/*
 * Copyright (c) 2016-2022 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 "src/cpu/kernels/CpuCastKernel.h"

#include "arm_compute/core/Error.h"
#include "arm_compute/core/Helpers.h"
#include "arm_compute/core/ITensor.h"
#include "arm_compute/core/TensorInfo.h"
#include "arm_compute/core/Validate.h"
#include "src/core/CPP/Validate.h"
#include "src/core/NEON/NEFixedPoint.h"
#include "src/core/NEON/NEMath.h"
#include "src/core/NEON/wrapper/wrapper.h"
#include "src/core/common/Registrars.h"
#include "src/core/helpers/AutoConfiguration.h"
#include "src/core/helpers/WindowHelpers.h"
#include "support/SaturateCast.h"

#include "src/cpu/kernels/cast/list.h"

namespace arm_compute
{
namespace cpu
{
namespace kernels
{
namespace
{
static const std::vector<CpuCastKernel::CastKernel> available_kernels =
{
    {
        "neon_qs8_cast",
        [](const CastDataTypeISASelectorData & data) { return data.src_dt == DataType::QASYMM8_SIGNED && data.dst_dt == DataType::F16 && data.isa.fp16; },
        REGISTER_FP16_NEON(arm_compute::cpu::neon_qasymm8_signed_to_fp16_cast)
    },
    {
        "neon_qu8_cast",
        [](const CastDataTypeISASelectorData & data) { return data.src_dt == DataType::QASYMM8 && data.dst_dt == DataType::F16 && data.isa.fp16; },
        REGISTER_FP16_NEON(arm_compute::cpu::neon_u8_to_fp16_cast)
    },
    {
        "neon_u8_cast",
        [](const CastDataTypeISASelectorData & data) { return data.src_dt == DataType::U8 && data.dst_dt == DataType::F16 && data.isa.fp16; },
        REGISTER_FP16_NEON(arm_compute::cpu::neon_u8_to_fp16_cast)
    },
    {
        "neon_fp16_cast",
        [](const CastDataTypeISASelectorData & data) { return data.src_dt == DataType::F16 && data.isa.fp16; },
        REGISTER_FP16_NEON(arm_compute::cpu::neon_fp16_to_other_dt_cast)
    },
    {
        "neon_fp32_to_fp16_cast",
        [](const CastDataTypeISASelectorData & data) { return data.src_dt == DataType::F32 && data.dst_dt == DataType::F16 && data.isa.fp16; },
        REGISTER_FP16_NEON(arm_compute::cpu::neon_fp32_to_fp16_cast)
    },
    {
        "neon_fp32_to_bf16_cast",
        [](const CastDataTypeISASelectorData & data) { return data.src_dt == DataType::F32 && data.dst_dt == DataType::BFLOAT16 && data.isa.bf16; },
        REGISTER_BF16_NEON(arm_compute::cpu::neon_fp32_to_bfloat16_cast)
    },
    {
        "neon_s32_cast",
        [](const CastDataTypeISASelectorData & data) { return data.src_dt == DataType::S32 && data.dst_dt == DataType::F16 && data.isa.fp16; },
        REGISTER_FP16_NEON(arm_compute::cpu::neon_s32_to_fp16_cast)
    },
    {
        "neon_bf16_cast",
        [](const CastDataTypeISASelectorData & data) { return data.src_dt == DataType::BFLOAT16 && data.dst_dt == DataType::F32 && data.isa.bf16; },
        REGISTER_BF16_NEON(arm_compute::cpu::neon_bfloat16_to_fp32_cast)
    },
};

Status validate_arguments(const ITensorInfo *src, const ITensorInfo *dst, ConvertPolicy policy)
{
    ARM_COMPUTE_RETURN_ERROR_ON_CPU_F16_UNSUPPORTED(src);
    ARM_COMPUTE_RETURN_ERROR_ON_CPU_F16_UNSUPPORTED(dst);
    ARM_COMPUTE_RETURN_ERROR_ON_CPU_BF16_UNSUPPORTED(src);
    ARM_COMPUTE_RETURN_ERROR_ON_CPU_BF16_UNSUPPORTED(dst);
    ARM_COMPUTE_UNUSED(policy);
    ARM_COMPUTE_RETURN_ERROR_ON(src == dst);
    ARM_COMPUTE_RETURN_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(src, 1, DataType::QASYMM8_SIGNED, DataType::QASYMM8, DataType::U8,
                                                         DataType::S16, DataType::U16, DataType::BFLOAT16, DataType::F16,
                                                         DataType::F32, DataType::S32);
    ARM_COMPUTE_RETURN_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(dst, 1, DataType::QASYMM8_SIGNED, DataType::QASYMM8, DataType::U8,
                                                         DataType::S16, DataType::U16, DataType::BFLOAT16, DataType::F16,
                                                         DataType::U32, DataType::S32, DataType::F32);

    ARM_COMPUTE_RETURN_ERROR_ON_MSG(src->data_type() == DataType::QASYMM8_SIGNED && (dst->data_type() != DataType::S16 && dst->data_type() != DataType::S32
                                                                                     && dst->data_type() != DataType::F16 && dst->data_type() != DataType::F32),
                                    "Only data_types supported [in] QASYMM8 -> [out] U16, S16, S32, F16, F32");

    ARM_COMPUTE_RETURN_ERROR_ON_MSG(src->data_type() == DataType::QASYMM8 && (dst->data_type() != DataType::S16 && dst->data_type() != DataType::U16
                                                                              && dst->data_type() != DataType::S32 && dst->data_type() != DataType::F16 && dst->data_type() != DataType::F32),
                                    "Only data_types supported [in] QASYMM8 -> [out] U16, S16, S32, F16, F32");

