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!-------------------------------------------------------------------------------
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! Copyright (c) 2016 Peter Grünberg Institut, Forschungszentrum Jülich, Germany
! This file is part of FLEUR and available as free software under the conditions
! of the MIT license as expressed in the LICENSE file in more detail.
!--------------------------------------------------------------------------------
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MODULE m_elpa
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CONTAINS
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  SUBROUTINE elpa_diag(hmat,smat,ne,eig,ev)
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    !
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    !----------------------------------------------------
    !- Parallel eigensystem solver - driver routine based on chani; dw'12
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    !  Uses the ELPA for the actual diagonalization
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    !
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    !
    ! hmat ..... Hamiltonian matrix
    ! smat ..... overlap matrix
    ! ne ....... number of ev's searched (and found) on this node
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    !            On input, overall number of ev's searched,
    !            On output, local number of ev's found
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    ! eig ...... all eigenvalues, output
    ! ev ....... local eigenvectors, output
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    !
    !----------------------------------------------------

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#include"cpp_double.h"
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    USE m_juDFT
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    USE m_types_mpimat
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    USE m_types_mat
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#ifdef CPP_ELPA  
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    USE elpa1
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#ifdef CPP_ELPA2
    USE elpa2
#endif
#ifdef CPP_ELPA_201705003    
    USE elpa
#endif
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#endif
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    IMPLICIT NONE
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    CLASS(t_mat),INTENT(INOUT)    :: hmat,smat
    CLASS(t_mat),ALLOCATABLE,INTENT(OUT)::ev
    REAL,INTENT(out)              :: eig(:)
    INTEGER,INTENT(INOUT)         :: ne
    
#ifdef CPP_ELPA  
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    INCLUDE 'mpif.h'
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    !...  Local variables
    !
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    INTEGER           :: num,num2
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    INTEGER           :: nb, myid, np
    INTEGER           :: n_col, n_row
    LOGICAL           :: ok
    INTEGER           :: err
    INTEGER           :: mpi_comm_rows,mpi_comm_cols
    INTEGER           :: i,k
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    ! large distributed Matrices
    REAL,ALLOCATABLE     :: eig2(:)
    TYPE(t_mpimat)       :: ev_dist
    REAL,ALLOCATABLE     :: tmp2_r(:,:)
    COMPLEX,ALLOCATABLE  :: tmp2_c(:,:)
    INTEGER, EXTERNAL    :: numroc, indxl2g  !SCALAPACK functions
#ifdef CPP_ELPA_201705003    
    INTEGER :: kernel
    CLASS(elpa_t),pointer :: elpa_obj
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    err = elpa_init(20170403)
    elpa_obj => elpa_allocate()
#endif
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    SELECT TYPE(hmat)
    TYPE IS (t_mpimat)
    SELECT TYPE(smat)
    TYPE IS (t_mpimat)
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    CALL MPI_BARRIER(hmat%blacsdata%mpi_com,err)    
    CALL MPI_COMM_RANK(hmat%blacsdata%mpi_com,myid,err)
    CALL MPI_COMM_SIZE(hmat%blacsdata%mpi_com,np,err)
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    !Create communicators for ELPA
#if defined (CPP_ELPA_201705003)
    mpi_comm_rows = -1
    mpi_comm_cols = -1
#elif defined (CPP_ELPA_201605004) || defined (CPP_ELPA_201605003)||defined(CPP_ELPA_NEW)
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    err=get_elpa_row_col_comms(hmat%blacsdata%mpi_com, hmat%blacsdata%myrow, hmat%blacsdata%mycol,mpi_comm_rows, mpi_comm_cols)
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#else
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    CALL get_elpa_row_col_comms(hmat%blacsdata%mpi_com, hmat%blacsdata%myrow, hmat%blacsdata%mycol,mpi_comm_rows, mpi_comm_cols)
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#endif

    num2=ne !no of states solved for
    
    ALLOCATE ( eig2(hmat%global_size1), stat=err ) ! The eigenvalue array for ScaLAPACK
    IF (err.NE.0) CALL juDFT_error('Failed to allocated "eig2"', calledby ='elpa')

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    CALL ev_dist%init(hmat)! Eigenvectors for ScaLAPACK
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    IF (err.NE.0) CALL juDFT_error('Failed to allocated "ev_dist"',calledby ='elpa')

