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/gpu/cl/kernels/ClGemmLowpOffsetContributionKernel.h b/src/gpu/cl/kernels/ClGemmLowpOffsetContributionKernel.h
new file mode 100644
index 0000000..48926e2
--- /dev/null
+++ b/src/gpu/cl/kernels/ClGemmLowpOffsetContributionKernel.h
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2017-2021 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_CL_GEMMLOWP_OFFSET_CONTRIBUTION_KERNEL_H
+#define ARM_COMPUTE_CL_GEMMLOWP_OFFSET_CONTRIBUTION_KERNEL_H
+
+#include "src/core/common/Macros.h"
+#include "src/gpu/cl/ClCompileContext.h"
+#include "src/gpu/cl/IClKernel.h"
+
+namespace arm_compute
+{
+namespace opencl
+{
+namespace kernels
+{
+/** OpenCL kernel used to add the offset contribution after the matrix multiplication. The computation is performed in-place
+ *
+ * This kernel takes a final int32 accumulator value (the output of the matrix multiplication),
+ * and adds to it the offset contribution of matrix A and matrix B in-place.
+ *
+ * The final result is:
+ *
+ * mm_result[i][k] = mm_result[i][k] +
+ *                   (vector_sum_col[k] * a_offset) +
+ *                   (vector_sum_row[i] * b_offset) +
+ *                   (a_offset * b_offset * k)
+ *
+ */
+class ClGemmLowpOffsetContributionKernel : public IClKernel
+{
+public:
+    ClGemmLowpOffsetContributionKernel();
+    ARM_COMPUTE_DISALLOW_COPY_ALLOW_MOVE(ClGemmLowpOffsetContributionKernel);
+    /** Initialise the kernel's input and output.
+     *
+     * @param[in]      compile_context The compile context to be used.
+     * @param[in, out] mm_result       Input tensor containing the result of the matrix multiplication. Data type supported: S32
+     * @param[in]      vector_sum_col  Input row-vector of sums of all the entries in each column of matrix B.
+     *                                 Note: vector_sum_col can be a nullptr in case a_offset = 0. Data type supported: same as @p mm_result
+     * @param[in]      vector_sum_row  Input row-vector of sums of all the entries in each row of matrix A.
+     *                                 Note: vector_sum_row can be a nullptr in case b_offset = 0. Data type supported: same as @p mm_result
+     * @param[in]      bias            Biases tensor. Only shared biases supported and it can be a nullptr if the addition of biases is not required.
+     *                                 Biases are 1D tensor with dimensions [OFM]. Data type supported: Same as @p input.
+     * @param[in]      k               Number of matrix A columns or Matrix B rows
+     * @param[in]      a_offset        Offset to be added to each element of the matrix A.
+     * @param[in]      b_offset        Offset to be added to each element of the matrix B.
+     */
+    void configure(const CLCompileContext &compile_context,
+                   const ITensorInfo *mm_result, const ITensorInfo *vector_sum_col, const ITensorInfo *vector_sum_row, const ITensorInfo *bias,
+                   int32_t k, int32_t a_offset, int32_t b_offset);
+    /** Static function to check if given info will lead to a valid configuration
+     *
+     * Similar to @ref ClGemmLowpOffsetContributionKernel::configure()
+     *
+     * @return a status
+     */
+    static Status validate(const ITensorInfo *mm_result, const ITensorInfo *vector_sum_col, const ITensorInfo *vector_sum_row, const ITensorInfo *bias, int32_t a_offset, int32_t b_offset);
+
+    // Inherited methods overridden:
+    void run_op(ITensorPack &tensors, const Window &window, cl::CommandQueue &queue) override;
+};
+} // namespace kernels
+} // namespace opencl
+} // namespace arm_compute
+#endif /* ARM_COMPUTE_CL_GEMMLOWP_OFFSET_CONTRIBUTION_KERNEL_H */