    ARM_COMPUTE_RETURN_ERROR_ON_MSG(src->data_type() == DataType::U8 && (dst->data_type() != DataType::S16 && dst->data_type() != DataType::U16
                                                                         && dst->data_type() != DataType::S32 && dst->data_type() != DataType::F16 && dst->data_type() != DataType::F32),
                                    "Only data_types supported [in] U8 -> [out] U16, S16, S32, F16, F32");

    ARM_COMPUTE_RETURN_ERROR_ON_MSG(src->data_type() == DataType::U16 && (dst->data_type() != DataType::U8 && dst->data_type() != DataType::U32),
                                    "Only data_types supported [in] U16 ->  [out] U8, U32");

    ARM_COMPUTE_RETURN_ERROR_ON_MSG(src->data_type() == DataType::S16 && (dst->data_type() != DataType::QASYMM8_SIGNED && dst->data_type() != DataType::U8 && dst->data_type() != DataType::S32),
                                    "Only data_types supported [in] S16 ->  [out] U8, S32");

    ARM_COMPUTE_RETURN_ERROR_ON_MSG(src->data_type() == DataType::BFLOAT16 && dst->data_type() != DataType::F32,
                                    "Only data_types supported [in] BFLOAT16 ->  [out] F32");

    ARM_COMPUTE_RETURN_ERROR_ON_MSG(src->data_type() == DataType::F16 && (dst->data_type() != DataType::QASYMM8_SIGNED && dst->data_type() != DataType::QASYMM8
                                                                          && dst->data_type() != DataType::U8
                                                                          && dst->data_type() != DataType::F32 && dst->data_type() != DataType::S32),
                                    "Only data_types supported [in] F16 ->  [out] QASYMM8, F32, S32, U8");

    ARM_COMPUTE_RETURN_ERROR_ON_MSG(src->data_type() == DataType::F32 && (dst->data_type() != DataType::QASYMM8_SIGNED && dst->data_type() != DataType::QASYMM8
                                                                          && dst->data_type() != DataType::F16 && dst->data_type() != DataType::BFLOAT16
                                                                          && dst->data_type() != DataType::S32 && dst->data_type() != DataType::U8),
                                    "Only data_types supported [in] F32 ->  [out] QASYMM8, BFLOAT16, F16, S32, U8");

    ARM_COMPUTE_RETURN_ERROR_ON_MSG(src->data_type() == DataType::S32 && (dst->data_type() != DataType::QASYMM8_SIGNED && dst->data_type() != DataType::QASYMM8
                                                                          && dst->data_type() != DataType::F16
                                                                          && dst->data_type() != DataType::F32 && dst->data_type() != DataType::U8),
                                    "Only data_types supported [in] S32 ->  [out] QASYMM8, F16, F32, U8");

    // Validate in case of configured dst
    if(dst->total_size() > 0)
    {
        ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_SHAPES(src, dst);
    }

    return Status{};
}
} // namespace

void CpuCastKernel::configure(const ITensorInfo *src, ITensorInfo *dst, ConvertPolicy policy)
{
    ARM_COMPUTE_ERROR_ON_NULLPTR(src, dst);

    // Auto initialize dst shape if not initialized (We can only auto-configure the shape, datatype must be given)
    set_shape_if_empty(*dst, src->tensor_shape());

    _policy = policy;

    ARM_COMPUTE_ERROR_THROW_ON(validate_arguments(src, dst, policy));

    // Configure kernel window
    Window win = calculate_max_window(*src, Steps());

    ICPPKernel::configure(win);
}

Status CpuCastKernel::validate(const ITensorInfo *src, const ITensorInfo *dst, ConvertPolicy policy)
{
    ARM_COMPUTE_RETURN_ON_ERROR(validate_arguments(src, dst, policy));
    return Status{};
}

void CpuCastKernel::run_op(ITensorPack &tensors, const Window &window, const ThreadInfo &info)
{
    ARM_COMPUTE_UNUSED(info);
    ARM_COMPUTE_ERROR_ON_UNCONFIGURED_KERNEL(this);
    ARM_COMPUTE_ERROR_ON_INVALID_SUBWINDOW(IKernel::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 int  window_step_x  = 16;

    const ITensor *_src = tensors.get_const_tensor(TensorType::ACL_SRC);
    ITensor       *_dst = tensors.get_tensor(TensorType::ACL_DST);
    ARM_COMPUTE_ERROR_ON_NULLPTR(_src, _dst);
    ARM_COMPUTE_ERROR_ON(_src == _dst);

    ARM_COMPUTE_ERROR_ON_NULLPTR(_src, _dst);

    Window win{ window };
    win.set(Window::DimX, Window::Dimension(0, 1, 1));

    Iterator src(_src, win);
    Iterator dst(_dst, win);

    /*ukernel runs only when using fp16/bfloat16, so we validate it isn't a nullptr only before using it */
    const auto *uk = CpuCastKernel::get_implementation(CastDataTypeISASelectorData{ _src->info()->data_type(), _dst->info()->data_type(), CPUInfo::get().get_isa() });

    switch(_src->info()->data_type())
    {
        case DataType::QASYMM8_SIGNED:
        {
            switch(_dst->info()->data_type())
            {
                case DataType::S16:
                {
                    /* Up-conversion QASYMM8_SIGNED -> S16 */
                    execute_window_loop(win, [&](const Coordinates &)
                    {
                        const auto src_ptr = reinterpret_cast<const int8_t *>(src.ptr());
                        const auto dst_ptr = reinterpret_cast<int16_t *>(dst.ptr());
                        int        x       = window_start_x;

