diff --git a/include/sirit/sirit.h b/include/sirit/sirit.h
index f314c11..bdd42c6 100644
--- a/include/sirit/sirit.h
+++ b/include/sirit/sirit.h
@@ -672,6 +672,12 @@ public:
     /// Floating-point multiplication of Operand 1 and Operand 2.
     Id OpFMul(Id result_type, Id operand_1, Id operand_2);
 
+    /// Full signed interger multiplication of Operand 1 and Operand 2.
+    Id OpSMulExtended(Id result_type, Id operand_1, Id operand_2);
+
+    /// Full unsigned interger multiplication of Operand 1 and Operand 2.
+    Id OpUMulExtended(Id result_type, Id operand_1, Id operand_2);
+
     /// Unsigned-integer division of Operand 1 divided by Operand 2.
     Id OpUDiv(Id result_type, Id operand_1, Id operand_2);
 
diff --git a/src/instructions/arithmetic.cpp b/src/instructions/arithmetic.cpp
index ab62177..04963e1 100644
--- a/src/instructions/arithmetic.cpp
+++ b/src/instructions/arithmetic.cpp
@@ -30,6 +30,8 @@ DEFINE_BINARY(OpFAdd, spv::Op::OpFAdd)
 DEFINE_BINARY(OpISub, spv::Op::OpISub)
 DEFINE_BINARY(OpFSub, spv::Op::OpFSub)
 DEFINE_BINARY(OpIMul, spv::Op::OpIMul)
+DEFINE_BINARY(OpUMulExtended, spv::Op::OpUMulExtended)
+DEFINE_BINARY(OpSMulExtended, spv::Op::OpSMulExtended)
 DEFINE_BINARY(OpFMul, spv::Op::OpFMul)
 DEFINE_BINARY(OpUDiv, spv::Op::OpUDiv)
 DEFINE_BINARY(OpSDiv, spv::Op::OpSDiv)