megenginelite-sys 1.8.2

/**
 * \file dnn/src/fallback/split/opr_impl.cpp
 * MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
 *
 * Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT ARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 */
#include "src/fallback/split/opr_impl.h"

#include <cstring>
#include <numeric>
#include "src/common/utils.h"
#include "src/naive/handle.h"

namespace megdnn {
namespace fallback {
namespace split {

void exec_generic(
        const TensorND& src, const TensorNDArray& dsts, size_t A, size_t B, size_t C,
        size_t* Bv) {
    rep(a, A) {
        size_t b = 0u;
        rep(i, dsts.size()) {
            auto sptr = src.ptr<dt_float32>() + (a * B + b) * C;
            auto dptr = dsts[i].ptr<dt_float32>() + a * Bv[i] * C;
            std::memcpy(dptr, sptr, sizeof(float) * (Bv[i] * C));
            b += Bv[i];
        }
    }
}

}  // namespace split
}  // namespace fallback
}  // namespace megdnn

namespace megdnn {
namespace fallback {

void SplitImpl::exec(
        _megdnn_tensor_in src, _megdnn_out const TensorNDArray& dsts,
        _megdnn_workspace workspace) {
    auto dsts_layout = apply_vector<TensorLayout>(m_get_layout, dsts);
    auto dsts_shape = apply_vector<TensorShape>(m_get_shape, dsts_layout);
    check_exec(src.layout, dsts_layout, workspace.size);
    size_t* Bv = reinterpret_cast<size_t*>(workspace.raw_ptr);
    size_t A, B, C;
    get_ABC(dsts_shape, A, Bv, C);
    B = std::accumulate(Bv, Bv + dsts.size(), 0u);
    MEGDNN_DISPATCH_CPU_KERN_OPR(split::exec_generic(src, dsts, A, B, C, Bv));
}

}  // namespace fallback
}  // namespace megdnn

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