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/*
* Copyright (c) 2017-2019 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.
*/
#ifndef ARM_COMPUTE_IACCESS_WINDOW_H
#define ARM_COMPUTE_IACCESS_WINDOW_H
#include "arm_compute/core/Coordinates.h"
#include "arm_compute/core/TensorShape.h"
#include "arm_compute/core/Types.h"
#include <array>
namespace arm_compute
{
class Window;
class ITensorInfo;
/** Decrease @p required in steps of @p step until it's less than @p available.
*
* @param[in] required Number of required bytes.
* @param[in] available Number of available bytes.
* @param[in] step Step size used to decrease required bytes.
*
* @return Largest value smaller than @p available that is a multiple of @p step
*
**/
inline int adjust_down(int required, int available, int step)
{
ARM_COMPUTE_ERROR_ON(step <= 0);
return required - step * ((required - available + step - 1) / step);
}
/** Increase @p required in steps of @p step until it's greater than @p available.
*
* @param[in] required Number of required bytes.
* @param[in] available Number of available bytes.
* @param[in] step Step size used to increase required bytes.
*
* @return Largest value smaller than @p available that is a multiple of @p step
*
**/
inline int adjust_up(int required, int available, int step)
{
ARM_COMPUTE_ERROR_ON(step <= 0);
return required + step * ((available - required + step - 1) / step);
}
/** Interface describing methods to update access window and padding based on kernel parameters. */
class IAccessWindow
{
public:
/** Default virtual destructor */
virtual ~IAccessWindow() = default;
/** Shrink the window if padding is not large enough.
*
* @param[in] window Window used by the kernel.
*
* @return True if the window has been changed.
*
*/
virtual bool update_window_if_needed(Window &window) const = 0;
/** Increase the padding to be large enough for the window.
*
* @param[in] window Window used by the kernel.
*
* @return True if the padding has been changed.
*/
virtual bool update_padding_if_needed(const Window &window) = 0;
/** Compute the valid region based on access pattern and valid region of the inputs.
*
* @note This method assumes that there is no border.
*
* @param[in] window Execution window of the kernel.
* @param[in] input_valid_region Combined valid region of all inputs.
* @param[in] border_undefined Undefined borders are excluded from the valid region.
* @param[in] border_size Size of the border around the XY-plane of the tensor.
*
* @return a valid region.
*
*/
virtual ValidRegion compute_valid_region(const Window &window,
ValidRegion input_valid_region,
bool border_undefined,
BorderSize border_size) const = 0;
};
/** Implementation of a rectangular access pattern. */
class AccessWindowRectangle : public IAccessWindow
{
public:
/** Constructor for a rectangular access pattern.
*
* @note Width and height have to be non-negative.
*
* @param[in,out] info Tensor info of the accessed kernel.
* @param[in] x Offset of the access in X direction.
* @param[in] y Offset of the access in Y direction.
* @param[in] width Number of elements that are accessed in X direction.
* @param[in] height Number of elements that are accessed in Y direction.
*/
AccessWindowRectangle(ITensorInfo *info, int x, int y, int width, int height)
: AccessWindowRectangle(info, x, y, width, height, 1.f, 1.f)
{
}
/** Constructor for a rectangular access pattern.
*
* @note Width, height and scale have to be non-negative.
*
* @param[in,out] info Tensor info of the accessed kernel.
* @param[in] x Offset of the access in X direction.
* @param[in] y Offset of the access in Y direction.
* @param[in] width Number of elements that are accessed in X direction.
* @param[in] height Number of elements that are accessed in Y direction.
