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/*
* Copyright (c) 2018-2020 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"
/** Perform a strided slice operation on a given input.
*
* @attention Supported tensor rank: up to 4
*
* @attention Data type can be passed using the -DDATA_TYPE compile flag, e.g. -DDATA_TYPE=float
* @attention Input and output tensor dephts should be given as a preprocessor arguments using -DSRC_DEPTH=size. and -DDST_DEPTH=size
* @attention Absolute start coordinates for each dimension should be given as preprocessor -DSTART_index=value e.g. -DSTART_0=2
* @attention Strides for each dimension should be given as preprocessor -DSTRIDE_index=value e.g. -DSTRIDE_1=1
*
* @param[in] input_ptr Pointer to the source tensor. Supported data types: All
* @param[in] input_stride_x Stride of the source tensor in X dimension (in bytes)
* @param[in] input_step_x input_stride_x * number of elements along X processed per workitem(in bytes)
* @param[in] input_stride_y Stride of the source tensor in Y dimension (in bytes)
* @param[in] input_step_y input_stride_y * number of elements along Y processed per workitem(in bytes)
* @param[in] input_stride_z Stride of the source tensor in Z dimension (in bytes)
* @param[in] input_step_z input_stride_z * number of elements along Z processed per workitem(in bytes)
* @param[in] input_stride_w Stride of the source tensor in W dimension (in bytes)
* @param[in] input_step_w input_stride_w * number of elements along W processed per workitem(in bytes)
* @param[in] input_offset_first_element_in_bytes The offset of the first element in the source tensor
* @param[out] output_ptr Pointer to the destination tensor. Supported data types: same as @p input_ptr
* @param[in] output_stride_x Stride of the destination tensor in X dimension (in bytes)
* @param[in] output_step_x output_stride_x * number of elements along X processed per workitem(in bytes)
* @param[in] output_stride_y Stride of the destination tensor in Y dimension (in bytes)
* @param[in] output_step_y output_stride_y * number of elements along Y processed per workitem(in bytes)
* @param[in] output_stride_z Stride of the destination tensor in Z dimension (in bytes)
* @param[in] output_step_z output_stride_z * number of elements along Z processed per workitem(in bytes)
* @param[in] output_stride_w Stride of the destination tensor in W dimension (in bytes)
* @param[in] output_step_w output_stride_w * number of elements along W processed per workitem(in bytes)
* @param[in] output_offset_first_element_in_bytes The offset of the first element in the destination tensor
*/
__kernel void strided_slice(
TENSOR4D_DECLARATION(input),
TENSOR4D_DECLARATION(output))
{
// Get pixels pointer
Tensor4D input = CONVERT_TO_TENSOR4D_STRUCT_NO_STEP(input, SRC_DEPTH);
Tensor4D output = CONVERT_TO_TENSOR4D_STRUCT(output, DST_DEPTH);
int offset = 0;
// Offset X
#if defined(SHRINK_0)
input.ptr += (int)START_0 * input_stride_x;
#elif defined(START_0) && defined(STRIDE_0) && defined(VEC_SIZE) && defined(LAST_ACCESSED_X)
// Check if access on width gets out of bounds
// If it does shift access vector to access elements within bounds
const int xi = (int)(get_global_id(0) * VEC_SIZE);
offset = (int)START_0 + min(xi, (int)LAST_ACCESSED_X);
input.ptr += offset * input_stride_x;
output.ptr -= max(xi - (int)LAST_ACCESSED_X, 0) * output_stride_x;
#elif defined(START_0) && defined(STRIDE_0)
offset = (int)START_0 + (int)get_global_id(0) * (int)STRIDE_0;
input.ptr += offset * input_stride_x;
#endif // defined(START_0) && defined(STRIDE_0)
// Offset Y
#if defined(SHRINK_1)
input.ptr += (int)START_1 * input_stride_y;
#elif defined(START_1) && defined(STRIDE_1)
#if defined(SHRINK_0)
offset = (int)START_1 + (int)get_global_id(0) * (int)STRIDE_1;
#else // defined(SHRINK_0)
offset = (int)START_1 + (int)get_global_id(1) * (int)STRIDE_1;
#endif // defined(SHRINK_0)
input.ptr += offset * input_stride_y;
#endif // defined(START_1) && defined(STRIDE_1)
// Offset Z
#if defined(SHRINK_2)
input.ptr += (int)START_2 * input_stride_z;
#elif defined(START_2) && defined(STRIDE_2)
#if defined(SHRINK_1) && defined(SHRINK_0)
offset = (int)START_2 + (int)get_global_id(0) * (int)STRIDE_2;
#elif defined(SHRINK_1) || defined(SHRINK_0)
offset = (int)START_2 + (int)get_global_id(1) * (int)STRIDE_2;
#else // defined(SHRINK_1) && defined(SHRINK_0)
offset = (int)START_2 + ((int)get_global_id(2) % (int)DST_DEPTH) * (int)STRIDE_2;
#endif // defined(SHRINK_1) && defined(SHRINK_0)
input.ptr += offset * input_stride_z;
#endif // defined(START_2) && defined(STRIDE_2)
// Offset depth
#if defined(SHRINK_3)
input.ptr += (int)START_3 * input_stride_w;
#elif defined(START_3) && defined(STRIDE_3)
#if defined(SHRINK_2) && defined(SHRINK_1) && defined(SHRINK_0)
offset = (int)START_3 + (int)get_global_id(0) * (int)STRIDE_3;
#elif !defined(SHRINK_2) && !defined(SHRINK_1) && !defined(SHRINK_0)
offset = (int)START_3 + ((int)get_global_id(2) / (int)DST_DEPTH) * (int)STRIDE_3;
#elif(defined(SHRINK_0) && defined(SHRINK_1)) || (defined(SHRINK_1) && defined(SHRINK_2)) || (defined(SHRINK_0) && defined(SHRINK_2))
offset = (int)START_3 + (int)get_global_id(1) * (int)STRIDE_3;
#else // defined(SHRINK_2) && defined(SHRINK_1) && defined(SHRINK_0)
offset = (int)START_3 + ((int)get_global_id(2) % (int)DST_DEPTH) * (int)STRIDE_3;
#endif // defined(SHRINK_2) && defined(SHRINK_1) && defined(SHRINK_0)
input.ptr += offset * input_stride_w;
#endif // defined(START_3) && defined(STRIDE_3)
// Store result
#if defined(VEC_SIZE) && defined(LAST_ACCESSED_X)
VEC_DATA_TYPE(DATA_TYPE, VEC_SIZE)
val = VLOAD(VEC_SIZE)(0, (__global DATA_TYPE *)(input.ptr));
VSTORE(VEC_SIZE)
(val, 0, (__global DATA_TYPE *)(output.ptr));
#else // defined(VEC_SIZE) && defined(LAST_ACCESSED_X)
*((__global DATA_TYPE *)(output.ptr)) = *((__global DATA_TYPE *)(input.ptr));
#endif // defined(VEC_SIZE) && defined(LAST_ACCESSED_X)
}
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