit is contained in:
Jon Ross-Perkins
2025-11-18 19:19:40 +00:00
committed by GitHub
parent 7c1077c436
commit ee49d65e29
1 changed files with 23 additions and 21 deletions
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toolchain/check/eval.cpp
+23 -21
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@@ -1649,6 +1649,26 @@ static auto PerformBuiltinBoolComparison(
: lhs != rhs);
}
// Converts a call argument to a FacetTypeId.
static auto ArgToFacetTypeId(Context& context, SemIR::LocId loc_id,
SemIR::InstId arg_id) -> SemIR::FacetTypeId {
auto type_arg_id = context.types().GetAsTypeInstId(arg_id);
if (auto facet_type =
context.insts().TryGetAs<SemIR::FacetType>(type_arg_id)) {
return facet_type->facet_type_id;
}
CARBON_DIAGNOSTIC(FacetTypeRequiredForTypeAndOperator, Error,
"non-facet type {0} combined with `&` operator",
SemIR::TypeId);
// TODO: Find a location for the lhs or rhs specifically, instead of
// the whole thing. If that's not possible we can change the text to
// say if it's referring to the left or the right side for the error.
// The `arg_id` instruction has no location in it for some reason.
context.emitter().Emit(loc_id, FacetTypeRequiredForTypeAndOperator,
context.types().GetTypeIdForTypeInstId(type_arg_id));
return SemIR::FacetTypeId::None;
}
// Returns a constant for a call to a builtin function.
static auto MakeConstantForBuiltinCall(EvalContext& eval_context,
SemIR::LocId loc_id, SemIR::Call call,
@@ -1718,27 +1738,9 @@ static auto MakeConstantForBuiltinCall(EvalContext& eval_context,
case SemIR::BuiltinFunctionKind::TypeAnd: {
CARBON_CHECK(arg_ids.size() == 2);
auto lhs_facet_type_id = SemIR::FacetTypeId::None;
auto rhs_facet_type_id = SemIR::FacetTypeId::None;
for (auto [facet_type_id, type_arg_id] : llvm::zip_equal(
std::to_array({&lhs_facet_type_id, &rhs_facet_type_id}),
context.types().GetBlockAsTypeInstIds(arg_ids))) {
if (auto facet_type =
context.insts().TryGetAs<SemIR::FacetType>(type_arg_id)) {
*facet_type_id = facet_type->facet_type_id;
} else {
CARBON_DIAGNOSTIC(FacetTypeRequiredForTypeAndOperator, Error,
"non-facet type {0} combined with `&` operator",
SemIR::TypeId);
// TODO: Find a location for the lhs or rhs specifically, instead of
// the whole thing. If that's not possible we can change the text to
// say if it's referring to the left or the right side for the error.
// The `arg_id` instruction has no location in it for some reason.
context.emitter().Emit(
loc_id, FacetTypeRequiredForTypeAndOperator,
context.types().GetTypeIdForTypeInstId(type_arg_id));
}
}
auto lhs_facet_type_id = ArgToFacetTypeId(context, loc_id, arg_ids[0]);
auto rhs_facet_type_id = ArgToFacetTypeId(context, loc_id, arg_ids[1]);
// Allow errors to be diagnosed for both sides of the operator before
// returning here if any error occurred on either side.
if (!lhs_facet_type_id.has_value() || !rhs_facet_type_id.has_value()) {