                        for(; x <= (window_end_x - window_step_x); x += window_step_x)
                        {
                            const int8x16_t texels_s8 = vld1q_s8(src_ptr + x);

                            const int16x8x2_t texels =
                            {
                                {
                                    vmovl_s8(vget_low_s8(texels_s8)),
                                    vmovl_s8(vget_high_s8(texels_s8))
                                }
                            };

                            vst1q_s16(dst_ptr + x, texels.val[0]);
                            vst1q_s16(dst_ptr + x + 8, texels.val[1]);
                        }

                        // Compute left-over elements
                        for(; x < window_end_x; ++x)
                        {
                            *(dst_ptr + x) = static_cast<int16_t>(*(src_ptr + x));
                        }
                    },
                    src, dst);
                    break;
                }
                case DataType::S32:
                {
                    /* Up-conversion QASYMM8_SIGNED -> S32 */
                    execute_window_loop(win, [&](const Coordinates &)
                    {
                        const auto src_ptr = reinterpret_cast<const int8_t *>(src.ptr());
                        const auto dst_ptr = reinterpret_cast<int32_t *>(dst.ptr());
                        int        x       = window_start_x;

                        for(; x <= (window_end_x - window_step_x); x += window_step_x)
                        {
                            const int8x16_t texels_s8 = vld1q_s8(src_ptr + x);

                            const int16x8x2_t texels =
                            {
                                {
                                    vmovl_s8(vget_low_s8(texels_s8)),
                                    vmovl_s8(vget_high_s8(texels_s8))
                                }
                            };

                            vst1q_s32(dst_ptr + x, vmovl_s16(vget_low_s16(texels.val[0])));
                            vst1q_s32(dst_ptr + x + 4, vmovl_s16(vget_high_s16(texels.val[0])));
                            vst1q_s32(dst_ptr + x + 8, vmovl_s16(vget_low_s16(texels.val[1])));
                            vst1q_s32(dst_ptr + x + 12, vmovl_s16(vget_high_s16(texels.val[1])));
                        }

                        // Compute left-over elements
                        for(; x < window_end_x; ++x)
                        {
                            *(dst_ptr + x) = static_cast<int32_t>(*(src_ptr + x));
                        }
                    },
                    src, dst);
                    break;
                }
                case DataType::F32:
                {
                    /* Up-conversion QASYMM8_SIGNED -> F32 */
                    execute_window_loop(win, [&](const Coordinates &)
                    {
                        const auto src_ptr = reinterpret_cast<const int8_t *>(src.ptr());
                        const auto dst_ptr = reinterpret_cast<float *>(dst.ptr());

                        int x = window_start_x;
                        for(; x <= (window_end_x - window_step_x); x += window_step_x)
                        {
                            const int8x16_t texels_s8 = vld1q_s8(src_ptr + x);

                            const int16x8x2_t texels =
                            {
                                {
                                    vmovl_s8(vget_low_s8(texels_s8)),
                                    vmovl_s8(vget_high_s8(texels_s8))
                                }
                            };
                            vst1q_f32(dst_ptr + x, vcvtq_f32_s32(vmovl_s16(vget_low_s16(texels.val[0]))));
                            vst1q_f32(dst_ptr + x + 4, vcvtq_f32_s32(vmovl_s16(vget_high_s16(texels.val[0]))));
                            vst1q_f32(dst_ptr + x + 8, vcvtq_f32_s32(vmovl_s16(vget_low_s16(texels.val[1]))));
                            vst1q_f32(dst_ptr + x + 12, vcvtq_f32_s32(vmovl_s16(vget_high_s16(texels.val[1]))));
                        }

                        // Compute left-over elements
                        for(; x < window_end_x; ++x)
                        {
                            *(dst_ptr + x) = static_cast<float>(*(src_ptr + x));
                        }
                    },
                    src, dst);
                    break;
                }
                case DataType::F16:
                {
                    /* Up-conversion QASYMM8_SIGNED -> F16 */
                    ARM_COMPUTE_ERROR_ON(uk->ukernel == nullptr);
                    uk->ukernel(_src, _dst, info, _policy, window);
                    break;
                }
                default:
                    ARM_COMPUTE_ERROR("dst data type not supported");
            }
            break;
        }

        case DataType::QASYMM8:
        case DataType::U8:
        {
            switch(_dst->info()->data_type())
            {
                case DataType::S16:
                {
                    /* Up-conversion U8 -> S16 */
                    execute_window_loop(win, [&](const Coordinates &)
                    {
                        const auto src_ptr = reinterpret_cast<const uint8_t *>(src.ptr());
                        const auto dst_ptr = reinterpret_cast<int16_t *>(dst.ptr());

                        int x = window_start_x;
                        for(; x <= (window_end_x - window_step_x); x += window_step_x)
                        {
                            const uint8x16_t texels_u8 = vld1q_u8(src_ptr + x);

                            const int16x8x2_t texels =
                            {
                                {
                                    vreinterpretq_s16_u16(vmovl_u8(vget_low_u8(texels_u8))),
                                    vreinterpretq_s16_u16(vmovl_u8(vget_high_u8(texels_u8)))
                                }
                            };

                            vst1q_s16(dst_ptr + x, texels.val[0]);
                            vst1q_s16(dst_ptr + x + 8, texels.val[1]);
                        }

