From 38e1294770598d49e2a4542d96be0491918546bb Mon Sep 17 00:00:00 2001
From: David Beck <david.beck@arm.com>
Date: Wed, 12 Sep 2018 16:02:24 +0100
Subject: IVGCVSW-1805: model converter functions for the Android 1.1 SUB
 operator

Change-Id: I939cb8d26766c93ee8e3c92909d69549328b0ea7
---
 1.1/HalPolicy.cpp | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1.1/HalPolicy.hpp |  1 +
 2 files changed, 54 insertions(+)

(limited to '1.1')

diff --git a/1.1/HalPolicy.cpp b/1.1/HalPolicy.cpp
index 0e669432..857d29bb 100644
--- a/1.1/HalPolicy.cpp
+++ b/1.1/HalPolicy.cpp
@@ -27,6 +27,8 @@ bool HalPolicy::ConvertOperation(const Operation& operation, const Model& model,
         {
             case V1_1::OperationType::DIV:
                 return ConvertDiv(operation, model, data);
+            case V1_1::OperationType::SUB:
+                return ConvertSub(operation, model, data);
             default:
                 return Fail("%s: Operation type %s not supported in ArmnnDriver",
                             __func__, toString(operation.type).c_str());
@@ -85,5 +87,56 @@ bool HalPolicy::ConvertDiv(const Operation& operation, const Model& model, Conve
     return Fail("%s: ProcessActivation failed", __func__);
 }
 
+bool HalPolicy::ConvertSub(const Operation& operation, const Model& model, ConversionData& data)
+{
+    LayerInputHandle input0 = ConvertToLayerInputHandle(operation, 0, model, data);
+    LayerInputHandle input1 = ConvertToLayerInputHandle(operation, 1, model, data);
+
+    if (!input0.IsValid() || !input1.IsValid())
+    {
+        return Fail("%s: Operation has invalid inputs", __func__);
+    }
+
+    // The FuseActivation parameter is always the input index 2
+    // and it should be optional
+    ActivationFn activationFunction;
+    if (!GetOptionalInputActivation(operation, 2, activationFunction, model, data))
+    {
+        return Fail("%s: Operation has invalid inputs", __func__);
+    }
+
+    const Operand* outputOperand = GetOutputOperand(operation, 0, model);
+    if (!outputOperand)
+    {
+        return false;
+    }
+
+    const armnn::TensorInfo& outInfo = GetTensorInfoForOperand(*outputOperand);
+
+    if (!IsLayerSupported(__func__,
+                          armnn::IsSubtractionSupported,
+                          data.m_Compute,
+                          input0.GetTensorInfo(),
+                          input1.GetTensorInfo(),
+                          outInfo))
+    {
+        return false;
+    }
+
+    armnn::IConnectableLayer* const startLayer = data.m_Network->AddSubtractionLayer();
+    armnn::IConnectableLayer* const endLayer = ProcessActivation(outInfo, activationFunction, startLayer, data);
+
+    const armnn::TensorInfo& inputTensorInfo0 = input0.GetTensorInfo();
+    const armnn::TensorInfo& inputTensorInfo1 = input1.GetTensorInfo();
+
+    if (endLayer)
+    {
+        BroadcastTensor(input0, input1, startLayer, *data.m_Network);
+        return SetupAndTrackLayerOutputSlot(operation, 0, *endLayer, model, data);
+    }
+
+    return Fail("%s: ProcessActivation failed", __func__);
+}
+
 } // namespace hal_1_1
 } // namespace armnn_driver
\ No newline at end of file
diff --git a/1.1/HalPolicy.hpp b/1.1/HalPolicy.hpp
index af858781..3b7fe541 100644
--- a/1.1/HalPolicy.hpp
+++ b/1.1/HalPolicy.hpp
@@ -26,6 +26,7 @@ public:
 
 private:
     static bool ConvertDiv(const Operation& operation, const Model& model, ConversionData& data);
+    static bool ConvertSub(const Operation& operation, const Model& model, ConversionData& data);
 };
 
 } // namespace hal_1_1
-- 
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