    IF (hmat%l_real) THEN
       ALLOCATE ( tmp2_r(hmat%matsize1,hmat%matsize2), stat=err ) ! tmp_array
    ELSE
       ALLOCATE ( tmp2_c(hmat%matsize1,hmat%matsize2), stat=err ) ! tmp_array
    ENDIF
    IF (err.NE.0) CALL juDFT_error('Failed to allocated "tmp2"', calledby ='elpa')

    
    
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    nb=hmat%blacsdata%blacs_desc(5)! Blocking factor
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    IF (nb.NE.hmat%blacsdata%blacs_desc(6)) CALL judft_error("Different block sizes for rows/columns not supported")
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#ifdef CPP_ELPA_201705003    
    CALL elpa_obj%set("na", hmat%global_size1, err)
    CALL elpa_obj%set("nev", num2, err)
    CALL elpa_obj%set("local_nrows", hmat%matsize1, err)
    CALL elpa_obj%set("local_ncols", hmat%matsize2, err)
    CALL elpa_obj%set("nblk", nb, err)
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    CALL elpa_obj%set("mpi_comm_parent", hmat%blacsdata%mpi_com, err)
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    CALL elpa_obj%set("process_row", hmat%blacsdata%myrow, err)
    CALL elpa_obj%set("process_col", hmat%blacsdata%mycol, err)
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#ifdef CPP_ELPA2
    CALL elpa_obj%set("solver", ELPA_SOLVER_2STAGE)
#else
    CALL elpa_obj%set("solver", ELPA_SOLVER_1STAGE)
#endif
    err = elpa_obj%setup()
    if (myid == 0) then
       call elpa_obj%get("complex_kernel", kernel)
        print *, "elpa uses " // elpa_int_value_to_string("complex_kernel", kernel) // " kernel"
    endif
#endif
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    ! Solve generalized problem
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    !
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    ! 1. Calculate Cholesky factorization of Matrix S = U**T * U
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    !    and invert triangular matrix U.
    !    Cholesky factorization: 
    !         Only upper triangle needs to be set. On return, the upper triangle contains
    !         the Cholesky factor and the lower triangle is set to 0.
    !    invert_triangular:
    !         Inverts an upper triangular real or complex matrix.
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    !
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    ! Please note: cholesky_complex/invert_trm_complex are not trimmed for speed.
    ! The only reason having them is that the Scalapack counterpart
    ! PDPOTRF very often fails on higher processor numbers for unknown reasons!

#if defined(CPP_ELPA_201705003)
    IF (hmat%l_real) THEN
       CALL elpa_obj%cholesky(smat%data_r, err)
       CALL elpa_obj%invert_triangular(smat%data_r, err)
    ELSE
       CALL elpa_obj%cholesky(smat%data_c, err)
       CALL elpa_obj%invert_triangular(smat%data_c, err)
    ENDIF
#elif defined(CPP_ELPA_201605003) || defined(CPP_ELPA_201605004)
    IF (hmat%l_real) THEN
       ok=cholesky_real(smat%global_size1,smat%data_r,smat%matsize1,nb,smat%matsize2,mpi_comm_rows,mpi_comm_cols,.false.)
       ok=invert_trm_real(smat%global_size1,smat%data_r,smat%matsize1,nb,smat%matsize2,mpi_comm_rows,mpi_comm_cols,.false.)
    ELSE
       ok=cholesky_complex(smat%global_size1,smat%data_c,smat%matsize1,nb,smat%matsize2,mpi_comm_rows,mpi_comm_cols,.false.)
       ok=invert_trm_complex(smat%global_size1,smat%data_c,smat%matsize1,nb,smat%matsize2,mpi_comm_rows,mpi_comm_cols,.false.)
    ENDIF
#elif defined CPP_ELPA_NEW
    IF (hmat%l_real) THEN
       CALL cholesky_real(smat%global_size1,smat%data_r,smat%matsize1,nb,smat%matsize2,mpi_comm_rows,mpi_comm_cols,.false., ok)
       CALL invert_trm_real(smat%global_size1,smat%data_r,smat%matsize1,nb,smat%matsize2,mpi_comm_rows,mpi_comm_cols,.false., ok)
    ELSE
       CALL cholesky_complex(smat%global_size1,smat%data_c,smat%matsize1,nb,smat%matsize2,mpi_comm_rows,mpi_comm_cols,.false.,ok)
       CALL invert_trm_complex(smat%global_size1,smat%data_c,smat%matsize1,nb,smat%matsize2,mpi_comm_rows,mpi_comm_cols,.false.,ok)
    ENDIF
#else
    IF (hmat%l_real) THEN
       CALL cholesky_real(smat%global_size1,smat%data_r,smat%matsize1,nb,mpi_comm_rows,mpi_comm_cols,.false.)
       CALL invert_trm_real(smat%global_size1,smat%data_r,smat%matsize1,nb,mpi_comm_rows,mpi_comm_cols,.false.)
    ELSE
       CALL cholesky_complex(smat%global_size1,smat%data_c,smat%matsize1,nb,smat%matsize2,mpi_comm_rows,mpi_comm_cols,.false.)
       CALL invert_trm_complex(smat%global_size1,smat%data_c,smat%matsize1,nb,smat%matsize2,mpi_comm_rows,mpi_comm_cols,.false.)
    ENDIF
#endif

