GitHub #640 Add support for CEIL operator

* Reference workload
* TfLite Delegate
* TfLite Parser
* Serializer and Deserializer
* Changed fallback tests in delegate to use COS instead of CEIL

Signed-off-by: Teresa Charlin <teresa.charlinreyes@arm.com>
Signed-off-by: Mike Kelly <mike.kelly@arm.com>
Change-Id: I36e0dbff33694182d1dba0c95d463506428e2f04

3 files changed, 36 insertions, 3 deletions

diff --git a/src/backends/reference/workloads/Ceil.hpp b/src/backends/reference/workloads/Ceil.hpp
new file mode 100644
index 0000000000..2e415b9c0a
--- /dev/null
+++ b/src/backends/reference/workloads/Ceil.hpp
@@ -0,0 +1,25 @@
+//
+// Copyright © 2023 Arm Ltd and Contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#pragma once
+
+#include <iostream>
+
+namespace armnn
+{
+template<typename T>
+struct ceil
+    {
+        typedef T result_type;
+        typedef T argument_type;
+
+        T
+        operator () (const T&  inputData) const
+        {
+            return std::ceil(inputData);
+        }
+    };
+
+} //namespace armnn
diff --git a/src/backends/reference/workloads/ElementwiseFunction.cpp b/src/backends/reference/workloads/ElementwiseFunction.cpp
index 82bcf99287..c5b0ad1f24 100644
--- a/src/backends/reference/workloads/ElementwiseFunction.cpp
+++ b/src/backends/reference/workloads/ElementwiseFunction.cpp
@@ -1,14 +1,14 @@
 //
-// Copyright © 2017 Arm Ltd and Contributors. All rights reserved.
+// Copyright © 2017-2021,2023 Arm Ltd and Contributors. All rights reserved.
 // SPDX-License-Identifier: MIT
 //
 
 #include "ElementwiseFunction.hpp"
 #include "Broadcast.hpp"
-#include <functional>
 #include "Minimum.hpp"
 #include "Maximum.hpp"
 #include "Abs.hpp"
+#include "Ceil.hpp"
 #include "Exp.hpp"
 #include "Log.hpp"
 #include "Rsqrt.hpp"
@@ -85,6 +85,7 @@ template struct armnn::ElementwiseBinaryFunction<std::not_equal_to<float>>;
 
 // Unary
 template struct armnn::ElementwiseUnaryFunction<armnn::abs<float>>;
+template struct armnn::ElementwiseUnaryFunction<armnn::ceil<float>>;
 template struct armnn::ElementwiseUnaryFunction<armnn::exp<float>>;
 template struct armnn::ElementwiseUnaryFunction<armnn::log<float>>;
 template struct armnn::ElementwiseUnaryFunction<std::negate<float>>;
diff --git a/src/backends/reference/workloads/RefElementwiseUnaryWorkload.cpp b/src/backends/reference/workloads/RefElementwiseUnaryWorkload.cpp
index 4bd5a51a52..f4775e0c19 100644
--- a/src/backends/reference/workloads/RefElementwiseUnaryWorkload.cpp
+++ b/src/backends/reference/workloads/RefElementwiseUnaryWorkload.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright © 2022 Arm Ltd and Contributors. All rights reserved.
+// Copyright © 2020-2023 Arm Ltd and Contributors. All rights reserved.
 // SPDX-License-Identifier: MIT
 //
 
@@ -10,6 +10,7 @@
 #include "Encoders.hpp"
 #include "RefWorkloadUtils.hpp"
 #include "Abs.hpp"
+#include "Ceil.hpp"
 #include "Exp.hpp"
 #include "Log.hpp"
 #include "Rsqrt.hpp"
@@ -56,6 +57,7 @@ void RefElementwiseUnaryWorkload::Execute(std::vector<ITensorHandle*> inputs, st
     std::unique_ptr<Encoder<OutType>> output= MakeEncoder<OutType>(outputInfo, outputs[0]->Map());
 
     using AbsFunction   = ElementwiseUnaryFunction<abs<InType>>;
+    using CeilFunction  = ElementwiseUnaryFunction<ceil<InType>>;
     using ExpFunction   = ElementwiseUnaryFunction<exp<InType>>;
     using LogFunction   = ElementwiseUnaryFunction<log<InType>>;
     using NegFunction   = ElementwiseUnaryFunction<std::negate<InType>>;
@@ -70,6 +72,11 @@ void RefElementwiseUnaryWorkload::Execute(std::vector<ITensorHandle*> inputs, st
             AbsFunction(inShape, outShape, *input, *output);
             break;
         }
+        case UnaryOperation::Ceil:
+        {
+            CeilFunction(inShape, outShape, *input, *output);
+            break;
+        }
         case UnaryOperation::Exp:
         {
             ExpFunction(inShape, outShape, *input, *output);