Move CPU/GPU files from Core/Runtime to the respective backend folders

Legacy structure contained two libraries core/runtime with two backends
in each.
We reduce the core/runtime libraries to a single library thus merging
the backend files

Signed-off-by: Georgios Pinitas <georgios.pinitas@arm.com>
Change-Id: I69545765fe7a730368105cdbd067d3135ec7a174
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/6155
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/cpu/operators/CpuDepthwiseConv2d.h b/src/cpu/operators/CpuDepthwiseConv2d.h
new file mode 100644
index 0000000..15e52ef
--- /dev/null
+++ b/src/cpu/operators/CpuDepthwiseConv2d.h
@@ -0,0 +1,209 @@
+/*
+ * 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_CPU_DEPTHWISE_CONV2D_H
+#define ARM_COMPUTE_CPU_DEPTHWISE_CONV2D_H
+
+#include "arm_compute/core/ITensorInfo.h"
+#include "arm_compute/core/experimental/Types.h"
+#include "src/cpu/ICpuKernel.h"
+#include "src/cpu/ICpuOperator.h"
+#include "src/cpu/kernels/CpuDepthwiseConv2dNativeKernel.h"
+#include "src/cpu/operators/CpuActivation.h"
+#include "src/cpu/operators/CpuDepthwiseConv2dAssemblyDispatch.h"
+#include "src/cpu/operators/CpuPermute.h"
+
+#include <memory>
+
+namespace arm_compute
+{
+namespace cpu
+{
+/** Function to execute a depthwise convolution.
+ */
+class CpuDepthwiseConv2d : public ICpuOperator
+{
+public:
+    /** Default constructor */
+    CpuDepthwiseConv2d() = default;
+    /** Initialize the function's source, destination, weights and convolution information.
+     *
+     * @param[in, out] src     Source tensor info. Data type supported: QASYMM8/QASYMM8_SIGNED/F16/F32
+     * @param[out]     dst     Destination tensor info. Data type supported: same as @p src.
+     * @param[in]      weights Weights tensor info. These are 3D tensor infos with shape [kernel_x, kernel_y, IFM].
+     *                         Data type supported: Same as @p src or QASYMM8/QASYMM8_SIGNED/QSYMM8_PER_CHANNEL when @p src is QASYMM8/QASYMM8_SIGNED.
+     * @param[in]      biases  Biases tensor info. A 1D tensor with shape [IFM]. Must be nullptr if not needed.
+     *                         Data type supported: Same as @p src, S32 when src is QASYMM8/QASYMM8_SIGNED.
+     * @param[in]      info    Depthwise convolution meta-data.
+     */
+    void configure(ITensorInfo *src, const ITensorInfo *weights, const ITensorInfo *biases, ITensorInfo *dst, const ConvolutionInfo &info);
+    /** Static function to check if given info will lead to a valid configuration
+     *
+     * Similar to CpuDepthwiseConv2d::configure()
+     *
+     * @return a status
+     */
+    static Status validate(const ITensorInfo *src, const ITensorInfo *weights, const ITensorInfo *biases, const ITensorInfo *dst, const ConvolutionInfo &info);
+    /** Static function to choose the best depthwise convolution function for @ref CpuDepthwiseConv2d
+     *
+     * @param[in] src     Source tensor info. Data type supported: QASYMM8/QASYMM8_SIGNED/F16/F32
+     * @param[in] weights Weights tensor info. These are 3D tensors with shape [kernel_x, kernel_y, IFM].
+     *                    Data type supported: Same as @p src or QASYMM8/QASYMM8_SIGNED/QSYMM8_PER_CHANNEL when @p src is QASYMM8/QASYMM8_SIGNED.
+     * @param[in] biases  Biases tensor info. A 1D tensor with shape [IFM]. Must be nullptr if not needed.
+     *                    Data type supported: Same as @p src, S32 when src is QASYMM8/QASYMM8_SIGNED.
+     * @param[in] dst     Destination tensor. Data type supported: same as @p src.
+     * @param[in] info    Depthwise convolution meta-data.