    ! 2. Calculate U**-T * H * U**-1

    ! 2a. ev_dist = U**-T * H

    ! H is only set in the upper half, solve_evp_real needs a full matrix
    ! Set lower half from upper half

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    ! Set the lower half of the H matrix to zeros.
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    DO i=1,hmat%matsize2
       ! Get global column corresponding to i and number of local rows up to
       ! and including the diagonal, these are unchanged in H
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       n_col = indxl2g(i,     nb, hmat%blacsdata%mycol, 0, hmat%blacsdata%npcol)
       n_row = numroc (n_col, nb, hmat%blacsdata%myrow, 0, hmat%blacsdata%nprow)
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       IF (hmat%l_real) THEN
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          hmat%data_r(n_row+1:hmat%matsize1,i) = 0.0 
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       ELSE
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          hmat%data_c(n_row+1:hmat%matsize1,i) = 0.0
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       ENDIF
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    ENDDO
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    ! Use the ev_dist array to store the calculated values for the lower part.
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    IF (hmat%l_real) THEN
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       CALL pdtran(hmat%global_size1,hmat%global_size1,1.0,hmat%data_r,1,1,&
                         hmat%blacsdata%blacs_desc,0.0,ev_dist%data_r,1,1,ev_dist%blacsdata%blacs_desc)
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    ELSE
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       CALL pztranc(hmat%global_size1,hmat%global_size2,cmplx(1.0,0.0),hmat%data_c,1,1,&
                         hmat%blacsdata%blacs_desc,cmplx(0.0,0.0),ev_dist%data_c,1,1,ev_dist%blacsdata%blacs_desc)
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    ENDIF

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    ! Copy the calculated values to the lower part of the H matrix
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    DO i=1,hmat%matsize2
       ! Get global column corresponding to i and number of local rows up to
       ! and including the diagonal, these are unchanged in H
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       n_col = indxl2g(i,     nb, hmat%blacsdata%mycol, 0, hmat%blacsdata%npcol)
       n_row = numroc (n_col, nb, hmat%blacsdata%myrow, 0, hmat%blacsdata%nprow)
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       IF (hmat%l_real) THEN
          hmat%data_r(n_row+1:hmat%matsize1,i) = ev_dist%data_r(n_row+1:ev_dist%matsize1,i)
       ELSE
          hmat%data_c(n_row+1:hmat%matsize1,i) = ev_dist%data_c(n_row+1:ev_dist%matsize1,i)
       ENDIF
    ENDDO
 

