ScaleUtils.cpp

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/*
 * Copyright (c) 2020, 2022 Arm Limited.
 *
 * SPDX-License-Identifier: MIT
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 * 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.
 *
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#include "src/core/utils/ScaleUtils.h"
#include "src/common/cpuinfo/CpuIsaInfo.h"

#include "arm_compute/core/CPP/CPPTypes.h"
#include "arm_compute/core/TensorInfo.h"

float arm_compute::scale_utils::calculate_resize_ratio(size_t input_size, size_t output_size, bool align_corners)
{
    const size_t offset = (align_corners && output_size > 1) ? 1 : 0;
    const auto   in     = input_size - offset;
    const auto   out    = output_size - offset;

    ARM_COMPUTE_ERROR_ON((input_size == 0 || output_size == 0) && offset == 1);
    ARM_COMPUTE_ERROR_ON(out == 0);

    return static_cast<float>(in) / static_cast<float>(out);
}

bool arm_compute::scale_utils::is_precomputation_required(DataLayout data_layout, DataType data_type,
                                                          InterpolationPolicy policy, BorderMode border_mode)
{
    // Do not calculate precomputed weights and indices if kernel code doesn't use them
    if(data_layout == DataLayout::NHWC)
    {
        switch(data_type)
        {
            case DataType::F32:
            case DataType::F16:
                return (CPUInfo::get().get_isa().sve == true && policy == InterpolationPolicy::NEAREST_NEIGHBOR);
            case DataType::U8:
            case DataType::S8:
            case DataType::QASYMM8:
            case DataType::QASYMM8_SIGNED:
                return (border_mode != BorderMode::REPLICATE) || (policy == InterpolationPolicy::NEAREST_NEIGHBOR);
            default:
                return true;
        }
    }

    return true;
}