IVGCVSW-4212 Example of standalone dynamic reference backend

 * Add example to build dynamic reference backend
 * Add functions to clear dynamic backends
 * Fix the error when dynamic backend is not deregistered
 * Add DYARMNN_DYNAMIC_BACKEND_ENABLED to check disable empty
   dynamic backend when dynamic backend is enabled

Signed-off-by: Narumol Prangnawarat <narumol.prangnawarat@arm.com>
Change-Id: I1ef3a3f10ed6ca5ec18d0af04b007fc3bc71a3cb

1 files changed, 20 insertions, 1 deletions

diff --git a/src/armnn/DeviceSpec.hpp b/src/armnn/DeviceSpec.hpp
index 32264706fd..703a4b123f 100644
--- a/src/armnn/DeviceSpec.hpp
+++ b/src/armnn/DeviceSpec.hpp
@@ -24,14 +24,33 @@ public:
         return m_SupportedBackends;
     }
 
-    void AddSupportedBackends(const BackendIdSet& backendIds)
+    void AddSupportedBackends(const BackendIdSet& backendIds, bool isDynamic = false)
     {
         m_SupportedBackends.insert(backendIds.begin(), backendIds.end());
+        if (isDynamic)
+        {
+            m_DynamicBackends.insert(backendIds.begin(), backendIds.end());
+        }
+    }
+
+    void ClearDynamicBackends()
+    {
+        for (const auto& id : m_DynamicBackends)
+        {
+            m_SupportedBackends.erase(id);
+        }
+        m_DynamicBackends.clear();
+    }
+
+    const BackendIdSet& GetDynamicBackends() const
+    {
+        return m_DynamicBackends;
     }
 
 private:
     DeviceSpec() = delete;
     BackendIdSet m_SupportedBackends;
+    BackendIdSet m_DynamicBackends;
 };
 
 } // namespace armnn