Port NEDirectConvolutionLayer to new API

Partially resolves: COMPMID-4009

Change-Id: I19ffb61c5c4541134a5028677d2d81228740e454
Signed-off-by: Manuel Bottini <manuel.bottini@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/5419
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: SiCong Li <sicong.li@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
diff --git a/src/core/cpu/kernels/CpuDirectConvolutionOutputStageKernel.h b/src/core/cpu/kernels/CpuDirectConvolutionOutputStageKernel.h
new file mode 100644
index 0000000..9eeab19
--- /dev/null
+++ b/src/core/cpu/kernels/CpuDirectConvolutionOutputStageKernel.h
@@ -0,0 +1,93 @@
+/*
+ * 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_CPU_DIRECTCONVOLUTION_OUTPUTSTAGE_KERNEL_H
+#define ARM_COMPUTE_CPU_DIRECTCONVOLUTION_OUTPUTSTAGE_KERNEL_H
+
+#include "arm_compute/core/KernelDescriptors.h"
+#include "src/core/common/Macros.h"
+#include "src/core/cpu/ICpuKernel.h"
+
+namespace arm_compute
+{
+class ITensor;
+namespace cpu
+{
+namespace kernels
+{
+/** Kernel to accumulate the biases, if provided, or downscale in case of quantized input.
+ *
+ * @note We assume bias to be shared
+ * @note For quantized computations (i.e. @p src of S32 type) the output data type for auto-initialization must be passed as part
+ *       of the @ref DirectConvolutionLayerOutputStageKernelInfo.
+ */
+class CpuDirectConvolutionOutputStageKernel : public ICpuKernel
+{
+public:
+    /** Default constructor */
+    CpuDirectConvolutionOutputStageKernel() = default;
+    ARM_COMPUTE_DISALLOW_COPY_ALLOW_MOVE(CpuDirectConvolutionOutputStageKernel);
+    /** Set the accumulate buffer and the biases of the kernel.
+     *
+     * @param[in, out] src  Input to add the bias to. If @p output is not specified then accumulation is done in-place.
+     *                      Data type supported: F16/F32/S32
+     * @param[in]      bias (Optional) The shared bias tensor to add. It must be 1D Tensor. Data type supported: Same as @p src
+     * @param[out]     dst  (Optional) If the output tensor is specified the accumulation is done out-of-place. (Defaults to nullptr)
+     *                      Note that in-place computation is only supported for F16/F32. For S32 this must not be nullptr.
+     *                      Data type supported: F16/F32 or QASYMM8/QASYMM8_SIGNED if @p src is S32
+     * @param[in]      info (Optional) DirectConvolutionLayerOutputStageKernel descriptor metadata
+     */
+    void configure(ITensorInfo *src, const ITensorInfo *bias = nullptr, ITensorInfo *dst = nullptr,
+                   const DirectConvolutionLayerOutputStageKernelInfo &info = DirectConvolutionLayerOutputStageKernelInfo());
+    /** Static function to check if given info will lead to a valid configuration of @ref CpuDirectConvolutionOutputStageKernel
+     *
+     * @param[in] src  Input to add the bias to. If @p output is not specified then accumulation is done in-place.
+     *                 Data type supported: F16/F32/S32
+     * @param[in] bias (Optional) The shared bias tensor to add. It must be 1D Tensor. Data type supported: Same as @p src
+     * @param[in] dst  (Optional) If the output tensor is specified the accumulation is done out-of-place. (Defaults to nullptr)
+     *                 Note that in-place computation is only supported for F16/F32. For S32 this must not be nullptr.
+     *                 Data type supported: F16/F32 or QASYMM8/QASYMM8_SIGNED if @p src is S32
+     * @param[in] info (Optional) DirectConvolutionLayerOutputStageKernel descriptor metadata
+     *
+     * @return a status
+     */
+    static Status validate(const ITensorInfo *src, const ITensorInfo *bias = nullptr, const ITensorInfo *dst = nullptr,
+                           const DirectConvolutionLayerOutputStageKernelInfo &info = DirectConvolutionLayerOutputStageKernelInfo());
+
+    // Inherited methods overridden:
+    void run_op(ITensorPack &tensors, const Window &window, const ThreadInfo &info) override;
+    const char *name() const override;
+
+private:
+    using OutputStageKernel = void(ITensor *src, const ITensor *bias, const Window &window, ITensor *dst,
+                                   int result_fixedpoint_multiplier, int result_shift, int result_offset_after_shift);
+
+    OutputStageKernel *_func{ nullptr };
+    int                _result_fixedpoint_multiplier{ 0 };
+    int                _result_shift{ 0 };
+    int                _result_offset_after_shift{ 0 };
+};
+} // namespace kernels
+} // namespace cpu
+} // namespace arm_compute
+#endif /*ARM_COMPUTE_CPU_DIRECTCONVOLUTION_OUTPUTSTAGE_KERNEL_H */