#if defined (CPP_ELPA_201705003)
    IF (hmat%l_real) THEN
       CALL elpa_obj%hermitian_multiply('U','L',hmat%global_size1,smat%data_r,hmat%data_r,&
                     smat%matsize1,smat%matsize2,ev_dist%data_r,hmat%matsize1,hmat%matsize2,err)
    ELSE
       CALL elpa_obj%hermitian_multiply('U','L',hmat%global_size1,smat%data_c,hmat%data_c,&
                     smat%matsize1,smat%matsize2,ev_dist%data_c,hmat%matsize1,hmat%matsize2,err)
    ENDIF
#elif defined (CPP_ELPA_201605004)
    IF (hmat%l_real) THEN
       ok=elpa_mult_at_b_real('U', 'L',hmat%global_size1,hmat%global_size1,smat%data_r,smat%matsize1,smat%matsize2,&
                     hmat%data_r,hmat%matsize1,hmat%matsize2,nb,mpi_comm_rows, mpi_comm_cols,&
                     ev_dist%data_r,ev_dist%matsize1,ev_dist%matsize2)
    ELSE
       ok=mult_ah_b_complex('U', 'L',hmat%global_size1,hmat%global_size1,smat%data_c,smat%matsize1,smat%matsize2,&
                     hmat%data_c,hmat%matsize1,hmat%matsize2,nb,mpi_comm_rows, mpi_comm_cols,&
                     ev_dist%data_c,ev_dist%matsize1,ev_dist%matsize2)
    ENDIF
#elif defined (CPP_ELPA_201605003)
    IF (hmat%l_real) THEN
       ok=mult_at_b_real('U', 'L',hmat%global_size1,hmat%global_size1,smat%data_r,smat%matsize1,&
                     hmat%data_r,hmat%matsize1,nb,mpi_comm_rows, mpi_comm_cols,ev_dist%data_r,ev_dist%matsize1)
    ELSE
       ok=mult_ah_b_complex('U', 'L',hmat%global_size1,hmat%global_size1,smat%data_c,smat%matsize1,&
                     hmat%data_c,hmat%matsize1,nb,mpi_comm_rows, mpi_comm_cols,ev_dist%data_c,ev_dist%matsize1)
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    ENDIF
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#else
    IF (hmat%l_real) THEN
       CALL mult_at_b_real('U', 'L',hmat%global_size1,hmat%global_size1,smat%data_r,smat%matsize1,&
                     hmat%data_r,hmat%matsize1,nb,mpi_comm_rows, mpi_comm_cols,ev_dist%data_r,ev_dist%matsize1)
    ELSE
       CALL mult_ah_b_complex('U', 'L',hmat%global_size1,hmat%global_size1,smat%data_c,smat%matsize1,&
                     hmat%data_c,hmat%matsize1,nb,mpi_comm_rows, mpi_comm_cols,ev_dist%data_c,ev_dist%matsize1)
    ENDIF
#endif
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    ! 2b. tmp2 = ev_dist**T
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    IF (hmat%l_real) THEN
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       CALL pdtran(ev_dist%global_size1,ev_dist%global_size1,1.0,ev_dist%data_r,1,1,&
                          ev_dist%blacsdata%blacs_desc,0.0,tmp2_r,1,1,ev_dist%blacsdata%blacs_desc)
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    ELSE
       CALL pztranc(ev_dist%global_size1,ev_dist%global_size1,cmplx(1.0,0.0),ev_dist%data_c,1,1,&
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                          ev_dist%blacsdata%blacs_desc,cmplx(0.0,0.0),tmp2_c,1,1,ev_dist%blacsdata%blacs_desc)
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    ENDIF

    ! 2c. A =  U**-T * tmp2 ( = U**-T * Aorig * U**-1 )
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#if defined (CPP_ELPA_201705003)
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    IF (hmat%l_real) THEN
       CALL elpa_obj%hermitian_multiply('U','U',smat%global_size1,smat%data_r,tmp2_r,&
                     smat%matsize1,smat%matsize2,hmat%data_r,hmat%matsize1,hmat%matsize2,err)
    ELSE
       CALL elpa_obj%hermitian_multiply('U','U',smat%global_size1,smat%data_c,tmp2_c,&
                     smat%matsize1,smat%matsize2,hmat%data_c,hmat%matsize1,hmat%matsize2,err)
    ENDIF
#elif defined (CPP_ELPA_201605004)
    IF (hmat%l_real) THEN
       ok=elpa_mult_at_b_real('U', 'U',smat%global_size1,smat%global_size1,smat%data_r,smat%matsize1,smat%matsize2,&
                     tmp2_r,SIZE(tmp2_r,1),SIZE(tmp2_r,2),nb,mpi_comm_rows, mpi_comm_cols,&
                     hmat%data_r,hmat%matsize1,hmat%matsize2)
    ELSE
       ok=mult_ah_b_complex('U', 'U',smat%global_size1,smat%global_size1,smat%data_c,smat%matsize1,smat%matsize2,&
                     tmp2_c,SIZE(tmp2_c,1),SIZE(tmp2_c,2),nb,mpi_comm_rows, mpi_comm_cols,&
                     hmat%data_c,hmat%matsize1,hmat%matsize2)
    ENDIF
#elif defined (CPP_ELPA_201605003)
    IF (hmat%l_real) THEN
       ok=mult_at_b_real('U', 'U',smat%global_size1,smat%global_size1,smat%data_r,smat%matsize1,&
                     tmp2_r,SIZE(tmp2_r,1),nb,mpi_comm_rows, mpi_comm_cols,hmat%data_r,hmat%matsize1)
    ELSE
       ok=mult_ah_b_complex('U', 'U',smat%global_size1,smat%global_size1,smat%data_c,smat%matsize1,&
                     tmp2_c,SIZE(tmp2_c,1),nb,mpi_comm_rows, mpi_comm_cols,hmat%data_c,hmat%matsize1)
    ENDIF
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#else
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    IF (hmat%l_real) THEN
       CALL mult_at_b_real('U', 'U',smat%global_size1,smat%global_size1,smat%data_r,smat%matsize1,&
                     tmp2_r,SIZE(tmp2_r,1),nb,mpi_comm_rows, mpi_comm_cols,hmat%data_r,hmat%matsize1)
    ELSE
       CALL mult_ah_b_complex('U', 'U',smat%global_size1,smat%global_size1,smat%data_c,smat%matsize1,&
                     tmp2_c,SIZE(tmp2_c,1),nb,mpi_comm_rows, mpi_comm_cols,hmat%data_c,hmat%matsize1)
    ENDIF
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#endif
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    ! A is only set in the upper half, solve_evp_real needs a full matrix
    ! Set lower half from upper half

