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 !    This file is part of ELPA.
!
!    The ELPA library was originally created by the ELPA consortium,
!    consisting of the following organizations:
!
!    - Max Planck Computing and Data Facility (MPCDF), formerly known as
!      Rechenzentrum Garching der Max-Planck-Gesellschaft (RZG),
!    - Bergische Universität Wuppertal, Lehrstuhl für angewandte
!      Informatik,
!    - Technische Universität München, Lehrstuhl für Informatik mit
!      Schwerpunkt Wissenschaftliches Rechnen ,
!    - Fritz-Haber-Institut, Berlin, Abt. Theorie,
!    - Max-Plack-Institut für Mathematik in den Naturwissenschaften,
!      Leipzig, Abt. Komplexe Strukutren in Biologie und Kognition,
!      and
!    - IBM Deutschland GmbH
!
!    This particular source code file contains additions, changes and
!    enhancements authored by Intel Corporation which is not part of
!    the ELPA consortium.
!
!    More information can be found here:
!    http://elpa.mpcdf.mpg.de/
!
!    ELPA is free software: you can redistribute it and/or modify
!    it under the terms of the version 3 of the license of the
!    GNU Lesser General Public License as published by the Free
!    Software Foundation.
!
!    ELPA is distributed in the hope that it will be useful,
!    but WITHOUT ANY WARRANTY; without even the implied warranty of
!    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
!    GNU Lesser General Public License for more details.
!
!    You should have received a copy of the GNU Lesser General Public License
!    along with ELPA.  If not, see <http://www.gnu.org/licenses/>
!
!    ELPA reflects a substantial effort on the part of the original
!    ELPA consortium, and we ask you to respect the spirit of the
!    license that we chose: i.e., please contribute any changes you
!    may have back to the original ELPA library distribution, and keep
!    any derivatives of ELPA under the same license that we chose for
!    the original distribution, the GNU Lesser General Public License.
!
!
! ELPA1 -- Faster replacements for ScaLAPACK symmetric eigenvalue routines
!
! Copyright of the original code rests with the authors inside the ELPA
! consortium. The copyright of any additional modifications shall rest
! with their original authors, but shall adhere to the licensing terms
! distributed along with the original code in the file "COPYING".
 function elpa_solve_evp_&
  &MATH_DATATYPE&
  &_&
  &2stage_&
  &PRECISION&
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  &_impl (obj, a, ev, q) result(success)
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   use elpa_abstract_impl
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   use elpa_utilities
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   use elpa1_compute
   use elpa2_compute
   use elpa_mpi
   use cuda_functions
   use mod_check_for_gpu
   use iso_c_binding
   implicit none
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   class(elpa_abstract_impl_t), intent(inout) :: obj
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   logical                                   :: useGPU
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#if REALCASE == 1
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   logical                                   :: useQR
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#endif
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   logical                                   :: useQRActual
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   integer(kind=c_int)                       :: bandwidth

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   integer(kind=c_int)                       :: kernel
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#ifdef USE_ASSUMED_SIZE
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   MATH_DATATYPE(kind=C_DATATYPE_KIND), intent(inout) :: a(obj%local_nrows,*), q(obj%local_nrows,*)
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#else
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   MATH_DATATYPE(kind=C_DATATYPE_KIND), intent(inout) :: a(obj%local_nrows,obj%local_ncols), &
                                                         q(obj%local_nrows,obj%local_ncols)
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#endif
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   real(kind=C_DATATYPE_KIND), intent(inout) :: ev(obj%na)
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   MATH_DATATYPE(kind=C_DATATYPE_KIND), allocatable   :: hh_trans(:,:)

   integer(kind=c_int)                       :: my_pe, n_pes, my_prow, my_pcol, np_rows, np_cols, mpierr
   integer(kind=c_int)                       :: l_cols, l_rows, l_cols_nev, nbw, num_blocks
   MATH_DATATYPE(kind=C_DATATYPE_KIND), allocatable :: tmat(:,:,:)
   real(kind=C_DATATYPE_KIND), allocatable   :: e(:)
#if COMPLEXCASE == 1
   real(kind=C_DATATYPE_KIND), allocatable   :: q_real(:,:)
#endif
   integer(kind=c_intptr_t)                  :: tmat_dev, q_dev, a_dev

