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/*
* Copyright (c) 2016-2018 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, 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 "helpers.h"
#pragma OPENCL EXTENSION cl_khr_int64_base_atomics : enable
/** This function calculates the sum and sum of squares of a given input image.
*
* @note To enable calculation sum of squares -DSTDDEV should be passed as a preprocessor argument.
*
* @param[in] src_ptr Pointer to the source image. Supported data types: U8
* @param[in] src_stride_x Stride of the source image in X dimension (in bytes)
* @param[in] src_step_x src_stride_x * number of elements along X processed per workitem(in bytes)
* @param[in] src_stride_y Stride of the source image in Y dimension (in bytes)
* @param[in] src_step_y src_stride_y * number of elements along Y processed per workitem(in bytes)
* @param[in] src_offset_first_element_in_bytes The offset of the first element in the source image
* @param[in] height Height of the input image
* @param[out] global_sum Global sum of all elements
* @param[out] global_sum_sq Global sum of squares of all elements
*/
__kernel void mean_stddev_accumulate(
IMAGE_DECLARATION(src),
uint height,
__global ulong *global_sum
#ifdef STDDEV
,
__global ulong *global_sum_sq
#endif /* STDDEV */
)
{
// Get pixels pointer
Image src = CONVERT_TO_IMAGE_STRUCT(src);
uint8 tmp_sum = 0;
#ifdef STDDEV
uint8 tmp_sum_sq = 0;
#endif /* STDDEV */
// Calculate partial sum
for(int i = 0; i < height; i++)
{
// Load data
uint8 data = convert_uint8(vload8(0, offset(&src, 0, i)));
tmp_sum += data;
#ifdef STDDEV
tmp_sum_sq += data * data;
#endif /* STDDEV */
}
// Perform reduction
tmp_sum.s0123 += tmp_sum.s4567;
tmp_sum.s01 += tmp_sum.s23;
atom_add(global_sum, tmp_sum.s0 + tmp_sum.s1);
#ifdef STDDEV
tmp_sum_sq.s0123 += tmp_sum_sq.s4567;
tmp_sum_sq.s01 += tmp_sum_sq.s23;
atom_add(global_sum_sq, tmp_sum_sq.s0 + tmp_sum_sq.s1);
#endif /* STDDEV */
}
#pragma OPENCL EXTENSION cl_khr_int64_base_atomics : disable
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