                        // Compute left-over elements
                        for(; x < window_end_x; ++x)
                        {
                            *(dst_ptr + x) = static_cast<int32_t>(*(src_ptr + x));
                        }
                    },
                    src, dst);
                    break;
                }
                case DataType::S32:
                {
                    /* Up-conversion U8 -> S32 */
                    execute_window_loop(win, [&](const Coordinates &)
                    {
                        const auto src_ptr = reinterpret_cast<const uint8_t *>(src.ptr());
                        const auto dst_ptr = reinterpret_cast<int32_t *>(dst.ptr());

                        int x = window_start_x;
                        for(; x <= (window_end_x - window_step_x); x += window_step_x)
                        {
                            const uint8x16_t texels_u8 = vld1q_u8(src_ptr + x);

                            const int16x8x2_t texels =
                            {
                                {
                                    vreinterpretq_s16_u16(vmovl_u8(vget_low_u8(texels_u8))),
                                    vreinterpretq_s16_u16(vmovl_u8(vget_high_u8(texels_u8)))
                                }
                            };

                            vst1q_s32(dst_ptr + x, vmovl_s16(vget_low_s16(texels.val[0])));
                            vst1q_s32(dst_ptr + x + 4, vmovl_s16(vget_high_s16(texels.val[0])));
                            vst1q_s32(dst_ptr + x + 8, vmovl_s16(vget_low_s16(texels.val[1])));
                            vst1q_s32(dst_ptr + x + 12, vmovl_s16(vget_high_s16(texels.val[1])));
                        }

                        // Compute left-over elements
                        for(; x < window_end_x; ++x)
                        {
                            *(dst_ptr + x) = static_cast<uint32_t>(*(src_ptr + x));
                        }
                    },
                    src, dst);
                    break;
                }
                case DataType::F32:
                {
                    /* Up-conversion U8 -> F32 */
                    execute_window_loop(win, [&](const Coordinates &)
                    {
                        const auto src_ptr = reinterpret_cast<const uint8_t *>(src.ptr());
                        const auto dst_ptr = reinterpret_cast<float *>(dst.ptr());

                        int x = window_start_x;
                        for(; x <= (window_end_x - window_step_x); x += window_step_x)
                        {
                            const uint8x16_t texels_u8 = vld1q_u8(src_ptr + x);

                            const int16x8x2_t texels =
                            {
                                {
                                    vreinterpretq_s16_u16(vmovl_u8(vget_low_u8(texels_u8))),
                                    vreinterpretq_s16_u16(vmovl_u8(vget_high_u8(texels_u8)))
                                }
                            };
                            vst1q_f32(dst_ptr + x, vcvtq_f32_s32(vmovl_s16(vget_low_s16(texels.val[0]))));
                            vst1q_f32(dst_ptr + x + 4, vcvtq_f32_s32(vmovl_s16(vget_high_s16(texels.val[0]))));
                            vst1q_f32(dst_ptr + x + 8, vcvtq_f32_s32(vmovl_s16(vget_low_s16(texels.val[1]))));
                            vst1q_f32(dst_ptr + x + 12, vcvtq_f32_s32(vmovl_s16(vget_high_s16(texels.val[1]))));
                        }

                        // Compute left-over elements
                        for(; x < window_end_x; ++x)
                        {
                            *(dst_ptr + x) = static_cast<uint32_t>(*(src_ptr + x));
                        }
                    },
                    src, dst);
                    break;
                }
                case DataType::F16:
                {
                    /* Up-conversion U8 -> FP16 */
                    ARM_COMPUTE_ERROR_ON(uk->ukernel == nullptr);
                    uk->ukernel(_src, _dst, info, _policy, window);
                    break;
                }
                case DataType::U16:
                {
                    /* Up-conversion U8 -> U16 */
                    execute_window_loop(win, [&](const Coordinates &)
                    {
                        const auto src_ptr = reinterpret_cast<const uint8_t *>(src.ptr());
                        const auto dst_ptr = reinterpret_cast<uint16_t *>(dst.ptr());

                        int x = window_start_x;
                        for(; x <= (window_end_x - window_step_x); x += window_step_x)
                        {
                            const uint8x16_t texels_u8 = vld1q_u8(src_ptr + x);

                            const uint16x8x2_t texels =
                            {
                                {
                                    vmovl_u8(vget_low_u8(texels_u8)),
                                    vmovl_u8(vget_high_u8(texels_u8))
                                }
                            };

                            vst1q_u16(dst_ptr + x, texels.val[0]);
                            vst1q_u16(dst_ptr + x + 8, texels.val[1]);
                        }

                        // Compute left-over elements
                        for(; x < window_end_x; ++x)
                        {
                            *(dst_ptr + x) = static_cast<uint16_t>(*(src_ptr + x));
                        }
                    },
                    src, dst);
                    break;
                }
                default:
                    ARM_COMPUTE_ERROR("dst data type not supported");
            }
            break;
        }
        case DataType::S16:
        {
            switch(_dst->info()->data_type())
            {
                case DataType::QASYMM8_SIGNED:
                {
                    /* Down-conversion S16 -> QASYMM8_SIGNED */
                    if(ConvertPolicy::SATURATE == _policy)
                    {
                        execute_window_loop(win, [&](const Coordinates &)
                        {
                            const auto src_ptr = reinterpret_cast<const int16_t *>(src.ptr());
                            const auto dst_ptr = reinterpret_cast<int8_t *>(dst.ptr());

                            int x = window_start_x;
                            for(; x <= (window_end_x - window_step_x); x += window_step_x)
                            {
                                const int16x8x2_t texels =
                                {
                                    {
                                        vld1q_s16(src_ptr + x),
                                        vld1q_s16(src_ptr + x + 8)
                                    }
                                };

