COMPMID-1756: NEON: Implement RSqrt, Exp

Change-Id: I6b140b8868b04f7d3032a51831a80829e8e1560e
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/165590
Tested-by: bsgcomp <bsgcomp@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
Reviewed-on: https://review.mlplatform.org/470
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>

1 files changed, 100 insertions, 0 deletions

diff --git a/arm_compute/core/NEON/kernels/NEElementwiseUnaryKernel.h b/arm_compute/core/NEON/kernels/NEElementwiseUnaryKernel.h
new file mode 100644
index 0000000000..f632b1a93a
--- /dev/null
+++ b/arm_compute/core/NEON/kernels/NEElementwiseUnaryKernel.h
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2018-2019 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_NEELEMENTWISEUNARYKERNEL_H__
+#define __ARM_COMPUTE_NEELEMENTWISEUNARYKERNEL_H__
+
+#include "arm_compute/core/NEON/INEKernel.h"
+#include "arm_compute/core/Types.h"
+
+namespace arm_compute
+{
+class ITensor;
+
+/** Interface for an element-wise unary operation kernel
+ *
+ * Element-wise operation is computed by:
+ * @f[ output(x) = OP(input(x))@f]
+ *
+ */
+class NEElementwiseUnaryKernel : public INEKernel
+{
+public:
+    const char *name() const override
+    {
+        return "NEElementwiseUnaryKernel";
+    }
+    /** Default constructor */
+    NEElementwiseUnaryKernel();
+    /** Prevent instances of this class from being copied (As this class contains pointers) */
+    NEElementwiseUnaryKernel(const NEElementwiseUnaryKernel &) = delete;
+    /** Prevent instances of this class from being copied (As this class contains pointers) */
+    NEElementwiseUnaryKernel &operator=(const NEElementwiseUnaryKernel &) = delete;
+    /** Allow instances of this class to be moved */
+    NEElementwiseUnaryKernel(NEElementwiseUnaryKernel &&) = default;
+    /** Allow instances of this class to be moved */
+    NEElementwiseUnaryKernel &operator=(NEElementwiseUnaryKernel &&) = default;
+    /** Default destructor */
+    ~NEElementwiseUnaryKernel() = default;
+
+    /** Static function to check if given info will lead to a valid configuration of @ref NEElementwiseUnaryKernel
+     *
+     * @param[in] op     Arithmetic operation to be executed.
+     * @param[in] input  First tensor input. Data types supported: F16/F32.
+     * @param[in] output Output tensor. Data types supported: Same as @p input.
+     */
+    void configure(ElementWiseUnary op, const ITensor *input, ITensor *output);
+
+    /** Static function to check if given info will lead to a valid configuration of @ref NEElementwiseUnaryKernel
+     *
+     * @param[in] op     Arithmetic operation to be executed.
+     * @param[in] input  First tensor input info. Data types supported: F16/F32.
+     * @param[in] output Output tensor info. Data types supported: Same as @p input.
+     *
+     * @return a Status
+     */
+    static Status validate(ElementWiseUnary op, const ITensorInfo *input, const ITensorInfo *output);
+
+    // Inherited methods overridden:
+    void run(const Window &window, const ThreadInfo &info) override;
+
+    /** Common signature for all the specialised arithmetic functions
+     *
+     * @param[in]  input  An input tensor. Data types supported: F16/F32.
+     * @param[out] output The output tensor. Data types supported: F16/F32.
+     * @param[in]  window Region on which to execute the kernel.
+     */
+    using ElementwiseUnaryFunction = void(const ITensor *input, ITensor *output, const Window &window);
+
+protected:
+    // Inherited methods overridden:
+    static Status validate_arguments(const ITensorInfo &input, const ITensorInfo &output);
+
+    /** Function to use for the particular tensor types passed to configure() */
+    std::function<void(const ITensor *input, ITensor *output, const Window &window)> _function;
+
+    const ITensor *_input;
+    ITensor       *_output;
+};
+} // namespace arm_compute
+#endif /* __ARM_COMPUTE_NEELEMENTWISEUNARYKERNEL_H__ */