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diff --git a/tests/validation/CPP/Magnitude.cpp b/tests/validation/CPP/Magnitude.cpp
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+/*
+ * Copyright (c) 2017 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "Magnitude.h"
+
+namespace arm_compute
+{
+namespace test
+{
+namespace validation
+{
+namespace reference
+{
+template <typename T>
+SimpleTensor<T> magnitude(const SimpleTensor<T> &gx, const SimpleTensor<T> &gy, MagnitudeType magnitude_type)
+{
+    SimpleTensor<T> mag(gx.shape(), gx.data_type());
+
+    using intermediate_type = typename common_promoted_unsigned_type<T>::intermediate_type;
+
+    for(int i = 0; i < gx.num_elements(); ++i)
+    {
+        double val = 0.f;
+
+        if(magnitude_type == MagnitudeType::L1NORM)
+        {
+            val = static_cast<intermediate_type>(std::abs(gx[i])) + static_cast<intermediate_type>(std::abs(gy[i]));
+        }
+        else // MagnitudeType::L2NORM
+        {
+            // Note: kernel saturates to uint32_t instead of intermediate_type for S32 format
+            auto sum = static_cast<uint32_t>(gx[i] * gx[i]) + static_cast<uint32_t>(gy[i] * gy[i]);
+            val      = std::sqrt(sum) + 0.5f;
+        }
+
+        mag[i] = saturate_cast<T>(val);
+    }
+
+    return mag;
+}
+
+template SimpleTensor<int16_t> magnitude(const SimpleTensor<int16_t> &gx, const SimpleTensor<int16_t> &gy, MagnitudeType magnitude_type);
+template SimpleTensor<int32_t> magnitude(const SimpleTensor<int32_t> &gx, const SimpleTensor<int32_t> &gy, MagnitudeType magnitude_type);
+template SimpleTensor<half_float::half> magnitude(const SimpleTensor<half_float::half> &gx, const SimpleTensor<half_float::half> &gy, MagnitudeType magnitude_type);
+} // namespace reference
+} // namespace validation
+} // namespace test
+} // namespace arm_compute