/*
 * Copyright (c) 2017 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 "arm_compute/core/NEON/kernels/NEDirectConvolutionLayerBiasAccumulateKernel.h"

#include "arm_compute/core/AccessWindowStatic.h"
#include "arm_compute/core/Error.h"
#include "arm_compute/core/Helpers.h"
#include "arm_compute/core/ITensor.h"
#include "arm_compute/core/NEON/NEFixedPoint.h"
#include "arm_compute/core/Types.h"
#include "arm_compute/core/Validate.h"
#include "arm_compute/core/Window.h"

#include <arm_neon.h>
#include <cstddef>
#include <cstdint>

using namespace arm_compute;

namespace
{
// Internal load
inline float32x4_t internal_vld1q(const float *in)
{
    return vld1q_f32(in);
}
inline qint8x16_t internal_vld1q(const qint8_t *in)
{
    return vld1q_qs8(in);
}
inline qint16x8_t internal_vld1q(const qint16_t *in)
{
    return vld1q_qs16(in);
}

// Internal store
inline void internal_vst1q(float *p, const float32x4_t &v)
{
    vst1q_f32(p, v);
}
inline void internal_vst1q(qint8_t *p, const qint8x16_t &v)
{
    vst1q_qs8(p, v);
}
inline void internal_vst1q(qint8_t *p, const qint16x8_t &v)
{
    vst1_qs8(p, vqmovn_s16(v));
}
inline void internal_vst1q(qint16_t *p, const qint16x8_t &v)
{
    vst1q_qs16(p, v);
}

// Internal vdup
inline float32x4_t internal_vdupq_n(float v)
{
    return vdupq_n_f32(v);
}
inline qint8x16_t internal_vdupq_n(qint8_t v)
{
    return vdupq_n_qs8(v);
}
inline qint16x8_t internal_vdupq_n(qint16_t v)
{
    return vdupq_n_qs16(v);
}

// Internal vadd
inline float32x4_t internal_vqaddq(const float32x4_t &x, const float32x4_t &y)
{
    return vaddq_f32(x, y);
}
inline qint8x16_t internal_vqaddq(const qint8x16_t &x, const qint8x16_t &y)
{
    return vqaddq_qs8(x, y);
}
inline qint16x8_t internal_vqaddq(const qint16x8_t &x, const qint16x8_t &y)
{
    return vqaddq_qs16(x, y);
}

template <typename T1, typename T2, bool in_place>
void accumulate_bias(ITensor *input, const ITensor *bias, const Window window, ITensor *output)
{
    Iterator in(input, window);

    if(in_place) // In place accumulate
    {
        execute_window_loop(window, [&](const Coordinates & id)
        {
            // Get bias and pointer to input
            const auto in_ptr = reinterpret_cast<T1 *>(in.ptr());
            const auto vb     = internal_vdupq_n(static_cast<T1>(*reinterpret_cast<const T2 *>(bias->ptr_to_element(Coordinates(id.z())))));

            // Accumulate bias
            internal_vst1q(in_ptr, internal_vqaddq(internal_vld1q(in_ptr), vb));
        },
        in);
    }
    else // Out of place accumulate
    {
        Iterator out(output, window);
        execute_window_loop(window, [&](const Coordinates & id)
        {
            // Get bias and pointer to input
            const auto in_ptr  = reinterpret_cast<const T1 *>(in.ptr());
            const auto out_ptr = reinterpret_cast<T2 *>(out.ptr());
            const auto vb      = internal_vdupq_n(static_cast<T1>(*reinterpret_cast<const T2 *>(bias->ptr_to_element(Coordinates(id.z())))));

            // Accumulate bias
            internal_vst1q(out_ptr, internal_vqaddq(internal_vld1q(in_ptr), vb));
        },
        in, out);
    }
}
} // namespace

NEDirectConvolutionLayerBiasAccumulateKernel::NEDirectConvolutionLayerBiasAccumulateKernel()
    : _func(nullptr), _input(nullptr), _bias(nullptr), _output(nullptr)
{
}

void NEDirectConvolutionLayerBiasAccumulateKernel::configure(ITensor *input, const ITensor *bias, ITensor *output)
{
    ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(input, 1, DataType::QS8, DataType::QS16, DataType::F32);
    ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(bias, 1, DataType::QS8, DataType::QS16, DataType::F32);
    ARM_COMPUTE_ERROR_ON(input->info()->fixed_point_position() != bias->info()->fixed_point_position());
    if(output != nullptr)
    {
        ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(output, 1, DataType::QS8, DataType::QS16, DataType::F32);
        ARM_COMPUTE_ERROR_ON_MISMATCHING_DATA_TYPES(bias, output);
        ARM_COMPUTE_ERROR_ON_MISMATCHING_FIXED_POINT(bias, output);
    }
    ARM_COMPUTE_ERROR_ON(bias->info()->num_dimensions() > 1);

    _func   = nullptr;
    _bias   = bias;
    _input  = input;
    _output = output;

    const unsigned int num_elems_processed_per_iteration = 16 / element_size_from_data_type(input->info()->data_type());

    // Configure kernel window
    Window                 win = calculate_max_window(*input->info(), Steps(num_elems_processed_per_iteration));
    AccessWindowHorizontal input_access(input->info(), 0, num_elems_processed_per_iteration);
    AccessWindowStatic     bias_access(bias->info(), 0, 0, bias->info()->dimension(0), bias->info()->dimension(1));
    if(output != nullptr)
    {
        AccessWindowHorizontal output_access(output->info(), 0, num_elems_processed_per_iteration);
        update_window_and_padding(win, input_access, output_access, bias_access);
        output_access.set_valid_region(win, ValidRegion(Coordinates(), output->info()->tensor_shape()));
    }
    else
    {
        update_window_and_padding(win, input_access, bias_access);
        input_access.set_valid_region(win, ValidRegion(Coordinates(), input->info()->tensor_shape()));
    }
    INEKernel::configure(win);

    // Set appropriate function
    if(input->info()->data_type() == DataType::F32)
    {
        _func = (output == nullptr) ? &accumulate_bias<float, float, true> : &accumulate_bias<float, float, false>;
    }
    else if(input->info()->data_type() == DataType::QS8)
    {
        _func = (output == nullptr) ? &accumulate_bias<qint8_t, qint8_t, true> : &accumulate_bias<qint8_t, qint8_t, false>;
    }
    else if(input->info()->data_type() == DataType::QS16 && bias->info()->data_type() == DataType::QS8)
    {
        _func = (output == nullptr) ? &accumulate_bias<qint16_t, qint8_t, true> : &accumulate_bias<qint16_t, qint8_t, false>;
    }
    else
    {
        ARM_COMPUTE_ERROR("Unsupported combination of types among the inputs.");
    }
}

void NEDirectConvolutionLayerBiasAccumulateKernel::run(const Window &window)
{
    ARM_COMPUTE_ERROR_ON_UNCONFIGURED_KERNEL(this);
    ARM_COMPUTE_ERROR_ON_INVALID_SUBWINDOW(INEKernel::window(), window);
    ARM_COMPUTE_ERROR_ON(_func == nullptr);

    (*_func)(_input, _bias, window, _output);
}