!-------------------------------------- LICENCE BEGIN ------------------------------------
!Environment Canada - Atmospheric Science and Technology License/Disclaimer, 
!                     version 3; Last Modified: May 7, 2008.
!This is free but copyrighted software; you can use/redistribute/modify it under the terms 
!of the Environment Canada - Atmospheric Science and Technology License/Disclaimer 
!version 3 or (at your option) any later version that should be found at: 
!http://collaboration.cmc.ec.gc.ca/science/rpn.comm/license.html 
!
!This software 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 above mentioned License/Disclaimer for more details.
!You should have received a copy of the License/Disclaimer along with this software; 
!if not, you can write to: EC-RPN COMM Group, 2121 TransCanada, suite 500, Dorval (Quebec), 
!CANADA, H9P 1J3; or send e-mail to service.rpn@ec.gc.ca
!-------------------------------------- LICENCE END --------------------------------------
***s/r v4d_scalpro - Compute distributed inner product <F_px,F_py> 
*
#include "model_macros_f.h"
*

      subroutine v4d_scalpro (Ndim,F_px,F_py,F_psc_8) 6,1
*
#include "impnone.cdk"
*
      integer Ndim
      real F_px(Ndim), F_py(Ndim)
      real*8 F_psc_8
*
*author
*     M.Tanguay
*
*revision
* v2_10 - Tanguay M.        - initial MPI version
* v2_21 - Desgagne M.       - rpn_comm stooge for MPI
* v2_31 - Tanguay M.        - adapt for tracers in tr3d  
* v3_03 - Tanguay M.        - Adjoint NoHyd configuration
*
*object
*     see id section
*
*arguments
*  Name        I/O                 Description
*----------------------------------------------------------------
* Ndim         I                   Dimension
* F_px         I                   Control variable 1
* F_py         I                   Control variable 2
* F_psc_8      O                   Inner product 
*----------------------------------------------------------------
*
*implicits
#include "glb_ld.cdk"
#include "lun.cdk"
#include "v4dc.cdk"
#include "tr3d.cdk"
#include "schm.cdk"
*
      integer m,ierr,i,j,k,n
      real*8 plocal_8, ZERO_8
*
      parameter( ZERO_8 = 0.0 )
*
*     Computes distributed inner product 
*     ----------------------------------
      F_psc_8  = ZERO_8 
*
      m = 0
      do k = 1,l_nk
      do j = 1,l_nj
      do i = 1,l_niu
         m = m+1
         F_psc_8  = F_psc_8  + F_px(m)*F_py(m)*V4dc_scalp(m)
      end do
      end do
      end do
*
      do k = 1,l_nk
      do j = 1,l_njv
      do i = 1,l_ni
         m = m+1
         F_psc_8  = F_psc_8  + F_px(m)*F_py(m)*V4dc_scalp(m)
      end do
      end do
      end do
*
      do k=1,l_nk
      do j=1,l_nj
      do i=1,l_ni
         m = m+1
         F_psc_8  = F_psc_8  + F_px(m)*F_py(m)*V4dc_scalp(m)
      end do
      end do
      end do
*
      do j=1,l_nj
      do i=1,l_ni
         m = m+1
         F_psc_8  = F_psc_8  + F_px(m)*F_py(m)*V4dc_scalp(m)
      end do
      end do
*
      if(.not. Schm_hydro_L) then
*
      do k=1,l_nk
      do j=1,l_nj
      do i=1,l_ni
         m = m+1
         F_psc_8  = F_psc_8  + F_px(m)*F_py(m)*V4dc_scalp(m)
      end do
      end do
      end do
*
      endif
*
      if (Tr3d_ntr.gt.0) then
         do n=1,Tr3d_ntr
            do k=1,l_nk
            do j=1,l_nj
            do i=1,l_ni
               m = m+1
               F_psc_8  = F_psc_8  + F_px(m)*F_py(m)*V4dc_scalp(m)
            end do
            end do
            end do
         end do
      endif
*     ______________________________________________________
*
      if(m.ne.Ndim) call gem_stop('v4d_scalpro',-1)
*     ______________________________________________________
*
      plocal_8 = F_psc_8
      F_psc_8  = ZERO_8
      call rpn_comm_Allreduce(plocal_8,F_psc_8,1,"MPI_DOUBLE_PRECISION",
     $                        "MPI_SUM","grid",ierr)
*
*     ---------------------------------------------------------------
*
      return
      end