COMPMID-344 Updated doxygen
Change-Id: I32f7b84daa560e460b77216add529c8fa8b327ae
diff --git a/src/core/NEON/kernels/NEGaussian3x3Kernel.cpp b/src/core/NEON/kernels/NEGaussian3x3Kernel.cpp
new file mode 100644
index 0000000..419f482
--- /dev/null
+++ b/src/core/NEON/kernels/NEGaussian3x3Kernel.cpp
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2016, 2017 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.
+ */
+#include "arm_compute/core/NEON/kernels/NEGaussian3x3Kernel.h"
+
+#include "arm_compute/core/Coordinates.h"
+#include "arm_compute/core/Helpers.h"
+#include "arm_compute/core/ITensor.h"
+#include "arm_compute/core/NEON/INEKernel.h"
+#include "arm_compute/core/Validate.h"
+
+#include <arm_neon.h>
+
+using namespace arm_compute;
+
+BorderSize NEGaussian3x3Kernel::border_size() const
+{
+ return BorderSize(1);
+}
+
+void NEGaussian3x3Kernel::configure(const ITensor *input, ITensor *output, bool border_undefined)
+{
+ ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(input, 1, DataType::U8);
+ ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(output, 1, DataType::U8);
+
+ _input = input;
+ _output = output;
+
+ // Configure kernel window
+ constexpr unsigned int num_elems_processed_per_iteration = 8;
+ constexpr unsigned int num_elems_read_per_iteration = 16;
+ constexpr unsigned int num_elems_written_per_iteration = 8;
+ constexpr unsigned int num_rows_read_per_iteration = 3;
+
+ Window win = calculate_max_window(*input->info(), Steps(num_elems_processed_per_iteration), border_undefined, border_size());
+ AccessWindowHorizontal output_access(output->info(), 0, num_elems_written_per_iteration);
+
+ update_window_and_padding(win,
+ AccessWindowRectangle(input->info(), -border_size().left, -border_size().top, num_elems_read_per_iteration, num_rows_read_per_iteration),
+ output_access);
+
+ output_access.set_valid_region(win, input->info()->valid_region(), border_undefined, border_size());
+
+ INEKernel::configure(win);
+}
+
+void NEGaussian3x3Kernel::run(const Window &window)
+{
+ ARM_COMPUTE_ERROR_ON_UNCONFIGURED_KERNEL(this);
+ ARM_COMPUTE_ERROR_ON_INVALID_SUBWINDOW(INESimpleKernel::window(), window);
+
+ Iterator input(_input, window);
+ Iterator output(_output, window);
+
+ const uint8_t *input_bot_ptr = _input->ptr_to_element(Coordinates(-1, -1));
+ const uint8_t *input_mid_ptr = _input->ptr_to_element(Coordinates(-1, 0));
+ const uint8_t *input_top_ptr = _input->ptr_to_element(Coordinates(-1, +1));
+
+ static const int16x8_t two = vdupq_n_s16(2);
+ static const int16x8_t four = vdupq_n_s16(4);
+
+ execute_window_loop(window, [&](const Coordinates & id)
+ {
+ uint8x16_t top_data = vld1q_u8(input_top_ptr + input.offset());
+ uint8x16_t mid_data = vld1q_u8(input_mid_ptr + input.offset());
+ uint8x16_t bot_data = vld1q_u8(input_bot_ptr + input.offset());
+
+ const int16x8x2_t top_s16 =
+ {
+ {
+ vreinterpretq_s16_u16(vmovl_u8(vget_low_u8(top_data))),
+ vreinterpretq_s16_u16(vmovl_u8(vget_high_u8(top_data)))
+ }
+ };
+ const int16x8x2_t mid_s16 =
+ {
+ {
+ vreinterpretq_s16_u16(vmovl_u8(vget_low_u8(mid_data))),
+ vreinterpretq_s16_u16(vmovl_u8(vget_high_u8(mid_data)))
+ }
+ };
+ const int16x8x2_t bot_s16 =
+ {
+ {
+ vreinterpretq_s16_u16(vmovl_u8(vget_low_u8(bot_data))),
+ vreinterpretq_s16_u16(vmovl_u8(vget_high_u8(bot_data)))
+ }
+ };
+
+ //top left
+ int16x8_t out = top_s16.val[0];
+ //top mid
+ out = vmlaq_s16(out, vextq_s16(top_s16.val[0], top_s16.val[1], 1), two);
+ //top right
+ out = vaddq_s16(out, vextq_s16(top_s16.val[0], top_s16.val[1], 2));
+ //mid left
+ out = vmlaq_s16(out, mid_s16.val[0], two);
+ //mid mid
+ out = vmlaq_s16(out, vextq_s16(mid_s16.val[0], mid_s16.val[1], 1), four);
+ //mid right
+ out = vmlaq_s16(out, vextq_s16(mid_s16.val[0], mid_s16.val[1], 2), two);
+ //bot left
+ out = vaddq_s16(out, bot_s16.val[0]);
+ //bot mid
+ out = vmlaq_s16(out, vextq_s16(bot_s16.val[0], bot_s16.val[1], 1), two);
+ //bot right
+ out = vaddq_s16(out, vextq_s16(bot_s16.val[0], bot_s16.val[1], 2));
+
+ vst1_u8(output.ptr(), vqshrun_n_s16(out, 4));
+ },
+ input, output);
+}