# UNDF: UNDF-2026-000000294
--- a/spirv_cross.cpp
+++ b/spirv_cross.cpp
@@ -2605,14 +2605,12 @@ void Compiler::add_implied_read_expression(SPIRExpression &e, uint32_t source)
 {
-	auto itr = find(begin(e.implied_read_expressions), end(e.implied_read_expressions), ID(source));
-	if (itr == end(e.implied_read_expressions))
-		e.implied_read_expressions.push_back(source);
+	// O(1) insert — set semantics handle deduplication automatically.
+	e.implied_read_expressions.insert(source);
 }

 void Compiler::add_implied_read_expression(SPIRAccessChain &e, uint32_t source)
 {
-	auto itr = find(begin(e.implied_read_expressions), end(e.implied_read_expressions), ID(source));
-	if (itr == end(e.implied_read_expressions))
-		e.implied_read_expressions.push_back(source);
+	e.implied_read_expressions.insert(source);
 }

--- a/spirv_cross_parsed_ir.hpp
+++ b/spirv_cross_parsed_ir.hpp
@@ -1,6 +1,7 @@
 // (excerpt — only changed fields shown)
 struct SPIRExpression : IVariant
 {
-	SmallVector<ID> implied_read_expressions;
+	std::unordered_set<uint32_t> implied_read_expressions;
 	...
 };

 struct SPIRAccessChain : IVariant
 {
-	SmallVector<ID> implied_read_expressions;
+	std::unordered_set<uint32_t> implied_read_expressions;
 	...
 };