   integer(kind=c_int)                       :: i
   logical                                   :: success, successCUDA
   logical                                   :: wantDebug
   integer(kind=c_int)                       :: istat
   character(200)                            :: errorMessage
   logical                                   :: do_useGPU, do_useGPU_trans_ev_tridi
   integer(kind=c_int)                       :: numberOfGPUDevices
   integer(kind=c_intptr_t), parameter       :: size_of_datatype = size_of_&
                                                                   &PRECISION&
                                                                   &_&
                                                                   &MATH_DATATYPE
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    integer(kind=ik)                         :: na, nev, lda, ldq, nblk, matrixCols, &
                                                mpi_comm_rows, mpi_comm_cols, mpi_comm_all
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    call obj%timer%start("solve_evp_&
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    &MATH_DATATYPE&
    &_2stage" // &
    &PRECISION_SUFFIX &
    )

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    na         = obj%na
    nev        = obj%nev
    lda        = obj%local_nrows
    ldq        = obj%local_nrows
    nblk       = obj%nblk
    matrixCols = obj%local_ncols

#if REALCASE == 1
    kernel  = obj%get("real_kernel")
    ! check consistency between request for GPUs and defined kernel
    if (obj%get("gpu") == 1) then
      if (kernel .ne. ELPA_2STAGE_REAL_GPU) then
        write(error_unit,*) "ELPA: Warning, GPU usage has been requested but compute kernel is defined as non-GPU!"
      else if (obj%get("nblk") .ne. 128) then
        kernel = ELPA_2STAGE_REAL_GENERIC
      endif
    endif
#endif

#if COMPLEXCASE == 1
    kernel  = obj%get("complex_kernel")
    ! check consistency between request for GPUs and defined kernel
    if (obj%get("gpu") == 1) then
      if (kernel .ne. ELPA_2STAGE_COMPLEX_GPU) then
        write(error_unit,*) "ELPA: Warning, GPU usage has been requested but compute kernel is defined as non-GPU!"
      else if (obj%get("nblk") .ne. 128) then
        kernel = ELPA_2STAGE_COMPLEX_GENERIC
      endif
    endif
#endif
    mpi_comm_rows = obj%get("mpi_comm_rows")
    mpi_comm_cols = obj%get("mpi_comm_cols")
    mpi_comm_all  = obj%get("mpi_comm_parent")

    if (obj%get("gpu") .eq. 1) then
      useGPU = .true.
    else
      useGPU = .false.
    endif

#if REALCASE == 1
    if (obj%get("qr") .eq. 1) then
      useQR = .true.
    else
      useQR = .false.
    endif

#endif
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    call obj%timer%start("mpi_communication")
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    call mpi_comm_rank(mpi_comm_all,my_pe,mpierr)
    call mpi_comm_size(mpi_comm_all,n_pes,mpierr)

    call mpi_comm_rank(mpi_comm_rows,my_prow,mpierr)
    call mpi_comm_size(mpi_comm_rows,np_rows,mpierr)
    call mpi_comm_rank(mpi_comm_cols,my_pcol,mpierr)
    call mpi_comm_size(mpi_comm_cols,np_cols,mpierr)
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    call obj%timer%stop("mpi_communication")
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    wantDebug = obj%get("debug") == 1
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    success = .true.

    do_useGPU      = .false.
    do_useGPU_trans_ev_tridi =.false.


#if REALCASE == 1
    useQRActual = .false.
    ! set usage of qr decomposition via API call
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    if (useQR) useQRActual = .true.
    if (.not.(useQR)) useQRACtual = .false.
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    if (useQRActual) then
      if (mod(na,2) .ne. 0) then
        if (wantDebug) then
          write(error_unit,*) "solve_evp_real_2stage: QR-decomposition: blocksize does not fit with matrixsize"
        endif
        print *, "Do not use QR-decomposition for this matrix and blocksize."
        success = .false.
        return
      endif
    endif
#endif /* REALCASE */

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    if (useGPU) then
      if (check_for_gpu(my_pe,numberOfGPUDevices, wantDebug=wantDebug)) then
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         do_useGPU = .true.

