/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.

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. */

#pragma once

#include "paddle/math/MathFunctions.h"
#include "paddle/parameter/Parameter.h"
#include "paddle/parameter/Weight.h"

namespace paddle {

class MKLPackedWeight {
protected:
  real *weight_;
  real *packedWeight_;
  size_t height_;
  size_t width_;
  bool transW_;

public:
  MKLPackedWeight(MatrixPtr weight, bool transW = false) {
    packedWeight_ = nullptr;
    weight_ = weight->getData();
    height_ = weight->getHeight();
    width_ = weight->getWidth();
    transW_ = transW;
  }

  ~MKLPackedWeight() { free_(); }

  void pack() { pack_(weight_); }

  void compute(MatrixPtr dst, MatrixPtr src) {
    cblas_sgemm_compute(CblasRowMajor,
                        CblasNoTrans,
                        CblasPacked,
                        src->getHeight(),
                        transW_ ? height_ : width_,
                        transW_ ? width_ : height_,
                        src->getData(),
                        src->getWidth(),
                        packedWeight_,
                        width_,
                        1.0,
                        dst->getData(),
                        dst->getWidth());
  }

  void compute(size_t M, real *A, size_t lda, real *C, size_t ldc) {
    cblas_sgemm_compute(CblasRowMajor,
                        CblasNoTrans,
                        CblasPacked,
                        M,
                        width_,
                        height_,
                        A,
                        lda,
                        packedWeight_,
                        width_,
                        1.0,
                        C,
                        ldc);
  }

protected:
  void pack_(real *src) {
    if (!packedWeight_) {
      packedWeight_ = cblas_sgemm_alloc(CblasBMatrix, 1, width_, height_);
    }
    cblas_sgemm_pack(CblasRowMajor,
                     CblasBMatrix,
                     transW_ ? CblasTrans : CblasNoTrans,
                     1,
                     transW_ ? height_ : width_,
                     transW_ ? width_ : height_,
                     1.0,
                     src,
                     width_,
                     packedWeight_);
  }

  void free_() {
    if (packedWeight_) {
      cblas_sgemm_free(packedWeight_);
    }
  }
};

}  // namespace paddle