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Diffstat (limited to 'src/core/NEON/kernels/NEIntegralImageKernel.cpp')
| -rw-r--r-- | src/core/NEON/kernels/NEIntegralImageKernel.cpp | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/src/core/NEON/kernels/NEIntegralImageKernel.cpp b/src/core/NEON/kernels/NEIntegralImageKernel.cpp new file mode 100644 index 0000000000..3b09a1bdbb --- /dev/null +++ b/src/core/NEON/kernels/NEIntegralImageKernel.cpp @@ -0,0 +1,141 @@ +/* + * 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/NEIntegralImageKernel.h" + +#include "arm_compute/core/Coordinates.h" +#include "arm_compute/core/Helpers.h" +#include "arm_compute/core/ITensor.h" +#include "arm_compute/core/Types.h" +#include "arm_compute/core/Validate.h" + +#include <arm_neon.h> +#include <cstddef> +#include <cstdint> + +using namespace arm_compute; + +void NEIntegralImageKernel::configure(const ITensor *input, ITensor *output) +{ + 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::U32); + + _input = input; + _output = output; + + constexpr unsigned int num_elems_processed_per_iteration = 16; + + // Configure kernel window + Window win = calculate_max_window(*input->info(), Steps(num_elems_processed_per_iteration)); + // The kernel is effectively reading 17 values from -1 as it loads 16 + // starting at -1 and also 16 starting at 0 + AccessWindowRectangle output_read_access(output->info(), -1, -1, num_elems_processed_per_iteration + 1, 1); + AccessWindowHorizontal output_write_access(output->info(), 0, num_elems_processed_per_iteration); + + update_window_and_padding(win, + AccessWindowHorizontal(input->info(), 0, num_elems_processed_per_iteration), + output_read_access, output_write_access); + + output_write_access.set_valid_region(win, input->info()->valid_region()); + + IKernel::configure(win); +} + +BorderSize NEIntegralImageKernel::border_size() const +{ + return BorderSize(1, 0, 0, 1); +} + +bool NEIntegralImageKernel::is_parallelisable() const +{ + return false; +} + +void NEIntegralImageKernel::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 auto output_top_left = reinterpret_cast<const uint32_t *>(_output->ptr_to_element(Coordinates(-1, -1))); + const auto output_top_mid = reinterpret_cast<const uint32_t *>(_output->ptr_to_element(Coordinates(0, -1))); + + execute_window_loop(window, [&](const Coordinates & id) + { + const uint8x16_t input_pixels = vld1q_u8(input.ptr()); + + const uint16x8x2_t tmp = + { + { + vmovl_u8(vget_low_u8(input_pixels)), + vmovl_u8(vget_high_u8(input_pixels)) + } + }; + + uint32x4x4_t pixels = + { + { + vmovl_u16(vget_low_u16(tmp.val[0])), + vmovl_u16(vget_high_u16(tmp.val[0])), + vmovl_u16(vget_low_u16(tmp.val[1])), + vmovl_u16(vget_high_u16(tmp.val[1])) + } + }; + + // Divide by four as pointer is now uint32 instead of uint8! + const size_t off = output.offset() / 4; + + // Add top mid pixel values + const uint32_t *const top_mid_ptr = output_top_mid + off; + + pixels.val[0] = vaddq_u32(vld1q_u32(top_mid_ptr), pixels.val[0]); + pixels.val[1] = vaddq_u32(vld1q_u32(top_mid_ptr + 4), pixels.val[1]); + pixels.val[2] = vaddq_u32(vld1q_u32(top_mid_ptr + 8), pixels.val[2]); + pixels.val[3] = vaddq_u32(vld1q_u32(top_mid_ptr + 12), pixels.val[3]); + + // Subtract top left diagonal values + const auto outptr = reinterpret_cast<uint32_t *>(output.ptr()); + const uint32_t *const top_left_ptr = output_top_left + off; + + pixels.val[0] = vsubq_u32(pixels.val[0], vld1q_u32(top_left_ptr)); + vst1q_u32(outptr, pixels.val[0]); + + pixels.val[1] = vsubq_u32(pixels.val[1], vld1q_u32(top_left_ptr + 4)); + vst1q_u32(outptr + 4, pixels.val[1]); + + pixels.val[2] = vsubq_u32(pixels.val[2], vld1q_u32(top_left_ptr + 8)); + vst1q_u32(outptr + 8, pixels.val[2]); + + pixels.val[3] = vsubq_u32(pixels.val[3], vld1q_u32(top_left_ptr + 12)); + vst1q_u32(outptr + 12, pixels.val[3]); + + // Perform prefix summation + for(auto i = 0; i < 16; ++i) + { + outptr[i] += outptr[i - 1]; + } + }, + input, output); +} |