compiler: improve target features support

src/types.cpp

@@ -184,6 +184,8 @@ struct TypeProc {
 	isize    specialization_count;
 	ProcCallingConvention calling_convention;
 	i32      variadic_index;
+	String   require_target_feature;
+	String   enable_target_feature;
 	// TODO(bill): Make this a flag set rather than bools
 	bool     variadic;
 	bool     require_results;
@@ -2991,7 +2993,22 @@ gb_internal Type *union_tag_type(Type *u) {
 	return t_uint;
 }
 
+gb_internal int matched_target_features(TypeProc *t) {
+	if (t->require_target_feature.len == 0) {
+		return 0;
+	}
 
+	int matches = 0;
+	String_Iterator it = {t->require_target_feature, 0};
+	for (;;) {
+		String str = string_split_iterator(&it, ',');
+		if (str == "") break;
+		if (check_target_feature_is_valid_for_target_arch(str, nullptr)) {
+			matches += 1;
+		}
+	}
+	return matches;
+}
 
 enum ProcTypeOverloadKind {
 	ProcOverload_Identical, // The types are identical
@@ -3003,6 +3020,7 @@ enum ProcTypeOverloadKind {
 	ProcOverload_ResultCount,
 	ProcOverload_ResultTypes,
 	ProcOverload_Polymorphic,
+	ProcOverload_TargetFeatures,
 
 	ProcOverload_NotProcedure,
 
@@ -3060,6 +3078,10 @@ gb_internal ProcTypeOverloadKind are_proc_types_overload_safe(Type *x, Type *y)
 		}
 	}
 
+	if (matched_target_features(&px) != matched_target_features(&py)) {
+		return ProcOverload_TargetFeatures;
+	}
+
 	if (px.params != nullptr && py.params != nullptr) {
 		Entity *ex = px.params->Tuple.variables[0];
 		Entity *ey = py.params->Tuple.variables[0];