IVGCVSW-2511 Add end to end Gather layer test

 * Add end to end test for Gather operator
 * Add Support for int32 to Constant layer for Ref
 * Add Int32Workload
 * Add RefConstantWorkload as template for float, uint8, int32
 * Remove unused RefBaseConstantWorkload
 * Remove unused RefConstantFloat32Workload
 * Remove unused RefConstantUint8Workload
 * Add support check for int32 in LayerSupport functions

Change-Id: Ic970588a49ebe2aafb12be8adef52371feacaa7b

1 files changed, 52 insertions, 0 deletions

diff --git a/src/backends/reference/workloads/RefConstantWorkload.cpp b/src/backends/reference/workloads/RefConstantWorkload.cpp
new file mode 100644
index 0000000000..e074c6fb04
--- /dev/null
+++ b/src/backends/reference/workloads/RefConstantWorkload.cpp
@@ -0,0 +1,52 @@
+//
+// Copyright © 2017 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#include "RefConstantWorkload.hpp"
+
+#include "RefWorkloadUtils.hpp"
+
+#include <armnn/Types.hpp>
+
+#include <boost/assert.hpp>
+
+#include <cstring>
+
+namespace armnn
+{
+
+template <armnn::DataType DataType>
+void RefConstantWorkload<DataType>::Execute() const
+{
+    // Considering the reference backend independently, it could be possible to initialise the intermediate tensor
+    // created by the layer output handler at workload construction time, rather than at workload execution time.
+    // However, this is not an option for other backends (e.g. CL). For consistency, we prefer to align all
+    // implementations.
+    // A similar argument can be made about performing the memory copy in the first place (the layer output handler
+    // could have a non-owning reference to the layer output tensor managed by the const input layer); again, this is
+    // not an option for other backends, and the extra complexity required to make this work for the reference backend
+    // may not be worth the effort (skipping a memory copy in the first inference).
+    ARMNN_SCOPED_PROFILING_EVENT(Compute::CpuRef, "RefConstantWorkload_Execute");
+
+    if (!m_RanOnce)
+    {
+        const ConstantQueueDescriptor& data = this->m_Data;
+
+        BOOST_ASSERT(data.m_LayerOutput != nullptr);
+
+        const TensorInfo& outputInfo = GetTensorInfo(data.m_Outputs[0]);
+        BOOST_ASSERT(data.m_LayerOutput->GetTensorInfo().GetNumBytes() == outputInfo.GetNumBytes());
+
+        memcpy(GetOutputTensorData<void>(0, data), data.m_LayerOutput->GetConstTensor<void>(),
+            outputInfo.GetNumBytes());
+
+        m_RanOnce = true;
+    }
+}
+
+template class RefConstantWorkload<DataType::Float32>;
+template class RefConstantWorkload<DataType::QuantisedAsymm8>;
+template class RefConstantWorkload<DataType::Signed32>;
+
+} //namespace armnn