/*
 * Copyright (c) 2020-2023 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/Helpers.h"
#include "arm_compute/core/ITensorPack.h"
#include "arm_compute/core/Window.h"
#include "arm_compute/core/experimental/Types.h"
#include "arm_compute/function_info/ActivationLayerInfo.h"

#include <cmath>
#include <cstddef>

#include "src/core/NEON/SVEMath.h"
#include "src/core/NEON/SVESymm.h"
#include <arm_sve.h>

namespace arm_compute
{
namespace cpu
{
void sve2_qsymm16_activation(const ITensor *src, ITensor *dst, const ActivationLayerInfo &act_info, const Window &window)
{
    const auto                                    window_start_x = static_cast<int>(window.x().start());
    const auto                                    window_end_x   = static_cast<int>(window.x().end());
    const ActivationLayerInfo::ActivationFunction act            = act_info.activation();

    Window win_collapsed = window.collapse_if_possible(window, Window::DimZ);
    win_collapsed.set(Window::DimX, Window::Dimension(0, 1, 1));

    Iterator input(src, win_collapsed);
    Iterator output(dst, win_collapsed);

    const UniformQuantizationInfo qi_in    = src->info()->quantization_info().uniform();
    const UniformQuantizationInfo qi_out   = dst->info()->quantization_info().uniform();
    const auto                    vconst_1 = svdup_n_f32(1.f);
    const auto                    va_f32   = svdup_n_f32(act_info.a());
    const auto                    vb_f32   = svdup_n_f32(act_info.b());

    execute_window_loop(win_collapsed, [&](const Coordinates &)
    {
        const auto input_ptr  = reinterpret_cast<const int16_t *>(input.ptr());
        const auto output_ptr = reinterpret_cast<int16_t *>(output.ptr());

        svint16_t tmp;

        int      x  = window_start_x;
        svbool_t pg = svwhilelt_b16(x, window_end_x);
        do
        {
            const auto vin = svld1_s16(pg, input_ptr + x);
            if(act == ActivationLayerInfo::ActivationFunction::LOGISTIC)
            {
                // De-quantize
                auto vin_deq = svdequantize_qsymm16_z(pg, vin, qi_in.scale);
                // Perform activation
                const svfloat32x2_t tmp_dep = svcreate2_f32(svdiv_f32_z(pg, vconst_1, svadd_f32_z(pg, vconst_1, svexp_f32_z(pg, svneg_f32_z(pg, svget2_f32(vin_deq, 0))))),
                                                            svdiv_f32_z(pg, vconst_1, svadd_f32_z(pg, vconst_1, svexp_f32_z(pg, svneg_f32_z(pg, svget2_f32(vin_deq, 1))))));
                // Re-quantize to new output space
                tmp = svquantize_qsymm16_z(pg, tmp_dep, qi_out.scale);
            }
            else if(act == ActivationLayerInfo::ActivationFunction::TANH)
            {
                // De-quantize
                auto vin_deq = svdequantize_qsymm16_z(pg, vin, qi_in.scale);
                // Perform activation
                const svfloat32x2_t tmp_dep = svcreate2_f32(svmul_f32_z(pg, va_f32, svtanh_f32_z(pg, svmul_f32_z(pg, svget2_f32(vin_deq, 0), vb_f32))),
                                                            svmul_f32_z(pg, va_f32, svtanh_f32_z(pg, svmul_f32_z(pg, svget2_f32(vin_deq, 1), vb_f32))));
                // Re-quantize to new output space
                tmp = svquantize_qsymm16_z(pg, tmp_dep, qi_out.scale);
            }
            else if(act == ActivationLayerInfo::ActivationFunction::LU_BOUNDED_RELU)
            {
                // De-quantize
                auto vin_deq = svdequantize_qsymm16_z(pg, vin, qi_in.scale);
                // Perform activation
                const svfloat32x2_t tmp_dep = svcreate2_f32(svmin_f32_z(pg, va_f32, svmax_f32_z(pg, vb_f32, svget2_f32(vin_deq, 0))),
                                                            svmin_f32_z(pg, va_f32, svmax_f32_z(pg, vb_f32, svget2_f32(vin_deq, 1))));
                // Re-quantize to new output space
                tmp = svquantize_qsymm16_z(pg, tmp_dep, qi_out.scale);
            }
            else
            {
                ARM_COMPUTE_ERROR("Unsupported activation function");
            }

            svst1_s16(pg, output_ptr + x, tmp);

            x += svcnth();
            pg = svwhilelt_b16(x, window_end_x);

        }
        while(svptest_any(svptrue_b16(), pg));
    },
    input, output);
}
} // namespace cpu
} // namespace arm_compute