IVGCVSW-3307 Introduce RefTensorHandle

Use it for intermediate tensors on reference backend.
Lays the groundwork for memory management in the reference backend.

Change-Id: I7d3ee132cac31bde70ae6e1b815f4f0b03d550a6
Signed-off-by: Matthew Bentham <Matthew.Bentham@arm.com>

1 files changed, 7 insertions, 14 deletions

diff --git a/src/backends/backendsCommon/CpuTensorHandle.hpp b/src/backends/backendsCommon/CpuTensorHandle.hpp
index dd6413f2e7..5fefc125c1 100644
--- a/src/backends/backendsCommon/CpuTensorHandle.hpp
+++ b/src/backends/backendsCommon/CpuTensorHandle.hpp
@@ -16,6 +16,10 @@
 namespace armnn
 {
 
+// Get a TensorShape representing the strides (in bytes) for each dimension
+// of a tensor, assuming fully packed data with no padding
+TensorShape GetUnpaddedTensorStrides(const TensorInfo& tensorInfo);
+
 // Abstract tensor handles wrapping a CPU-readable region of memory, interpreting it as tensor data.
 class ConstCpuTensorHandle : public ITensorHandle
 {
@@ -41,18 +45,7 @@ public:
 
     TensorShape GetStrides() const override
     {
-        TensorShape shape(m_TensorInfo.GetShape());
-        auto size = GetDataTypeSize(m_TensorInfo.GetDataType());
-        auto runningSize = size;
-        std::vector<unsigned int> strides(shape.GetNumDimensions());
-        auto lastIdx = shape.GetNumDimensions()-1;
-        for (unsigned int i=0; i < lastIdx ; i++)
-        {
-            strides[lastIdx-i] = runningSize;
-            runningSize *= shape[lastIdx-i];
-        }
-        strides[0] = runningSize;
-        return TensorShape(shape.GetNumDimensions(), strides.data());
+        return GetUnpaddedTensorStrides(m_TensorInfo);
     }
     TensorShape GetShape() const override { return m_TensorInfo.GetShape(); }
 
@@ -63,8 +56,8 @@ protected:
 
 private:
     // Only used for testing
-    void CopyOutTo(void *) const override {}
-    void CopyInFrom(const void*) override {}
+    void CopyOutTo(void *) const override { BOOST_ASSERT_MSG(false, "Unimplemented"); }
+    void CopyInFrom(const void*) override { BOOST_ASSERT_MSG(false, "Unimplemented"); }
 
     ConstCpuTensorHandle(const ConstCpuTensorHandle& other) = delete;
     ConstCpuTensorHandle& operator=(const ConstCpuTensorHandle& other) = delete;