    IF (hmat%l_real) THEN
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       CALL pdtran(hmat%global_size1,hmat%global_size1,1.0,hmat%data_r,1,1,&
                          hmat%blacsdata%blacs_desc,0.0,ev_dist%data_r,1,1,ev_dist%blacsdata%blacs_desc)
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    ELSE
       CALL pztranc(hmat%global_size1,hmat%global_size1,cmplx(1.0,0.0),hmat%data_c,1,1,&
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                          hmat%blacsdata%blacs_desc,cmplx(0.0,0.0),ev_dist%data_c,1,1,ev_dist%blacsdata%blacs_desc)
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    ENDIF


    DO i=1,hmat%matsize2
       ! Get global column corresponding to i and number of local rows up to
       ! and including the diagonal, these are unchanged in A
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       n_col = indxl2g(i,     nb, hmat%blacsdata%mycol, 0, hmat%blacsdata%npcol)
       n_row = numroc (n_col, nb, hmat%blacsdata%myrow, 0, hmat%blacsdata%nprow)
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       IF (hmat%l_real) THEN
          hmat%data_r(n_row+1:hmat%matsize1,i) = ev_dist%data_r(n_row+1:ev_dist%matsize1,i)
       ELSE
          hmat%data_c(n_row+1:hmat%matsize1,i) = ev_dist%data_c(n_row+1:ev_dist%matsize1,i)
       ENDIF
    ENDDO
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    ! 3. Calculate eigenvalues/eigenvectors of U**-T * A * U**-1
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    !    Eigenvectors go to ev_dist
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#if defined (CPP_ELPA_201705003)
    IF (hmat%l_real) THEN
       CALL elpa_obj%eigenvectors(hmat%data_r, eig2, ev_dist%data_r, err)
    ELSE
       CALL elpa_obj%eigenvectors(hmat%data_c, eig2, ev_dist%data_c, err)
    ENDIF
#elif defined(CPP_ELPA_201605003) || defined(CPP_ELPA_201605004)
#ifdef CPP_ELPA2
    IF (hmat%l_real) THEN
       ok=solve_evp_real_2stage(hmat%global_size1,num2,hmat%data_r,hmat%matsize1,&
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             eig2,ev_dist%data_r,ev_dist%matsize1, nb,ev_dist%matsize2, mpi_comm_rows, mpi_comm_cols,hmat%blacsdata%mpi_com)
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    ELSE
       ok=solve_evp_complex_2stage(hmat%global_size1,num2,hmat%data_c,hmat%matsize1,&
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             eig2,ev_dist%data_c,ev_dist%matsize1, nb,ev_dist%matsize2, mpi_comm_rows, mpi_comm_cols,hmat%blacsdata%mpi_com)
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    ENDIF
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#else
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    IF (hmat%l_real) THEN
       ok=solve_evp_real_1stage(hmat%global_size1,num2,hmat%data_r,hmat%matsize1,&
             eig2,ev_dist%data_r,ev_dist%matsize1, nb,ev_dist%matsize2, mpi_comm_rows, mpi_comm_cols)
    ELSE
       ok=solve_evp_complex_1stage(hmat%global_size1,num2,hmat%data_c,hmat%matsize1,&
             eig2,ev_dist%data_c,ev_dist%matsize1, nb,ev_dist%matsize2, mpi_comm_rows, mpi_comm_cols)
    ENDIF
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#endif
