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/*
* Copyright (c) 2016-2019 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.
*/
#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, const ThreadInfo &info)
{
ARM_COMPUTE_UNUSED(info);
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 &)
{
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);
}
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