                                vst1q_s8(dst_ptr + x, vcombine_s8(vqmovn_s16(texels.val[0]), vqmovn_s16(texels.val[1])));
                            }

                            // Compute left-over elements
                            for(; x < window_end_x; ++x)
                            {
                                *(dst_ptr + x) = utils::cast::saturate_cast<int8_t>(*(src_ptr + x));
                            }
                        },
                        src, dst);
                    }
                    else
                    {
                        execute_window_loop(win, [&](const Coordinates &)
                        {
                            const auto src_ptr = reinterpret_cast<const int16_t *>(src.ptr());
                            const auto dst_ptr = reinterpret_cast<int8_t *>(dst.ptr());

                            int x = window_start_x;
                            for(; x <= (window_end_x - window_step_x); x += window_step_x)
                            {
                                const int16x8x2_t texels =
                                {
                                    {
                                        vld1q_s16(src_ptr + x),
                                        vld1q_s16(src_ptr + x + 8)
                                    }
                                };

                                vst1q_s8(dst_ptr + x, vcombine_s8(vmovn_s16(texels.val[0]), vmovn_s16(texels.val[1])));
                            }

                            // Compute left-over elements
                            for(; x < window_end_x; ++x)
                            {
                                *(dst_ptr + x) = static_cast<int8_t>(*(src_ptr + x));
                            }
                        },
                        src, dst);
                    }
                    break;
                }
                case DataType::U8:
                {
                    /* Down-conversion S16 -> U8 */
                    if(ConvertPolicy::SATURATE == _policy)
                    {
                        execute_window_loop(win, [&](const Coordinates &)
                        {
                            const auto src_ptr = reinterpret_cast<const int16_t *>(src.ptr());
                            const auto dst_ptr = reinterpret_cast<uint8_t *>(dst.ptr());

                            int x = window_start_x;
                            for(; x <= (window_end_x - window_step_x); x += window_step_x)
                            {
                                const int16x8x2_t texels =
                                {
                                    {
                                        vld1q_s16(src_ptr + x),
                                        vld1q_s16(src_ptr + x + 8)
                                    }
                                };

                                vst1q_u8(dst_ptr + x, vcombine_u8(vqmovun_s16(texels.val[0]), vqmovun_s16(texels.val[1])));
                            }

                            // Compute left-over elements
                            for(; x < window_end_x; ++x)
                            {
                                *(dst_ptr + x) = utils::cast::saturate_cast<uint8_t>(*(src_ptr + x));
                            }
                        },
                        src, dst);
                    }
                    else
                    {
                        execute_window_loop(win, [&](const Coordinates &)
                        {
                            const auto src_ptr = reinterpret_cast<const int16_t *>(src.ptr());
                            const auto dst_ptr = reinterpret_cast<uint8_t *>(dst.ptr());

                            int x = window_start_x;
                            for(; x <= (window_end_x - window_step_x); x += window_step_x)
                            {
                                const int16x8x2_t texels =
                                {
                                    {
                                        vld1q_s16(src_ptr + x),
                                        vld1q_s16(src_ptr + x + 8)
                                    }
                                };

                                vst1q_u8(dst_ptr + x, vcombine_u8(vmovn_u16(vreinterpretq_u16_s16(texels.val[0])),
                                                                  vmovn_u16(vreinterpretq_u16_s16(texels.val[1]))));
                            }

                            // Compute left-over elements
                            for(; x < window_end_x; ++x)
                            {
                                *(dst_ptr + x) = static_cast<uint8_t>(*(src_ptr + x));
                            }
                        },
                        src, dst);
                    }
                    break;
                }
                case DataType::S32:
                {
                    /* Up-conversion S16 -> S32 */
                    execute_window_loop(win, [&](const Coordinates &)
                    {
                        const auto src_ptr = reinterpret_cast<const int16_t *>(src.ptr());
                        const auto dst_ptr = reinterpret_cast<int32_t *>(dst.ptr());

                        int x = window_start_x;
                        for(; x <= (window_end_x - window_step_x); x += window_step_x)
                        {
                            const int16x8x2_t texels =
                            {
                                {
                                    vld1q_s16(src_ptr + x),
                                    vld1q_s16(src_ptr + x + 8)
                                }
                            };

                            const int32x4x4_t texels_s32 =
                            {
                                {
                                    vmovl_s16(vget_low_s16(texels.val[0])),
                                    vmovl_s16(vget_high_s16(texels.val[0])),
                                    vmovl_s16(vget_low_s16(texels.val[1])),
                                    vmovl_s16(vget_high_s16(texels.val[1]))
                                }
                            };

                            vst1q_s32(dst_ptr + x, texels_s32.val[0]);
                            vst1q_s32(dst_ptr + x + 4, texels_s32.val[1]);
                            vst1q_s32(dst_ptr + x + 8, texels_s32.val[2]);
                            vst1q_s32(dst_ptr + x + 12, texels_s32.val[3]);
                        }

                        // Compute left-over elements
                        for(; x < window_end_x; ++x)
                        {
                            *(dst_ptr + x) = static_cast<int32_t>(*(src_ptr + x));
                        }
                    },
                    src, dst);
                    break;
                }
                default:
                    ARM_COMPUTE_ERROR("dst data type not supported");
            }
            break;
        }

        case DataType::U16:
        {
            switch(_dst->info()->data_type())
            {
                case DataType::U8:
                {
                    /* Down-conversion U16 -> U8 */
                    if(ConvertPolicy::SATURATE == _policy)
                    {
                        execute_window_loop(win, [&](const Coordinates &)
                        {
                            const auto src_ptr = reinterpret_cast<const uint16_t *>(src.ptr());
                            const auto dst_ptr = reinterpret_cast<uint8_t *>(dst.ptr());