         ! set the neccessary parameters
         cudaMemcpyHostToDevice   = cuda_memcpyHostToDevice()
         cudaMemcpyDeviceToHost   = cuda_memcpyDeviceToHost()
         cudaMemcpyDeviceToDevice = cuda_memcpyDeviceToDevice()
         cudaHostRegisterPortable = cuda_hostRegisterPortable()
         cudaHostRegisterMapped   = cuda_hostRegisterMapped()
      else
        print *,"GPUs are requested but not detected! Aborting..."
        success = .false.
        return
      endif
    else
      ! check whether set by environment variable
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      do_useGPU = obj%get("gpu") == 1
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      if (do_useGPU) then
        if (check_for_gpu(my_pe,numberOfGPUDevices, wantDebug=wantDebug)) then
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           ! set the neccessary parameters
           cudaMemcpyHostToDevice   = cuda_memcpyHostToDevice()
           cudaMemcpyDeviceToHost   = cuda_memcpyDeviceToHost()
           cudaMemcpyDeviceToDevice = cuda_memcpyDeviceToDevice()
           cudaHostRegisterPortable = cuda_hostRegisterPortable()
           cudaHostRegisterMapped   = cuda_hostRegisterMapped()
        else
          print *,"GPUs are requested but not detected! Aborting..."
          success = .false.
          return
        endif
      endif
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    endif
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    ! check consistency between request for GPUs and defined kernel
    if (do_useGPU) then
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      if (nblk .ne. 128) then
        ! cannot run on GPU with this blocksize
        ! disable GPU usage for trans_ev_tridi
        do_useGPU_trans_ev_tridi = .false.
      else
        do_useGPU_trans_ev_tridi = .true.
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      endif
    endif

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    if (obj%is_set("bandwidth") == 1) then
      nbw=obj%get("bandwidth")
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      if ((nbw == 0) .or. (mod(nbw, nblk) .ne. 0)) then
        if (wantDebug) then
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          write(error_unit,*) "Specified bandwidth has to be a multiple of blocksize: ",nbw
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        endif
        print *, "Specified bandwidth has to be a multiple of blocksize"
        success = .false.
        return
      endif
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      !ttts = MPI_Wtime()
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    else

      ! Choose bandwidth, must be a multiple of nblk, set to a value >= 32
      ! On older systems (IBM Bluegene/P, Intel Nehalem) a value of 32 was optimal.
      ! For Intel(R) Xeon(R) E5 v2 and v3, better use 64 instead of 32!
      ! For IBM Bluegene/Q this is not clear at the moment. We have to keep an eye
      ! on this and maybe allow a run-time optimization here
      if (do_useGPU) then
        nbw = nblk
      else
#if REALCASE == 1
        nbw = (63/nblk+1)*nblk
#elif COMPLEXCASE == 1
        nbw = (31/nblk+1)*nblk
#endif
      endif

      num_blocks = (na-1)/nbw + 1

      allocate(tmat(nbw,nbw,num_blocks), stat=istat, errmsg=errorMessage)
      if (istat .ne. 0) then
        print *,"solve_evp_&
	&MATH_DATATYPE&
	&_2stage_&
	&PRECISION&
	&" // ": error when allocating tmat "//errorMessage
        stop 1
      endif

      ! Reduction full -> band
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      call obj%timer%start("bandred")
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      call bandred_&
      &MATH_DATATYPE&
      &_&
      &PRECISION &
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      (obj, na, a, &
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       a_dev, lda, nblk, nbw, matrixCols, num_blocks, mpi_comm_rows, mpi_comm_cols, tmat, &
       tmat_dev,  wantDebug, do_useGPU, success &
#if REALCASE == 1
       , useQRActual &
#endif
       )
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      call obj%timer%stop("bandred")
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      if (.not.(success)) return
    end if  ! matrix not already banded on input

     ! Reduction band -> tridiagonal

     allocate(e(na), stat=istat, errmsg=errorMessage)
     if (istat .ne. 0) then
       print *,"solve_evp_&
       &MATH_DATATYPE&
       &_2stage_&
       &PRECISION " // ": error when allocating e "//errorMessage
       stop 1
     endif

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     call obj%timer%start("tridiag")
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     call tridiag_band_&
     &MATH_DATATYPE&
     &_&
     &PRECISION&
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     (obj, na, nbw, nblk, a, a_dev, lda, ev, e, matrixCols, hh_trans, mpi_comm_rows, mpi_comm_cols, mpi_comm_all, do_useGPU)
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#ifdef WITH_MPI
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     call obj%timer%start("mpi_communication")
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     call mpi_bcast(ev, na, MPI_REAL_PRECISION, 0, mpi_comm_all, mpierr)
     call mpi_bcast(e, na, MPI_REAL_PRECISION, 0, mpi_comm_all, mpierr)
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     call obj%timer%stop("mpi_communication")
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#endif /* WITH_MPI */
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     call obj%timer%stop("tridiag")
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#if COMPLEXCASE == 1
     l_rows = local_index(na, my_prow, np_rows, nblk, -1) ! Local rows of a and q
     l_cols = local_index(na, my_pcol, np_cols, nblk, -1) ! Local columns of q
     l_cols_nev = local_index(nev, my_pcol, np_cols, nblk, -1) ! Local columns corresponding to nev

     allocate(q_real(l_rows,l_cols), stat=istat, errmsg=errorMessage)
     if (istat .ne. 0) then
       print *,"solve_evp_&
       &MATH_DATATYPE&
       &_2stage: error when allocating q_real"//errorMessage
       stop 1
     endif
#endif

