diff --git a/src/writer/spirv/builder.cc b/src/writer/spirv/builder.cc
index f2b220c..382681b 100644
--- a/src/writer/spirv/builder.cc
+++ b/src/writer/spirv/builder.cc
@@ -1284,6 +1284,8 @@
     op = spv::Op::OpIsInf;
   } else if (name == "is_nan") {
     op = spv::Op::OpIsNan;
+  } else if (name == "outer_product") {
+    op = spv::Op::OpOuterProduct;
   }
   if (op == spv::Op::OpNop) {
     error_ = "unable to determine operator for: " + name;
diff --git a/src/writer/spirv/builder_intrinsic_test.cc b/src/writer/spirv/builder_intrinsic_test.cc
index 34d434e..ea4974c 100644
--- a/src/writer/spirv/builder_intrinsic_test.cc
+++ b/src/writer/spirv/builder_intrinsic_test.cc
@@ -19,6 +19,7 @@
 #include "src/ast/identifier_expression.h"
 #include "src/ast/type/bool_type.h"
 #include "src/ast/type/f32_type.h"
+#include "src/ast/type/matrix_type.h"
 #include "src/ast/type/vector_type.h"
 #include "src/ast/variable.h"
 #include "src/context.h"
@@ -304,6 +305,57 @@
                     IntrinsicData{"fwidth_fine", "OpFwidthFine"},
                     IntrinsicData{"fwidth_coarse", "OpFwidthCoarse"}));
 
+TEST_F(BuilderTest, Call_OuterProduct) {
+  ast::type::F32Type f32;
+  ast::type::VectorType vec2(&f32, 2);
+  ast::type::VectorType vec3(&f32, 3);
+  ast::type::MatrixType mat(&f32, 2, 3);
+
+  auto v2 =
+      std::make_unique<ast::Variable>("v2", ast::StorageClass::kPrivate, &vec2);
+  auto v3 =
+      std::make_unique<ast::Variable>("v3", ast::StorageClass::kPrivate, &vec3);
+
+  ast::ExpressionList params;
+  params.push_back(std::make_unique<ast::IdentifierExpression>("v2"));
+  params.push_back(std::make_unique<ast::IdentifierExpression>("v3"));
+  ast::CallExpression expr(
+      std::make_unique<ast::IdentifierExpression>("outer_product"),
+      std::move(params));
+
+  Context ctx;
+  ast::Module mod;
+  TypeDeterminer td(&ctx, &mod);
+  td.RegisterVariableForTesting(v2.get());
+  td.RegisterVariableForTesting(v3.get());
+
+  ASSERT_TRUE(td.DetermineResultType(&expr)) << td.error();
+
+  Builder b(&mod);
+  b.push_function(Function{});
+  ASSERT_TRUE(b.GenerateGlobalVariable(v2.get())) << b.error();
+  ASSERT_TRUE(b.GenerateGlobalVariable(v3.get())) << b.error();
+
+  EXPECT_EQ(b.GenerateCallExpression(&expr), 10u) << b.error();
+
+  EXPECT_EQ(DumpInstructions(b.types()), R"(%4 = OpTypeFloat 32
+%3 = OpTypeVector %4 2
+%2 = OpTypePointer Private %3
+%5 = OpConstantNull %3
+%1 = OpVariable %2 Private %5
+%8 = OpTypeVector %4 3
+%7 = OpTypePointer Private %8
+%9 = OpConstantNull %8
+%6 = OpVariable %7 Private %9
+%11 = OpTypeMatrix %3 3
+)");
+  EXPECT_EQ(DumpInstructions(b.functions()[0].instructions()),
+            R"(%12 = OpLoad %3 %1
+%13 = OpLoad %8 %6
+%10 = OpOuterProduct %11 %12 %13
+)");
+}
+
 }  // namespace
 }  // namespace spirv
 }  // namespace writer