                            int x = window_start_x;
                            for(; x <= (window_end_x - window_step_x); x += window_step_x)
                            {
                                const uint16x8x2_t texels =
                                {
                                    {
                                        vld1q_u16(src_ptr + x),
                                        vld1q_u16(src_ptr + x + 8)
                                    }
                                };

                                vst1q_u8(dst_ptr + x, vcombine_u8(vqmovn_u16(texels.val[0]), vqmovn_u16(texels.val[1])));
                            }

                            // Compute left-over elements
                            for(; x < window_end_x; ++x)
                            {
                                *(dst_ptr + x) = utils::cast::saturate_cast<uint8_t>(*(src_ptr + x));
                            }
                        },
                        src, dst);
                    }
                    else
                    {
                        execute_window_loop(win, [&](const Coordinates &)
                        {
                            const auto src_ptr = reinterpret_cast<const uint16_t *>(src.ptr());
                            const auto dst_ptr = reinterpret_cast<uint8_t *>(dst.ptr());

                            int x = window_start_x;
                            for(; x <= (window_end_x - window_step_x); x += window_step_x)
                            {
                                const uint16x8x2_t texels =
                                {
                                    {
                                        vld1q_u16(src_ptr + x),
                                        vld1q_u16(src_ptr + x + 8)
                                    }
                                };

                                vst1q_u8(dst_ptr + x, vcombine_u8(vmovn_u16(texels.val[0]), vmovn_u16(texels.val[1])));
                            }

                            // Compute left-over elements
                            for(; x < window_end_x; ++x)
                            {
                                *(dst_ptr + x) = static_cast<uint8_t>(*(src_ptr + x));
                            }

                        },
                        src, dst);
                    }
                    break;
                }
                case DataType::U32:
                {
                    /* Up-conversion U16 -> U32 */
                    execute_window_loop(win, [&](const Coordinates &)
                    {
                        const auto src_ptr = reinterpret_cast<const uint16_t *>(src.ptr());
                        const auto dst_ptr = reinterpret_cast<uint32_t *>(dst.ptr());

                        int x = window_start_x;
                        for(; x <= (window_end_x - window_step_x); x += window_step_x)
                        {
                            const uint16x8x2_t texels =
                            {
                                {
                                    vld1q_u16(src_ptr + x),
                                    vld1q_u16(src_ptr + x + 8)
                                }
                            };

                            vst1q_u32(dst_ptr + x, vmovl_u16(vget_low_u16(texels.val[0])));
                            vst1q_u32(dst_ptr + x + 4, vmovl_u16(vget_high_u16(texels.val[0])));
                            vst1q_u32(dst_ptr + x + 8, vmovl_u16(vget_low_u16(texels.val[1])));
                            vst1q_u32(dst_ptr + x + 12, vmovl_u16(vget_high_u16(texels.val[1])));
                        }
                        // Compute left-over elements
                        for(; x < window_end_x; ++x)
                        {
                            *(dst_ptr + x) = static_cast<uint32_t>(*(src_ptr + x));
                        }

                    },
                    src, dst);
                    break;
                }
                default:
                    ARM_COMPUTE_ERROR("dst data type not supported");
            }
            break;
        }
        case DataType::BFLOAT16:
        {
            /* Up-conversion BFLOAT16 -> F32 */
            ARM_COMPUTE_ERROR_ON(uk->ukernel == nullptr);
            uk->ukernel(_src, _dst, info, _policy, window);
            break;
        }
        case DataType::F16:
        {
            /* conversion F16 -> any data type */
            ARM_COMPUTE_ERROR_ON(uk->ukernel == nullptr);
            uk->ukernel(_src, _dst, info, _policy, window);
            break;
        }
        case DataType::F32:
            switch(_dst->info()->data_type())
            {
                case DataType::F16:
                {
                    /* Down-conversion F32 -> F16 */
                    ARM_COMPUTE_ERROR_ON(uk->ukernel == nullptr);
                    uk->ukernel(_src, _dst, info, _policy, window);
                    break;
                }
                case DataType::BFLOAT16:
                {
                    /* Down-conversion F32 -> BFLOAT16 */
                    ARM_COMPUTE_ERROR_ON(uk->ukernel == nullptr);
                    uk->ukernel(_src, _dst, info, _policy, window);
                    break;
                }
                case DataType::S32:
                {
                    /* Conversion F32 -> S32 */
                    execute_window_loop(win, [&](const Coordinates &)
                    {
                        const auto src_ptr = reinterpret_cast<const float *>(src.ptr());
                        const auto dst_ptr = reinterpret_cast<int32_t *>(dst.ptr());

                        int x = window_start_x;
                        for(; x <= (window_end_x - window_step_x); x += window_step_x)
                        {
                            const float32x4x4_t texels =
                            {
                                {
                                    vld1q_f32(src_ptr + x),
                                    vld1q_f32(src_ptr + x + 4),
                                    vld1q_f32(src_ptr + x + 8),
                                    vld1q_f32(src_ptr + x + 12),
                                }
                            };

                            vst1q_s32(dst_ptr + x, vcvtq_s32_f32(texels.val[0]));
                            vst1q_s32(dst_ptr + x + 4, vcvtq_s32_f32(texels.val[1]));
                            vst1q_s32(dst_ptr + x + 8, vcvtq_s32_f32(texels.val[2]));
                            vst1q_s32(dst_ptr + x + 12, vcvtq_s32_f32(texels.val[3]));
                        }