* @param[in] scale_x Ratio along the X direction between the window used by the execute_window_loop and the rectangular access pattern defined
* @param[in] scale_y Ratio along the Y direction between the window used by the execute_window_loop and the rectangular access pattern defined
*/
AccessWindowRectangle(ITensorInfo *info, int x, int y, int width, int height, float scale_x, float scale_y)
: _info(info), _x(x), _y(y), _width(width), _height(height), _scale_x(scale_x), _scale_y(scale_y)
{
ARM_COMPUTE_ERROR_ON(width < 0);
ARM_COMPUTE_ERROR_ON(height < 0);
ARM_COMPUTE_ERROR_ON(scale_x < 0);
ARM_COMPUTE_ERROR_ON(scale_y < 0);
}
/** Prevent instances of this class from being copied (As this class contains pointers) */
AccessWindowRectangle(const AccessWindowRectangle &) = delete;
/** Allow instances of this class to be move constructed */
AccessWindowRectangle(AccessWindowRectangle &&) = default;
/** Prevent instances of this class from being copied (As this class contains pointers) */
AccessWindowRectangle &operator=(const AccessWindowRectangle &) = delete;
/** Allow instances of this class to be moved */
AccessWindowRectangle &operator=(AccessWindowRectangle &&) = default;
/** Default destructor */
~AccessWindowRectangle() = default;
/** Set the valid region based on access pattern, valid region of the inputs and border mode.
*
* @param[in] window Execution window of the kernel.
* @param[in] input_valid_region Combined valid region of all inputs.
* @param[in] border_undefined (Optional) Undefined borders are excluded from the valid region.
* @param[in] border_size (Optional) Size of the border around the XY-plane of the tensor.
*/
void set_valid_region(const Window &window,
const ValidRegion &input_valid_region,
bool border_undefined = false,
const BorderSize &border_size = BorderSize(0));
/** Compute the valid region based on access pattern, valid region of the inputs and border mode.
*
* @note This method assumes that there is no border.
*
* @param[in] window Execution window of the kernel.
* @param[in] input_valid_region Combined valid region of all inputs.
*
* @return a valid region.
*
*/
ValidRegion compute_valid_region(const Window &window, const ValidRegion &input_valid_region) const;
// Inherited methods overridden:
/** Compute the valid region based on access pattern and valid region of the inputs.
*
* @note This method assumes that all elements written by the kernel are valid.
*
* @param[in] window Execution window of the kernel.
* @param[in] input_valid_region Combined valid region of all inputs.
* @param[in] border_undefined Undefined borders are excluded from the valid region.
* @param[in] border_size Size of the border around the XY-plane of the tensor.
*
* @return a valid region.
*
*/
ValidRegion compute_valid_region(const Window &window,
ValidRegion input_valid_region,
bool border_undefined,
BorderSize border_size) const override;
bool update_window_if_needed(Window &window) const override;
bool update_padding_if_needed(const Window &window) override;
protected:
PaddingSize get_needed_padding(const Window &window) const;
protected:
ITensorInfo *_info;
int _x;
int _y;
int _width;
int _height;
float _scale_x;
float _scale_y;
};
/** Implementation of a column access pattern. */
class AccessWindowVertical : public AccessWindowRectangle
{
public:
/** Constructor for a column access pattern.
*
* @note Height has to be non-negative.
*
* @param[in,out] info Tensor info of the accessed kernel.
* @param[in] y Offset of the access in Y direction.
* @param[in] height Number of elements that are accessed in Y direction.
* @param[in] scale_y Ratio along the Y direction between the window used by the execute_window_loop and the rectangular access pattern defined
*/
AccessWindowVertical(ITensorInfo *info, int y, int height, float scale_y = 1.f)
: AccessWindowRectangle(info, 0, y, 1, height, 1.f, scale_y)
{
ARM_COMPUTE_ERROR_ON(height < 0);
ARM_COMPUTE_ERROR_ON(scale_y < 0);
}
};
/** Implementation of a row access pattern. */
class AccessWindowHorizontal : public AccessWindowRectangle
{
public:
/** Constructor for a row access pattern.
*
* @note Width has to be non-negative.
*
* @param[in,out] info Tensor info of the accessed kernel.
* @param[in] x Offset of the access in X direction.
* @param[in] width Number of elements that are accessed in X direction.
* @param[in] scale_x Ratio along the X direction between the window used by the execute_window_loop and the rectangular access pattern defined
*/
AccessWindowHorizontal(ITensorInfo *info, int x, int width, float scale_x = 1.f)
: AccessWindowRectangle(info, x, 0, width, 1, scale_x, 1.f)
{
ARM_COMPUTE_ERROR_ON(width < 0);
ARM_COMPUTE_ERROR_ON(scale_x < 0);
}
};
} // namespace arm_compute
#endif /*ARM_COMPUTE_IACCESS_WINDOW_H*/
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