Integrate improved pooling layer on NEON

Resolves COMPMID-4035

Change-Id: I559f8c4208fba9193dfe5012f03ddaf26c746215
Signed-off-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/4855
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/runtime/NEON/functions/NEPoolingAssemblyDispatch.h b/src/runtime/NEON/functions/NEPoolingAssemblyDispatch.h
new file mode 100644
index 0000000..f6d232b
--- /dev/null
+++ b/src/runtime/NEON/functions/NEPoolingAssemblyDispatch.h
@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 2021 Arm Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef ARM_COMPUTE_NEPOOLINGASSEMBLYDISPATCH_H
+#define ARM_COMPUTE_NEPOOLINGASSEMBLYDISPATCH_H
+
+#include "arm_compute/runtime/IFunction.h"
+#include "arm_compute/runtime/IMemoryManager.h"
+#include "arm_compute/runtime/MemoryGroup.h"
+#include "arm_compute/runtime/NEON/INEOperator.h"
+#include "arm_compute/runtime/Tensor.h"
+#include "src/core/NEON/INEKernel.h"
+
+namespace arm_compute
+{
+// Forward Declarations
+class ITensor;
+struct PoolingLayerInfo;
+
+/** Assembly kernel glue */
+class NEPoolingAssemblyDispatch : public IFunction
+{
+public:
+    /** Constructor */
+    NEPoolingAssemblyDispatch(std::shared_ptr<IMemoryManager> memory_manager = nullptr);
+    /** Prevent instances of this class from being copied (As this class contains pointers) */
+    NEPoolingAssemblyDispatch(const NEPoolingAssemblyDispatch &) = delete;
+    /** Default move constructor */
+    NEPoolingAssemblyDispatch(NEPoolingAssemblyDispatch &&);
+    /** Prevent instances of this class from being copied (As this class contains pointers) */
+    NEPoolingAssemblyDispatch &operator=(const NEPoolingAssemblyDispatch &) = delete;
+    /** Default move assignment operator */
+    NEPoolingAssemblyDispatch &operator=(NEPoolingAssemblyDispatch &&);
+    /** Destructor */
+    ~NEPoolingAssemblyDispatch();
+
+    /** If supported create an assembly routine, else fallback to Compute Library function.
+     *
+     * @param[in]  input  Input tensor. Data types supported: QASYMM8/QASYMM8_SIGNED/F16/F32.
+     * @param[out] output Output tensor to store the result of pooling. Data types supported: same as @p input.
+     * @param[in]  info   Pooling meta-data
+     */
+    void configure(const ITensor *input, ITensor *output, const PoolingLayerInfo &info);
+
+    /** Indicates whether or not this function can be used to process the given parameters.
+     *
+     * @param[in] input  Input tensor info. Data types supported: QASYMM8/QASYMM8_SIGNED/F16/F32.
+     * @param[in] output Output tensor to store the result of pooling. Data types supported: same as @p input.
+     * @param[in] info   Pooling meta-data
+     *
+     * @return a status.
+     */
+    static Status validate(const ITensorInfo *input, const ITensorInfo *output, const PoolingLayerInfo &info);
+
+    /** Was the function successfully configured ?
+     *
+     * @return True if the function is configured and ready to run
+     */
+    bool is_configured() const;
+
+    // Inherited methods overridden:
+    void run() override;
+
+private:
+    /** Helper function to allocate memory for the workspace needed by the
+     * assembly kernels
+     *
+     * @param[in] workspace_size Total size of the workspace.
+     * @param[in] alignment      Alignment requirement in bytes.
+     */
+    void allocate_workspace(size_t workspace_size, size_t alignment);
+
+    struct Impl;
+    std::unique_ptr<Impl> _impl;
+
+    MemoryGroup _memory_group{};
+    Tensor      _workspace{};
+};
+
+namespace experimental
+{
+/** Basic function to run pooling assembly kernels */
+class NEPoolingAssemblyDispatch : public INEOperator
+{
+public:
+    /** Constructor */
+    NEPoolingAssemblyDispatch() = default;
+    /** Prevent instances of this class from being copied */
+    NEPoolingAssemblyDispatch(const NEPoolingAssemblyDispatch &) = delete;
+    /** Default move constructor */
+    NEPoolingAssemblyDispatch(NEPoolingAssemblyDispatch &&) = default;
+    /** Prevent instances of this class from being copied */
+    NEPoolingAssemblyDispatch &operator=(const NEPoolingAssemblyDispatch &) = delete;
+    /** Default move assignment operator */
+    NEPoolingAssemblyDispatch &operator=(NEPoolingAssemblyDispatch &&) = default;
+    /** Destructor */
+    ~NEPoolingAssemblyDispatch();
+
+    /** If supported create an assembly routine, else fallback to Compute Library function.
+     *
+     * @param[in]  input  Input tensor. Data types supported: QASYMM8/QASYMM8_SIGNED/F16/F32.
+     * @param[out] output Output tensor to store the result of pooling. Data types supported: same as @p input.
+     * @param[in]  info   Pooling meta-data
+     */
+    void configure(const ITensorInfo *input, ITensorInfo *output, const PoolingLayerInfo &info);
+
+    /** Indicates whether or not this function can be used to process the given parameters.
+     *
+     * @param[in] input  Input tensor info. Data types supported: QASYMM8/QASYMM8_SIGNED/F16/F32.
+     * @param[in] output Output tensor to store the result of pooling. Data types supported: same as @p input.
+     * @param[in] info   Pooling meta-data
+     *
+     * @return a status.
+     */
+    static Status validate(const ITensorInfo *input, const ITensorInfo *output, const PoolingLayerInfo &info);
+    /** Was the function successfully configured ?
+     *
+     * @return True if the function is configured and ready to run
+     */
+    bool is_configured() const;
+    // Run method overriden
+    void run(ITensorPack &tensors) override;
+
+private:
+    bool _is_global_pooling_layer{ false };
+};
+} // namespace experimental
+} // namespace arm_compute
+#endif /* ARM_COMPUTE_NEPOOLINGASSEMBLYDISPATCH_H */