                        // Compute left-over elements
                        for(; x < window_end_x; ++x)
                        {
                            *(dst_ptr + x) = static_cast<int32_t>(*(src_ptr + x));
                        }
                    },
                    src, dst);
                    break;
                }
                case DataType::QASYMM8:
                case DataType::U8:
                {
                    /* Down-conversion F32 -> U8 */
                    execute_window_loop(win, [&](const Coordinates &)
                    {
                        const auto src_ptr = reinterpret_cast<const float *>(src.ptr());
                        const auto dst_ptr = reinterpret_cast<uint8_t *>(dst.ptr());

                        int x = window_start_x;
                        for(; x <= (window_end_x - window_step_x); x += window_step_x)
                        {
                            const float32x4x4_t texels =
                            {
                                {
                                    vld1q_f32(src_ptr + x),
                                    vld1q_f32(src_ptr + x + 4),
                                    vld1q_f32(src_ptr + x + 8),
                                    vld1q_f32(src_ptr + x + 12),
                                }
                            };

                            vst1_u8(dst_ptr + x, vqmovn_u16(vcombine_u16(vqmovun_s32(vcvtq_s32_f32(texels.val[0])), vqmovun_s32(vcvtq_s32_f32(texels.val[1])))));
                            vst1_u8(dst_ptr + x + 8, vqmovn_u16(vcombine_u16(vqmovun_s32(vcvtq_s32_f32(texels.val[2])), vqmovun_s32(vcvtq_s32_f32(texels.val[3])))));
                        }

                        // Compute left-over elements
                        for(; x < window_end_x; ++x)
                        {
                            *(dst_ptr + x) = utils::cast::saturate_cast<uint8_t>(*(src_ptr + x));
                        }
                    },
                    src, dst);
                    break;
                }
                case DataType::QASYMM8_SIGNED:
                {
                    /* Down-conversion F32 -> QASYMM8_SIGNED */
                    execute_window_loop(win, [&](const Coordinates &)
                    {
                        const auto src_ptr = reinterpret_cast<const float *>(src.ptr());
                        const auto dst_ptr = reinterpret_cast<int8_t *>(dst.ptr());

                        int x = window_start_x;
                        for(; x <= (window_end_x - window_step_x); x += window_step_x)
                        {
                            const float32x4x4_t texels =
                            {
                                {
                                    vld1q_f32(src_ptr + x),
                                    vld1q_f32(src_ptr + x + 4),
                                    vld1q_f32(src_ptr + x + 8),
                                    vld1q_f32(src_ptr + x + 12),
                                }
                            };

                            vst1_s8(dst_ptr + x, vqmovn_s16(vcombine_s16(vqmovn_s32(vcvtq_s32_f32(texels.val[0])), vqmovn_s32(vcvtq_s32_f32(texels.val[1])))));
                            vst1_s8(dst_ptr + x + 8, vqmovn_s16(vcombine_s16(vqmovn_s32(vcvtq_s32_f32(texels.val[2])), vqmovn_s32(vcvtq_s32_f32(texels.val[3])))));
                        }
                        // Compute left-over elements
                        for(; x < window_end_x; ++x)
                        {
                            *(dst_ptr + x) = utils::cast::saturate_cast<int8_t>(*(src_ptr + x));
                        }
                    },
                    src, dst);
                    break;
                }

                default:
                    ARM_COMPUTE_ERROR("dst data type not supported");
            }
            break;

        case DataType::S32:
            switch(_dst->info()->data_type())
            {
                case DataType::F16:
                {
                    /* Down-conversion S32 -> F16 */
                    ARM_COMPUTE_ERROR_ON(uk->ukernel == nullptr);
                    uk->ukernel(_src, _dst, info, _policy, window);
                    break;
                }
                case DataType::F32:
                {
                    /* Conversion S32 -> F32 */
                    execute_window_loop(win, [&](const Coordinates &)
                    {
                        const auto src_ptr = reinterpret_cast<const int32_t *>(src.ptr());
                        const auto dst_ptr = reinterpret_cast<float *>(dst.ptr());

                        int x = window_start_x;
                        for(; x <= (window_end_x - window_step_x); x += window_step_x)
                        {
                            const int32x4x4_t texels =
                            {
                                {
                                    vld1q_s32(src_ptr + x),
                                    vld1q_s32(src_ptr + x + 4),
                                    vld1q_s32(src_ptr + x + 8),
                                    vld1q_s32(src_ptr + x + 12),
                                }
                            };

                            vst1q_f32(dst_ptr + x, vcvtq_f32_s32(texels.val[0]));
                            vst1q_f32(dst_ptr + x + 4, vcvtq_f32_s32(texels.val[1]));
                            vst1q_f32(dst_ptr + x + 8, vcvtq_f32_s32(texels.val[2]));
                            vst1q_f32(dst_ptr + x + 12, vcvtq_f32_s32(texels.val[3]));
                        }

                        // Compute left-over elements
                        for(; x < window_end_x; ++x)
                        {
                            *(dst_ptr + x) = static_cast<float>(*(src_ptr + x));
                        }
                    },
                    src, dst);
                    break;
                }
                case DataType::QASYMM8_SIGNED:
                {
                    /* Down-conversion S32 -> QASYMM8_SIGNED */
                    if(ConvertPolicy::SATURATE == _policy)
                    {
                        execute_window_loop(win, [&](const Coordinates &)
                        {
                            const auto src_ptr = reinterpret_cast<const int32_t *>(src.ptr());
                            const auto dst_ptr = reinterpret_cast<int8_t *>(dst.ptr());

