/*******************************************************************************
* Copyright 2016 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_BATCH_NORMALIZATION_HPP
#define CPU_REF_BATCH_NORMALIZATION_HPP

#include <assert.h>

#include "common/c_types_map.hpp"
#include "common/primitive.hpp"
#include "common/type_helpers.hpp"
#include "common/utils.hpp"

#include "cpu/platform.hpp"

#include "cpu/cpu_batch_normalization_pd.hpp"

namespace dnnl {
namespace impl {
namespace cpu {

template <data_type_t d_type>
struct ref_batch_normalization_fwd_t : public primitive_t {
    struct pd_t : public cpu_batch_normalization_fwd_pd_t {
        using cpu_batch_normalization_fwd_pd_t::
                cpu_batch_normalization_fwd_pd_t;

        DECLARE_COMMON_PD_T("ref:any", ref_batch_normalization_fwd_t);

        status_t init(engine_t *engine) {
            using namespace data_type;
            VDISPATCH_BNORM(is_fwd(), VERBOSE_BAD_PROPKIND);
            VDISPATCH_BNORM(utils::everyone_is(d_type, src_md()->data_type,
                                    dst_md()->data_type),
                    VERBOSE_UNSUPPORTED_DT);
            VDISPATCH_BNORM(platform::has_data_type_support(d_type),
                    VERBOSE_UNSUPPORTED_DT);
            VDISPATCH_BNORM(IMPLICATION(is_training(),
                                    platform::has_training_support(d_type)),
                    VERBOSE_UNSUPPORTED_DT);
            VDISPATCH_BNORM(check_scale_shift_data_type(),
                    VERBOSE_UNSUPPORTED_FEATURE,
                    "unsupported scale or shift data type");
            VDISPATCH_BNORM((attr()->has_default_values()
                                    || with_relu_post_op(is_training())),
                    VERBOSE_UNSUPPORTED_ATTR);
            VDISPATCH_BNORM(
                    set_default_formats_common(), VERBOSE_UNSUPPORTED_TAG);
            VDISPATCH_BNORM(memory_desc_wrapper(src_md())
                            == memory_desc_wrapper(dst_md()),
                    VERBOSE_INCONSISTENT_MDS, "src", "dst");

            // BN+Add+Relu fusion is not currently implemented
            VDISPATCH_BNORM(!fuse_norm_add_relu(), VERBOSE_UNSUPPORTED_FEATURE,
                    "sum+relu post-ops configuration is not supported");

            VDISPATCH_BNORM(!(src_md()->data_type == s8 && !stats_is_src()),
                    VERBOSE_UNSUPPORTED_DT);

            if (is_training() && fuse_norm_relu()) init_default_ws(8);

            return status::success;
        }
    };

    ref_batch_normalization_fwd_t(const pd_t *apd) : primitive_t(apd) {}

    using data_t = typename prec_traits_t<d_type>::type;

    status_t execute(const exec_ctx_t &ctx) const override {
        return execute_forward(ctx);
    }

private:
    status_t execute_forward(const exec_ctx_t &ctx) const;
    const pd_t *pd() const { return (const pd_t *)primitive_t::pd().get(); }
};

template <data_type_t d_type>
struct ref_batch_normalization_bwd_t : public primitive_t {
    struct pd_t : public cpu_batch_normalization_bwd_pd_t {
        using cpu_batch_normalization_bwd_pd_t::
                cpu_batch_normalization_bwd_pd_t;

        DECLARE_COMMON_PD_T("ref:any", ref_batch_normalization_bwd_t);

        status_t init(engine_t *engine) {
            using namespace data_type;

            VDISPATCH_BNORM(!is_fwd(), VERBOSE_BAD_PROPKIND);
            VDISPATCH_BNORM(
                    utils::everyone_is(d_type, src_md()->data_type,
                            diff_dst_md()->data_type, diff_src_md()->data_type),
                    VERBOSE_UNSUPPORTED_DT);
            VDISPATCH_BNORM(platform::has_data_type_support(d_type),
                    VERBOSE_UNSUPPORTED_DT);
            VDISPATCH_BNORM(platform::has_training_support(d_type),
                    VERBOSE_UNSUPPORTED_DT);
            VDISPATCH_BNORM(check_scale_shift_data_type(),
                    VERBOSE_UNSUPPORTED_FEATURE,
                    "unsupported scale or shift data type");
            VDISPATCH_BNORM(
                    attr()->has_default_values(), VERBOSE_UNSUPPORTED_ATTR);
            VDISPATCH_BNORM(
                    set_default_formats_common(), VERBOSE_UNSUPPORTED_TAG);
            VDISPATCH_BNORM(memory_desc_wrapper(diff_src_md())
                            == memory_desc_wrapper(diff_dst_md()),
                    VERBOSE_INCONSISTENT_MDS, "diff_src", "diff_dst");

            // BN+Add+Relu fusion is not currently implemented
            VDISPATCH_BNORM(!fuse_norm_add_relu(), VERBOSE_UNSUPPORTED_FEATURE,
                    "sum+relu post-ops configuration is not supported");

            if (fuse_norm_relu()) {
                init_default_ws(8);
                VDISPATCH_BNORM(compare_ws(hint_fwd_pd_), VERBOSE_WS_MISMATCH);
            }

            return status::success;
        }
    };

    ref_batch_normalization_bwd_t(const pd_t *apd) : primitive_t(apd) {}
    using data_t = typename prec_traits_t<d_type>::type;

    status_t execute(const exec_ctx_t &ctx) const override {
        return execute_backward(ctx);
    }

private:
    status_t execute_backward(const exec_ctx_t &ctx) const;
    const pd_t *pd() const { return (const pd_t *)primitive_t::pd().get(); }
};

} // namespace cpu
} // namespace impl
} // namespace dnnl

#endif

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