/*
 Copyright (c) 2011, Intel Corporation. All rights reserved.

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 are permitted provided that the following conditions are met:

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   list of conditions and the following disclaimer.
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   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.
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   be used to endorse or promote products derived from this software without
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 ********************************************************************************
 *   Content : Eigen bindings to Intel(R) MKL
 *    Householder QR decomposition of a matrix w/o pivoting based on
 *    LAPACKE_?geqrf function.
 ********************************************************************************
*/

#ifndef EIGEN_QR_MKL_H
#define EIGEN_QR_MKL_H

#include "../Core/util/MKL_support.h"

namespace Eigen { 

  namespace internal {

    /** \internal Specialization for the data types supported by MKL */

#define EIGEN_MKL_QR_NOPIV(EIGTYPE, MKLTYPE, MKLPREFIX) \
template<typename MatrixQR, typename HCoeffs> \
struct householder_qr_inplace_blocked<MatrixQR, HCoeffs, EIGTYPE, true> \
{ \
  static void run(MatrixQR& mat, HCoeffs& hCoeffs, \
      typename MatrixQR::Index = 32, \
      typename MatrixQR::Scalar* = 0) \
  { \
    lapack_int m = (lapack_int) mat.rows(); \
    lapack_int n = (lapack_int) mat.cols(); \
    lapack_int lda = (lapack_int) mat.outerStride(); \
    lapack_int matrix_order = (MatrixQR::IsRowMajor) ? LAPACK_ROW_MAJOR : LAPACK_COL_MAJOR; \
    LAPACKE_##MKLPREFIX##geqrf( matrix_order, m, n, (MKLTYPE*)mat.data(), lda, (MKLTYPE*)hCoeffs.data()); \
    hCoeffs.adjointInPlace(); \
  } \
};

EIGEN_MKL_QR_NOPIV(double, double, d)
EIGEN_MKL_QR_NOPIV(float, float, s)
EIGEN_MKL_QR_NOPIV(dcomplex, MKL_Complex16, z)
EIGEN_MKL_QR_NOPIV(scomplex, MKL_Complex8, c)

} // end namespace internal

} // end namespace Eigen

#endif // EIGEN_QR_MKL_H