+     *
+     * @return a Depthwise Convolution Function
+     */
+    static DepthwiseConvolutionFunction get_depthwiseconvolution_function(const ITensorInfo *src, const ITensorInfo *weights, const ITensorInfo *biases, const ITensorInfo *dst,
+                                                                          const ConvolutionInfo &info);
+
+    // Inherited methods overriden:
+    void run(ITensorPack &tensors) override;
+    void prepare(ITensorPack &tensors) override;
+
+private:
+    /** Basic function to execute optimized depthwise convolution routines. This function calls the following kernels:
+    *
+    * @note At the moment 3x3 and 5x5 convolution of stride 1, 2 are supported
+    *
+    * -# @ref NEFillBorderKernel (if pad_x or pad_y > 0) and no assembly kernel implementation is present
+    * -# @ref CpuDepthwiseConv2d3x3Kernel if 3x3 and no assembly kernel implementation is present
+    * -# @ref CpuDepthwiseConv2dAssemblyDispatch if assembly kernel implementation is present
+    * -# @ref CpuActivation if fused activation is required
+    *
+    */
+    class CpuDepthwiseConv2dOptimizedInternal : public ICpuOperator
+    {
+    public:
+        /** Default constructor */
+        CpuDepthwiseConv2dOptimizedInternal() = default;
+        /** Prevent instances of this class from being copied (As this class contains pointers) */
+        CpuDepthwiseConv2dOptimizedInternal(const CpuDepthwiseConv2dOptimizedInternal &) = delete;
+        /** Default move constructor */
+        CpuDepthwiseConv2dOptimizedInternal(CpuDepthwiseConv2dOptimizedInternal &&) = default;
+        /** Prevent instances of this class from being copied (As this class contains pointers) */
+        CpuDepthwiseConv2dOptimizedInternal &operator=(const CpuDepthwiseConv2dOptimizedInternal &) = delete;
+        /** Default move assignment operator */
+        CpuDepthwiseConv2dOptimizedInternal &operator=(CpuDepthwiseConv2dOptimizedInternal &&) = default;
+        /** Default destructor */
+        ~CpuDepthwiseConv2dOptimizedInternal() = default;
+        /** Initialize the function's source, destination, kernels and border_size.
+         *
+         * @param[in, out] src     Source tensor info. Data type supported: QASYMM8/QASYMM8_SIGNED/F16/F32. (Written to only for border filling).
+         * @param[in]      weights Weights tensor info. These are 3D tensors with shape [kernel_x, kernel_y, IFM]. Data type supported: Same as @p src.
+         * @param[in]      biases  Biases tensor info. A 1D tensor with shape [IFM]. Must be nullptr if not needed.
+         *                         Data type supported: Same as @p src, S32 when src is QASYMM8/QASYMM8_SIGNED.
+         * @param[out]     dst     Destination tensor info. Data type supported: same as @p src.
+         * @param[in]      info    Depthwise convolution meta-data.
