COMPMID-1767: NEON: Implement Where/Select

Change-Id: If8a1ab6d6a029a5c547b726e0692eecef9a2e97d
Reviewed-on: https://review.mlplatform.org/415
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>

1 files changed, 102 insertions, 0 deletions

diff --git a/arm_compute/core/NEON/kernels/NESelectKernel.h b/arm_compute/core/NEON/kernels/NESelectKernel.h
new file mode 100644
index 0000000000..215dc2f5ee
--- /dev/null
+++ b/arm_compute/core/NEON/kernels/NESelectKernel.h
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2018 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, INNEUDING 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 NEAIM, 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_NESELECTKERNEL_H__
+#define __ARM_COMPUTE_NESELECTKERNEL_H__
+
+#include "arm_compute/core/NEON/INEKernel.h"
+#include "arm_compute/core/Types.h"
+
+namespace arm_compute
+{
+class ITensor;
+
+/** Interface for the select kernel
+ *
+ * Select is computed by:
+ * @f[ output(i) = condition(i) ? x(i) : y(i) @f]
+ *
+ */
+class NESelectKernel : public INEKernel
+{
+public:
+    const char *name() const override
+    {
+        return "NESelectKernel";
+    }
+    /** Default constructor */
+    NESelectKernel();
+    /** Prevent instances of this class from being copied (As this class contains pointers) */
+    NESelectKernel(const NESelectKernel &) = delete;
+    /** Prevent instances of this class from being copied (As this class contains pointers) */
+    NESelectKernel &operator=(const NESelectKernel &) = delete;
+    /** Allow instances of this class to be moved */
+    NESelectKernel(NESelectKernel &&) = default;
+    /** Allow instances of this class to be moved */
+    NESelectKernel &operator=(NESelectKernel &&) = default;
+    /** Default destructor */
+    ~NESelectKernel() = default;
+
+    /** Common signature for all the specialised elementwise functions
+     *
+     * @param[in]  c      Condition input tensor. Data types supported: U8.
+     * @param[in]  x      First input tensor. Data types supported: U8/S8/U16/S16/U32/S32/F16/F32.
+     * @param[out] y      Second input tensor. Data types supported: Same as @p x
+     * @param[in]  output Output tensor. Data types supported: Same as @p x
+     */
+    void configure(const ITensor *c, const ITensor *x, const ITensor *y, ITensor *output);
+
+    /** Validate the argument passed to the kernel
+     *
+     * @param[in] c      Condition input tensor. Data types supported: U8.
+     * @param[in] x      First input tensor. Data types supported: U8/S8/U16/S16/U32/S32/F16/F32.
+     * @param[in] y      Second input tensor. Data types supported: Same as @p x
+     * @param[in] output Output tensor. Data types supported: Same as @p x.
+     *
+     * @return a status
+     */
+    static Status validate(const ITensorInfo *c, const ITensorInfo *x, const ITensorInfo *y, const ITensorInfo *output);
+
+    // Inherited methods overridden:
+    void run(const Window &window, const ThreadInfo &info) override;
+
+private:
+    /** Common signature for all the specialised select functions
+     *
+     * @param[in] c      Condition input tensor. Data types supported: U8.
+     * @param[in] x      First input tensor. Data types supported: U8/S8/U16/S16/U32/S32/F16/F32.
+     * @param[in] y      Second input tensor. Data types supported: Same as @p x
+     * @param[in] output Output tensor. Data types supported: Same as @p x.
+     */
+    using SelectFunction = void(const ITensor *c, const ITensor *x, const ITensor *y, ITensor *output, const Window &window);
+
+    /** Select function to use for the particular tensor types passed to configure() */
+    SelectFunction *_function;
+    const ITensor *_c;              /**< Condition tensor */
+    const ITensor *_x;              /**< Source tensor 1 */
+    const ITensor *_y;              /**< Source tensor 2 */
+    ITensor        *_output;        /**< Destination tensor */
+    bool            _has_same_rank; /**< Flag that indicates if condition tensor and other inputs have the same rank */
+};
+} // namespace arm_compute
+#endif /* __ARM_COMPUTE_NESELECTKERNEL_H__ */