     ! Solve tridiagonal system
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     call obj%timer%start("solve")
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     call solve_tridi_&
     &PRECISION &
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     (obj, na, nev, ev, e, &
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#if REALCASE == 1
     q, ldq,   &
#endif
#if COMPLEXCASE == 1
     q_real, ubound(q_real,dim=1), &
#endif
     nblk, matrixCols, mpi_comm_rows, mpi_comm_cols, wantDebug, success)
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     call obj%timer%stop("solve")
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     if (.not.(success)) return

     deallocate(e, stat=istat, errmsg=errorMessage)
     if (istat .ne. 0) then
       print *,"solve_evp_&
       &MATH_DATATYPE&
       &_2stage: error when deallocating e "//errorMessage
       stop 1
     endif

#if COMPLEXCASE == 1
     q(1:l_rows,1:l_cols_nev) = q_real(1:l_rows,1:l_cols_nev)

     deallocate(q_real, stat=istat, errmsg=errorMessage)
     if (istat .ne. 0) then
       print *,"solve_evp_&
       &MATH_DATATYPE&
       &_2stage: error when deallocating q_real"//errorMessage
       stop 1
     endif
#endif
     ! Backtransform stage 1
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     call obj%timer%start("trans_ev_to_band")

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     call trans_ev_tridi_to_band_&
     &MATH_DATATYPE&
     &_&
     &PRECISION &
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     (obj, na, nev, nblk, nbw, q, &
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     q_dev, &
     ldq, matrixCols, hh_trans, mpi_comm_rows, mpi_comm_cols, wantDebug, do_useGPU_trans_ev_tridi, &
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     success=success, kernel=kernel)
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     call obj%timer%stop("trans_ev_to_band")
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     if (.not.(success)) return

     ! We can now deallocate the stored householder vectors
     deallocate(hh_trans, stat=istat, errmsg=errorMessage)
     if (istat .ne. 0) then
       print *, "solve_evp_&
       &MATH_DATATYPE&
       &_2stage_&
       &PRECISION " // ": error when deallocating hh_trans "//errorMessage
       stop 1
     endif

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     if(obj%is_set("bandwidth") .ne. 1) then
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       if ( (do_useGPU) .and. .not.(do_useGPU_trans_ev_tridi) ) then
         ! copy to device if we want to continue on GPU
         successCUDA = cuda_malloc(q_dev, ldq*matrixCols*size_of_datatype)

         successCUDA = cuda_memcpy(q_dev, loc(q), ldq*matrixCols* size_of_datatype, cudaMemcpyHostToDevice)
       endif

       ! Backtransform stage 2
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       call obj%timer%start("trans_ev_to_full")

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       call trans_ev_band_to_full_&
       &MATH_DATATYPE&
       &_&
       &PRECISION &
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       (obj, na, nev, nblk, nbw, a, &
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        a_dev, lda, tmat, tmat_dev,  q,  &
        q_dev, &
        ldq, matrixCols, num_blocks, mpi_comm_rows, mpi_comm_cols, do_useGPU &
#if REALCASE == 1
        , useQRActual  &
#endif
        )
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       call obj%timer%stop("trans_ev_to_full")
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       deallocate(tmat, stat=istat, errmsg=errorMessage)
       if (istat .ne. 0) then
         print *,"solve_evp_&
	 &MATH_DATATYPE&
	 _2stage_&
	 &PRECISION " // ": error when deallocating tmat"//errorMessage
         stop 1
       endif
     endif

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     call obj%timer%stop("solve_evp_&
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     &MATH_DATATYPE&
     &_2stage" // &
     &PRECISION_SUFFIX &
     )
1    format(a,f10.3)

   end function elpa_solve_evp_&
   &MATH_DATATYPE&
   &_2stage_&
   &PRECISION&
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   &_impl
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! vim: syntax=fortran