+         */
+        void configure(ITensorInfo *src, const ITensorInfo *weights, const ITensorInfo *biases, ITensorInfo *dst, const ConvolutionInfo &info);
+        /** Static function to check if given info will lead to a valid configuration
+         *
+         * Similar to CpuDepthwiseConv2dOptimizedInternal::configure()
+         *
+         * @return a status
+         */
+        static Status validate(const ITensorInfo *src, const ITensorInfo *weights, const ITensorInfo *biases, const ITensorInfo *dst, const ConvolutionInfo &info);
+
+        // Inherited methods overriden:
+        void run(ITensorPack &tensors) override;
+        void prepare(ITensorPack &tensors) override;
+
+    private:
+        std::unique_ptr<CpuDepthwiseConv2dAssemblyDispatch> _dwc_optimized_func{ nullptr };
+        std::unique_ptr<CpuPermute>                         _permute_input{ nullptr };
+        std::unique_ptr<CpuPermute>                         _permute_weights{ nullptr };
+        std::unique_ptr<CpuPermute>                         _permute_output{ nullptr };
+        std::unique_ptr<CpuActivation>                      _activationlayer_function{ nullptr };
+        bool                                                _has_bias{ false };
+        bool                                                _is_quantized{ false };
+        bool                                                _is_nchw{ true };
+        bool                                                _permute{ false };
+        bool                                                _is_activationlayer_enabled{ false };
+        bool                                                _is_prepared{ false };
+    };
+
+    /** Basic function to execute a generic depthwise convolution. This function calls the following kernel:
+     *
+     * -# @ref CpuDepthwiseConv2dNativeKernel
+     *
+     */
+    class CpuDepthwiseConv2dGeneric : public ICpuOperator
+    {
+    public:
+        /** Default constructor */
+        CpuDepthwiseConv2dGeneric() = default;
+        /** Prevent instances of this class from being copied (As this class contains pointers) */
+        CpuDepthwiseConv2dGeneric(const CpuDepthwiseConv2dGeneric &) = delete;
+        /** Default move constructor */
+        CpuDepthwiseConv2dGeneric(CpuDepthwiseConv2dGeneric &&) = default;
+        /** Prevent instances of this class from being copied (As this class contains pointers) */
+        CpuDepthwiseConv2dGeneric &operator=(const CpuDepthwiseConv2dGeneric &) = delete;
+        /** Default move assignment operator */
+        CpuDepthwiseConv2dGeneric &operator=(CpuDepthwiseConv2dGeneric &&) = default;
+        /** Default destructor */
+        ~CpuDepthwiseConv2dGeneric() = default;
+        /** Initialize the function's source, destination, weights and convolution information.
+         *
+         * @param[in, out] src     Source tensor info. Data type supported: QASYMM8/QASYMM8_SIGNED/F16/F32. (Written to only for border filling).
+         * @param[out]     dst     Destination tensor info. Data type supported: same as @p src.
+         * @param[in]      weights Weights tensor info. These are 3D tensors with shape [kernel_x, kernel_y, IFM].
+         *                         Data type supported: Same as @p src or QASYMM8/QASYMM8_SIGNED/QSYMM8_PER_CHANNEL when @p src is QASYMM8/QASYMM8_SIGNED.
+         * @param[in]      biases  Biases tensor info. A 1D tensor with shape [IFM]. Must be nullptr if not needed.
+         *                         Data type supported: Same as @p src, S32 when src is QASYMM8/QASYMM8_SIGNED.
+         * @param[in]      info    Depthwise convolution meta-data.
+         */
+        void configure(ITensorInfo *src, const ITensorInfo *weights, const ITensorInfo *biases, ITensorInfo *dst, const ConvolutionInfo &info);
+
+        /** Static function to check if given info will lead to a valid configuration
+         *
+         * Similar to CpuDepthwiseConv2dGeneric::configure()
+         *
+         * @return a status
+         */
+        static Status validate(const ITensorInfo *src, const ITensorInfo *weights, const ITensorInfo *biases, const ITensorInfo *dst, const ConvolutionInfo &info);
+
+        // Inherited methods overridden:
+        void run(ITensorPack &tensors) override;
+        void prepare(ITensorPack &tensors) override;
+
+    private:
+        std::unique_ptr<kernels::CpuDepthwiseConv2dNativeKernel> _depthwise_conv_kernel{ nullptr };
+        std::unique_ptr<CpuPermute>                              _permute_input{ nullptr };
+        std::unique_ptr<CpuPermute>                              _permute_weights{ nullptr };
+        std::unique_ptr<CpuPermute>                              _permute_output{ nullptr };
+        std::unique_ptr<CpuActivation>                           _activationlayer_function{ nullptr };
+        bool                                                     _is_nchw{ true };
+        bool                                                     _is_prepared{ false };
+        bool                                                     _is_activationlayer_enabled{ false };
+    };
+
+    DepthwiseConvolutionFunction        _depth_conv_func{ DepthwiseConvolutionFunction::GENERIC };
+    CpuDepthwiseConv2dOptimizedInternal _func_optimized{};
+    CpuDepthwiseConv2dGeneric           _func_generic{};
+};
+} // namespace cpu
+} // namespace arm_compute
+#endif /* ARM_COMPUTE_CPU_DEPTHWISE_CONV2D_H */