/*******************************************************************************
* Copyright 2018 Intel Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*******************************************************************************/

#ifndef CPU_REF_SHUFFLE_HPP
#define CPU_REF_SHUFFLE_HPP

#include <assert.h>

#include "c_types_map.hpp"
#include "type_helpers.hpp"
#include "utils.hpp"

#include "cpu_shuffle_pd.hpp"
#include "cpu_primitive.hpp"

namespace mkldnn {
namespace impl {
namespace cpu {

template<int data_type_size>
struct ref_shuffle_t : public cpu_primitive_t {
    using shuffle_class = ref_shuffle_t<data_type_size>;

    struct pd_t: public cpu_shuffle_pd_t {
        using cpu_shuffle_pd_t::cpu_shuffle_pd_t;

        DECLARE_COMMON_PD_T("ref:any", shuffle_class);

        status_t init() {
            using namespace format_tag;

            bool ok = true
                 && data_type_size
                    == types::data_type_size(data_md()->data_type);
            if (!ok) return status::unimplemented;

            if (ndims() == 5) {
                dat_tag_ = memory_desc_matches_one_of_tag(
                        *data_md(), nCdhw16c, nCdhw8c, ncdhw, ndhwc);
            } else if (ndims() == 4) {
                dat_tag_ = memory_desc_matches_one_of_tag(
                        *data_md(), nChw16c, nChw8c, nchw, nhwc);
            } else
                dat_tag_ = any;

            return status::success;
        }

        format_tag_t dat_tag_;
    };

    ref_shuffle_t(const pd_t *apd): cpu_primitive_t(apd) {
        const int axis_size = pd()->axis_size();
        const int group_size = pd()->group_size();
        const int transpose_row = pd()->is_fwd() ? group_size
                                                 : axis_size / group_size;
        const int transpose_col = pd()->is_fwd() ? axis_size / group_size
                                                 : group_size;
        rev_transposed_ = (int *)malloc(axis_size * sizeof(int), 64);
        parallel_nd(transpose_col, transpose_row, [&](int i, int j) {
            rev_transposed_[j * transpose_col + i] = i * transpose_row + j;
        });
    }

    ~ref_shuffle_t() { free(rev_transposed_); }

    typedef typename typesize_traits<data_type_size>::type data_t;

    virtual status_t execute(const exec_ctx_t &ctx) const override {
        using namespace format_tag;
        switch (pd()->dat_tag_) {
        case nCdhw16c: execute_<nCdhw16c>(ctx); break;
        case nChw16c:  execute_<nChw16c>(ctx); break;
        case nCdhw8c:  execute_<nCdhw8c>(ctx); break;
        case nChw8c:   execute_<nChw8c>(ctx); break;
        case ncdhw:    execute_<ncdhw>(ctx); break;
        case nchw:     execute_<nchw>(ctx); break;
        case ndhwc:    execute_<ndhwc>(ctx); break;
        case nhwc:     execute_<nhwc>(ctx); break;
        default:       execute_<any>(ctx); break;
        }
        return status::success;
    }

private:
    template<format_tag_t tag>
    void execute_(const exec_ctx_t &ctx) const;
    const pd_t *pd() const { return (const pd_t *)primitive_t::pd(); }
    int *rev_transposed_;
};

}
}
}

#endif

// vim: et ts=4 sw=4 cindent cino^=l0,\:0,N-s