                            int x = window_start_x;
                            for(; x <= (window_end_x - window_step_x); x += window_step_x)
                            {
                                const int32x4x4_t texels =
                                {
                                    {
                                        vld1q_s32(src_ptr + x),
                                        vld1q_s32(src_ptr + x + 4),
                                        vld1q_s32(src_ptr + x + 8),
                                        vld1q_s32(src_ptr + x + 12),
                                    }
                                };
                                vst1_s8(dst_ptr + x, vqmovn_s16(vcombine_s16(vqmovn_s32(texels.val[0]), vqmovn_s32(texels.val[1]))));
                                vst1_s8(dst_ptr + x + 8, vqmovn_s16(vcombine_s16(vqmovn_s32(texels.val[2]), vqmovn_s32(texels.val[3]))));
                            }

                            // Compute left-over elements
                            for(; x < window_end_x; ++x)
                            {
                                *(dst_ptr + x) = utils::cast::saturate_cast<int8_t>(*(src_ptr + x));
                            }
                        },
                        src, dst);
                    }
                    else
                    {
                        execute_window_loop(win, [&](const Coordinates &)
                        {
                            const auto src_ptr = reinterpret_cast<const int32_t *>(src.ptr());
                            const auto dst_ptr = reinterpret_cast<int8_t *>(dst.ptr());

                            int x = window_start_x;
                            for(; x <= (window_end_x - window_step_x); x += window_step_x)
                            {
                                const int32x4x4_t texels =
                                {
                                    {
                                        vld1q_s32(src_ptr + x),
                                        vld1q_s32(src_ptr + x + 4),
                                        vld1q_s32(src_ptr + x + 8),
                                        vld1q_s32(src_ptr + x + 12)
                                    }
                                };

                                vst1_s8(dst_ptr + x, vmovn_s16(vcombine_s16(vmovn_s32(texels.val[0]), vmovn_s32(texels.val[1]))));
                                vst1_s8(dst_ptr + x + 8, vmovn_s16(vcombine_s16(vmovn_s32(texels.val[2]), vmovn_s32(texels.val[3]))));
                            }

                            // Compute left-over elements
                            for(; x < window_end_x; ++x)
                            {
                                *(dst_ptr + x) = static_cast<int8_t>(*(src_ptr + x));
                            }
                        },
                        src, dst);
                    }
                    break;
                }
                case DataType::QASYMM8:
                case DataType::U8:
                {
                    /* Down-conversion S32 -> U8 */
                    if(ConvertPolicy::SATURATE == _policy)
                    {
                        execute_window_loop(win, [&](const Coordinates &)
                        {
                            const auto src_ptr = reinterpret_cast<const int32_t *>(src.ptr());
                            const auto dst_ptr = reinterpret_cast<uint8_t *>(dst.ptr());

                            int x = window_start_x;
                            for(; x <= (window_end_x - window_step_x); x += window_step_x)
                            {
                                const int32x4x4_t texels =
                                {
                                    {
                                        vld1q_s32(src_ptr + x),
                                        vld1q_s32(src_ptr + x + 4),
                                        vld1q_s32(src_ptr + x + 8),
                                        vld1q_s32(src_ptr + x + 12)
                                    }
                                };
                                vst1_u8(dst_ptr + x, vqmovn_u16(vcombine_u16(vqmovun_s32(texels.val[0]), vqmovun_s32(texels.val[1]))));
                                vst1_u8(dst_ptr + x + 8, vqmovn_u16(vcombine_u16(vqmovun_s32(texels.val[2]), vqmovun_s32(texels.val[3]))));
                            }

                            // Compute left-over elements
                            for(; x < window_end_x; ++x)
                            {
                                *(dst_ptr + x) = utils::cast::saturate_cast<uint8_t>(*(src_ptr + x));
                            }
                        },
                        src, dst);
                    }
                    else
                    {
                        execute_window_loop(win, [&](const Coordinates &)
                        {
                            const auto src_ptr = reinterpret_cast<const int32_t *>(src.ptr());
                            const auto dst_ptr = reinterpret_cast<uint8_t *>(dst.ptr());

                            int x = window_start_x;
                            for(; x <= (window_end_x - window_step_x); x += window_step_x)
                            {
                                const int32x4x4_t texels =
                                {
                                    {
                                        vld1q_s32(src_ptr + x),
                                        vld1q_s32(src_ptr + x + 4),
                                        vld1q_s32(src_ptr + x + 8),
                                        vld1q_s32(src_ptr + x + 12)
                                    }
                                };

                                vst1_u8(dst_ptr + x, vmovn_u16(vcombine_u16(vmovn_u32(vreinterpretq_u32_s32(texels.val[0])), vmovn_u32(vreinterpretq_u32_s32(texels.val[1])))));
                                vst1_u8(dst_ptr + x + 8, vmovn_u16(vcombine_u16(vmovn_u32(vreinterpretq_u32_s32(texels.val[2])), vmovn_u32(vreinterpretq_u32_s32(texels.val[3])))));
                            }

                            // Compute left-over elements
                            for(; x < window_end_x; ++x)
                            {
                                *(dst_ptr + x) = static_cast<uint8_t>(*(src_ptr + x));
                            }
                        },
                        src, dst);
                    }
                    break;
                }
                default:
                    ARM_COMPUTE_ERROR("dst data type not supported");
            }
            break;
        default:
            ARM_COMPUTE_ERROR("Not supported");
    }
}

const char *CpuCastKernel::name() const
{
    return "CpuCastKernel.cpp";
}

const std::vector<CpuCastKernel::CastKernel> &CpuCastKernel::get_available_kernels()
{
    return available_kernels;
}

} // namespace kernels
} // namespace cpu
} // namespace arm_compute