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#elif defined CPP_ELPA_NEW
#ifdef CPP_ELPA2
    IF (hmat%l_real) THEN
       err=solve_evp_real_2stage(hmat%global_size1,num2,hmat%data_r,hmat%matsize1,&
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             eig2,ev_dist%data_r,ev_dist%matsize1, nb,ev_dist%matsize2, mpi_comm_rows, mpi_comm_cols,hmat%blacsdata%mpi_com)
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    ELSE
       err=solve_evp_complex_2stage(hmat%global_size1,num2,hmat%data_c,hmat%matsize1,&
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             eig2,ev_dist%data_c,ev_dist%matsize1, nb,ev_dist%matsize2, mpi_comm_rows, mpi_comm_cols,hmat%blacsdata%mpi_com)
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    ENDIF
#else
    IF (hmat%l_real) THEN
       err=solve_evp_real_1stage(hmat%global_size1,num2,hmat%data_r,hmat%matsize1,&
             eig2,ev_dist%data_r,ev_dist%matsize1, nb,ev_dist%matsize2, mpi_comm_rows, mpi_comm_cols)
    ELSE
       err=solve_evp_complex_1stage(hmat%global_size1,num2,hmat%data_c,hmat%matsize1,&
             eig2,ev_dist%data_c,ev_dist%matsize1, nb,ev_dist%matsize2, mpi_comm_rows, mpi_comm_cols)
    ENDIF
#endif
#else
#ifdef CPP_ELPA2
    IF (hmat%l_real) THEN
       CALL solve_evp_real_2stage(hmat%global_size1,num2,hmat%data_r,hmat%matsize1,&
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             eig2,ev_dist%data_r,ev_dist%matsize1, nb, mpi_comm_rows, mpi_comm_cols,hmat%blacsdata%mpi_com)
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    ELSE
       CALL solve_evp_complex_2stage(hmat%global_size1,num2,hmat%data_c,hmat%matsize1,&
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             eig2,ev_dist%data_c,ev_dist%matsize1, nb, mpi_comm_rows, mpi_comm_cols,hmat%blacsdata%mpi_com)
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    ENDIF
#else
    IF (hmat%l_real) THEN
       CALL solve_evp_real(hmat%global_size1,num2,hmat%data_r,hmat%matsize1,&
             eig2,ev_dist%data_r,ev_dist%matsize1, nb,mpi_comm_rows, mpi_comm_cols)
    ELSE
       CALL solve_evp_complex(hmat%global_size1,num2,hmat%data_c,hmat%matsize1,&
             eig2,ev_dist%data_c,ev_dist%matsize1, nb,mpi_comm_rows, mpi_comm_cols)
    ENDIF
#endif
#endif

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    ! 4. Backtransform eigenvectors: Z = U**-1 * ev_dist
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    ! mult_ah_b_complex needs the transpose of U**-1, thus tmp2 = (U**-1)**T
    IF (hmat%l_real) THEN
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       CALL pdtran(smat%global_size1,smat%global_size1,1.0,smat%data_r,1,1,&
                         smat%blacsdata%blacs_desc,0.0,tmp2_r,1,1,smat%blacsdata%blacs_desc)
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    ELSE
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       CALL pztranc(smat%global_size1,smat%global_size1,cmplx(1.0,0.0),smat%data_c,1,1,&
                         smat%blacsdata%blacs_desc,cmplx(0.0,0.0),tmp2_c,1,1,smat%blacsdata%blacs_desc)
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    ENDIF

