HouseholderQR_MKL.h

/*
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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 "Eigen/src/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> \
void householder_qr_inplace_blocked(MatrixQR& mat, HCoeffs& hCoeffs, \
                                       typename MatrixQR::Index maxBlockSize=32, \
                                       EIGTYPE* tempData = 0) \
{ \
  lapack_int m = mat.rows(); \
  lapack_int n = mat.cols(); \
  lapack_int lda = 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