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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_QUANTIZATION_ASYMM_HELPERS_H__
#define __ARM_COMPUTE_QUANTIZATION_ASYMM_HELPERS_H__
#include "arm_compute/core/Error.h"
#include "arm_compute/core/ITensor.h"
#include "arm_compute/core/Types.h"
namespace arm_compute
{
namespace quantization
{
/** Calculate quantized representation of multiplier.
*
* @param[in] multiplier Real multiplier.
* @param[out] quant_multiplier Integer multiplier.
* @param[out] shift bit shift. A negative value indicates a left shift, while a positive value indicates a right shift
*
* @return a status
*/
Status calculate_quantized_multiplier(float multiplier, int *quant_multiplier, int *shift);
/** Calculate quantized representation of multiplier with value less than one.
*
* @param[in] multiplier Real multiplier.
* @param[out] quant_multiplier Integer multiplier.
* @param[out] right_shift Right bit shift.
*
* @return a status
*/
Status calculate_quantized_multiplier_less_than_one(float multiplier, int *quant_multiplier, int *right_shift);
/** Calculate quantized representation of multiplier having value greater than one.
*
* @param[in] multiplier Real multiplier.
* @param[out] quantized_multiplier Integer multiplier.
* @param[out] left_shift Left bit shift.
*
* @return a status
*/
Status calculate_quantized_multiplier_greater_than_one(float multiplier, int *quantized_multiplier, int *left_shift);
/** Get minimum and maximum values for the input quantized data type
*
* @return min and max values for the quantized data type
*/
std::pair<int, int> get_min_max_values_from_quantized_data_type(DataType data_type);
/** Compute quantized per-channel multipliers and shifts. As many multipliers
* and shifts as output channels are computed. If weights are not quantized
* per-channel, multipliers and shifts will end up being the same for each
* channel.
*
* @param[in] input Input tensor.
* @param[in] weights Weights tensor.
* @param[in] output Output tensor.
* @param[out] output_multipliers_ptr Pointer to the buffer where to store per-channel multipliers.
* @param[out] output_shifts_ptr Pointer to the buffer where to store per-channel shifts.
*
* @return min and max values for the quantized data type
*/
void compute_quantized_multipliers_and_shifts(const ITensor *input, const ITensor *weights, const ITensor *output, int32_t *output_multipliers_ptr, int32_t *output_shifts_ptr);
} // namespace quantization
} // namespace arm_compute
#endif /* __ARM_COMPUTE_IO_FILE_HANDLER_H__ */
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