#if defined (CPP_ELPA_201705003)
    IF (hmat%l_real) THEN
       CALL elpa_obj%hermitian_multiply('L','N',num2,tmp2_r,ev_dist%data_r,&
                     ev_dist%matsize1,ev_dist%matsize2,hmat%data_r,hmat%matsize1,hmat%matsize2,err)
    ELSE
       CALL elpa_obj%hermitian_multiply('L','N',num2,tmp2_c,ev_dist%data_c,&
                     ev_dist%matsize1,ev_dist%matsize2,hmat%data_c,hmat%matsize1,hmat%matsize2,err)
    ENDIF
#elif defined (CPP_ELPA_201605004)
    IF (hmat%l_real) THEN
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       ok=elpa_mult_at_b_real('L', 'N',hmat%global_size1,num2,tmp2_r,hmat%matsize1,hmat%matsize2,&
                     ev_dist%data_r,ev_dist%matsize1,ev_dist%matsize2,nb,mpi_comm_rows, mpi_comm_cols,&
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                     hmat%data_r,hmat%matsize1,hmat%matsize2)
    ELSE
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       ok=mult_ah_b_complex('L', 'N',hmat%global_size1,num2,tmp2_c,hmat%matsize1,hmat%matsize2,&
                     ev_dist%data_c,ev_dist%matsize1,ev_dist%matsize2,nb,mpi_comm_rows, mpi_comm_cols,&
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                     hmat%data_c,hmat%matsize1,hmat%matsize2)
    ENDIF
#elif defined (CPP_ELPA_201605003)
    IF (hmat%l_real) THEN
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       ok=elpa_mult_at_b_real('L', 'N',hmat%global_size1,num2,tmp2_r,hmat%matsize1,&
                     ev_dist%data_r,ev_dist%matsize1,nb,mpi_comm_rows, mpi_comm_cols,&
                     hmat%data_r,hmat%matsize1)
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    ELSE
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       ok=mult_ah_b_complex('L', 'N',hmat%global_size1,num2,tmp2_c,hmat%matsize1,&
                     ev_dist%data_c,ev_dist%matsize1,nb,mpi_comm_rows, mpi_comm_cols,&
                     hmat%data_c,hmat%matsize1)
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    ENDIF
#else
    IF (hmat%l_real) THEN
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       CALL mult_at_b_real('L', 'N',hmat%global_size1,num2,tmp2_r,hmat%matsize1,&
                     ev_dist%data_r,ev_dist%matsize1,nb,mpi_comm_rows, mpi_comm_cols,&
                     hmat%data_r,hmat%matsize1)
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    ELSE
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       CALL mult_ah_b_complex('L', 'N',hmat%global_size1,num2,tmp2_c,hmat%matsize1,&
                     ev_dist%data_c,ev_dist%matsize1,nb,mpi_comm_rows, mpi_comm_cols,&
                     hmat%data_c,hmat%matsize1)
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    ENDIF
#endif

#if defined (CPP_ELPA_201705003)
    CALL elpa_deallocate(elpa_obj)
    CALL elpa_uninit()
#endif
    ! END of ELPA stuff
#if ( !defined (CPP_ELPA_201705003))
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    CALL MPI_COMM_FREE(mpi_comm_rows,err)
    CALL MPI_COMM_FREE(mpi_comm_cols,err)
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#endif
    !
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    !     Each process has all eigenvalues in output
    eig(:num2) = eig2(:num2)    
    DEALLOCATE(eig2)
    !
    !
    !     Redistribute eigenvectors  from ScaLAPACK distribution to each process, i.e. for
    !     process i these are eigenvectors i+1, np+i+1, 2*np+i+1...
    !     Only num=num2/np eigenvectors per process
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    !
    num=FLOOR(REAL(num2)/np)
    IF (myid.LT.num2-(num2/np)*np) num=num+1
    ne=0
    DO i=myid+1,num2,np
       ne=ne+1
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       !eig(ne)=eig2(i)
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    ENDDO
    !
    !
    ALLOCATE(t_mpimat::ev)
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    CALL ev%init(hmat%l_real,hmat%global_size1,hmat%global_size1,hmat%blacsdata%mpi_com,.FALSE.)
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    CALL ev%copy(hmat,1,1)
    CLASS DEFAULT
      call judft_error("Wrong type (1) in scalapack")
    END SELECT
    CLASS DEFAULT
      call judft_error("Wrong type (2) in scalapack")
    END SELECT

    IF (hmat%l_real) THEN
        DEALLOCATE (tmp2_r)
    ELSE
        DEALLOCATE (tmp2_c)
    ENDIF

#endif
  END SUBROUTINE elpa_diag 
END MODULE m_elpa